Spring delay reset mechanism

Abstract

The utility model discloses a spring delay reset mechanism which comprises a limiting stop block and a stop block driving device, and the limiting stop block can be installed on a lower die of a stamping die in a reciprocating motion mode on the horizontal plane. After the stamping die is closed, the stop dog driving device can drive the limiting stop dog to be inserted into the stamping die in a forward sliding mode and stop the limiting stop dog on the upper side surface of the lower die stripping plate, so that the lower die stripping plate of the stamping die cannot move upwards under the action of the lower die stripping spring; the stop block driving device can drive the limiting stop block to slide reversely to exit from the stamping die and break away from blocking on the upper side surface of the lower die stripping plate after the upper die rises to the designated height, so that the lower die stripping plate of the stamping die moves upwards under the action of the lower die stripping spring to conduct stripping. According to the utility model, the delayed reset of a common spring is realized in the stamping die, the adoption of an expensive delayed reset spring is avoided, the manufacturing cost of the die is reduced, and the manufacturing period of the die is shortened.

Description

Technical Field

[0001] The utility model relates to a stamping die, in particular to a spring time-delay reset mechanism. Background Art

[0002] Springs are commonly used elastic retaining and return components in molds. During the press-stretch forming process, both the inner and outer retaining plates simultaneously compress the material to produce qualified parts. During the mold opening process, if ordinary springs are used, the inner and outer retaining plates will exert counterpressure on the part. If the part is not strong enough, it will deform and produce an unqualified part. In this case, the inner or outer retaining plate needs to be replaced with a delayed return spring to produce qualified parts. The commonly used delayed return springs on the market are complex in structure, expensive, have long procurement cycles, and have a short service life. Utility Model Content

[0003] In order to overcome the above-mentioned defects, the utility model provides a spring delayed reset mechanism, which can delay the reset of an ordinary spring in a stamping die, thereby reducing the die manufacturing cost and shortening the die manufacturing cycle.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a spring delayed reset mechanism, including a limit block and a block driving device, the limit block being installed on the lower die of the stamping die and capable of reciprocating in a horizontal plane, the block driving device being able to drive the limit block to slide forward and insert into the interior of the stamping die and stop on the upper surface of the lower die stripping plate after the stamping die is closed, so that the lower die stripping plate of the stamping die cannot move upward under the action of the lower die stripping spring, and when the stamping die is opened, the block driving device being able to drive the limit block to slide in the opposite direction and exit the stamping die and disengage from the obstruction of the upper surface of the lower die stripping plate after the upper die rises to a specified height, so that the lower die stripping plate of the stamping die moves upward under the action of the lower die stripping spring to strip the material.

[0005] As a further improvement of the present invention, at least two of the limit blocks are symmetrically arranged on opposite side walls of the lower mold, and at least two block driving devices respectively drive the limit blocks to move synchronously.

[0006] As a further improvement of the present invention, the block driving device includes a pull rod, the upper end of the pull rod is fixedly mounted on the upper mold, and the lower end of the pull rod is connected to the limit block so as to be able to move relative to each other in the up and down directions. The pull rod moves up and down synchronously with the upper mold and can drive the limit block to move on the horizontal plane through the contact surface extending in the vertical direction and the inclined direction.

[0007] As a further improvement of the present invention, the size of the lower die stripping plate of the stamping die is smaller than the lower die plate, and the limit stop block is installed on the lower die plate of the stamping die and can slide back and forth in a straight line on the horizontal plane, extending to the lower side surface of the outer part of the lower die stripping plate. The limit stop block extends out of the outer part of the lower die plate of the stamping die and is provided with a hollow structure running through it up and down. The pull rod can be slidably inserted into the hollow structure of the limit stop block, and the hollow structure of the limit stop block is a first inclined surface away from the side wall of the lower die stripping plate. The first inclined surface makes the lower end opening size of the hollow structure larger than the upper end opening size, and the lower end of the pull rod is formed with a second inclined surface matching the first inclined surface on the side wall facing away from the lower die stripping plate. The second inclined surface at the lower end of the pull rod is lower than the set distance of the first inclined surface when the stamping die is in the mold closing state. The block driving device also includes a limit spring, which is installed on the lower die, and the limit spring provides the limit stop block with an elastic retaining force that slides forward to prevent the small stripping plate from moving upward.

