JP2023164387A - Core driving apparatus, extrusion driving apparatus, and molding machine - Google Patents

Abstract

To provide a core driving apparatus which is capable of realizing weight loss of a working fluid, reduction of power consumption, and reduction of a cycle time.SOLUTION: A core driving apparatus comprises a cylinder tube, a first cover member fixed to one end of the cylinder tube, a second cover member fixed to the other end of the cylinder tube, a first piston provided in the cylinder tube, having a connection part which is capable of connecting a core to one end, a hollow part and an annular flange and passing through the first cover member, and a cylindrical feed pipe provided in the cylinder tube, in which one end is inserted into the hollow part and the other end is fixed to the second cover member, and which communicates the hollow part and the outside of the cylinder tube. The cylinder tube has a first hole communicating a first region in the cylinder tube and the outside of the cylinder tube, and the cylinder tube has a second hole communicating a second region in the cylinder tube and the outside of the cylinder tube.SELECTED DRAWING: Figure 1

Description

The present invention relates to a core drive device, an extrusion drive device, and a molding machine used when manufacturing a product using a mold.

A die-casting machine, which is an example of a molding machine, manufactures products (die-cast products) by using an injection device to fill a cavity in a mold that is clamped using a mold clamping device with molten metal. do. If the product has an undercut in the mold opening/closing direction, a mold with a core is used in addition to a fixed mold and a movable mold.

When using a mold with a core, a core drive device is provided for inserting the core into the fixed mold or movable mold and pulling out the core from the fixed mold or movable mold. provided. It is desirable for core drive devices to reduce the amount of hydraulic fluid, reduce power consumption, and shorten cycle time from the perspective of reducing environmental impact and reducing the manufacturing costs of products manufactured using core drive devices. .

The die casting machine is also provided with an extrusion drive device for extruding the manufactured product from the movable die. Like the core drive device, the extrusion drive device is also desired to reduce the amount of working fluid, reduce power consumption, and shorten cycle time from the viewpoint of reducing product manufacturing costs.

Patent Document 1 describes a multistage cylinder that includes a second piston inside a first piston. Further, Patent Document 2 describes a fluid cylinder including a main piston and a pressure increasing piston. Further, Patent Document 3 describes a cylinder device including a primary piston and a secondary piston.

It is desirable to further reduce the amount of working fluid than when the inventions described in Patent Document 1, Patent Document 2, and Patent Document 3 are used in a core drive device or an extrusion drive device.

Japanese Unexamined Patent Publication No. 1122/1983 Japanese Patent Application Publication No. 8-210310 Japanese Patent Application Publication No. 2000-274403

The problem to be solved by the present invention is to provide a core drive device, an extrusion drive device, and a molding machine that can reduce the amount of working fluid, reduce power consumption, and shorten cycle time.

A core driving device according to one aspect of the present invention includes a cylinder tube, a first cover member fixed to one end of the cylinder tube, a second cover member fixed to the other end of the cylinder tube, and at least A portion thereof is provided inside the cylinder tube, has a connecting portion at one end to which the core can be connected, has a hollow portion closer to the second cover member than the connecting portion, and has a hollow portion closer to the second cover member than the connecting portion a first piston having an annular flange on a side of the second cover member, passing through the first cover member and capable of moving linearly with respect to the cylinder tube; A cylindrical supply pipe provided in a tube, one end of which is inserted into the hollow part, the other end of which is fixed to the second cover member, and communicates the hollow part with the outside of the cylinder tube. , the cylinder tube or the first cover member has a first hole that communicates the outside of the cylinder tube with a first region including a region between the first cover member and the first piston. and the cylinder tube or the second cover member has a second area that communicates the outside of the cylinder tube with a second area including the area between the second cover member and the first piston. It has holes.

In the core drive device of the above aspect, the core drive device is provided in the cylinder tube, the flange is provided inside, and the core drive device is provided to be slidable with the first piston and the cylinder tube, and moves straight with respect to the cylinder tube. further comprising a movable second piston, the first region including a region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston; The second region preferably includes a region surrounded by the cylinder tube, the second cover member, the first piston, the second piston, and the supply pipe.

In the core drive device of the above aspect, a first connection part connected to the first hole and to which a pipe for supplying working fluid to the first region can be connected; and a first connection part connected to the second hole; a second connecting portion to which a pipe for supplying hydraulic fluid to the second region can be connected; and a third connecting portion to which a pipe for supplying hydraulic fluid to the hollow portion can be connected, which is connected to the supply pipe. It is preferable to further include.

In the core drive device of the above aspect, it is preferable that the first piston is slidable with respect to the supply pipe.

The core drive device of the above aspect preferably further includes a sealing material provided between the supply pipe and the second cover member.

In the core drive device of the above aspect, it is preferable that the movable range of the first piston is larger than the movable range of the second piston.

In the core drive device of the above aspect, it is preferable that the inner diameter of the cylinder tube is 100 mm or more.

The core drive device of the above aspect preferably further includes a first pipe connected to the first connection part, and a hydraulic circuit connected to the first pipe and including an accumulator and a switching valve. .

A molding machine according to one aspect of the present invention includes a base, a fixed die plate fixed on the base and holding a fixed mold, and a movable die plate provided on the base so as to be movable in a mold opening/closing direction. a movable die plate that holds the die facing the fixed mold, a core drive device that drives a core combined with the fixed mold and the movable mold, and molds of the fixed mold and the movable mold. A mold clamping device that performs clamping; and an injection device that fills a molten material into a cavity formed by the fixed mold, the movable mold, and the core, and the core driving device includes a cylinder tube. a first cover member fixed to one end of the cylinder tube; a second cover member fixed to the other end of the cylinder tube; and a first cover member fixed to the other end of the cylinder tube; a connecting portion capable of connecting the core, a hollow portion closer to the second cover member than the connecting portion, and an annular flange closer to the second cover member than the connecting portion; a first piston that penetrates the first cover member and is movable in a straight line with respect to the cylinder tube; a first piston that is provided inside the cylinder tube, one end of which is inserted into the hollow part; a cylindrical supply pipe having an end fixed to the second cover member and communicating with the hollow portion and the outside of the cylinder tube, the cylinder tube or the first cover member being connected to the first cover member; The cylinder tube or the second cover member has a first hole that communicates a first region including a region between the cover member and the first piston with the outside of the cylinder tube, and the cylinder tube or the second cover member has a first hole that communicates with the outside of the cylinder tube. The cylinder tube has a second hole that communicates a second region including a region between the second cover member and the first piston with the outside of the cylinder tube.

In the molding machine of the above aspect, the core drive device is provided in the cylinder tube, the flange is provided inside, and is provided to be slidable on the first piston and the cylinder tube, and The method further includes a second piston capable of moving in a straight line relative to the tube, and the first region is surrounded by the cylinder tube, the first cover member, the first piston, and the second piston. The second region preferably includes a region surrounded by the cylinder tube, the second cover member, the first piston, the second piston, and the supply pipe.

In the molding machine of the above aspect, a first pipe is connected to the first hole and supplies the working fluid to the first region, and a first pipe is connected to the supply pipe and supplies the working fluid to the hollow portion. It is preferable to further include a second pipe.

The molding machine of the above aspect preferably further includes an air filter provided in the second hole.

In the molding machine of the above aspect, a first pipe is connected to the first hole and supplies the working fluid to the first region, and a first pipe is connected to the second hole and supplies the working fluid to the second region. It is preferable to further include a second pipe for supplying.

The molding machine of the above aspect preferably further includes an air filter provided in the supply pipe.

An extrusion drive device according to one aspect of the present invention includes a cylinder tube, a first cover member fixed to one end of the cylinder tube, and a second cover member fixed to the other end of the cylinder tube. a first piston having a first rod, a second rod, and an annular flange between the first rod and the second rod; One end of the first rod is fixable to the movable die plate, and the first rod extends through the first cover member and is slidable with respect to the first cover member. , the second rod passes through the second cover member and is slidable relative to the second cover member, and a first piston capable of linear movement relative to the cylinder tube; It is provided in the cylinder tube, the flange is provided inside, it is provided slidably with the first piston and the cylinder tube, the first rod passes through one end, and the flange is provided inside the cylinder tube, and the first rod passes through one end of the cylinder tube. a second piston that can move in a straight line, and the cylinder tube or the first cover member is connected to the cylinder tube, the first cover member, the first piston, and the second piston. A first region surrounded by a piston has a first hole that communicates with the outside of the cylinder tube, and the cylinder tube or the second cover member has a first region surrounded by a piston and a first hole that communicates with the outside of the cylinder tube. It has a second hole that communicates with the outside of the cylinder tube a second region surrounded by the first piston and the second piston.

In the extrusion drive device of the above aspect, it is preferable that the diameter of the second rod is greater than or equal to the diameter of the first rod.

In the extrusion drive device of the above aspect, it is preferable that the diameter of the second rod is larger than the diameter of the first rod.

In the extrusion drive device of the above aspect, a first connection part is connected to the first hole and is connectable to a pipe for supplying the working fluid to the first region; Preferably, the device further includes a second connection portion to which a pipe for supplying the working fluid to the second region can be connected.

A molding machine according to one aspect of the present invention includes a base, a fixed die plate fixed on the base and holding a fixed mold, and a movable die plate provided on the base so as to be movable in a mold opening/closing direction. a movable die plate that holds the die facing the fixed mold, a mold clamping device that clamps the fixed mold and the movable mold, and a cavity formed by the fixed mold and the movable mold. an injection device for filling a molten material therein; and an extrusion drive device for extruding the product formed in the cavity from the movable mold, the extrusion drive device including a cylinder tube and a cylinder tube. a first cover member fixed to one end; a second cover member fixed to the other end of the cylinder tube; a first cover member disposed at least partially within the cylinder tube; and an annular flange between the first rod and the second rod, one end of the first rod being fixable to a movable die plate, The first rod extends through the first cover member and is slidable relative to the first cover member, and the second rod extends through the second cover member and is slidable relative to the first cover member. a first piston that is slidable with respect to a second cover member and capable of linear movement with respect to the cylinder tube; a second piston that is provided to be slidable with respect to the cylinder tube, one end of which is penetrated by the first rod, and which is movable in a straight line with respect to the cylinder tube; The first cover member includes a first region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston, and a first region that communicates with the outside of the cylinder tube. 1 hole,
The cylinder tube or the second cover member includes a second region surrounded by the cylinder tube, the second cover member, the first piston, and the second piston, and an outside of the cylinder tube. It has a second hole that communicates with the second hole.

In the molding machine of the above aspect, it is preferable that the diameter of the second rod is greater than or equal to the diameter of the first rod.

According to the present invention, it is possible to provide a core drive device, an extrusion drive device, and a molding machine that can reduce the amount of working fluid, reduce power consumption, and shorten cycle time.

