JPH1080799A - Hydraulic cushioning device for metallic die mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic cushioning device that is simply structured so as to be integrated with a metallic die mechanism, that dispenses with space for an oil pressure supply system and for piping, and that is capable of reducing price. SOLUTION: A forging device 40 is provided with a cylinder 64 in the lower die holder 56, with a lower die 90 supported through a pin member 88 on a piston 80 that slides inside the cylinder 64. The upper part of the lower die holder 56 is provided with a holding plate 114, to which a relief valve 120, check valve 122 and oil tank 130 are fixed. The cylinder 64, relief valve 120 and check valve 122 are connected with passages 86, 110, 118 formed in the lower die holder 56, while the relief valve 120, check valve 122 and oil tank 130 are connected with a passage 124 formed on the holding plate 114.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is preferably used in a mold mechanism for forming a workpiece by relatively displacing one mold and the other mold, and a hydraulic cushion device for supporting the mold. About.

[0002]

2. Description of the Related Art Conventionally, for example, a mold mechanism for performing forging is provided with a hydraulic cushion device for supporting the mold. This hydraulic cushion device includes a hydraulic cylinder housed in a mold mechanism, and a hydraulic oil supply device that supplies hydraulic oil to the hydraulic cylinder. FIG. 6 shows the pressure oil supply device 10. The pressure oil supply device 10 includes an oil tank 14 provided with a plurality of casters 12.
A valve 16 for discharging pressure oil is provided on one side of the valve. A pump 18 is provided above the oil tank 14, and the pump 18 is driven by a motor 20. As shown in FIG. 7, the input side of the pump 18 communicates with the inside of the oil tank 14 via a filter 22, while the output side of the pump 18 is connected to a relief valve 24,
One end of the collecting block 26 is connected. A pressure gauge 28 is connected to the output side of the pump 18. One end of an oil cooler 30 is connected to the other end of the relief valve 24 and the pipe collecting block 26, and the other end of the oil cooler 30 communicates with the oil tank 14. The oil cooler 30 has an oil outlet 3
2. An oil inlet 34 is provided, and the oil outlet 3
2. The oil inlet 34 communicates with the hydraulic cylinder via a pipe (not shown). The pressure oil supply device 10 further includes an oil temperature gauge 35, a float switch 36, and an air breather 3.
7 are provided.

[0003]

However, in the above prior art, the pressure oil supply device 10 is provided with an oil tank 14,
Pump 18, motor 20, filter 22, relief valve 2
4. Since various devices such as the collecting block 26 and the pressure gauge 28 are incorporated in the apparatus, the apparatus becomes large and must be provided separately from the mold mechanism. Therefore, there is a problem that a special installation space is required for the pressure oil supply device 10, and the price as a hydraulic cushion device is also increased.

Further, since a pipe for supplying pressure oil from the pressure oil supply device 10 to a hydraulic piston housed in a mold mechanism must be provided, more piping space is required, and high pressure oil is also required. There is a demand for high strength piping to be introduced. As a result, the piping itself becomes expensive, and the price of the hydraulic cushion device is further increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a simple structure, is integrated with a mold mechanism, does not require space for a pressure oil supply device and piping, and reduces the cost. It is an object of the present invention to provide a hydraulic cushion device of a mold mechanism capable of performing the above.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a hydraulic mechanism used in a mold mechanism for forming a workpiece by relatively displacing a plurality of dies in a direction approaching each other. In the cushion device, among the plurality of types,
A piston on which at least one mold is supported, a cylinder on which the piston is slidable, a die holder in which the cylinder is housed, and a passage communicating with the piston is defined; And a pressure oil supplied from the oil tank flows through a passage defined in the die holder and is introduced into the cylinder.

According to the present invention, a predetermined pressure is applied to the inside of the cylinder by the pressure oil supplied from the oil tank, and the mold is supported at the predetermined pressure via a piston. When processing a workpiece, the plurality of dies hold the workpiece in a relatively close proximity to each other. The piston is displaced inside the cylinder by the displacement action of the mold, and the pressure oil inside the cylinder is discharged to an oil tank, and the inside of the cylinder is maintained at the predetermined pressure. Therefore, the work is processed by the predetermined pressure.

