WO2012120601A1

WO2012120601A1 - Die cast casting apparatus and method for releasing casting from mold

Info

Publication number: WO2012120601A1
Application number: PCT/JP2011/055125
Authority: WO
Inventors: 直晋杉浦; 浩之生田
Original assignee: トヨタ自動車株式会社
Priority date: 2011-03-04
Filing date: 2011-03-04
Publication date: 2012-09-13
Also published as: KR20130122672A; CN103402674A; EP2682205A1; US20130340968A1; JPWO2012120601A1

Abstract

Provided is a die cast casting apparatus (1) comprising: a fixed mold (10) and a movable mold (20) for forming a casting (80), wherein an insert core (21) is disposed in a slidable manner in a movable main mold (12) of the movable mold to form a convex-shaped portion (81) of the casting. The movable mold (20) comprises: casting extrusion mediums (16, 17) for releasing the casting from the movable main mold, insert core transportation mediums (22, 23) for moving the insert core towards the direction in which the casting is released from the mold, and convex-shaped portion release mediums (22, 25, 26) for releasing the convex-shaped portion from the insert core. In a first mold release process, a control medium (28) controls the operations of the casting extrusion mediums, the insert core transportation mediums, and the convex-shaped portion release mediums so that the casting is released from the movable main mold by the casting extrusion mediums (16, 17) and the insert core is moved along the casting by the insert core transportation mediums (22, 23). In a second mold release process, the convex-shaped portion is released from the insert core by the convex-shaped portion release mediums (22, 25, 26).

Description

Die casting apparatus and method for releasing cast product

The present invention relates to a die casting apparatus for producing a cast product having a plurality of convex portions such as cooling fins and a mold product releasing method.

The die casting apparatus has a fixed mold and a movable mold, and a cavity is formed by superposing the movable mold on the fixed mold. The fixed mold or movable mold is provided with an extrusion pin for releasing the cast product after molding. When casting is performed, a predetermined amount of molten metal is supplied while evacuating the cavity, and so-called reduced pressure casting is performed in which the molten metal is injected at a high pressure. Then, after the molten metal in the cavity is solidified and the cast product is formed, mold opening is performed by retracting the movable mold, and the mold product is released from the movable mold by an extrusion pin or the like. FIG. 11 is a cross-sectional view of the die casting apparatus conceptually showing the state at the time of release.

The casting product mentioned here is a cooling fin shown in FIG. The cast product 80 is obtained by integrating a fin portion 81 in which a plurality of thin plates are erected in parallel and a flat plate portion 82 in which the fin portions 81 are orthogonal to each other. FIG. 11 is a view showing a side surface direction (X direction) in which the casting product 80 is manufactured and the fin portions 81 are arranged. In the die casting apparatus 100, after the movable mold 102 is opened from the fixed mold 101, the hydraulic cylinder 103 is extended and the cast product 80 is forcibly released from the movable mold 102 by the push pin 105.

JP-A-8-300132

Since the casting product 80 having a convex portion such as the fin portion 81 has a large contact area with the die, the resistance when releasing after casting is large. Therefore, the conventional die casting apparatus 100 has a problem that the push pin 105 is broken or bent. In this regard, Patent Document 1 discloses a die-casting apparatus in which a nest is incorporated in a movable mold for fin molding and includes fluid supply means for supplying a liquid such as water or machine oil at a high pressure. According to this, after the molten metal solidifies, the insert is retracted to create a space between the product cooling fins, and the liquid is supplied and pressure is applied to the extrusion pin to perform the extrusion load simultaneously. Is made smaller. However, the die casting apparatus of the same document needs to be provided with a fluid supply means and the like, and the structure is complicated, and since a liquid is used, handling is troublesome.

On the other hand, in the case of the die casting apparatus 100, when the periphery of the fin portion 81 is pushed by the push pin 105, the stress is concentrated on the corner 85 at the boundary between the fin portion 81 and the flat plate portion 82, There was a problem that cracking occurred. In this case, not only does the cast product 80 become a defective product and the yield is lowered, but also the problem that the fin portion 81 cannot be released and is separated and remains in the mold. Therefore, in order to prevent cracking of the cast product 80, it is conceivable to release the mold by directly pressing the fin portion 81. However, providing a plurality of pins for pressing the thin fin portion 81 complicates the apparatus and increases the cost. End up. In addition, if the tip portion of the fin pushed by the push pin is crushed and deformed, the ability of the cooling fin constituting the heat exchanger will be reduced as it is. Therefore, in order to maintain the cooling capacity, it is necessary to finish the tip of the fin, which requires labor and a loss of manufacturing time.