FIG. 1 is a schematic diagram of a core drive device according to a first embodiment. FIG. 1 is a schematic diagram of a core drive device according to a first embodiment. FIG. 1 is a schematic diagram of a core drive device according to a first embodiment. FIG. 3 is a diagram showing a state in which the core is fixed to the core drive device of the first embodiment. FIG. 2 is an explanatory diagram of the operation of the core drive device according to the first embodiment. FIG. 2 is an explanatory diagram of the operation of the core drive device according to the first embodiment. FIG. 2 is an explanatory diagram of the operation of the core drive device according to the first embodiment. FIG. 2 is an explanatory diagram of the operation of the core drive device according to the first embodiment. FIG. 2 is an explanatory diagram of the operation of the core drive device according to the first embodiment. FIG. 3 is a schematic diagram of a core drive device of a first comparative example. FIG. 3 is a schematic diagram of a core drive device of a first comparative example. The schematic diagram of the core drive device of the modification of 1st Embodiment. FIG. 3 is a schematic diagram of a core drive device according to a second embodiment. FIG. 3 is a schematic diagram of a core drive device according to a second embodiment. FIG. 3 is a schematic diagram of a core drive device according to a second embodiment. FIG. 3 is a schematic diagram of a core drive device according to a second embodiment. FIG. 3 is a schematic diagram of a core drive device according to a third embodiment. FIG. 3 is a schematic diagram of a core drive device according to a third embodiment. FIG. 3 is a schematic diagram of a core drive device according to a third embodiment. FIG. 7 is an explanatory diagram of the operation of the core drive device according to the third embodiment. FIG. 7 is an explanatory diagram of the operation of the core drive device according to the third embodiment. FIG. 7 is an explanatory diagram of the operation of the core drive device according to the third embodiment. FIG. 7 is an explanatory diagram of the operation of the core drive device according to the third embodiment. FIG. 7 is an explanatory diagram of the operation of the core drive device according to the third embodiment. FIG. 7 is an explanatory diagram of the operation of the core drive device according to the third embodiment. FIG. 7 is an explanatory diagram of the operation of the core drive device according to the third embodiment. FIG. 3 is a schematic diagram of a core drive device of a second comparative example. FIG. 3 is a schematic diagram of a core drive device of a second comparative example. FIG. 7 is a schematic diagram of a core drive device according to a modification of the third embodiment. FIG. 4 is a schematic diagram of a core drive device according to a fourth embodiment. FIG. 4 is a schematic diagram of a core drive device according to a fourth embodiment. FIG. 4 is a schematic diagram of a core drive device according to a fourth embodiment. FIG. 4 is a schematic diagram of a core drive device according to a fourth embodiment. FIG. 7 is a schematic diagram showing the overall configuration of a molding machine according to a fifth embodiment. FIG. 7 is a schematic diagram of an extrusion drive device according to a sixth embodiment. FIG. 7 is a schematic diagram of an extrusion drive device according to a sixth embodiment. FIG. 7 is a schematic diagram of an extrusion drive device according to a sixth embodiment. FIG. 7 is a schematic diagram showing the overall configuration of a molding machine according to a sixth embodiment. FIG. 7 is an explanatory diagram of an extrusion drive device and an extrusion operation of a molding machine according to a sixth embodiment. FIG. 7 is an explanatory diagram of an extrusion drive device and an extrusion operation of a molding machine according to a sixth embodiment. FIG. 7 is an explanatory diagram of an extrusion drive device and an extrusion operation of a molding machine according to a sixth embodiment. FIG. 7 is an explanatory diagram of an extrusion drive device and an extrusion operation of a molding machine according to a sixth embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

Note that in this specification, hydraulic pressure will be used as an example of hydraulic pressure. For example, a hydraulic circuit will be described as an example of a hydraulic circuit. For example, it is also possible to use water pressure instead of oil pressure. Further, in this specification, hydraulic oil will be used as an example of the hydraulic fluid.

(First embodiment)
The core drive device of the first embodiment includes a cylinder tube, a first cover member fixed to one end of the cylinder tube, a second cover member fixed to the other end of the cylinder tube, and at least a portion of the cylinder tube. is provided in the cylinder tube, has a connecting portion to which the core can be connected at one end, has a hollow portion closer to the second cover member than the connecting portion, and has a hollow portion closer to the second cover member than the connecting portion. a first piston having an annular flange on the side thereof, passing through the first cover member and capable of linear movement with respect to the cylinder tube; and a first piston provided at least partially inside the cylinder tube and having one end hollow. The cylinder tube includes a cylindrical supply pipe inserted into the cylinder tube, the other end of which is fixed to the second cover member, and which communicates the hollow part with the outside of the cylinder tube. The cylinder tube or the first cover member has a first hole that communicates the outside of the cylinder tube with a first region including a region between the first cover member and the first piston. The second cover member has a second hole that communicates the outside of the cylinder tube with a second region including a region between the second cover member and the first piston.

FIG. 1 is a schematic diagram of a core drive device according to a first embodiment. FIG. 1 shows a cross section of a cylinder unit 10 and a circuit configuration of a hydraulic circuit 12. FIG. 1 shows a case where the first piston 22 is at the retraction limit position.

FIG. 2 is a schematic diagram of the core drive device of the first embodiment. FIG. 2 shows a cross section of the cylinder unit 10. FIG. 2 shows a cross section taken along line AA' in FIG.

FIG. 3 is a schematic diagram of the core drive device according to the first embodiment. FIG. 3 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 3 shows a case where the first piston 22 is at the forward limit position.

The core driving device 100 of the first embodiment inserts a core into a fixed mold or a movable mold of a die-casting machine, and pulls out the core from the fixed mold or a movable mold, for example. The core drive device 100 of the first embodiment is a core drive device driven by hydraulic pressure.

The core drive device 100 includes a cylinder unit 10 and a hydraulic circuit 12 (hydraulic pressure circuit). The cylinder unit 10 and the hydraulic circuit 12 are connected by a first pipe 14 through which hydraulic oil flows.

The cylinder unit 10 includes a cylinder tube 16, a head cover 18 (first cover member), a cap cover 20 (second cover member), a first piston 22, a supply pipe 24, a first connection part 26, a second It includes a connecting portion 28 , a third connecting portion 30 , a first sealing material 32 , a second sealing material 34 , a third sealing material 36 , a first region 38 , and a second region 40 .

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first piston 22 has a coupling 22a (connecting portion), a flange 22b, and a hollow portion 22c.

The hydraulic circuit 12 includes an accumulator 42 and a switching valve 44.

The cylinder unit 10 is an actuator that realizes reciprocating linear motion using hydraulic pressure as an energy source.

The cylinder tube 16 has a cylindrical shape. Cylinder tube 16 extends in a first direction. The inner diameter of the cylinder tube 16 is, for example, 50 mm or more and 150 mm or less. The length of the cylinder tube 16 is, for example, 100 mm or more and 300 mm or less.

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first hole 16a is provided on the head cover 18 side of the cylinder tube 16. The second hole 16b is provided on the cap cover 20 side of the cylinder tube 16. The first hole 16a and the second hole 16b penetrate the cylinder tube 16.

The first hole 16a communicates the first region 38 with the outside of the cylinder tube 16. The second hole 16b communicates the second region 40 with the outside of the cylinder tube 16.

Note that the first hole 16a can also be provided in the head cover 18. Further, the second hole 16b can also be provided in the cap cover 20.

Head cover 18 is fixed to one end of cylinder tube 16. The head cover 18 has an opening through which the first piston 22 passes. For example, a sealing material (not shown) is provided at the contact portion between the head cover 18 and the cylinder tube 16 to prevent leakage of hydraulic oil. The head cover 18 and the cylinder tube 16 may be integrally molded, for example.

The cap cover 20 is fixed to the other end of the cylinder tube 16. The cap cover 20 is provided at the end of the cylinder tube 16 opposite to the head cover 18 . The cap cover 20 has an opening through which the supply pipe 24 passes. For example, a sealing material (not shown) is provided at the contact portion between the cap cover 20 and the cylinder tube 16 to prevent leakage of hydraulic oil. For example, the cap cover 20 and the cylinder tube 16 may be integrally molded.

At least a portion of the first piston 22 is provided within the cylinder tube 16. First piston 22 extends in a first direction.

The first piston 22 has a coupling 22a at one end to which a core can be connected. The first piston 22 has a coupling 22a on the side of the head cover 18 to which a core can be connected. For example, it is possible to screw a fixing jig capable of fixing the core at the tip to the coupling 22a.

The first piston 22 has a flange 22b closer to the cap cover 20 than the coupling 22a. The first piston 22 has, for example, a flange 22b at the end on the cap cover 20 side. The flange 22b is annular.

The first piston 22 has a hollow portion 22c. A portion of the first piston 22 is hollow. At least a portion of the first piston 22 has a cylindrical shape. The length of the hollow portion 22c in the first direction is, for example, 50% or more of the length of the first piston 22 in the first direction.

The first piston 22 penetrates the head cover 18. The first piston 22 is slidable relative to the head cover 18 . A first sealing material 32 is provided at the contact portion between the first piston 22 and the head cover 18 to prevent leakage of hydraulic oil. The first sealing material 32 is, for example, a V-packing.

The first piston 22 is slidable relative to the cylinder tube 16 . A second sealing material 34 is provided at the contact portion between the first piston 22 and the cylinder tube 16 to prevent leakage of hydraulic oil. The second sealing material 34 is, for example, a V-packing.

The first piston 22 is slidable relative to the supply tube 24 . A third sealing material 36 is provided at the contact portion between the first piston 22 and the supply pipe 24 to prevent leakage of hydraulic oil. The third sealing material 36 is, for example, a V-packing.

The first piston 22 is capable of linear movement in a first direction with respect to the cylinder tube 16 and the supply pipe 24.

At least a portion of the supply pipe 24 is provided within the cylinder tube 16. Supply pipe 24 extends in the first direction. The supply pipe 24 is cylindrical. The supply pipe 24 has, for example, a cylindrical shape.

One end of the supply pipe 24 is inserted into the hollow portion 22c. The supply pipe 24 passes through the cap cover 20, for example. The other end of the supply pipe 24 is fixed to the cap cover 20.

The supply pipe 24 communicates the hollow portion 22c with the outside of the cylinder tube 16.

The first region 38 includes the region between the head cover 18 and the flange 22b of the first piston 22. The first area 38 is an area surrounded by the head cover 18, the first piston 22, and the cylinder tube 16. The first region 38 is filled with hydraulic oil.

The second region 40 includes the region between the cap cover 20 and the flange 22b of the first piston 22. The second area 40 is an area surrounded by the cap cover 20, the first piston 22, the supply pipe 24, and the cylinder tube 16. The second region 40 is filled with air.

The first connecting portion 26 is connected to the first hole 16a. The first connecting portion 26 can connect, for example, to a pipe that supplies hydraulic oil to the first region 38 through the first hole 16a. The first connecting portion 26 is provided, for example, on the side surface of the cylinder tube 16 on the head cover 18 side. For example, the first pipe 14 that supplies hydraulic oil is connected to the first connection portion 26 . The first pipe 14 is connected to, for example, the first hole 16a.

The second connecting portion 28 is connected to the second hole 16b. The second connecting portion 28 can connect, for example, an air filter (not shown).

The third connection 30 is connected to the supply pipe 24 . The third connecting portion 30 can connect, for example, a pipe that supplies hydraulic oil to the hollow portion 22c through the supply pipe 24. The third connection portion 30 is provided on the head cover 18, for example. For example, a second pipe 15 for supplying hydraulic oil is connected to the third connection portion 30. The second pipe 15 is connected to the supply pipe 24, for example.

Hydraulic circuit 12 is connected to first piping 14 .

The switching valve 44 controls the flow direction of the hydraulic oil flowing through the hydraulic circuit 12. The switching valve 44 controls the supply of hydraulic oil to the cylinder unit 10 and the return of hydraulic oil from the cylinder unit 10. The switching valve 44 is controlled to open and close, for example, in synchronization with the position of the first piston 22.

The switching valve 44 is, for example, a solenoid valve. The switching valve 44 may be, for example, a servo valve. Further, the switching valve 44 may be a switching valve having a flow rate adjustment function.

The accumulator 42 stores energy using high-pressure sealed gas and instantaneously releases the energy, thereby increasing the flow rate of the hydraulic fluid.

The hydraulic circuit 12 does not include a hydraulic pump or a tank for storing oil. The hydraulic circuit 12 has a so-called pumpless configuration. Note that the hydraulic circuit 12 may include a hydraulic pump and a tank that stores oil.

A hydraulic circuit (not shown) is connected to the second pipe 15. The configuration of the hydraulic circuit connected to the second pipe 15 is not particularly limited. The hydraulic circuit connected to the second pipe 15 has a pumpless configuration, for example, like the hydraulic circuit 12 connected to the first pipe 14. Further, the hydraulic circuit connected to the second pipe 15 may include, for example, a hydraulic pump and a tank for storing oil. The hydraulic circuit connected to the second pipe 15 may share the hydraulic circuit 12 connected to the first pipe 14 using a switching valve.

FIG. 4 is a diagram showing a state in which the core is fixed to the core drive device of the first embodiment.

Core 64 is fixed to first piston 22 . For example, the fixture 54 to which the core 64 is fixed is screwed to the coupling 22a of the first piston 22.

Next, an example of the operation of the core drive device 100 will be described. 5, FIG. 6, FIG. 7, FIG. 8, and FIG. 9 are explanatory diagrams of the operation of the core drive device of the first embodiment. In FIGS. 5 to 9, illustrations of the core 64 and the fixing jig 54 are omitted.

FIG. 5 shows a state in which the first piston 22 is at the retraction limit position. That is, FIG. 5 shows a case where the first piston 22 is located closest to the cap cover 20.

When the first piston 22 is in the backward limit position, the first region 38 is filled with hydraulic oil. In this case, the accumulator 42 of the hydraulic circuit 12 is not filled with hydraulic oil.

First, as shown in FIG. 6, hydraulic oil is supplied from the second pipe 15 to the hollow portion 22c. Furthermore, air flows into the second region 40 from the second hole 16b. This causes the first piston 22 to move forward.

