Cold forging hydraulic press for metal products

Abstract

The invention discloses a cold forging hydraulic machine for metal products. The cold forging hydraulic machine comprises a machine body, a female die mechanism and a male die mechanism. The female die mechanism is provided with a mounting plate, a positioning plate, a female die plate and reset pieces, the male die mechanism is provided with a cover plate, a male die plate and a pushing piece, the multiple reset pieces are arranged in the cold forging hydraulic machine used for the metal products, and positioning and elastic supporting of the female die plate can be completed by matching with a positioning rod at the lower end of the female die plate; large impact force caused to the female die plate when the cold forging hydraulic machine works is avoided, and certain buffering can be generated on the female die plate. And the demolding assembly is arranged in the convex mold plate, so that when the pushing piece moves upwards, the demolding assembly is driven to move upwards firstly, the demolding assembly drives the convex mold piece to move upwards, the formed workpiece is kept to be blocked by the unmoved convex mold plate, demolding is completed, the formed workpiece is prevented from moving along with the convex mold piece, and the machining efficiency is improved. Workers can conveniently and quickly take out the workpieces, the taking time is shortened, and accidents are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to cold forging technology, especially to a cold forging hydraulic press for metal products. BACKGROUND

[0002] Hydraulic press is often used in the field of cold forging to provide sufficient downward pressure. Hydraulic press is a device that applies pressure to liquid and pushes the liquid to transmit the pressure. It is widely used in various fields. Cold forging is a forming process below the recrystallization temperature of the material. In production, the forging of the blank without heating is called cold forging.

[0003] When a workpiece is cold forged, the cold forging die needs to be installed on the die installation device first, and the blank is placed above the cold forging die. Then the hydraulic press applies a huge downward pressure, so that the blank is extruded into the slot of the cold forging die and is formed by extrusion. When the existing cold forging hydraulic press quickly applies a huge downward pressure during die installation, the cold forging die will bear a large impact force. The traditional cold forging hydraulic press die installation mechanism has poor buffering effect, which may cause damage to the die. After the workpiece is formed, there is a certain probability that it will be attached to the punch, which makes it difficult to remove the formed workpiece, causing accidents and posing a great safety hazard. SUMMARY

[0004] In order to solve the defects of the prior art, the present application provides a cold forging hydraulic press for metal products.

[0005] A cold forging hydraulic press for metal products comprises:

[0006] A machine body is provided with a workbench and a hydraulic cylinder.

[0007] A concave die mechanism is arranged on the workbench. The concave die mechanism comprises an installation plate, a positioning plate, a concave die plate and a reset piece. The installation plate is arranged on the workbench. The positioning plate is arranged on the installation plate. The concave die plate is arranged on the positioning plate through the reset piece. The reset piece can push the concave die plate upward after being compressed by external force. The bottom of the concave die plate is provided with a pressure hole. The pressure hole is provided with a positioning rod inserted in the middle of the reset piece. The positioning plate is provided with a positioning hole matched with the positioning rod.

[0008] And the male die mechanism connected with the lower end of the hydraulic cylinder, the male die mechanism is equipped with a cover plate, a male die plate and a pusher connected with the hydraulic cylinder, the pusher is arranged in the middle of the male die plate, the cover plate limits the pusher in the middle of the male die plate, the male die plate is equipped with a plurality of movable holes, the movable hole is equipped with a sliding hole, the movable hole is equipped with a male die, the male die extends to the lower end through the sliding hole, the middle of the pusher is equipped with a demolding assembly matched with the male die, the demolding assembly is driven by the pusher moving up and down, and the male die in the movable hole is moved in the sliding hole under the driving of the demolding assembly;

[0009] The demolding assembly is equipped with a gear and a rotating piece, the middle of the pusher is equipped with a push rod matched with the rotating piece, the gear and the rotating piece are meshed and connected, the gear and the rotating piece are hinged at the lower end of the cover plate, and the male die is equipped with a rack block matched with the gear.

[0010] In the application, the reset member is sequentially composed of a spiral section, a bending part, a stretching part, a connecting section and a limiting part from top to bottom, the spiral section is arranged in the pressing hole, an installation area is formed between the spiral section and the limiting part, and the positioning plate is arranged in the installation area.

