JP2000254767A - Low pressure casting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low pressure casting machine, in which the ejecting force of a product can be made larger than that of the conventional machine without enlarging a cylinder diameter. SOLUTION: This low pressure casting machine is provided with a fixed member 10, a cylinder 20 arranged at the fixed member 10 and provided with a piston 21, an ejecting member 30 ascending/descending by working the cylinder 20 arranged at the tip part of the piston rod 21 and provided with an ejecting pin 31 for ejecting the product, a movable member 40 provided with a movable base 41, a metallic mold 50 fitted to the movable base 41 and having an upper mold 57 and a lower mold 52, and a movable member ascending/descending and stopping device 60, in which in the case of opening/closing the metallic mold 50 by working the cylinder 20, the movable member 40 is ascendable/ descendable together with the ejecting member and in the case of ejecting the product from the metallic mold with the ejecting pin by working the cylinder, the movable member is stopped and the ejecting member is made descendable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a low-pressure casting machine.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional low-pressure casting machine has a fixed platen 81 and an extrusion pin 82 attached to the lower surface of the fixed platen 81 and projecting downward.
And the cylinder 8 provided above the fixed platen 81
3, a movable base 85 provided at a tip of a piston rod 84 of a cylinder 83 and provided with a hole 85a through which a pushing pin 82 is inserted, an upper die 86 mounted on a lower surface of the movable base 85, and an upper die 86 And a lower die 87 disposed opposite to the lower die 87. The upper die 86 is provided with a hole (not shown) which communicates with a hole 85 a provided in the movable base 85 and through which a push pin can be inserted. Lower mold 87
Is provided with a conduit 92 for pouring molten metal into a cavity, which is a product forming section 88 composed of an upper die 86 and a lower die 87. The piston rod 84 moves up and down by the driving of the cylinder 83, and the movable base 85 moves up and down as the piston rod 84 moves up and down. A holding furnace 91 is arranged below the low-pressure casting machine. The holding furnace 91 holds the molten metal and is sealed. A conduit 92 communicating with the lower mold 87 is immersed in the molten metal in the holding furnace. During casting, pressure is applied to the molten metal surface in the holding furnace, so that the molten metal rises in the conduit and is poured into the cavity. When the product is released, the piston rod 84 is raised. As the piston rod 84 rises, the movable base 85 and the upper die 86 attached to the movable base 85 rise. The product is in close contact with the upper die 86. As the movable base 85 continues to rise, the push-out pins 82 attached to the fixed platen 81 move the movable base 85 and the upper die 8.
6 is inserted into the hole and pushes the product. As a result, the product comes off the upper mold.

[0003]

However, the conventional low-pressure caster has the following problems. The pushing force of the product by the pushing pin 82 depends on the rod side B of the cylinder 83. Since the rod side B has a smaller pushing force than the head side A of the cylinder 83, the pushing force is small. Therefore, depending on the product, it is necessary to increase the cylinder diameter to increase the pushing force on the rod side B. However, increasing the cylinder diameter has limitations in terms of equipment. An object of the present invention is to provide a low-pressure casting machine capable of increasing a product pushing force as compared with the related art without increasing a cylinder diameter.

[0004]

The present invention to achieve the above object is as follows. (1) A fixing member, a cylinder provided with a piston rod, provided on the fixing member, and an extrusion provided with an extrusion pin provided at the tip of the piston rod and raised and lowered by the operation of the cylinder to extrude a product. A member, a movable member having a movable base having a through hole through which the push pin is inserted, an upper die attached to the movable base, and having a product molding portion and a hole through which the push pin can enter; A mold that is disposed at a position facing the upper mold and has a lower mold having a product molding portion, and a mold that opens and closes by opening and closing the upper mold with respect to the lower mold by operation of the cylinder; and When actuated and the mold is opened and closed, the movable member can be moved up and down together with the pushing member, and the cylinder is actuated so that the product is ejected from the mold to the pushing pin. When more extruded, the pushing member can be lowered with respect to the movable member,
A low-pressure casting machine comprising: a movable member lifting / lowering / stopping device. (2) The movable member lifting / lowering device includes a first fixing device capable of fixing the movable member to the pushing member, and a second fixing device capable of fixing the movable member to the fixing member. The low pressure casting machine according to (1), wherein the first fixing device operates when the mold is opened and closed, and the second fixing device operates when a product is extruded from the mold. (3) The pushing member includes an pushing plate provided at a tip of the piston rod, and a pushing pin extending downward from the pushing plate, and the first fixing device includes:
A cylinder having a spacer disposed on the upper surface of the movable base and sliding along the upper surface of the movable base; a first member extending upward from the upper surface of the movable base; and a movable base extending from an upper end of the first member. And a hook having a second member that extends in parallel with the direction in which the pushing member extends and is engageable with the pushing member. The movable member is sandwiched between the spacer and the second member of the hook, whereby the movable member is moved. The low-pressure casting machine according to (2), wherein a member is fixed to the extruded member.