[0008] As a further improvement of the present invention, a positioning seat is fixedly installed on the lower side surface of the outer part of the lower mold stripping plate extending out of the lower mold, and a horizontally extending slide is provided in the positioning seat, and the limit block can be slidably inserted in the slide, and the side wall of the slide is also provided with a long strip limiting groove parallel to the slide, and the side wall of the limit block is provided with a protruding guide block, and the guide block can be slidably inserted in the long strip limiting groove, and the limit spring is also provided in the long strip limiting groove, one end of the limit spring is tightly against the surface of the side of the long strip limiting groove away from the lower mold stripping plate, and the other end of the limit spring is tightly against the surface of the guide block.

[0009] As a further improvement of the present invention, the limit stop forms a third inclined surface on the lower side surface of one end of the lower mold stripper plate, and the edge of the lower mold stripper plate and the position facing the limit stop form a fourth inclined surface, and the third inclined surface and the fourth inclined surface are parallel chamfered surfaces.

[0010] As a further improvement of the present invention, the pull rod includes a vertically extending pull rod body and a "boot"-shaped pull rod driving block. The pull rod driving block is fixedly installed on the lower end of the pull rod body through a connecting piece. The upper end of the pull rod driving block is a vertically extending rod-shaped structure aligned and connected with the pull rod body. A right-angled triangle-shaped protrusion is formed on the side wall of the lower end of the pull rod driving block, and the inclined surface of the protrusion forms the second inclined surface of the pull rod.

[0011] As a further improvement of the present invention, a guide member is fixedly provided on the lower template, and a guide groove extending in the vertical direction is provided on the guide member. A roller is provided on the bottom surface of the guide groove. The pull rod can be inserted into the majority of the guide grooves and can slide up and down, and the roller can roll along the side wall of the pull rod.

[0012] As a further improvement of the present invention, a pull rod fixing seat is fixedly installed on the side wall of the upper template of the upper mold, and the upper end of the pull rod is fixedly installed on the pull rod fixing seat by connecting screws.

[0013] As a further improvement of the present invention, the lower die stripping spring is a compression spring, and the lower die of the stamping die also includes a lower pad, a stripping ejector rod and an outer pressure plate. The lower pad is fixedly arranged at parallel intervals under the lower template, and the lower die stripping plate can be installed between the lower template and the lower pad so as to move up and down. The upper and lower ends of the stripping spring are respectively inserted into the spring grooves on the lower side of the lower die stripping plate and the upper side of the lower plate. A number of stripping ejector rods are fixedly installed on the lower stripping plate, and the lower template is provided with a avoidance hole for the stripping ejector rod to slide through. The upper end of the stripping ejector rod passes through the avoidance hole of the lower template and is fixedly connected to the outer pressure plate on the upper side of the upper template. The lower end of the upper die is provided with an inner pressure plate, which presses the upper side of the sheet metal, and the outer pressure plate can press the bending surface of the lower side of the sheet metal.

[0014] The beneficial effect of the utility model is that the utility model installs a limit stopper for horizontal movement on the stamping die. When the stamping die is closed, the limit stopper is inserted between the lower template and the lower die stripping plate. When the die is just opened, the lower die stripping plate is blocked by the limit stopper and cannot move upward. The lower die stripping spring remains in a compressed state. When the upper die rises to the designed height, the inner pressure plate of the upper die is completely separated from the pressing state on the upper side of the product. The limit stopper retreats and disengages from the obstruction of the lower die stripping plate under the action of the stopper driving device, so that the lower die stripping plate can move upward. At this time, the lower die stripping spring resets and drives the lower die stripping plate upward, thereby driving the lower die stripping plate upward. The outer pressure plate above the movable lower template lifts the product upward to remove the material. At this time, since the product is only subjected to upward support force in one direction, it will not be deformed and can be removed smoothly, ensuring product accuracy. The block driving device of this applicable model adopts a pull rod installed on the upper mold, which drives the limit baffle to move horizontally through the inclined surface, realizing the linkage between the limit baffle and the upper mold, further ensuring product accuracy while saving energy. The utility model realizes the delayed reset of ordinary springs in the stamping mold, avoids the use of expensive delayed reset springs, reduces the mold manufacturing cost and shortens the mold manufacturing cycle, and enhances the competitiveness of enterprises in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the main view of the utility model;

