CN110691667A - Manufacturing method of liquid cooling jacket - Google Patents

Abstract

A method for manufacturing a liquid cooling jacket, the liquid cooling jacket is composed of a jacket main body (2) and a closing member (3), wherein the closing member includes a hole portion (4) into which the front end of a strut (15) is inserted, and is opposite to the jacket main body. The opening part of (2) is closed, and in the manufacturing method of the liquid cooling jacket, the jacket main body (2) and the closing member (3) are joined by friction stirring, and it is characterized in that the manufacturing method of the liquid cooling jacket comprises: first In the actual joining process, insert the rotating stirring pin only into the closure (3), and in the state where only the stirring pin is in contact with the closure (3), the rotary tool is rotated one turn along the first butt joint (J1), In order to carry out friction stirring; and in the second main joining process, only the rotating stirring pin is inserted into the closure member (3), and the stirring pin is slightly in contact with the stepped side surface (17b) of the pillar stepped portion (17), Rotate the rotary tool once along the third docking portion (J3) for friction stirring.

Description

Manufacturing method of liquid cooling jacket

technical field

The present invention relates to a manufacturing method of a liquid cooling jacket.

Background technique

For example, Patent Document 1 discloses a method of manufacturing a liquid cooling jacket. 41 is a cross-sectional view showing a conventional method of manufacturing a liquid cooling jacket. In the conventional method of manufacturing a liquid cooling jacket, the butting portion J10 formed by abutting the stepped side surface 101c of the stepped portion provided in the aluminum alloy jacket body 101 with the side surface 102c of the aluminum alloy closure member 102 is performed. Friction stir joining. Moreover, in the manufacturing method of the conventional liquid cooling jacket, only the stirring pin F2 of the rotary tool F is inserted into the butt joint part J10, and friction stir welding is performed. In addition, in the manufacturing method of the conventional liquid cooling jacket, the rotation center axis C of the rotary tool F is relatively moved so as to overlap the abutting portion J10.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2015-131321

SUMMARY OF THE INVENTION

The technical problem to be solved by the invention

Here, the sleeve body 101 is prone to complex shapes such as being formed from a cast material of 4000 series aluminum alloy, while relatively simple shaped members like closure 102 are sometimes formed from a ductile material of 1000 series aluminum alloy. In this case, a liquid cooling jacket may be manufactured by joining members of different types of aluminum alloy materials to each other. In this case, since the hardness of the casing body 101 is generally higher than the hardness of the closure 102, when friction stir welding is performed as shown in FIG. 41, the stirring pin receives the material from the casing body 101 side. The resistance is greater than the material resistance experienced from the closure 102 side. Therefore, it is difficult to agitate different types of materials with a high balance by the stirring pins of the rotary tool F, and there is a problem that a void defect occurs in the plasticized region after joining, thereby reducing the joining strength.

From such a viewpoint, the technical problem of the present invention is to provide a method for manufacturing a liquid cooling jacket which can ideally join aluminum alloys having different types of materials.

Technical solutions adopted to solve technical problems

In order to solve the above technical problem, the present invention is a method for manufacturing a liquid cooling jacket, the liquid cooling jacket is composed of a jacket main body and a closure, wherein the jacket main body has a bottom and a peripheral wall standing up from the peripheral edge of the bottom a part and a post standing up from the bottom, the closure includes a hole into which the front end of the post is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid cooling jacket, The sleeve body and the closure member are joined by friction stirring, wherein the sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a hardness of In the type of material having a higher hardness than the second aluminum alloy, the outer peripheral surface of the stirring pin of the rotary tool is inclined such that the tip is tapered, and the method for manufacturing the liquid cooling jacket includes a preparation step, and in the preparation step, A peripheral wall stepped portion is formed on the inner peripheral edge of the peripheral wall portion, and the peripheral wall stepped portion has a stepped bottom surface and a stepped side surface rising obliquely from the stepped bottom surface toward the outside of the opening portion. , and a pillar stepped portion is formed at the front end of the pillar, the pillar stepped portion has a stepped bottom surface and a stepped side surface rising from the stepped bottom surface; the placing process, in the placing process, By placing the closure on the sleeve body, the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure to form a first abutting portion, and the peripheral wall stepped portion is The bottom surface of the level difference is coincident with the back side of the closure to form a second butt, and then the level side of the pillar level is butted with the hole wall of the hole of the closure to form a third butt part, and the stepped bottom surface of the pillar stepped part is overlapped with the back surface of the closure to form a fourth butt joint; in the first main joint process, only all the rotating parts are rotated. inserting the stirring pin into the closure member, and rotating the rotary tool one turn along the first abutting portion in a state in which only the stirring pin is in contact with only the closure member to perform friction stirring; and The second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the stirring pin is slightly contacted with the stepped side surface of the pillar stepped portion. In the state, the rotating tool is rotated one turn along the third abutting part to perform friction stirring.

According to the above-mentioned manufacturing method, the second aluminum alloy on the side of the main closure member in the first butt portion is agitated by frictional heat between the closure member and the stirring pin to be plastically fluidized, so that the layers can be adjusted at the first abutment portion. The differential side is engaged with the outer peripheral side of the closure. Moreover, since friction stirring is performed by bringing only the stirring pin into contact with only the closure member, the first aluminum alloy is hardly mixed into the closure member from the sleeve body. Furthermore, at the third butt portion, only the stirring pin is kept in slight contact with the step side surface. Thereby, the second aluminum alloy mainly on the closure side is friction-stirred at the first butt portion and the third butt portion, so that the reduction in the joint strength can be suppressed. Furthermore, since the stepped side surface of the sleeve body is inclined outward, the contact between the stirring pin and the sleeve body can be easily avoided without causing a decrease in the bonding strength. In addition, the strength of the liquid cooling jacket can be increased by joining the strut and the closure.

Further, in the second main joining step, it is preferable that the rotary tool is caused to follow the first step in a state in which the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion. The three butt joints are rotated once for friction stirring.

According to the above-described manufacturing method, only the stirring pin is kept in slight contact with the bottom surface of the step at the fourth abutting portion. As a result, the aluminum alloy on the closure side is mainly friction-stirred at the fourth abutting portion, thereby preventing a decrease in joint strength. In addition, by performing friction stirring on the fourth abutting portion, the joint strength can be further improved.

Further, the present invention is a method of manufacturing a liquid cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion rising from a peripheral edge of the bottom, and a peripheral wall portion rising from a peripheral edge of the bottom The bottom upright pillar, the closure includes a hole into which the front end of the pillar is inserted, and closes the opening of the jacket body, and in the method of manufacturing the liquid cooling jacket, friction stirs the The sleeve body is joined to the closure member, wherein the sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is harder than the first aluminum alloy. A kind of aluminum alloy with high hardness, the outer peripheral surface of the stirring pin of the rotary tool is inclined so that the front end is tapered, and the manufacturing method of the liquid cooling jacket includes a preparation step, in which the peripheral wall The inner peripheral edge of the portion forms a peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising obliquely from the stepped bottom surface toward the outside of the opening portion, and in the The front end of the pillar forms a pillar stepped portion, the pillar stepped portion has a stepped bottom surface and a stepped side surface rising from the stepped bottom surface; a placing step, in the placing step, by placing the The closure member is placed on the sleeve body, so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first abutting portion, and the stepped bottom surface of the peripheral wall stepped portion is made to abut Coinciding with the back of the closure to form a second butt, and then the stepped side of the strut stepped part is butted with the hole wall of the hole of the closure to form a third butt, and The stepped bottom surface of the strut stepped portion is overlapped with the back surface of the closure member to form a fourth abutting portion; a first final joining process, in which only the rotating stirring pin is inserted For the closure, in a state where the stirring pin is slightly in contact with the stepped side surface of the stepped portion of the peripheral wall, the rotating tool is rotated one turn along the first butt portion to perform friction stirring; and a second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the stirring pin is slightly contacted with the stepped side surface of the pillar stepped portion. In the state of , the rotating tool is rotated one turn along the third abutting part to perform friction stirring.

According to the above-mentioned manufacturing method, the second aluminum alloy on the side of the main closure member in the first butt portion is agitated by frictional heat between the closure member and the stirring pin to be plastically fluidized, so that the layers can be adjusted at the first abutment portion. The differential side is engaged with the outer peripheral side of the closure. In addition, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the sleeve body, the mixing of the first aluminum alloy from the sleeve body into the closure can be reduced as much as possible. In addition, the stirring pin is kept in slight contact with the step side surface also at the third abutting portion, so that the mixing of the first aluminum alloy from the sleeve body to the closure can be reduced as much as possible. Thereby, the second aluminum alloy mainly on the closure side is friction-stirred at the first butt portion and the third butt portion, so that the reduction in the joint strength can be suppressed. In addition, since the stepped side surface of the cover body is inclined outward, the first abutting portion can be joined without greatly entering the side of the cover body with the stirring pin. In addition, the strength of the liquid cooling jacket can be increased by joining the strut and the closure.

Further, in the first main joining step, it is preferable that the rotary tool is caused to follow the first step in a state where the stirring pin is slightly in contact with the stepped bottom surface of the peripheral wall stepped portion. A pair of the butt joints is rotated once for friction stirring.

According to the above-described manufacturing method, at the second butt portion, only the stirring pin is kept in slight contact with the bottom surface of the step. As a result, the second aluminum alloy on the side of the closure is mainly friction-stirred at the second abutting portion, thereby preventing a decrease in joint strength. In addition, by performing friction stirring also on the second butting portion, the joint strength can be further improved.

Further, in the second main joining step, it is preferable that the rotary tool is caused to follow the first step in a state in which the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion. The three butt joints are rotated once for friction stirring.

According to the above-described manufacturing method, only the stirring pin is kept in slight contact with the bottom surface of the step at the fourth abutting portion. Thereby, the second aluminum alloy on the closure side is mainly friction-stirred at the fourth abutting portion, so that the reduction of the joint strength can be prevented. In addition, by performing friction stirring on the fourth abutting portion, the joint strength can be further improved.

In addition, it is preferable that, in the preparation process, the cover body is formed by casting, the bottom portion is formed so as to protrude toward the front side, and the closure member is formed so as to protrude toward the front side.

Heat shrinkage occurs in the plasticized region due to the heat input of friction stir welding, so that the closure side of the liquid cooling jacket may be deformed in a concave manner. And flatten the liquid cooling jacket by utilizing heat shrinkage.

In addition, it is preferable to measure the deformation amount of the sleeve main body in advance, and in the first final joining step and the second final joining step, the stirring pins of the rotating tool are adjusted according to the deformation amount. The insertion depth was adjusted while friction stirring was performed.

According to the above manufacturing method, even when the jacket body and the closure are convexly bent and friction stir welding is performed, the length and width of the plasticized region formed on the liquid cooling jacket can be made constant.

In addition, it is preferable to include a provisional bonding step before the first main bonding step and the second main bonding step, and in the provisional bonding step, the first butting portion and the third facing portion are preferably connected to each other. At least one of them is temporarily joined.

According to the above-described manufacturing method, by performing the temporary bonding, it is possible to prevent the cracking of the respective butted portions in the first main joining step and the second main joining step.

In addition, it is preferable that in the first main joining step and the second main joining step, a cooling plate through which a cooling medium flows is provided on the back side of the bottom portion, and the cooling plate is passed through the cooling plate. The sleeve body and the closure are cooled while friction stirring is performed.

According to the above-described manufacturing method, the frictional heat can be kept low, so that deformation of the liquid cooling jacket due to thermal shrinkage can be reduced.

Moreover, it is preferable to make the front surface of the said cooling plate and the back surface of the said bottom contact. According to the above-mentioned manufacturing method, the cooling efficiency can be improved.

Moreover, it is preferable that the said cooling plate has a cooling flow path in which the said cooling medium flows, and the said cooling flow path has a planar shape along the movement locus of the said rotary tool in the said 1st main joining process.

According to the above-mentioned production method, since the friction-stirred portion can be concentratedly cooled, the cooling efficiency can be further improved.

Moreover, it is preferable that the cooling flow path in which the said cooling medium flows is comprised by the cooling pipe embedded in the said cooling plate. According to the above-described manufacturing method, the management of the cooling medium can be easily performed.

Further, in the first main joining step and the second main joining step, it is preferable that the cooling medium flows in the hollow portion formed by the jacket main body and the closure member, and the cooling medium is directed to the The jacket body and the closure are cooled while friction stirring is performed.

According to the above-described manufacturing method, the frictional heat can be kept low, so that deformation of the liquid cooling jacket due to thermal shrinkage can be reduced. In addition, cooling can be performed by the jacket body itself without using a cooling plate or the like.

In order to solve the above technical problem, the present invention is a method for manufacturing a liquid cooling jacket, the liquid cooling jacket is composed of a jacket main body and a closure, wherein the jacket main body has a bottom and a peripheral wall standing up from the peripheral edge of the bottom A part and a post standing up from the bottom, the closure forms a hole into which the front end of the post is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid cooling jacket, The sleeve body and the closure member are joined by friction stirring, wherein the sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a hardness of For a material type having a higher hardness than the second aluminum alloy, an outer peripheral surface of a stirring pin of a rotary tool used in friction stirring is inclined so that the tip is tapered, and the method for manufacturing the liquid cooling jacket includes a preparation step, wherein In the preparation step, a peripheral wall stepped portion is formed on an inner peripheral edge of the peripheral wall portion, the peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening, and A pillar stepped portion having a stepped bottom surface and a stepped side surface rising obliquely from the stepped bottom surface so that the front end of the strut is tapered is formed at the front end of the pillar, and then the pillar stepped portion is formed. The plate thickness of the closing member is set to be larger than the height dimension of the stepped side surface of the pillar stepped portion; a placing step, in the placing step, by placing the closing member on the sleeve body, so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure to form a first abutting portion, and the stepped bottom surface of the peripheral wall stepped portion and the closure The back surfaces of the pillars are overlapped to form a second butt portion, and a third abutment portion is formed in such a way that there is a gap when the stepped side surface of the pillar stepped portion is butted against the hole wall of the hole portion, and the pillar stepped portion is made to have a gap. The stepped bottom surface of the part overlaps with the back surface of the closure to form a fourth butting part; and a second final joining process in which only the rotating stirring pin is inserted into the closure while moving the rotary tool along the third abutting portion in a state in which the outer peripheral surface of the stirring pin does not contact the stepped side surface of the strut stepped portion, the first The di-aluminum alloy flows into the gap while friction stirring is performed.

According to the above manufacturing method, the second aluminum alloy on the main closure side in the third abutting portion is agitated by the frictional heat between the closure member and the stirring pin to be plastically fluidized, so that the strut can be spun at the third abutting portion. The stepped side surface of the stepped portion is joined to the hole wall of the hole portion. In addition, since only the stirring pin is brought into contact with the closure to perform friction stirring, the first aluminum alloy is hardly mixed into the closure from the sleeve body. As a result, the second aluminum alloy on the closure side is mainly friction-stirred at the third abutting portion, so that the reduction in the joint strength can be suppressed. In addition, by increasing the plate thickness of the closure, it is possible to prevent the metal shortage of the joining portion in the second main joining step.

Further, in the second main joining step, it is preferable that the rotary tool is caused to follow the first step in a state in which the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion. The three butt joints move for friction stirring. According to the above-described manufacturing method, the fourth abutting portion can be firmly joined, and the watertightness and airtightness can be improved.

Further, the present invention is a method of manufacturing a liquid cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion rising from a peripheral edge of the bottom, and a peripheral wall portion rising from a peripheral edge of the bottom The bottom of the column stands upright, the closure forms a hole into which the front end of the column is inserted, and closes the opening of the jacket body, and in the method of manufacturing the liquid cooling jacket, friction stirring The sleeve body is joined to the closure member, wherein the sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is harder than the first aluminum alloy. A kind of aluminum alloy with high hardness, the outer peripheral surface of the stirring pin of the rotating tool used in friction stirring is inclined so that the tip is tapered, and the method for manufacturing the liquid cooling jacket includes: a preparation step, in the preparation step wherein, a peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening portion is formed on the inner peripheral edge of the peripheral wall portion, and a stepped portion is formed on the support column. The front ends of the pillars form a pillar stepped portion having a stepped bottom surface and a stepped side surface rising obliquely from the stepped bottom surface so that the front ends of the pillars are tapered, and then the closed The plate thickness of the member is set to be larger than the height dimension of the step side surface of the step portion of the pillar; a placing step, in the placing step, the closure member is placed on the sleeve body by placing the closure member. , so that the stepped side surface of the peripheral wall stepped portion is butted with the outer peripheral side surface of the closure to form a first butt portion, and the stepped bottom surface of the peripheral wall stepped portion and the back of the closure are overlapped to form a first butt joint. A second abutting portion is formed, a third abutting portion is formed so that a gap exists when the stepped side surface of the pillar stepped portion is butted against the hole wall of the hole portion, and the step of the pillar stepped portion is The bottom surface coincides with the back surface of the closure member to form a fourth butting portion; and a second final joining process in which only the rotating stirring pin is inserted into the closure member, and the When the rotary tool is moved along the third abutting portion in a state where the outer peripheral surface of the stirring pin is slightly in contact with the stepped side surface of the strut stepped portion, the second aluminum alloy of the closure member is allowed to flow in. Friction stirring is performed while the gap is present.

