JPH09234553A - Device for producing casting and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem of the cutting off of a gate outside a die in the conventional molten metal squeezing method or die casting method and to secure the stability of quality of molten metal. SOLUTION: An upper die 50 is raised more than the gate thickness while applying the pressure to a hydraulic cylinder 60 for holding an intermediate die after pressurizing and solidifying the molten metal. Thereafter, a floating die for pressing a lower end ring is press-raised with a hydraulic cylinder 56 for pressing the lower end ring together with rising of the upper die 50 to cut off the gate in the die. Thereafter, the upper die 50 and the intermediate die 51 are raised and then, a product is taken out of the intermediate die 51. On the other hand, a molten metal pool part 9b is taken out upward finally by raising a punch 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a casting made of, for example, copper, aluminum or an alloy thereof.

[0002]

2. Description of the Related Art FIG. 7 shows, for example, Japanese Patent Laid-Open No. 62-12357.
FIG. 3 is a cross-sectional view showing a conventional cage-shaped rotor pouring device shown in Japanese Patent Laid-Open Publication No. 5 (5)-(5), in which (5) is an extruding rod, and (14) is a knockout punch. . (1
5) is a punch, (16) is a moving table such as a press,
(17) is a pillar, and (11) is an upper mold, and is connected to the table (16) by the pillar (17). (9) is a lower mold, which is a basin (9) containing molten aluminum (6).
a) is provided and comprises an extruding rod (5). Upper mold (1
The gate (9b) for introducing the molten aluminum (6) into the cavity (9c) into which the rotor core (1a) can be inserted is constituted by the lower mold (1) and the lower mold (9). (20) is an extrusion table of the press, and (21) is a knockout lower plate, which is fixed to the knockout punch (14). (41)
Is a gas discharge port provided at the upper end of the cavity (9c) at a position facing the gate (9b). Note that in FIG. 8, the punch (15) in FIG.
It is an expanded sectional view which shows the filling and pressurization state pushed in to a).

In FIG. 9 (a), the upper mold (11) and the lower mold (9) are preheated to about 250 ° C., and a cage shape having a large number of slots in the cavity (9c) of the lower mold (9). The rotor core is inserted, the moving table (16) is lowered, and the upper mold (11) joined by the support (17) is pressed against the lower mold (9) to perform mold clamping. After that, molten aluminum (6) is poured from the injection port (11a) of the upper mold (11) into the puddle (9a) of the lower mold (9) so that the liquid level is below the gate (9b), and promptly. The upper punch (15) is lowered to extrude the molten aluminum (6) accumulated in the pool (9a), and the molten aluminum is slowly flown into the slot and the end ring portion of the rotor core (1a) in the cavity (9c). Pour (6). The flow rate of the molten aluminum (6) is controlled while controlling the speed of the upper punch (15). Molten aluminum (6) is
b) The slots are sequentially filled upward from the vicinity of the gate, and the gas discharge port (4
Reach 1). After filling the molten aluminum (6), it is solidified by applying a high pressure of 400 kg / cm ² or more in a molten or semi-solidified state. After the solidification is completed, the upper mold (11) and the lower mold (9) are opened, and the rotor core on which the rotor conductor is formed is extruded by the extrusion rod (5).

[0004]

As is well known, the molten metal forging method has heretofore been a very effective method for producing a high-quality rotor with a small number of cavities, as compared with the die casting method and the like. However, the gate may be cut by another press after taking out the entire casting. In the case of the small rotor as in the above-mentioned conventional example, this is not a problem, but there is a problem that the influence of the cutting process on the mass production cannot be ignored when the size of the rotor becomes large. Further, there are problems such as cutting of the gate outside the mold after casting, post-processing of the outer periphery of the iron core, shrinkage cavities in the conductor, or cracking in the case of copper. Further, in terms of safety, there is a risk that the molten metal will be blown out from the mold dividing surface, and there will be a risk when an operator handles the molten metal.

The present invention has been made in order to solve the above-mentioned problems, and it has been a problem in the conventional melt forging method and die casting method that the cutting of gates outside the mold, post-processing, shrinkage cavities, and copper It is an object of the present invention to provide a casting manufacturing apparatus and method suitable for mass production, in which case there is no cracking and there is little risk of molten metal blowing out.