[0016] Figure 2 It is a top view of the utility model;

[0017] Figure 3 for Figure 2 Middle AA section view;

[0018] Figure 4 for Figure 2Middle BB section view. DETAILED DESCRIPTION

[0019] Embodiment: A spring delayed reset mechanism comprises a limit block 1 and a block driving device, wherein the limit block 1 is installed on the lower die of the stamping die and can move back and forth in a horizontal plane, and the block driving device can drive the limit block 1 to slide forward and insert into the interior of the stamping die and stop on the upper surface of the lower die stripper plate 2 after the stamping die is closed, so that the lower die stripper plate 2 of the stamping die cannot move upward under the action of the lower die stripper spring 3. When the stamping die is opened, the block driving device can drive the limit block 1 to slide in the opposite direction to exit the stamping die and disengage from the obstruction of the upper surface of the lower die stripper plate 2 after the upper die 24 rises to a specified height, so that the lower die stripper plate 2 of the stamping die moves upward under the action of the lower die stripper spring 3 to strip the material.

[0020] When the mold is closed, the lower mold stripper plate 2 moves downward under the pressure of the upper mold 24 to compress the lower mold stripper spring 3. The limit block 1 is driven by the block driving device to be inserted into the lower mold of the stamping mold. The limit block 1 presses on the upper side of the lower mold stripper plate 2. The lower mold stripper plate 2 is pressed and cannot move upward. The lower mold stripper spring 3 remains in a compressed state.

[0021] When the mold is opened, after the upper mold 24 moves upward for a distance, the upper mold 24 is completely separated from the product, and the limit block 1 moves in the opposite direction under the drive of the block driving device to separate from the lower mold stripper plate 2. After the lower mold stripper plate 2 loses the obstruction of the limit block 1, the lower mold stripper spring 3 extends and resets. Under the action of the lower mold stripper spring 3, the lower mold stripper plate 2 moves upward, thereby realizing the demoulding of the product and the lower mold;

[0022] The above-mentioned mechanism realizes the delayed reset of the lower die stripping spring 3 of the stamping die, that is, it realizes the delayed upward movement of the lower die stripping plate 2, so that the product is completely separated from the upper die 24 and then stripped from the lower die, avoiding that when the stamping die is opened, the product is simultaneously subjected to the bidirectional pressure of the upper die 24 stripping and the lower die stripping mechanism, thereby avoiding the deformation of the product caused by inconsistent bidirectional pressure. This mechanism allows ordinary springs to be delayed in reset when the stamping die is opened, achieving the effect of a special delayed reset spring, ensuring the dimensional accuracy of the product stamping, reducing the manufacturing cost of the stamping die, shortening the stamping die manufacturing cycle, and ensuring product quality.

[0023] At least two of the limit stops 1 are symmetrically arranged on opposite side walls of the lower die, and at least two stopper driving devices respectively drive the limit stops 1 to move synchronously. The limit stops 1 are preferably symmetrically arranged on two opposite sides of the stamping die to achieve synchronous blocking of the lower die stripper plate 2, ensuring that the lower die pressing plate always remains horizontal and preventing the lower die pressing plate from tilting. This ensures that the lower die stripper plate 2 can smoothly move upward to remove the material after the limit stops 1 are withdrawn, and also avoids damage to the lower die stripper spring 3.

