JP4988246B2 - Method for joining pipe and plate - Google Patents

Description

  The present invention relates to a method for joining a pipe and a plate material such as a flange.

  Conventionally, for example, the following method is used as a method of joining a plate material such as a flange to a pipe.

  The pipe is inserted into an insertion hole provided in the plate material, and an expanding die having a wedge hole portion and divided into a plurality of portions around the wedge hole portion in the circumferential direction is disposed in the hollow portion of the pipe. To do. Next, each die segment of the die is moved radially outward of the pipe by inserting the wedge portion of the mandrel into the wedge hole portion of the die. In this way, the expansion processing target portion consisting of the insertion portion into the insertion hole of the pipe and the portions near both sides in the axial direction is pushed outward by the die segment (expansion processing), and the plate material is joined to the pipe by this method. (For example, see Patent Documents 1 and 2). This joining method is also called a ridge lock method.

In addition, although it is not the method of joining a board | plate material to a pipe, the method described, for example in Unexamined-Japanese-Patent No. 2002-224743 is known as a cylindrical expansion method using a die (patent document 3).
Japanese Patent Laid-Open No. 4-8818 (page 2, FIG. 8) Japanese Patent Laid-Open No. 11-36859 JP 2002-224743 A

  Therefore, in the conventional joining method described above, it is necessary to increase the rigidity of the plate material by setting the thickness of the plate material to be thick in order to be able to withstand the load applied to the plate material during the expanding process. That is, it is necessary to make the rigidity of the plate material higher than the rigidity of the pipe. As a result, there is a problem that the weight of the obtained bonded structure becomes heavy. When the weight of the joining structure is increased in this way, the fuel consumption of the automobile when the joining structure is an automobile part such as a steering support beam, a steering column holder, a muffler, a frame, a propeller shaft, and a suspension arm, for example. Cause the problem of getting worse.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to provide a joining method between a pipe and a plate material that can reduce the weight of a joined structure in which the plate material is joined to the pipe. An object of the present invention is to provide a bonding structure obtained and a bonding apparatus used in this bonding method.

  The present invention provides the following means.

[1] The pipe is inserted into an insertion hole provided in the plate material, and an expanding die that is divided into a plurality of parts in the circumferential direction is arranged in the hollow portion of the pipe,
Next, each die segment of the die is moved outward in the radial direction of the pipe, so that at least a part of the portion to be expanded consisting of the insertion portion into the insertion hole of the pipe and the portions near both sides in the axial direction is expanded. , A method of joining a plate and a plate, joining a plate to a pipe,
A short cylindrical seat protrudes in the axial direction of the pipe and is provided integrally with the peripheral edge of the plate material insertion hole,
The seat portion of the plate material is arranged in a superposed state on the outer peripheral surface of the pipe, and the expanding process is performed in a state where the amount of bulging to the outside of the seat portion is regulated by the regulating member arranged on the outside of the seat portion. And joining method of pipe and plate material.

[2] The cross-sectional shape of the pipe is a polygonal shape, and the cross-sectional shape of each corner of the pipe is a substantially arc shape,
The cross-sectional shape of the plate material insertion hole is a shape corresponding to the cross-sectional shape of the pipe,
The die is divided at a position corresponding to each flat wall portion of the pipe,
The joining method of the pipe and board | plate material of the preceding clause 1 which performs an expanding process by moving each die segment of die | dye to radial direction outward of a pipe toward each corner | angular part of a pipe.

  [3] The regulating member is arranged outside the seat portion of the plate material so that the gap between the regulating member and the corner portion of the seat portion is larger than the gap between the regulating member and the flat wall portion of the seat portion. The method of joining a pipe and a plate material according to item 2 above.

  [4] The method for joining a pipe and a plate material according to the above item 2 or 3, wherein a concave portion extending in the axial direction of the die is provided at a portion corresponding to each flat wall portion of the pipe on the outer peripheral surface of the die.

  [5] Any one of the preceding items 1 to 4 in which expansion processing is performed in a state in which bending of the plate material is prevented by sandwiching the plate material from both sides in the thickness direction between the regulating member and the bending prevention member that prevents the bending of the plate material. The method of joining the described pipe and plate material.

  [6] The method for joining a pipe and a plate material according to any one of the preceding items 1 to 5, wherein a concave portion or a convex portion is provided on a contact surface with the seat portion of the regulating member.

  [7] On the outer peripheral surface of the die, two pressing protrusions are provided to locally bulge at least a part of the vicinity of both sides in the axial direction of the insertion portion into the insertion hole of the pipe. The joining method of the pipe and board | plate material in any one of -6.

  [8] A joined structure of a pipe and a plate obtained by the joining method according to any one of 1 to 7 above.

[9] In a state where the pipe is inserted into the insertion hole provided in the plate member, at least a part of the expansion processing target portion including the insertion portion into the insertion hole of the pipe and the vicinity in the axial direction is expanded. By this, a pipe and plate joined structure in which the plate is joined to the pipe,
A short cylindrical seat protrudes in the axial direction of the pipe and is provided integrally with the peripheral edge of the plate material insertion hole,
A joining structure characterized in that a plate material is joined to a pipe in a state where a seat portion of the plate material is polymerized on the outer peripheral surface of the pipe.

[10] The cross-sectional shape of the pipe is a polygonal shape, and the cross-sectional shape of each corner of the pipe is a substantially arc shape,
10. The joined structure according to item 9, wherein the cross-sectional shape of the plate material insertion hole is a shape corresponding to the cross-sectional shape of the pipe.

  [11] The joined structure according to item 10, wherein the amount of bulging outward of the corner portion of the insertion portion into the insertion hole of the pipe is larger than the amount of bulging outward of the flat wall portion of the insertion portion.

  [12] The joined structure according to any one of the above items 9 to 11, wherein the seat portion of the plate member and the insertion portion of the pipe into the insertion hole are bulged outward in a polymerized state or recessed inward.

  [13] The joined structure according to any one of the preceding items 9 to 12, wherein at least a part of the portion in the vicinity of both axial sides of the insertion portion into the insertion hole of the pipe locally bulges outward.

[14] The pipe is inserted into the insertion hole provided in the plate material, and a short cylindrical seat portion integrally provided so as to protrude in the axial direction of the pipe at the peripheral portion of the plate material insertion hole is formed on the outer peripheral surface of the pipe. A joining device that joins a plate material to a pipe by expanding at least a part of the portion to be expanded consisting of an insertion portion into the insertion hole of the pipe and portions near both sides in the axial direction in a state of being arranged in a superposed state. There,
An expanding die arranged in a hollow part of the pipe and divided into a plurality in the circumferential direction;
An expanding mandrel that moves each die segment of the die radially outward of the pipe;
An apparatus for joining a pipe and a plate material, comprising: a regulating member that is disposed outside the seat portion of the plate material and regulates a bulge amount to the outside of the seat portion during expansion processing.

[15] The cross-sectional shape of the pipe is a polygonal shape, and the cross-sectional shape of each corner of the pipe is a substantially arc shape,
The cross-sectional shape of the plate material insertion hole is a shape corresponding to the cross-sectional shape of the pipe,
The die is divided at a position corresponding to each flat wall portion of the pipe,
15. The joining device according to item 14, wherein each die segment of the die is moved outward in the radial direction of the pipe toward each corner of the pipe by a mandrel.

  [16] The joining device according to item 15 above, wherein a concave portion extending in the axial direction of the die is provided at a portion corresponding to each flat wall portion of the pipe on the outer peripheral surface of the die.