In this case, the die holder is provided with a relief valve and a check valve communicating with the passage, and when the pressure of the pressure oil inside the piston is controlled by the relief valve and the check valve, the pressure inside the piston is reduced. It is possible to maintain a predetermined pressure with a simple configuration, which is preferable.

In this case, if a guide member is provided inside the oil tank for controlling the flow of the pressure oil introduced into the oil tank to prevent the jet of the pressure oil, the pressure inside the oil tank is reduced. This is preferable because it is possible to prevent the oil from being disturbed and the pressure applied to the piston by the oil tank from fluctuating.

Further, in this case, the oil tank is provided with a float plate floating above the pressurized oil. When the float plate prevents the pressurized oil inside the oil tank from coming into contact with the air, the oil pressure is reduced. This is preferable because the pressure of the air is evenly applied to the surface of the oil, and the deterioration of the pressure oil, such as the pressure oil being oxidized by the air, can be prevented.

Further, in this case, when a compressed air supply source is connected to the oil tank, compressed air is introduced from the compressed air supply source into the oil tank, thereby forming a pressure oil inside the oil tank. Can be applied with a predetermined pressure, which is more preferable.

Further, it is preferable that the die mechanism is a forging device because a small and inexpensive forging device can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a hydraulic cushion device for a mold mechanism according to the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 40 denotes a forging apparatus as a mold mechanism provided with a hydraulic cushion device according to the present embodiment. As shown in FIG. 1, the forging apparatus 40 includes a lower die mounting member 42 and an upper die mounting member 44 which can be relatively close to and separated from the lower die mounting member 42.
Is provided. A hole 46 is defined in the center of the lower die mounting member 42, and a knockout pin 48 is slidably provided in the hole 46. A seating member 50 is mounted on the upper end of the knockout pin 48 so as to be in contact with the knockout pin 48.
The lower end of the lower punch 52 is fixed to the lower part. The lower punch 5
A molding surface 54 is formed at the upper end of 2.

A lower die holder 56 is provided above the lower die mounting member 42. The lower die holder 56 includes a pedestal 58
And a pressing member 60 fixed to the upper portion of the pedestal 58. A hole 62 is defined in the center of the pedestal 58, and a cylindrical cylinder 64 is inserted into the hole 62. The upper die mounting member 44 is provided inside the cylinder 64.
A ring member 66 is provided in contact with the upper part of the ring. O-rings 70a and 70b are provided on the outer and inner circumferences of the ring member 66 to prevent leakage of pressure oil. Inside the ring member 66, there is provided a tubular member 72 on which the knockout pin 48 is slidable, and a hole 74 defined in the tubular member 72 and through which the knockout pin 48 is inserted.
Communicates with a hole 78 whose diameter is increased upward through a stepped portion 76. Therefore, the bottom surface of the seating member 50 contacts the stepped portion 76, and further downward displacement is regulated.

A piston 80 is provided inside the cylinder 64 so as to be able to approach and separate from the ring member 66, and seal rings 82a and 82b made of an elastic material are provided on the outer and inner circumferences of the piston 80. A space 84 is formed between the ring member 66 and the piston 80, and the chamber 84 communicates with a passage 86 defined in the cylinder 64. The passage 86 is bent upward inside the cylinder 64 and opens at an upper portion of the cylinder 64. A plurality of pin members 88 are erected on the upper part of the piston 80, and a lower die 90 is fixed on the upper part of the pin members 88. Accordingly, the lower die 90 is supported by the piston 80, and the lower die 90 is vertically displaced by the piston 80 sliding inside the cylinder 64. The lower die 90
A concave portion 92 is defined at an upper portion of the concave portion, and a tapered portion 94 inclined downward toward the center is formed on a wall portion of the concave portion 92. A molding surface 96 having a predetermined shape is formed at the bottom of the concave portion 92, and a hole 98 through which the lower punch 52 can be inserted is defined at the center of the molding surface 96.