[0024] The stopper drive device includes a tie rod 4, the upper end of which is fixedly mounted on the upper die 24. The lower end of the tie rod 4 is connected to the limit stopper 1 for vertical relative movement. The tie rod 4 moves up and down synchronously with the upper die 24, driving the limit stopper 1 in horizontal motion via a contact surface extending in both vertical and oblique directions. The lower end of the tie rod 4 is connected to the limit stopper 1, driving the limit stopper 1 in horizontal motion. This achieves linkage between the limit stopper 1 and the upper die 24, ensuring accurate movement timing of the limit stopper 1 and effectively preventing compression deformation on the upper and lower sides of the product.

[0025] The size of the lower die stripper plate 2 of the stamping die is smaller than the lower die plate 23. The limit stopper 1 is installed on the lower die plate 23 of the stamping die and can slide back and forth linearly on the horizontal plane. It extends to the lower side of the outer part of the lower die stripper plate 2. The limit stopper 1 extends out of the outer part of the lower die plate 23 of the stamping die and is provided with a hollow structure 5 that passes through the upper and lower parts. The pull rod 4 can be slidably inserted into the hollow structure 5 of the limit stopper 1. The side wall of the hollow structure 5 of the limit stopper 1 away from the lower die stripper plate 2 is a first inclined surface 6. The first bevel 6 makes the opening size of the lower end of the hollow structure 5 larger than the opening size of the upper end. A second bevel 7 matching the first bevel 6 is formed on the side wall of the lower end of the pull rod 4 facing away from the lower mold stripper plate 2. The second bevel 7 at the lower end of the pull rod 4 is lower than the set distance of the first bevel 6 when the stamping mold is in the mold closing state. The block driving device also includes a limit spring 8, which is installed on the lower mold. The limit spring 8 provides the limit block 1 with an elastic retaining force to slide forward to prevent the small stripper plate from moving upward.

[0026] The pull rod 4 is inserted into the hollow structure 5 of the limit block 1. When the mold is closed, the pull rod 4 moves downward a certain distance with the upper mold 24. The second inclined surface 7 at the lower end of the pull rod 4 is located below the limit block 1, and there is a certain height difference between the second inclined surface 7 and the first inclined surface 6. At this time, the limit block 1 is inserted into the stamping mold under the action of the limit spring 8 and is tightly attached to the upper side of the lower mold stripper plate 2; when the mold is opened, the upper mold 24 starts to ascend, and the pull rod 4 also starts to move upward. Before the upper mold 24 is completely separated from the product, the second inclined surface 7 of the pull rod 4 does not enter the hollow structure 5 of the limit block 1 and does not contact the first inclined surface 6. Therefore, the limit block 1 remains stationary, the lower mold stripper plate 2 is also pressed and does not move, and the lower mold stripper spring 3 also remains in a compressed state. After the upper die 24 is completely separated from the product, the upper die 24 continues to move upward, and the pull rod 4 continues to move upward. At this time, the second inclined surface 7 at the lower end of the pull rod 4 enters the hollow structure 5 of the limit stop 1 and is tightly attached to the first inclined surface 6. As the pull rod 4 continues to move upward, the first inclined surface 6 of the limit stop 1 is subjected to the force of the second inclined surface 7 at the lower end of the pull rod 4 and retreats horizontally, thereby causing the limit stop 1 to gradually withdraw from the stamping die and break away from the obstruction of the lower die stripper plate 2. After the lower die stripper plate 2 loses the obstruction of the limit stop 1, the lower die stripper spring 3 begins to extend and reset, and the lower die stripper plate 2 moves upward to realize the stripping of the product from the lower die. The above structure realizes the linkage between the limit stop 1 and the upper die 24, which has a simple structure, smooth operation, and is not prone to malfunction.