According to the above manufacturing method, the second aluminum alloy on the main closure side in the third abutting portion is agitated by the frictional heat between the closure member and the stirring pin to be plastically fluidized, so that the strut can be spun at the third abutting portion. The stepped side surface of the stepped portion is joined to the hole wall of the hole portion. In addition, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the strut stepped portion, the mixing of the first aluminum alloy from the sleeve body into the closure can be reduced as much as possible. As a result, the second aluminum alloy on the closure side is mainly friction-stirred at the third abutting portion, so that the reduction in the joint strength can be suppressed. In addition, by increasing the plate thickness of the closure, it is possible to prevent the metal shortage of the joining portion in the second main joining step.

Further, in the second main joining step, it is preferable that the rotary tool is caused to follow the first step in a state in which the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion. The three butt joints move for friction stirring. According to the above-described manufacturing method, the fourth abutting portion can be firmly joined.

In addition, it is preferable to perform a first main joining step in which the rotary tool is moved along the first butting portion and rotated once around the opening portion to perform Friction stirring.

According to the above manufacturing method, the watertightness and airtightness of the liquid cooling jacket can be improved.

In order to solve the above technical problem, the present invention is a method for manufacturing a liquid cooling jacket, the liquid cooling jacket is composed of a jacket main body and a closure, wherein the jacket main body has a bottom and a peripheral wall standing up from the peripheral edge of the bottom a part and a post standing up from the bottom, the closure includes a hole into which the front end of the post is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid cooling jacket, The sleeve body and the closure member are joined by friction stirring, wherein the sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a hardness of In the type of material having a higher hardness than the second aluminum alloy, the outer peripheral surface of the stirring pin of the rotary tool is inclined so that the front end thereof is tapered, the front end side of the stirring pin is formed with a flat surface, and the flat surface includes a protrusion. The protruding portion of the liquid cooling jacket, the method of manufacturing the liquid cooling jacket includes: a preparation process, in which a peripheral wall stepped portion is formed on the inner peripheral edge of the peripheral wall portion, and the peripheral wall stepped portion has a stepped bottom surface and a bottom surface from the bottom surface. The stepped bottom surface faces the stepped side surface rising from the opening, and a strut stepped portion is formed at the front end of the strut, and the strut stepped portion has a stepped bottom surface and a stepped bottom surface that rises from the stepped bottom surface. A stepped side surface; a placing step in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the closure member are butt to form a first butt part, and make the stepped bottom surface of the peripheral wall stepped part coincide with the back of the closure to form a second butt part, and then make the stepped side of the pillar stepped part meet the The hole walls of the hole portion of the closure are butted to form a third butt, and the stepped bottom surface of the strut stepped portion is overlapped with the back of the closure to form a fourth butt; and a second formal joint step, in the second main joining step, inserting only the rotating stirring pin into the closure, and making the outer peripheral surface of the stirring pin and the stepped side surface of the pillar stepped portion not in contact with each other. The rotating tool is moved along the third abutting portion to perform friction stirring in a state in which the protruding portion of the stirring pin is in contact with the stepped bottom surface of the strut stepped portion.

According to the above manufacturing method, the second aluminum alloy on the main closure side in the third abutting portion is agitated by the frictional heat between the closure member and the stirring pin to be plastically fluidized, so that the strut can be spun at the third abutting portion. The stepped side surface of the stepped portion is joined to the hole wall of the hole portion. In addition, friction stirring is performed by bringing only the outer peripheral surface of the stirring pin into contact with only the closure, so that the first aluminum alloy is hardly mixed into the closure from the sleeve body. In addition, the plastic flow material that is friction-stirred along the protrusion of the stirring pin and rolled up by the protrusion is pressed by the flat surface of the stirring pin. Thereby, friction stirring can be reliably performed around the protruding portion, and since the oxide film of the fourth abutting portion is reliably cut off, the bonding strength of the fourth abutting portion can be improved.

In addition, it is preferable that in the second main joining step, the rotary tool is next made to be in a state in which the flat surface of the stirring pin and the stepped bottom surface of the strut stepped portion are not in contact with each other. Move along the third abutment for friction stirring.

According to the above-described manufacturing method, the mixing of the first aluminum alloy from the sleeve body into the closure can be further reduced, and therefore, the reduction in the bonding strength can be effectively suppressed. In addition, since the width of the plasticized region is reduced, the plastic flow material can be prevented from flowing out from the fourth abutting portion, and the stepped bottom surface of the strut stepped portion can be set small.

Further, the present invention is a method of manufacturing a liquid cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion rising from a peripheral edge of the bottom, and a peripheral wall portion rising from a peripheral edge of the bottom The bottom upright pillar, the closure includes a hole into which the front end of the pillar is inserted, and closes the opening of the jacket body, and in the method of manufacturing the liquid cooling jacket, friction stirs the The sleeve body is joined to the closure member, wherein the sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is harder than the first aluminum alloy. A kind of aluminum alloy with high hardness, the outer peripheral surface of the stirring pin of the rotary tool is inclined so that the front end is tapered, the front end side of the stirring pin is formed with a flat surface, and the flat surface includes a protruding protrusion, The method for manufacturing the liquid cooling jacket includes a preparation step in which a peripheral wall stepped portion is formed on the inner peripheral edge of the peripheral wall portion, the peripheral wall stepped portion having a stepped bottom surface and a bottom surface from the stepped portion. a stepped side surface whose bottom surface faces the opening, and a strut stepped portion is formed at the front end of the strut, the strut stepped portion has a stepped bottom surface and a stepped side surface erected from the stepped bottom surface; A placing process in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first step. a butt portion, and the stepped bottom surface of the peripheral wall stepped portion is overlapped with the back surface of the closure to form a second butted portion, and then the stepped side surface of the pillar stepped portion is made to coincide with all the closed parts. The hole walls of the hole parts are butted to form a third butt joint, and the stepped bottom surface of the pillar stepped part is overlapped with the back surface of the closure to form a fourth butt joint; In the second main joining step, only the rotating stirring pin is inserted into the closure, and the stirring pin is made to slightly contact the outer peripheral surface of the stirring pin with the stepped side surface of the pillar stepped portion. The rotating tool is moved along the third abutting portion to perform friction stirring in a state where the protruding portion is in contact with the stepped bottom surface of the pillar stepped portion.

According to the above manufacturing method, the second aluminum alloy on the main closure side in the third abutting portion is agitated by the frictional heat between the closure member and the stirring pin to be plastically fluidized, so that the strut can be spun at the third abutting portion. The stepped side surface of the stepped portion is joined to the hole wall of the hole portion. In addition, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the strut stepped portion, the mixing of the first aluminum alloy from the sleeve body into the closure can be reduced as much as possible. As a result, the second aluminum alloy on the closure side is mainly friction-stirred at the third abutting portion, so that the reduction in the joint strength can be suppressed. In addition, the plastic flow material that is friction-stirred along the protrusion of the stirring pin and rolled up by the protrusion is pressed by the flat surface of the stirring pin. Thereby, friction stirring can be performed more reliably around the projection part, and since the oxide film of the fourth abutting part is reliably cut, the bonding strength of the fourth butting part can be improved.

In addition, it is preferable that in the second main joining step, the rotary tool is next made to be in a state in which the flat surface of the stirring pin and the stepped bottom surface of the strut stepped portion are not in contact with each other. Move along the third abutment for friction stirring.

According to the above-described manufacturing method, the mixing of the first aluminum alloy from the sleeve body into the closure can be further reduced, so that the reduction in the bonding strength can be effectively suppressed. In addition, since the width of the plasticized region is reduced, the plastic flow material can be prevented from flowing out from the fourth abutting portion, and the stepped bottom surface of the strut stepped portion can be set small.

Furthermore, it is preferable that the manufacturing method of the liquid cooling jacket includes a first main joining step in which the rotary tool is moved along the first abutting portion and goes around the The opening is rotated once to perform friction stirring.

According to the above manufacturing method, the watertightness and airtightness of the liquid cooling jacket can be improved.

Invention effect

According to the manufacturing method of the liquid cooling jacket of the present invention, aluminum alloys having different types of materials can be joined desirably.

Description of drawings

1 is a perspective view showing a preparation process of a method for manufacturing a liquid cooling jacket according to a first embodiment of the present invention.

2 is a cross-sectional view showing a mounting step of the method of manufacturing the liquid cooling jacket according to the first embodiment.

3 is a perspective view showing a first main joining step of the method of manufacturing the liquid cooling jacket according to the first embodiment.

4 is a cross-sectional view showing a first main joining step of the method of manufacturing the liquid cooling jacket according to the first embodiment.

5 is a cross-sectional view after a first main joining step of the method of manufacturing the liquid cooling jacket according to the first embodiment.

6 is a perspective view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the first embodiment.

7 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the first embodiment.

8 is a cross-sectional view showing a mounting step of a method of manufacturing a liquid cooling jacket according to a first modification of the first embodiment.

9 is a cross-sectional view showing a mounting step of a method of manufacturing a liquid cooling jacket according to a second modification of the first embodiment.

10 is a cross-sectional view showing a first main joining step of a method of manufacturing a liquid cooling jacket according to a second embodiment of the present invention.

11 is a cross-sectional view showing a first main joining step of a method for manufacturing a liquid cooling jacket according to a third embodiment of the present invention.

12 is a cross-sectional view showing a first main joining step of a method of manufacturing a liquid cooling jacket according to a fourth embodiment of the present invention.

13 is a cross-sectional view showing a first main joining step of a method of manufacturing a liquid cooling jacket according to a first modification of the fourth embodiment.

14 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the fifth embodiment of the present invention.

15 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the first modification of the fifth embodiment.

16 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the sixth embodiment of the present invention.

17 is a perspective view showing a third modification of the method of manufacturing the liquid cooling jacket according to the first embodiment.

18A is a perspective view of a table showing a fourth modification of the method of manufacturing the liquid cooling jacket of the first embodiment.

18B is a perspective view showing a state in which the jacket main body and the closure are fixed to the table in the fourth modification of the method of manufacturing the liquid cooling jacket according to the first embodiment.

19 is an exploded perspective view showing a fifth modification of the method of manufacturing the liquid cooling jacket according to the first embodiment.

20 is a perspective view showing a state in which the jacket main body and the closure of the fifth modification of the liquid cooling jacket manufacturing method according to the first embodiment are fixed to the table.

21 is a perspective view showing a preparation process of a method of manufacturing a liquid cooling jacket according to a seventh embodiment of the present invention.

22 is a cross-sectional view showing a mounting step of a method of manufacturing a liquid cooling jacket according to a seventh embodiment.

23 is a perspective view showing a first main joining step of the method of manufacturing the liquid cooling jacket according to the seventh embodiment.

24 is a cross-sectional view showing a first main joining step of the method of manufacturing the liquid cooling jacket according to the seventh embodiment.

25 is a cross-sectional view after the first main joining step of the method of manufacturing the liquid cooling jacket according to the seventh embodiment.

26 is a perspective view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the seventh embodiment.

27 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the seventh embodiment of the present invention.

28 is a cross-sectional view showing a first main joining step of a method of manufacturing a liquid cooling jacket according to an eighth embodiment of the present invention.

29 is a cross-sectional view showing a first main joining step of a method of manufacturing a liquid cooling jacket according to a ninth embodiment of the present invention.

30 is a cross-sectional view showing a first main joining step of a method of manufacturing a liquid cooling jacket according to a tenth embodiment of the present invention.

31 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the eleventh embodiment of the present invention.

32 is a perspective view showing a preparation process of a method of manufacturing a liquid cooling jacket according to a twelfth embodiment of the present invention.

33 is a cross-sectional view showing a mounting step of a method of manufacturing a liquid cooling jacket according to a twelfth embodiment.

34 is a perspective view showing a first main joining step of the method of manufacturing the liquid cooling jacket according to the twelfth embodiment.

35 is a cross-sectional view showing a first main joining step of the method of manufacturing the liquid cooling jacket according to the twelfth embodiment.

36 is a cross-sectional view after the first main joining step of the method for manufacturing the liquid cooling jacket according to the twelfth embodiment.

37 is a perspective view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the twelfth embodiment.

38 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the twelfth embodiment of the present invention.

39 is a cross-sectional view showing a first main joining step of a method of manufacturing a liquid cooling jacket according to a thirteenth embodiment of the present invention.

40 is a cross-sectional view showing a second main joining step of the method of manufacturing the liquid cooling jacket according to the fourteenth embodiment of the present invention.

41 is a cross-sectional view showing a conventional method of manufacturing a liquid cooling jacket.

Detailed ways

[First Embodiment]

A method of manufacturing a liquid cooling jacket according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1 , the liquid cooling jacket 1 is manufactured by friction stir welding of the jacket main body 2 and the closure member 3 . The liquid cooling jacket 1 is a member in which a heat generating body (not shown) is provided on the closure 3, and a fluid flows inside to exchange heat with the heat generating body. In addition, the "front surface" in the following description means the surface on the opposite side to "back surface".

In the manufacturing method of the liquid cooling jacket of the present embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. The preparation process is a process of preparing the cover body 2 and the closure member 3 . The sleeve body 2 is mainly composed of a bottom portion 10 , a peripheral wall portion 11 and a plurality of pillars 15 . The sleeve body 2 is formed to mainly contain the first aluminum alloy. As the first aluminum alloy, an aluminum alloy casting material such as JISH5302ADC12 (Al—Si—Cu series) is used.

As shown in FIG. 1 , the bottom portion 10 is a rectangular plate-like member in plan view. The peripheral wall portion 11 is a wall portion standing up in a rectangular frame shape from the peripheral edge portion of the bottom portion 10 . A peripheral wall stepped portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11 . The peripheral wall stepped portion 12 is constituted by a stepped bottom surface 12a and a stepped side surface 12b rising from the stepped bottom surface 12a. As shown in FIG. 2, the stepped side surface 12b is inclined so as to spread outward from the stepped bottom surface 12a toward the opening. The inclination angle β of the stepped side surface 12b may be appropriately set, and is, for example, 3° to 30° with respect to the plumb surface. The recessed portion 13 is formed by the bottom portion 10 and the peripheral wall portion 11 .

As shown in FIG. 1 , the pillars 15 stand vertically from the base 10 . The number of the struts 15 is not limited, but four are formed in this embodiment. In addition, although the shape of the pillar 15 is cylindrical in this embodiment, other shapes may be used. A protruding portion 16 is formed at the front end of the strut 15 . The shape of the protruding portion 16 is not limited, but is cylindrical in this embodiment. The height of the protrusion 16 is the same as the plate thickness of the closure 3 . The strut stepped portion 17 is formed by the end surface of the strut 15 and the protruding portion 16 . The pillar stepped portion 17 is constituted by a stepped bottom surface 17a and a stepped side surface 17b rising from the stepped bottom surface 17a. The stepped bottom surface 17 a is formed at the same height position as the stepped bottom surface 12 a of the peripheral wall stepped portion 12 .

The closure 3 is a plate-shaped member that seals the opening of the cover body 2 . The closure 3 has a size to be placed on the peripheral wall stepped portion 12 . The plate thickness of the closure member 3 is substantially the same as the height of the step side surface 12b. Holes 4 are formed at positions of the closure 3 corresponding to the pillars 15 . The hole portion 4 is formed so that the protruding portion 16 is fitted with almost no gap. The closure 3 is formed to mainly contain the second aluminum alloy. The second aluminum alloy is a material having a hardness lower than that of the first aluminum alloy. The second aluminum alloy is formed of, for example, an aluminum alloy ductile material such as JISA1050, A1100, and A6063.