The holding member 60 constituting the lower die holder 56 has a projection 100 formed at a lower portion thereof, and the projection 100 fits into the hole 62. A recess 102 is defined in the upper center of the pressing member 60, and the lower die 90 can move forward and backward with respect to the recess 102. A bulging portion 104 is formed on the lower surface of the bottom of the concave portion 102 so as to abut on the upper portion of the piston 80. Therefore, when the piston 80 rises, it comes into contact with the bulging portion 104 and
Regulate the range of displacement. The bulging portion 104 has a hole 10
The pin member 88 is slidably inserted into the hole 106. On the other hand, a hole 108 is defined at the center of the bottom of the recess 102. The diameter of the hole 108 is larger than the diameter of the seating member 50, and therefore, the seating member 50 passes through the hole 108 as it moves forward and backward.

A passage 110 communicating with a passage 86 defined in the cylinder 64 is formed in the holding member 60.
The upper portion of the passage 110 is formed to be bent in the horizontal direction.
The passage 110 is open at the end of the holding member 60, and this opening is closed by a plug member 112. The passage 110 branches at the point A and extends in the depth direction of FIG.
It is further bent upward to open above the holding member 60.

A holding plate 114 is provided above the holding member 60.
Is fixed to the other end of the holding plate 114, and an L-shaped support member 116 is fixed to the other end of the holding plate 114. The support member 116 is fixed to the wall of the pedestal 58 to support the holding plate 114. The holding plate 114 has the passage 11
A passage 118 communicating with zero is defined. The holding plate 114 is further defined with another passage 124 that opens at the top of the holding plate 114, and the passage 118 and the passage 124 have a relief valve 120 fixed to the top of the holding plate 114 and a relief valve 120. Check valve 122 is connected. The passage 124 is bent inside the holding plate 114, extends in the horizontal direction, and communicates with an opening 126 formed at an end of the holding plate 114, and the opening 126 is closed by a plug member 128. I have. The passage 124 branches upward at a point B and is formed as an opening 125 on the upper surface of the holding plate 114. An oil tank 13 is provided above the holding plate 114.
The oil tank 130 is provided with the opening 12.
Connect to 5.

As shown in FIG. 2, the oil tank 130 has a base 132 at a lower portion thereof, and the base 132 has a hole 134 communicating with the opening 125. The base 132 has a reduced diameter portion 138 formed upward through a step 136, and the reduced diameter portion 138 has an O-ring 140.
Is provided. An oil flow guide member 142 having a substantially T-shaped cross section is provided above the base 132. The oil flow guide member 142 has a curved lower surface, and a part thereof is located above the hole 134. The base 1
32, the cylindrical member 14 is engaged with the step portion 136.
4 is provided, and pressurized oil is introduced into the cylindrical member 144. A float plate 148 configured to float on the pressure oil is provided inside the cylindrical member 144. The outer periphery of the float plate 148 is bent downward to form a cylindrical portion 150, and the cylindrical portion 150 is slidably formed on the inner wall of the tubular member 144. Therefore, the float plate 14
Numeral 8 is capable of vertically displacing the inside of the tubular member 144. The float plate 148 applies the pressure of the compressed air introduced into the oil tank 130 evenly to the pressure oil,
Isolation of the pressure oil from the air prevents the pressure oil from deteriorating due to oxidation or the like.

The upper part of the tubular member 144 is covered with a lid member 152.
Is closed by The lid member 152 has a reduced diameter portion 156 formed below via a step portion 154, and the reduced diameter portion 156 is fitted into the cylindrical member 144. An O-ring 157 is provided on the outer periphery of the reduced diameter portion 156, and the cylindrical member 144 is provided.
To prevent the pressure oil inside from leaking. A hole 158 is defined at the center of the lid member 152.
8 is formed by expanding the diameter upward through the step 160. The hole 158 is provided with an air valve 162, and the step 16
0 engages a step 164 formed on the air valve 162. A tube 166 is connected to the air valve 162, and the tube 166 is connected to a compressed air supply source via a regulator (not shown).

As shown in FIG. 1, a plurality of guide rods 170 are erected on the upper part of the pressing member 60, and a disk-shaped plate member 172 is fixed to the upper part of the guide rod 170 by screws 174. (See FIG. 4). As shown in FIG. 1, the guide rod 170 is slidably inserted into a hole 178 formed in a plate 176 surrounding the lower die 90. The plate 176 has a plurality of screw holes 180 formed in the axial direction thereof.
Reaches the seating portion 182 whose diameter has been increased. A spring post 184 is screwed into the screw hole 180, and the seat 1 182 surrounds the spring post 184 and
One end of 86 is seated.