[17] An anti-bending member for preventing the bending of the plate material is provided,
17. The joining device according to any one of the above items 14 to 16, wherein the bending preventing member prevents the bending of the plate material by sandwiching the plate material from both sides in the thickness direction between the regulating member and the bending preventing member during the expanding process.

  [18] The joining device according to any one of items 14 to 17, wherein a concave portion or a convex portion is provided on a contact surface of the regulating member with the seat portion.

  [19] The above item 14 is provided with two pressing protrusions on the outer peripheral surface of the die for locally bulging at least a part of the vicinity of both sides in the axial direction of the insertion portion into the insertion hole of the pipe. The joining apparatus in any one of -18.

  The present invention has the following effects.

  In this specification, in a joined structure in which a plate material is joined to a pipe, the joining strength of the plate material against the load in the circumferential direction of the pipe is referred to as “torsional strength”. Moreover, the joining strength of the plate material with respect to the axial load of the pipe is referred to as “pullout strength”.

  In the invention of [1], since the short cylindrical seat protrudes in the axial direction of the pipe and is integrally provided at the peripheral portion of the insertion hole of the plate, the seat of the plate is superposed on the outer peripheral surface of the pipe. By arranging in, the contact area between the plate material and the pipe increases. Thereby, the joining strength of a board | plate material can be increased.

  Furthermore, since the expanding process is performed in a state where the amount of bulging to the outside of the seat portion is regulated by the regulating member arranged outside the seat portion of the plate material, it is not necessary to set the thickness of the plate material to be thick. Therefore, it is possible to reduce the weight of the bonded structure.

  In the invention of [2], since the cross-sectional shape of the pipe is a polygonal shape and the cross-sectional shape of the insertion hole of the plate material is a shape corresponding to the cross-sectional shape of the pipe, the pipe is inserted into the insertion hole of the plate material. Torsional strength is improved. Accordingly, even if a load in the circumferential direction of the pipe is applied to the plate material, the plate material is difficult to move in the circumferential direction of the pipe.

  In addition, each die segment of the die is expanded outward by moving the pipe radially outward toward each corner of the pipe, so that each corner of the pipe is expanded more than each flat wall. Processed and bulges outward. Therefore, the torsional strength is further improved.

  In addition, since the cross-sectional shape of each corner of the pipe is formed in a substantially arc shape, it is possible to reliably prevent stress from concentrating on each corner of the pipe when the circumferential load of the pipe is applied to the plate material. it can. Therefore, strength reliability is improved.

  In the invention of [3], the regulating member is provided outside the seat portion of the plate member, and the gap between the regulating member and the corner portion of the seat portion is larger than the gap between the regulating member and the flat wall portion of the seat portion. In this state, by performing the expanding process, each corner portion of the pipe can surely bulge larger than each flat wall portion. Therefore, the torsional strength is further improved.

  In the invention of [4], the concave portion extending in the axial direction of the die is provided in a portion corresponding to each flat wall portion of the pipe on the outer peripheral surface of the die, so that the outer peripheral surface of the die segment of the die is the pipe. The area in contact with the inner peripheral surface can be reduced. Therefore, the frictional force between the outer peripheral surface of the die segment and the inner peripheral surface of the pipe can be reduced during the expansion process. As a result, each corner of the pipe can be bulged more reliably than each flat wall, and the force required for expanding can be reduced.

  In the invention of [5], bending of the plate material can be prevented during the expansion process.

  In the invention of [6], since the concave portion or the convex portion is provided on the contact surface of the regulating member with the seat portion, the portion to be inserted into the insertion hole of the seat portion and the pipe (that is, the object to be expanded) by the expanding process. Can be bulged outward or recessed inward. When the restricting member is removed after the expanding process, the seat portion of the plate material and the insertion portion into the insertion hole of the pipe are engaged with each other, so that the bonding strength of the plate material can be further improved.

  In the invention of [7], two pressing projections are provided on the outer peripheral surface of the die so as to locally bulge at least a part of the vicinity of both sides in the axial direction of the insertion portion into the insertion hole of the pipe. Therefore, by performing the expanding process using this die, at least a part of the portion in the vicinity of both sides in the axial direction of the insertion portion into the insertion hole of the pipe is locally and reliably expanded. Is bulged. Therefore, the pull-out strength is reliably improved. Therefore, even if a load in the axial direction of the pipe is applied to the plate material, the plate material is difficult to move in the axial direction of the pipe.

  In the invention of [8], a lightweight joint structure can be provided.

  The invention [9] has the same effects as the invention [1].

  The invention [10] has the same effect as the invention [2].

  In the invention of [11], the amount of bulging outward of the corner portion of the insertion portion into the insertion hole of the pipe is larger than the amount of bulging outward of the flat wall portion of the insertion portion. Further improvement.

  In the invention of [12], the joint strength of the plate material is further improved because the seat portion of the plate material and the insertion portion into the insertion hole of the pipe are bulged outwardly or recessed inward. .

  In the invention of [13], at least a part of the portion in the vicinity of both sides in the axial direction of the insertion portion into the insertion hole of the pipe locally bulges outward, so that the pull-out strength is reliably improved.

  According to the invention [14], a joining apparatus suitably used in the joining method according to the invention [1] can be provided.

  According to the invention [15], it is possible to provide a joining apparatus suitably used for the joining method according to the invention [2].

  According to the invention [16], it is possible to provide a joining apparatus suitably used for the joining method according to the invention [4].

  In the invention of [17], a joining apparatus suitably used in the joining method according to the invention of [5] can be provided.

  According to the invention [18], a joining apparatus suitably used for the joining method according to the invention [6] can be provided.

  In the invention [19], a joining apparatus suitably used in the joining method according to the invention [7] can be provided.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1-12 is a figure explaining the joining method and joining apparatus which concern on 1st Embodiment of this invention.

  1-4, (A1) is a joined structure obtained by the joining method according to the first embodiment. The joined structure (A1) is configured by joining a pipe (1) and a plate material (5) to each other.

  The pipe (1) has a quadrangular cross section, and the pipe (1) has a hollow section (3) having a quadrangular cross section extending in the axial direction.

  The pipe (1) includes four flat wall portions (1a) (1a) (1a) (1a) extending in the axial direction and arranged in the circumferential direction, and two flat wall portions (1a) (1a) adjacent to each other. ) Between the corners (1b). The cross-sectional shape of each corner (1b) is formed in an arc shape having a predetermined radius of curvature.

  The pipe (1) is made of a material that can be elastically deformed and plastically deformed, for example, a metal, and more specifically, aluminum or an aluminum alloy. However, in the present invention, the material of the pipe (1) is not limited to aluminum or an aluminum alloy. In addition, for example, a metal such as iron, steel, copper, or the like may be used. May be. Moreover, the pipe (1) may be made of, for example, an extruded material, or may be manufactured by other methods.

  A board | plate material (5) is used as a flange attached to another member, for example. This plate member (5) has a substantially rectangular shape in plan view, and further has four projecting pieces (5a) (5a) (5a) (5a) protruding outward from each side of the plate member (5). is doing. A fastener insertion hole such as a bolt insertion hole (5b) is provided at the tip of each protruding piece (5a). However, in the present invention, the plate member (5) is not limited to being used as a flange, and may have, for example, a bracket or a stay, or may be used for other purposes. It may be a thing.