In the low-pressure casting machines (1) to (3), when the mold is opened by the operation of the cylinder, the movable member is raised by the movable member lifting / lowering device together with the ascending extruding member. Also, when the mold is closed by the operation of the cylinder, the movable member is lowered by the movable member lifting / lowering device together with the pushing member which is lowered. Further, when the product is extruded by the extruding member while the mold is opened and the cylinder is operated, the extruding member is lowered with respect to the movable member by the movable member elevating / stopping device, and the product is extruded. Therefore, when the product is pushed out, the head side of the cylinder, whose chamber is divided into the head side and the piston rod side, is used. Since the area of the cylinder head is larger than that of the piston rod, the pushing force of the product is increased. Therefore, the product can be extruded with a larger product extruding force without increasing the cylinder diameter as compared with the conventional low-pressure casting machine that used the piston rod side of the cylinder when extruding the product. In the low-pressure casting machine of the above (2), when the mold is opened and closed by the operation of the cylinder, the first member of the movable member lifting / lowering / stopping device is used.
The movable member is fixed to the pushing member by the operation of the fixing device, so that the movable member moves up and down together with the pushing member which moves up and down by the operation of the cylinder. Further, when the product is pushed out, the movable member is fixed to the fixed member by the operation of the second fixing device of the movable member elevating / stopping device. Therefore, the movable member stops without moving with respect to the extruding member which is moved up and down by the operation of the cylinder. Will remain. Therefore, the extruding member descends with respect to the movable member, and the product can be extruded. In the low-pressure casting machine of the above (3), the first fixing device comprises a cylinder having a spacer and a hook, and the extruding plate of the extruding member is sandwiched between the spacer and the hook to fix the movable member to the extruding member. it can. Thereby, it becomes possible for the movable member to move up and down as the pushing member moves up and down.

[0006]

FIG. 1 shows a mold clamping state of a low pressure casting machine according to an embodiment of the present invention, FIG. 2 shows a mold opening state of the low pressure casting machine of the embodiment of the present invention, and FIG. 3 shows an embodiment of the present invention. 1 shows a product extruded state of the low-pressure casting machine of No. 1.

First, a low-pressure casting machine according to an embodiment of the present invention is shown in FIGS.
This will be described with reference to FIG. As shown in FIG. 1, a low-pressure casting machine according to an embodiment of the present invention includes a fixing member 10 and a cylinder 20.
, The extruding member 30, the movable member 40, and the mold 50.
And a movable member lifting / lowering / stopping device 60.

The fixed member 10 has a fixed platen 11. The fixed platen 11 is supported by a column 13 extending upward from the pedestal 12.

The cylinder 20 is fixedly mounted on the upper surface of the fixed platen 11. The cylinder 20 has a piston rod 21. The piston rod 21 extends downward through the fixed platen 11.

The pushing member 30 is provided at the tip of the piston rod 21. Therefore, the pushing member 30 moves up and down in synchronization with the movement of the piston rod 21 by the operation of the cylinder 20. The extruding member 30 includes an extruding pin 31 for extruding the product w. The push pin 31 extends downward from a push plate 32 provided at the tip of the piston rod 21 and extending in parallel with the fixed platen 11.

The movable member 40 has a movable base 41.
The movable base 41 extends in parallel with the fixed platen 11 and has a through hole. An extrusion pin 31 is inserted through the through hole. The movable base 41 includes guide bars 42 extending upward at both ends.

The mold 50 includes an upper mold 51 and a lower mold 52. The upper die 51 has a product forming portion 51 a and a through hole 51 b into which the push pin 31 for pushing out the product w can enter, and is detachably attached to the lower surface of the movable base 41. The through hole 51b communicates with the product forming part 51a.
In the through-hole 51b, an in-mold extrusion member 30 comprising an in-mold extrusion pin 31 'and an in-mold extrusion plate 32' located at the upper end of the in-mold extrusion pin 31 ', which can protrude into the product molding portion 51a. 'Is located. The lower mold 52 has a product forming portion 52a, and is detachably attached to the pedestal 12.