[0027] In addition, the pull rod 4 can also drive the limit block 1 to move horizontally as required through other structures, such as providing a guide slide groove composed of a vertically extending lower slide groove and an obliquely extended upper slide groove on the side wall of the limit block 1, and providing a sliding pin on the pull rod 4. The sliding pin on the pull rod 4 slides in the guide slide groove of the limit slider, and the limit block 1 can also be inserted into the stamping die to block the lower stripper plate when the die is closed, and the lower die of the stamping die can be delayed to withdraw when the die is opened, so as to realize the delayed reset of the lower die stripper plate 2 and the lower die stripper spring 3. This is an equivalent replacement structure that can be easily thought of by technical personnel in this field based on this application, and it also falls within the scope of protection of this patent.

[0028] A positioning seat 9 is fixedly installed on the lower side surface of the lower template 23 extending out from the outer part of the lower mold stripper plate 2, and a horizontally extending slide is provided in the positioning seat 9, and the limit block 1 can be slidably inserted in the slide, and the side wall of the slide is also provided with a long strip limit groove 10 parallel to the slide, and a protruding guide block 11 is provided on the side wall of the limit block 1, and the guide block 11 can be slidably inserted in the long strip limit groove 10, and the limit spring 8 is also provided in the long strip limit groove 10, one end of the limit spring 8 is tightly against the surface of the side of the long strip limit groove 10 away from the lower mold stripper plate 2, and the other end of the limit spring 8 is tightly against the surface of the guide block 11. The sliding guidance of the limit block 1 is achieved through the horizontally extending slide on the positioning seat 9, ensuring that it enters the stamping die as required to block the lower die stripping plate 2 from moving upward, and exits the stamping die as required to break away from the obstruction of the lower die stripping plate 2. The guide block 11 on the limit block 1 slides in the long strip limit groove on the side wall of the slide to limit the sliding distance of the limit block 1, and can also be further guided. At the same time, the limit spring 8 applies elastic force to the limit block 1. Therefore, the long strip limit groove 10 can also be set on the limit block 1, and the guide block 11 is set on the positioning seat 9.

[0029] The stopper 1 has a third inclined surface 12 formed on the lower side of one end thereof facing the lower die stripper plate 2, and a fourth inclined surface 13 formed at the portion of the edge of the lower die stripper plate 2 that faces the stopper 1. The third inclined surface 12 and the fourth inclined surface 13 are parallel chamfered surfaces. The stopper 1 has the third inclined surface 12 aligned with the fourth inclined surface 13 on the edge of the lower die stripper plate 2, enabling the stopper 1 to be smoothly inserted above the lower die stripper plate 2, and preventing interference between the side walls of the two, which could prevent the stopper 1 from being inserted above the lower die stripper plate 2.

[0030] The tie rod 4 comprises a vertically extending tie rod body 14 and a "boot"-shaped tie rod drive block 15. The tie rod drive block 15 is fixedly mounted to the lower end of the tie rod body 14 via a connector. The upper end of the tie rod drive block 15 is a vertically extending rod-shaped structure aligned and engaged with the tie rod body 14. A right-angled triangle-shaped protrusion is formed on the side wall of the lower end of the tie rod drive block 15. The inclined surface of the protrusion forms the second inclined surface 7 of the tie rod 4. The tie rod 4 is designed as a split structure to facilitate assembly.

[0031] The lower template 23 is fixed with a guide member 16, which is provided with a guide groove extending in the vertical direction. The bottom surface of the guide groove is provided with a roller. The pull rod 4 is inserted into the guide groove so as to slide up and down, and the roller can roll along the side wall of the pull rod 4. This structure ensures that the pull rod 4 can move up and down in the vertical direction and prevents deformation of the pull rod 4 that may cause errors in its movement.

[0032] A pull rod fixing seat 17 is fixedly mounted on the side wall of the upper die 24 , and the upper end of the pull rod 4 is fixedly mounted on the pull rod fixing seat 17 via connecting screws.