Therefore, the present invention has an object to provide a die casting apparatus and a casting product releasing method that make it easy to release a cast product in order to solve such a problem.

A die casting apparatus according to an aspect of the present invention includes a fixed mold and a movable mold that form a cavity for molding a cast product, and forms a convex portion of the cast product in the movable main mold of the movable mold. The movable mold is provided so as to be slidable, and the movable mold includes a product pushing means for releasing the cast product from the movable main mold, and the insert in the mold release direction of the cast product. Nest moving means for moving, and convex release means for releasing the convex portion from the insert, and operating the product pushing means, the nested moving means, and the convex release means. A first releasing step of releasing the cast product from the movable main mold by the product extruding means, and moving the insert according to the cast product by the insert moving means; Parting hand And characterized in that the second release step of releasing the convex portion from the entering-terminal is executed by the.

The convex part releasing means of the die casting apparatus is an extruding means for extruding the cast product in the mold releasing direction in the vicinity of the convex part, and the extruding means extrudes the cast product to thereby provide the second mold release. It is preferable to perform the process.

In the die-casting apparatus, when the insert forms the convex portion in which a plurality of straight upright plates are arranged, the push-out means is inserted into the both sides of the upright plate in the linear direction. Preferably, the control means performs the second mold releasing step by alternately pushing one side of the push-out means sandwiching the insert.

The insert moving means and the pushing means of the die casting apparatus can independently expand and contract the operating rod connected to the insert and the push pin pressed near the convex portion. It is preferable that the unit is configured integrally with a hydraulic unit.

The insert moving means and the convex part releasing means of the die casting apparatus are independent of an operating rod connected to the insert and a plate-like extrusion block pressed near the convex part. It is preferable that the hydraulic unit be integrally formed by a hydraulic unit that can be expanded and contracted.

The product extruding means of the die casting apparatus is such that a plurality of extruding pins or extruding blocks are fixed to an extruding plate, and the extruding plate is moved by a hydraulic cylinder, and the control means includes the hydraulic unit and the hydraulic cylinder It is preferable to be a hydraulic control means for controlling the driving of the motor.

The die-casting apparatus is constituted by a divided block in which the insert is divided into a plurality of pieces, and the convex part releasing means moves the divided blocks of the insert in the release direction of the cast product. And a casting product extruded or supported by the extrusion means in the second mold release step. The casting product is extruded by the extrusion means in the mold release direction in the vicinity of the convex portion. It is preferable that the movement of each of the divided blocks that move relative to the releasable direction by the nest moving means is performed stepwise with respect to the convex portion.

In the die casting apparatus, when the insert forms the convex portion in which a plurality of straight upright plates are arranged, the divided block is divided into a plurality of portions in the linear direction of the upright plate. Preferably there is.

The insert moving means and the pushing means of the die casting apparatus are each independently extended and retracted by operating rods connected to the respective divided blocks of the insert and push pins pressed near the convex portions. It is preferable that the hydraulic unit can be integrally formed.

The insert moving means and the pushing means of the die casting apparatus have an operating rod connected to each divided block of the insert and a plate-like push block pressed near the convex portion, respectively. It is preferable that the unit is integrally formed by a hydraulic unit that can be expanded and contracted independently.

The convex part release means of the die casting apparatus is a grip means for moving the cast product in a gripped state, and the grip means moves the cast product in a predetermined direction to perform the second release step. It is preferable to do it.

In the die-casting apparatus, when the insert forms the convex portion in which a plurality of straight upright plates are arranged, the gripping means pulls the cast product in a linear direction of the upright plates. It is preferable that the second mold releasing step is performed by moving the first step.

According to another aspect of the present invention, there is provided a method for releasing a cast product, wherein a die casting apparatus for forming a cast product having a convex portion is separated from a fixed mold and the mold is opened. The mold for forming the convex portion is moved according to the cast product, so that the portion other than the convex portion of the cast product is movable to constitute the movable mold. It has the 1st mold release process which releases from a main mold | type, and the 2nd mold release process which releases the said convex-shaped part from the said nest | insert.