As shown in FIG. 2 , the placing step is a step of placing the closure 3 on the sleeve body 2 . In the placing step, the back surface 3b of the closure 3 is placed on the stepped bottom surface 12a. The stepped side surface 12b is abutted with the outer peripheral side surface 3c of the closure member 3 to form a first butt joint J1. The first abutting portion J1 includes both the case where the stepped side surface 12b is in surface contact with the outer peripheral side surface 3c of the closure 3 and the case where they are butted with a gap having a substantially V-shaped cross section as in the present embodiment. Further, the stepped bottom surface 12a is abutted with the back surface 3b of the closure member 3 to form a second abutment portion J2. In this embodiment, when the closure 3 is placed, the end surface 11 a of the peripheral wall portion 11 is coplanar with the front surface 3 a of the closure 3 .

In addition, the hole wall 4a of the hole portion 4 is abutted against the stepped side surface 17b of the pillar stepped portion 17 through the placing step, to form the third abutting portion J3. Further, the back surface 3b of the closure member 3 is abutted with the stepped bottom surface 17a of the pillar stepped portion 17 to form a fourth butted portion J4.

As shown in FIGS. 3 and 4 , the first main welding process is a process of friction stir welding the first butt joint J1 using the rotary tool F. As shown in FIG. The rotary tool F is composed of the connecting portion F1 and the stirring pin F2. The rotary tool F is formed of, for example, tool steel. The connection part F1 is a part connected with the rotating shaft of a friction stirrer (illustration omitted). The connection portion F1 has a columnar shape, and a screw hole (not shown) for fastening a bolt is formed.

The stirring pin F2 hangs down from the connection part F1, and is coaxial with the connection part F1. The tip of the stirring pin F2 is gradually tapered as it moves away from the connecting portion F1. As shown in FIG. 4, the flat surface F3 which is perpendicular to the rotation center axis C and is flat is formed at the tip of the stirring pin F2. That is, the outer surface of the stirring pin F2 is comprised by the outer peripheral surface of the tapered front end, and the flat surface F3 formed in the front end. When viewed from the side, the inclination angle α formed by the rotation center axis C and the outer peripheral surface of the stirring pin F2 may be appropriately set, for example, within a range of 5° to 30°, but it is set in this embodiment. It is the same as the inclination angle β of the stepped side surface 12 b of the peripheral wall stepped portion 12 .

A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In this embodiment, since the rotary tool F is rotated rightward, the helical groove is formed so as to turn leftward as it goes from the base end to the distal end. In other words, the spiral groove is formed so as to turn leftward when viewed from above when the spiral groove is drawn from the base end toward the front end.

In addition, when rotating the rotary tool F to the left, it is preferable that the spiral groove is formed so as to be wound to the right as it goes from the base end to the distal end. In other words, the helical groove at this time is formed so that when the helical groove is drawn from the base end toward the front end, the helical groove is wound rightward when viewed from above. By setting the spiral groove as described above, the plastically fluidized metal is guided toward the front end side of the stirring pin F2 by the spiral groove when friction stirring is performed. Thereby, the amount of metal overflowing to the outside of the metal members to be joined (the cover body 2 and the closure 3 ) can be reduced.

As shown in FIG. 3 , when friction stirring is performed using the rotary tool F, only the stirring pin F2 rotated to the right is inserted into the closure 3, and the stirring pin F2 is moved while separating the closure 3 from the connecting portion F1. . In other words, friction stirring is performed in a state where the proximal end portion of the stirring pin F2 is exposed. A plasticized region W1 is formed in the movement locus of the rotary tool F by the solidification of the metal after friction stirring. In the present embodiment, the stirring pin F2 is inserted at the start position Sp set to the closure 3, and the rotary tool F is relatively moved to the right with respect to the closure 3.

As shown in FIG. 4 , in the first main joining process, only the stirring pin F2 is brought into contact with only the closure 3 and rotated once along the first butting portion J1. In the present embodiment, the insertion depth is set so that the flat surface F3 of the stirring pin F2 does not come into contact with the case body 2 either. "The state in which only the stirring pin F2 is brought into contact with only the closure 3" refers to a state in which the outer surface of the stirring pin F2 does not contact the casing body 2 during friction stirring, and can include the outer peripheral surface and the layer of the stirring pin F2 The case where the distance of the difference side surface 12b is zero, or the case where the distance between the flat surface F3 of the stirring pin F2 and the step bottom surface 12a is zero.

If the distance from the stepped side surface 12b to the outer peripheral surface of the stirring pin F2 is too long, the joint strength of the first butt joint portion J1 will decrease. The separation distance L from the stepped side surface 12b to the outer peripheral surface of the stirring pin F2 may be appropriately set according to the materials of the sleeve body 2 and the closure 3, but it is preferable to make the outer peripheral surface of the stirring pin F2 as in the present embodiment. When the flat surface F3 is not in contact with the stepped side surface 12b and the flat surface F3 is not in contact with the stepped bottom surface 12a, for example, 0≤L≤0.5 mm, more preferably 0≤L≤0.3 mm.

After the rotary tool F is rotated around the closure 3 once, the start and end of the plasticized region W1 are made to coincide. The rotary tool F can also be pulled up gradually in the front surface 3 a of the closure 3 . FIG. 5 is a cross-sectional view of the joined portion after the main joining process of the present embodiment. The plasticized region W1 is formed on the side of the closure member 3 with the first abutting portion J1 as a boundary. Further, the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a (see FIG. 4 ), and the plasticized region W1 is formed so as to extend beyond the second abutting portion J2 and reach the sleeve body 2 .

As shown in FIGS. 6 and 7 , the second main welding step is a step of friction stir welding the third facing portion J3 using the rotary tool F. As shown in FIGS. As shown in FIG. 6 , in the second main joining step, only the stirring pin F2 rotated to the right is inserted into the start position Sp set on the front surface 3a of the closure 3, and the closure 3 is separated from the connection portion F1 while the closure 3 is separated. While moving the stirring pin F2. In other words, friction stirring is performed in a state where the proximal end portion of the stirring pin F2 is exposed. A plasticized region W2 is formed on the starting trajectory of the rotary tool F by the solidification of the metal after friction stirring.

As shown in FIG. 7 , in the second main joining step, in a state where the outer peripheral surface of the stirring pin F2 is slightly in contact with the stepped side surface 17b (protruding portion 16 ) of the pillar stepped portion 17 , the rotary tool F is moved along the first The three docking parts J3 move relatively. After the rotary tool F is rotated around the protruding portion 16 once, the start end and the end end of the plasticized region W2 are made to overlap. Although the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 17a, the plasticized region W2 is formed so as to reach the fourth abutting portion J4.

According to the manufacturing method of the liquid cooling jacket of the present embodiment described above, the stirring pin F2 of the rotary tool F does not contact the stepped side surface 12b of the peripheral wall stepped portion 12, but the frictional heat between the closure 3 and the stirring pin F2 does not come into contact with each other. The second aluminum alloy on the side of the main closure member 3 in the first butt joint J1 is stirred to be plastically fluidized, so that the stepped side surface 12b and the outer peripheral side surface 3c of the closure member 3 can be joined at the first butt joint portion J1. . In addition, since only the stirring pin F2 is brought into contact with only the closure 3 to perform friction stirring, the first aluminum alloy is hardly mixed into the closure 3 from the sleeve body 2 . As a result, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the first butt joint portion J1, and therefore, the reduction of the joint strength can be suppressed.

Further, in the first main joining step, the stepped side surface 12b of the sleeve body 2 is inclined outward, so that the contact between the stirring pin F2 and the sleeve body 2 can be easily avoided. In addition, in the present embodiment, since the inclination angle β of the stepped side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), it is possible to avoid the stirring pin F2 The stirring pin F2 is brought as close as possible to the step side surface 12b while being in contact with the step side surface 12b.

In addition, in the first main welding step, friction stir welding is performed by bringing only the stirring pin F2 into contact with only the closure member 3, so that the material resistance received by the stirring pin F2 can be eliminated at one part of the rotation center axis C of the stirring pin F2. Unbalance at one side and the other. Thereby, since the plastic flow material is friction-stirred with a high balance, it is possible to suppress a decrease in the bonding strength.

In addition, in the first main joining step, the rotation direction and the advancing direction of the rotary tool F may be appropriately set, but the rotation direction and the advancing direction of the rotary tool F are set so that the movement locus formed in the rotary tool F may be In the plasticized region W1, the side of the sleeve body 2 becomes the shear side, and the side of the closure member 3 becomes the flow side. By setting the side of the sleeve body 2 to be the shearing side, the stirring action of the stirring pin F2 around the first butting portion J1 is increased, the temperature at the first butting portion J1 can be expected to rise, and the The step side surface 12b and the outer peripheral side surface 3c of the closure member 3 are joined more reliably at the first butt joint portion J1.

In addition, the advancing side (Advancing side) refers to a value obtained by adding the magnitude of the moving speed to the magnitude of the tangential velocity at the periphery of the rotating tool and the relative speed of the outer periphery of the rotary tool with respect to the engaged portion. side. On the other hand, the flow side (Retreating side) refers to the side where the relative speed of the rotating tool with respect to the engaged portion is lowered by rotating the rotating tool in the opposite direction to the moving direction of the rotating tool.

Furthermore, the first aluminum alloy of the sleeve body 2 is a material having a higher hardness than that of the second aluminum alloy of the closure 3 . Thereby, the durability of the liquid cooling jacket 1 can be improved. In addition, preferably, the first aluminum alloy of the sleeve body 2 is an aluminum alloy casting material, and the second aluminum alloy of the closure 3 is an aluminum alloy ductile material. By making the first aluminum alloy an Al—Si—Cu series aluminum alloy casting material such as JISH5302ADC12, the castability, strength, machinability, and the like of the sleeve body 2 can be improved. Moreover, by making the second aluminum alloy into, for example, the JISA1000 series or the A6000 series, workability and thermal conductivity can be improved.

In addition, in the present embodiment, the flat surface F3 of the stirring pin F2 is not inserted deeper than the step bottom surface 12a at the first butt joint J1, but since the plasticized region W1 reaches the second butt joint J2, the Can improve bonding strength.

Further, at the third abutting portion J3 , only the stirring pin F2 is kept slightly in contact with the stepped side surface 17 b (the protruding portion 16 ) of the pillar stepped portion 17 . Thereby, at the third butt joint J3, the first aluminum alloy can be prevented from being mixed into the closure 3 from the strut 15 of the casing body 2 as much as possible, and the second aluminum alloy on the side of the closure 3 is mainly friction-stirred. Therefore, the decrease in bonding strength can be suppressed. In addition, the strength of the liquid cooling jacket can be improved by joining the struts 15 to the closure member 3 .

In addition, any one of the first main joining step and the second main joining step may be performed first. Further, before the first main joining step and the second main joining step, at least one of the first butt joint part J1 and the third butt joint part J3 may be temporarily joined by friction stirring or welding. By performing the temporary joining, the first butt joint part J1 and the third butt joint part J3 can be prevented from cracking in the first main joint process or the second main joint process.

[First Variation]

Next, a first modification of the first embodiment will be described. As in the first modification shown in FIG. 8 , the plate thickness of the closure 3 may be set larger than the height dimension of the stepped side surface 12 b of the peripheral wall stepped portion 12 . Since the first abutting portion J1 is formed to have a gap, there is a possibility that a metal shortage may occur at the junction portion, but the metal shortage can be compensated for by setting in the manner of the first modification.

[Second modification example]

Next, a second modification of the first embodiment will be described. The inclined surface may be provided so as to incline the outer peripheral side surface 3c of the closure 3 as in the second modification shown in FIG. 9 . The outer peripheral side surface 3c is inclined outward as it goes from the back surface 3b to the front surface 3a. The inclination angle γ of the outer peripheral side surface 3c is the same as the inclination angle β of the stepped side surface 12b. Thereby, in the mounting process, the stepped side surface 12b is brought into surface contact with the outer peripheral side surface 3c of the closure member 3 . According to the second modification, since there is no gap in the first butt joint portion J1, the metal shortage in the joint portion can be compensated.

[Second Embodiment]

Next, a method of manufacturing the liquid cooling jacket according to the second embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket according to the second embodiment, a preparation step, a mounting step, a first primary joining step, and a second primary joining step are performed. In the second embodiment, the preparation process, the placing process, and the second main joining process are the same as those in the first embodiment, and therefore, descriptions are omitted. In addition, in 2nd Embodiment, the part different from 1st Embodiment is demonstrated mainly.

As shown in FIG. 10 , the first main welding step is a step of friction stir welding the first butt joint J1 using the rotary tool F. As shown in FIG. In the main joining process, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface of the stirring pin F2 is slightly contacted with the stepped side surface 12b of the peripheral wall stepped portion 12 and the flat surface F3 is not in contact with the layer. The friction stir welding is performed so that the bottom surface 12a is in contact with each other.

Here, let the amount of contact between the outer peripheral surface of the stirring pin F2 and the step side surface 12b be the offset amount N. When the outer peripheral surface of the stirring pin F2 is brought into contact with the stepped side surface 12b and the flat surface F3 of the stirring pin F2 is not brought into contact with the stepped bottom surface 12a as in the present embodiment, the offset amount N is set to 0<N ≤0.5mm, more preferably set between 0<N≤0.25mm.

In the conventional liquid cooling jacket manufacturing method shown in FIG. 41 , the hardness of the jacket body 101 and the closure member 102 are different, so the material resistance received by the stirring pin F2 is between one side sandwiching the rotation center axis C and the other side. There is a big difference on one side. Therefore, the plastic flow material is not stirred with a high balance, and thus, it becomes a factor of lowering the bonding strength. However, according to the present embodiment, the contact amount between the outer peripheral surface of the stirring pin F2 and the case main body 2 is reduced as much as possible, so that the material resistance received by the stirring pin F2 from the case main body 2 can be reduced as much as possible. In addition, in the present embodiment, the inclination angle β of the stepped side surface 12b of the peripheral wall stepped portion 12 is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), therefore, The amount of contact between the stirring pin F2 and the step side surface 12b can be made uniform in the height direction. Thereby, in this embodiment, since the plastic flow material is stirred with a high balance, it is possible to suppress a decrease in the strength of the joint portion.

In addition, in the second embodiment, as in the first modification and the second modification of the first embodiment, the plate thickness of the closure 3 may be increased, or an inclined surface may be provided on the side surface. In addition, in the second main joining step, the fifth embodiment, the first modification of the fifth embodiment, or the sixth embodiment, which will be described later, may be applied.

[Third Embodiment]

Next, a method for manufacturing the liquid cooling jacket according to the third embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket according to the third embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. In the third embodiment, the preparation process, the placing process, and the second main bonding process are the same as those in the first embodiment, and therefore the description is omitted. In addition, in 3rd Embodiment, the part different from 1st Embodiment is demonstrated mainly.

As shown in FIG. 11 , the first main welding step is a step of friction stir welding the sleeve body 2 and the closure 3 using the rotary tool F. As shown in FIG. In the main joining step, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface of the stirring pin F2 is not in contact with the step side surface 12b and the flat surface F3 is inserted deeper than the step bottom surface 12a state for friction stir welding.

According to the manufacturing method of the liquid cooling jacket of the present embodiment, the stirring pin F2 does not contact the stepped side surface 12b of the peripheral wall stepped portion 12, but the frictional heat between the closure member 3 and the stirring pin F2 causes contact with the first butting portion J1 by frictional heat. The second aluminum alloy on the side of the main closure 3 is agitated to plastically fluidize, so that the stepped side surface 12b and the outer peripheral side surface 3c of the closure 3 can be joined at the first butt joint J1. Moreover, since friction stirring is performed by bringing only the stirring pin F2 into contact with only the closure 3 at the first butt joint J1, the first aluminum alloy is hardly mixed into the closure 3 from the casing body 2. As a result, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the first butt joint portion J1, and therefore, the reduction of the joint strength can be suppressed.

Moreover, since the step side surface 12b of the sleeve main body 2 is inclined outward, the contact between the stirring pin F2 and the step side surface 12b can be easily avoided. In addition, in the present embodiment, the inclination angle β of the stepped side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), so that the stirring pin F2 and the stirring pin F2 can be avoided. The step side surface 12b is brought into contact, and at the same time, the stirring pin F2 can be brought as close as possible to the step side surface 12b.