[0006]

A casting manufacturing apparatus according to a first aspect of the present invention is an apparatus for manufacturing a casting by injecting a molten metal into a cavity to solidify the casting, and an intermediate die for forming a cavity, and an intermediate die for forming the cavity. An upper die and a lower die that are arranged so as to sandwich the die from both sides and share a dividing surface with the intermediate die, and are provided in holes formed in each of the upper die and the lower die. An upper floating type and a lower floating type which are slidable in a direction in which the cavity volume is changed in the upper mold and the lower mold, and these upper floating type and lower floating type are moved by pressure in the upper mold and the lower mold, respectively. The upper floating type pressure moving means and the lower floating type pressure moving means, and the runner and the gate formed in the lower die for guiding the molten metal to the cavity.

A casting manufacturing apparatus of the second invention is an apparatus for manufacturing a casting by injecting a molten metal into a cavity to solidify the casting, and an intermediate die for forming a cavity and the intermediate die sandwiched from both sides. The upper mold and the lower mold, which are arranged in a shape and share a dividing surface with the intermediate mold, and the upper mold and the lower mold which are arranged in the holes formed in the upper mold and the lower mold, respectively. The upper floating type and the lower floating type which are slidable in the direction in which the cavity volume is changed, and the upper floating type pressurizing for moving the upper floating type and the lower floating type in the upper mold and the lower mold, respectively. Moving means and lower floating type pressure moving means, runner and gate formed in the lower die to guide the molten metal to the cavity, and intermediate die position control means for relative position control of the intermediate die with respect to the upper die To have A.

A casting production apparatus according to a third aspect of the present invention is the casting production apparatus according to the first or second aspect of the present invention, further comprising upward movement preventing means for preventing relative movement of the upper floating die in the upper die. I had it.

A casting production apparatus according to a fourth aspect of the present invention is the casting production apparatus according to the first or second aspect, wherein the lower floating type has an elastic pressurizing means for pressurizing the work in the cavity by elastic force. It is the one.

A fifth aspect of the present invention is the method of producing a casting according to any one of the first to fourth aspects of the present invention, wherein the molten metal is injected into the cavity and solidified to produce a casting. After injecting a molten metal into the cavity using the device to solidify, the upper mold alone is lifted while the intermediate mold is still attached to the lower mold, and the lower floating mold is lifted to move the work piece in the intermediate mold. It was moved and the gate was cut.

A casting production apparatus according to a sixth aspect of the present invention is the casting production apparatus according to any one of the first to fourth aspects, wherein either one of the upper die and the intermediate die dividing surface or the intermediate die and the lower die dividing surface is divided. A cover is attached to the outer circumference of the surface.

A casting manufacturing apparatus according to a seventh aspect of the present invention is the casting manufacturing apparatus according to the first to fourth aspects, wherein an outer peripheral portion including a pond and a cavity is provided on a dividing surface between the lower die and the intermediate die. It is designed to have a step.

An eighth aspect of the casting production apparatus of the present invention is the casting production apparatus of the first to fourth aspects of the present invention, which is provided with scattering prevention means for preventing the molten metal from splashing into the mold during pouring. Is.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are sectional configuration diagrams showing a casting manufacturing apparatus according to Embodiment 1 of the present invention. In FIG. 1, (9
b) is a runner, (9d) is a gate, (50) is an upper mold,
(51) is an intermediate mold, (52) is a lower mold, (53) is a sleeve, (54) is an upper end ring pressurizing hydraulic cylinder,
(55) is a floating type for pressing the upper end ring, (56) is a hydraulic cylinder for pressing the lower end ring (57) is a floating type for pressing the lower end ring, and (58) is a temporary shaft for fixing the iron core. Further, FIG. 2C is a sectional configuration diagram showing a state in which the upper mold is being opened when the gate is cut in the casting manufacturing apparatus of the first embodiment. In the figure, (60) is a cylinder for pressing the intermediate die (51) against the lower die (52), and an intermediate die pressing cylinder (61) is a cylinder for moving the intermediate die (51) up and down. Further, FIG. 2D is a sectional configuration diagram showing a state in which the upper die and the intermediate die are lifted and the gate is cut in the casting manufacturing apparatus of the first embodiment. In the figure, (9a) is a solidified pool of water after cutting.

Next, the operation will be described. First, the upper mold (5
0) and the intermediate mold (51) are raised, and the molten metal (6) is poured into the puddle 9a. After that, the upper mold (50) and the intermediate mold (51) are lowered to close the mold, the punch (15) is lifted, and the molten metal (6) is passed through the runner (9b) and the gate (9d) to be lowered. The end ring (1d), the rotary iron core (1a), and the upper end ring (1c) are filled to make them. Immediately after filling or after a certain period of time, the upper end ring (1c) upper surface is fixed to the upper end ring pressurizing floating type (5
5) Pressurize and solidify via. Lower end ring (1d)
Similarly, pressure solidification is performed.