In the mold release method of the cast product, when the nest is to form the convex portion in which a plurality of linear upright plates are arranged, the second release step is performed in the linear direction of the upright plates. It is preferable that extrusion means arranged with the inserts interposed between the both side positions are used, and the cast product is extruded in the mold release direction by alternately operating one side in the linear direction.

The second releasing step of the casting product releasing method uses the nest constituted by a plurality of divided blocks and moves the divided blocks stepwise to form the convex portion. It is preferable that the mold is released for each divided block.

The second releasing step of the casting product releasing method uses a gripping means for moving the casting product while gripping the casting product, and the gripping means moves the casting product in a predetermined direction. Preferably there is.

In the mold release method of the cast product, in the case where the nest is to form the convex portion in which a plurality of linear upright plates are arranged, the second release step includes the gripping means having the convex shape. It is preferable that the cast product is drawn in the linear direction of the portion.

According to the present invention, since the nest moves in accordance with the cast product in the first mold release process, the convex part having a high mold release resistance is not released, and only the convex part is released in the second mold release process. The resistance in each step is reduced, and the cast product can be easily released from the whole. And the resistance to the said product extrusion means and convex part mold release means which mold-release a cast product at each process becomes small, and those breakage can be prevented. In addition, since the resistance at the time of releasing the convex portion in the second mold releasing step is reduced, the stress applied to the boundary portion between the convex portion and the peripheral portion of the cast product can be reduced, and the casting Product damage can be prevented.

It is sectional drawing which showed the die-casting apparatus of 1st Embodiment notionally, and has shown the state which the mold opened after casting. It is sectional drawing which showed the die-casting apparatus of 1st Embodiment notionally, and has shown the 1st mold release process. It is sectional drawing which showed the die-casting apparatus of 1st Embodiment notionally, and has shown the 2nd mold release process. It is sectional drawing which showed the die-casting apparatus of 1st Embodiment notionally, and has shown the other 2nd mold release process. It is sectional drawing which showed the die-casting apparatus of 1st Embodiment notionally, and has shown the other 2nd mold release process. It is sectional drawing which showed the die-casting apparatus of 2nd Embodiment notionally, and has shown the state which the mold opened after casting. It is sectional drawing which showed notionally the die-casting apparatus of 2nd Embodiment, and has shown the 1st mold release process. It is sectional drawing which showed the die-casting apparatus of 2nd Embodiment notionally, and has shown the 2nd mold release process. It is sectional drawing which showed the die-casting apparatus of 2nd Embodiment notionally, and has shown the 2nd mold release process. It is sectional drawing which showed the die-casting apparatus of 3rd Embodiment notionally, and has shown the 2nd mold release process. It is sectional drawing which showed the conventional die-casting apparatus notionally, and has shown the process of releasing a cast product from a movable mold | type. It is the perspective view which showed the cooling fin which is an example of casting product. It is the perspective view which showed the position of the extrusion pin which extrudes a cast product. It is the perspective view which showed the position of the extrusion block which extrudes a cast product.

DESCRIPTION OF SYMBOLS 1 Die-casting apparatus 10 Fixed type | mold 20 Movable type | mold 12 Movable main type | mold 15 Extrusion board 16 Extrusion pin 17 Hydraulic cylinder 21 Insert 22 Hydraulic unit 23

Actuating rod

25, 26 Extrusion pin 28 Hydraulic control apparatus 80 Casting product 81 Fin part

Next, an embodiment of a die casting apparatus and cast product release method according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view conceptually showing the die casting apparatus of the first embodiment, showing a state where the mold is opened after casting. This die casting apparatus 1 is for producing a cast product 80 shown in FIG. 12, that is, a cooling fin, as in the conventional example.

The die casting apparatus 1 includes a fixed mold 10 and a movable mold 20, and the movable mold 20 can be moved by an actuator shown in the figure, and the mold can be opened or clamped with respect to the fixed mold 10. The movable mold 20 is configured by coupling a movable main mold 12 to a base 14. An extrusion plate 15 is disposed between the movable main mold 12 and the base 14, and a plurality of extrusion pins 16 passing through the movable main mold 12 are fixed to the extrusion plate 15. A hydraulic cylinder 17 is fixed to the base 14, and an extrusion rod 171 passes through the base 14 and is coupled to the extrusion plate 15. Therefore, in the movable mold 20, the extrusion pin 16 is protruded by the hydraulic cylinder 17, and the cast product 80 is released.

