JPH0952146A - Casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability and the production cycle and to reduce the cost of a insert core molding by arranging each rod to a course not interfering shiftings of the upper molds and the insert cores in the vertical and horizontal directions. SOLUTION: When the insert cores 8D, 9D and the upper molds 10, 11 arranged proximately and in parallel at the inside of metallic molds 3, 4, are raised by an elevating/lowering device, the upper molds 10, 11 and the insert cores 8, 9 are stopped at the rising position so as not to mutually superpose in the side surface view by stoppers 20, 21 arranged in different heights. When devices 28D, 29D of insert core sliding devices 22, 23 are driven, the divided pieces 8D, 9D of the insert cores 8, 9 are horizontally shifted to the outside in the direction parallel to the metallic molds 3, 4 through rods 26, 27 arranged in the course not interfering the shiftings of the upper molds 10, 11 and the rods 26, 27 in the vertical and the horizontal directions. By this method, the durability of the insert core can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting apparatus in which a plurality of upper molds and a moving mold are integrally moved in the vertical direction with respect to one lower mold, and in particular, a plurality of upper molds and a moving mold are arranged in close proximity to each other. The present invention relates to a casting device arranged.

[0002]

2. Description of the Related Art When casting a plurality of casting products, an upper die is set with respect to one fixed lower die, and a shift die is assembled from four sides of the die to form a cavity in the die. After the molten metal is poured and cooled, the upper mold and the shift mold are removed and the cast product cast is taken out. In this case, among the adjacent dies, the adjacent dies facing each other (hereinafter, referred to as “inner lining type”) are arranged on the same plane, so that the pulling out margin for the product is limited by the problem of space or the like. Instead, only the inner gathering mold is composed of sand molds and placed on the lower mold, and the other gathering molds are used as molds. That is, one surface of a cast product is composed of molds, and
The surface is made of sand.

[0003]

However, if the inner side aligning die is composed of a sand type, the durability is lower than that of the mold, so that only the inner side aligning die must be replaced for each casting, and workability is good. There is a problem that it does not exist. In addition, there is a problem in that it is necessary to form the inward moving mold frequently, resulting in an increase in cost, and it takes time to form the mold, which affects the production cycle of the cast product. An object of the present invention is to provide a casting apparatus which has good workability and can improve the production cycle of cast products at low cost.

[0004]

Therefore, in the present invention, an upper die movable vertically with respect to a lower die, a plurality of shifting dies movable vertically and horizontally, and the upper die and the moving dies. With respect to the lower mold, a lifting device for stopping the upper mold and the closing mold at a predetermined rising position, and a horizontal position from a casting product cast in the mold for the closing mold at the rising position. And a top slide device for vertically separating the upper mold from the casting product at the raised position, and two sets of the molds are arranged in parallel with each other. The stoppers are arranged at different heights so that the two shift molds located inside the two sets of molds do not overlap each other in the elevated position in a side view. Side-by-side slide equipment Is composed of a rod connected to each of the two pulling dies and a mold driving device for horizontally moving the two pulling molds via the rods. And the rods are arranged in a path that does not interfere with the vertical and horizontal movements of the upper mold and the closing mold, and the cross slide device is located near the rising position where the upper mold stops. Placed in.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. A casting apparatus indicated by reference numeral 1 in FIG. 1 drives a frame 2 that constitutes a base frame, two casting dies 3 and 4 provided in a lower portion of the frame 2, and the dies 3 and 4. Is provided with two sets of mold driving mechanisms 5 and 6 and the like.

The molds 3 and 4 are arranged in parallel close to each other, and a lower mold 7 fixed to the bottom base member 1A of the frame 2 and upper molds 10 and 11 provided on the lower mold 7. A plurality of shifting molds 8 and 9 supported so as to be movable in the horizontal direction
And upper molds 10 and 11 provided on the closing molds 8 and 9, and a part of the upper molds 10 and 11 is a nesting mold 1.
It is composed of 2 and 13. The internal space surrounded by these molds 7 to 13 is cavities 14 and 15 corresponding to the shape of the casting product W to be cast. The lower mold 7 is provided with gates 16 and 17 for injecting the molten metal into the cavities 14 and 15, respectively. Cast product W
Here, an engine component (cylinder head) made of aluminum alloy is taken as an example here, but other products may be used. The casting product W of the illustrated example has a bottomed box shape with an open top surface.