In addition, the friction stir welding is performed by separating the outer peripheral surface of the stirring pin F2 from the step side surface 12b, so that the material resistance received by the stirring pin F2 can be reduced on one side and the other side of the rotation center axis C of the stirring pin F2 imbalance at the place. Thereby, since the plastic flow material is friction-stirred with a high balance, it is possible to suppress a decrease in the bonding strength. Preferably, as in the present embodiment, when the outer peripheral surface of the stirring pin F2 does not come into contact with the step side surface 12b and the flat surface F3 is inserted deeper than the step bottom surface 12a, the outer peripheral surface of the stirring pin F2 is inserted from the step side surface 12b to the step side surface 12b. The separation distance L of the outer peripheral surface of the stirring pin F2 is set to, for example, 0≦L≦0.5 mm, and more preferably 0≦L≦0.3 mm.

Moreover, by inserting the flat surface F3 of the stirring pin F2 into the step bottom surface 12a, the friction stirring of the lower part of a junction part can be performed more reliably. Thereby, generation of void defects and the like in the plasticized region W1 can be prevented, and the bonding strength can be improved. Moreover, the whole surface of the flat surface F3 of the stirring pin F2 is located in the center side of the closure member 3 rather than the outer peripheral side surface 3c of the closure member 3. As shown in FIG. Thereby, since the joining area of the 2nd abutting part J2 can be enlarged, the joining strength can be improved.

In addition, in the third embodiment, as in the first modification and the second modification of the first embodiment, the plate thickness of the closure 3 may be increased, or an inclined surface may be provided on the outer peripheral side surface. In addition, in the second main joining step, the fifth embodiment, the first modification of the fifth embodiment, or the sixth embodiment, which will be described later, may be applied.

[Fourth Embodiment]

Next, a method of manufacturing a liquid cooling jacket according to a fourth embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket according to the fourth embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. In the fourth embodiment, the preparation process, the placing process, and the second main joining process are the same as those in the first embodiment, and therefore the description is omitted. In addition, in 4th Embodiment, the part different from 3rd Embodiment is demonstrated mainly.

As shown in FIG. 12 , the first main welding step is a step of friction stir welding the first butt joint J1 using the rotary tool F. As shown in FIG. In the main joining process, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface of the stirring pin F2 is slightly contacted with the stepped side surface 12b of the peripheral wall stepped portion 12, and the flat surface F3 is inserted so that the The friction stir welding is performed so as to be deeper than the step bottom surface 12a.

Here, let the amount of contact between the outer peripheral surface of the stirring pin F2 and the step side surface 12b be the offset amount N. When the flat surface F3 of the stirring pin F2 is inserted deeper than the stepped bottom surface 12a of the peripheral wall stepped portion 12 as in the present embodiment, and the outer peripheral surface of the stirring pin F2 is brought into contact with the stepped side surface 12b, the offset The amount N is set between 0<N≦1.0 mm, preferably 0<N≦0.85 mm, more preferably 0<N≦0.65 mm.

In the conventional liquid cooling jacket manufacturing method shown in FIG. 41 , the hardness of the jacket body 101 and the closure member 102 are different, so the material resistance received by the stirring pin F2 is between one side sandwiching the rotation center axis C and the other side. There is also a big difference on one side. Therefore, the plastic flow material is not stirred with a high balance, and thus, it becomes a factor of lowering the bonding strength. However, according to the present embodiment, the contact amount between the outer peripheral surface of the stirring pin F2 and the case main body 2 is reduced as much as possible, so that the material resistance received by the stirring pin F2 from the case main body 2 can be reduced as much as possible. In addition, in the present embodiment, since the inclination angle β of the stepped side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), the stirring pin F2 and the stirring pin F2 can be made parallel to each other. The contact amount of the step side surface 12b is uniform in the height direction. Thereby, in this embodiment, since the plastic flow material is stirred with a high balance, it is possible to suppress a decrease in the strength of the joint portion.

Moreover, by inserting the flat surface F3 of the stirring pin F2 into the step bottom surface 12a, the friction stirring of the lower part of a junction part can be performed more reliably. Thereby, generation of void defects and the like in the plasticized region W1 can be prevented, and the bonding strength can be improved. That is, both the first abutting portion J1 and the second abutting portion J2 can be firmly joined.

In addition, in the fourth embodiment, as in the first modification and the second modification of the first embodiment, the plate thickness of the closure 3 may be increased, or an inclined surface may be provided on the side surface. In addition, in the second main joining step, the fifth embodiment, the first modification of the fifth embodiment, or the sixth embodiment, which will be described later, may be applied.

[First modification of the fourth embodiment]

Next, a first modification of the fourth embodiment will be described. As shown in FIG. 13 , in this first modification, the point of using the rotary tool FA is different from the fourth embodiment. In the present modification, the description will center on the parts different from those of the fourth embodiment.

The rotary tool FA used in the main joining process contains the connection part F1 and the stirring pin F2. The stirring pin F2 is comprised by the flat surface F3 and the protrusion part F4. The protruding portion F4 is a portion protruding downward from the flat surface F3. The shape of the protruding portion F4 is not limited, but is cylindrical in this embodiment. The stepped portion is formed by the side surface of the protruding portion F4 and the flat surface F3.

In the main joining process of this 1st modification, the front-end|tip of the rotary tool FA is inserted deeper than the step bottom surface 12a. Thereby, the plastic flow material which is friction-stirred along the protrusion part F4 and rolled up by the protrusion part F4 is pressed by the flat surface F3. Thereby, friction stirring can be performed more reliably around the protrusion part F4, and the oxide film of the 2nd abutting part J2 can be cut|disconnected reliably. Thereby, the joining strength of the 2nd abutting part J2 can be improved. In addition, by setting only the projection portion F4 to be inserted deeper than the second abutting portion J2 as in the present modification, the plasticity can be reduced compared to the case where the flat surface F3 is inserted deeper than the second abutting portion J2 The width of the ization region W1. Thereby, the plastic flow material can be prevented from flowing out to the recessed part 13, and the width|variety of the step bottom surface 12a can be set small.

In addition, in the first modification of the fourth embodiment shown in FIG. 13 , the projection part F4 (the front end of the stirring pin F2 ) is set to be inserted deeper than the second abutting part J2 , but it may be set to be flat. The face F3 is inserted deeper than the second abutting portion J2.

[Fifth Embodiment]

Next, the manufacturing method of the liquid cooling jacket of the fifth embodiment will be described. In the manufacturing method of the liquid cooling jacket according to the fifth embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. In the fifth embodiment, the preparation process, the placing process, and the first main joining process are the same as those in the first embodiment, and therefore the description is omitted. In addition, in the fifth embodiment, the description will center on the difference from the first embodiment.

As shown in FIG. 14 , in the second main joining step, the rotating tool F is rotated once around the third abutting portion J3 to perform friction stirring without contacting the support 15 and the protruding portion 16 with the rotating tool F. engage. In the second main welding step, although friction stir welding is performed without the stirring pin F2 and any of the stepped side surface 17b and the stepped bottom surface 17a of the pillar stepped portion 17, the friction stir welding is performed, but the The insertion depth is set so that the plasticized region W2 reaches the fourth abutting portion J4. That is, the fourth abutting portion J4 is plastically fluidized by the frictional heat of the stirring pin F2 and the closure member 3 to join them. In addition, the insertion depth may be set so that the stirring pin F2 comes into contact with the stepped bottom surface 17a of the strut stepped portion 17 .

[First modification of the fifth embodiment]

Next, a method of manufacturing the liquid cooling jacket according to the first modification of the fifth embodiment will be described. In the manufacturing method of the liquid cooling jacket according to the first modification of the fifth embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. The present modification is different from the fifth embodiment in that the rotary tool FA is used in the second main joining step.

As shown in FIG. 15 , in the second main joining step, the rotary tool FA is rotated once around the third abutting portion J3 without contacting the stepped side surface 17b (protruding portion 16 ) so as to Friction stir welding is performed. In the second final joining step, the distal end of the rotary tool FA is inserted deeper than the stepped bottom surface 17 a of the pillar stepped portion 17 . Thereby, the plastic flow material which is friction-stirred along the protrusion part F4 and rolled up by the protrusion part F4 is pressed by the flat surface F3. Thereby, friction stirring can be performed more reliably around the protrusion part F4, and the oxide film of the 4th abutting part J4 can be cut|disconnected reliably. Thereby, the joining strength of the 4th abutting part J4 can be improved. In addition, by setting only the projection portion F4 to be inserted deeper than the fourth abutting portion J4 as in the present modification, the plasticity can be reduced compared to the case where the flat surface F3 is inserted deeper than the fourth abutting portion J4 The width of the ization area W2. Thereby, the plastic flow material can be prevented from flowing out to the recessed portion 13, and the width of the stepped bottom surface 17a of the strut stepped portion 17 can be set small.

In addition, in the first modification of the fifth embodiment shown in FIG. 15 , the projection part F4 (the front end of the stirring pin F2 ) is set to be inserted deeper than the fourth abutting part J4 , but it may be set to be flat. The face F3 is inserted deeper than the fourth butt J4.

[Sixth Embodiment]

Next, a method of manufacturing the liquid cooling jacket according to the sixth embodiment will be described. In the manufacturing method of the liquid cooling jacket according to the sixth embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. In the sixth embodiment, the preparation process, the placing process, and the first main joining process are the same as those in the first embodiment, and therefore the description is omitted.

As shown in FIG. 16 , in the second main welding step, friction stir welding is performed on the third facing portion J3 in a state in which the rotary tool F is inclined outward with respect to the protruding portion 16 . In the second main welding step, friction stir welding is performed in a state in which the rotation center axis C of the rotary tool F is inclined outward by an angle α with respect to the protruding portion 16 . Thereby, the outer peripheral surface of the stirring pin F2 is parallel to the stepped side surface 17b of the pillar stepped portion 17 . The step side surface 17b may be separated from the stirring pin F2, or both may be slightly contacted.

In the manufacturing method of the liquid cooling jacket according to the sixth embodiment, since friction stirring can be performed in a state where the outer peripheral surface of the stirring pin F2 is parallel to the stepped side surface 17b, it is possible to make the stepped side surface 17b and the stirring pin F2 The rotary tool F and the protruding portion 16 are brought as close to each other as possible while the outer peripheral surfaces of the two are separated. Thereby, the first aluminum alloy can be prevented from being mixed from the casing body 2 side to the closure 3 side, and the joint strength can be improved. On the other hand, when the stepped side surface 17b is slightly in contact with the stirring pin F2, the first aluminum alloy can be prevented from entering from the casing body 2 side to the closure 3 side as much as possible, and the stepped side surface 17b can be brought into contact with the closure member 3 as much as possible. The stirring pins F2 are uniformly contacted in the height direction. In addition, the stirring pin F2 may be brought into contact with the step bottom surface 17a.

[Third modification of the first embodiment]

Next, a method of manufacturing a liquid cooling jacket according to a third modification of the first embodiment will be described. As shown in FIG. 17 , the third modification is different from the first embodiment in that the temporary bonding step, the first main bonding step, and the second main bonding step are performed using a cooling plate. In the third modification of the first embodiment, the description will be focused on the parts different from those of the first embodiment.

As shown in FIG. 17 , in the third modification of the first embodiment, the cover main body 2 is fixed to the table K during the fixing step. The table K is composed of a rectangular parallelepiped substrate K1 , clips K3 formed at four corners of the substrate K1 , and cooling pipes WP arranged inside the substrate K1 . The table K restricts the cover main body 2 so as not to move, and is a member that functions as a "cooling plate" in the claims.

The cooling pipe WP is a tubular member embedded in the substrate K1. A cooling medium for cooling the substrate K1 flows through the cooling pipe WP. The arrangement position of the cooling pipe WP, that is, the shape of the cooling flow path through which the cooling medium flows, is not particularly limited, but in the third modification example, it follows the movement trajectory of the rotary tool F in the first main joining step. flat shape. That is, the cooling pipe WP is arrange|positioned so that the cooling pipe WP may substantially overlap with the 1st abutting part J1 in planar view.

In the temporary joining process, the first main joining process, and the second main joining process of the third modification, after the jacket body 2 is fixed to the table K, friction stirring is performed while the cooling medium flows in the cooling pipe WP. engage. Thereby, the frictional heat at the time of friction stirring can be suppressed low, and therefore the deformation of the liquid cooling jacket 1 due to thermal contraction can be reduced. In addition, in the third modification example, the cooling flow path overlaps with the first abutting portion J1 (movement locus of the temporary joining rotary tool and the rotary tool F) in plan view, and therefore, the portion where frictional heat is generated can be concentrated. Cool down. Thereby, cooling efficiency can be improved. Furthermore, since the cooling pipe WP is arranged to circulate the cooling medium, management of the cooling medium is facilitated. In addition, since the table K (cooling plate) is in surface contact with the jacket body 2, the cooling efficiency can be improved.

Alternatively, the jacket body 2 and the closure 3 may be cooled using the table K (cooling plate), and friction stir welding may be performed while the cooling medium flows inside the jacket body 2 .

[Fourth modification of the first embodiment]

Next, a method of manufacturing a liquid cooling jacket according to a fourth modification of the first embodiment will be described. As shown in FIGS. 18A and 18B , in the fourth modification of the first embodiment, the first main joining step and the The second main bonding step is different from the first embodiment in that point. In the present fourth modification, the description will center on the parts different from those of the first embodiment.

As shown in FIGS. 18A and 18B , in this fourth modification, a table KA is used. The table KA is composed of a rectangular parallelepiped substrate KA1, a spacer KA2 formed at the center of the substrate KA1, and clips KA3 formed at four corners of the substrate KA1. The spacer KA2 may be integrated with the substrate KA1, or may be separate.

In the fixing process of this fourth modification, the sleeve main body 2 and the closure 3 integrated by the temporary joining process are fixed to the table KA by the clip KA3. The plasticized region W is formed by the temporary bonding process. As shown in FIG. 18A , when the cover body 2 and the closure 3 are fixed to the table KA, the bottom 10 of the cover body 2 , the end surface 11 a and the front surface 3 a of the closure 3 are curved upwardly convexly. More specifically, the first side portion 21 of the wall portion 11A, the second side portion 22 of the wall portion 11B, the third side portion 23 of the wall portion 11C, and the fourth side portion 24 of the wall portion 11D of the case body 2 are formed in a The way the curve bends.

In the first final joining step and the second final joining step of the fourth modification, the friction stir welding is performed using the rotary tool F. In the first final joining step and the second final joining step, the amount of deformation of at least one of the sleeve body 2 and the closure 3 is measured in advance, and friction is performed while adjusting the insertion depth of the stirring pin F2 according to the amount of deformation. Stir to join. That is, it moves along the curved surface of the end surface 11a of the sleeve main body 2 and the front surface 3a of the closure member 3 so that the movement locus of the rotary tool F becomes a curve. In this way, the depth and width of the plasticized regions W1 and W2 can be made constant.

Due to the heat input of friction stir welding, thermal shrinkage occurs in the plasticizing regions W1 and W2, so that the closing member 3 side of the liquid cooling jacket 1 may be deformed into a concave shape. However, according to the first main welding process and In the second main bonding step, the jacket body 2 and the closure member 3 are fixed in a convex shape in advance so that tensile stress acts on the end face 11a and the front face 3a. Therefore, the liquid cooling jacket 1 can be formed by thermal shrinkage after friction stir welding. flat. In addition, in the case of performing the main joining process with the conventional rotary tool, if the sleeve main body 2 and the closure member 3 are warped into a convex shape, the shoulder portion of the rotary tool will contact the sleeve main body 2 and the closure member 3, so that there is an operation problem. Sexual issues. However, according to this fourth modification, the rotary tool F does not have a shoulder, so even when the sleeve body 2 and the closure 3 are warped in a convex shape, the operability of the rotary tool F is good.

In addition, about the measurement of the deformation|transformation amount of the cover main body 2 and the closure 3, a well-known height detection apparatus should just be used. In addition, for example, a friction stirrer equipped with a detection device may be used to perform the first main joining step and the second final joining step while detecting the deformation amount of the sleeve body 2 or the closure member 3. The height of the stage KA to at least any one of the sleeve body 2 and the closure 3 is detected.

In addition, in this fourth modification, the cover body 2 and the closure 3 are bent so that all the first side portions 21 to the fourth side portions 24 are curved, but the present invention is not limited to this. For example, the cover body 2 and the closure 3 may be curved so that the first side portion 21 and the second side portion 22 are straight and the third side portion 23 and the fourth side portion 24 are curved. In addition, for example, the cover body 2 and the closure 3 may be curved so that the first side portion 21 and the second side portion 22 are curved, and the third side portion 23 and the fourth side portion 24 are linear.

In addition, in this fourth modification, the height position of the stirring pin F2 is changed according to the deformation amount of the sleeve body 2 or the closure 3, but the height of the stirring pin F2 with respect to the table KA may be fixed, and the main joining process may be performed. .