[0033] The lower die stripping spring 3 is a compression spring. The lower die of the stamping die also includes a lower pad 18, a stripping ejector rod 19 and an outer pressure plate 20. The lower pad 18 is fixedly arranged at parallel intervals below the lower template 23. The lower die stripping plate 2 can be installed between the lower template 23 and the lower pad 18 for lifting and lowering movements. The upper and lower ends of the stripping spring are respectively inserted into the spring grooves on the lower side of the lower die stripping plate 2 and the upper side of the lower plate. A number of stripping ejector rods 19 are fixedly installed on the lower stripping plate. The lower template 23 is provided with a avoidance hole for the stripping ejector rod 19 to slide through. The upper end of the stripping ejector rod 19 passes through the avoidance hole of the lower template 23 and is fixedly connected to the outer pressure plate 20 on the upper side of the upper die 24. The lower end of the upper die 24 is provided with an inner pressure plate 21. The inner pressure plate 21 presses the upper side of the sheet metal 22, and the outer pressure plate 20 can press the lower bending surface of the sheet metal 22.

[0034] The outer pressing plate 20 of the lower mold moves downward and sticks to the lower mold plate 23 under the pressure of the inner pressing plate 21 of the upper mold 24, and the lower mold stripper plate 2 drops as the outer pressing block synchronously compresses the lower mold stripper spring 3. At this time, the inner pressing plate 21 of the upper mold 24 and the outer pressing plate 20 of the lower mold are respectively pressed into the upper and lower sides of the outer edge of the "J" shape product, and the limit block 1 is driven by the block driving device to be inserted into the gap between the lower mold plate 23 of the lower mold and the lower mold stripper plate 2, limiting The limit block 1 is pressed on the upper side of the lower die stripper plate 2. The lower die stripper plate 2 is under pressure and cannot move upward. The lower die stripper spring 3 remains in a compressed state. When the mold is opened, the upper die 24 moves up a distance. At this time, the molding cavity of the upper die 24 and the middle part of the product are completely separated under the action of the inner pressure plate 21. The inner pressure plate 21 also begins to separate from the pressure on the outer edge of the product. The product is only in close contact with the lower die. The limit block 1 moves in the opposite direction and separates from the lower die stripper plate under the drive of the block driving device. When the die is released from the upper mold 24, the upper mold 24 is pressed against the upper mold 24, and the upper mold 24 is pressed against the lower mold 24. When the die is released from the upper mold 24, the upper mold 24 is pressed against the lower mold 24, and the upper mold 24 is pressed against the lower mold 24. When the die is released from the upper mold 24, the upper mold 24 is pressed against the upper mold 24, and the upper mold 24 is pressed against the lower mold 24.

Claims

1. A spring delayed reset mechanism, characterized in that: The invention comprises a limit block (1) and a block driving device, wherein the limit block is installed on the lower die of the stamping die and can reciprocate on the horizontal plane. The block driving device can drive the limit block to slide forward and insert into the interior of the stamping die and stop on the upper surface of the lower die stripping plate (2) after the stamping die is closed, so that the lower die stripping plate of the stamping die cannot move upward under the action of the lower die stripping spring (3). When the stamping die is opened, the block driving device can drive the limit block to slide in the opposite direction to exit the stamping die and disengage from the obstruction of the upper surface of the lower die stripping plate after the upper die (24) rises to a specified height, so that the lower die stripping plate of the stamping die moves upward under the action of the lower die stripping spring to strip the material.

2. The spring delayed reset mechanism according to claim 1, characterized in that: At least two of the limit blocks are symmetrically arranged on opposite side walls of the lower mold, and at least two block driving devices respectively drive the limit blocks to move synchronously.

3. The spring delayed reset mechanism according to claim 1, characterized in that: The block driving device comprises a pull rod (4), the upper end of which is fixedly mounted on the upper die, and the lower end of which is connected to the limit block so as to be able to move relative to each other in the up and down directions. The pull rod moves up and down synchronously with the upper die and can drive the limit block to move on the horizontal plane through a contact surface extending in the vertical direction and the inclined direction.