[0011] In the application, the limiting part is composed of a first horizontal section, a first curved section, a second curved section, a third curved section, a second horizontal section, a first vertical section, a first limiting section, a third horizontal section and a second limiting section, the end of the second limiting section is located in the middle of the second curved section, and a limiting area is formed between the first limiting section and the second limiting section.

[0012] In the application, the lower end of the positioning plate is equipped with a positioning block, the limiting block is symmetrically arranged around the positioning hole on the positioning block, a limiting space is formed between the limiting blocks, and the first limiting section and the second limiting section are located in the limiting space.

[0013] In the application, the positioning rod is composed of a first rod body, a second rod body and a support body, the first rod body is arranged in the pressing hole, the diameter of the first rod body is greater than that of the second rod body, the first rod body is arranged in the middle of the spiral section, the second rod body is located in the limiting area between the first limiting section and the second limiting section, and the support body is equipped with a support surface and a guide inclined surface.

[0014] In the application, the diameter of the first rod body is H1, the diameter of the second rod body is H2, the width of the limiting area is H3, and the diameter of the support body is H4, H1>H4>H3=H2.

[0015] In this invention, the pusher is provided with a drive rod connected to a hydraulic cylinder, the drive rod is provided with symmetrically arranged T-shaped portions, the two ends of the T-shaped portions are provided with pressure rings, the pressure rings are disposed in the movable holes, the middle of the pressure rings forms a receiving area, the demolding assembly is located in the receiving area, and the pusher is installed in the receiving area.

[0016] In this invention, the punch is composed of a limiting plate and a pressure body. The limiting plate is located in the movable hole, the pressure body is located in the sliding hole, and a clearance area for accommodating the demolding component is formed in the middle of the punch. The rack block is disposed on the limiting plate and located on both sides of the clearance area.

[0017] In this invention, the gear component is provided with a rotating rod, a first gear component, and a second gear component symmetrically arranged on both sides of the first gear component. The rotating component is provided with a first pushing arm, a second pushing arm, and a rotating arm. The first pushing arm is also provided with a guide arm. A moving area is formed between the guide arm and the second pushing arm. The lower end of the rotating arm is provided with a first tooth portion that cooperates with the second gear component.

[0018] In this invention, the lower end of the cover plate is provided with a fixing plate, which is composed of a fixing body, a connecting body and a hinge body. The fixing body is connected to the cover plate, and the two sides of the connecting body form a clearance space. The connection between the connecting body and the hinge body is provided with symmetrically arranged blocking slopes. The hinge body is provided with a first hinge block that cooperates with the rotating component and a second hinge block that cooperates with the gear component. The rotating component is hinged to the first hinge block through a hinge rod.

[0019] The cold forging hydraulic press used in this invention for metal products has the following advantages: The press is equipped with multiple resetting components, which, together with the positioning rod at the lower end of the concave die, complete the positioning and elastic support of the concave die. This avoids the large impact force on the concave die during operation and provides a certain degree of buffering. Furthermore, a demolding assembly is installed inside the convex die. When the pushing component moves upward, it first moves the demolding assembly upward, causing the demolding assembly to move the convex die upward. This keeps the formed workpiece blocked by the stationary convex die, thus completing demolding. This prevents the formed workpiece from moving with the convex die, allowing workers to quickly remove the workpiece, shortening the handling time, and preventing accidents. Attached Figure Description

[0020] Figure 1 A schematic diagram of the cold forging hydraulic press used in the metal products of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the punch and die mechanism in the diagram;

[0022] Figure 3 is a top view of Figure 2 ;

[0023] Figure 4 is a sectional view along A-A in Figure 3 ;

[0024] Figure 5 is a sectional view along B-B in Figure 3 ;

[0025] Figure 6 is an exploded view of Figure 2 ;

[0026] Figure 7 is another directional structural schematic view of Figure 6 ;

[0027] Figure 8 is a positioning plate structural schematic view in Figure 6 ;

[0028] Figure 9 is a local enlarged view at E in Figure 8 ;

[0029] Figure 10 is a reset member structural schematic view in Figure 6 ;

[0030] Figure 11 is a front view of Figure 10 ;

[0031] Figure 12 is a top view of Figure 10 ;

[0032] Figure 13 is a reset member and positioning plate structural installation state schematic view in the present application;