In addition, the spacer KA2 may be any shape as long as it can be fixed so that the front side of the cover body 2 and the closure 3 can be convex. In addition, the spacer KA2 may be omitted as long as the cover body 2 and the closure 3 can be fixed so that the front sides thereof are convex. In addition, the rotary tool F may be attached to, for example, a robot arm provided with a rotation drive mechanism such as a spindle unit at the tip. According to the above configuration, the rotation center axis of the rotary tool F can be easily changed at various angles.

[Fifth modification of the first embodiment]

Next, a method of manufacturing a liquid cooling jacket according to a fifth modification of the first embodiment will be described. As shown in FIG. 19 , in the fifth modification of the first embodiment, in the preparation process, the cover body 2 and the closure 3 are formed to be convexly curved toward the front side in advance, which is different from the first embodiment. different. In the fifth modification of the first embodiment, the description will center on the difference from the first embodiment.

In the preparation process of the fifth modification of the first embodiment, the cover main body 2 and the front side of the closure 3 are formed by a mold so that the front sides thereof are convexly curved. Thereby, the cover main body 2 is formed so that the bottom part 10 and the peripheral wall part 11 respectively have convex shapes on the front side. In addition, the front surface 3a of the closure 3 is formed in a convex shape.

As shown in FIG. 20 , in the fifth modification, when the fixing process is performed, the temporarily joined cover body 2 and the closure 3 are fixed to the table KB. The table KB is composed of a rectangular parallelepiped substrate KB1, spacers KB2 disposed at the center of the substrate KB1, clips KB3 formed at four corners of the substrate KB1, and cooling pipes WP embedded in the substrate KB1. The table KB restrains the jacket main body 2 so as not to move, and is a member that functions as a "cooling plate" in the claims.

The spacer KB2 is composed of a curved surface KB2a that is convexly curved upward, and vertical surfaces KB2b and KB2b formed at both ends of the curved surface KB2a and standing up from the substrate KB1. The first side portion Ka and the second side portion Kb of the spacer KB2 are curved, and the third side portion Kc and the fourth side portion Kd are straight lines.

The cooling pipe WP is a tubular member embedded in the substrate KB1. A cooling medium for cooling the substrate KB1 flows through the cooling pipe WP. The arrangement position of the cooling pipe WP, that is, the shape of the cooling flow path through which the cooling medium flows, is not particularly limited, but in the fifth modification example, it follows the movement locus of the rotary tool F in the first main joining step. flat shape. That is, the cooling pipe WP is arrange|positioned so that the cooling pipe WP may substantially overlap with the 1st abutting part J1 in planar view.

In the fixing process of this fifth modification, the sleeve body 2 and the closure 3 that have been temporarily joined and integrated are fixed to the table KB by the clip KB3. More specifically, it is fixed to the table KB so that the back surface of the bottom part 10 of the cover main body 2 is brought into surface contact with the curved surface KB2a. When the cover body 2 is fixed to the table KB, the first side portion 21 of the wall portion 11A of the cover body 2 and the second side portion 22 of the wall portion 11B are curved, and the third side portion of the wall portion 11C is 23 and the fourth side portion 24 of the wall portion 11D are curved so as to be straight.

In the first final joining step and the second final joining step of the fifth modification, the friction stir welding is performed on the first butt joint J1 and the second butt joint J2 using the rotary tool F, respectively. In the first main joining step and the second main joining step, the amount of deformation of at least one of the sleeve body 2 and the closure 3 is measured in advance, and friction stirring is performed while adjusting the insertion depth of the stirring pin F2 according to the amount of deformation. engage. That is, the rotary tool F is moved along the end face 11 a of the sleeve body 2 and the front face 3 a of the closure 3 so that the movement trajectory of the rotary tool F is curved or straight. In this way, the depth and width of the plasticized region W1 can be made constant.

Due to the heat input of friction stir welding, thermal shrinkage occurs in the plasticizing regions W1 and W2, so that the closing member 3 side of the liquid cooling jacket 1 may be deformed into a concave shape. However, according to the first main welding process and In the second main bonding step, the jacket body 2 and the closure member 3 are formed in a convex shape in advance, so that the liquid cooling jacket 1 can be made flat by utilizing thermal shrinkage after friction stir welding.

Further, in the fifth modification example, the curved surface KB2 a of the spacer KB2 is brought into contact with the concave rear surface of the bottom portion 10 of the case body 2 . Thereby, friction stir welding can be performed while cooling the jacket main body 2 and the closure 3 more efficiently. Since the frictional heat in the friction stir welding can be suppressed low, the deformation of the liquid cooling jacket due to thermal shrinkage can be reduced. Accordingly, in the preparation process, when the case body 2 and the closure 3 are formed into convex shapes, the curvature of the case body 2 and the closure 3 can be reduced.

In addition, about the measurement of the deformation|transformation amount of the cover main body 2 and the closure 3, a well-known height detection apparatus should just be used. In addition, for example, a friction stirrer equipped with a detection device may be used to perform the main joining process while detecting the deformation amount of the sleeve body 2 or the closure member 3. The detection device can detect the deformation of the sleeve body 2 and the closure member 3 from the table KB to the sleeve body 2 and the closure. The height of at least any one of the pieces 3 is detected.

In addition, in the fifth modification example, the cover body 2 and the closure 3 are curved so that the first side portion 21 and the second side portion 22 are curved, but the present invention is not limited to this. For example, the spacer KB2 having a spherical surface may be formed, and the back surface of the bottom portion 10 of the case body 2 may be brought into surface contact with the spherical surface. In the above-mentioned case, when the cover body 2 is fixed to the table KB, the first side portion 21 to the fourth side portion 24 are all curved.

In addition, in this fifth modification, the height position of the stirring pin F2 is changed according to the deformation amount of the sleeve body 2 or the closure 3, but the height of the stirring pin F2 with respect to the table KB may be constant, and the main joining process may be performed. .

[Seventh Embodiment]

A method of manufacturing a liquid cooling jacket according to a seventh embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 21, in the manufacturing method of the liquid cooling jacket of the present embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. The preparation process is a process of preparing the cover body 2 and the closure member 3 . The sleeve body 2 is mainly composed of a bottom portion 10 , a peripheral wall portion 11 and a plurality of pillars 15 .

As shown in FIG. 21 , the bottom portion 10 is a rectangular plate-like member in plan view. The peripheral wall portion 11 is a wall portion standing up in a rectangular frame shape from the peripheral edge portion of the bottom portion 10 . A peripheral wall stepped portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11 . The peripheral wall stepped portion 12 is constituted by a stepped bottom surface 12a and a stepped side surface 12b rising from the stepped bottom surface 12a. As shown in FIG. 22 , the stepped side surface 12b is inclined so as to expand outward from the stepped bottom surface 12a toward the opening. The inclination angle β of the stepped side surface 12b may be appropriately set, and is, for example, 3° to 30° with respect to the plumb surface. The recessed portion 13 is formed by the bottom portion 10 and the peripheral wall portion 11 .

As shown in FIG. 21 , the pillars 15 stand vertically from the bottom 10 . The number of the struts 15 is not limited, but four are formed in this embodiment. In addition, although the shape of the support|pillar 15 is a cylindrical shape in this embodiment, another shape may be sufficient. A protruding portion 16 is formed at the front end of the strut 15 . The shape of the protruding portion 16 is not limited, but is in the shape of a truncated cone in this embodiment. The height of the protrusion 16 is smaller than the plate thickness of the closure 3 . The strut stepped portion 17 is formed by the end surface of the strut 15 and the protruding portion 16 . The pillar stepped portion 17 is constituted by a stepped bottom surface 17a and a stepped side surface 17b rising from the stepped bottom surface 17a. The stepped bottom surface 17 a is formed at the same height position as the stepped bottom surface 12 a of the peripheral wall stepped portion 12 . The stepped side surface 17b is smaller than the plate thickness of the closure member 3 . The stepped side surface 17b is inclined so as to be separated from the hole wall 4a as it goes toward the front end.

The closure 3 is a plate-shaped member that closes the opening of the cover body 2 . The closure 3 has a size to be placed on the peripheral wall stepped portion 12 . The plate thickness of the closure member 3 is larger than the height of the step side surface 12b. Holes 4 are formed at positions of the closure 3 corresponding to the pillars 15 . The hole portion 4 is formed so that the protruding portion 16 is fitted. The closure 3 is formed to mainly contain the second aluminum alloy. The second aluminum alloy is a material having a hardness lower than that of the first aluminum alloy. The second aluminum alloy is formed of, for example, an aluminum alloy ductile material such as JISA1050, A1100, and A6063.

As shown in FIG. 22 , the placing step is a step of placing the closure 3 on the case body 2 . In the placing step, the back surface 3b of the closure 3 is placed on the stepped bottom surface 12a. The stepped side surface 12b is abutted with the outer peripheral side surface 3c of the closure member 3 to form a first butt joint J1. Further, the stepped bottom surface 12a is abutted with the back surface 3b of the closure member 3 to form a second abutment portion J2.

In addition, the hole wall 4a of the hole portion 4 is abutted against the stepped side surface 17b of the pillar stepped portion 17 through the placing step, to form the third abutting portion J3. The third abutting portion J3 includes both the case where the hole wall 4a is in surface contact with the stepped side surface 17b of the pillar stepped portion 17 and the case where the hole wall 4a is in surface contact with the stepped side surface 17b of the pillar stepped portion 17 and the case where the third abutting portion J3 is butted with a gap having a substantially V-shaped cross section as in the present embodiment. . Further, the back surface 3b of the closure member 3 is abutted with the stepped bottom surface 17a of the pillar stepped portion 17 to form a fourth butted portion J4. In addition, in the present embodiment, the protruding portion 16 is formed so that the tip is tapered, but it may be formed in a columnar shape. That is, the stepped side surface 17b of the pillar stepped portion 17 may be in surface contact with the hole wall 4a of the hole portion 4, or the stepped side surface 17b of the pillar stepped portion 17 may be spaced from the hole wall 4a of the hole portion 4. Open a small gap relative to each other.

As shown in FIGS. 23 and 24 , the first main welding step is a step of performing friction stir welding on the first butt joint J1 using the rotary tool F. As shown in FIGS.

As shown in FIG. 24 , in the first main joining step, while the plastically fluidized metal flows into the gap of the first butt joint J1 , only the stirring pin F2 is brought into contact with only the closure 3 along the first butt joint J1 . Rotate once.

After the rotary tool F is rotated around the closure 3 once, the start and end of the plasticized region W1 are made to coincide. The rotary tool F can also be pulled up gradually in the front surface 3 a of the closure 3 . FIG. 25 is a cross-sectional view of the joined portion after the main joining process of the present embodiment. The plasticized region W1 is formed on the side of the closure member 3 with the first abutting portion J1 as a boundary. Further, the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a (see FIG. 24 ), and the plasticized region W1 is formed so as to extend beyond the second abutting portion J2 and reach the sleeve body 2 .

As shown in FIGS. 26 and 27 , the second main welding step is a step of friction stir welding the third facing portion J3 using the rotary tool F. As shown in FIG. 26 , in the second main joining process, only the stirring pin F2 rotated to the right is inserted into the start position Sp set on the front surface 3a of the closure 3, and the closure 3 is separated from the connection portion F1 while the closure 3 is separated. While moving the stirring pin F2. In other words, friction stirring is performed in a state where the proximal end portion of the stirring pin F2 is exposed. A plasticized region W2 is formed in the movement locus of the rotary tool F by the metal solidification after friction stirring.

As shown in FIG. 27 , in the second main joining step, while the plastically fluidized metal flows into the gap of the third butt joint J3, only the stirring pin F2 is brought into contact with only the closure 3 and along the third joint part J3 Rotate once. In the present embodiment, the outer peripheral surface F10 of the stirring pin F2 is not in contact with the stepped side surface 17b of the pillar stepped portion 17, and the flat surface F3 of the stirring pin F2 is not in contact with the stepped bottom surface 17a. The separation distance between the step side surface 17b and the outer peripheral surface F10 of the stirring pin F2 is the same as that in the first main joining process. After the rotary tool F is rotated around the protruding portion 16 once, the start end and the end end of the plasticized region W2 are made to overlap. The rotary tool F can also be pulled up gradually in the front surface 3 a of the closure 3 .

According to the manufacturing method of the liquid cooling jacket of the present embodiment described above, the stirring pin F2 of the rotary tool F does not contact the stepped side surface 12b of the peripheral wall stepped portion 12, but the frictional heat between the closure 3 and the stirring pin F2 does not come into contact with each other. The second aluminum alloy on the side of the main closure member 3 in the first butt joint J1 is stirred to be plastically fluidized, so that the stepped side surface 12b and the outer peripheral side surface 3c of the closure member 3 can be joined at the first butt joint portion J1. . In addition, in both the first main joining step and the second main joining step, only the stirring pin F2 is brought into contact with only the closure 3 to perform friction stirring, so that the first aluminum alloy is hardly mixed into the closure 3 from the sleeve body 2 . . Thereby, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the first butt joint portion J1 and the third butt joint portion J3, so that the reduction in the joint strength can be suppressed.

In addition, in the present embodiment, a V-shaped gap in cross section is formed in the first butt joint part J1 and the third butt joint part J3. However, by making the plate thickness of the closure 3 larger than the stepped side surfaces 12b and 17b, it is possible to prevent the The metal in the joints (plasticized regions W1 and W2 ) in the first main joining step and the second main joining step is insufficient.

Further, in the first main joining step, the stepped side surface 12b of the sleeve body 2 is inclined outward, so that the contact between the stirring pin F2 and the sleeve body 2 can be easily avoided. In addition, in the present embodiment, since the inclination angle β of the stepped side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), it is possible to avoid the stirring pin While F2 is in contact with the stepped side surface 12b, the stirring pin F2 is brought as close as possible to the stepped side surface 12b.

In addition, in the second main joining step, the stepped side surface 17b of the pillar stepped portion 17 is inclined in a direction away from the hole wall 4a (so as to make the front end of the pillar 15 thinner) as it goes toward the front end, so that The contact of the stirring pin F2 with the sleeve body 2 can be easily avoided. In addition, in the present embodiment, since the inclination angle γ of the stepped side surface 17b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 17b is made parallel to the outer peripheral surface F10 of the stirring pin F2), it is possible to avoid the stirring pin The stirring pin F2 is brought as close as possible to the step side surface 17b while the F2 is in contact with the step side surface 17b.

In addition, in the first main joining step and the second main joining step, friction stir welding is performed by bringing only the stirring pin F2 into contact with only the closure member 3, so that the material resistance received by the stirring pin F2 can be eliminated from the friction stir welding of the stirring pin F2. Unbalance at one side and the other side of the central axis of rotation C. Thereby, since the plastic flow material is friction-stirred with a high balance, it is possible to suppress a decrease in the bonding strength.

In addition, in the first main joining step, the rotation direction and the advancing direction of the rotary tool F may be appropriately set, but the rotation direction and the advancing direction of the rotary tool F are set so that the movement locus formed in the rotary tool F may be In the plasticized region W1, the side of the sleeve body 2 becomes the shear side, and the side of the closure member 3 becomes the flow side. In addition, by setting the side of the sleeve body 2 to be the shearing side, the stirring action of the stirring pin F2 around the first butting portion J1 is increased, the temperature at the first butting portion J1 can be expected to rise, and the The stepped side surface 12b and the outer peripheral side surface 3c of the closure 3 can be joined more reliably at the first butt joint portion J1.

In addition, in the same manner, in the second main joining step, by setting the side of the strut (the sleeve body 2 ) to be the shearing side, the stirring action of the stirring pin F2 around the third abutting portion J3 is increased. , the temperature rise at the third abutting portion J3 can be expected, and the step side surface 17b and the hole wall 4a of the hole portion 4 can be more reliably joined at the third abutting portion J3.

Furthermore, the first aluminum alloy of the sleeve body 2 is a material having a higher hardness than that of the second aluminum alloy of the closure 3 . Thereby, the durability of the liquid cooling jacket 1 can be improved. In addition, preferably, the first aluminum alloy of the sleeve body 2 is an aluminum alloy casting material, and the second aluminum alloy of the closure 3 is an aluminum alloy ductile material. By making the first aluminum alloy an Al—Si—Cu series aluminum alloy casting material such as JISH5302ADC12, the castability, strength, machinability, and the like of the sleeve body 2 can be improved. Moreover, by making the second aluminum alloy into, for example, the JISA1000 series or the A6000 series, workability and thermal conductivity can be improved.