As the first piston 22 moves forward, the hydraulic oil in the first region 38 is pushed out into the first pipe 14, and the accumulator 42 is filled with the hydraulic oil. The switching valve 44 operates in conjunction with the advancement of the first piston 22 and allows hydraulic oil to flow from the first piping 14 to the accumulator 42 .

Next, as shown in FIG. 7, when the flange 22b comes into contact with the head cover 18, the first piston 22 stops. FIG. 7 shows a state in which the first piston 22 is at the forward limit position. When the first piston 22 reaches the forward limit position, insertion of the core 64 into the mold is completed.

Next, as shown in FIG. 8, the accumulator 42 is operated to supply hydraulic oil to the first region 38. The switching valve 44 is switched in a direction to allow hydraulic oil to flow from the accumulator 42 to the first region 38 . Furthermore, air flows out from the second region 40 through the second hole 16b. Further, the hydraulic oil in the hollow portion 22c is discharged through the second pipe 15. This causes the first piston 22 to retreat.

Thereafter, as shown in FIG. 9, the flange 22b comes into contact with the cap cover 20, and the first piston 22 stops. The first piston 22 returns to the retraction limit position.

Next, the functions and effects of the core drive device 100 of the first embodiment will be explained.

When using a mold with a core, a core drive device is provided for inserting the core into the fixed mold or movable mold and pulling out the core from the fixed mold or movable mold. provided. It is desirable for core drive devices to reduce the amount of hydraulic fluid, reduce power consumption, and shorten cycle time from the perspective of reducing environmental impact and reducing the manufacturing costs of products manufactured using core drive devices. .

FIG. 10 is a schematic diagram of a core drive device of a first comparative example. FIG. 10 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 10 shows a case where the first piston 22 is at the retraction limit position.

FIG. 11 is a schematic diagram of a core drive device of a first comparative example. FIG. 11 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 11 shows a case where the first piston 22 is at the forward limit position.

The core driving device 901 of the first comparative example is different from the core of the first embodiment in that the first piston 22 does not have the hollow portion 22c and the cylinder unit 10 does not include the supply pipe 24. This is different from the drive device 100.

The core drive device 901 of the first comparative example inserts the core into a fixed mold or a movable mold of a die-casting machine, and pulls out the core from the fixed mold or the movable mold, for example. The core drive device 901 of the first comparative example is a core drive device driven by hydraulic pressure.

Core drive device 901 includes a cylinder unit 10 and a hydraulic circuit 12. The cylinder unit 10 and the hydraulic circuit 12 are connected by a first pipe 14 through which hydraulic oil flows.

The cylinder unit 10 includes a cylinder tube 16, a head cover 18, a cap cover 20, a first piston 22, a first connecting part 26, a second connecting part 28, a first sealing material 32, a second sealing material 34, It includes a first region 38 and a second region 40.

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first piston 22 has a coupling 22a (connecting portion) and a flange 22b.

The hydraulic circuit 12 includes an accumulator 42 and a switching valve 44.

In the core drive device 901, the first piston 22 moves forward as hydraulic oil is supplied to the second region 40 from the second pipe 15. Moreover, the first piston 22 is moved backward by supplying hydraulic oil from the first pipe 14 to the first region 38 .

In the core drive device 100 of the first embodiment, the first piston 22 includes a hollow portion 22c. The cylinder tube 16 is provided with a supply pipe 24 for supplying hydraulic oil to the hollow portion 22c.

When the first piston 22 of the core drive device 100 of the first embodiment is at the forward limit position (FIG. 3), the sum of the volume of the hollow portion 22c and the volume inside the supply pipe 24 is the first This is smaller than the sum of the volumes of the second regions 40 when the first piston 22 of the core drive device 901 of the comparative example is at the forward limit position (FIG. 11). Therefore, the amount of hydraulic oil that drives the core drive device 100 of the first embodiment can be smaller than the amount of hydraulic oil that drives the core drive device 901 of the first comparative example.

Therefore, the amount of hydraulic oil in the core drive device 100 can be reduced. Further, since the amount of hydraulic oil can be reduced, power consumption can be reduced when, for example, an electric pump is used in a hydraulic circuit. Furthermore, since the amount of hydraulic oil can be reduced, the time required for supplying and discharging the hydraulic oil can be shortened, and cycle time can be shortened.

In addition, in the core drive device 100 of the first embodiment, the driving force when moving the first piston 22 forward is smaller than that of the core drive device 901 of the first comparative example.

Generally, a core drive device requires a large driving force to separate the core from the product. Therefore, a large driving force is required to move the piston backward. On the other hand, when moving the core forward, the driving force is allowed to be smaller than when moving the core backward. Therefore, also in the core drive device 100 of the first embodiment, a reduction in the driving force when moving the first piston 22 forward is allowed.

From the viewpoint of reducing power consumption of the core drive device 100, it is preferable that the hydraulic circuit that drives the cylinder unit 10 has a pumpless configuration like the hydraulic circuit 12.

(Modified example)
FIG. 12 is a schematic diagram of a core drive device according to a modification of the first embodiment. FIG. 12 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 12 shows a case in which the first piston 22 is at the retraction limit position.

The core drive device 101 of the modification of the first embodiment differs from the core drive device 100 of the first embodiment in that it includes an air filter 50 provided in the second hole 16b.

The air filter 50 is attached to the second connection part 28, for example. The air filter 50 may be provided in the second hole 16b, for example.

The core drive device 101 of the modification of the first embodiment includes the air filter 50, thereby preventing dust from entering the second region 40 from the outside.

As described above, according to the first embodiment and the modification, it is possible to provide a core drive device that can reduce the amount of hydraulic fluid, reduce power consumption, and shorten cycle time.

(Second embodiment)
The core drive device of the second embodiment differs from the core drive device of the first embodiment in that it further includes a sealing material provided between the supply pipe and the second cover member. Hereinafter, some descriptions of content that overlaps with the first embodiment may be omitted.

FIG. 13 is a schematic diagram of a core drive device according to the second embodiment. FIG. 13 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 13 shows a case where the first piston 22 is at the retraction limit position.

FIG. 14 is a schematic diagram of a core drive device according to the second embodiment. FIG. 14 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 14 shows a case where the first piston 22 is at the forward limit position.

The core drive device 200 of the second embodiment, for example, inserts a core into a fixed mold or a movable mold of a die-casting machine, and pulls out the core from the fixed mold or movable mold. The core drive device 200 of the second embodiment is a core drive device driven by hydraulic pressure.

The core drive device 200 includes a cylinder unit 10 and a hydraulic circuit 12 (hydraulic pressure circuit). The cylinder unit 10 and the hydraulic circuit 12 are connected by a first pipe 14 through which hydraulic oil flows.

The cylinder unit 10 includes a cylinder tube 16, a head cover 18 (first cover member), a cap cover 20 (second cover member), a first piston 22, a supply pipe 24, a first connection part 26, a second The connecting portion 28, the third connecting portion 30, the first sealing material 32, the second sealing material 34, the third sealing material 36, the fourth sealing material 37 (sealing material), the first region 38, and A second region 40 is included.

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first piston 22 has a coupling 22a (connecting portion), a flange 22b, and a hollow portion 22c.

The hydraulic circuit 12 includes an accumulator 42 and a switching valve 44.

The cylinder unit 10 is an actuator that realizes reciprocating linear motion using hydraulic pressure as an energy source.

A fourth sealing material 37 is provided at the contact portion between the supply pipe 24 and the cap cover 20 to prevent leakage of hydraulic oil. The fourth sealing material 37 is, for example, an O-ring.

The first connecting portion 26 is connected to the first hole 16a. The first connecting portion 26 can connect, for example, to a pipe that supplies hydraulic oil to the first region 38 through the first hole 16a. The first connecting portion 26 is provided, for example, on the side surface of the cylinder tube 16 on the head cover 18 side. For example, the first pipe 14 that supplies hydraulic oil is connected to the first connection portion 26 . The first pipe 14 is connected to, for example, the first hole 16a.

The second connecting portion 28 is connected to the second hole 16b. The second connection portion 28 can connect, for example, a pipe that supplies hydraulic oil to the second region 40 through the second hole 16b. The second connecting portion 28 is provided, for example, on the side surface of the cylinder tube 16 on the cap cover 20 side. For example, the second pipe 15 for supplying hydraulic oil is connected to the second connection portion 28 . The second pipe 15 is connected to, for example, the second hole 16b. Furthermore, it is possible to connect an air filter (not shown) to the second connection portion 28, for example.

The third connection 30 is connected to the supply pipe 24 . The third connecting portion 30 can connect, for example, a pipe that supplies hydraulic oil to the hollow portion 22c through the supply pipe 24. The third connection portion 30 is provided on the head cover 18, for example. For example, a second pipe 15 for supplying hydraulic oil is connected to the third connection portion 30. The second pipe 15 is connected to the supply pipe 24, for example. Moreover, it is possible to connect an air filter (not shown) to the third connection part 30, for example.

Next, a first example of the operation of the core drive device 200 will be described. In the first example of the operation of the core drive device 200, as shown in FIGS. 13 and 14, the second pipe 15 for supplying hydraulic oil is connected to the third connection portion 30. The second pipe 15 is connected to the supply pipe 24.

In the first example, similar to the operation of the core drive device 100 of the first embodiment, hydraulic oil is supplied from the second pipe 15 to the hollow portion 22c. Furthermore, air flows into the second region 40 from the second hole 16b. This causes the first piston 22 to move forward.

Further, in the first example, the accumulator 42 is operated to supply hydraulic oil to the first region 38, similar to the operation of the core drive device 100 of the first embodiment. Furthermore, air flows out from the second region 40 through the second hole 16b. Further, the hydraulic oil in the hollow portion 22c is discharged through the second pipe 15. This causes the first piston 22 to retreat.

FIG. 15 is a schematic diagram of a core drive device according to the second embodiment. FIG. 15 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 15 shows a case where the first piston 22 is at the retraction limit position.

FIG. 16 is a schematic diagram of a core drive device according to the second embodiment. FIG. 16 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 16 shows a case where the first piston 22 is at the forward limit position.

Next, a second example of the operation of the core drive device 200 will be described. In the second example of the operation of the core drive device 200, as shown in FIGS. 15 and 16, the second pipe 15 for supplying hydraulic oil is connected to the second connection portion 28. The second pipe 15 is connected to the second hole 16b. The second example differs from the first example in the position at which the second pipe 15 is connected.

In the second example, hydraulic oil is supplied to the second region 40 from the second pipe 15. Furthermore, air flows into the hollow portion 22c from the supply pipe 24. This causes the first piston 22 to move forward. By providing the fourth sealing material 37, the hydraulic oil supplied to the second region 40 is prevented from leaking to the outside from the contact portion between the supply pipe 24 and the cap cover 20.

In the second example, the accumulator 42 is operated to supply hydraulic oil to the first region 38 . Furthermore, air flows out from the hollow portion 22c through the supply pipe 24. Further, the hydraulic oil in the second region 40 is discharged through the second pipe 15. This causes the first piston 22 to retreat.

Next, the operation and effect of the core drive device 200 of the second embodiment will be explained.

When performing the operation of the first example, the core drive device 200 has the same effects as the core drive device 100 of the first embodiment.

When performing the operation of the second example, the volume of the second region 40 when the first piston 22 of the core drive device 200 is at the forward limit position (FIG. 16) is such that the supply pipe 24 is inside the cylinder tube 16. Therefore, it is smaller than the sum of the volumes of the second regions 40 when the first piston 22 of the core drive device 901 of the first comparative example is at the forward limit (FIG. 11). Therefore, when performing the operation of the second example, the amount of hydraulic oil that drives the core drive device 200 of the second embodiment is changed from the amount of hydraulic oil that drives the core drive device 901 of the first comparative example. You can do less than the amount.

Therefore, in either the first example or the second example, the amount of hydraulic fluid in the core drive device 200 can be reduced. Further, since the amount of hydraulic oil can be reduced, power consumption can be reduced when, for example, an electric pump is used in a hydraulic circuit. Furthermore, since the amount of hydraulic oil can be reduced, the time required for supplying and discharging the hydraulic oil can be shortened, and cycle time can be shortened.

Furthermore, in the case of the second example, the driving force when moving the first piston 22 forward is greater than that in the first example. Therefore, in applications where driving force is required when moving the first piston 22 forward, it is preferable to perform the operation in the second example. In other words, in applications where the load is large when moving the first piston 22 forward, it is preferable to perform the operation of the second example.

Switching between the operation of the first example and the operation of the second example can be performed simply by changing the connection position of the second pipe 15. According to the core drive device 200, by providing the fourth sealing material 37, it becomes possible to easily switch the operation mode according to the load when moving the first piston 22 forward.