  An insertion hole (6) through which the pipe (1) is inserted is provided at the center of the plate material (5). The cross-sectional shape of the insertion hole (6) is a shape corresponding to the cross-sectional shape of the pipe (1), that is, a quadrangular shape. Here, since the cross-sectional shape of each corner | angular part (1b) of a pipe (1) is formed in circular arc shape as mentioned above, the cross-sectional shape of each corner | angular part of the insertion hole (6) of a board | plate material (5) is Corresponding to the cross-sectional shape of each corner (1b) of the pipe (1), it is formed in an arc shape.

  Further, on the peripheral portion of the insertion hole (6) of the plate member (5), a seat portion (8) having a short rectangular tube shape (in detail, a short rectangular tube shape) is provided to surround the insertion hole (6). It is integrally formed so as to protrude to one side in the axial direction of 1).

  This seat portion (8) is press-bended into a short tube shape so that the peripheral edge portion of the insertion hole (6) of the plate member (5) protrudes to one side in the axial direction of the pipe (1) over the entire circumference. It is formed by processing. That is, the seat portion (8) is formed to be bent so as to protrude from the peripheral portion of the insertion hole (6) of the plate member (5) to one side in the axial direction of the pipe (1). Accordingly, the seat (8) is formed along the entire circumference of the peripheral edge of the insertion hole (6) of the plate member (5), and the cross-sectional shape of the hollow portion inside the seat (8). Is the same as the cross-sectional shape of the insertion hole (6), that is, a quadrangular shape. Moreover, this seat part (8) is arrange | positioned in the superposition | polymerization state on the outer peripheral surface of a pipe (1) at the time of an expand process.

  Since this seat part (8) is formed in the shape of a short square cylinder, four flat wall parts (8a) (8a) (8a) (8a) arranged in the circumferential direction are adjacent to each other. And a corner portion (8b) interposed between the flat wall portions (8a) and (8a). The cross-sectional shape of each corner portion (8b) of the seat portion (8) is an arc shape corresponding to the cross-sectional shape of each corner portion (1b) of the pipe (1), similarly to the corner portion of the insertion hole (6). Is formed.

  The plate member (5) and its seat (8) are made of an elastically deformable material, for example, a metal, and more specifically, aluminum or an aluminum alloy. However, in the present invention, the material of the plate material (5) is not limited to aluminum or an aluminum alloy. In addition, for example, a metal such as iron, steel, copper, or the like may be used. May be. Moreover, although this board | plate material (5) and its seat part (8) are manufactured by press molding, in this invention, you may be manufactured by an extrusion process or die-casting other than that, for example. It may be manufactured by other methods.

  The length of the pipe (1) is, for example, in the range of 50 to 2000 mm. The length of each side in the cross section of the pipe (1) is, for example, in the range of 20 to 100 mm. The curvature radius of each corner | angular part (1b) of a pipe (1) exists in the range of 5-45 mm, for example. The thickness of the flat wall portion (1a) and the corner portion (1b) as the peripheral wall portion of the pipe (1) is, for example, in the range of 0.5 to 5 mm.

  However, in this invention, each dimension of a pipe (1) is not limited to being in said range, It sets variously according to a use purpose and a use.

  The length of each side of the plate material (5) is, for example, in the range of 30 to 150 mm. The thickness of the plate (5) and its seat (8) is in the range of 2 to 5 mm, for example. The protruding length of the seat portion (8) (that is, the length along the axial direction of the pipe (1) of the seat portion (8)) is, for example, in the range of 5 to 20 mm. The length of each side in the cross section of the insertion hole (6) of the plate member (5) is set to be, for example, 0.1 to 1 mm larger than the length of each side in the cross section of the pipe (1). The radius of curvature of each corner of the insertion hole (6) of the plate (5) is, for example, in the range of 5.1 to 47 mm.

  However, in this invention, each dimension of a board | plate material (5) and its seat part (8) is not limited to being in said range, It is set variously according to a use purpose and a use. .

  In the joint structure (A1) of the first embodiment, as shown in FIGS. 1 to 4, the pipe (1) is inserted into the insertion hole (6) of the plate material (5) and the plate material (5) In a state where the seat portion (8) is superposed on the outer peripheral surface of the pipe (1), the insertion portion (2a) into the insertion hole (6) of the pipe (1) and its axially adjacent portions (2b) (2b) The plate material (5) is joined to the pipe (1) by partially expanding (expanding) a part of the expansion processing target portion (2) consisting of

  In this joint structure (A1), the part of the expanded pipe (1) will be described in detail as follows.

  Of the expansion processing target part (2) of the pipe (1), each corner (1b) of the insertion part (2a) into the insertion hole (6) of the pipe (1) and the axis of the insertion part (2a) Each corner part (1b) of the direction both sides vicinity part (2b) (2b) is locally expanded (refer FIGS. 1-3). Furthermore, each corner | angular part (1b) of this insertion part (2a) is locally expanded, Each corner | angular part (8b) of the seat part (8) of a board | plate material (5) is pushed outside, and is locally Bulges (see FIGS. 1 and 2). In these drawings, (B) is a bulging portion (that is, an expanded portion) formed by expanding in the pipe (1) of the joined structure (A1). On the other hand, the width direction intermediate part of each flat wall part (1a) of the insertion part (2a) into the insertion hole (6) of the pipe (1), and the axially both sides vicinity part (2b) of this insertion part (2a) The flat wall portion (1a) of (2b) is not expanded in any way with the intermediate portion in the width direction. Therefore, in this joint structure (A1), the amount of bulging outward of each corner portion (1b) of the insertion portion (2a) into the insertion hole (6) of the pipe (1) (that is, expansion by expansion processing). The amount of protrusion (hereinafter the same) is more than the amount of bulging outward of each flat wall portion (1a) of the insertion portion (2a) (more specifically, the intermediate portion in the width direction of each flat wall portion (1a)). It is getting bigger. Further, the amount of bulging outward of each corner portion (1b) of the axially adjacent portions (2b) (2b) of the insertion portion (2a) into the insertion hole (6) of the pipe (1) is It is larger than the outward bulge amount of each flat wall portion (1a) (more specifically, the intermediate portion in the width direction of each flat wall portion (1a)) in the vicinity portion (2b) (2b).

  Moreover, in this joining structure (A1), it forms in each corner | angular part (1b) of the axial direction both sides vicinity (2b) (2b) of the insertion part (2a) into the penetration hole (6) of a pipe (1). The seat portion (8) of the plate member (5) is sandwiched between the two bulged portions (B) and (B).

  The maximum height of the bulging part (B) formed in the pipe (1) is in the range of 1 to 5 mm, for example, and the width of the bulging part (B) is in the range of 5 to 20 mm, for example. However, in the present invention, the height and width of the bulging portion (B) are not limited to being within the above range.

  Next, the structure of the joining apparatus (10) based on 1st Embodiment of this invention which joins a pipe (1) and a board | plate material (5) is demonstrated below.

  As shown in FIGS. 5 to 9, the joining apparatus (10) includes an expanding die (11) and a mandrel (18), and further includes a regulating member (30).

  As shown in FIGS. 8 and 9, the mandrel (18) has a wedge part (19) made of, for example, tool steel or cemented carbide. The wedge portion (19) is formed in a tapered conical shape (in detail, a truncated cone shape) at the tip of the mandrel (18). Therefore, the cross-sectional shape of this wedge part (19) is circular. A drive source (not shown) for moving the mandrel (18) in the axial direction is connected to the base end of the mandrel (18). As this drive source, for example, a fluid pressure cylinder such as a hydraulic cylinder is used.