[0033] Figure 14 is a recessed die plate structural schematic view in Figure 6 ;

[0034] Figure 15 is a positioning rod structural schematic view in Figure 14 ;

[0035] Figure 16 is a convex die plate structural schematic view in Figure 6 ;

[0036] Figure 17 is a convex die structural schematic view in Figure 6 ;

[0037] Figure 18 is a push member structural schematic view in Figure 6 ;

[0038] Figure 19 is a schematic view of the cover plate structure in Figure 6

[0039] Figure 20 is a partial enlarged view at F in Figure 19

[0040] Figure 21 is a schematic view of the demolding assembly structure in Figure 6

[0041] Figure 22 is a front view of Figure 21

[0042] Figure 23 is a partial enlarged view at C in Figure 4

[0043] Figure 24 is a partial enlarged view at D in Figure 5

[0044] In the figure: body 1, recess die mechanism 2, male die mechanism 3, workbench 4, hydraulic oil cylinder 5, clamping area 6, mounting plate 7, positioning plate 8, recess die plate 9, reset piece 10, pressure hole 11, positioning rod 12, positioning hole 13, positioning block 14, limiting block 15, limiting space 16, first limiting section 17, second limiting section 18, compression area 19, male die 20, chamber 21, retaining block 22, helical section 23, bending part 24, stretching part 25, connecting section 26, limiting part 27, mounting area 28, extension section 29, second vertical section 30, fourth curved section 31, fifth curved section 32, sixth curved section 33, first deformation section 34, second deformation section 35, stretching area 36, limiting area 37, support body 38, first horizontal section 39, first curved section 40, second curved section 41, third curved section 42, second horizontal section 43, first vertical section 44, third horizontal section 45, first rod body 46, second rod body 47, support surface 48, guide inclined surface 49, cover plate 50, male die plate 51, pusher 52, movable hole 53, sliding hole 54, demolding assembly 55, fixed plate 56, fixed body 57, connecting body 58, hinged body 59, avoidance space 60, blocking inclined surface 61, guide arm 62, blocking surface 63, second pusher arm 64, rotating piece 65, first hinged block 66, gear piece 67, second hinged block 68, hinged rod 69, rotating rod 70, limiting disc 71, pressure body 72, avoidance area 73, rack block 74, second toothed part 75, drive rod 76, drive hole 77, T-shaped part 78, T-shaped slot 79, moving hole 80, pressure ring 81, containing area 82, pusher rod 83, retaining hole 84, second gear piece 85, first pusher arm 86, rotating arm 87, moving area 88, first toothed part 89, first gear piece 90. DETAILED DESCRIPTION ​​​​​​

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0046] like Figures 1 to 24 As shown, the cold forging hydraulic press used in this invention for metal products includes a machine body 1, a die mechanism 2, and a punch mechanism 3. The machine body 1 is provided with a worktable 4 and a hydraulic cylinder 5. The die mechanism 2 is installed on the worktable 4 and is located at the lower end of the punch mechanism 3. The hydraulic cylinder 5 is installed on the machine body 1, and the punch mechanism 3 is installed at the lower end of the hydraulic cylinder 5, so that the punch mechanism 3 can move up and down with the hydraulic cylinder 5. A mold closing area 6 is formed between the punch mechanism 3 and the die mechanism 2. The distance of the hydraulic cylinder 5 moving down can be changed according to different requirements of the molded workpiece, thereby controlling the height of the mold closing area 6, which is convenient for molding different types of workpieces.

[0047] The machine body 1 also includes other components that constitute the cold forging hydraulic press. These other components can be made using existing technologies, so they will not be described in detail here.

[0048] Example 1

[0049] The die mechanism 2 is mounted on the worktable 4. The die mechanism 2 includes a mounting plate 7, a positioning plate 8, a die template 9, and a reset component 10. The mounting plate 7 is mounted on the worktable 4, the positioning plate 8 is mounted on the mounting plate 7, and the die template 9 is mounted on the positioning plate 8 via the reset component 10. When the reset component 10 is compressed by external force, it can push the die template 9 to reset upwards. The bottom of the die template 9 is provided with a pressure hole 11, and a positioning rod 12 is inserted into the middle of the reset component 10 within the pressure hole 11. The positioning plate 8 is provided with a positioning hole 13 that cooperates with the positioning rod 12.