For example, when the core drive device 200 is provided above the mold, the load for advancing the first piston 22 is reduced by the gravity applied to the core 64. Therefore, when the core drive device 200 is provided above the mold, it is conceivable to operate the core drive device 200 in the operation of the first example.

On the other hand, for example, when the core drive device 200 is provided below the mold, the load that advances the first piston 22 increases due to the gravity applied to the core 64. Therefore, when the core drive device 200 is provided below the mold, it is conceivable to operate the core drive device 200 in the operation of the second example.

As described above, according to the second embodiment, it is possible to provide a core drive device that can reduce the amount of hydraulic fluid, reduce power consumption, and shorten cycle time.

(Third embodiment)
The core drive device of the third embodiment is provided in a cylinder tube, has a flange provided inside, is provided slidably with the first piston and the cylinder tube, and is not capable of linear movement with respect to the cylinder tube. further comprising a possible second piston, the first region including a region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston, the second region including a region surrounded by the cylinder tube; , a second cover member, a first piston, a second piston, and a region surrounded by a supply pipe, which is different from the core drive device of the first embodiment. Hereinafter, some descriptions of content that overlaps with the first embodiment may be omitted.

FIG. 17 is a schematic diagram of a core drive device according to the third embodiment. FIG. 17 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 17 shows a case where the first piston 22 is at the retraction limit position.

FIG. 18 is a schematic diagram of a core drive device according to the third embodiment. FIG. 18 shows a cross section of the cylinder unit 10. FIG. 18 shows the BB' cross section of FIG. 17.

FIG. 19 is a schematic diagram of a core drive device according to the third embodiment. FIG. 19 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 19 shows a case where the first piston 22 is at the forward limit position.

The core drive device 300 of the third embodiment, for example, inserts the core into a fixed mold or a movable mold of a die-casting machine, and pulls out the core from the fixed mold or the movable mold. The core drive device 300 of the third embodiment is a core drive device driven by hydraulic pressure.

The core drive device 300 includes a cylinder unit 10 and a hydraulic circuit 12 (hydraulic pressure circuit). The cylinder unit 10 and the hydraulic circuit 12 are connected by a first pipe 14 through which hydraulic oil flows.

The cylinder unit 10 includes a cylinder tube 16, a head cover 18 (first cover member), a cap cover 20 (second cover member), a first piston 22, a second piston 23, a supply pipe 24, and a first connection. portion 26, second connecting portion 28, third connecting portion 30, first sealing material 32, second sealing material 34, third sealing material 36, fifth sealing material 39, first region 38 , and a second region 40.

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first piston 22 has a coupling 22a (connecting portion), a flange 22b, and a hollow portion 22c.

The hydraulic circuit 12 includes an accumulator 42 and a switching valve 44.

The cylinder unit 10 is an actuator that realizes reciprocating linear motion using hydraulic pressure as an energy source.

The cylinder tube 16 has a cylindrical shape. Cylinder tube 16 extends in a first direction. The inner diameter of the cylinder tube 16 is, for example, 100 mm or more and 300 mm or less. The length of the cylinder tube 16 is, for example, 150 mm or more and 500 mm or less.

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first hole 16a is provided on the head cover 18 side of the cylinder tube 16. The second hole 16b is provided on the cap cover 20 side of the cylinder tube 16. The first hole 16a and the second hole 16b penetrate the cylinder tube 16.

The first hole 16a communicates the first region 38 with the outside of the cylinder tube 16. The second hole 16b communicates the second region 40 with the outside of the cylinder tube 16.

Note that the first hole 16a can also be provided in the head cover 18. Further, the second hole 16b can also be provided in the cap cover 20.

Head cover 18 is fixed to one end of cylinder tube 16. The head cover 18 has an opening through which the first piston 22 passes. For example, a sealing material (not shown) is provided at the contact portion between the head cover 18 and the cylinder tube 16 to prevent leakage of hydraulic oil. The head cover 18 and the cylinder tube 16 may be integrally molded, for example.

The cap cover 20 is fixed to the other end of the cylinder tube 16. The cap cover 20 is provided at the end of the cylinder tube 16 opposite to the head cover 18 . The cap cover 20 has an opening through which the supply pipe 24 passes. For example, a sealing material (not shown) is provided at the contact portion between the cap cover 20 and the cylinder tube 16 to prevent leakage of hydraulic oil. For example, the cap cover 20 and the cylinder tube 16 may be integrally molded.

At least a portion of the first piston 22 is provided within the cylinder tube 16. First piston 22 extends in a first direction. The first piston 22 is provided inside the second piston 23.

The first piston 22 has a coupling 22a at one end to which a core can be connected. The first piston 22 has a coupling 22a on the side of the head cover 18 to which a core can be connected. For example, it is possible to screw a fixing jig capable of fixing the core at the tip to the coupling 22a.

The first piston 22 has a flange 22b closer to the cap cover 20 than the coupling 22a. The first piston 22 has, for example, a flange 22b at the end on the cap cover 20 side. The flange 22b is annular. The flange 22b is provided inside the second piston 23.

The first piston 22 has a hollow portion 22c. A portion of the first piston 22 is hollow. At least a portion of the first piston 22 has a cylindrical shape. The length of the hollow portion 22c in the first direction is, for example, 50% or more of the length of the first piston 22 in the first direction.

The first piston 22 penetrates the head cover 18. The first piston 22 is slidable relative to the head cover 18 . A first sealing material 32 is provided at the contact portion between the first piston 22 and the head cover 18 to prevent leakage of hydraulic oil. The first sealing material 32 is, for example, a V-packing.

The first piston 22 is slidable relative to the second piston 23. A second sealing material 34 is provided at the contact portion between the first piston 22 and the second piston 23 to prevent leakage of hydraulic oil. The second sealing material 34 is, for example, a V-packing.

The first piston 22 is slidable relative to the supply tube 24 . A third sealing material 36 is provided at the contact portion between the first piston 22 and the supply pipe 24 to prevent leakage of hydraulic oil. The third sealing material 36 is, for example, a V-packing.

The first piston 22 is capable of linear movement in a first direction with respect to the cylinder tube 16, the second piston 23, and the supply pipe 24.

The second piston 23 is provided within the cylinder tube 16. The second piston 23 extends in the first direction.

A portion of the second piston 23 has a cylindrical shape. A portion of the second piston 23 has a hollow shape. The first piston 22 is provided inside the second piston 23. A flange 22b is provided inside the second piston 23.

The second piston 23 is slidable relative to the cylinder tube 16. A fifth sealing material 39 is provided at the contact portion between the second piston 23 and the cylinder tube 16 to prevent leakage of hydraulic oil. The fifth sealing material 39 is, for example, a V-packing.

The second piston 23 is capable of linear movement in the first direction with respect to the cylinder tube 16 and the supply pipe 24. The movable range of the first piston 22 in the first direction is larger than the movable range of the second piston 23 in the first direction. The movable range of the first piston 22 in the first direction is, for example, 4 times or more and 10 times or less of the movable range of the second piston 23 in the first direction.

At least a portion of the supply pipe 24 is provided within the cylinder tube 16. Supply pipe 24 extends in the first direction. The supply pipe 24 is cylindrical. The supply pipe 24 has, for example, a cylindrical shape.

One end of the supply pipe 24 is inserted into the hollow portion 22c. The supply pipe 24 passes through the cap cover 20, for example. The other end of the supply pipe 24 is fixed to the cap cover 20.

The supply pipe 24 communicates the hollow portion 22c with the outside of the cylinder tube 16.

The first region 38 includes the region between the head cover 18 and the flange 22b of the first piston 22. The first region 38 includes the region between the head cover 18 and the second piston 23. The first region 38 is an area surrounded by the head cover 18, the first piston 22, the second piston 23, and the cylinder tube 16. The first region 38 is filled with hydraulic oil.

The second region 40 includes the region between the cap cover 20 and the flange 22b of the first piston 22. The second area 40 is an area surrounded by the cap cover 20, the first piston 22, the second piston 23, the supply pipe 24, and the cylinder tube 16. The second region 40 is filled with air.

The first connecting portion 26 is connected to the first hole 16a. The first connecting portion 26 can connect, for example, to a pipe that supplies hydraulic oil to the first region 38 through the first hole 16a. The first connecting portion 26 is provided, for example, on the side surface of the cylinder tube 16 on the head cover 18 side. For example, the first pipe 14 that supplies hydraulic oil is connected to the first connection portion 26 . The first pipe 14 is connected to, for example, the first hole 16a.

The second connecting portion 28 is connected to the second hole 16b. The second connecting portion 28 can connect, for example, an air filter (not shown).

The third connection 30 is connected to the supply pipe 24 . The third connecting portion 30 can connect, for example, a pipe that supplies hydraulic oil to the hollow portion 22c through the supply pipe 24. The third connection portion 30 is provided on the head cover 18, for example. For example, a second pipe 15 for supplying hydraulic oil is connected to the third connection portion 30. The second pipe 15 is connected to the supply pipe 24, for example.

Hydraulic circuit 12 is connected to first piping 14 .

The switching valve 44 controls the flow direction of the hydraulic oil flowing through the hydraulic circuit 12. The switching valve 44 controls the supply of hydraulic oil to the cylinder unit 10 and the return of hydraulic oil from the cylinder unit 10. The switching valve 44 is controlled to open and close, for example, in synchronization with the position of the first piston 22. The switching valve 44 is, for example, a solenoid valve. The switching valve 44 may be, for example, a servo valve. Further, the switching valve 44 may be a switching valve having a flow rate adjustment function.

The accumulator 42 stores energy using high-pressure sealed gas and instantaneously releases the energy, thereby increasing the flow rate of the hydraulic fluid.

The hydraulic circuit 12 does not include a hydraulic pump or a tank for storing oil. The hydraulic circuit 12 has a so-called pumpless configuration. Note that the hydraulic circuit 12 may include a hydraulic pump and a tank that stores oil.

A hydraulic circuit (not shown) is connected to the second pipe 15. The configuration of the hydraulic circuit connected to the second pipe 15 is not particularly limited. The hydraulic circuit connected to the second pipe 15 has a pumpless configuration, for example, like the hydraulic circuit 12 connected to the first pipe 14. Further, the hydraulic circuit connected to the second pipe 15 may include, for example, a hydraulic pump and a tank for storing oil. The hydraulic circuit connected to the second pipe 15 may be shared with the hydraulic circuit 12 connected to the first pipe 14 using a switching valve.

Next, an example of the operation of the core drive device 300 will be described. 20, FIG. 21, FIG. 22, FIG. 23, FIG. 24, FIG. 25, and FIG. 26 are explanatory diagrams of the operation of the core drive device of the third embodiment. In FIGS. 20 to 26, illustrations of the core 64 and the fixing jig 54 are omitted.

FIG. 20 shows a state in which the first piston 22 is at the backward limit position. That is, FIG. 20 shows a case where the first piston 22 is located closest to the cap cover 20.

When the first piston 22 is in the backward limit position, the first region 38 is filled with hydraulic oil. In this case, the accumulator 42 of the hydraulic circuit 12 is not filled with hydraulic oil.

First, as shown in FIG. 21, hydraulic oil is supplied from the second pipe 15 to the hollow portion 22c. Furthermore, air flows into the second region 40 from the second hole 16b. This causes the first piston 22 to move forward.

As the first piston 22 moves forward, the hydraulic oil in the first region 38 is pushed out into the first pipe 14, and the accumulator 42 is filled with the hydraulic oil. The switching valve 44 operates in conjunction with the advancement of the first piston 22 and allows hydraulic oil to flow from the first piping 14 to the accumulator 42 .

Next, as shown in FIG. 22, the front surface of the flange 22b contacts the second piston 23. Thereafter, the second piston 23 moves forward.

Next, the second piston 23 that has moved forward comes into contact with the head cover 18, so that the first piston 22 and the second piston 23 stop. FIG. 23 shows a state in which the first piston 22 is at the forward limit position. When the first piston 22 reaches the forward limit position, insertion of the core 64 into the mold is completed.

The accumulator 42 is filled with hydraulic oil.

Next, as shown in FIG. 24, the accumulator 42 is operated to supply hydraulic oil to the first region 38. The switching valve 44 is switched in a direction to allow hydraulic oil to flow from the accumulator 42 to the first region 38 . Furthermore, air flows out from the second region 40 through the second hole 16b. Further, the hydraulic oil in the hollow portion 22c is discharged to the outside through the second pipe 15. This causes the first piston 22 and the second piston 23 to retreat.

