Release delaying mechanism for upper die pressing plate of material pressing die and material pressing die

Abstract

The invention relates to the technical field of pressing dies, and particularly discloses a delayed release mechanism for an upper die pressing plate of a pressing die and the pressing die. According to the delayed release mechanism, a transmission block is arranged on a lower die pressing plate and can move in the longitudinal direction, the lower die pressing plate is provided with a top elastic abutting piece right opposite to the top of the transmission block, and a lower die base is provided with a bottom elastic abutting piece right opposite to the bottom of the transmission block. The top elastic abutting piece and the bottom elastic abutting piece drive the transmission block to move longitudinally through elastic abutting. The elastic force of the bottom elastic abutting piece is larger than that of the top elastic abutting piece. The limiting sliding block is arranged on the lower die pressing plate and can move in the transverse direction, the limiting sliding block is located on one side of the opposite ejecting block and can move to the bottom of the opposite ejecting block, an elastic locking piece is arranged at the bottom of the opposite ejecting block, and a limiting groove allowing the elastic locking piece to be inserted is formed in the top of the limiting sliding block; the lever swing part is coupled to the lower die pressing plate, a swing arm at one end of the lever swing part is connected with the transmission block, and a swing arm at the other end of the lever swing part is connected with the limiting sliding block.

Description

Technical Field

[0001] The invention relates to the technical field of pressing dies, and in particular discloses a delayed release mechanism of a pressing plate of an upper die of a pressing die and the pressing die. Background Art

[0002] In the automotive manufacturing and other industrial product processing, molds are core process equipment for achieving precision forming of parts. Drawing dies, in particular, are widely used in the mass production of complex curved parts due to their excellent surface forming capabilities. The working principle of the press-and-flanging die is based on the coordinated movement of the upper and lower molds. Through the interaction between the mold surface and the sheet material, the sheet material undergoes plastic deformation, ultimately producing a part with a specific geometric shape and dimensional accuracy.

[0003] However, in production practice, the traditional press-and-flanging die opening process faces a key technical bottleneck: when the upper press platen rapidly releases force as the upper die rises, the lower press plate, driven by the nitrogen spring, will simultaneously rise. This kinematic coupling effect causes the upper press platen to be squeezed by the lower press platen after the part is formed, causing shape distortion and even irreparable scrap. This technical flaw not only severely impacts the dimensional accuracy and surface quality of the product, resulting in a decrease in the pass rate, but also significantly increases material loss and production costs, resulting in a double negative impact on the company's production efficiency and economic benefits. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a delayed release mechanism for a pressing plate of an upper mold of a pressing mold and a pressing mold.

[0005] On the one hand, the present invention discloses a delayed release mechanism for the upper die pressing plate of a pressing die, which adopts the following technical solution:

[0006] A delayed release mechanism for an upper die pressing plate of a pressing die, wherein the delayed release mechanism is provided in the pressing die, wherein the pressing die comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises an upper die base, an upper die pressing plate elastically mounted on the upper die base by means of an upper die elastic connector, and a top block mounted on the upper die pressing plate; wherein the lower die assembly comprises a lower die base, a lower die pressing plate elastically mounted on the lower die base by means of a lower die elastic connector, and a lower die punch mounted on the lower die base;

[0007] It is characterized in that the delayed release mechanism includes:

[0008] The transmission block is arranged on the lower die pressing plate and can move in the longitudinal direction. The lower die pressing plate is equipped with a top elastic abutment facing the top of the transmission block, and the lower die base is equipped with a bottom elastic abutment facing the bottom of the transmission block. The top elastic abutment and the bottom elastic abutment drive the transmission block to move longitudinally through elastic abutment. The elastic force of the bottom elastic abutment is greater than the elastic force of the top elastic abutment, and the elastic force of the lower die elastic connecting member is greater than the elastic force of the upper die elastic connecting member.