The movable member lifting / stopping device 60 includes a first fixing device 61 and a second fixing device 62,
Is activated, and when the mold 50 is opened and closed, the movable member 40 can be moved up and down together with the pushing member 30.
When the product w is extruded from the mold 50, the movable member 4
For 0, the pushing member 30 can be lowered.

The first fixing device 61 is capable of fixing the movable member 40 to the pushing member 30 and comprises a cylinder 61a and a hook 61c arranged on the movable member 40. The cylinder 61a is disposed on the upper surface of the movable base 41, and approaches the pushing member 30 by the operation of the cylinder 61a.
It has a spacer 61b that slides along the upper surface of the movable base 41 in the direction away from the movable base 41. The hook 61c extends in parallel with the first member 61d extending upward from the upper surface of the movable base 41 and the direction in which the movable base extends from the upper end of the first member 61d toward the piston rod 21.
The second member 61e is engageable with the pushing member 30 (see FIG. 2).

The second fixing device 62 comprises a cylinder 62a capable of fixing the movable member 40 to the fixed member 10. The cylinder 62a is disposed on the fixed platen 11, and the operation of the cylinder 62a causes the guide bar 42 of the movable member 40 to move.
Is provided with an engagement member 62b that can be engaged with the head.

Next, the operation will be described. First, the upper mold 51
The state in which the mold 50 is closed (mold clamping) where the mold 50 and the lower mold 52 are in contact with each other will be described with reference to FIG. At the time of mold clamping, the pushing member 32 of the pushing member 30 is sandwiched between the spacer 61b, which is the first fixing device 61 disposed on the movable member 40, and the second member 61e of the hook 61c. Is fixed to the pushing member 30. Therefore, the movable member 40 is in a state capable of moving up and down together with the piston rod 21 which moves up and down by the operation of the cylinder 20 and the pushing member 30 provided on the piston rod 21.

While the mold is being clamped, the product forming section 5 in the mold 50 is
The molten metal is filled in 1a and 52a. After the filled melt solidifies, the mold 50 is opened.

Next, a case where the mold 50 is opened (mold opening) by raising the upper mold 51 with respect to the lower mold 52 will be described with reference to FIG. When the mold is opened, oil is supplied to the piston rod side chamber B of the cylinder 20,
When the oil is discharged from the head side chamber A, the cylinder 20 operates, and the piston rod 21 rises. At the same time, the pushing member 30 provided on the piston rod 21 and the first fixing device 61 push the pushing member 3
The movable member 40 fixed to 0 also rises. Since the upper die 51 is attached to the movable member 40, the upper die 51 also rises with respect to the fixed lower die 52, and the upper die 51
And the lower mold 52 are separated, and the mold is opened. The solidified product w rises together with the upper mold 52 in a state of being in close contact with the upper mold 51.

Next, a description will be given of the time when the product w is pushed out from the upper die 51 with reference to FIG. When the product is pushed out, the cylinder 62a as the second fixing device 62 is operated, and the engaging member 62b is moved to the guide bar 42.
Engages. Thereby, the movable member 40 is
Fixed to Then, the cylinder 61a as the first fixing device 61 is operated, the spacer 61b is retracted, oil is supplied to the head side chamber A of the cylinder 20, oil is discharged from the piston rod chamber B, and the cylinder 20 is operated. Thereby, the piston rod 21 descends, and at the same time, the pushing member 30 also descends. At this time, the movable member 4
0 is stopped without going up and down. When the extruding member 30 descends with respect to the movable member 40 that is stopped, the extruding pin 31 pushes the in-mold extruding plate 32 ′, and the in-mold extruding pin 31 ′ is attached to the movable member 40 and stopped. The product w is extruded from the product forming portion 51a of the upper die 51. The lowering distance of the pushing member 30 is equal to the vertical thickness of the spacer 61b. In the embodiment of the present invention, the product w is the extrusion member 30 ′ in the mold.
Although the example which is extruded by the extruding member 30 through is shown, it may be extruded directly by the extruding member 30. In this case, since the in-mold extruding member 30 'is not arranged in the mold, the length of the extruding pin 31 of the extruding member 30 is set to a length that can protrude into the product molding portion 51a.