The mold driving mechanisms 5 and 6 are composed of a shift mold 8 and an upper mold 1.
0, the raising and lowering devices 18 and 19 for raising and lowering the shifting dies 9 and the upper dies 11 together with respect to the lower dies 7, and the stoppers 20 for stopping the upper dies 10 and 11 and the shifting dies 8 and 9 at predetermined rising positions, 21 is mounted to the upper molds 10 and 11 at the rising position, and the offset mold slide devices 22 and 23 for horizontally separating the shifting molds 8 and 9 from the casting product W in the molds 3 and 4. It is composed of upper slide devices 24 and 25 for vertically separating the inserts 12 and 13 from the casting product W.

As shown in FIG. 3, the grouping dies 8 and 9 are divided into a plurality of (for example, four) divided pieces (8A, 8B, 8C, 8D and 9A, 9B, 9C, 9D) that can be divided in the front-rear direction and the left-right direction. )
It is composed of Dividing pieces 8A, 8B, 8 of the grouping die 8
As shown in FIGS. 1 and 2, C is a cross-type slide device 2
By the depressing cylinders 28A, 28B and 28C forming part 2, the dividing pieces 9A, 9B and 9C of the shifting die 9 are depressing cylinders 29A, 29B and 2 forming the depressing slide device 23.
9C drives in the mold releasing direction and the mold clamping direction, respectively.

Shafts 30 and 3 of the close type cylinders 28A, 28B and 28C and the close type cylinders 29A, 29B and 29C.
Joint hooks 32 and 33 are attached to the unit 1. The joint hooks 32 and 33 are moved in the horizontal direction by the respective offset cylinders, and the upper die 1
The joint hooks 32 and 33 move the hooks 8 and 9 when the hooks 0 and 11 rise to a position where they come into contact with the stoppers 20 and 21.
The engaging portions 34 and 35 are fitted.

Two inner molds (hereinafter referred to as "inner molds") 8D and 9D of the molds 8 and 9 can be horizontally moved by the cylinders 28D and 29D as the mold drive devices. There is. Side cylinders 28D, 29
D has rods 26 and 27 through shafts 30 and 31.
It is possible to move horizontally by connecting with the inner side aligning molds 8D and 9B which are connected via. Side cylinders 28D, 29
D is arranged outside the two dies 3 and 4 in the parallel direction. That is, the close die slide devices 22 and 23 are
It is arranged in the vicinity of the stoppers 21 and 21 which are the ascending positions where the 0 and 11 and the shift dies 8 and 9 are stopped.

The rod 26 and the rod 27 are arranged in parallel with the molds 3 and 4, as shown in FIG. The rod 27 is arranged above the stopper 20, the rod 26 is arranged below the stopper 21, and
It is arranged below the rod 27. Rod 27
Is formed into a rectangular window frame shape in plan view, and the inner space portion 27a is provided larger than the outer shape of the mold 3 to prevent interference when the mold 3 moves. Rod 2
7 is disposed above the close-type cylinders 28A, 28B, 28C, and the close-type cylinders 28A, 28B, 28
The interference with the shift die 8 when driving C is prevented.
The tip 27b of the rod 27 has an engaging portion 35 of the pulling die 9D.
A joint hook 33 that engages with is provided.

Like the rod 27, the rod 26 is formed in a rectangular window frame shape in plan view, and as shown in FIG. 1, the inner space portion 26a is provided larger than the outer shape of the mold 4. Interference when moving the mold 4 is prevented. The rod 26 is disposed above the close-type cylinders 29A, 29B, and 29C, and the close-type cylinders 29A, 29B.
This prevents interference with the shift die 9 when driving B and 29C. A joint hook 32 that engages with the engaging portion 34 of the pulling die 8D is provided at the tip 26b of the rod 26. That is, the rods 26 and 27 are arranged in a path that does not interfere with the vertical and horizontal movements of the upper molds 10 and 11 and the shift molds 8 and 9.