[0009] A limiting slider is provided on the lower die pressing plate and can move in the transverse direction. The limiting slider is located on one side of the top block and can move to the bottom of the top block. An elastic locking piece is provided at the bottom of the top block, and a limiting groove for inserting the elastic locking piece is provided at the top of the limiting slider;

[0010] A lever swinging member is axially connected to the lower die pressing plate, a swing arm at one end of the lever swinging member is connected to the transmission block, and a swing arm at the other end is connected to the limit sliding block.

[0011] Preferably, the lever swing part includes an axial connection part, a transverse swing arm part and a longitudinal swing arm part, the axial connection part is provided with a rotating shaft and is axially connected to the lower mold pressing plate, the longitudinal swing arm part is provided with a first swing arm round head, the limiting slider is provided with a first sliding groove for assembling the first swing arm round head, the transverse swing arm part is provided with a second swing arm round head, and the transmission block is provided with a second sliding groove for assembling the second swing arm round head.

[0012] Preferably, the ratio of the distance L1 from the rotating shaft of the lever swing member to the round head of the first swing arm to the distance L2 from the rotating shaft to the round head of the second swing arm is 1.5-2.

[0013] Preferably, the angle between the transverse swing arm portion and the longitudinal swing arm portion of the lever swing member is 90° to 120°.

[0014] Preferably, when the limiting sliding block moves to the bottom of the top block, the lever swinging member rotates until the longitudinal swinging arm portion is in the longitudinal direction.

[0015] Preferably, the upper die seat is provided with an upper die flanging knife block, and the lower die punch is provided with a lower die flanging knife seat matching the upper die flanging knife block.

[0016] Preferably, the elastic locking member comprises: an ejection pin and a rectangular spring for pre-pressing the ejection pin.

[0017] Preferably, the upper mold elastic connecting member, the lower mold elastic connecting member, the top elastic abutting member and the bottom elastic abutting member are all nitrogen springs.

[0018] Preferably, when the sheet material is pressed downward by the upper die assembly and drives the lower die pressing plate to move downward together, the transmission block contacts the bottom elastic abutment and overcomes the elastic force of the top elastic abutment, and the shaft joint of the lever swinging member and the transmission block generate longitudinal displacement, driving the lever swinging member to rotate and push the limit slider to move laterally and press against the side of the top block;

[0019] When the pressing die is in place, the limit slider follows the lower die pressing plate and moves downward to disengage from the side of the top block. The compressed bottom elastic abutment releases its elastic force to push the transmission block upward. The transmission block drives the limit slider to be pushed into the bottom of the top block through the lever swing member. The elastic locking member springs into the limit groove to limit the lateral movement of the limit slider relative to the top block.

[0020] When the pressing mold is opened, the lower mold elastic connecting part releases the elastic force first and pushes the lower mold pressing plate and the upper mold pressing plate to move up synchronously. After the lower mold elastic connecting part completely releases the elastic force, the limit slider and the top block remain locked and pressed together under the action of the elastic locking part, and the upper mold base continues to move upward until the upper mold elastic connecting part completely releases the elastic force. Then the top block of the upper mold pressing plate leaves the limit slider of the lower mold base, and the top elastic abutment releases the elastic force to push the transmission block downward. The transmission block drives the limit slider to move horizontally and reset through the lever swinging part.

[0021] On the other hand, the present invention discloses a pressing die, comprising an upper die assembly, a lower die assembly and the delayed release mechanism.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] The delayed release mechanism of the upper die pressing plate of the pressing die of the present invention realizes the delayed release function of the upper die pressing plate by setting structures such as a transmission block, a limiting slider, a lever swinging member and an elastic abutment member. During the mold opening process, the lower die pressing plate and the upper die pressing plate move up synchronously until the lower die pressing plate is reset. The limiting slider of the lower die pressing plate and the top block of the upper die pressing plate remain locked and abut under the action of the elastic locking member, thereby delaying the release of the upper die pressing plate, avoiding the problem of part shape distortion or damage caused by the rapid unloading of the upper die pressing plate, significantly improving the dimensional accuracy and surface quality of the product, reducing the scrap rate, while reducing material loss and production costs, and improving production efficiency and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1-6 Schematic diagram of the mold closing and mold opening process states of the pressing mold and the upper mold pressing plate delayed release mechanism of this embodiment;