  As shown in FIGS. 6 to 9, the die (11) is disposed in the hollow portion (3) of the pipe (1), and the expanding target portion (2) of the pipe (1) is moved outward. Press to bulge. The die (11) is made of, for example, tool steel or cemented carbide. A wedge hole portion (14) corresponding to the wedge portion (19) of the mandrel (18) is provided in the central portion of the die (11) so as to penetrate in the axial direction of the die (11). The wedge hole portion (14) is a tapered hole, and the cross-sectional shape of the wedge hole portion (14) is a shape corresponding to the cross-sectional shape of the wedge portion (19) of the mandrel (18), that is, a circular shape. is there.

  Furthermore, as shown in FIG. 6, this die (11) is divided into a plurality of parts in the circumferential direction centered on the wedge hole (14). More specifically, the die (11) is divided at a position corresponding to the intermediate portion in the width direction of each flat wall portion (1a) of the pipe (1) with the wedge hole portion (14) as the center. The number of divisions of the die (11) is the same as the number of corners (1b) (or flat wall portions (1a)) of the pipe (1), that is, four. Therefore, this die (11) is constituted by combining four die segments (11a) (11a) (11a) (11a).

  Furthermore, as shown in FIG. 6, it corresponds to each flat wall portion (1a) of the pipe (1) on the outer peripheral surface of the die (11) (more specifically, the intermediate portion in the width direction of each flat wall portion (1a)). The portion to be provided is provided with a concave strip portion (15) having a U-shaped cross section (or U shape) extending in the axial direction of the die (11). Thereby, the area which the outer peripheral surface of each die segment (11a) of die | dye (11) contacts the inner peripheral surface of a pipe (1) at the time of an expanding process is reducing.

  Further, as shown in FIGS. 8 and 9, two axially protruding pressure projections (12) spaced apart from each other in the axial direction are provided in the circumferential direction in the axially intermediate portion of the outer peripheral surface of the die (11). It is extended. Both pressing projections (12) and (12) press outwardly at least a part of the portions (2b) and (2b) in the vicinity of both axial sides of the insertion portion (2a) into the insertion hole (6) of the pipe (1). Thus, the cross section is bulged locally in an arc shape. Here, in this 1st Embodiment, as mentioned above, the recessed strip part (15) is provided in the site | part corresponding to each flat wall part (1a) of the pipe (1) in the outer peripheral surface of die | dye (11). Therefore, the pressing protrusions (12) are connected to the corners (1b) of the adjacent portions (2b) (2b) in the axial direction on both sides of the insertion portion (2a) into the insertion hole (6) of the pipe (1). Is bulged locally on the outside. On the other hand, the flat wall portions (1a) of the both neighboring portions (2b) and (2b) are not bulged by the pressing convex portions (12).

  The protruding height of the pressing convex portion (12) is set within a range of 1 to 5 mm, for example, and the width of the pressing convex portion (12) is set within a range of, for example, 4 to 10 mm. However, in this invention, the protrusion height and width | variety of a press convex part (12) are not limited to being in said range.

  Furthermore, the diameter of the site | part (13) between both press convex parts (12) (12) of die | dye (11) is set larger than the diameter of the axial direction both ends of die | dye (11). This site | part (13) bulges locally the insertion part (2a) to the insertion hole (6) of a pipe (1) outside. Here, in this 1st Embodiment, as mentioned above, the recessed strip part (15) is provided in the site | part corresponding to each flat wall part (1a) of the pipe (1) in the outer peripheral surface of die | dye (11). Therefore, this part (13) bulges each corner | angular part (1b) of the insertion part (2a) of a pipe (1) locally outside. On the other hand, each flat wall portion (1a) of the insertion portion (2a) is not bulged or hardly bulged by this portion (13).

  The mandrel (18) is inserted into the wedge hole portion (14) of the die (11) disposed in the hollow portion (3) of the pipe (1) by inserting the wedge portion (19) of the die (11). Each die segment (11a) is moved radially outward of the pipe (1) toward each corner (1b) of the pipe (1).

  In the present invention, the cross-sectional shape of the wedge portion (19) of the mandrel (18) and the cross-sectional shape of the wedge hole portion (14) of the die (11) are each circular as shown in this embodiment. In addition, for example, it may be a polygonal shape such as a square shape, or may be a shape similar to the cross-sectional shape of the pipe (1) or the hollow portion (3) thereof.

  As shown in FIGS. 5 and 6, the regulating member (30) is disposed outside the seat portion (8) of the plate member (5) so as to surround the seat portion (8) over the entire circumference. The amount of swelling of the plate (5) to the outside of the seat (8) during processing is restricted to a predetermined amount over the entire circumference of the seat (8).

  The regulating member (30) is annular, and the seat (8) of the plate material (5) is disposed inside thereof. The restricting member (30) is divided into a plurality of parts in the circumferential direction. (31) is a dividing part of the regulating member (30). In the first embodiment, the number of divisions of the regulating member (30) is four. And when this restricting member (30) is expanded, the four restricting member segments (30a) are combined and integrated so that the seat portion (8) of the plate member (5) is disposed inside thereof. Thus, it is arranged at a position that regulates the amount of bulging outward of the seat portion (8). As means for integrating the four regulating member segments (30a), fastening with bolts, fastening with a press, or the like is used.

  In the present invention, the number of divisions of the regulating member (30) is not limited to four, and may be two, three, five or more, for example. Alternatively, the regulating member (30) may be not divided.

  The regulating member (30) has such strength that the regulating member (30) does not deform when a load is applied to the regulating member (30) during the expansion process, and is made of, for example, tool steel.

  The thickness of the restricting member (30) (that is, the length along the pipe (1) axial direction of the restricting member (30)) is, for example, 0. 0 relative to the protruding length of the seat (8) of the plate member (5). It is set within the range of 8 to 1.2 times. However, in the present invention, the thickness of the regulating member (30) is not limited to being within the above range.

  As shown in FIG. 7, in the state arrange | positioned on the outer side of the seat part (8) of a board | plate material (5), this regulation member (30) is each corner | angular part (30) of a regulation member (30) and a seat part (8) ( 8b) is set to be larger than the gap (C1) between the regulating member (30) and each flat wall portion (8a) of the seat (8). (Ie, C2> C1).

  The clearance (C2) between the regulating member (30) and each corner (8b) of the seat (8) is set, for example, within a range of 1.1 to 5 mm. On the other hand, the gap (C1) between the regulating member (30) and each flat wall portion (8a) of the seat portion (8) is set within a range of 0.1 to 1 mm, for example. However, in this invention, each clearance gap (C1) (C2) is not limited to being in said range.

  Next, a method for joining the pipe (1) and the plate material (5) using the joining device (10) will be described below.

  First, as shown in FIGS. 5 to 9, the pipe (1) is inserted into the insertion hole (6) of the plate member (5) in a loosely inserted state, and the seat (8) of the plate member (5) is connected to the pipe ( It arrange | positions in the superposition | polymerization state on the outer peripheral surface of 1). Further, the four restricting member segments (30a) are combined and integrated with each other so that the seat (8) of the plate member (5) is disposed inside the restricting member (30). ) Is disposed outside the seat (8) of the plate (5) so as to surround the seat (8) over the entire circumference. By disposing the regulating member (30) in this way, the amount of bulging outward of the seat (8) is regulated to a predetermined amount over the entire circumference of the seat (8). That is, as shown in FIG. 7, the gap (C2) between the restricting member (30) and each corner (8b) of the seat (8) is different between the restricting member (30) and the seat (8). It is set to be larger than the gap (C1) between the flat wall portion (8a) (that is, C2> C1).