Next, a method of cutting the gate of a product obtained by completely pressing and solidifying under pressure in this way and having an iron core having an upper end ring (1c) and a lower end ring (1d) will be described. First, the intermediate die holding cylinder (6
While applying pressure to 0), the upper die (50) is raised by more than the gate thickness. Thereafter or simultaneously with the rising of the upper die (50), the lower end ring pressurizing floating die (57) is raised by the lower end ring pressurizing cylinder (56). Then, the gate (9b) is disconnected. Then, the upper mold (5
0) and the intermediate type (51) are raised. Then, the product is taken out from the intermediate mold (51). On the other hand, for the water pool (9a), the punch (15) is finally lifted and taken out to the upper part.

As described above, the gate can be cut in the mold, and the post-processing of the iron core is not required, and the mass productivity can be improved.
It should be noted that the cylinder may be hydraulic or pneumatic as long as the force is sufficient.

Embodiment 2. The second embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a sectional configuration diagram showing a casting manufacturing apparatus according to the second embodiment. In the figure, (7
Reference numeral 0) is a positioning type for the inner diameter portion of the iron core end surface on the upper end ring side, which is fixed to the floating type for pressing the upper end ring.
Reference numeral (71) is a spring for preloading the iron core end surface inner diameter portion positioning die on the lower end ring side, and (72) is a spring for preloading the iron core end surface inner diameter portion positioning die on the lower end ring side (71).
(57) is a lower end ring pressurizing floating type, and (50) is an upper type.

Next, the operation will be described. The operation of making a product is similar to that of the first embodiment. As a characteristic of the die structure, the flow resistance generated in the process of filling the molten metal (6) causes the iron core 1 to rise, and as a result, the iron core end face inner diameter portion positioning die (70) on the upper end ring side also tries to rise. However, with the upper end ring side iron core end surface inner diameter portion positioning die (70) in contact with the upper die,
It is supported by the mold closing force of the press of the main body. for that reason,
The initial state is maintained without rising. On the other hand, the iron core end face inner diameter portion positioning die (71) on the lower end ring side tends to descend because the inner diameter portion of the end ring has a tapered shape. However, in this device, the floating type (57) for pressurizing the lower end ring is provided by the spring (72) having the strength to overcome the downward force generated by the tapered surface in order to simplify the mold structure.
It is pressed against and fixed.

As described above, the gate can be cut in the mold, the iron core does not need to be post-processed, and the mold parts and the iron core (1) do not move until the molten metal is completely filled. It was possible to improve the mass productivity. It should be noted that the spring does not have to stick to the spring as long as a force sufficient to overcome the force applied to the tapered portion of the end ring is obtained, and an air cylinder or the like may be used.

Embodiment 3 Embodiment 3 of the present invention will be described below with reference to the drawings. FIG. 4 is a perspective view showing an apparatus for manufacturing a casting according to the third embodiment. In the figure, (81) is a cover attached to the side surface of the intermediate mold (51).

Next, the operation will be described. The operation of making a product is the same as in the first embodiment. A feature of the mold structure is that a cover (80) is provided on the upper surface of the lower mold, and a gap is generated between the lower mold (52) and the intermediate mold (51) for some reason during the molten metal filling process. When the molten metal blows out, the molten metal hits the cover and falls downward. As a result, it is possible to prevent the mold from laterally blowing out. When the cover is difficult to attach in the pouring direction of the molten metal, a groove (81) is provided on the parting surface to prevent the molten metal from blowing out. Further, as shown in the enlarged view, the portion overlapping the lower mold (52) is tapered to prevent contact during mold clamping.

As described above, the maintainability against accidental molten metal ejection is improved, the safety is improved, and the mass productivity can be improved. The cover need not be attached only to the intermediate mold, and may be attached to the upper mold.

Embodiment 4 Embodiment 4 of the present invention will be described below with reference to the drawings. FIG. 5 is a perspective view showing a casting manufacturing apparatus according to the fourth embodiment. In the figure, (52a)
Is a step provided on the outer periphery of the upper surface of the lower mold (52).

Next, the operation will be described. The operation of making a product is similar to that of the first embodiment. A feature of the mold structure is that a step (52a) is provided on the upper surface of the lower mold, and the lower mold (52) may be damaged for some reason during the molten metal filling process.
If a gap occurs between the mold and the intermediate die (51) and the molten metal is blown out, the molten metal is likely to solidify while being bent at the step, so the amount blown out from the die is suppressed. be able to.