[0025] Figure 7This is a force analysis diagram of the prior art blank holder anti-back-up mechanism during mold closing;

[0026] Figure 8 for Figure 7 Static analysis simulation model diagram of the pendulum block using UG software;

[0027] Figure 9 This is a force analysis diagram of the upper mold press plate delayed release mechanism during mold closing;

[0028] Figure 10 for Figure 9 Static analysis simulation model diagram of the lever swing part using UG software;

[0029] Figure 11 for Figure 9 Static analysis simulation model diagram of the limit slider in UG software

[0030] Figure 12 This is a schematic diagram of the structure of the lever swing member of this embodiment.

[0031] Description of Figure Numbers:

[0032] 1. Upper die base; 101. Upper die flanging knife block; 2. Upper die pressing plate; 3. Top block; 301. Elastic locking piece;

[0033] 4. Lower die base; 5. Lower die press plate; 6. Lower die punch; 601. Lower die flanging tool holder;

[0034] 7. Transmission block; 8. Limiting slider; 801. Limiting groove; 9. Lever swinging member; 901. Rotating shaft; 902. Round head of first swing arm; 903. Round head of second swing arm; 10. Top elastic abutment member; 11. Bottom elastic abutment member. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] This embodiment discloses a pressing die, which includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base 1, an upper die pressing plate 2 elastically assembled on the upper die base 1 by providing an upper die elastic connector (not shown in the accompanying drawings), and a top block 3 assembled on the upper die pressing plate 2; the lower die assembly includes a lower die base 4, a lower die pressing plate 5 elastically assembled on the lower die base 4 by providing a lower die elastic connector (not shown in the accompanying drawings), and a lower die punch 6 assembled on the lower die base 4. In this embodiment, the upper die elastic connector and the lower die elastic connector can both be nitrogen springs. The upper die base 1 is provided with an upper die flanging knife block 101, and the lower die punch 6 is provided with a lower die flanging knife base 601 that matches the upper die flanging knife block 101. When the pressing die is closed, the upper die pressing plate 2 presses the sheet material against the lower die punch 6, compressing the upper die elastic connector. As the upper die holder 1 continues to descend, the upper die flanging knife block 101 of the upper die holder 1 cooperates with the lower die flanging knife holder 601 to flanging the sheet material's flanging area downward. The upper die holder 1 continues to descend until the lower die elastic connector is compressed, causing the lower die pressing plate 5 to move down to the bottom, completing the stamping of the sheet material. In the prior art, at the moment the pressing die is opened, the lower die pressing plate 5 is rapidly lifted due to the drive of the compressed nitrogen spring, causing the upper die pressing plate 2 to be released and squeezed by the lower die pressing plate 5 after the part is formed. The strong impact can easily cause the shape of the product to be distorted or even cause irreparable waste.

[0037] In this regard, this embodiment proposes a delayed release mechanism for the upper mold pressing plate of the pressing mold, which is arranged in the pressing mold and includes: a transmission block 7, a limiting slider 8, a lever swinging member 9, a top elastic abutment 10, a bottom elastic abutment 11 and an elastic locking member 301.

[0038] See also Figure 1-6 The transmission block 7 is mounted on the lower die platen 5 and is movable longitudinally. The top elastic abutment 10 is mounted on the lower die platen 5 and faces the top of the transmission block 7. The bottom elastic abutment 11 is mounted on the lower die base 4 and faces the bottom of the transmission block 7. In this embodiment, both the top elastic abutment 10 and the bottom elastic abutment 11 can be nitrogen springs. Furthermore, the elastic force of the bottom elastic abutment 11 is greater than that of the top elastic abutment 10. The elastic force of the lower die elastic connector is greater than that of the upper die elastic connector.

[0039] The limiting slider 8 is set on the lower mold pressing plate 5 and can be moved laterally. The limiting slider 8 is located on one side of the top block 3 and can be moved to the bottom of the top block 3. The elastic locking piece 301 is set at the bottom of the top block 3. The top of the limiting slider 8 is provided with a limiting groove 801 for inserting the elastic locking piece 301. In this embodiment, the elastic locking piece 301 can specifically include a spring pin and a rectangular spring for pre-stressing the spring pin.