[0050] Mounting plate 7 remains connected to worktable 4, ensuring stable installation of die mechanism 2.

[0051] The lower end of the positioning plate 8 is provided with a positioning block 14, and the positioning block 14 is provided with limiting blocks 15 symmetrically arranged around the positioning hole 13. A limiting space 16 is formed between the limiting blocks 15, and the first limiting segment 17 and the second limiting segment 18 are located within the limiting space 16. The mounting plate 7 is located between the positioning blocks 14 and the positioning blocks 14, and is used to limit the position of the positioning plate 8 on the mounting plate 7. The lower end surface of the positioning block 14 is lower than the upper end surface of the mounting plate 7, so that the positioning block 14 can limit the position of the mounting plate 7 and keep the lower end of the reset member 10 from being blocked by the mounting plate 7.

[0052] The compression area 19 is formed between the die plate 9 and the positioning plate 8, the upper end of the die plate 9 is provided with the cavity 21 matched with the male die 20, and the lower end of the die plate 9 is provided with the plurality of retaining blocks 22 between the positioning plate 8 and the die plate 9, so that the die plate 9 can first compress the helical section 23 on the return element 10 when moving downward, and then the retaining blocks 22 contact the positioning plate 8, thereby avoiding the transition compression of the return element 10. After the die plate 9 is forced to move, it is first buffered by the return element 10, and then continues to move downward, so that the retaining blocks 22 are placed on the positioning plate 8, the die plate 9 is supported by the positioning plate 8, the mounting plate 7 and the workbench 4, and the workpiece is conveniently formed under stress.

[0053] The return element 10 is sequentially composed of the helical section 23, the bending part 24, the stretching part 25, the connecting section 26 and the limiting part 27 from top to bottom, the helical section 23 is arranged in the pressing hole 11, and the mounting area 28 is formed between the helical section 23 and the limiting part 27.

[0054] The bending part 24 is composed of the extension section 29 and the second vertical section 30, so that the bending part 24 is matched with the surface of the positioning plate 8 through the extension section 29 and the second vertical section 30.

[0055] The stretching part 25 is composed of the fourth bending section 31, the fifth bending section 32 and the sixth bending section 33, one end of the fourth bending section 31 is connected with the second vertical section 30, the other end is connected with one end of the fifth bending section 32 through the first deformation section 34, the other end of the fifth bending section 32 is connected with one end of the sixth bending section 33 through the second deformation section 35, and the other end of the sixth bending section 33 is connected with the connecting section 26. The first deformation section 34 and the second deformation section 35 form the stretching area 36, so that the connecting section 26 is subjected to downward tension, the stretching area 36 between the first deformation section 34 and the second deformation section 35 is forced to expand, thereby facilitating the downward movement of the limiting part 27, so that the first limiting section 17 and the second limiting section 18 are separated from the limiting space 16 and are no longer limited by the limiting block 15, the width of the limiting area 37 can be increased, the supporting body 38 can pass through the limiting area 37, so that the positioning rod 12 can move out of the limiting area 37, and the die plate 9 can be removed from the upper end of the positioning plate 8.

[0056] The limiting part 27 is provided with the first horizontal section 39, the first bending section 40, the second bending section 41, the third bending section 42, the second horizontal section 43, the first vertical section 44, the first limiting section 17, the third horizontal section 45 and the second limiting section 18, the end of the second limiting section 18 is located in the middle of the second bending section 41, and the first limiting section 17 and the second limiting section 18 form the limiting area 37.

[0057] The positioning rod 12 is composed of a first rod body 46, a second rod body 47 and a support body 38, the first rod body 46 is arranged in the pressing hole 11, the diameter of the first rod body 46 is larger than that of the second rod body 47, the first rod body 46 is arranged in the middle of the spiral section 23, the second rod body 47 is arranged in the limiting area 37 between the first limiting section 17 and the second limiting section 18, the support body 38 is provided with a support surface 48 and a guide inclined surface 49, the support surface 48 is used for supporting the first limiting section 17 and the second limiting section 18.