Thereafter, the second piston 23 that has retreated comes into contact with the cap cover 20. Next, as shown in FIG. 25, only the first piston 22 retreats.

Thereafter, as shown in FIG. 26, the flange 22b comes into contact with the cap cover 20, and the first piston 22 stops. The first piston 22 returns to the retraction limit position.

Next, the operation and effect of the core drive device 300 of the third embodiment will be explained.

When using a mold with a core, a core drive device is provided for inserting the core into the fixed mold or movable mold and pulling out the core from the fixed mold or movable mold. provided. It is desirable for core drive devices to reduce the amount of hydraulic fluid, reduce power consumption, and shorten cycle time from the perspective of reducing environmental impact and reducing the manufacturing costs of products manufactured using core drive devices. .

FIG. 27 is a schematic diagram of a core drive device of a second comparative example. FIG. 27 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 27 shows a case where the first piston 22 is at the retraction limit position.

FIG. 28 is a schematic diagram of a core drive device of a second comparative example. FIG. 28 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 28 shows a case where the first piston 22 is at the forward limit position.

The core driving device 902 of the second comparative example is different from the core of the third embodiment in that the first piston 22 does not have the hollow portion 22c and the cylinder unit 10 does not include the supply pipe 24. This is different from the drive device 300.

The core driving device 902 of the second comparative example inserts the core into a fixed mold or a movable mold of a die-casting machine, and pulls out the core from the fixed mold or the movable mold, for example. The core drive device 902 of the second comparative example is a core drive device driven by hydraulic pressure.

Core drive device 902 includes a cylinder unit 10 and a hydraulic circuit 12. The cylinder unit 10 and the hydraulic circuit 12 are connected by a first pipe 14 through which hydraulic oil flows.

The cylinder unit 10 includes a cylinder tube 16, a head cover 18, a cap cover 20, a first piston 22, a second piston 23, a first connection part 26, a second connection part 28, a first sealing material 32, a first 2 sealant 34 , a fifth sealant 39 , a first region 38 , and a second region 40 .

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first piston 22 has a coupling 22a and a flange 22b.

The hydraulic circuit 12 includes an accumulator 42 and a switching valve 44.

In the core drive device 902, the first piston 22 and the second piston 23 move forward as hydraulic oil is supplied to the second region 40 from the second pipe 15. Moreover, the first piston 22 and the second piston 23 are moved back by supplying hydraulic oil from the first pipe 14 to the first region 38 . By supplying hydraulic oil from the accumulator 42 to the first region 38 through the first pipe 14, the first piston 22 and the second piston 23 are moved back.

At the beginning of retraction, when a large driving force is required to separate the core from the product, a large driving force is obtained by the second piston 23, which has a large area that receives hydraulic pressure. After the core is separated from the product, the second piston 23 stops and the first piston 22 is moved back at a high speed.

By including two pistons, the first piston 22 and the second piston 23, the core drive device 902 can both increase the driving force for separating the core from the product and reduce the amount of hydraulic fluid. Furthermore, the cycle time of the core drive device 902 can be shortened.

In the core drive device 300 of the third embodiment, the first piston 22 includes a hollow portion 22c. The cylinder tube 16 is provided with a supply pipe 24 for supplying hydraulic oil to the hollow portion 22c.

When the first piston 22 of the core drive device 300 of the third embodiment is at the forward limit (FIG. 17), the sum of the volume of the hollow portion 22c and the volume inside the supply pipe 24 is determined by the second comparison. It is smaller than the sum of the volumes of the second regions 40 when the first pistons 22 of the example core drive device 902 are at the forward limit (FIG. 28). Therefore, the amount of hydraulic oil that drives the core drive device 300 of the third embodiment can be smaller than the amount of hydraulic oil that drives the core drive device 902 of the second comparative example.

Therefore, the amount of hydraulic fluid in the core drive device 300 can be reduced. Further, since the amount of hydraulic oil can be reduced, power consumption can be reduced when, for example, an electric pump is used in a hydraulic circuit. Furthermore, since the amount of hydraulic oil can be reduced, the time required for supplying and discharging the hydraulic oil can be shortened, and cycle time can be shortened.

In addition, in the core drive device 300 of the third embodiment, the driving force when moving the first piston 22 and the second piston 23 forward is smaller than that of the core drive device 902 of the second comparative example. .

Generally, a core drive device requires a large driving force to separate the core from the product. Therefore, a large driving force is required to move the piston backward. On the other hand, when moving the core forward, the driving force is allowed to be smaller than when moving the core backward. Therefore, also in the core drive device 300 of the third embodiment, a reduction in the driving force when moving the first piston 22 forward is allowed.

From the viewpoint of reducing power consumption of the core drive device 300, it is preferable that the hydraulic circuit that drives the cylinder unit 10 has a pumpless configuration like the hydraulic circuit 12.

(Modified example)
FIG. 29 is a schematic diagram of a core drive device according to a modification of the third embodiment. FIG. 29 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 29 shows a case where the first piston 22 is at the retraction limit position.

The core drive device 301 of the modification of the third embodiment differs from the core drive device 300 of the third embodiment in that it includes an air filter 50 provided in the second hole 16b.

The air filter 50 is attached to the second connection part 28, for example. The air filter 50 may be provided in the second hole 16b, for example.

The core drive device 301 of the modification of the third embodiment includes the air filter 50, thereby preventing dust from entering the second region 40 from the outside.

As described above, according to the third embodiment and the modification, it is possible to provide a core drive device that can reduce the amount of hydraulic fluid, reduce power consumption, and shorten cycle time.

(Fourth embodiment)
The core drive device of the fourth embodiment differs from the core drive device of the third embodiment in that it further includes a sealing material provided between the supply pipe and the second cover member. Hereinafter, some descriptions of content that overlaps with the third embodiment may be omitted.

FIG. 30 is a schematic diagram of a core drive device according to the fourth embodiment. FIG. 30 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 30 shows a case where the first piston 22 is at the retraction limit position.

FIG. 31 is a schematic diagram of a core drive device according to the fourth embodiment. FIG. 31 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 31 shows a case where the first piston 22 is at the forward limit position.

The core drive device 400 of the fourth embodiment, for example, inserts the core into a fixed mold or a movable mold of a die-casting machine, and pulls out the core from the fixed mold or the movable mold. The core drive device 400 of the fourth embodiment is a core drive device driven by hydraulic pressure.

Core drive device 400 includes a cylinder unit 10 and a hydraulic circuit 12 (hydraulic pressure circuit). The cylinder unit 10 and the hydraulic circuit 12 are connected by a first pipe 14 through which hydraulic oil flows.

The cylinder unit 10 includes a cylinder tube 16, a head cover 18 (first cover member), a cap cover 20 (second cover member), a first piston 22, a second piston 23, a supply pipe 24, and a first connection. portion 26, second connecting portion 28, third connecting portion 30, first sealing material 32, second sealing material 34, third sealing material 36, fourth sealing material 37 (sealing material), 5 sealing material 39, a first region 38, and a second region 40.

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first piston 22 has a coupling 22a (connecting portion), a flange 22b, and a hollow portion 22c.

The hydraulic circuit 12 includes an accumulator 42 and a switching valve 44.

The cylinder unit 10 is an actuator that realizes reciprocating linear motion using hydraulic pressure as an energy source.

A fourth sealing material 37 is provided at the contact portion between the supply pipe 24 and the cap cover 20 to prevent leakage of hydraulic oil. The fourth sealing material 37 is, for example, an O-ring.

The first connecting portion 26 is connected to the first hole 16a. The first connecting portion 26 can connect, for example, a pipe that supplies hydraulic oil to the first region 38 through the first hole 16a. The first connecting portion 26 is provided, for example, on the side surface of the cylinder tube 16 on the head cover 18 side. For example, the first pipe 14 that supplies hydraulic oil is connected to the first connection portion 26 . The first pipe 14 is connected to, for example, the first hole 16a.

The second connecting portion 28 is connected to the second hole 16b. The second connection portion 28 can connect, for example, a pipe that supplies hydraulic oil to the second region 40 through the second hole 16b. The second connecting portion 28 is provided, for example, on the side surface of the cylinder tube 16 on the cap cover 20 side. For example, the second pipe 15 for supplying hydraulic oil is connected to the second connection portion 28 . The second pipe 15 is connected to, for example, the second hole 16b. Furthermore, an air filter (not shown) can be connected to the second connection portion 28, for example.

The third connection 30 is connected to the supply pipe 24 . The third connecting portion 30 can connect, for example, a pipe that supplies hydraulic oil to the hollow portion 22c through the supply pipe 24. The third connection portion 30 is provided on the head cover 18, for example. For example, a second pipe 15 for supplying hydraulic oil is connected to the third connection portion 30. The second pipe 15 is connected to the supply pipe 24, for example. Moreover, an air filter (not shown) can be connected to the third connection part 30, for example.

Next, a first example of the operation of the core drive device 400 will be described. In the first example of the operation of the core drive device 400, as shown in FIGS. 30 and 31, the second pipe 15 for supplying hydraulic oil is connected to the third connection portion 30. The second pipe 15 is connected to the supply pipe 24.

In the first example, similar to the operation of the core drive device 300 of the third embodiment, hydraulic oil is supplied from the second pipe 15 to the hollow portion 22c. Furthermore, air flows into the second region 40 from the second hole 16b. As a result, the first piston 22 and the second piston 23 move forward.

Further, in the first example, the accumulator 42 is operated to supply hydraulic oil to the first region 38, similar to the operation of the core drive device 300 of the third embodiment. Furthermore, air flows out from the second region 40 through the second hole 16b. Further, the hydraulic oil in the hollow portion 22c is discharged through the second pipe 15. This causes the first piston 22 and the second piston 23 to retreat.

FIG. 32 is a schematic diagram of a core drive device according to the fourth embodiment. FIG. 32 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 32 shows a case where the first piston 22 is at the retraction limit position.

FIG. 33 is a schematic diagram of a core drive device according to the fourth embodiment. FIG. 33 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 33 shows a case where the first piston 22 and the second piston 23 are at the forward limit position.

Next, a second example of the operation of the core drive device 400 will be described. In a second example of the operation of the core drive device 400, as shown in FIGS. 32 and 33, the second pipe 15 for supplying hydraulic oil is connected to the second connection portion 28. The second pipe 15 is connected to the second hole 16b. The second example differs from the first example in the position at which the second pipe 15 is connected.

In the second example, hydraulic oil is supplied to the second region 40 from the second pipe 15. Furthermore, air flows into the hollow portion 22c from the supply pipe 24. As a result, the first piston 22 and the second piston 23 move forward. By providing the fourth sealing material 37, the hydraulic oil supplied to the second region 40 is prevented from leaking to the outside from the contact portion between the supply pipe 24 and the cap cover 20.

In the second example, the accumulator 42 is operated to supply hydraulic oil to the first region 38 . Furthermore, air flows out from the hollow portion 22c through the supply pipe 24. Further, the hydraulic oil in the second region 40 is discharged through the second pipe 15. This causes the first piston 22 and the second piston 23 to retreat.

Next, the operation and effect of the core drive device 400 of the fourth embodiment will be explained.

When performing the operation of the first example, the core drive device 400 has the same effects as the core drive device 300 of the third embodiment.

When performing the operation of the second example, the volume of the second region 40 when the first piston 22 of the core drive device 400 is at the forward limit position (FIG. 33) is such that the supply pipe 24 is inside the cylinder tube 16. Therefore, it is smaller than the sum of the volumes of the second regions 40 when the first piston 22 of the core drive device 902 of the second comparative example is at the forward limit position (FIG. 28). Therefore, when performing the operation of the second example, the amount of hydraulic oil that drives the core drive device 400 of the fourth embodiment is the same as that of the hydraulic oil that drives the core drive device 902 of the second comparative example. You can do less than the amount.

Therefore, in either the first example or the second example, the amount of hydraulic fluid in the core drive device 400 can be reduced. Further, since the amount of hydraulic oil can be reduced, power consumption can be reduced when, for example, an electric pump is used in a hydraulic circuit. Furthermore, since the amount of hydraulic oil can be reduced, the time required for supplying and discharging the hydraulic oil can be shortened, and cycle time can be shortened.

Furthermore, in the case of the second example, the driving force when moving the first piston 22 forward is greater than that in the first example. Therefore, in applications where driving force is required when moving the first piston 22 forward, it is preferable to perform the operation in the second example. In other words, in applications where the load is large when moving the first piston 22 forward, it is preferable to perform the operation of the second example.