A disk-shaped support member 188 is supported on the other end of the spring 186 above the plate 176. The support member 188 has the spring post 184 attached thereto.
A slidable hole 190 is defined. A recess 19 communicating with the hole 190 is provided at a lower portion of the support member 188.
2 is defined, and the recess 192 has the spring 186 therein.
Are in contact with each other with elastic force. Therefore, the support member 188 is urged in a direction away from the plate 176. The supporting member 188 is formed with a stepped portion 193 so as to swell downward, and a plurality of air cylinders 194 are disposed on the stepped portion 193 so as to be able to move forward and backward in the horizontal direction. The piston rod 196 of each air cylinder 194
As shown in FIG. 4, the divided mold 200 divided into a plurality of divided molds is fixed to the leading end of the divided mold 200 via an attachment member 198. Therefore, when the air cylinder 194 is urged, each divided mold 200 becomes It is displaced in a direction approaching or moving away from each other. The surfaces of each of the split molds 200 facing each other are shown in FIG.
As shown in FIG. 5, a molding surface 202 is formed. In addition, an inclined surface portion 204 that can be engaged with the tapered portion 94 of the lower mold 90 is formed below the split mold 200.

As shown in FIG. 1, a plate 208 is provided on the support member 188, and the plate 208
The spring post 184 has a slidable hole 21 in it.
0 is defined. The plate 208 is formed with a step 212 bulging upward, and a part of the air cylinder 194 provided in the step 193 is fitted into the step 212. The plate 208 has a hole 21 through which the guide rod 170 is inserted as shown by a broken line in FIG.
4 is defined, and the diameter of the upper part of the hole 214 is increased through a step 216. The plate member 172 is configured to be able to abut on the step portion 216, and thus the upward displacement of the plate 208 is restricted. The plate 20
A hole 218 is defined at the center of 8, and a ring-shaped intermediate mold 220 is fitted into the hole 218. A hole formed at a substantially central portion of the intermediate mold 220 functions as a molding surface 222.

An upper die holder 230 is fixed to a lower portion of the upper die mounting member 44. A hole 232 is defined in the center of the upper die holder 230, and a step 234 is formed in a wall forming the hole 232. A base 236 is inserted into the hole 232. Here, a flange portion 238 is formed on the outer periphery of the base 236, and the flange portion 238 is formed.
8 engages with the stepped portion 234, so that the pedestal 2
36 is prevented from dropping out of the hole 232. A holding member 240 is fixed to the lower part of the upper die holder 230 so as to surround the pedestal 236, and a step 244 is formed in a hole 242 of the holding member 240. A ring-shaped support member 246 is inserted into the hole 242, and the support member 2
46, a flange portion 2 engaging with the step portion 244
48 are formed. An upper die 252 is inserted into the hole 250 of the support member 246, a hole 254 is defined in the center of the upper die 252, and a molding surface 256 is formed below a wall forming the hole 254. Is formed. An upper punch 258 is inserted into the hole 254, and a molding surface 260 is formed below the upper punch 258.

The lower punch 52, the lower die 90, and the split die 20
A long cavity 262 is formed by the molding surfaces 54, 96, 202, 222, 256, and 260 of the intermediate mold 220, the upper mold 252, and the upper punch 258 (see FIG. 4).

Next, a hydraulic circuit of the hydraulic cushion device according to the present embodiment will be described with reference to FIG. The cylinder 64 provided in the forging apparatus 40 is connected to the input side of the relief valve 120 and the output side of the check valve 122 via passages 86, 110, 118. The output side of the relief valve 120 and the input side of the check valve 122 are connected to an oil tank 130 via a passage 124. When the pressure on the input side, that is, the pressure inside the cylinder 64 exceeds a predetermined value, the relief valve 120 causes the pressure oil to flow from the input side to the output side. For this reason, the relief valve 120 is adjusted so that the pressure on the input side does not exceed a predetermined pressure. The check valve 122 has a pressure on the output side (cylinder 64 side) on the input side (oil tank 130).
When the pressure becomes lower than the pressure on the side, the pressure oil is supplied from the input side to the output side, and on the other hand, the function is such that the pressure oil does not flow from the output side to the input side regardless of the pressure on the input side and the output side. The upper part of the oil tank 130 is connected to a compressed air supply source (not shown) via a controller 263.
Adjusts the amount of compressed air supplied from the compressed air supply source and supplies it to the oil tank 130.