Nest 21 is slidably incorporated in the movable main mold 12. The insert 21 is a block formed in a shape reverse to that of the fin portion 81 (see FIG. 12) of the cast product 80. The movable mold 20 is provided with a hydraulic unit 22, and the hydraulic unit 22 includes an operating rod 23 connected to the insert 21 and extrusion pins 25 and 26 for releasing the cast product 80. A plurality of rods and pins can be extended and contracted independently. Therefore, the insert 21 can be slid with respect to the movable main mold 12 by the hydraulic unit 22.

Incidentally, the die casting apparatus 1 uses the extrusion pins 25 and 26 in addition to the extrusion pin 16 to release the cast product 80 from the movable main mold 12. As shown in FIG. 13, the extrusion pins 25 and 26 are arranged on both sides of the fin portion 81 in the longitudinal direction of the fin (Y direction shown in FIG. 12). For example, five extrusion pins 25 are provided on one side. Similarly, five extruding pins 26 are provided on the opposite side of the fin portion 81. A plurality of push pins 16 are arranged at predetermined positions farther from the fin portion 81 than the push pins 25 and 26.

When the casting 80 is released from the movable main mold 12, the extrusion pin 16 that is expanded and contracted by the hydraulic cylinder 17, the operation rod 23 that is expanded and contracted by the hydraulic unit 22, and the extrusion pins 25 and 26 are subjected to independent expansion and contraction control. Is called. The die casting apparatus 1 is provided with a hydraulic control device 28 that controls the hydraulic cylinder 17 and the hydraulic unit 22.

Subsequently, a method for releasing the cast product 80 by the die casting apparatus 1 will be described. 2 and 3 are views showing the mold release process by the die casting apparatus 1 in a stepwise manner, and showing the post process of FIG. In the die casting apparatus 1, molten metal is injected into a cavity formed by overlapping the fixed mold 10 and the movable mold 20, and the molten metal is solidified to form a cast product 80. In the subsequent mold release step, first, the movable mold 20 is separated from the fixed mold 10 and the mold is opened as shown in FIG. At that time, although not shown, the cast product 80 is pushed to the movable mold 20 side by an extrusion pin provided on the fixed mold 10. Therefore, as shown in FIG. 1, the cast product 80 is separated from the fixed mold 10 and is fitted to the movable mold 20 side.

In the present embodiment, when the cast product 80 is removed from the movable main mold 12, the release is divided into two steps, a first release step and a second release step. First, in the first mold release step shown in FIG. 2, the extrusion pin 16 pushes the cast product 80 by the extension operation of the hydraulic cylinder 17 to release it from the movable main mold 12. At that time, in the hydraulic unit 22, the operating rod 23 extends by the same stroke as the hydraulic cylinder 17, and the insert 21 moves along with the cast product 80 pushed out by the push pin 16. Therefore, in this first mold release step, the cast product 80 is detached from the movable main mold 12, but the fin portion 81 is still fitted in the insert 21.

Therefore, next, in the second mold release step shown in FIG. 3, the hydraulic unit 22 is operated, and the extrusion pins 25 and 26 are extended and pressed against the cast product 80. At this time, since the stroke of the actuating rod 23 does not change, the insert 21 remains stationary. Therefore, the casting product 80 extruded in the mold release direction by the push pins 25 and 26 has its fin portion 81 removed from the insert 21 and the entire mold release is completed. In this mold release process, a robot arm (not shown) follows the cast product 80, and the cast product 80 released from the mold is gripped by the robot arm so as not to fall after the mold release and transported to the next process. .

Therefore, in the first mold release step shown in FIG. 2, since the insert 21 moves in the mold release direction, the fin portion 81 having a large mold release resistance is not released and the resistance applied to the push pin 16 is reduced. Can do. Further, since the fin portion 81 is only released in the second releasing step, the resistance applied to the push pins 25 and 26 can be reduced. Therefore, since the resistance in each step is reduced, the push pin 16 and the push pins 25 and 26 can be prevented from being bent or bent. Further, since the resistance applied to the push pins 25 and 26 is reduced, the stress applied to the corner 85 at the boundary between the fin portion 81 where the stress is concentrated and the flat plate portion 82 is reduced, thereby preventing damage at the time of mold release. can do.