[0058] The diameter of the first rod body 46 is H1, the diameter of the second rod body 47 is H2, the width of the limiting area 37 is H3, and the diameter of the support body 38 is H4, H1>H4>H3=H2. So that the second rod body 47 can move up and down freely in the limiting area 37, so that the concave die plate 9 can not be blocked when it is pressed under force. When the concave die plate 9 is moved up and reset by the spiral section 23, the concave die plate 9 can be reset by the elastic force of the spiral section 23. Because the diameter of the support body 38 is larger than the width of the limiting area 37, and the first limiting section 17 and the second limiting section 18 are limited in position by the symmetrically arranged limiting blocks 15, the width of the limiting area 37 cannot be expanded, so the support body 38 cannot pass through the limiting area 37, so that the spiral section 23 is in a slightly compressed state, limiting the position of the concave die plate 9.

[0059] Embodiment 2

[0060] The male die mechanism 3 is connected with the lower end of the hydraulic cylinder 5, and the male die mechanism 3 is provided with a cover plate 50, a male die plate 51 and a pushing piece 52 connected with the hydraulic cylinder 5. The pushing piece 52 is arranged in the middle of the male die plate 51, and the cover plate 50 limits the pushing piece 52 in the middle of the male die plate 51. A plurality of movable holes 53 are arranged on the male die plate 51, a sliding hole 54 is arranged in each movable hole 53, a male die 20 is arranged in each movable hole 53, and the male die 20 extends to the lower end through the sliding hole 54. A demolding assembly 55 matched with the male die 20 is arranged in the middle of the pushing piece 52, the demolding assembly 55 is driven by the pushing piece 52 moving up and down, and the demolding assembly 55 drives the male die 20 in the movable hole 53 to move in the sliding hole 54.

[0061] The lower end of the cover plate 50 is provided with a fixed plate 56, the fixed plate 56 is composed of a fixed body 57, a connecting body 58 and a hinged body 59, the fixed body 57 is connected with the cover plate 50, both sides of the connecting body 58 form an avoiding space 60, a symmetrically arranged blocking inclined surface 61 is arranged at the connection between the connecting body 58 and the hinged body 59, the connecting body 58 is used for blocking a guide arm 62, so that the guide arm 62 cannot rotate excessively. A blocking surface 63 is arranged on the hinged body 59, the blocking surface 63 is arranged on both sides of the hinged body 59, and is used for limiting the rotation angle of a second pushing arm 64.

[0062] The hinge body 59 is provided with a first hinge block 66 matched with the rotating member 65 and a second hinge block 68 matched with the gear member 67, the rotating member 65 is hinged on the first hinge block 66 through a hinge rod 69, and the gear member 67 is installed on the second hinge block 68 through a rotating rod 70.

[0063] The male die 20 is composed of a limiting disc 71 in the movable hole 53 and a pressing body 72 in the sliding hole 54, a avoiding area 73 for accommodating the stripping assembly 55 is formed in the middle of the male die 20, and a rack block 74 is arranged on the limiting disc 71 and located on both sides of the avoiding area 73. The rack block 74 is provided with a second tooth part 75 matched with the second gear member 85, and when the second gear member 85 on the gear member 67 rotates, the second gear member 85 can drive the rack block 74 to move up and down, thereby driving the male die 20 to move up and down in the movable hole 53.

[0064] The pushing member 52 is provided with a driving rod 76 connected with the hydraulic oil cylinder 5, the cover plate 50 is provided with a driving hole 77 matched with the driving rod 76 in the middle, the driving rod 76 is provided with symmetrically arranged T-shaped parts 78, the male die plate 51 is provided with a T-shaped slot 79 matched with the T-shaped parts 78 and a moving hole 80 matched with the driving rod 76. The two ends of the T-shaped parts 78 are provided with pressing rings 81 arranged in the movable hole 53, a containing area 82 is formed in the middle of the pressing ring 81, the stripping assembly 55 is located in the containing area 82, a pushing rod 83 is installed in the containing area 82, and the pressing ring 81 is provided with retaining holes 84 matched with the pushing rod 83.

[0065] The stripping assembly 55 is provided with the gear member 67 and the rotating member 65, the middle of the pushing member 52 is provided with a pushing rod 83 matched with the rotating member 65, the gear member 67 and the rotating member 65 are in meshing connection, the gear member 67 and the rotating member 65 are hinged at the lower end of the cover plate 50, and the male die 20 is provided with a rack block 74 matched with the gear member 67.