In addition, in the present embodiment, although the flat surface F3 of the stirring pin F2 is not inserted deeper than the step bottom surface 12a at the second butting portion J2, the plasticized region W1 reaches the second abutting portion J2, so that the Can improve bonding strength.

In addition, any one of the first main joining step and the second main joining step may be performed first. Further, before the first main joining step and the second main joining step, at least one of the first butt joint part J1 and the third butt joint part J3 may be temporarily joined by friction stirring or welding. By performing the temporary joining, the first butt joint part J1 and the third butt joint part J3 can be prevented from cracking in the first main joint process or the second main joint process.

In addition, in the second main joining process shown in FIG. 27 , the outer peripheral surface F10 of the stirring pin F2 may not be in contact with the stepped side surface 17b, and the level difference between the flat surface F3 of the stirring pin F2 and the pillar stepped portion 17 may be made. The bottom surface 17a is in contact (slightly in contact). In this way, the fourth abutting portion J4 can be firmly joined. In addition, the stepped side surface 12b may be formed perpendicular to the stepped bottom surface 12a without being inclined.

[Eighth Embodiment]

Next, a method of manufacturing a liquid cooling jacket according to an eighth embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket of the eighth embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. In the eighth embodiment, the preparation process, the placing process, and the second main joining process are the same as those in the seventh embodiment, and therefore the description is omitted. In addition, in the eighth embodiment, the description will center on the parts different from those of the seventh embodiment.

As shown in FIG. 28 , the first main welding step is a step of friction stir welding the first butt joint J1 using the rotary tool F. As shown in FIG. In the main joining process, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface F10 of the stirring pin F2 is slightly contacted with the stepped side surface 12b of the peripheral wall stepped portion 12 and the flat surface F3 is not in contact with each other. The friction stir welding is performed so that the stepped bottom surfaces 12a are in contact with each other.

Here, let the amount of contact between the outer peripheral surface F10 of the stirring pin F2 and the step side surface 12b be the offset amount N. When the outer peripheral surface F10 of the stirring pin F2 is brought into contact with the stepped side surface 12b and the flat surface F3 of the stirring pin F2 is not brought into contact with the stepped bottom surface 12a as in the present embodiment, the offset amount N is set to 0< Between N≤0.5mm, it is more preferable to set between 0<N≤0.25mm.

In the conventional liquid cooling jacket manufacturing method shown in FIG. 41 , the hardness of the jacket body 101 and the closure member 102 are different, so the material resistance received by the stirring pin F2 is between one side sandwiching the rotation center axis C and the other side. There is also a big difference on one side. Therefore, the plastic flow material is not stirred with a high balance, and thus, it becomes a factor of lowering the bonding strength. However, according to the present embodiment, the contact amount between the outer peripheral surface F10 of the stirring pin F2 and the sleeve body 2 is reduced as much as possible, so that the material resistance received by the stirring pin F2 from the sleeve main body 2 can be reduced as much as possible. In addition, in the present embodiment, the inclination angle β of the stepped side surface 12b of the peripheral wall stepped portion 12 is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so , the contact amount between the stirring pin F2 and the step side surface 12b can be made uniform in the height direction. Thereby, in this embodiment, since the plastic flow material is stirred with a high balance, it is possible to suppress a decrease in the strength of the joint portion.

[Ninth Embodiment]

Next, a method for manufacturing a liquid cooling jacket according to a ninth embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket according to the ninth embodiment, a preparation step, a mounting step, a first primary joining step, and a second primary joining step are performed. In the ninth embodiment, the preparation process, the placing process, and the second main joining process are the same as those in the seventh embodiment, and therefore the description is omitted. In addition, in the ninth embodiment, the description will focus on the parts different from the seventh embodiment.

As shown in FIG. 29 , the first main welding process is a process of friction stir welding the sleeve body 2 and the closure 3 using the rotary tool F. As shown in FIG. In the main joining process, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface F10 of the stirring pin F2 is not in contact with the stepped side surface 12b, and the flat surface F3 is slightly contacted with the stepped bottom surface 12a. state for friction stir welding.

According to the manufacturing method of the liquid cooling jacket of the present embodiment, the stirring pin F2 does not contact the stepped side surface 12b of the peripheral wall stepped portion 12, but the frictional heat between the closure member 3 and the stirring pin F2 causes contact with the first butting portion J1 by frictional heat. The second aluminum alloy on the side of the main closure 3 is agitated to plastically fluidize, so that the stepped side surface 12b and the outer peripheral side surface 3c of the closure 3 can be joined at the first butt joint J1. In addition, friction stirring is performed by bringing only the outer peripheral surface F10 of the stirring pin F2 into contact with only the closure 3 at the first butt portion J1 , so that the first aluminum alloy is hardly mixed into the closure 3 from the sleeve body 2 . As a result, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the first butt joint portion J1, and therefore, the reduction of the joint strength can be suppressed.

Moreover, since the step side surface 12b of the sleeve main body 2 is inclined outward, the contact between the stirring pin F2 and the step side surface 12b can be easily avoided. In addition, in the present embodiment, since the inclination angle β of the stepped side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), the stirring pin F2 can be avoided. While being in contact with the step side surface 12b, the stirring pin F2 can be brought as close as possible to the step side surface 12b.

In addition, the friction stir welding is performed by separating the outer peripheral surface F10 of the stirring pin F2 from the step side surface 12b, so that the material resistance received by the stirring pin F2 can be reduced on one side and the other side of the rotation center axis C of the stirring pin F2. Unbalance at the side. Thereby, since the plastic flow material is friction-stirred with a high balance, it is possible to suppress a decrease in the bonding strength. Preferably, as in the present embodiment, when the outer peripheral surface F10 of the stirring pin F2 does not come into contact with the step side surface 12b and the flat surface F3 is inserted deeper than the step bottom surface 12a, the outer peripheral surface F10 of the stirring pin F2 is inserted from the step side surface 12b. The separation distance L to the outer peripheral surface F10 of the stirring pin F2 is set to, for example, 0≦L≦0.5 mm, and more preferably 0≦L≦0.3 mm.

In addition, since the flat surface F3 of the stirring pin F2 is kept in slight contact with the step bottom surface 12a, the mixing of the first aluminum alloy from the casing body 2 to the closure 3 can be reduced as much as possible at the second abutting portion J2. Moreover, by inserting the flat surface F3 of the stirring pin F2 into the step bottom surface 12a, the friction stirring of the 2nd abutting part J2 can be performed more reliably. Thereby, generation of void defects and the like in the plasticized region W1 can be prevented, and the bonding strength can be improved. Moreover, the whole surface of the flat surface F3 of the stirring pin F2 is located in the center side of the closure member 3 rather than the outer peripheral side surface 3c of the closure member 3. As shown in FIG. Thereby, since the joining area of the 2nd abutting part J2 can be enlarged, the joining strength can be improved.

[Tenth Embodiment]

Next, a method of manufacturing a liquid cooling jacket according to a tenth embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket according to the tenth embodiment, the preparation step, the placing step, the first main joining step, and the second main joining step are performed. In the tenth embodiment, the preparation process, the placing process, and the second main joining process are the same as those in the first embodiment, and therefore the description is omitted. In addition, in the tenth embodiment, the description will center on the parts different from the ninth embodiment.

As shown in FIG. 30 , the first main welding step is a step of friction stir welding the first butt joint J1 using the rotary tool F. As shown in FIG. In the main joining process, when the stirring pin F2 is relatively moved along the first butt joint portion J1, the outer peripheral surface F10 of the stirring pin F2 and the stepped side surface 12b of the peripheral wall stepped portion 12 are slightly contacted, and the flat surface F3 is brought into contact with the layer. The friction stir welding is performed so that the bottom surface 12a is slightly in contact with each other.

Here, let the amount of contact between the outer peripheral surface F10 of the stirring pin F2 and the step side surface 12b be the offset amount N. As in the present embodiment, when the flat surface F3 of the stirring pin F2 is inserted deeper than the stepped bottom surface 12a of the peripheral wall stepped portion 12 and the outer peripheral surface F10 of the stirring pin F2 is brought into contact with the stepped side surface 12b, the offset The setting amount N is set between 0<N≤1.0mm, preferably 0<N≤0.85mm, more preferably 0<N≤0.65mm.

In the conventional liquid cooling jacket manufacturing method shown in FIG. 41 , the hardness of the jacket body 101 and the closure member 102 are different, so the material resistance received by the stirring pin F2 is between one side sandwiching the rotation center axis C and the other side. There is also a big difference on one side. Therefore, the plastic flow material is not stirred with a high balance, and thus, it becomes a factor of lowering the bonding strength. However, according to the present embodiment, the contact amount between the outer peripheral surface F10 of the stirring pin F2 and the sleeve body 2 is reduced as much as possible, so that the material resistance received by the stirring pin F2 from the sleeve main body 2 can be reduced as much as possible. In addition, in the present embodiment, since the inclination angle β of the stepped side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), the stirring pin F2 can be The amount of contact with the stepped side surface 12b is uniform in the height direction. Thereby, in this embodiment, since the plastic flow material is stirred with a high balance, it is possible to suppress a decrease in the strength of the joint portion.

In addition, since the flat surface F3 of the stirring pin F2 is kept in slight contact with the step bottom surface 12a, the mixing of the first aluminum alloy from the casing body 2 to the closure 3 can be reduced as much as possible at the second abutting portion J2. Moreover, by inserting the flat surface F3 of the stirring pin F2 into the step bottom surface 12a, the friction stirring of the 2nd abutting part J2 can be performed more reliably. Thereby, generation of void defects and the like in the plasticized region W1 can be prevented, and the bonding strength can be improved. That is, according to the present embodiment, both the first butting portion J1 and the second abutting portion J2 can be joined more firmly.

[Eleventh Embodiment]

Next, a method for manufacturing the liquid cooling jacket according to the eleventh embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket of the eleventh embodiment, a preparation step, a mounting step, a first main joining step, and a second main joining step are performed. In the eleventh embodiment, the preparation process, the placing process, and the first main joining process are the same as those in the seventh embodiment, and thus the description is omitted.

As shown in FIG. 31 , in the second final joining step of the eleventh embodiment, the outer peripheral surface F10 of the stirring pin F2 is slightly contacted with the stepped side surface 17b of the pillar stepped portion 17 , while the outer peripheral surface F10 of the stirring pin F2 The friction stirring is performed in a state where the flat surface F3 is separated from the step bottom surface 17a. The contact amount between the outer peripheral surface F10 of the stirring pin F2 and the step side surface 17b may be appropriately set, but it is preferably set to the offset amount N (refer to FIG. 28 ) with respect to the first main joining step of the eighth embodiment. same.

According to the second main joining process of the eleventh embodiment, by joining the pillar 15 and the closure 3, the joining can be firmly performed. In addition, since the outer peripheral surface F10 of the stirring pin F2 is kept in slight contact with the stepped side surface 17b of the pillar stepped portion 17, the mixing of the first aluminum alloy from the sleeve body 2 to the closure 3 can be reduced as much as possible. As a result, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the third butt joint portion J3, and therefore, the reduction of the joint strength can be suppressed. In addition, in the second main joining step of the eleventh embodiment, friction stirring may be performed in a state where the flat surface F3 and the stepped bottom surface 17a of the pillar stepped portion 17 are slightly in contact with each other. That is, in the second main joining step of the present embodiment, the outer peripheral surface F10 of the stirring pin F2 may be slightly contacted with the stepped side surface 17b, and the flat surface F3 may be slightly contacted with the stepped bottom surface 17a. Thereby, the mixing of the first aluminum alloy from the sleeve body 2 to the closure 3 can be reduced as much as possible, and the fourth butt joint J4 can be firmly joined.

[Twelfth Embodiment]

A method of manufacturing a liquid cooling jacket according to a twelfth embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 32 , the liquid cooling jacket 1 is manufactured by friction stir welding of the jacket main body 2 and the closure member 3 .

In the manufacturing method of the liquid cooling jacket of the present embodiment, a preparation process, a mounting process, a first main joining process, and a second main joining process are performed. The preparation process is a process of preparing the cover body 2 and the closure member 3 . The cover body 2 and the closure 3 of the present embodiment are the same as those of the seventh embodiment except that the thickness of the stepped side surface 12b is the same as that of the closure 3 .

As shown in FIG. 33 , the placing step is a step of placing the closure 3 on the case body 2 . In the placing step, the back surface 3b of the closure 3 is placed on the stepped bottom surface 12a. The stepped side surface 12b is abutted with the outer peripheral side surface 3c of the closure member 3 to form a first butt joint J1. Further, the stepped bottom surface 12a is abutted with the back surface 3b of the closure member 3 to form a second abutment portion J2. In the present embodiment, when the closure 3 is placed, the peripheral wall end surface 11 a of the peripheral wall portion 11 is coplanar with the front surface 3 a of the closure 3 .

In addition, the hole wall 4a of the hole portion 4 is abutted against the stepped side surface 17b of the pillar stepped portion 17 through the placing step, to form the third abutting portion J3. Further, the back surface 3b of the closure member 3 is abutted with the stepped bottom surface 17a of the pillar stepped portion 17 to form a fourth butted portion J4. In addition, in the present embodiment, the protruding portion 16 is formed so that the tip is tapered, but it may be formed in a columnar shape. That is, the stepped side surface 17b of the pillar stepped portion 17 may be in surface contact with the hole wall 4a of the hole portion 4, or the stepped side surface 17b of the pillar stepped portion 17 may be spaced from the hole wall 4a of the hole portion 4. Open a small gap relative to each other.

As shown in FIGS. 34 and 35 , the first main welding step is a step of friction stir welding the first butting portion J1 using the rotary tool FA. The rotary tool FA is composed of the connecting portion F1 and the stirring pin F2. The rotary tool FA is formed of, for example, tool steel. The connection part F1 is a part connected with the rotating shaft of a friction stirrer (illustration omitted). The connection portion F1 has a columnar shape, and a screw hole (not shown) for fastening a bolt is formed.

The stirring pin F2 hangs down from the connection part F1, and is coaxial with the connection part F1. The tip of the stirring pin F2 is gradually tapered as it moves away from the connecting portion F1. As shown in FIG. 35 , a flat flat surface F3 perpendicular to the rotation center axis C and a protrusion F4 protruding from the flat surface F3 are formed at the tip of the stirring pin F2. That is, the outer surface of the stirring pin F2 is comprised by the outer peripheral surface F10 of the tapered front end, the flat surface F3 formed in the front end, and the protrusion part F4. When viewed from the side, the inclination angle α formed by the rotation center axis C and the outer peripheral surface F10 of the stirring pin F2 may be appropriately set, for example, within a range of 5° to 30°, but in this embodiment, It is set to be the same as the inclination angle β of the stepped side surface 12 b of the peripheral wall stepped portion 12 and the inclination angle γ of the stepped side surface 17 b of the pillar stepped portion 17 .

A spiral groove is engraved on the outer peripheral surface F10 of the stirring pin F2. As shown in FIG. 34 , when friction stirring is performed using the rotary tool FA, only the stirring pin F2 rotated to the right is inserted into the closure 3, and the stirring pin F2 is moved while the closure 3 is separated from the connection portion F1. . In other words, friction stirring is performed in a state where the proximal end portion of the stirring pin F2 is exposed. A plasticized region W1 is formed in the movement locus of the rotary tool FA due to metal solidification after friction stirring. In the present embodiment, the stirring pin F2 is inserted at the start position Sp set to the closure 3 , and the rotary tool FA is relatively moved to the right with respect to the closure 3 .

As shown in FIG. 35 , in the first main joining step, only the stirring pin F2 is inserted into the closure 3, and the outer peripheral surface F10 of the stirring pin F2 and the stepped side surface 12b of the peripheral wall stepped portion 12 are not in contact with each other. , and rotate the rotary tool FA once along the first butt joint J1. In addition, in the present embodiment, the insertion depth is set so that the flat surface F3 of the stirring pin F2 does not contact the stepped bottom surface 12a of the peripheral wall stepped portion 12 of the casing body 2, and the projection portion F4 and the stepped bottom surface are set. 12a contacts. The front end surface F5 of the protruding portion F4 is in contact with the peripheral wall portion 11 . "The outer peripheral surface F10 of the stirring pin does not contact the stepped side surface 12b of the peripheral wall stepped portion 12" also includes the case where the distance between the outer peripheral surface F10 of the stirring pin F2 and the stepped side surface 12b is zero during friction stirring.