Incidentally, in the second mold release step shown in FIG. 3, the expansion of the extrusion pins 25 and 26 is synchronized, but each pin may be expanded and contracted independently. 4 and 5 are views showing another second mold release step performed in place of the method shown in FIG. In this second mold release step, first, as shown in FIG. 4, the hydraulic cylinder 17 is contracted, and the push pin 16 is pulled back into the movable main die 12 via the push plate 15 to leave the cast product 80. Then, the hydraulic unit 22 extends and contracts the extrusion pins 25 and 26 separately while keeping the stroke of the operating rod 23 as it is.

Specifically, as shown in FIG. 4, first, only the extrusion pin 25 located on one side of the fin portion 81 is stretched and pressed against the cast product 80, and then the extrusion pin 25 is shrunk as shown in FIG. While being separated from the cast product 80, the extrusion pin 26 is extended and pressed against the cast product 80. Thus, the fin part 81 is released from the insert 21 by the method of alternately shifting the longitudinal ends of the fins. According to such a mold release method, when the extrusion pin 25 or the extrusion pin 26 pushes out the cast product 80, the force of each pin acts in a direction with an angle from the mold release direction, and the insert 21 and the fin portion 81 Since the force in the shear direction increases, it becomes easy to release. Furthermore, since a force is applied in an oblique direction, the gap between the insert 21 and the fin portion 81 becomes larger, and the frictional force between them can be reduced.

Therefore, the resistance applied to the push pins 25 and 26 is reduced, and the push pins 16 and the push pins 25 and 26 can be prevented from being bent or bent. Further, the stress applied to the corner 85 of the cast product 80 where the stress is concentrated is reduced, and breakage at the time of mold release can be prevented. And in the die-casting apparatus 1 of the present embodiment, since the above-mentioned effects can be achieved by a conventionally used hydraulic mechanism without a special structure, it can be achieved without cost, The device itself is easy to handle. Moreover, in the die-casting apparatus 1, since the extrusion pins 16, 25, and 26 do not directly push the fin portion 81, a thin fin can be manufactured, and the fin is not deformed at the time of mold release.

In the case shown in FIG. 5, the push pin 25 is shrunk, but the push pin 26 may be stretched in the stretched state. In addition, the extending operation of the extrusion pins 25 and 26 performed alternately may be repeated, for example, in increments of 0.1 mm, or may be synchronized from the middle as in the method shown in FIG.

(Second Embodiment)
Next, a second embodiment of the die casting apparatus according to the present invention will be described. FIG. 6 is a cross-sectional view conceptually showing the die casting apparatus of the second embodiment, showing a state where the mold is opened after casting. This die casting apparatus 2 is also for producing a cast product 80 shown in FIG. 12, that is, a cooling fin. And since it has the same structure as the die-casting apparatus 1 of 1st Embodiment, the same code | symbol is attached | subjected and demonstrated to the same structure.

The die casting apparatus 2 includes a fixed mold 10 and a movable mold 30, and the movable mold 30 is provided with a base 14 fixed to a movable main mold 12 and an extrusion pin 16 that is expanded and contracted by a hydraulic cylinder 17. In the present embodiment, a nest 31 divided into the movable main mold 12 is provided and can be moved by a hydraulic unit 32. The insert 31 is composed of a first block 301 and a second block 302, which are connected to the operating

rods

33 and 34, respectively, to enable independent movement. Although the first and

second blocks

301 and 302 are divided into two in the longitudinal direction of the fin, the direction of division may be a direction orthogonal to the fin, and the number of divisions is two or more. May be.

The hydraulic unit 32 is also provided with an extrusion pin 35. The extrusion pins 35 correspond to the extrusion pins 25 and 26 shown in FIG. 13, and a plurality of extrusion pins 35 are arranged on both sides of the fin portion 81 in the longitudinal direction. A plurality of push pins 16 are provided at predetermined positions farther from the fin portion 81 than the push pins 35. The hydraulic cylinder 17 and the hydraulic unit 32 are connected to a hydraulic control device 28 that controls expansion and contraction of the push pins 16 and 35 and the operating

rods

33 and 34.

Next, a mold release method using the die casting apparatus 2 will be described. FIG. 7 to FIG. 9 are diagrams showing the mold release process by the die casting apparatus 2 step by step, and show the post process of FIG. In the die casting apparatus 2, molten metal is injected into a cavity formed by the fixed mold 10 and the movable mold 30, and the molten metal is solidified to form a cast product 80. In the subsequent mold release step, as shown in FIG. 6, mold opening is performed by moving the movable mold 30 from the fixed mold 10. At that time, as shown in FIG. 6, the cast product 80 is fitted away from the fixed mold 10 and on the movable mold 30 side.