In the low-pressure casting machine of the embodiment of the present invention, the cylinder 20 uses the head side chamber A when clamping the mold, uses the piston rod side chamber B when opening the mold, and uses the head side chamber A when pushing out the product. The head-side chamber A has a larger thrust than the piston rod-side chamber B because of its larger area. Therefore, a large product pushing force can be obtained without increasing the cylinder diameter as compared with a conventional low-pressure casting machine in which the piston rod side chamber B is used at the time of product pushing.

[0021]

According to the low pressure casting machine of the first to third aspects, when the cylinder is operated and the mold is opened, the movable member is raised together with the pushing member by the movable member lifting / lowering device. When the cylinder is operated and the mold is closed, the movable member is lowered together with the pushing member by the movable member lifting / stopping device. Further, when the cylinder is operated with the mold opened and the product is extruded, the extruding member descends with respect to the movable member by the movable member elevating / stopping device, and the product is extruded. When extruding the product, the head side of the cylinder is used, so that the product can be extruded with a larger product extruding force than a conventional low pressure casting machine using the piston rod side. Therefore, it is not necessary to increase the piston diameter in order to increase the product pushing force. According to the low pressure casting machine of the second aspect, when the mold is opened and closed, the movable member is fixed to the extruding member by the operation of the first fixing device of the movable member elevating / stopping device. As a result, the extruding member moves up and down as well as up and down. Also,
When the product is extruded, the movable member is fixed to the fixed member by the operation of the second fixing device of the movable member elevating / stopping device. Therefore, the movable member is stopped without moving even if the extruded member is lowered by the operation of the cylinder. The extruded member moves down with respect to the movable member, and the product is extruded. According to the low pressure casting machine of the third aspect, the first fixing device comprises a cylinder and a hook provided with a spacer, the extruding plate of the extruding member is sandwiched between the spacer and the hook, and the movable member is fixed to the extruding member. Can be. Thereby, it becomes possible for the movable member to move up and down as the pushing member moves up and down.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a state of mold clamping of a low-pressure casting machine according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a low-pressure casting machine according to an embodiment of the present invention in a mold opening state.

FIG. 3 is a schematic cross-sectional view illustrating a low-pressure casting machine according to an embodiment of the present invention when a product is extruded.

FIG. 4 is a schematic sectional view showing a conventional low-pressure casting machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed member 20 Cylinder 21 Piston rod 30 Extruding member 31 Extruding pin 32 Extruding plate 40 Movable member 41 Movable base 50 Die 51 Upper mold 51a Product forming part 51b Hole 52 Lower mold 52a Product forming part 60 Moving member lifting / stopping device 61 First fixing device 61a Cylinder 61b Spacer 61c Hook 61d First member 61e Second member 62 Second fixing device

Claims (3)

[Claims] A fixing member provided on the fixing member;
A cylinder provided with a piston rod, an extruding member provided at a tip of the piston rod and having an extruding pin for elevating and lowering the product by operating the cylinder, and extruding a product; and a movable having a through hole through which the extruding pin is inserted. A movable member having a base, an upper die attached to the movable base and having a hole into which the product forming part and the push-out pin can enter, and a product forming part disposed at a position facing the upper die. A mold that opens and closes by operating the cylinder so that the upper mold moves up and down with respect to the lower mold; and when the cylinder is actuated to open and close the mold, the movable mold The member can be raised and lowered together with the pushing member, and when the cylinder is operated and the product is pushed out of the mold by the pushing pin, A low-pressure casting machine, comprising: a movable member lifting / lowering / stopping device that enables the extruding member to descend with respect to a moving member. 2. The apparatus according to claim 1, wherein said movable member lifting / lowering device comprises a first fixing device capable of fixing said movable member to said pushing member, and a second fixing device capable of fixing said movable member to said fixed member. And when the mold is opened and closed, the first
The low pressure casting machine according to claim 1, wherein the second fixing device is activated when the fixing device is activated and the product is extruded from the mold. 3. The extruding member includes an extruding plate provided at a tip of the piston rod, and an extruding pin extending downward from the extruding plate, wherein the first fixing device is disposed on an upper surface of the movable base, and A cylinder provided with a spacer that slides along an upper surface of the movable base, a first member extending upward from the upper surface of the movable base, and the push-out extending from an upper end of the first member in a direction parallel to a direction in which the movable base extends. A hook having a second member engageable with a member, and fixing the movable member to the pushing member by sandwiching the pushing plate between the spacer and the second member of the hook. The low-pressure casting machine according to claim 2.