[0066] The gear member 67 is provided with a rotating rod 70, a first gear member 90 and symmetrically arranged second gear members 85 on both sides of the first gear member 90. The rotating member 65 is provided with a first pushing arm 86, a second pushing arm 64 and a rotating arm 87, the first pushing arm 86 is further provided with a guide arm 62, a moving area 88 is formed between the guide arm 62 and the second pushing arm 64, and the lower end of the rotating arm 87 is provided with a first tooth part 89 matched with the second gear member 85. The first gear member 90 is arranged between the two symmetrically arranged rotating arms 87, and the hinge rod 69 is separately hinged to link one of the rotating arms 87 with the first hinge block 66, thereby avoiding the impact of the rack block 74 on the hinge rod 69.

[0067] As Figure 23As shown, at this time, the retaining punch 20 is kept in the cavity 21 of the die plate 9, and the retaining punch 20 completes the forming work on the workpiece. When the punch mechanism 3 needs to be lifted, the driving rod 76 can drive the pressing ring 81 to move upward, so that the pushing piece 52 moves in the moving hole 80, the T-shaped slot 79 and the movable hole 53. The height of the movable hole 53 is greater than that of the pressing ring 81, and the height of the T-shaped slot 79 is greater than that of the T-shaped part 78, so that when the pushing piece 52 is driven upward by the driving rod 76, the pushing piece 52 can first move upward, and the punch plate 51 and the cover plate 50 remain in position under the influence of gravity. The pushing rod 83 in the middle of the pressing ring 81 can first move upward in the moving area 88, and the first pushing arm 86 is pushed by the pushing rod 83, and then reaches the guide arm 62, so that the guide arm 62 is pushed by the pushing rod 83, and then the rotating piece 65 rotates around the hinge rod 69, so that the second gear piece 85 at the lower end of the rotating arm 87 drives the gear piece 67 to rotate, and the first gear piece 90 on the gear piece 67 drives the rack block 74 on the punch 20 to move upward by a small distance, so that the workpiece is blocked by the punch plate 51, and thus falls. Since the pressing ring 81 has moved upward, the punch 20 can be driven by the first gear piece 90 to move the rack block 74 upward by a distance, and will not be blocked by the pressing ring 81.

[0068] When the pushing rod 83 is driven downward by the pushing piece 52, the second pushing arm 64 is driven by the pushing rod 83, so that the rotating piece 65 rotates around the hinge rod 69, so that the rotating arm 87 drives the gear piece 67 to rotate, and the gear piece 67 drives the punch 20 to move downward, and finally the pressing ring 81 applies pressure to the punch 20 to press the workpiece.

[0069] In the present application, only the punch 20 needs to move into the movable hole 53 by a small distance, so that the formed workpiece is blocked by the punch plate 51 and separated from the punch 20, so that the formed workpiece is no longer attached to the punch 20 by force. When attached, the raw material may be extruded by the punch 20, and after forming, the air inside the workpiece is discharged, so that the internal pressure of the workpiece is smaller, and thus the workpiece is attached to the punch 20. It may also be because the inner diameter of the workpiece is slightly smaller than the outer diameter of the punch 20 after extrusion, so that the workpiece is attached to the punch 20. Only the punch 20 needs to be forced to move outward by a small distance, so that the workpiece falls from the punch 20, so that the worker can pick it up, and does not need to manually pull it out of the punch 20, which is convenient for the worker to pick up and saves time, so as to avoid accidents caused by time delay when pulling out.

[0070] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall fall in the protection scope of the present application.