First, as shown in FIG. 7, the first release process of the cast product 80 is performed for releasing from the movable mold 30. In the first release step, the extrusion pin 16 pushes out the cast product 80 by the extension operation of the hydraulic cylinder 17 to release it from the movable main die 12. At that time, in the hydraulic unit 32, the operating

rods

33 and 34 are extended by the same stroke as that of the hydraulic cylinder 17, and the insert 31 moves along with the movement of the cast product 80 pushed out to the extrusion pin 16. Therefore, the fin portion 81 of the cast product 80 is still fitted in the insert 31. Then, next, the 2nd mold release process which removes the fin part 81 is performed.

In the second mold release step, first, as shown in FIG. 8, the extrusion pin 35 extends and the cast product 80 is pushed and moved. At that time, the stroke of the operating rod 33 is not changed, only the other operating rod 34 is extended, and the second block 302 is moved in accordance with the movement of the cast product 80 by the push pin 35. Thereby, in the fin part 81, the mold release by the 1st block 301 is performed previously among the inserts 31. FIG. Thereafter, as shown in FIG. 9, the extrusion pin 35 is further extended to move the cast product 80, but this time, the stroke of the operating rod 34 is left as it is. Thereby, the fin part 81 of the cast product 80 is detached from the second block 302 of the insert 31, and the entire mold release is completed. The released cast product 80 is gripped by a robot arm (not shown) so as not to fall, and is transferred to the next process.

By the way, in the 2nd mold release process mentioned above, the method to extend the extrusion pin 35 in the state which stopped the 1st and

2nd blocks

301 and 302 was shown. However, conversely to this method, the fins 81 may be released by stopping the extrusion pins 35 in an extended state and contracting the operating

rods

33 and 34 stepwise. Accordingly, the extrusion pin 35 in this method functions as a member that extrudes the cast product 80 in the first mold release process and releases it from the movable main mold 12, and in the second mold release process, the stroke is left as it is. Functions as a support for 80.

In the die casting apparatus 2 of the present embodiment, the insert 31 moves in the mold release direction in the first mold release process, and the fin portion 81 is not released, and only the fin part 81 is released in the second mold release process. Since it was made to do, the mold release resistance in each process can be made small. And the bending and bending can be prevented by making resistance at the time of mold release with respect to the extrusion pins 16 and 35 small. In particular, in the second mold release step, the mold release is performed stepwise by the divided nest 31, so that the mold release resistance for each block is reduced. Therefore, the stress applied to the corner portion 85 at the boundary between the fin portion 81 and the flat plate portion 82 where the stress is concentrated is reduced, and breakage at the time of mold release can be prevented. Further, in the die casting apparatus 2, since the extrusion pin does not directly push the fin portion 81, a thin fin can be manufactured, and the fin is not deformed.

(Third embodiment)
Next, a third embodiment of the die casting apparatus according to the present invention will be described. FIG. 10 is a cross-sectional view conceptually showing the die casting apparatus of the third embodiment, and is a view showing a step of releasing the cast product from the movable mold. This die casting apparatus 3 is also for producing a cast product 80 shown in FIG. 12, that is, a cooling fin. And since this die-casting apparatus 3 also has the same structure as the die-casting apparatus 1 of 1st Embodiment, it attaches | subjects and demonstrates the same code | symbol to the same structure.

The die casting apparatus 3 includes a movable mold 40 and a fixed mold (not shown). The movable mold 40 is provided with a movable main mold 12 fixed to a base 14 and an extrusion pin 16 that is expanded and contracted by a hydraulic cylinder 17. The movable main mold 12 is provided with a slidable insert 21 and is connected to an operating rod 23 of a hydraulic unit 22. By the way, this die casting apparatus 3 is configured to perform stepwise release by the extrusion pin 16 and release by a robot arm that holds the cast product 80. The drawing shows the hand portion of the robot arm 50, which is used to grip the cast product 80 to prevent it from falling and to transport the cast product 80 to the next process.