Switching between the operation of the first example and the operation of the second example can be performed simply by changing the connection position of the second pipe 15. According to the core drive device 400, by providing the fourth sealing material 37, it becomes possible to easily switch the operation mode according to the load when moving the first piston 22 forward.

For example, when the core drive device 400 is provided above the mold, the load for advancing the first piston 22 is reduced by the gravity applied to the core 64. Therefore, when the core drive device 400 is provided above the mold, it is conceivable to operate the core drive device 400 in the operation of the first example.

On the other hand, for example, when the core drive device 400 is provided below the mold, the load for advancing the first piston 22 increases due to the gravity applied to the core 64. Therefore, when the core drive device 400 is provided below the mold, it is conceivable to operate the core drive device 400 in the operation of the second example.

As described above, according to the fourth embodiment, it is possible to provide a core drive device that can reduce the amount of hydraulic fluid, reduce power consumption, and shorten cycle time.

(Fifth embodiment)
The molding machine of the fifth embodiment includes a base, a fixed die plate fixed on the base and holding a fixed mold, and a fixed die plate provided on the base so as to be movable in the mold opening/closing direction and fixing the movable mold. A movable die plate that faces and holds the mold, a core drive device that drives a core combined with the fixed mold and the movable mold, and a mold clamping device that clamps the fixed mold and the movable mold. , an injection device for filling a molten material into a cavity formed by a fixed mold, a movable mold, and a core. The core drive device includes a cylinder tube, a first cover member fixed to one end of the cylinder tube, a second cover member fixed to the other end of the cylinder tube, and at least a portion inside the cylinder tube. a connecting portion to which the core can be connected at one end; a hollow portion on the side closer to the second cover member than the connecting portion; and an annular flange on the side closer to the second cover member than the connecting portion; a first piston that penetrates the first cover member and is movable in a straight line with respect to the cylinder tube; A cylindrical supply pipe is fixed to the cover member of the cylinder tube and communicates between the hollow part and the outside of the cylinder tube. The cylinder tube or the first cover member has a first hole that communicates the outside of the cylinder tube with a first region including a region between the first cover member and the first piston. The second cover member has a second hole that communicates the outside of the cylinder tube with a second region including a region between the second cover member and the first piston. The core drive device included in the molding machine of the fifth embodiment is similar to the core drive device of the first embodiment. Hereinafter, some descriptions of contents that overlap with those of the first embodiment will be omitted.

FIG. 34 is a schematic diagram showing the overall configuration of a molding machine according to the fifth embodiment. FIG. 34 is a side view partially including a cross-sectional view. The molding machine of the fifth embodiment is a die casting machine 500. Die casting machine 500 is a cold chamber type die casting machine.

The die casting machine 500 includes a fixed mold 60, a movable mold 62, a core 64, a mold clamping device 70, an extrusion device 72, an injection device 74, a control section 76, a hydraulic circuit 78, and a core drive device 100. Die casting machine 500 includes a base 82, a fixed die plate 84, a movable die plate 86, a link housing 88, and a tie bar 90.

The die casting machine 500 injects molten metal (molten material), which is a liquid metal, into the inside of a mold (cavity Ca in FIG. 34), which is composed of a fixed mold 60, a movable mold 62, and a core 64. Fill. Then, the die-cast product is manufactured by solidifying the molten metal within the mold. The metal is, for example, aluminum, an aluminum alloy, a zinc alloy, or a magnesium alloy.

The mold includes a fixed mold 60, a movable mold 62, and a core 64. The mold is provided between the mold clamping device 70 and the injection device 74. The core 64 is combined with the fixed mold 60 and the movable mold 62.

A fixed die plate 84 is fixed on the base 82. The fixed die plate 84 can hold the fixed mold 60.

The movable die plate 86 is provided on the base 82 so as to be movable in the mold opening/closing direction. The mold opening/closing direction means both the mold opening direction and the mold closing direction shown in FIG. 34. The movable die plate 86 can hold the movable die 62 facing the fixed die 60.

A link housing 88 is provided on the base 82. One end of a link mechanism that constitutes the mold clamping device 70 is fixed to the link housing 88 .

Fixed die plate 84 and link housing 88 are fixed by tie bars 90. The tie bars 90 support the clamping force while the clamping force is applied to the fixed mold 60 and the movable mold 62.

The mold clamping device 70 has the function of opening and closing the mold and clamping the mold. The injection device 74 has a function of injecting molten metal into the cavity Ca of the mold and pressurizing the molten metal. The extrusion device 72 has a function of extruding the manufactured die-cast product from the mold.

The core drive device 100 has a function of inserting the core 64 into the fixed mold 60 or the movable mold 62 and pulling out the core 64 from the fixed mold 60 or the movable mold 62. The core drive device 100 includes a cylinder unit 10 and a hydraulic circuit 12.

The hydraulic circuit 78 has a function of hydraulically driving, for example, the mold clamping device 70, the extrusion device 72, and the injection device 74. The hydraulic circuit 78 is provided independently of the hydraulic circuit 12 of the core drive device 100, for example.

The control unit 76 has a function of controlling, for example, the mold clamping device 70, the extrusion device 72, the injection device 74, and the core drive device 100. For example, the control unit 76 controls the mold clamping device 70 and the core drive device 100 so that the movable mold 62 and the core 64 move simultaneously.

The control section 76 has a function of performing various calculations and outputting control commands to each section of the die casting machine 500. The control unit 76 has a function of storing, for example, molding conditions and the like.

The control unit 76 is configured by, for example, a combination of hardware and software. The control unit 76 includes, for example, a CPU (Central Processing Unit), a semiconductor memory, and a control program stored in the semiconductor memory.

As described above, according to the fifth embodiment, by including the core drive device 100, it is possible to provide a molding machine that can reduce the amount of working fluid, reduce power consumption, and shorten cycle time.

(Sixth embodiment)
The extrusion drive device of the sixth embodiment includes a cylinder tube, a first cover member fixed to one end of the cylinder tube, a second cover member fixed to the other end of the cylinder tube, and at least a portion of the cylinder tube. A first piston disposed within a tube and having a first rod, a second rod, and an annular flange between the first rod and the second rod, the first piston comprising: a first rod; one end is securable to the movable die plate, the first rod is slidable through and relative to the first cover member, and the second rod is slidable relative to the first cover member. a first piston penetrating the cover member, slidable relative to the second cover member, and capable of linear movement relative to the cylinder tube; and a first piston provided within the cylinder tube and having a flange provided inside. , a second piston that is provided to be slidable with respect to the first piston and the cylinder tube, has one end through which the first rod passes, and is capable of rectilinear movement with respect to the cylinder tube. The cylinder tube or the first cover member has a first hole that communicates the outside of the cylinder tube with a first region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston. The cylinder tube or the second cover member communicates the outside of the cylinder tube with a second region surrounded by the cylinder tube, the second cover member, the first piston, and the second piston. It has a second hole.

FIG. 35 is a schematic diagram of an extrusion drive device according to the sixth embodiment. FIG. 35 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 35 shows a case where the first piston 22 is at the retraction limit position.

FIG. 36 is a schematic diagram of an extrusion drive device according to the sixth embodiment. FIG. 36 shows a cross section of the cylinder unit 10. FIG. 36 shows the CC' cross section of FIG. 35.

FIG. 37 is a schematic diagram of an extrusion drive device according to the sixth embodiment. FIG. 37 shows a cross section of the cylinder unit 10 and a circuit configuration of the hydraulic circuit 12. FIG. 37 shows a case where the first piston 22 is at the forward limit position.

The extrusion drive device 600 of the sixth embodiment, for example, extrudes a product manufactured by a die-casting machine from a movable mold, and separates the product from the movable mold. The extrusion drive device 600 of the sixth embodiment is an extrusion drive device driven by hydraulic pressure.

The extrusion drive device 600 includes a cylinder unit 10 and a hydraulic circuit 12 (hydraulic pressure circuit). The cylinder unit 10 and the hydraulic circuit 12 are connected by a first pipe 14 through which hydraulic oil flows.

The cylinder unit 10 includes a cylinder tube 16, a head cover 18 (first cover member), a cap cover 20 (second cover member), a first piston 22, a second piston 23, a first connecting portion 26, and a first connecting portion 26. 2 connection portions 28 , a first sealing material 32 , a second sealing material 34 , a third sealing material 36 , a fourth sealing material 37 , a first region 38 , and a second region 40 .

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first piston 22 has a first rod 22x, a second rod 22y, and a flange 22z.

The hydraulic circuit 12 includes an accumulator 42 and a switching valve 44.

The cylinder unit 10 is an actuator that realizes reciprocating linear motion using hydraulic pressure as an energy source.

The cylinder tube 16 has a cylindrical shape. Cylinder tube 16 extends in a first direction. The inner diameter of the cylinder tube 16 is, for example, 100 mm or more and 300 mm or less. The length of the cylinder tube 16 is, for example, 150 mm or more and 500 mm or less.

The cylinder tube 16 has a first hole 16a and a second hole 16b. The first hole 16a is provided on the head cover 18 side of the cylinder tube 16. The second hole 16b is provided on the cap cover 20 side of the cylinder tube 16. The first hole 16a and the second hole 16b penetrate the cylinder tube 16.

The first hole 16a communicates the first region 38 with the outside of the cylinder tube 16. The first area 38 is an area surrounded by the cylinder tube 16, head cover 18, first piston 22, and second piston 23.

The second hole 16b communicates the second region 40 with the outside of the cylinder tube 16. The second area 40 is an area surrounded by the cylinder tube 16, the cap cover 20, the first piston 22, and the second piston 23.

Note that the first hole 16a can also be provided in the head cover 18. Further, the second hole 16b can also be provided in the cap cover 20.

Head cover 18 is fixed to one end of cylinder tube 16. The head cover 18 has an opening through which the first rod 22x of the first piston 22 passes. For example, a sealing material (not shown) is provided at the contact portion between the head cover 18 and the cylinder tube 16 to prevent leakage of hydraulic oil. The head cover 18 and the cylinder tube 16 may be integrally molded, for example.

The cap cover 20 is fixed to the other end of the cylinder tube 16. The cap cover 20 is provided at the end of the cylinder tube 16 opposite to the head cover 18 . The cap cover 20 has an opening through which the second rod 22y of the first piston 22 passes. For example, a sealing material (not shown) is provided at the contact portion between the cap cover 20 and the cylinder tube 16 to prevent leakage of hydraulic oil. For example, the cap cover 20 and the cylinder tube 16 may be integrally molded.

At least a portion of the first piston 22 is provided within the cylinder tube 16. First piston 22 extends in a first direction. The first piston 22 is provided inside the second piston 23.

The first piston 22 has a first rod 22x, a second rod 22y, and a flange 22z.

One end of the first rod 22x can be fixed to the movable die plate. Further, the first rod 22x passes through the head cover 18 and is slidable relative to the head cover 18.

A first sealing material 32 is provided at the contact portion between the first rod 22x and the head cover 18 to prevent leakage of hydraulic oil. The first sealing material 32 is, for example, a V-packing.

The second rod 22y passes through the cap cover 20 and is slidable relative to the cap cover 20.

A fourth sealing material 37 is provided at the contact portion between the second rod 22y and the cap cover 20 to prevent leakage of hydraulic oil. The fourth sealing material 37 is, for example, a V-packing.

The flange 22z is provided between the first rod 22x and the second rod 22y. The flange 22z is annular. The flange 22z has, for example, an annular shape. The flange 22z is provided inside the second piston 23.

The first piston 22 is slidable relative to the second piston 23. A second sealing material 34 is provided at the contact portion between the flange 22z of the first piston 22 and the second piston 23 to prevent leakage of hydraulic oil. The second sealing material 34 is, for example, a V-packing.

The first piston 22 is capable of linear movement in a first direction with respect to the cylinder tube 16 and the second piston 23.

The first rod 22x and the second rod 22y are, for example, cylindrical. The diameter of the second rod 22y is, for example, greater than or equal to the diameter of the first rod 22x. The diameter of the second rod 22y is, for example, greater than or equal to the diameter of the first rod 22x.

The diameter of the second rod 22y is, for example, larger than the diameter of the first rod 22x. The diameter of the second rod 22y is, for example, larger than the diameter of the first rod 22x.

The second piston 23 is provided within the cylinder tube 16. The second piston 23 extends in the first direction.

A portion of the second piston 23 has a cylindrical shape. A portion of the second piston 23 has a hollow shape. A portion of the first piston 22 is provided inside the second piston 23. A flange 22z is provided inside the second piston 23.