4. The spring delayed reset mechanism according to claim 3, characterized in that: The size of the lower die stripping plate of the stamping die is smaller than the lower die plate (23), and the limit stop is installed on the lower die plate of the stamping die and can slide back and forth in a straight line on the horizontal plane, extending to the lower side surface of the outer part of the lower die stripping plate. The limit stop is extended from the outer part of the lower die plate of the stamping die and is provided with a hollow structure (5) passing through the upper and lower parts. The pull rod can be slidably inserted into the hollow structure of the limit stop. The hollow structure of the limit stop is a first inclined surface (6) on one side wall away from the lower die stripping plate. The first inclined surface makes the lower end opening size of the hollow structure larger than the upper end opening size. The lower end of the pull rod is formed with a second inclined surface (7) matching the first inclined surface on the side wall facing away from the lower die stripping plate. The second inclined surface of the lower end of the pull rod is lower than the set distance of the first inclined surface when the stamping die is in the mold closing state. The block driving device also includes a limit spring (8), which is installed on the lower die. The limit spring provides the limit stop with an elastic retaining force to prevent the small stripping plate from moving upward in the positive sliding direction.

5. The spring delayed reset mechanism according to claim 4, characterized in that: A positioning seat (9) is fixedly installed on the lower side surface of the outer part of the lower mold stripping plate, and a horizontally extending slide is provided in the positioning seat. The limit block can be slidably inserted in the slide. The side wall of the slide is also provided with a long strip limit groove (10) parallel to the slide. A convex guide block (11) is provided on the side wall of the limit block. The guide block can be slidably inserted in the long strip limit groove. The limit spring is also provided in the long strip limit groove. One end of the limit spring is tightly against the surface of the side of the long strip limit groove away from the lower mold stripping plate, and the other end of the limit spring is tightly against the surface of the guide block.

6. The spring delayed reset mechanism according to claim 3, characterized in that: The limit stop forms a third inclined surface (12) on the lower side of one end of the lower die stripper plate, and the edge of the lower die stripper plate and the position facing the limit stop form a fourth inclined surface (13), and the third inclined surface and the fourth inclined surface are parallel chamfered surfaces.

7. The spring delayed reset mechanism according to claim 3, characterized in that: The pull rod comprises a vertically extending pull rod body (14) and a "boot"-shaped pull rod driving block (15), wherein the pull rod driving block is fixedly mounted on the lower end of the pull rod body via a connecting piece, and the upper end of the pull rod driving block is a vertically extending rod-shaped structure aligned and connected with the pull rod body, and a right-angled triangle-shaped protrusion is formed on the side wall of the lower end of the pull rod driving block, and the inclined surface of the protrusion forms the second inclined surface of the pull rod.

8. The spring delayed reset mechanism according to claim 4, characterized in that: A guide member (16) is fixedly provided on the lower template, and a guide groove extending in a vertical direction is provided on the guide member. A roller is provided on the bottom surface of the guide groove. The pull rod can be inserted into the guide groove so as to slide up and down, and the roller can roll along the side wall of the pull rod.

9. The spring delayed reset mechanism according to claim 3, characterized in that: A pull rod fixing seat (17) is fixedly installed on the upper template side wall of the upper mold, and the upper end of the pull rod is fixedly installed on the pull rod fixing seat through a connecting screw.

10. The spring delayed reset mechanism according to claim 1, characterized in that: The lower die stripping spring is a compression spring. The lower die of the stamping die also includes a lower pad (18), a stripping ejector rod (19) and an outer pressure plate (20). The lower pad is fixedly arranged below the lower template in parallel and at intervals. The lower die stripping plate is installed between the lower template and the lower pad so as to be able to move up and down. The upper and lower ends of the stripping spring are respectively inserted into the spring grooves on the lower side of the lower die stripping plate and the upper side of the lower plate. Several stripping ejector rods are fixedly installed on the lower stripping plate. The lower template is provided with an avoidance hole for the stripping ejector rod to slide through. The upper end of the stripping ejector rod passes through the avoidance hole of the lower template and is fixedly connected to the outer pressure plate on the upper side of the upper template. The lower end of the upper die is provided with an inner pressure plate (21). The inner pressure plate presses the upper side of the sheet metal (22), and the outer pressure plate can press the lower bending surface of the sheet metal.

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