In the die casting apparatus 3, the cast product 80 is released as follows. First, after the movable mold 40 is separated from the fixed mold and the mold is opened, the first mold release process of the cast product 80 is performed in the movable mold 40. FIG. 10 shows a stage in which the first release process is finished and the process proceeds to the next second release process. In the first mold release step, the extrusion pin 16 extends through the extrusion plate 15 by the extension operation of the hydraulic cylinder 17, and the cast product 80 is pushed out of the movable main die 12 as shown in FIG. At that time, in the hydraulic unit 22, the operating rod 23 extends by the same stroke as that of the hydraulic cylinder 17, and the insert 21 moves in the mold release direction along with the cast product 80 pushed out to the extrusion pin 16.

Therefore, since the fin portion 81 of the cast product 80 is still fitted in the insert 21, the fin portion 81 is released in the next second release step. In the second mold release step, the fin portion 81 is pulled out by the robot arm 50. The robot arm 50 moves the cast product 80 along the longitudinal direction of the fin. Thereby, the fin part 81 of the cast product 80 comes off from the insert 21, and the whole mold release is completed.

Therefore, also in the die casting apparatus 3 of this embodiment, since the insert 21 moves out of the mold in the first mold releasing step, the fin portion 81 is not released, and only the fin portion 81 is released in the second mold releasing step. Since it molds, the mold release resistance in each process can be made small. Therefore, by reducing the resistance at the time of releasing from the extrusion pin 16, it is possible to prevent the bending or bending. In particular, since the casting product 80 is moved in the longitudinal direction of the fin in the second mold releasing step, the stress applied to the corner portion 85 at the boundary between the fin portion 81 where the stress is concentrated and the flat plate portion 82 is reduced. Breakage during molding can be prevented. Furthermore, since the extrusion pin does not directly push the fin portion 81, a thin fin can be manufactured and the fin is not deformed.

As mentioned above, although embodiment of the die-casting apparatus which concerns on this invention, and the mold release method of cast product was described, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it is various. Needless to say, improvements and modifications are possible. For example, in the first and second embodiments, as shown in FIG. 4, the fin portion 81 is released using the extrusion pins 25 and 26 and the extrusion pin 35, but the extrusion pins 25 and 26 and the extrusion pin 35 are used. Instead, the plate-like extrusion block 45 shown in FIG. 14 may be configured to be taken in and out by a hydraulic unit. In addition, casting products manufactured by the die casting apparatus are not limited to cooling fins, and even cooling fins are not limited to straight fins depending on the embodiment, and are for example meandering fins and pin fins. Also good.

Also, in the second mold release step performed by the die casting apparatus 1 of the first embodiment, the strokes of the extrusion pins 25 and 26 may be managed while detecting the resistance by the load cell. Further, although the third embodiment does not include a pin for extruding the cast product 80 in the second mold releasing step, the robot is provided with the extrusion pins 25 and 26 as in the first embodiment and the fin portion 81 is shifted. You may make it pull out with the arm 50. FIG. Moreover, you may make it add the means which gives vibration to a nest | insert or a cast product.