Claims

1. A cold forging hydraulic press for metal products, characterized in that, include: The machine body is equipped with a worktable and a hydraulic cylinder. A die mechanism is provided on a worktable. The die mechanism includes a mounting plate, a positioning plate, a die template, and a reset component. The mounting plate is provided on the worktable, the positioning plate is provided on the mounting plate, and the die template is provided on the positioning plate via the reset component. When the reset component is compressed by an external force, it can push the die template upward to reset. The bottom of the die template is provided with a pressure hole, and a positioning rod inserted into the middle of the reset component is provided in the pressure hole. The positioning plate is provided with a positioning hole that cooperates with the positioning rod. The device includes a punch mechanism connected to the lower end of a hydraulic cylinder. The punch mechanism includes a cover plate, a punch template, and a pusher connected to the hydraulic cylinder. The pusher is located in the middle of the punch template. The cover plate restricts the pusher in the middle of the punch template. The punch template has multiple movable holes. Each movable hole has a sliding hole. A punch is located in each movable hole. The punch extends through the sliding hole to the lower end. A demolding assembly that cooperates with the punch is located in the middle of the pusher. The demolding assembly is driven by the up-and-down moving pusher to keep the demolding assembly moving the punch in the movable hole within the sliding hole. The demolding assembly includes a gear component and a rotating component. The middle of the pushing component has a pushing rod that cooperates with the rotating component. The gear component and the rotating component are meshed and connected. The gear component and the rotating component are hinged to the lower end of the cover plate. The punch component has a rack block that cooperates with the gear component.

2. The cold forging hydraulic press for metal products according to claim 1, characterized in that, The reset component consists of a spiral segment, a bending part, a stretching part, a connecting segment, and a limiting part from top to bottom. The spiral segment is disposed in the pressure hole, and an installation area is formed between the spiral segment and the limiting part. The positioning plate is disposed in the installation area.

3. The cold forging hydraulic press for metal products according to claim 2, characterized in that, The limiting part is composed of a first transverse section, a first curved section, a second curved section, a third curved section, a second transverse section, a first vertical section, a first limiting section, a third transverse section, and a second limiting section. The end of the second limiting section is located in the middle of the second curved section, and a limiting area is formed between the first limiting section and the second limiting section.

4. The cold forging hydraulic press for metal products according to claim 3, characterized in that, The lower end of the positioning plate is provided with a positioning block, and the positioning block is provided with limiting blocks symmetrically arranged around the positioning hole. The limiting blocks form a limiting space between the limiting blocks, and the first limiting segment and the second limiting segment are located within the limiting space.

5. The cold forging hydraulic press for metal products according to claim 4, characterized in that, The positioning rod consists of a first rod body, a second rod body, and a support body. The first rod body is disposed in the pressure hole, and the diameter of the first rod body is larger than the diameter of the second rod body. The first rod body is disposed in the middle of the spiral section, and the second rod body is located in the limiting area between the first limiting section and the second limiting section. The support body is provided with a support surface and a guide slope.

6. The cold forging hydraulic press for metal products according to claim 5, characterized in that, The diameter of the first rod is H1, the diameter of the second rod is H2, the width of the limiting area is H3, and the diameter of the support is H4, where H1 > H4 > H3 = H2.

7. The cold forging hydraulic press for metal products according to claim 1, characterized in that, The pusher is provided with a drive rod connected to a hydraulic cylinder. The drive rod is provided with symmetrically arranged T-shaped parts. The two ends of the T-shaped parts are provided with pressure rings. The pressure rings are arranged in the movable holes. The middle of the pressure rings forms a receiving area. The demolding assembly is located in the receiving area. The pusher is installed in the receiving area.

8. The cold forging hydraulic press for metal products according to claim 7, characterized in that, The punch is composed of a limiting plate and a pressure body. The limiting plate is located in the movable hole, and the pressure body is located in the sliding hole. A clearance area for accommodating the demolding component is formed in the middle of the punch. The rack block is disposed on the limiting plate and located on both sides of the clearance area.

9. The cold forging hydraulic press for metal products according to claim 8, characterized in that, The gear component is provided with a rotating rod, a first gear component, and a second gear component symmetrically arranged on both sides of the first gear component. The rotating component is provided with a first push arm, a second push arm, and a rotating arm. The first push arm is also provided with a guide arm. A moving area is formed between the guide arm and the second push arm. The lower end of the rotating arm is provided with a first tooth portion that cooperates with the second gear component.

10. The cold forging hydraulic press for metal products according to claim 9, characterized in that, The lower end of the cover plate is provided with a fixing plate, which is composed of a fixing body, a connecting body and a hinge body. The fixing body is connected to the cover plate. The two sides of the connecting body form a clearance space. The connection between the connecting body and the hinge body is provided with symmetrically arranged blocking slopes. The hinge body is provided with a first hinge block that cooperates with the rotating part and a second hinge block that cooperates with the gear part. The rotating part is hinged to the first hinge block through a hinge rod.

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