  Further, the die (11) is arranged at a position corresponding to the plate material (5) in the hollow portion (3) of the pipe (1).

  Next, as shown in FIGS. 8 and 9, the mandrel (18) is disposed in the hollow portion (3) of the pipe (1) in parallel with the axial direction of the pipe (1). By moving the wedge portion (19) in the axial direction of the mandrel (18), the wedge portion (19) is inserted into the wedge hole portion (14) of the die (11). Thereby, as shown in FIGS. 10 to 12, each die segment (11a) of the die (11) is moved outward in the radial direction of the pipe (1) toward each corner (1b) of the pipe (1). Expansion processing (expanding) a part of the expanded portion (2) consisting of the insertion portion (2a) into the insertion hole (6) of the pipe (1) and the axially adjacent sides (2b) (2b). Processing).

  By this expanding process, among each flat wall portion (1a) and each corner portion (1b) of the insertion portion (2a) into the insertion hole (6) of the pipe (1), particularly each corner portion (1b), Of the flat wall portions (1a) and corner portions (1b) of the adjacent portions (2b) and (2b) in the axial direction both sides of the insertion portion (2a), particularly the corner portions (1b) are locally expanded outward. Each die segment (11a) (more specifically, both pressing projections (12), (12), etc.) is pushed and plastically deformed so as to come out. Furthermore, the seat portion (8) of the plate member (5) is pushed outward by the insertion portion (2a) into the insertion hole (6) of the pipe (1) thus bulging outward. Among the flat wall portions (8a) and the corner portions (8b) of the seat portion (8), the corner portions (8b) are elastically deformed so that the corner portions (8b) bulge outward. As the seat portion (8) is elastically deformed in this way, an elastic restoring force is accumulated in the seat portion (8). And while the seat part (8) bulges outside in the elastic region, each flat wall part (8a) and each corner part (8b) of the seat part (8) collide with the regulating member (30). By doing so, the bulging of each flat wall portion (8a) and each corner portion (8b) of the seat portion (8) is stopped, respectively, thereby each flat wall portion (8a) and each corner of the seat portion (8). The amount of swelling to the outside of the portion (8b) is restricted. Therefore, each flat wall part (8a) and each corner | angular part (8b) of a seat part (8) bulge outside in an elastic region.

  Next, the wedge part (19) of the mandrel (18) is extracted from the wedge hole part (14) of the die (11). Then, due to the elastic restoring force (spring back force) accumulated in the seat portion (8) of the plate member (5), the seat portion (8) is externally fitted to the pipe (1) on the outer peripheral surface of the pipe (1). It is pressure-fixed to the state. Thereby, the plate member (5) is joined to the pipe (1) (specifically, the outer peripheral surface of the pipe (1)).

  Next, the desired joining structure (A1) shown in FIG. 1 is obtained by removing the regulating member (30).

  Thus, the bonding method of the first embodiment has the following advantages.

  A short cylindrical tube seat (8) protrudes from one side in the axial direction of the pipe (1) and is provided integrally with the peripheral edge of the insertion hole (6) of the plate (5). By arranging the seat portion (8) in a superposed state on the outer peripheral surface of the pipe (1), the contact area between the plate material (5) and the pipe (1) is increased. Thereby, the joining strength of a board | plate material (5) can be increased.

  Further, since the expanding process is performed in a state where the amount of bulging to the outside of the seat portion (8) is regulated by the regulating member (30) arranged outside the seat portion (8) of the plate material (5), the plate material ( It is not necessary to set the thickness of 5) to be thick, that is, it is not necessary to make the rigidity of the plate (5) higher than the rigidity of the pipe (1). Therefore, it is possible to reduce the weight of the bonded structure (A1).

  Furthermore, the cross-sectional shape of the pipe (1) is a square shape, and the cross-sectional shape of the insertion hole (6) of the plate member (5) is a shape corresponding to the cross-sectional shape of the pipe (1) (that is, a square shape). In a state where (1) is inserted into the insertion hole (6) of the plate (5), the torsional strength is improved. Therefore, even if the circumferential load of the pipe (1) is applied to the plate (5), the plate (5) is difficult to move in the circumferential direction of the pipe (1).

  Furthermore, since the cross-sectional shape of each corner | angular part (1b) of a pipe (1) is formed in circular arc shape, when the load of the circumferential direction of a pipe (1) is added to the board | plate material (5), a pipe (1) It is possible to reliably prevent stress from concentrating on each corner (1b). Therefore, strength reliability is improved.

  Further, since each die segment (11a) of the die (11) is moved radially outward of the pipe (1) toward each corner (1b) of the pipe (1), the expanding process is performed. Each corner (1b) of (1) is expanded more intensively than each flat wall (1a) and bulges outward greatly. Therefore, the torsional strength is further improved.

  Furthermore, on the outside of the seat (8) of the plate member (5), there is a restriction member (30), and a gap (C1) between the restriction member (30) and each corner (8b) of the seat (8). Since it arrange | positions so that it may become larger than the clearance gap (C2) between each flat wall part (8a) of a control member (30) and a seat part (8), and an expand process is performed in this state, pipe (1) Each of the corner portions (1b) can surely bulge larger than the respective flat wall portions (1a). Therefore, the torsional strength is further improved. Further, in the joined structure (A2) thus obtained, the amount of bulging outward of each corner (1b) of the insertion portion (2a) into the insertion hole (6) of the pipe (1) is the insertion amount. Since it is larger than the bulging amount of each portion (2a) to the outside of each flat wall portion (1a), the torsional strength is further improved.

  Furthermore, since the concave part (15) extended in the axial direction of die | dye (11) is provided in the site | part corresponding to each flat wall part (1a) of the pipe (1) in the outer peripheral surface of die | dye (11). The area where the outer peripheral surface of each die segment (11a) of the die (11) contacts the inner peripheral surface of the pipe (1) can be reduced. Therefore, the frictional force between the outer peripheral surface of the die segment (11a) and the inner peripheral surface of the pipe (1) can be reduced during the expanding process. As a result, each corner (1b) of the pipe (1) can be swelled more reliably than each flat wall (1a), and the force required for the expanding process can be reduced.

  Further, on the outer peripheral surface of the die (11), a part of the portions (2b) and (2b) in the vicinity of both axial sides of the insertion portion (2a) into the insertion hole (6) of the pipe (1) (that is, each corner portion ( 1b)) is provided with two pressing projections (12) and (12) that locally bulge outward, so that the pipe (1) can be expanded by performing an expanding process using this die (11). A portion of each of the adjacent portions (2b) and (2b) in the axial direction of the insertion portion (2a) into the insertion hole (6a) (that is, each corner portion (1b)) bulges locally and reliably. . Therefore, the pull-out strength is reliably improved. Therefore, even if a load in the axial direction of the pipe (1) is applied to the plate material (5), the plate material (5) is difficult to move in the axial direction of the pipe (1).