[0040] The lever swing member 9 is axially connected to the lower die pressing plate 5. One end of the lever swing member 9 is connected to the transmission block 7, and the other end is connected to the limit slider 8. In this embodiment, the lever swing member 9 includes a shaft connection portion, a transverse swing arm portion, and a longitudinal swing arm portion. The shaft connection portion is provided with a rotating shaft 901 axially connected to the lower die pressing plate 5. The longitudinal swing arm portion is provided with a first swing arm round head 902. The limit slider 8 is provided with a first slide groove for assembling the first swing arm round head 902. The transverse swing arm portion is provided with a second swing arm round head 903. The transmission block 7 is provided with a second slide groove for assembling the second swing arm round head 903.

[0041] The working process of the pressing die and delayed release mechanism of this scheme is as follows:

[0042] (1) Placing the sheet material to be stamped: The pressing die is opened so that there is a space between the upper die assembly and the lower die assembly, and the sheet material to be stamped can be placed in the space.

[0043] (2) Press down the sheet metal: see Figure 1 , the pressing mold begins to close, the upper mold assembly moves downward, the upper mold base 1 drives the upper mold pressing plate 2 and the top block 3 to move downward together, until the upper mold pressing plate 2 presses the sheet material tightly against the lower mold punch 6. At this time, the upper mold base 1 continues to move downward, the upper mold pressing plate 2 is supported by the lower mold punch 6 and is relatively still, and the upper mold elastic connector begins to compress.

[0044] (3) Flanging start: see Figure 2 When the mold is about to close (about 30mm distance), the upper mold flanging knife block 101 of the upper mold base 1 holds the sheet material against the lower mold flanging knife base 601 and pushes the flanging area of ​​the sheet material downward, at this time driving the lower mold pressing plate 5 to move downward together until the transmission block 7 contacts the bottom elastic abutment 11.

[0045] (4) Rotation of the lever swing member: see Figure 3 , the upper mold base 1 continues to descend, and when the mold is about to close (about 25mm distance), since the elastic force of the bottom elastic abutment 11 is greater than the elastic force of the top elastic abutment 10, the transmission block 7 is supported by the bottom elastic abutment 11 and overcomes the elastic force of the top elastic abutment 10 to remain relatively stationary, so that the axial joint of the lever swing member 9 and the transmission block 7 form a longitudinal displacement, thereby driving the lever swing member 9 to rotate and push the limit slider 8 to move horizontally, and slide against the side of the top block 3.

[0046] (5) Pressing mold closing and locking: see Figure 4, the upper die base 1 continues to descend until the transmission block 7 overcomes the elastic force of the bottom elastic abutment 11 and continues to move downward. At the moment the pressing mold is in place, the limit slider 8 follows the lower die pressing plate 5 and moves down to disengage from the side of the top block 3. At the same time, the compressed bottom elastic abutment 11 releases the elastic force and pushes the transmission block 7 to jump up. The transmission block 7 drives the limit slider 8 to quickly push into the bottom of the top block 3 through the lever swing member 9. The moment the limit slider 8 is in place, the elastic locking member 301 immediately bounces into the limit groove 801, limiting the relative lateral movement of the limit slider 8 and the top block 3.

[0047] (6) Opening the pressing mold: see Figure 5 , the upper die base 1 starts to return and rise, and the lower die elastic connector (with greater force) releases the elastic force first, pushing the lower die pressing plate 5 and the upper die pressing plate 2 to move up synchronously until the lower die elastic connector completely releases the elastic force and the lower die pressing plate 5 is reset. At this time, the limit slider 8 and the top block 3 remain locked and pressed against each other under the action of the elastic locking member 301, so that the upper die pressing plate 2 is delayed in releasing when the mold is opened, preventing the upper die pressing plate 2 from quickly unloading the force and causing the lower die pressing plate 5 to return to the top, resulting in shape distortion or damage to the parts.