The oil tank 130 is provided with a level gauge 264 and an oil temperature gauge 266, and the cylinder 64 is further provided with an oil pressure gauge 268.

The forging apparatus 40 according to the present embodiment comprises:
Basically, the configuration is as described above. Next, the operation will be described in relation to the forging method according to the present embodiment.

First, as shown in FIG.
4 is displaced in a direction away from the lower mold mounting member 42, the piston rod 196 of the air cylinder 194 is retracted, and each split mold 200 is displaced in a direction away from each other. Therefore, as shown in FIG.
30 is supplied with compressed air from a compressed air supply source (not shown) via a regulator 263, and the pressure inside the oil tank 130 increases. Therefore, the pressurized oil is stored in the oil tank 13.
0 through the check valve 122 and into the cylinder 64, the piston 80 is displaced upward and
(See FIG. 1). It is assumed that the work 270 used here is formed in a substantially rod shape in advance.

After the above preparation steps, the work 27
0 is inserted into the hole 98 of the lower mold 90, and the work 2
The lower end of 70 is positioned in contact with the molding surface 54 of the lower punch 52. Next, when the plurality of air cylinders 194 are urged, as shown in FIG. 3, the split molds 200 are displaced in directions approaching each other, and the work 270 is held by the forming surface 202 of the split mold 200. At this time, the work 270
Of the work 270 is positioned at the center of the cavity 262.

Next, when the upper die mounting member 44 approaches the lower die mounting member 42, the lower part of the upper die 252 presses the upper part of the intermediate die 220, and the intermediate die 220 and the support member 188 exert the elastic force of the spring 186. Displaces downward against For this reason, the inclined surface portion 204 of the split mold 200 is engaged with the tapered portion 94 of the lower mold 90, and the respective split molds 200 are urged in directions approaching each other.

When the upper mold mounting member 44 is further displaced, a load is applied to the piston 80 downward, and the pressure inside the cylinder 64 increases (see FIG. 5). When the pressure exceeds a predetermined value, the relief valve 120 opens, and the pressure oil flows from the cylinder 64 to the oil tank 130 to release the pressure inside the cylinder 64. For this reason, the inside of the cylinder 64 is maintained at a predetermined pressure and the piston 80 descends,
As shown in FIG. 4, the lower mold 90 descends via the pin member 88. Then, the lower punch 52 is relatively displaced, and the molding surface 54 enters the inside of the cavity 262, and presses the work 270 to form the molding surfaces 54, 96, 202, 222,
The work 270 is forged. At this time, since the split molds 200 are urged in the directions approaching each other as described above, the cavity 2
Even if the internal pressure of 62 rises, there is no concern that the internal pressure will be separated from each other.

At this time, there is a concern that the pressurized oil jets from the hole 134 into the oil tank 130 as shown in FIG. When such a jet occurs, the oil tank 13
The pressure oil inside the oil tank 130 is disturbed, the pressure inside the oil tank 130 fluctuates, and this pressure fluctuation is transmitted to the relief valve 120, and there is a concern that the pressure oil may not be discharged well from the piston 80. Therefore, the oil tank 13
The pressure oil that has flowed into 0 is guided to a predetermined path by the oil flow guide member 142, so that the pressure oil is not disturbed.
The occurrence of pressure fluctuations is prevented.