As described above, the maintainability against accidental molten metal ejection is improved, the safety is also improved, and the mass productivity can be improved.

Embodiment 5 FIG. Embodiment 5 of the present invention will be described below with reference to the drawings. FIG. 6 is a perspective view showing a casting manufacturing apparatus according to the fifth embodiment. In the figure, (52b)
Is a cover used when pouring in the molten metal.

Next, the operation will be described. The operation of making a product is similar to that of the first embodiment. A feature of the mold structure is that the molten metal is prevented from spilling by covering the parting surface with the cover (52b) during pouring.

As described above, the maintainability against accidental molten metal ejection is improved, the safety is also improved, and the mass productivity can be improved.

[0030]

Since the present invention is configured as described above, it has the following effects.

The casting manufacturing apparatus of the first and second inventions is an apparatus for manufacturing a casting by injecting a molten metal into a cavity and solidifying the molten metal into an intermediate die for forming a cavity and both sides of the intermediate die. An upper die and a lower die which are arranged so as to be sandwiched between the upper die and the lower die which share a dividing surface with the intermediate die, and the upper die and the lower die which are arranged in holes formed in the upper die and the lower die, respectively. An upper floating type and a lower floating type that are slidable in the lower mold in a direction that changes the cavity volume, and an upper floating type that moves the upper floating type and the lower floating type under pressure in the upper mold and the lower mold, respectively. Mold pressure moving means and lower floating type pressure moving means, runners and gates formed in the lower mold for guiding the molten metal to the cavity, and an intermediate mold for controlling the relative position of the intermediate mold with respect to the upper mold. To have position control means Therefore, it is possible to cut the gate in the mold, and since the gate is not in contact with the end face of the iron core, there is no need for post-working of the iron core, and pressure solidification of the end ring is also possible, so there are no cavities or cracks of high quality. Can manufacture motor rotors,
Mass productivity is improved.

The casting manufacturing apparatus of the third and fourth inventions is the casting manufacturing apparatus of the first or second invention,
Since the upper floating mold has an upper movement preventing means for preventing relative movement upward in the upper mold and the lower floating mold has an elastic pressurizing means for pressurizing the work in the cavity by an elastic force, the molten metal is filled. Sometimes the iron core does not move and the end ring can be pressed and solidified sufficiently, so that a high-quality motor rotor without cavities and cracks can be manufactured, and mass productivity is improved.

The method for producing a casting according to the fifth aspect of the present invention is the method for producing a casting by injecting a molten metal into a cavity and solidifying the molten metal to produce the casting. After injecting a molten metal into the cavity using the device to solidify, the upper mold alone is lifted while the intermediate mold is still attached to the lower mold, and the lower floating mold is lifted to move the work piece in the intermediate mold. Since it is moved and the gate is cut, it is not necessary to cut the gate after molding.
Improve production efficiency.

A casting production apparatus according to a sixth aspect of the present invention is the casting production apparatus according to any one of the first to fourth aspects of the present invention, wherein either one of the upper die and the intermediate die dividing surface or the intermediate die and the lower die dividing surface is divided. Since the cover is attached to the outer periphery of the surface, it is possible to prevent the molten metal from being blown out from the mold dividing surface, which enhances the safety and prevents the mass productivity from being adversely affected.

A casting manufacturing apparatus according to a seventh aspect of the present invention is the casting manufacturing apparatus according to the first to fourth aspects, wherein an outer peripheral portion including a pool and a cavity is provided on a dividing surface of the lower die and the intermediate die. Since the step is formed, it is possible to prevent the molten metal from being blown out from the mold dividing surface, which enhances the safety and prevents the mass productivity from being adversely affected.

The casting production apparatus of the eighth invention is the casting production apparatus of the first to fourth inventions, which is provided with scattering prevention means for preventing the molten metal from splashing into the mold during pouring. , It is possible to prevent the molten metal from spilling on the divided surface during pouring, and unnecessary work such as mold cleaning and maintenance is unnecessary.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram showing an apparatus for manufacturing a molded product according to a first embodiment of the present invention.

FIG. 2 is a sectional configuration diagram showing an apparatus for manufacturing a molded product according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional configuration diagram showing a molded product manufacturing apparatus according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing an apparatus for manufacturing a molded product according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram showing an apparatus for manufacturing a molded product according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a device for manufacturing a molded product according to a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional configuration diagram showing a conventional casting manufacturing apparatus.

FIG. 8 is a cross-sectional configuration diagram showing a conventional casting manufacturing apparatus.