[0048] (7) Release of upper and lower pressing plates: see Figure 6 After the elastic connecting part of the lower mold completely releases the elastic force, the elastic connecting part of the upper mold begins to release the elastic force until it is completely released, and the upper mold base 1 continues to move upward (about 5mm), so that the top block 3 of the upper mold pressing plate 2 leaves the limit slider 8 of the lower mold pressing plate 5, and the top elastic abutment 10 releases the elastic force to push the transmission block 7 downward, and the transmission block 7 drives the limit slider 8 to move horizontally and reset through the lever swinging part 9.

[0049] To verify the advantages of the delayed release mechanism of this embodiment over the existing press plate anti-return mechanism (such as a molding press plate anti-return structure disclosed in patent CN216989532U), see Figure 7-8 , through force analysis, the direct force body of the traditional mechanism is the pendulum block ( Figure 10 12), there may be deformation near the shaft hole of the pendulum block, which causes the hole or the shaft to wear out easily and leads to a short service life. What's worse, the lever cannot rotate after wear, causing more serious damage to the mold during production.

[0050] Unlike traditional institutions, such as Figure 9-11 As shown, the main force-bearing bodies of the delayed release mechanism of this scheme are the limit slider and the top block. The contact area between the two is large, which can withstand the greater force generated when the pressing die is working. When bearing a force of 1800442N (about 18 tons), the strength of the lever swing part 9 and the limit slider 8 is still very good, which can better extend the life of the mechanism and ensure production safety.

[0051] It can be seen that this solution organically combines the structures such as the transmission block 7, the limit slider 8, the lever swing member 9 and the top block 3, so that the delayed release mechanism can greatly increase the strength it can withstand, and overcomes the problem of limited usage scenarios of traditional mechanisms due to force problems. The delayed release mechanism of this solution can be applied to pressing molds with a larger force range.

[0052] As a preferred solution, refer to Figure 12 In this embodiment, the distance L1 from the rotating shaft 901 of the lever swing member 9 to the first swing arm round head 902 is greater than the distance L2 from the rotating shaft 901 to the second swing arm round head 903. The ratio of L1 to L2 is preferably in the range of 1.5 to 2. In addition, the angle between the transverse swing arm portion and the longitudinal swing arm portion of the lever swing member 9 (i.e., the angle between the intersection of L1 and L2) is 90° to 120°. By adopting such a design, the lever swing member 9 is subjected to more balanced force, has better strength, and has no deformation of the rotating shaft hole. Moreover, when the limiting slider 8 moves to the bottom of the top block 3, the lever swing member 9 rotates until the longitudinal swing arm portion is in the longitudinal direction, so that the delayed release mechanism mainly occupies the vertical space in the pressing mold and occupies less space in the horizontal direction. In this way, the mold size can be reduced and the cost can be saved.

[0053] By adopting the special structure proposed in this technical solution, it is possible to break through the spatial limitations of traditional mold design and achieve a more compact mold layout while maintaining the same effective working surface size. This structure, through the rational coordination of moving parts, not only ensures the movement reliability of each functional module within a limited space, but also significantly improves material utilization. Practice has proven that this method can not only save approximately 15-25% of mold material consumption, but also improve production cycle time due to the shortened step distance, reducing the average single stamping cycle by 0.5-1.2 seconds, thereby achieving significant improvements in equipment operating efficiency and energy consumption. At the same time, this structural design maintains good stability and service life, fully meeting the requirements of mass production of automotive parts.