After the work 270 is forged, the load applied to the piston 80 is reduced when the upper die mounting member 44 is raised, the pressure inside the piston 80 is reduced, and the oil is removed from the oil tank 130 through the check valve 122. Pressure oil is introduced. For this reason, the piston 80 is displaced and the lower mold 90 is raised. The support member 188 is a spring 1
Due to the resilience of the plate 86, it is displaced away from the plate 176, and the engagement between the inclined surface portion 204 of the split mold 200 and the tapered portion 94 of the lower mold 90 is released. Next, the air cylinder 194 is urged to displace each of the split dies 200 in a direction away from each other. When the knockout pin 48 rises, the forged workpiece 270 is taken out of the cavity 262 under the ascending action of the lower punch 52, and is transported to the next step by a transport device (not shown) or the like.

[0036]

According to the hydraulic cushion device for a mold mechanism according to the present invention, the following effects and advantages can be obtained.

Since the oil tank is provided in the die holder, and the passage connecting the oil tank and the piston is formed in the die holder, a mold mechanism provided with the hydraulic cushion device can be simply constructed. The space for the pressure oil supply device and the piping, which is required in the hydraulic cushion device according to the technology, becomes unnecessary. Therefore, the cost of the mold can be reduced, and the space in a factory or the like where the mold is used can be effectively used.

Furthermore, the oil flow guide member prevents the pressurized oil from jetting into the oil tank,
Since the pressure of the compressed air is evenly applied to the pressure oil by the float plate floating on the pressure oil in the oil tank, the piston is stably supported at the predetermined pressure. Therefore, a stable molding process is performed by this mold mechanism, and the effect of further improving the quality of the molded product is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a forging device using a hydraulic cushion device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an oil tank used in the forging apparatus of FIG.

FIG. 3 is a longitudinal sectional view showing a method of using the forging apparatus of FIG. 1, in which a workpiece is held by a split mold.

FIG. 4 is a longitudinal sectional view showing a method of using the forging apparatus of FIG. 1, which is in a state of being forged on a work.

FIG. 5 is a hydraulic circuit diagram of the forging apparatus of FIG. 1;

FIG. 6 is a side view showing a pressure oil supply device used in a hydraulic cushion device according to the related art.

FIG. 7 is a hydraulic circuit diagram of the pressure oil supply device of FIG.

[Explanation of symbols]

40 ... Forging device 56 ... Lower die holder 64 ... Cylinder 80 ... Piston 86, 118 ... Passage 90 ... Lower mold 120 ... Relief valve 122 ... Check valve 130 ... Oil tank 142 ... Oil flow guide member 148 ... Float plate

Continued on the front page (72) Inventor Shuichi Yamane 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Akihiko Minowa 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. In company

Claims (6)

[Claims] 1. A hydraulic cushion device used in a mold mechanism for forming a workpiece by relatively displacing a plurality of dies in a direction approaching each other, wherein at least one of the plurality of dies is supported. A piston that is slidable; a die holder in which the cylinder is housed, and a passage communicating with the piston is defined; and an oil tank provided in the die holder and communicating with the passage. And a pressure oil supplied from the oil tank is introduced into the cylinder through a passage defined in the die holder, and is introduced into the cylinder. 2. The hydraulic cushion device for a mold mechanism according to claim 1, wherein the die holder is provided with a relief valve and a check valve communicating with the passage, and the pressure of the pressure oil inside the piston is reduced by the relief valve and the check valve. A hydraulic cushion device for a mold mechanism, which is controlled by a check valve. 3. The hydraulic cushion device for a mold mechanism according to claim 1, wherein a flow of pressure oil introduced into the oil tank is controlled inside the oil tank to prevent a jet of the pressure oil. A hydraulic cushion device for a mold mechanism, wherein a guide member is provided. 4. The hydraulic cushion device for a mold mechanism according to claim 1, wherein the oil tank is provided with a float plate floating above the pressurized oil, and the float plate is provided by the float plate. A hydraulic cushion device for a mold mechanism, which prevents pressure oil and air inside an oil tank from coming into contact with each other. 5. The hydraulic cushion device for a mold mechanism according to claim 1, wherein a compressed air supply source is connected to said oil tank, and said oil tank is connected to said oil tank by said compressed air supply source. A hydraulic cushion device for a mold mechanism, wherein a predetermined pressure is applied to pressurized oil in an oil tank by introducing compressed air into the oil tank. 6. The hydraulic cushion device for a die mechanism according to claim 1, wherein the die mechanism is a forging device.