FIG. 9 is a cross-sectional configuration diagram showing a conventional casting manufacturing apparatus.

[Explanation of symbols]

1a ... Rotor core, 1c ... Upper end ring, 1
d ... Lower end ring, 5 ... Extrusion rod, 6 ... Metal melt, 9 ... Upper mold, 9a ... Hot water pool, 9b.
.... Runners, 9c ... cavities, 9d ... gates, 11 ... upper molds, 14 ... knockout punches,
15 ... punch, 16 ... moving table, 17 ...
-Posts, 20 ... Hole punching table, 21 ... Knockout lower plate, 41 ... Gas exhaust port, 50 ... Upper mold, 51
... Middle type, 52 ... Lower type, 53 ... Sleeve,
54 ... Upper end ring pressurizing cylinder, 55 ...
・ Floating type for pressing upper end ring 56 ・ ・ ・ Cylinder for pressing lower end ring 57 ・ ・ ・ Floating type for pressing lower end ring, 58 ・ ・ ・ Temporary shaft for fixing iron core, 60 ・ ・ ・ Cylinder for pressing intermediate mold, 61 ... Intermediate type moving cylinder, 71 ... Iron core end surface inner diameter positioning type, 72 ...
Spring, 80 ... Cover, 81 ... Groove, 52a ...
Step, 52b ... Cover

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication H02K 17/16 H02K 17/16 A (72) Inventor Shigeki Maekawa 2-2 Marunouchi, Chiyoda-ku, Tokyo No. 3 Sanritsu Electric Co., Ltd. (72) Inventor Yasushi Tokage 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanritsu Electric Co., Ltd.

Claims (8)

[Claims] 1. An apparatus for producing a casting by injecting a molten metal into a cavity to solidify the same, and an intermediate die for forming a cavity, and the intermediate die arranged so as to sandwich the intermediate die from both sides. An upper mold and a lower mold that share a dividing surface with the mold, and a direction in which the cavity volume is changed in the upper mold and the lower mold, which are disposed in the holes formed in the upper mold and the lower mold, respectively. An upper floating type and a lower floating type, and an upper floating type pressure moving means and a lower floating type pressure movement for moving the upper floating type and the lower floating type under pressure in the upper mold and the lower mold, respectively. An apparatus for manufacturing a casting, comprising means and a runner and a gate formed in the lower mold and guiding the molten metal into the cavity. 2. An apparatus for manufacturing a casting by injecting a molten metal into a cavity to solidify the same, and an intermediate die for forming a cavity, and the intermediate die disposed so as to sandwich the intermediate die from both sides. An upper mold and a lower mold that share a dividing surface with the mold, and a direction in which the cavity volume is changed in the upper mold and the lower mold, which are disposed in the holes formed in the upper mold and the lower mold, respectively. An upper floating type and a lower floating type, and an upper floating type pressure moving means and a lower floating type pressure movement for moving the upper floating type and the lower floating type under pressure in the upper mold and the lower mold, respectively. Means, a runner and a gate formed in the lower mold for guiding the molten metal into the cavity, and an intermediate mold position control means for controlling the relative position of the intermediate mold with respect to the upper mold. Casting manufacturing equipment. 3. The casting production apparatus according to claim 1 or 2, further comprising an upward movement preventing means for preventing the upper floating die from relatively moving upward in the upper die. . 4. The casting manufacturing apparatus according to claim 1, wherein the lower floating type has an elastic pressing means for pressing the work in the cavity by elastic force. 5. A casting manufacturing method for manufacturing a casting by injecting a molten metal into a cavity and solidifying the molten metal, using the casting manufacturing apparatus according to claim 1.
After injecting the molten metal into the cavity and solidifying it, only the upper mold is lifted while the intermediate mold is still attached to the lower mold, and the lower floating mold is lifted to move the work inside the intermediate mold, and the gate A method for manufacturing a casting, which is characterized in that it is cut. 6. The casting manufacturing apparatus according to any one of claims 1 to 4, wherein a cover is provided on an outer periphery of a split surface between the upper die and the intermediate die or between the intermediate die and the lower die. An apparatus for producing castings, characterized by being attached with. 7. The casting manufacturing apparatus according to any one of claims 1 to 4, wherein a step is provided on an outer peripheral portion including a pond and a cavity on a dividing surface of the lower die and the intermediate die. An apparatus for producing castings, characterized by: 8. The casting manufacturing apparatus according to any one of claims 1 to 4, further comprising a scattering prevention means for preventing the molten metal from scattering in the mold during pouring. .