If the distance from the stepped side surface 12b to the outer peripheral surface F10 of the stirring pin F2 is too long, the joint strength of the first butt joint portion J1 will decrease. The separation distance L from the stepped side surface 12b to the outer peripheral surface F10 of the stirring pin F2 may be appropriately set according to the materials of the sleeve body 2 and the closure 3, but it is preferable to set the outer peripheral surface of the stirring pin F2 as in the present embodiment. When the surface F10 is not in contact with the stepped side surface 12b and the flat surface F3 is not in contact with the stepped bottom surface 12a, for example, 0≤L≤0.5mm, more preferably 0≤L≤0.3mm .

After the rotary tool FA is rotated around the closure 3 once, the beginning and the end of the plasticized region W1 are made to overlap. The rotary tool FA can also be pulled up gradually in the front surface 3 a of the closure 3 . FIG. 36 is a cross-sectional view of the joined portion after the main joining process of the present embodiment. The plasticized region W1 is formed on the side of the closure member 3 with the first abutting portion J1 as a boundary. Further, the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a (see FIG. 35 ), and the plasticized region W1 is formed beyond the second abutting portion J2 to reach the sleeve body 2 .

As shown in FIGS. 37 and 38 , the second main welding step is a step of friction stir welding the third facing portion J3 using the rotary tool FA. As shown in FIG. 37 , in the second main joining process, only the stirring pin F2 rotated to the right is inserted into the start position Sp set on the front surface 3a of the closure 3, and the closure 3 is separated from the connection portion F1 while the closure 3 is separated. While moving the stirring pin F2. In other words, friction stirring is performed in a state where the proximal end portion of the stirring pin F2 is exposed. A plasticized region W2 is formed in the movement locus of the rotary tool FA due to the solidification of the metal after friction stirring.

In the second main joining step, as shown in FIG. 38 , friction stirring is performed so that the outer peripheral surface F10 of the stirring pin F2 and the stepped side surface 17b of the pillar stepped portion 17 are separated from each other. Further, the rotary tool FA is relatively moved along the fourth abutting portion J4 in a state in which the flat surface F3 of the stirring pin F2 is not in contact with the stepped bottom surface 17a and the protrusion F4 is in contact with the stepped bottom surface 17a. The front end surface F5 of the protruding portion F4 is in contact with the support column 15 . After the rotary tool FA is rotated one turn along the protruding portion 16 , the start end and the end end of the plasticized region W2 are made to overlap. Friction stirring is performed in a state in which the flat surface F3 of the stirring pin F2 does not come into contact with the stepped bottom surface 17a of the pillar stepped portion 17 and the protrusion portion F4 is in contact with the stepped bottom surface 17a. Therefore, the plasticized region W2 is formed so as to reach the first Four docking parts J4. That is, in the second main joining process, the fourth abutting portion J4 is plastically fluidized by the frictional heat between the stirring pin F2 and the closure 3 and the strut 15 to be joined.

According to the manufacturing method of the liquid cooling jacket of the present embodiment described above, the stirring pin F2 of the rotary tool FA does not contact the stepped side surface 12b of the peripheral wall stepped portion 12, but the frictional heat between the closure 3 and the stirring pin F2 is in contact with each other. The second aluminum alloy on the side of the main closure member 3 in the first butt joint J1 is stirred to be plastically fluidized, so that the stepped side surface 12b and the outer peripheral side surface 3c of the closure member 3 can be joined at the first butt joint portion J1. . In addition, since only the stirring pin F2 is brought into contact with the closure member 3 to perform friction stirring, the first aluminum alloy is hardly mixed into the closure member 3 from the sleeve body 2 . As a result, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the first butt joint portion J1, and therefore, the reduction of the joint strength can be suppressed.

Further, in the first main joining step, the stepped side surface 12b of the sleeve body 2 is inclined outward, so that the contact between the stirring pin F2 and the sleeve body 2 can be easily avoided. In addition, in the present embodiment, since the inclination angle β of the stepped side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), it is possible to avoid the stirring pin While F2 is in contact with the stepped side surface 12b, the stirring pin F2 is brought as close as possible to the stepped side surface 12b.

In addition, in the first main welding step, only the stirring pin F2 is brought into contact with the closure 3 to perform friction stir welding, so that the material resistance received by the stirring pin F2 can be eliminated on the side of the rotation center axis C of the stirring pin F2 and imbalance at the other side. Thereby, since the plastic flow material is friction-stirred with a high balance, it is possible to suppress a decrease in the bonding strength.

In addition, in the first main joining step, the rotation direction and the advancing direction of the rotary tool FA may be appropriately set, but the rotation direction and the advancing direction of the rotary tool FA are set so as to be formed in the movement locus of the rotary tool FA. In the plasticized region W1, the side of the sleeve body 2 becomes the shear side, and the side of the closure member 3 becomes the flow side. By setting the side of the sleeve body 2 to be the shearing side, the stirring action of the stirring pin F2 around the first butting portion J1 is increased, the temperature at the first butting portion J1 can be expected to rise, and the The step side surface 12b and the outer peripheral side surface 3c of the closure member 3 are joined more reliably at the first butt joint portion J1.

Furthermore, the first aluminum alloy of the sleeve body 2 is a material having a higher hardness than that of the second aluminum alloy of the closure 3 . Thereby, the durability of the liquid cooling jacket 1 can be improved. In addition, preferably, the first aluminum alloy of the sleeve body 2 is an aluminum alloy casting material, and the second aluminum alloy of the closure 3 is an aluminum alloy ductile material. By making the first aluminum alloy an Al—Si—Cu series aluminum alloy casting material such as JISH5302ADC12, the castability, strength, machinability, and the like of the sleeve body 2 can be improved. Moreover, by making the second aluminum alloy into, for example, the JISA1000 series or the A6000 series, workability and thermal conductivity can be improved.

In addition, in the present embodiment, the flat surface F3 of the stirring pin F2 is not inserted deeper than the step bottom surface 12a in the first butting portion J1, but since the plasticized region W1 reaches the second abutting portion J2, it is possible to Improve joint strength.

Further, in the second abutting portion J2, since the protruding portion F4 is formed on the flat surface F3 on the front end side of the stirring pin F2, the plastic flow material that is friction-stirred along the protruding portion F4 and rolled up by the protruding portion F4 is removed. Press the flat surface F3. Thereby, friction stirring can be performed more reliably around the protrusion part F4, and since the oxide film of the 4th butt-joint part J4 is cut|disconnected reliably, the joining strength of the 4th butt-joint part J4 can be improved. In addition, the friction stirring is performed in a state in which the flat surface F3 of the stirring pin F2 is not in contact with the stepped bottom surface 17a, and the protrusions F4 are brought into contact with the stepped bottom surface 17a of the pillar stepped portion 17, so that the stepped portion can be reduced. The width of the plasticized zone at the bottom surface 17a. Thereby, the width of the stepped bottom surface 17a can also be set small.

In addition, since the friction stirring is performed in a state where the flat surface F3 of the stirring pin F2 and the step bottom surface 17a are not in contact with each other, the first aluminum alloy is hardly closed from the sleeve body 2 toward the fourth abutting portion J4. Since the material 3 is mixed in, the second aluminum alloy mainly on the side of the closing material 3 is friction-stirred at the fourth abutting portion J4, thereby suppressing a decrease in the joint strength. That is, in the present embodiment, while the oxide film of the fourth abutting portion J4 is reliably cut off, the mixing of the first aluminum alloy from the jacket body 2 to the closure 3 is suppressed.

In addition, in the second main joining step, although the stirring pin F2 of the rotary tool FA does not contact the stepped side surface 17b of the pillar stepped portion 17, the third abutting portion J3 is heated by the frictional heat between the closure 3 and the stirring pin F2. The main thing is that the second aluminum alloy on the side of the closure member 3 is stirred to plastically fluidize, so that the step side 17b and the hole wall 4a of the hole portion 4 can be joined at the third butt joint J3. In addition, since only the stirring pin F2 is brought into contact with the closure member 3 to perform friction stirring, the first aluminum alloy is hardly mixed into the closure member 3 from the sleeve body 2 . As a result, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the third butt joint portion J3, and therefore, the reduction of the joint strength can be suppressed.

In addition, in the second main joining step, the stepped side surface 17b of the sleeve body 2 is inclined so that the tip is tapered, so that the contact between the stirring pin F2 and the sleeve body 2 can be easily avoided. In addition, in the present embodiment, since the inclination angle γ of the stepped side surface 17b is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 17b is made parallel to the outer peripheral surface F10 of the stirring pin F2), it is possible to avoid the stirring pin The stirring pin F2 is brought as close as possible to the step side surface 17b while the F2 is in contact with the step side surface 17b.

In addition, in the second main welding step, only the stirring pin F2 is brought into contact with the closure 3 to perform friction stir welding, so that the material resistance received by the stirring pin F2 can be eliminated on the side of the rotation center axis C of the stirring pin F2 and imbalance at the other side. Thereby, since the plastic flow material is friction-stirred with a high balance, it is possible to suppress a decrease in the bonding strength.

In addition, in the second main joining process, the rotation direction and the advancing direction of the rotary tool FA may be appropriately set, but the rotation direction and the advancing direction of the rotary tool FA are set so as to be formed in the movement trajectory of the rotary tool FA. In the plasticized region W1, the side of the sleeve body 2 becomes the shear side, and the side of the closure member 3 becomes the flow side. In addition, by setting the side of the sleeve body 2 to be the shearing side, the stirring action of the stirring pin F2 around the third abutting portion J3 is increased, the temperature at the third abutting portion J3 can be expected to rise, and The stepped side surface 17b and the hole wall 4a of the hole portion 4 can be joined more reliably at the third abutting portion J3.

In addition, since friction stirring is performed in a state where the flat surface F3 of the stirring pin F2 and the stepped bottom surface 17a of the pillar stepped portion 17 are not in contact with each other, the first aluminum alloy hardly does not come into contact with the fourth abutting portion J4. Mixed in from the sleeve body 2 toward the closure 3 . Thereby, the second aluminum alloy on the side of the closure member 3 is friction-stirred mainly at the fourth abutting portion J4, so that the decrease in the joint strength can be suppressed. In addition, by joining the struts 15 and the closure 3, the strength of the liquid cooling jacket 1 as a whole can be improved.

In addition, any one of the first main joining step and the second main joining step may be performed first. In addition, before the first main joining process, at least one of the first butt joint portion J1 and the second butt joint portion J2 may be temporarily joined by friction stirring or welding. By performing the temporary bonding, the cracking of each of the butted portions at the time of the first main joining process and the second main joining process can be prevented.

[Thirteenth Embodiment]

Next, a method of manufacturing a liquid cooling jacket according to a thirteenth embodiment of the present invention will be described. In the manufacturing method of the liquid cooling jacket according to the thirteenth embodiment, a preparation step, a mounting step, a first main joining step, and a second main joining step are performed. In the thirteenth embodiment, the preparation process, the placing process, and the second main joining process are the same as those in the twelfth embodiment, and therefore the description is omitted. In addition, in the thirteenth embodiment, the description will center on the difference from the twelfth embodiment.

As shown in FIG. 39 , the first main welding step is a step of friction stir welding the first butt joint J1 using the rotary tool FA. In the main joining process, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface F10 of the stirring pin F2 is slightly contacted with the stepped side surface 12b of the peripheral wall stepped portion 12, and the protruding portion F4 is not The friction stir welding is performed in a state where the stepped bottom surfaces 12a are in contact with each other. In the first main bonding process, the flat surface F3 and the stepped bottom surface 12a are not brought into contact with each other.

Here, let the amount of contact between the outer peripheral surface F10 of the stirring pin F2 and the step side surface 12b be the offset amount N. When the outer peripheral surface F10 of the stirring pin F2 is brought into contact with the stepped side surface 12b and the flat surface F3 of the stirring pin F2 is not brought into contact with the stepped bottom surface 12a as in the present embodiment, the offset amount N is set to 0< Between N≤0.5mm, it is more preferable to set between 0<N≤0.25mm.

In the conventional liquid cooling jacket manufacturing method shown in FIG. 41 , the hardness of the jacket body 101 and the closure member 102 are different, so the material resistance received by the stirring pin F2 is between one side sandwiching the rotation center axis C and the other side. There is also a big difference on one side. Therefore, the plastic flow material is not stirred with a high balance, and thus, it becomes a factor of lowering the bonding strength. However, according to the present embodiment, the contact amount between the outer peripheral surface F10 of the stirring pin F2 and the sleeve body 2 is reduced as much as possible, so that the material resistance received by the stirring pin F2 from the sleeve main body 2 can be reduced as much as possible. In addition, in the present embodiment, the inclination angle β of the stepped side surface 12b of the peripheral wall stepped portion 12 is made the same as the inclination angle α of the stirring pin F2 (the stepped side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so , the contact amount between the stirring pin F2 and the step side surface 12b can be made uniform in the height direction. Thereby, in this embodiment, since the plastic flow material is stirred with a high balance, it is possible to suppress a decrease in the strength of the joint portion.

In addition, in the thirteenth embodiment, as in the first modification and the second modification of the first embodiment, the plate thickness of the closure 3 may be increased, or an inclined surface may be provided on the outer peripheral side surface.

[Fourteenth Embodiment]

Next, a method of manufacturing the liquid cooling jacket according to the fourteenth embodiment will be described. In the method of manufacturing a liquid cooling jacket according to the fourteenth embodiment, a preparation step, a mounting step, a first primary joining step, and a second primary joining step are performed. In the present embodiment, the second main joining step is different from the other embodiments in that the stirring pin F2 and the protruding portion 16 are slightly brought into contact with each other.

In the second main joining step, as shown in FIG. 40 , friction stirring is performed in a state where the outer peripheral surface F10 of the stirring pin F2 and the stepped side surface 17b of the pillar stepped portion 17 are slightly in contact with each other. In addition, friction stirring is performed in a state in which the flat surface F3 and the stepped bottom surface 17a are not brought into contact and the protrusions F4 are brought into contact with the stepped bottom surface 17a. Preferably, the outer peripheral surface F10 of the stirring pin F2 and the stepped side surface 17b have the same inclination angle (the outer peripheral surface F10 is parallel to the stepped side surface 17b).

By the second main joining process, the plastic flow material wound up by the projection portion F4 is pressed by the flat surface F3. Thereby, friction stirring can be performed more reliably around the protrusion part F4, and the oxide film of the 4th abutting part J4 can be cut|disconnected reliably. Thereby, the joining strength of the 4th abutting part J4 can be improved. In addition, by setting the flat surface F3 so as not to contact the stepped bottom surface 17a as in this modification, the width of the plasticized region W2 can be reduced compared to the case where the flat surface F3 is inserted deeper than the stepped bottom surface 17a . Thereby, the plastic flow material can be prevented from flowing out to the recessed portion 13, and the width of the stepped bottom surface 17a of the strut stepped portion 17 can be set small. In addition, what is necessary is just to set the contact amount of the stirring pin F2 and the protrusion part 16 to be the same as the 1st main joining process of thirteenth embodiment.

(Symbol Description)

1 liquid cooling jacket;

2 sets of main bodies;

3 closures;

3a Front;

3b back;

3c Peripheral side;

10 bottom;

11 perimeter walls;

11a End face of peripheral wall;

12 perimeter wall layer difference;

12a Floor difference;

12b Level difference side;

13 recess;

17 Column level difference;

17a Level difference bottom surface;

17b Level difference side;

F rotate tool;

F2 stirring pin;

J1 first docking part;

J2 second docking part;

J3 third docking part;

J4 fourth docking part;

K workbench (cooling plate);

W1 plasticization region;

W2 plasticizing region;

WP Cooling Tube.