[0054] The technical solution provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A delay-release mechanism for an upper die pressing plate of a pressing die, wherein the delay-release mechanism is provided in the pressing die, wherein the pressing die comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises an upper die base, an upper die pressing plate elastically mounted on the upper die base by means of an upper die elastic connector, and a top block mounted on the upper die pressing plate; wherein the lower die assembly comprises a lower die base, a lower die pressing plate elastically mounted on the lower die base by means of a lower die elastic connector, and a lower die punch mounted on the lower die base; It is characterized in that The delayed-release mechanism comprises: The transmission block is arranged on the lower die pressing plate and can move in the longitudinal direction. The lower die pressing plate is equipped with a top elastic abutment facing the top of the transmission block, and the lower die base is equipped with a bottom elastic abutment facing the bottom of the transmission block. The top elastic abutment and the bottom elastic abutment drive the transmission block to move longitudinally through elastic abutment. The elastic force of the bottom elastic abutment is greater than the elastic force of the top elastic abutment, and the elastic force of the lower die elastic connecting member is greater than the elastic force of the upper die elastic connecting member. A limiting slider is provided on the lower die pressing plate and can move in the transverse direction. The limiting slider is located on one side of the top block and can move to the bottom of the top block. An elastic locking piece is provided at the bottom of the top block, and a limiting groove for inserting the elastic locking piece is provided at the top of the limiting slider; A lever swinging member is axially connected to the lower die pressing plate, a swing arm at one end of the lever swinging member is connected to the transmission block, and a swing arm at the other end is connected to the limit sliding block.

2. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 1, characterized in that: The lever swing part includes an axial connection part, a transverse swing arm part and a longitudinal swing arm part. The axial connection part is provided with a rotating shaft and is axially connected to the lower mold pressing plate. The longitudinal swing arm part is provided with a first swing arm round head. The limiting slider is provided with a first sliding groove for assembling the first swing arm round head. The transverse swing arm part is provided with a second swing arm round head. The transmission block is provided with a second sliding groove for assembling the second swing arm round head.

3. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 2, characterized in that: The ratio of the distance L1 from the rotating shaft of the lever swing member to the round head of the first swing arm to the distance L2 from the rotating shaft to the round head of the second swing arm is 1.5-2.

4. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 2, characterized in that: The included angle between the transverse swing arm portion and the longitudinal swing arm portion of the lever swing member is 90° to 120°.

5. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 2, characterized in that: When the limiting sliding block moves to the bottom of the top block, the lever swinging member rotates until the longitudinal swinging arm portion is in the longitudinal direction.

6. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 1, characterized in that: The upper die seat is provided with an upper die flanging knife block, and the lower die punch is provided with a lower die flanging knife seat matched with the upper die flanging knife block.

7. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 1, characterized in that: The elastic locking member comprises an ejection pin and a rectangular spring for pre-pressing the ejection pin.

8. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 1, characterized in that: The upper mold elastic connecting piece, the lower mold elastic connecting piece, the top elastic abutting piece and the bottom elastic abutting piece are all nitrogen springs.

9. The delayed release mechanism of the upper die pressing plate of the pressing die according to claim 1, characterized in that: When the sheet material is pressed down by the upper die assembly and drives the lower die pressing plate to move downward together, the transmission block contacts the bottom elastic abutment and overcomes the elastic force of the top elastic abutment, and the shaft joint of the lever swinging member and the transmission block form a longitudinal displacement, driving the lever swinging member to rotate and push the limit slider to move horizontally and press against the side of the top block; When the pressing die is in place, the limit slider follows the lower die pressing plate and moves downward to disengage from the side of the top block. The compressed bottom elastic abutment releases its elastic force to push the transmission block upward. The transmission block drives the limit slider to be pushed into the bottom of the top block through the lever swing member. The elastic locking member springs into the limit groove to limit the lateral movement of the limit slider relative to the top block. When the pressing mold is opened, the lower mold elastic connecting part releases the elastic force first and pushes the lower mold pressing plate and the upper mold pressing plate to move up synchronously. After the lower mold elastic connecting part completely releases the elastic force, the limit slider and the top block remain locked and pressed together under the action of the elastic locking part, and the upper mold base continues to move upward until the upper mold elastic connecting part completely releases the elastic force. Then the top block of the upper mold pressing plate leaves the limit slider of the lower mold base, and the top elastic abutment releases the elastic force to push the transmission block downward. The transmission block drives the limit slider to move horizontally and reset through the lever swinging part.

10. A pressing die, comprising an upper die assembly and a lower die assembly, characterized in that: Comprising the delayed-release mechanism according to any one of claims 1 to 9.

Images