  13-20 is a figure explaining the joining method and joining apparatus which concern on 2nd Embodiment of this invention. The joining method and joining apparatus according to the second embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIG. 13, in the joint structure (A2) of the second embodiment, the pipe (1) is inserted into the insertion hole (6) of the plate (5) and the seat of the plate (5). In a state where (8) is superposed on the outer peripheral surface of the pipe (1), the insertion part (2a) into the insertion hole (6) of the pipe (1) and its axially both side neighboring parts (2b) (2b) The expansion processing target part (2) made of is locally expanded, so that the plate (5) is joined to the pipe (1). That is, the entire circumferential direction of the insertion portion (2a) into the insertion hole (6) of the pipe (1) and the entire circumferential direction of the axially opposite side portions (2b) (2b) of the insertion portion (2a). Are locally expanded (see FIGS. 18 to 20).

  Moreover, in this joining structure (A2), the amount of bulging to the outside of each corner (1b) of the insertion portion (2a) into the insertion hole (6) of the pipe (1) is the insertion portion (2a). ) Of the flat wall portion (1a) to the outside.

  Next, the configuration of the bonding apparatus according to the second embodiment will be described below with a focus on differences from the bonding apparatus according to the first embodiment.

  In this joining apparatus (10), as shown in FIG. 15, in the part corresponding to the width direction middle part of each flat wall part (1a) of the pipe (1) on the outer peripheral surface of the expanding die (11), The concave portion (see FIG. 6, 15) extending in the axial direction of the die (11) is not provided.

  Moreover, as shown in FIGS. 15-17, in the state arrange | positioned on the outer side of the seat part (8) of a board | plate material (5), the regulation member (30) of a regulation member (30) and a seat part (8). The gap (C2) between each corner (8b) is set to be the same as the gap (C1) between the regulating member (30) and each flat wall (8a) of the seat (8). (Ie, C2 = C1). The gaps (C1) and (C2) are set within a range of 0.1 to 1 mm, for example. However, in the present invention, the gaps (C1) and (C2) are not limited to being within the above range. Moreover, the division | segmentation number of a control member (30) is two pieces.

  In the present invention, the gap (C2) between the regulating member (30) and each corner (8b) of the seat (8) is the same as in the first embodiment described above. It may be set to be larger than the gap (C1) between each flat wall portion (8a) in (8) (that is, C2> C1).

  Next, a method of joining the pipe (1) and the plate material (5) using the joining device (10) will be described below with a focus on differences from the joining method of the first embodiment.

  In this joining method, as shown in FIGS. 18 to 20, the entire circumferential direction of the insertion portion (2a) into the insertion hole (6) of the pipe (1) and the insertion portion (2a) are expanded by expanding. The axially adjacent portions (2b) and (2b) in the circumferential direction are pushed and plastically deformed by the die segments (11a) of the die (11) so as to locally bulge outward. Furthermore, the seat portion (8) of the plate member (5) is pushed outward by the insertion portion (2a) into the insertion hole (6) of the pipe (1) thus bulging outward. The seat (8) is elastically deformed so as to bulge outward. As the seat portion (8) is elastically deformed in this way, an elastic restoring force is accumulated in the seat portion (8). And while the seat part (8) bulges outside in the elastic region, the seat part (8) abuts against the regulating member (30), so that the bulge of the seat part (8) is stopped. This restricts the amount of bulging outward of the seat (8). Therefore, the seat (8) bulges outward in the elastic region.

  Next, the wedge part (19) of the mandrel (18) is extracted from the wedge hole part (14) of the die (11). Then, the seat (8) is externally fitted to the pipe (1) on the outer peripheral surface of the pipe (1) by the elastic restoring force (spring back force) accumulated in the seat (8) of the plate member (5). It is fixed by pressure. Thereby, the plate member (5) is joined to the pipe (1) (specifically, the outer peripheral surface of the pipe (1)).

  Next, the desired joined structure (A2) shown in FIG. 13 is obtained by removing the regulating member (30).

  FIGS. 21 to 26 are views for explaining a bonding method and a bonding apparatus according to the third embodiment of the present invention. The joining method and joining apparatus according to the third embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIG. 21, in the joint structure (A3) of the third embodiment, the cross-sectional shape of the pipe (1) is circular. The cross-sectional shape of the insertion hole (6) of the plate member (5) is a shape corresponding to the cross-sectional shape of the pipe (1), that is, a circular shape. In addition, a short cylindrical seat portion (8) is provided integrally with the peripheral portion of the insertion hole (6) of the plate member (5) so as to protrude to one side in the axial direction of the pipe (1).

  In this joined structure (A3), the pipe (1) is inserted into the insertion hole (6) of the plate (5), and the seat (8) of the plate (5) is formed on the outer peripheral surface of the pipe (1). Expanded processing target part (2) consisting of insertion part (2a) into insertion hole (6) of pipe (1) and its axially neighboring parts (2b) and (2b) in a superposed state Is locally expanded, so that the plate (5) is joined to the pipe (1). That is, the entire circumferential direction of the insertion portion (2a) into the insertion hole (6) of the pipe (1) and the entire circumferential direction of the axially opposite side portions (2b) (2b) of the insertion portion (2a). And are locally expanded.

  Next, the configuration of the bonding apparatus according to the second embodiment will be described below with a focus on differences from the bonding apparatus according to the first embodiment.

  In this joining apparatus (10), as shown in FIG. 23, the cross-sectional shape of the expanding die (11) is the same as the cross-sectional shape of the hollow portion (3) of the pipe (1), that is, in a circular shape. is there. The die (11) is equally divided into eight in the circumferential direction around the wedge hole (14). Therefore, this die (11) is constituted by combining eight die segments (11a) with each other. Further, the outer peripheral surface of the die (11) is not provided with a concave strip (see FIG. 6, 15) extending in the axial direction of the die (11).

  Further, as shown in FIGS. 23 and 24, the regulating member (30) is disposed outside the seat (8) of the plate member (5), and the regulating member (30) and the seat (8) Is set to be constant over the entire circumference. This gap (C) is set within a range of 0.1 to 1 mm, for example. However, in the present invention, the gap (C) is not limited to being within the above range.

  Next, a method of joining the pipe (1) and the plate material (5) using the joining device (10) will be described below with a focus on differences from the joining method of the first embodiment.

  In this joining method, as shown in FIG. 25 and FIG. 26, the entire circumferential direction of the insertion portion (2a) into the insertion hole (6) of the pipe (1) and the insertion portion (2a) are expanded by expanding. The axially adjacent portions (2b) and (2b) in the circumferential direction are pushed and plastically deformed by the die segments (11a) of the die (11) so as to locally bulge outward. Furthermore, the seat portion (8) of the plate member (5) is pushed outward by the insertion portion (2a) into the insertion hole (6) of the pipe (1) thus bulging outward. The seat (8) is elastically deformed so as to bulge outward. As the seat portion (8) is elastically deformed in this way, an elastic restoring force is accumulated in the seat portion (8). And while the seat part (8) bulges outside in the elastic region, the seat part (8) abuts against the regulating member (30), so that the bulge of the seat part (8) is stopped. This restricts the amount of bulging outward of the seat (8). Therefore, the seat (8) bulges outward in the elastic region.

  Next, the wedge part (19) of the mandrel (18) is extracted from the wedge hole part (14) of the die (11). Then, the seat (8) is externally fitted to the pipe (1) on the outer peripheral surface of the pipe (1) by the elastic restoring force (spring back force) accumulated in the seat (8) of the plate member (5). It is fixed by pressure. Thereby, a board | plate material (5) is joined to a pipe (1).

  Next, the desired joined structure (A3) shown in FIG. 21 is obtained by removing the regulating member (30).