The central portions of the upper molds 10 and 11 can be raised only up to the raised position shown in FIG. 4 by horizontal plate-shaped stoppers 20 and 21. The stoppers 20 and 21 are fixed to the frame 2 at different heights so that the inner shift dies 8D and 9B are positioned at positions where they do not overlap each other in a side view in a raised position. Specifically, the stopper 21 is at least the closing die 8
Is arranged above the stopper 20 with a space of a height h or more.

Openings 10a, 11a into which the insert dies 12, 13 are inserted from above are formed in the central portions of the upper dies 10, 11.
Is provided. The inner peripheral edge portions 10b and 11b of the opening portions 10a and 11a are continuous in a frame shape, and have a shape capable of uniformly contacting the end portion of the opening edge portion W1 of the cast product W over substantially the entire circumference. There is.

The insert molds 12 and 13 have a convex portion 37 which is inserted from above into the inside of the shift molds 8 and 9. The peripheral wall of the convex portion 37 is formed as an inclined taper surface so that the cast product W after casting can be released downward. Elevating drive rods 36, 38 are connected to the insert molds 12, 13. The elevating drive rods 36 and 38 extend above the insert molds 12 and 13, respectively, and the pair of left and right elevating cylinders 1 constituting the elevating means 18 and 19 shown in FIG.
8A, 18B and 19A, 19B (shown in FIG. 2) are driven in the vertical direction. The elevating ceilings 18A, 18B and 19A, 19B are provided on the frame 2, respectively.

Lifting ceilings 18A, 18B and 19A, 1
9B rods 39a, 39b and 40a, 40b respectively
Are horizontal connecting beams 41, 42 that project upward respectively.
Are connected to each other by. Brackets 43 and 44 are provided at the centers of the connecting beams 41 and 42, and the upper ends of the lifting drive rods 36 and 38 are connected to the brackets 43 and 44. Therefore, the lifting ceiling 19A,
19B and 20A and 20B rods 39a, 39b and 40
When a and 40b move up and down, these rods 39a and 3a
9b, 40a, and 40b move up and down drive rod 3
6, 38 will move up and down.

As shown in FIG. 1, a plurality of push-out pins 50 and 51 constituting upper slide devices 24 and 25 are inserted into the insert molds 12 and 13 from above. The push-out pins 50 and 51 are movably inserted into through holes provided in the insert molds 12 and 13 in the vertical direction. The upper ends of the push pins 50 and 51 are fixed to the back plates 52 and 53. The lower end surfaces of the extruding pins 50 and 51 are opposed to the end surfaces of the cast product W, such as the solid portion and the thick portion, which have relatively high strength. Back plates 52, 53
Is kept parallel to the upper molds 10 and 11 by the mold split pins 54 and 55. This back plate 52, 53
Is vertically movable relative to the lifting drive rods 36 and 38.

On the upper surface side of the back plates 52 and 53,
The upper slide devices 24 and 25 include the cylinder bodies 60 and 61 fixed to the frame 2 side and the cylinder bodies 60 and 6, respectively.
1. Rods 62a, 62b and bracket 63 projecting to the upper side of 1, the vertical connecting rods 64a, 64b connected to the brackets 63a, 63b, and the connecting rods 64a, 64.
The pressing members 65 and 66 fixed to the lower end of b are included. Therefore, the rods 62a and 62b are downward (contraction side)
Moving to the back plate 52,
It descends toward 53.

The operation of the casting apparatus 1 having such a configuration will be described. First, in the casting process, as shown in FIG. 2, the lifting cylinders 18a, 18b and 19a, 1
The rods 39a, 39b and 40a, 40b of 9b and the elevating and lowering drive rods 36, 38 are lowered to the lower limit position, and the molds 3 and 4 are held in a mold clamped state in which casting is possible. In this mold clamped state, the molten metal is injected and pressurized into the cavities 14 and 15 inside the molds 3 and 4, and the casting product W is solidified after a cooling process for a predetermined time by a timer (not shown).