Claims

A fixed mold and a movable mold constituting a cavity for molding a cast product, and a slidable insert for molding a convex portion of the cast product in the movable main mold of the movable mold In the die casting casting apparatus,
The movable mold includes a product extruding means for releasing the cast product from the movable main mold, an insert moving means for moving the insert in a mold releasing direction of the cast product, and a front portion of the convex portion. A convex part releasing means for releasing from the entry piece,
The cast product is released from the movable main mold by the product pushing means by the control means for controlling the operations of the product pushing means, the nested moving means and the convex part releasing means, and the nested moving means. The first mold releasing step for moving the insert according to the cast product and the second mold release step for releasing the convex portion from the insert by the convex part release means are performed. A die casting apparatus characterized by that.
In the die casting apparatus according to claim 1,
The convex part release means is an extrusion means for extruding the cast product in the mold release direction in the vicinity of the convex part, and the extrusion means performs the second mold release step by extruding the cast product. There is a die casting apparatus characterized by being.
In the die casting apparatus according to claim 2,
In the case where the nest is to form the convex portion in which a plurality of linear upright plates are arranged,
The pushing means is arranged with the inserts sandwiched between both sides of the upright plate in the linear direction,
The die casting apparatus according to claim 1, wherein the control means performs the second mold releasing step by alternately pushing one side of the push-out means sandwiching the insert.
In the die-casting apparatus according to claim 2 or 3,
The telescoping means and the pushing means are integrated with each other by a hydraulic unit capable of independently extending and contracting an operating rod connected to the telescoping member and a push pin pressed near the convex portion. A die casting apparatus characterized by being constructed.
In the die casting apparatus according to claim 1,
The nest moving means and the convex part release means extend and contract each independently an operating rod connected to the nest and a plate-like extrusion block pressed near the convex part. A die casting apparatus characterized by being integrally formed by a hydraulic unit capable of performing
In the die-casting apparatus according to claim 4 or 5,
The product extruding means includes a plurality of extruding pins or extruding blocks fixed to the extruding plate, and the extruding plate is moved by a hydraulic cylinder, and the control means is a hydraulic pressure for driving and controlling the hydraulic unit and the hydraulic cylinder. A die casting apparatus characterized by being a control means.
In the die casting apparatus according to claim 1,
The insert is constituted by divided blocks divided into a plurality of parts, and the convex part release means moves the respective divided blocks of the insert in a mold release direction of the cast product, and the convex It is constituted by extrusion means for extruding the cast product in the mold release direction in the vicinity of the shape part,
In the second mold releasing step, each of the divided blocks that move relative to the reverse mold release direction by the nest moving means with respect to the convex portion of the cast product extruded or supported by the extrusion means. A die casting apparatus characterized in that the movement is performed stepwise.
In the die casting apparatus according to claim 7,
When the nest is to form the convex portion in which a plurality of linear upright plates are arranged, the divided block is divided into a plurality of portions in the linear direction of the upright plate. Die casting equipment.
In the die casting apparatus according to claim 7,
The nest moving means and the pushing means are hydraulic pressures capable of independently expanding and contracting an operating rod connected to each divided block of the nest and an extruding pin pressed near the convex portion. A die casting apparatus characterized in that it is integrally formed by a unit.
In the die casting apparatus according to claim 7,
The nest moving means and the extruding means independently extend and contract an operating rod connected to each divided block of the nest and a plate-like extruding block pressed against the convex portion. A die casting apparatus characterized in that the die casting apparatus is integrally constituted by a hydraulic unit capable of performing the above.
In the die-casting apparatus according to claim 9 or 10,
The product extruding means has a plurality of extruding pins or extruding blocks fixed to an extruding plate and moves the extruding plate by a hydraulic cylinder, and the control means is a hydraulic pressure for driving and controlling the hydraulic unit and the hydraulic cylinder. A die casting apparatus characterized by being a control means.
In the die casting apparatus according to claim 1,
The convex part release means is a gripping means for moving the casting product in a gripped state, and the gripping means performs the second release step by moving the casting product in a predetermined direction. Die-casting equipment characterized by
In the die casting apparatus according to claim 12,
When the nest is to form the convex portion in which a plurality of straight upright plates are arranged, the gripping means is moved by pulling the cast product in a linear direction of the upright plate to A die casting apparatus characterized by performing a two mold release process.
For a die casting casting apparatus that molds a cast product having a convex portion, after releasing the movable mold from the fixed mold and opening the mold, the cast product is released from the movable mold.
A first separation for releasing a part other than the convex part of the cast product from the movable main mold constituting the movable mold by moving a nest for forming the convex part according to the cast product. A casting product release method comprising: a mold step; and a second release step of releasing the convex portion from the insert.
The method for releasing a cast product according to claim 14,
In the case where the nest is to form the convex portion in which a plurality of linear upright plates are arranged,
In the second mold releasing step, the pushing means arranged with the inserts interposed between the both sides in the linear direction of the upright plate are used, and each side of the linear direction is operated alternately in the mold releasing direction. A method for releasing a cast product, wherein the cast product is extruded.
The method for releasing a cast product according to claim 14,
In the second mold releasing step, the convex portion is released for each divided block by using the nest formed by the divided blocks divided into a plurality of blocks and moving each of the divided blocks stepwise. A method for releasing a cast product, characterized in that:
The method for releasing a cast product according to claim 14,
The second mold release step uses a gripping means for moving the casting product while gripping the casting product, and the gripping means moves the casting product in a predetermined direction. Mold release method.
The method for releasing a cast product according to claim 17,
In the case where the nest is to form the convex portion in which a plurality of linear upright plates are arranged,
In the second mold releasing step, the mold product releasing method is characterized in that the gripping means pulls the cast product in a linear direction of the convex portion.