Claims (39)

1. A method of manufacturing a liquid-cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion standing up from a peripheral edge of the bottom, and a peripheral wall portion standing up from the bottom A strut raised up, the closure includes a hole into which the front end of the strut is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid-cooled jacket, the jacket is heated by friction stirring. The body engages the closure, characterized in that, The sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a type of material with a higher hardness than that of the second aluminum alloy, The outer peripheral surface of the stirring pin of the rotary tool is inclined so that the tip is tapered, The manufacturing method of the liquid cooling jacket includes: a preparatory step in which a peripheral wall stepped portion is formed on an inner peripheral edge of the peripheral wall portion, the peripheral wall stepped portion having a stepped bottom surface and a stepped bottom surface extending outward from the stepped bottom surface toward the opening portion A step side surface that rises obliquely in a manner, and a pillar step portion is formed at the front end of the pillar, and the pillar step portion has a step bottom surface and a step side surface rising from the step bottom surface; A placing process in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first step. a butt portion, and the stepped bottom surface of the peripheral wall stepped portion is overlapped with the back surface of the closure to form a second butted portion, and then the stepped side surface of the pillar stepped portion is made to coincide with all the closed parts. The hole walls of the hole parts are butted to form a third butt joint, and the stepped bottom surface of the pillar stepped part is overlapped with the back surface of the closure part to form a fourth butt joint; A first main joining step in which only the rotating stirring pin is inserted into the closure, and in a state where only the stirring pin and only the closure are brought into contact, the the rotating tool rotates one turn along the first abutting portion to perform friction stirring; and The second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the stirring pin is slightly contacted with the stepped side surface of the pillar stepped portion. In the state, the rotating tool is rotated one turn along the third abutting part to perform friction stirring. 2. The method for manufacturing a liquid cooling jacket according to claim 1, wherein, In the second main joining step, the rotary tool is then rotated once along the third abutting portion in a state where the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion. , for friction stirring. 3. A method of manufacturing a liquid cooling jacket, the liquid cooling jacket being composed of a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion standing up from a peripheral edge of the bottom, and a peripheral wall portion standing up from the bottom A strut raised up, the closure includes a hole into which the front end of the strut is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid-cooled jacket, the jacket is heated by friction stirring. The body engages the closure, characterized in that, The sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a type of material with a higher hardness than that of the second aluminum alloy, The outer peripheral surface of the stirring pin of the rotary tool is inclined so that the tip is tapered, The manufacturing method of the liquid cooling jacket includes: a preparatory step in which a peripheral wall stepped portion is formed on an inner peripheral edge of the peripheral wall portion, the peripheral wall stepped portion having a stepped bottom surface and a stepped bottom surface extending outward from the stepped bottom surface toward the opening portion A step side surface erected obliquely in a manner, and a pillar step portion is formed at the front end of the pillar, the pillar step portion having a step bottom surface and a step side surface rising from the step bottom surface; A placing process in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first step. a butt portion, and the stepped bottom surface of the peripheral wall stepped portion is overlapped with the back surface of the closure to form a second butted portion, and then the stepped side surface of the pillar stepped portion is made to coincide with all the closed parts. The hole walls of the hole parts are butted to form a third butt joint, and the stepped bottom surface of the pillar stepped part is overlapped with the back surface of the closure part to form a fourth butt joint; A first main joining step in which only the stirring pin that is rotated is inserted into the closure, and the stirring pin is slightly contacted with the stepped side surface of the peripheral wall stepped portion. In the state, the rotating tool is rotated one turn along the first butt joint to perform friction stirring; and The second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the stirring pin is slightly contacted with the stepped side surface of the pillar stepped portion. In the state, the rotating tool is rotated one turn along the third abutting part to perform friction stirring. 4. The manufacturing method of the liquid cooling jacket according to claim 3, wherein, In the first main joining step, the rotary tool is then rotated once along the first abutting portion in a state where the stirring pin is slightly in contact with the stepped bottom surface of the peripheral wall stepped portion. , for friction stirring. 5. The method for manufacturing a liquid cooling jacket according to claim 3 or 4, wherein, In the second main joining step, the rotary tool is then rotated once along the third abutting portion in a state where the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion. , for friction stirring. 6. The manufacturing method of the liquid cooling jacket according to claim 1 or 3, wherein, In the preparation process, the cover body is formed by casting and the bottom portion is formed to protrude toward the front side, and the closure member is formed to protrude toward the front side. 7. The manufacturing method of the liquid cooling jacket according to claim 6, wherein, The deformation amount of the sleeve body is measured in advance, and in the first final joining step and the second final joining step, the insertion depth of the stirring pin of the rotary tool is adjusted according to the deformation amount, While doing friction stirring. 8. The method for manufacturing a liquid cooling jacket according to claim 1 or 3, wherein, A provisional joining process is included before the first main joining process and the second main joining process, and in the provisional joining process, at least one of the first butting portion and the third butting portion is subjected to Temporary engagement. 9. The manufacturing method of the liquid cooling jacket according to claim 1 or 3, wherein, In the first main joining step and the second main joining step, a cooling plate through which a cooling medium flows is provided on the back side of the bottom, and the jacket body and the jacket are connected to the jacket body and the casing by the cooling plate. The closures were cooled while friction stirring. 10. The method for manufacturing a liquid cooling jacket according to claim 9, wherein, The front side of the cooling plate is brought into contact with the back side of the bottom. 11. The method for manufacturing a liquid cooling jacket according to claim 9, wherein, The cooling plate has a cooling flow path through which the cooling medium flows, The cooling flow path includes a planar shape along a movement trajectory of the rotary tool in the first main joining process. 12. The method for manufacturing a liquid cooling jacket according to claim 9, wherein, A cooling flow path through which the cooling medium flows is constituted by a cooling pipe embedded in the cooling plate. 13. The method for manufacturing a liquid cooling jacket according to claim 1 or 3, characterized in that, In the first primary joining step and the second primary joining step, the casing body and the closure are closed while flowing a cooling medium in the hollow portion formed by the casing body and the closure. The pieces were cooled while friction stirring was performed. 14. A method of manufacturing a liquid cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion standing up from a peripheral edge of the bottom, and a peripheral wall portion standing up from the bottom The sealing member forms a hole into which the front end of the support is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid cooling jacket, the jacket is heated by friction stirring The body engages the closure, characterized in that, The sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a type of material with a higher hardness than that of the second aluminum alloy, The outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is inclined so that the tip is tapered, The manufacturing method of the liquid cooling jacket includes: a preparatory step in which a peripheral wall stepped portion having a stepped bottom surface and a layer rising from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion a stepped side surface, and a strut stepped portion having a stepped bottom surface and a layer rising obliquely from the stepped bottom surface so that the leading end of the strut is tapered is formed at the front end of the strut the difference side, and then setting the plate thickness of the closure to be larger than the height dimension of the step side of the pillar step portion; A placing process in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first step. a butting portion, and the stepped bottom surface of the peripheral wall stepped portion is overlapped with the back surface of the closure to form a second butting portion, and the stepped side surface of the pillar stepped portion and the hole portion are made to overlap. A third abutting portion is formed in such a way that there is a gap when the hole walls are butted together, and the stepped bottom surface of the pillar stepped portion is overlapped with the back surface of the closure member to form a fourth abutting portion; and A second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the outer peripheral surface of the stirring pin and the stepped side surface of the step portion of the pillar are inserted. When the rotary tool is moved along the third abutting portion without contacting, friction stirring is performed while the second aluminum alloy of the closure member flows into the gap. 15. The method for manufacturing a liquid cooling jacket according to claim 14, wherein, In the second main joining step, the rotary tool is moved along the third abutting portion in a state where the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion so as to Friction stirring is performed. 16. A method of manufacturing a liquid cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion standing up from a peripheral edge of the bottom, and a peripheral wall portion standing up from the bottom The sealing member forms a hole into which the front end of the support is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid cooling jacket, the jacket is heated by friction stirring The body engages the closure, characterized in that, The sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a type of material with a higher hardness than that of the second aluminum alloy, The outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is inclined so that the tip is tapered, The manufacturing method of the liquid cooling jacket includes: a preparatory step in which a peripheral wall stepped portion having a stepped bottom surface and a layer rising from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion a stepped side surface, and a strut stepped portion having a stepped bottom surface and a layer rising obliquely from the stepped bottom surface so that the leading end of the strut is tapered is formed at the front end of the strut the difference side, and then setting the plate thickness of the closure to be larger than the height dimension of the step side of the pillar step portion; A placing process in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first step. a butting portion, and the stepped bottom surface of the peripheral wall stepped portion is overlapped with the back surface of the closure to form a second butting portion, and the stepped side surface of the pillar stepped portion and the hole portion are made to overlap. A third abutting portion is formed in such a way that there is a gap when the hole walls are butted together, and the stepped bottom surface of the pillar stepped portion is overlapped with the back surface of the closure member to form a fourth abutting portion; and A second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the outer peripheral surface of the stirring pin and the stepped side surface of the step portion of the pillar are inserted. When the rotary tool is moved along the third abutting portion in a slightly contacted state, friction stirring is performed while the second aluminum alloy of the closure member flows into the gap. 17. The method for manufacturing a liquid cooling jacket according to claim 16, wherein, In the second main joining step, the rotary tool is moved along the third abutting portion in a state where the stirring pin is slightly in contact with the stepped bottom surface of the strut stepped portion so as to Friction stirring is performed. 18. The method for manufacturing a liquid cooling jacket according to claim 14 or 16, wherein, A first main joining step is performed in which friction stirring is performed by moving the rotary tool along the first abutting portion and rotating it once around the opening. 19. The method for manufacturing a liquid cooling jacket according to claim 18, wherein, In the preparation process, the cover body is formed by casting and the bottom portion is formed to protrude toward the front side, and the closure member is formed to protrude toward the front side. 20. The method for manufacturing a liquid cooling jacket according to claim 19, wherein, The deformation amount of the sleeve body is measured in advance, and in the first final joining step and the second final joining step, the insertion depth of the stirring pin of the rotary tool is adjusted according to the deformation amount, While doing friction stirring. 21. The method for manufacturing a liquid cooling jacket according to claim 18, wherein, A provisional joining step is included before the first main joining step and the second main joining step. In the provisional joining step, the first butt joint or the third butt joint is provisionally joined. 22. The method for manufacturing a liquid cooling jacket according to claim 18, wherein, In the first main joining step, a cooling plate through which a cooling medium flows is provided on the back side of the bottom portion, and friction is performed while cooling the jacket body and the closure by the cooling plate. Stir. 23. The method for manufacturing a liquid cooling jacket according to claim 22, wherein, The front side of the cooling plate is brought into contact with the back side of the bottom. 24. The method for manufacturing a liquid cooling jacket according to claim 22, wherein, The cooling plate has a cooling flow path through which the cooling medium flows, The cooling flow path includes a planar shape along a movement trajectory of the rotary tool in the first main joining process. 25. The method for manufacturing a liquid cooling jacket according to claim 22, wherein, A cooling flow path through which the cooling medium flows is constituted by a cooling pipe embedded in the cooling plate. 26. The method for manufacturing a liquid cooling jacket according to claim 18, wherein, In the first main joining step, friction stirring is performed while cooling the jacket body and the closure by allowing a cooling medium to flow in the hollow portion formed by the jacket body and the closure. . 27. A method of manufacturing a liquid cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion standing up from a peripheral edge of the bottom, and a peripheral wall portion standing up from the bottom A strut raised up, the closure includes a hole into which the front end of the strut is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid-cooled jacket, the jacket is heated by friction stirring. The main body is engaged with the closure, characterized in that, The sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a type of material with a higher hardness than that of the second aluminum alloy, The outer peripheral surface of the stirring pin of the rotary tool is inclined so that the tip is tapered, A flat surface is formed on the front end side of the stirring pin, and the flat surface includes a protruding protrusion, The manufacturing method of the liquid cooling jacket includes: a preparatory step in which a peripheral wall stepped portion having a stepped bottom surface and a layer rising from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion a stepped side surface, and a strut stepped portion is formed at the front end of the strut, the strut stepped portion has a stepped bottom surface and a stepped lateral surface erected from the stepped bottom surface; A placing process in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first step. a butt portion, and the stepped bottom surface of the peripheral wall stepped portion is overlapped with the back surface of the closure to form a second butted portion, and then the stepped side surface of the pillar stepped portion is made to coincide with all the closed parts. The hole walls of the hole portion are butted to form a third abutment portion, and the stepped bottom surface of the pillar stepped portion is overlapped with the back surface of the closure member to form a fourth abutment portion; and A second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the outer peripheral surface of the stirring pin and the stepped side surface of the step portion of the pillar are inserted. The rotating tool is moved along the third abutting portion to perform friction stirring in a state in which the protruding portion of the stirring pin is not in contact with the stepped bottom surface of the strut stepped portion. 28. The method for manufacturing a liquid cooling jacket according to claim 27, wherein, In the second main joining step, the rotary tool is then moved along the third step in a state in which the flat surface of the stirring pin and the stepped bottom surface of the strut stepped portion are not in contact with each other. The butt is moved for friction stirring. 29. A method of manufacturing a liquid cooling jacket comprising a jacket main body and a closure, wherein the jacket main body has a bottom, a peripheral wall portion standing up from a peripheral edge of the bottom, and a peripheral wall portion standing up from the bottom A strut raised up, the closure includes a hole into which the front end of the strut is inserted, and closes the opening of the jacket body, and in the method for manufacturing the liquid-cooled jacket, the jacket is heated by friction stirring. The main body is engaged with the closure, characterized in that, The sleeve body is formed of a first aluminum alloy, the closure member is formed of a second aluminum alloy, and the first aluminum alloy is a type of material with a higher hardness than that of the second aluminum alloy, The outer peripheral surface of the stirring pin of the rotary tool is inclined so that the tip is tapered, A flat surface is formed on the front end side of the stirring pin, and the flat surface includes a protruding protrusion, The manufacturing method of the liquid cooling jacket includes: a preparatory step in which a peripheral wall stepped portion having a stepped bottom surface and a layer rising from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion a stepped side surface, and a strut stepped portion is formed at the front end of the strut, the strut stepped portion has a stepped bottom surface and a stepped lateral surface erected from the stepped bottom surface; A placing process in which the closure member is placed on the sleeve body so that the stepped side surface of the peripheral wall stepped portion is abutted with the outer peripheral side surface of the closure member to form a first step. a butt portion, and the stepped bottom surface of the peripheral wall stepped portion is overlapped with the back surface of the closure to form a second butted portion, and then the stepped side surface of the pillar stepped portion is made to coincide with all the closed parts. The hole walls of the hole portion are butted to form a third abutment portion, and the stepped bottom surface of the pillar stepped portion is overlapped with the back surface of the closure member to form a fourth abutment portion; and A second main joining step in which only the stirring pin that is rotated is inserted into the closure, and the outer peripheral surface of the stirring pin and the stepped side surface of the step portion of the pillar are inserted. The rotary tool is moved along the third abutting portion to perform friction stirring in a state in which the protruding portion of the stirring pin is in slight contact with the stepped bottom surface of the strut stepped portion. 30. The method for manufacturing a liquid cooling jacket according to claim 29, wherein, In the second main joining step, the rotary tool is then moved along the third step in a state in which the flat surface of the stirring pin and the stepped bottom surface of the strut stepped portion are not in contact with each other. The butt is moved for friction stirring. 31. The method for manufacturing a liquid cooling jacket according to claim 27 or 29, wherein, The manufacturing method of the liquid cooling jacket includes a first main joining process, in which the rotary tool is moved along the first abutting part and rotated around the opening part once, for friction stirring. 32. The method for manufacturing a liquid cooling jacket according to claim 31, wherein: In the preparation process, the cover body is formed by casting and the bottom portion is formed to protrude toward the front side, and the closure member is formed to protrude toward the front side. 33. The method for manufacturing a liquid cooling jacket according to claim 32, wherein: The deformation amount of the sleeve body is measured in advance, and in the first final joining step and the second final joining step, the insertion depth of the stirring pin of the rotary tool is adjusted according to the deformation amount. Friction stirring. 34. The method for manufacturing a liquid cooling jacket according to claim 31, wherein: A provisional joining step is included before the first main joining step and the second main joining step. In the provisional joining step, the first butt joint or the third butt joint is provisionally joined. 35. The method for manufacturing a liquid cooling jacket according to claim 31, wherein, In the first main joining step, a cooling plate through which a cooling medium flows is provided on the back side of the bottom portion, and friction is performed while cooling the jacket body and the closure by the cooling plate. Stir. 36. The method for manufacturing a liquid cooling jacket according to claim 35, wherein, The front side of the cooling plate is brought into contact with the back side of the bottom. 37. The method for manufacturing a liquid cooling jacket according to claim 35, wherein: The cooling plate has a cooling flow path through which the cooling medium flows, The cooling flow path includes a planar shape along a movement trajectory of the rotary tool in the first main joining process. 38. The method for manufacturing a liquid cooling jacket according to claim 35, wherein: A cooling flow path through which the cooling medium flows is constituted by a cooling pipe embedded in the cooling plate. 39. The method for manufacturing a liquid cooling jacket according to claim 31, wherein: In the first main joining step, friction stirring is performed while cooling the jacket body and the closure by allowing a cooling medium to flow in the hollow portion formed by the jacket body and the closure. .

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