After the casting product W is solidified, a die raising process is performed. In this step, the raising / lowering drive rods 36, 38 are raised as shown in FIG.
9 and upper molds 10 and 11 and insert molds 12 and 13 rise to a predetermined position. At this time, the upper molds 10 and 11 come into contact with the stoppers 20 and 21, so that the upper molds 10 and 11 are prevented from further rising, and the upper molds 10 and 11 are brought into a standby state at a predetermined position together with the shifting molds 8 and 9. Since the stoppers 20 and 21 are arranged so that the heights thereof are different from each other by a predetermined distance, here, the upper mold 11 and the shifting mold 9 are different from each other.
Then, a standby state is set at a predetermined amount above the side of the pulling die 8. That is, in the moving direction of the inner side aligning mold 8D and the inner side aligning mold 9D, the aligning molds 8 and 9 arranged to face each other at the lower limit position.
Since there is no, there will be a withdrawal allowance. The casting product W rises together with the molds 3 and 4 excluding the lower mold 7, and the mold rising process ends.

After the die raising step is completed, a shift die opening step is performed. In this step, the close-up cylinders (28A to 28D) and the close-up cylinders (29A to 29D) are driven. Side cylinders 28A, 28B, 28C
And the side-cylinders 29A, 29B, 29C engage the joint hook 32 with the divided pieces 8A, 8B, 8C of the moving die 8 and the divided pieces 9A, 9B, 9 of the moving die 9 shown in FIG. Each move in the mold release direction. Also, the split piece 8D
5, is engaged with the joint hook 32 of the rod 26 connected to the demolding cylinder 28D, and is moved in the demolding direction (right in the figure), and the split piece 9D is also shown in FIG. As shown, the rod 27 connected to the lean cylinder 29D
The joint hook 33 is engaged with the joint hook 33, and the joint hook 33 is moved in the releasing direction (leftward in the drawing), and the closing mold releasing step is completed.

Thereafter, as shown in FIG. 7, the raising / lowering drive rods 36, 38 are raised again to the upper limit position, whereby the insert molds 12, 13 are moved to the upper limit position. At this time, since the upper molds 10 and 11 are prevented from rising by the stoppers 20 and 21, the insert molds 12 and 13 are prevented.
Only rises relatively to the upper limit position. Moreover, in this case, since the upper end closed edge portion W1 of the cast product W is held by the inner peripheral edge portions 10b and 11b of the upper molds 10 and 11 over substantially the entire circumference thereof, the nesting molds 12 and 13 are relatively moved. When it rises, the convex portions 37 of the insert molds 12, 13 rise while accompanied by a squeezing operation of the inner surface of the cast product W, while the insert molds 12, 13 are separated from the cast product W by a certain distance.

Next, the rod 6 of the cylinder body 60, 61
When 2a and 62b move downward (shrink, etc.), the pressing member 6
5, 66 descend towards the back plates 52, 53,
By the pressing members 65 and 66, the back plate 5
2,53 are pushed down. This allows the push pin 5
Since 0, 51 descends, casting product W
Moves away from the upper molds 10 and 11, and the nesting mold 12,
The cast product W is completely extruded from 13. Then, the cast product W is received by a receiving plate (not shown).

As described above, according to the casting apparatus 1, the two shifting dies 8D and 9D and the upper dies 10 and 11 located inside the two sets of the casting dies 3 and 4 which are closely arranged in parallel with each other are moved up and down. When lifted by 19A, 19B and 20A, 20B, stoppers 20, 21 arranged at different heights from each other
Thus, the upper molds 10 and 11 and the shift molds 8 and 9 stop at the raised position without overlapping each other in a side view. Then, the shift type drive device 2 of the shift type slide devices 22 and 23
When the 8D and 29D are driven, the upper molds 10 and 11 and the shift mold 8,
The divided pieces 8D and 9D of the shift dies 8 and 9 are horizontally moved to the outside of the molds 3 and 4 in the parallel direction via the rods 26 and 27 arranged in a path that does not interfere with the vertical and horizontal movements of the mold 9. Therefore, since the drawing allowances of the divided pieces 8D and 9D can be taken, the divided pieces 8D and 9D can be formed by a metal mold, which is conventionally formed by a sand mold, and the durability of the shifting dies 8 and 9 is improved. In addition, since the molds 3 and 4 do not require the molds 8 and 9 to be exchanged for each casting or frequently molded, the workability is improved and the manufacturing cycle is improved. It is possible to reduce the cost for modeling.