The second piston 23 is slidable relative to the cylinder tube 16. A third sealing material 36 is provided at the contact portion between the second piston 23 and the cylinder tube 16 to prevent leakage of hydraulic oil. The third sealing material 36 is, for example, a V-packing.

The second piston 23 is capable of linear movement in the first direction with respect to the cylinder tube 16. The movable range of the first piston 22 in the first direction is larger than the movable range of the second piston 23 in the first direction. The movable range of the first piston 22 in the first direction is, for example, 4 times or more and 10 times or less of the movable range of the second piston 23 in the first direction.

The first connecting portion 26 is connected to the first hole 16a. The first connecting portion 26 can connect, for example, to a pipe that supplies hydraulic oil to the first region 38 through the first hole 16a. The first connecting portion 26 is provided, for example, on the side surface of the cylinder tube 16 on the head cover 18 side. For example, the first pipe 14 that supplies hydraulic oil is connected to the first connection portion 26 . The first pipe 14 is connected to, for example, the first hole 16a.

The second connecting portion 28 is connected to the second hole 16b. The second connection portion 28 can connect, for example, a pipe that supplies hydraulic oil to the second region 40 through the second hole 16b. For example, the second pipe 15 for supplying hydraulic oil is connected to the second connection portion 28 .

Hydraulic circuit 12 is connected to first piping 14 .

The switching valve 44 controls the flow direction of the hydraulic oil flowing through the hydraulic circuit 12. The switching valve 44 controls the supply of hydraulic oil to the cylinder unit 10 and the return of hydraulic oil from the cylinder unit 10. The switching valve 44 is controlled to open and close, for example, in synchronization with the position of the first piston 22. The switching valve 44 is, for example, a solenoid valve. The switching valve 44 may be, for example, a servo valve. Further, the switching valve 44 may be a switching valve having a flow rate adjustment function.

The accumulator 42 stores energy using high-pressure sealed gas and instantaneously releases the energy, thereby increasing the flow rate of the hydraulic fluid.

The hydraulic circuit 12 does not include a hydraulic pump or a tank for storing oil. The hydraulic circuit 12 has a so-called pumpless configuration. Note that the hydraulic circuit 12 may include a hydraulic pump and a tank that stores oil.

A hydraulic circuit (not shown) is connected to the second pipe 15. The configuration of the hydraulic circuit connected to the second pipe 15 is not particularly limited. The hydraulic circuit connected to the second pipe 15 has a pumpless configuration, for example, like the hydraulic circuit 12 connected to the first pipe 14. Further, the hydraulic circuit connected to the second pipe 15 may include, for example, a hydraulic pump and a tank for storing oil. The hydraulic circuit connected to the second pipe 15 may be shared with the hydraulic circuit 12 connected to the first pipe 14 using a switching valve.

FIG. 38 is a schematic diagram showing the overall configuration of a molding machine according to the sixth embodiment. FIG. 38 is a side view partially including a cross-sectional view. The molding machine of the sixth embodiment is a die casting machine 700. Die casting machine 700 is a cold chamber type die casting machine.

The die casting machine 700 includes a fixed mold 60, a movable mold 62, a mold clamping device 70, an extrusion device 72, an injection device 74, a control section 76, and a hydraulic circuit 78. Die casting machine 700 includes a base 82, a fixed die plate 84, a movable die plate 86, a link housing 88, and a tie bar 90.

The die casting machine 700 injects and fills the inside of a mold (cavity Ca in FIG. 38), which is composed of a fixed mold 60 and a movable mold 62, with molten metal (molten material), which is a liquid metal. Then, by solidifying the molten metal within the mold, a die-cast product (product) is manufactured. The metal is, for example, aluminum, an aluminum alloy, a zinc alloy, or a magnesium alloy.

The mold includes a fixed mold 60 and a movable mold 62. The mold is provided between the mold clamping device 70 and the injection device 74.

A fixed die plate 84 is fixed on the base 82. The fixed die plate 84 can hold the fixed mold 60.

The movable die plate 86 is provided on the base 82 so as to be movable in the mold opening/closing direction. The mold opening/closing direction means both the mold opening direction and the mold closing direction shown in FIG. 38. The mold opening/closing direction corresponds to the first direction in FIGS. 35 and 37. The movable die plate 86 can hold the movable die 62 facing the fixed die 60.

A link housing 88 is provided on the base 82. One end of a link mechanism that constitutes the mold clamping device 70 is fixed to the link housing 88 .

Fixed die plate 84 and link housing 88 are fixed by tie bars 90. The tie bars 90 support the clamping force while the clamping force is applied to the fixed mold 60 and the movable mold 62.

The mold clamping device 70 has the function of opening and closing the mold and clamping the mold. The injection device 74 has a function of injecting molten metal into the cavity Ca of the mold and pressurizing the molten metal. The extrusion device 72 has a function of extruding the manufactured die-cast product from the mold.

The extrusion device 72 includes an extrusion drive device 600, a cylinder unit support section 72a, an extrusion rod 72b, an extrusion plate 72c, and an extrusion pin 72d.

The extrusion device 72 has a function of extruding the die-cast product solidified within the mold from the movable mold 62. The extrusion device 72 is driven using an extrusion drive device 600.

The cylinder unit support portion 72a supports the cylinder unit 10. For example, the head cover 18 of the cylinder unit 10 is fixed to the cylinder unit support portion 72a.

One end of the first rod 22x of the cylinder unit 10 is fixed to a movable die plate 86.

The extrusion rod 72b is fixed to the cylinder unit support section 72a. The extrusion rod 72b extends in the mold opening/closing direction. The extrusion rod 72b passes through the movable die plate 86.

The extrusion plate 72c is fixed to the extrusion rod 72b. A movable die plate 86 is located between the cylinder unit support portion 72a and the extrusion plate 72c.

The extrusion pin 72d is fixed to the extrusion plate 72c. The extrusion pin 72d passes through the movable mold 62. The extrusion pin 72d directly contacts the die-cast product solidified within the mold and extrudes the die-cast product from the movable mold 62.

The hydraulic circuit 78 has a function of hydraulically driving, for example, the mold clamping device 70, the extrusion device 72, and the injection device 74.

The control unit 76 has a function of controlling, for example, the mold clamping device 70, the extrusion device 72, the injection device 74, and the extrusion drive device 600.

The control section 76 has a function of performing various calculations and outputting control commands to each section of the die casting machine 700. The control unit 76 has a function of storing, for example, molding conditions and the like.

The control unit 76 is configured by, for example, a combination of hardware and software. The control unit 76 includes, for example, a CPU (Central Processing Unit), a semiconductor memory, and a control program stored in the semiconductor memory.

Next, an example of the operation of the extrusion drive device 600 and the die casting machine 700 will be described. FIG. 39, FIG. 40, FIG. 41, and FIG. 42 are explanatory views of the extrusion drive device and extrusion operation of the molding machine of the sixth embodiment.

FIG. 39 is a diagram showing the state immediately after the molten metal has solidified inside the mold consisting of the fixed mold 60 and the movable mold 62 and a die-cast product (product) has been manufactured.

As shown in FIG. 39, the cylinder unit 10 is fixed to the cylinder unit support section 72a. The head cover 18 of the cylinder unit 10 is fixed to the cylinder unit support portion 72a.

Further, one end of the first rod 22x of the first piston 22 is fixed to the link housing 88 side of the movable die plate 86. The first rod 22x passes through the cylinder unit support portion 72a.

Moreover, the extrusion rod 72b is fixed to the cylinder unit support part 72a. The extrusion rod 72b passes through the movable die plate 86.

FIG. 39 shows a state in which the first piston 22 is at the backward limit position. That is, FIG. 39 shows a case where the first piston 22 is located closest to the cap cover 20. In this state, the accumulator 42 is filled with hydraulic oil.

In the state shown in FIG. 39, the extrusion pin 72d that moves in conjunction with the extrusion rod 72b is in direct contact with the die-cast product solidified within the mold.

FIG. 40 is a diagram showing a state in which extrusion of the manufactured die-cast product from the movable mold 62 has started.

As shown in FIG. 40, hydraulic oil is supplied to the first region 38 by operating the accumulator 42. The switching valve 44 is switched in a direction to allow hydraulic oil to flow from the accumulator 42 to the first region 38 . Further, the hydraulic oil in the second region 40 is discharged to the outside through the second hole 16b and the second pipe. This causes the first piston 22 and the second piston 23 to retreat.

As the first piston 22 and the second piston 23 retreat, the cylinder unit support portion 72a moves forward. As the cylinder unit support portion 72a moves forward, the extrusion rod 72b moves forward. As the extrusion rod 72b moves forward, the extrusion pin 72d, which moves in conjunction with the extrusion rod 72b, extrudes the die-cast product from the movable mold 62.

The operation of the accumulator 42 continues, and the retreated second piston 23 contacts the cap cover 20. After that, only the first piston 22 retreats.

As the first piston 22 retreats, the cylinder unit support portion 72a further moves forward. As the cylinder unit support portion 72a moves further forward, the extrusion rod 72b moves further forward. As the extrusion rod 72b moves further forward, the extrusion pin 72d, which moves in conjunction with the extrusion rod 72b, further extrudes the die-cast product from the movable mold 62.

FIG. 41 is a diagram showing a state in which extrusion of the manufactured die-cast product from the movable mold 62 continues and is completed.

As shown in FIG. 41, the first piston 22 stops when the flange 22z comes into contact with the cap cover 20. The first piston 22 reaches the retraction limit position. The state in which the first piston 22 has reached the retracted limit position corresponds to the position in which the push-out pin 72d is most advanced.

Next, hydraulic oil is supplied from the second pipe 15 to the second region 40 . Further, hydraulic oil flows into the second region 40 from the second hole 16b. This causes the first piston 22 to move forward.

As the first piston 22 moves forward, the hydraulic oil in the first region 38 is pushed out into the first pipe 14, and the accumulator 42 is filled with the hydraulic oil. The switching valve 44 operates in conjunction with the advancement of the first piston 22 and allows hydraulic oil to flow from the first piping 14 to the accumulator 42 .

Next, the front surface of the flange 22z of the first piston 22 contacts the second piston 23. Thereafter, the second piston 23 moves forward.

As the first piston 22 and the second piston 23 move forward, the cylinder unit support portion 72a retreats. As the cylinder unit support portion 72a retreats, the extrusion rod 72b retreats. When the extrusion rod 72b retreats, the extrusion pin 72d, which moves in conjunction with the extrusion rod 72b, retreats.

Next, the second piston 23 that has moved forward comes into contact with the head cover 18, so that the first piston 22 and the second piston 23 stop. The first piston 22 returns to the forward limit position.

FIG. 42 shows a state in which the first piston 22 is at the forward limit position. When the first piston 22 returns to the forward limit position, the extrusion operation of the die-cast product using the extrusion device 72 is completed.

Next, the functions and effects of the extrusion drive device 600 and die-casting machine 700 of the sixth embodiment will be explained.

The die casting machine is equipped with an extrusion drive device for extruding the manufactured product from a movable die. From the viewpoint of reducing product manufacturing costs, extrusion drive devices are desired to reduce the amount of working fluid, reduce power consumption, and shorten cycle time.

The extrusion drive device 600 of the sixth embodiment includes a second piston 23 having a large diameter and a first piston 22 having a small diameter and a portion of which is provided inside the second piston 23. Furthermore, the first piston 22 includes a first rod 22x and a second rod 22y with a flange 22z interposed therebetween.

In the extrusion drive device 600, a large driving force is required at the initial stage when extruding the product from the movable mold 62. In other words, in order to separate the product from the movable mold 62, the extrusion drive device 600 requires a large driving force. Therefore, the extrusion drive device 600 requires a large driving force at the initial stage when the extrusion pin 72d is advanced.

On the other hand, once the product is separated from the movable mold 62, the driving force required to advance the extrusion pin 72d is allowed to decrease. Therefore, the driving force of the extrusion drive device 600 is allowed to be small.

In the extrusion drive device 600, when separating the product from the movable mold 62, as shown in FIG. 40, the second piston 23 having a larger diameter is used to retract the first piston 22. By retracting the first piston 22, the extrusion pin 72d is advanced. By using the second piston 23 with a large diameter, a large driving force can be obtained.

In the extrusion drive device 600, after the product is separated from the movable mold 62, only the first piston 22 is retracted, as shown in FIG. 41. Although the driving force is lower than when using the second piston 23 with a larger diameter, it is acceptable.

In the extrusion drive device 600, after the product is separated from the movable mold 62, only the first piston 22, which has a small diameter, is moved back, thereby reducing the amount of hydraulic fluid.