  FIG. 27 is a view for explaining a bonding method and a bonding apparatus according to the fourth embodiment of the present invention. The joining method and joining apparatus according to the fourth embodiment will be described below with a focus on differences from the first embodiment.

  As shown in the figure, the joining device (10) includes the components of the joining device of the first embodiment (that is, the die (11), the mandrel (18), the regulating member (30), etc.), An anti-bending member (35) for preventing the bending of the plate (5) that may occur during the expanding process is provided. This bend prevention member (35) prevents the bending of the plate (5) by sandwiching the plate (5) from both sides in the thickness direction between the regulating member (30) and the bend prevention member (35) during the expansion process. Is.

  This bending prevention member (35) has rigidity, for example, is made of tool steel.

  In the fourth embodiment, the thickness of the restricting member (30) is set slightly smaller than the protruding length of the seat (8) of the plate (5). Therefore, as shown in the figure, in the state where the restricting member (30) is disposed outside the seat (8) of the plate member (5), the tip (8c) of the seat (8) is the restricting member (30). ) Protrudes to one side in the thickness direction.

  In the joining method using this joining apparatus (10), as shown in the figure, the regulating member (30) disposed outside the seat (8) of the plate (5) and the thickness of the plate (5) By sandwiching the plate material (5) from both sides in the thickness direction with the bending prevention member (35) disposed on the opposite side to the side where the regulating member (30) is present on both sides in the direction, the plate material (5) The expansion process is performed in a state in which the bending is prevented. Other joining procedures are the same as the joining method of the first embodiment.

  In addition, the front-end | tip part (8c) of the seat part (8) of a board | plate material (5) is an axial direction one side vicinity part (2b) of the insertion part (2a) in the insertion hole (6) of a pipe (1) by an expanding process. As the bulge bulges outward, it is slightly bent outward.

  This joining method has an advantage that the bending of the plate (5) can be prevented during the expansion process.

  FIG. 28 is a view for explaining a bonding method and a bonding apparatus according to the fifth embodiment of the present invention.

  In the joining apparatus of the fifth embodiment, the concave portion (32) is formed on the entire circumference in the circumferential direction on the contact surface (regulator surface) of the plate member (5) with the seat portion (8) of the restrict member (30). It is extended and provided. The width of the recess (32) is set, for example, within a range of 5 to 20 mm, and the depth of the recess (32) is set, for example, within a range of 2 to 5 mm. However, in this invention, the width | variety and depth of a recessed part (32) are not limited to being in said range.

  In the joining method using the joining device (10), the seat (8) of the plate member (5) and the insertion hole (6) of the pipe (1) are inserted into the recess (32) of the regulating member (30) by expanding. ) It is deformed so as to enter the part (2a) inserted into the inside in a state of being overlapped with each other, and locally bulges outward in a cross-sectional arc shape. Thereby, both site | parts (8) (2a) mutually engage with the axial direction of a pipe (1).

  This joining method has the following advantages.

  That is, since the concave portion (32) is provided in the contact surface of the regulating member (30), the seat portion (8) of the plate member (5) and the insertion hole (6) of the pipe (1) are obtained by expanding. The insertion portion (2a) can be bulged outwardly in a state of being polymerized with each other. When the restricting member (30) is removed after the expanding process, both the parts (8) and (2a) are engaged with each other in the axial direction of the pipe (1), so that the bonding strength of the plate (5) is further improved. it can.

  FIG. 29 is a view for explaining a bonding method and a bonding apparatus according to the sixth embodiment of the present invention.

  The joining method of the sixth embodiment is basically the same as the joining method of the fifth embodiment, but both sides in the axial direction of the insertion portion (2a) into the insertion hole (6) of the pipe (1). The neighboring portions (2b) and (2b) are not bulged. Other procedures are the same as the joining method of the fifth embodiment.

  FIG. 30 is a view for explaining a bonding method and a bonding apparatus according to the seventh embodiment of the present invention.

  In the joining device (10) of the sixth embodiment, the convex portion (33) is circumferential in the contact surface (regulatory surface) of the restricting member (30) with the seat (8) of the plate member (5). Is provided to extend over the entire circumference. The width of the convex portion (33) is set within a range of 5 to 20 mm, for example, and the height of the convex portion (33) is set within a range of 2 to 5 mm, for example. However, in this invention, the width | variety and height of a convex part (33) are not limited to being in said range.

  The joining method using this joining apparatus (10) has the following advantages.

  That is, by expanding, the axially adjacent portions (2b) and (2b) of both sides in the axial direction of the insertion portion (2a) into the insertion hole (6) of the pipe (1) can be expanded outward, and further, the regulating member ( Since the convex portion (33) is provided on the contact surface of 30), the seat portion (8) of the plate (5) and the insertion portion (2a) into the insertion hole (6) of the pipe (1), In a state where they are superposed on each other, they can be locally recessed in a circular arc shape or the like inside. When the restricting member (30) is removed after the expansion process, both the parts (8) and (2a) are engaged with each other in the axial direction of the pipe (1), so that the bonding strength of the plate (5) can be further improved. .

  Although several embodiments of the present invention have been described above, the present invention is not limited to those shown in the above embodiments, and various setting changes can be made.

  For example, in the present invention, as shown in FIG. 31, a plurality of concave portions (9a) and / or convex portions (9b) are spaced in the circumferential direction on the inner peripheral surface of the seat portion (8) of the plate member (5). May be provided. When this plate member (5) is joined to a pipe (not shown), the insertion portion (2a) into the insertion hole (6) of the pipe (1) is formed into a seat portion of the plate member (5) by expanding. The concave portion (9a) and / or the convex portion (9b) on the inner peripheral surface of (8) is plastically deformed so as to be engaged in the circumferential direction of the pipe (1) and bulges outward. As a result, there is an advantage that the torsional strength of the plate material (5) is further improved.

  Further, in the present invention, the cross-sectional shape of the pipe (1) is not limited to a quadrangular shape, but may be, for example, a triangular shape, a pentagonal shape, a hexagonal shape, a heptagonal shape, or an octagonal shape. good.

  In the present invention, a treatment for reducing the frictional force on at least one of the surface of the wedge portion (19) of the mandrel (18) and the peripheral surface of the wedge hole portion (14) of the die (11), You may perform the process for reducing an abrasion amount. As such a treatment, adhesion of a lubricant, nitriding treatment, hard coating treatment, DLC treatment or the like is used.

  The present invention is used, for example, as a steering material for a vehicle, a steering column holder, a muffler, a frame, a propeller shaft, a suspension arm, other automobile parts, or a product other than an automobile, for example, a piping material or a bicycle part. The present invention can be used for a joining method of a pipe and a plate material and a joining device used in this joining method.