In addition, since the casting apparatus 1 releases the casting product W without moving it when the shifting dies 8 and 9 are released, product defects due to the movement of the casting product W are reduced. Further, when the casting product W is released from the grouping molds 8 and 9, the grouping molds 8,
Without moving with 9, the close-up cylinders 28A and 28B, close-up cylinders 29A to 29D, and the rod 2
The load on 6, 27 can be reduced.

In this embodiment, stoppers 2 are provided on the upper molds 10 and 11.
Although the casting apparatus 1 of the type in which the inserts 12 and 13 are moved by bringing 0 and 21 into contact with each other has been described, it is applicable to the casting apparatus of the type in which the upper molds 10 and 11 move with respect to the shift dies 8 and 9. But of course it doesn't matter.

[0027]

According to the present invention, when two raising molds and an upper mold located inside between two sets of casting devices arranged in parallel close to each other are lifted by an elevating device, they are arranged at different heights from each other. The stoppers stop the upper molds in the raised position without overlapping each other in a side view. When the shifting type driving device of the shifting type sliding device is driven, each shifting type is horizontally moved to the outside in the parallel direction via the rod arranged in a path that does not interfere with the vertical and horizontal movements of the upper mold and the shifting mold. Therefore, since the drawing margins of the two inner closing molds can be taken, the two inner closing molds can be configured by the mold,
The durability of the gathering type is improved. In addition, by using a mold, it is not necessary to exchange the casting mold for each casting or to form it frequently, so that the workability is improved, the manufacturing cycle is improved, and the cost for shaping the casting mold can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a casting apparatus showing an embodiment of the present invention.

FIG. 2 is a side view of the casting apparatus shown in FIG.

FIG. 3 is a plan view showing a configuration of a cross slide device that is a main part of the present invention.

FIG. 4 is a cross-sectional view of a casting apparatus in a state in which a shift mold, a nest mold, and the like are raised.

FIG. 5 is a cross-sectional view of a state in which the closing mold is opened.

FIG. 6 is a plan view showing the operations of the side-by-side slide device and the inner side shift type.

FIG. 7 is a cross-sectional view showing a state in which the insert mold is lifted again.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casting device 7 Lower mold 8, 9 Shift mold 8D, 9D Inner shift mold 10, 11 Upper mold 18, 19 Lifting device 20, 21 Stopper 22, 23 Offset mold slide device 24, 25 Upper slide device 26, 27 Rod 28, 29 Side-by-side drive W Cast products

Claims (2)

[Claims] 1. An upper mold which is vertically movable relative to a lower mold,
A plurality of shifting dies capable of moving in the vertical and horizontal directions, an elevating device for raising and lowering the upper die and the lower dies together with respect to the lower die, and a stopper for stopping the upper die and the closing die at predetermined rising positions A mold slide device that horizontally separates the shifting mold from the casting product cast in the mold at the raised position; and an upper part that vertically separates the upper mold from the casting product at the raised position. Two sets of slide devices are provided, respectively, and the two sets of molds are arranged in close proximity to each other in parallel, and two shift molds located inside the two sets of molds are in a side view with each other in the raised position. So that they don't overlap
The stoppers are arranged at different heights, and the two inner side pulling type slide units are connected to the two pulling types and the two pulling types are horizontally connected via the rods. And a mold driving device for moving the mold, the mold driving device is disposed outside the two casting devices in the parallel direction, and the rods interfere with the vertical and horizontal movements of the upper mold and the shifting mold. A casting device characterized by being placed in a path that does not. 2. The casting apparatus according to claim 1, wherein the offset mold slide device is arranged in the vicinity of a rising position where the upper mold stops.