In the extrusion drive device 600, after extruding the product from the movable mold 62, the driving force required for retracting the extrusion pin 72d is allowed to be small. In the extrusion drive device 600, as shown in FIG. 42, after extruding the product from the movable mold 62, the first piston 22 is moved forward. By moving the first piston 22 forward, the push-out pin 72d is moved backward.

In the extrusion drive device 600, when the extrusion pin 72d retreats, the amount of hydraulic oil required to advance the first piston 22 is reduced by the volume of the second rod 22y provided in the first piston 22. becomes possible. Therefore, the amount of hydraulic fluid can be reduced when the push-out pin 72d retreats.

As described above, in the extrusion drive device 600, the amount of hydraulic fluid can be reduced. Further, since the amount of hydraulic oil can be reduced, power consumption can be reduced when, for example, an electric pump is used in a hydraulic circuit. Furthermore, since the amount of hydraulic oil can be reduced, the time required for supplying and discharging the hydraulic oil can be shortened, and cycle time can be shortened.

From the viewpoint of reducing power consumption of the extrusion drive device 600, it is preferable that the hydraulic circuit that drives the cylinder unit 10 has a pumpless configuration like the hydraulic circuit 12.

From the viewpoint of further reducing the amount of hydraulic oil when retracting the push-out pin 72d, the diameter of the second rod 22y is preferably greater than or equal to the diameter of the first rod 22x, and the diameter of the second rod 22y is , is more preferably larger than the diameter of the first rod 22x.

From the viewpoint of further reducing the amount of hydraulic oil when retracting the push-out pin 72d, the diameter of the second rod 22y is preferably greater than or equal to the diameter of the first rod 22x, and the diameter of the second rod 22y is , is more preferably larger than the diameter of the first rod 22x.

From the viewpoint of applying sealing members having the same specifications to the first sealing material 32 and the fourth sealing material 37, it is preferable that the diameter of the second rod 22y is equal to the diameter of the first rod 22x. From the viewpoint of applying sealing members having the same specifications to the first sealing material 32 and the fourth sealing material 37, it is preferable that the diameter of the second rod 22y is equal to the diameter of the first rod 22x.

According to the die casting machine 700 of the sixth embodiment, by including the extrusion drive device 600, it is possible to reduce the amount of working fluid, reduce power consumption, and shorten cycle time.

As described above, according to the sixth embodiment and the modified examples, it is possible to provide an extrusion drive device and a molding machine that can reduce the amount of working fluid, reduce power consumption, and shorten cycle time.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In the embodiment, descriptions of parts such as the core drive device, extrusion drive device, and molding machine that are not directly necessary for the explanation of the present invention are omitted, but the necessary core drive device and extrusion drive device are omitted. , elements related to the molding machine, etc. can be appropriately selected and used.

In the fifth embodiment and the sixth embodiment, the molding machine is a die-casting machine, but the molding machine may be, for example, an injection molding machine that manufactures plastic products.

In the fifth embodiment, the case where the core drive device 100 is fixed to the movable mold 62 has been described as an example, but it is also possible to have a configuration in which the core drive device 100 is fixed to the fixed mold 60. It is.

In the fifth embodiment, the core driving device 100 of the first embodiment is applied to the core driving device. It is also possible to apply a slave drive.

In addition, all core drive devices and molding machines that are equipped with the elements of the present invention and whose designs can be appropriately modified by those skilled in the art are included within the scope of the present invention. The scope of the invention is defined by the claims and their equivalents.

10 Cylinder unit 12 Hydraulic circuit (hydraulic pressure circuit)
14 First piping (piping)
15 Second piping (piping)
16 Cylinder tube 16a First hole 16b Second hole 18 Head cover (first cover member)
20 Cap cover (second cover member)
22 First piston 22a Coupling (connection part)
22b Flange 22c Hollow part 22x First rod 22y Second rod 22z Flange 23 Second piston 24 Supply pipe 26 First connection part 28 Second connection part 30 Third connection part 32 First sealing material 34 Second sealing material 36 Third sealing material 37 Fourth sealing material (sealing material)
38 First region 39 Fifth sealing material 40 Second region 42 Accumulator 44 Switching valve 54 Fixing jig 60 Fixed mold 62 Movable mold 64 Core 70 Clamping device 72 Extrusion device 72a Cylinder unit support section 72b Extrusion Rod 72c Extrusion plate 72d Extrusion pin 74 Injection device 76 Control section 78 Hydraulic circuit 82 Base 84 Fixed die plate 86 Movable die plate 88 Link housing 90 Tie bar 100 Core drive device 200 Core drive device 300 Core drive device 400 Core drive Equipment 500 Die casting machine (molding machine)
600 Extrusion drive device 700 Die casting machine (molding machine)
Ca cavity

Claims (20)

cylinder tube,
a first cover member fixed to one end of the cylinder tube;
a second cover member fixed to the other end of the cylinder tube;
At least a portion thereof is provided inside the cylinder tube, has a connecting portion at one end to which a core can be connected, and has a hollow portion closer to the second cover member than the connecting portion, and the connecting portion a first piston having an annular flange closer to the second cover member than the second cover member, penetrating the first cover member and capable of rectilinear movement with respect to the cylinder tube;
A cylindrical tube, at least a portion of which is provided inside the cylinder tube, one end inserted into the hollow portion, and the other end fixed to the second cover member, communicating the hollow portion with the outside of the cylinder tube. a supply pipe;
The cylinder tube or the first cover member has a first hole that communicates the outside of the cylinder tube with a first region including a region between the first cover member and the first piston. death,
The cylinder tube or the second cover member has a second hole that communicates the outside of the cylinder tube with a second region including a region between the second cover member and the first piston. A core drive device characterized by: A second piston is provided in the cylinder tube, the flange is provided on the inside, the second piston is slidable on the first piston and the cylinder tube, and is movable in a straight line with respect to the cylinder tube. Further prepare,
The first region includes a region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston,
The second region includes a region surrounded by the cylinder tube, the second cover member, the first piston, the second piston, and the supply pipe. Core drive device. a first connection part that is connected to the first hole and can be connected to a pipe that supplies hydraulic fluid to the first region;
a second connection part that is connected to the second hole and can be connected to a pipe that supplies hydraulic fluid to the second region;
The core drive device according to claim 1 or 2, further comprising a third connecting portion connected to the supply pipe and to which a pipe for supplying working fluid to the hollow portion can be connected. 3. The core drive device according to claim 1, wherein the first piston is slidable with respect to the supply pipe. The core drive device according to claim 1 or 2, further comprising a sealing material provided between the supply pipe and the second cover member. The core drive device according to claim 2, wherein a movable range of the first piston is larger than a movable range of the second piston. The core drive device according to claim 2, wherein the inner diameter of the cylinder tube is 100 mm or more. The core according to claim 3, further comprising: a first pipe connected to the first connection portion; and a hydraulic circuit connected to the first pipe and including an accumulator and a switching valve. Drive device. base and
a fixed die plate fixed on the base and holding a fixed mold;
a movable die plate that is provided on the base so as to be movable in the mold opening/closing direction and holds the movable mold facing the fixed mold;
a core drive device that drives a core combined with the fixed mold and the movable mold;
a mold clamping device that clamps the fixed mold and the movable mold;
an injection device for filling a molten material into a cavity formed by the fixed mold, the movable mold, and the core,
The core drive device includes:
cylinder tube,
a first cover member fixed to one end of the cylinder tube;
a second cover member fixed to the other end of the cylinder tube;
At least a portion thereof is provided inside the cylinder tube, has a connecting portion at one end to which the core can be connected, has a hollow portion closer to the second cover member than the connecting portion, and has a hollow portion located closer to the second cover member than the connecting portion; a first piston that has an annular flange on a side closer to the second cover member than the second cover member, penetrates the first cover member, and is capable of linear movement with respect to the cylinder tube;
a cylindrical supply pipe provided in the cylinder tube, one end of which is inserted into the hollow part, the other end of which is fixed to the second cover member, and communicates between the hollow part and the outside of the cylinder tube; Equipped with
The cylinder tube or the first cover member has a first hole that communicates the outside of the cylinder tube with a first region including a region between the first cover member and the first piston. death,
The cylinder tube or the second cover member has a second hole that communicates the outside of the cylinder tube with a second region including a region between the second cover member and the first piston. A molding machine characterized by: The core drive device is provided in the cylinder tube, the flange is provided inside, and the core drive device is provided to be slidable on the first piston and the cylinder tube, and is capable of linear movement with respect to the cylinder tube. further comprising a second piston capable of
The first region includes a region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston,
The second region includes a region surrounded by the cylinder tube, the second cover member, the first piston, the second piston, and the supply pipe. Molding machine. a first pipe connected to the first hole and supplying a working fluid to the first region;
The molding machine according to claim 9 or 10, further comprising a second pipe connected to the supply pipe and supplying a working fluid to the hollow portion. The molding machine according to claim 11, further comprising an air filter provided in the second hole. a first pipe connected to a first connection part connected to the first hole and supplying a working fluid to the first region;
Claim 9 or Claim 10, further comprising a second pipe connected to a second connection part connected to the second hole and supplying a working fluid to the second region. The molding machine described. The molding machine according to claim 13, further comprising an air filter provided in the supply pipe. cylinder tube,
a first cover member fixed to one end of the cylinder tube;
a second cover member fixed to the other end of the cylinder tube;
a first piston disposed at least partially within the cylinder tube and having a first rod, a second rod, and an annular flange between the first rod and the second rod; And,
One end of the first rod can be fixed to a movable die plate,
The first rod passes through the first cover member and is slidable with respect to the first cover member,
The second rod passes through the second cover member and is slidable with respect to the second cover member,
a first piston capable of rectilinear movement with respect to the cylinder tube;
It is provided in the cylinder tube, the flange is provided inside, it is provided slidably with the first piston and the cylinder tube, the first rod passes through one end, and the flange is provided inside the cylinder tube, and the first rod passes through one end of the cylinder tube. a second piston capable of linear movement;
The cylinder tube or the first cover member includes a first region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston, and an outside of the cylinder tube. having a first hole communicating with the
The cylinder tube or the second cover member includes a second region surrounded by the cylinder tube, the second cover member, the first piston, and the second piston, and an outside of the cylinder tube. An extrusion drive device characterized by having a second hole communicating with the. The extrusion drive device according to claim 15, wherein the diameter of the second rod is greater than or equal to the diameter of the first rod. 16. The extrusion drive device according to claim 15, wherein the diameter of the second rod is larger than the diameter of the first rod. a first connection part that is connected to the first hole and can be connected to a pipe that supplies hydraulic fluid to the first region;
a second connection part that is connected to the second hole and can be connected to a pipe that supplies hydraulic fluid to the second region;
The extrusion drive device according to claim 15, further comprising:. base and
a fixed die plate fixed on the base and holding a fixed mold;
a movable die plate that is provided on the base so as to be movable in the mold opening/closing direction and holds the movable mold facing the fixed mold;
a mold clamping device that clamps the fixed mold and the movable mold;
an injection device for filling a molten material into a cavity formed by the fixed mold and the movable mold;
an extrusion drive device that extrudes the product formed in the cavity from the movable mold;
Equipped with
The extrusion drive device includes:
cylinder tube,
a first cover member fixed to one end of the cylinder tube;
a second cover member fixed to the other end of the cylinder tube;
a first piston disposed at least partially within the cylinder tube and having a first rod, a second rod, and an annular flange between the first rod and the second rod; And,
One end of the first rod can be fixed to a movable die plate,
The first rod passes through the first cover member and is slidable with respect to the first cover member,
The second rod passes through the second cover member and is slidable with respect to the second cover member,
a first piston capable of rectilinear movement with respect to the cylinder tube;
It is provided in the cylinder tube, the flange is provided inside, it is provided slidably with the first piston and the cylinder tube, the first rod passes through one end, and the flange is provided inside the cylinder tube, and the first rod passes through one end of the cylinder tube. a second piston capable of linear movement;
The cylinder tube or the first cover member includes a first region surrounded by the cylinder tube, the first cover member, the first piston, and the second piston, and an outside of the cylinder tube. having a first hole communicating with the
The cylinder tube or the second cover member includes a second region surrounded by the cylinder tube, the second cover member, the first piston, and the second piston, and an outside of the cylinder tube. A molding machine characterized by having a second hole communicating with the two. 20. The molding machine according to claim 19, wherein the diameter of the second rod is greater than or equal to the diameter of the first rod.

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