It is a perspective view of the joining structure object of a 1st embodiment of the present invention. It is the XX sectional view taken on the line in FIG. It is the YY sectional view taken on the line in FIG. FIG. 3 is a sectional view taken along line ZZ in FIG. 2. It is a perspective view of the state before expanding the expansion process object part of a pipe in the junction structure. FIG. 6 is a sectional view taken along line XX in FIG. 5. It is an enlarged view of the W part in FIG. It is the YY sectional view taken on the line in FIG. It is the ZZ sectional view taken on the line in FIG. It is sectional drawing corresponding to FIG. 2 in the state which expanded the expansion process object part of the pipe in the junction structure. It is the YY sectional view taken on the line in FIG. It is the ZZ sectional view taken on the line in FIG. It is a perspective view of the joining structure object of a 2nd embodiment of the present invention. It is a perspective view of the state before expanding the expansion process object part of a pipe in the junction structure. It is the XX sectional view taken on the line in FIG. It is the YY sectional view taken on the line in FIG. It is the ZZ sectional view taken on the line in FIG. FIG. 16 is a cross-sectional view corresponding to FIG. 15 in a state in which an expansion processing target portion of the pipe is expanded in the joint structure. It is the YY sectional view taken on the line in FIG. It is the ZZ sectional view taken on the line in FIG. It is a perspective view of the joining structure object of a 3rd embodiment of the present invention. It is a perspective view of the state before expanding the expansion process object part of a pipe in the junction structure. It is XX sectional drawing in FIG. It is the YY sectional view taken on the line in FIG. FIG. 24 is a cross-sectional view corresponding to FIG. 23 in a state where the expansion processing target portion of the pipe is expanded in the joint structure. It is the YY sectional view taken on the line in FIG. It is principal part sectional drawing of the joining structure of 4th Embodiment of this invention. It is principal part sectional drawing of the joining structure of 5th Embodiment of this invention. It is principal part sectional drawing of the joining structure of 6th Embodiment of this invention. It is principal part sectional drawing of the joining structure of 7th Embodiment of this invention. It is a perspective view which shows one modification of a board | plate material.

Explanation of symbols

A1 to A7: joined structure 1 ... pipe 1a ... flat wall portion 1b ... corner portion 2 ... expanded portion 2a ... insertion portion 2b ... near portion of insertion portion 3 ... hollow portion 5 ... plate material 6 ... insertion hole 8 ... seat Part 8a ... Flat wall part 8b ... Corner part 9a ... Concave part 9b ... Convex part 10 ... Joining device 11 ... Die 11a ... Die segment 12 ... Pressing convex part 14 ... Wedge hole part 15 ... Concave part 18 ... Mandrel 19 ... Wedge part 30 ... Restriction member 32 ... Concave portion 33 ... Convex portion 35 ... Bending prevention member

Claims (13)

The pipe is inserted into an insertion hole provided in the plate material, and an expanding die that is divided into a plurality of parts in the circumferential direction is arranged in the hollow portion of the pipe,
Next, each die segment of the die is moved outward in the radial direction of the pipe, so that at least a part of the portion to be expanded consisting of the insertion portion into the insertion hole of the pipe and the portions near both sides in the axial direction is expanded. , A method of joining a plate and a plate, joining a plate to a pipe,
The cross-sectional shape of the pipe is a polygonal shape, and the cross-sectional shape of each corner of the pipe is a substantially arc shape,
The cross-sectional shape of the plate material insertion hole is a shape corresponding to the cross-sectional shape of the pipe,
A short cylindrical seat protrudes in the axial direction of the pipe and is provided integrally with the peripheral edge of the plate material insertion hole,
The die is divided at a position corresponding to each flat wall portion of the pipe,
The seat part of the plate material is arranged on the outer peripheral surface of the pipe in a superposed state, and a regulating member that regulates the amount of bulging to the outside of the seat part is provided between the regulating member and the corner part of the seat part. The die segments of the die are moved outward in the radial direction of the pipe toward the corners of the pipe in a state where the gap of the die is larger than the gap between the regulating member and the flat wall portion of the seat. A method of joining a pipe and a plate material, characterized by performing an expanding process. A portion corresponding to each flat wall portion of the pipe on the outer peripheral surface of the die bonding method between pipe and plate of claim 1, wherein the concave portion extending in the axial direction of the die is provided. The pipe and the plate material according to claim 1 or 2 , wherein the expansion processing is performed in a state in which the bending of the plate material is prevented by sandwiching the plate material from both sides in the thickness direction by the regulating member and the bending prevention member for preventing the bending of the plate material. Joining method. The joining method of the pipe and plate | plate material in any one of Claims 1-3 with which the recessed part or the convex part is provided in the contact surface with the seat part of a control member. The outer circumferential surface of the die, according to claim 1-4 in which two pushing projection to locally bulge outward at least a portion of the axial sides near portion of the insertion portion into the insertion hole of the pipe is provided The joining method of the pipe and board | plate material in any one of. In a state where the pipe is inserted into the insertion hole provided in the plate material, at least a part of the expansion processing target portion including the insertion portion into the insertion hole of the pipe and the portion in the vicinity of the axial direction is expanded, A joint structure of a pipe and a plate material in which a plate material is joined to the pipe,
The cross-sectional shape of the pipe is a polygonal shape, and the cross-sectional shape of each corner of the pipe is a substantially arc shape,
The cross-sectional shape of the plate material insertion hole is a shape corresponding to the cross-sectional shape of the pipe,
A short cylindrical seat protrudes in the axial direction of the pipe and is provided integrally with the peripheral edge of the plate material insertion hole,
In a state where the seat plate is polymerized on the outer circumferential surface of the pipe, the pipe plate is bonded to Rutotomoni,
A joining structure characterized in that the amount of bulging outward of the corner portion of the insertion portion into the insertion hole of the pipe is larger than the amount of bulging outward of the flat wall portion of the insertion portion . The joint structure according to claim 6 , wherein the seat portion of the plate member and the insertion portion of the pipe into the insertion hole are bulged outwardly or are recessed inward. The joint structure according to claim 6 or 7 , wherein at least a part of the portions in the vicinity of both sides in the axial direction of the insertion portion into the insertion hole of the pipe locally bulges outward. The pipe is inserted into the insertion hole provided in the plate material, and a short cylindrical seat portion protruding in the axial direction of the pipe at the peripheral portion of the plate material insertion hole is integrally formed on the outer peripheral surface of the pipe. In a state of being arranged, a joining device that joins a plate material to a pipe by expanding at least a part of an expansion processing target portion composed of an insertion portion into the insertion hole of the pipe and portions near both sides in the axial direction,
An expanding die arranged in a hollow part of the pipe and divided into a plurality in the circumferential direction;
An expanding mandrel that moves each die segment of the die radially outward of the pipe;
A regulating member that is disposed outside the seat portion of the plate material and regulates the amount of bulging to the outside of the seat portion during the expansion process ,
The cross-sectional shape of the pipe is a polygonal shape, and the cross-sectional shape of each corner of the pipe is a substantially arc shape,
The cross-sectional shape of the plate material insertion hole is a shape corresponding to the cross-sectional shape of the pipe,
The die is divided at a position corresponding to each flat wall portion of the pipe,
Each die segment of the die is moved radially outward of the pipe toward each corner of the pipe by a mandrel,
The regulating member is disposed outside the seat portion of the plate material so that the gap between the regulating member and the corner portion of the seat portion is larger than the gap between the regulating member and the flat wall portion of the seat portion. An apparatus for joining a pipe and a plate material. The joining device according to claim 9 , wherein a concave strip extending in the axial direction of the die is provided at a portion corresponding to each flat wall portion of the pipe on the outer peripheral surface of the die. It is equipped with a bending prevention member that prevents bending of the plate material,
The joining device according to claim 9 or 10 , wherein the bending preventing member prevents the bending of the plate material by sandwiching the plate material from both sides in the thickness direction between the regulating member and the bending preventing member during the expanding process. The joining device according to any one of claims 9 to 11 , wherein a concave portion or a convex portion is provided on a contact surface with the seat portion of the regulating member. The outer circumferential surface of the die, at least part of the claimed two pushing projection to locally bulge outward is provided section axial sides near portion of the insertion portion into the insertion hole of the pipe 9 to 12 The joining apparatus in any one of.

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