Die stripper locking mechanism and die tooling

Abstract

The present application relates to punch equipment technical field, specifically disclose a die stripper plate locking mechanism and die tool;Among them, the die stripper plate locking mechanism includes sleeve, sleeve is sleeved on the outside of the sleeve, the sleeve is sleeved in the sleeve and moves along the vertical wedge, the sleeve is slidably installed on the sleeve and is in sliding cooperation with the wedge slider assembly, the sleeve is sleeved in the sleeve and is located at the bottom of the wedge and is in abutment with the wedge locking spring, the screw plug is installed on the top of the sleeve, and the stripper spring is sleeved in the sleeve and is located between the upper die and the upper stripper plate;The end of the wedge passes through the screw plug;In the initial state, the stripper spring, locking spring is in pre-compression state. And disclose the die tool;The present application can effectively make the punch piece above the manipulator during unloading, so as to facilitate the punch piece falling on the manipulator after unloading;At the same time, it can effectively avoid the shear deformation of the punch plane, effectively ensure that the upper stripper plate can press the punch material during blanking.

Description

Technical Field

[0001] This invention relates to the field of punch press equipment technology, and more specifically, to a punch die unloading plate locking mechanism and punch die tooling. Background Technology

[0002] Currently, in order to meet the material receiving requirements of robotic arms, the dies used in the industry for automatic punching presses typically employ a design where the lower stripper plate of the lower die only presses against the scrap area during punching, while the upper stripper plate of the upper die does not constrain the punch in the vertical direction of the punching area. This approach leads to planar shear deformation of thin sheet metal punches, such as generator stator punches, under shearing forces during punching, which is particularly noticeable in areas with complex shearing shapes. In stamping production, blanking is the only means to control planar shear deformation of punches. Therefore, this proposal aims to address the goal of adopting a new stamping process to produce high-quality punches in automated production.

[0003] Existing technologies employ suction cup and magnetic adsorption methods, combined with the blanking structure of ordinary molds, to meet the material receiving requirements of robotic arms. However, because the mold unloading springs in these two methods are always under elastic compression during the blanking stroke, the blank is pressed back into the scrap by the upper unloading plate the instant the upper mold rises after blanking, easily leading to localized deformation due to interference. Furthermore, due to the influence of the floating pins and the ejection height of the upper unloading plate, the blank and scrap are not on the same plane, resulting in significant uncertainty in how the suction cup or magnetic force pulls the blank from the scrap, leading to poor operational stability. Additionally, suction cup vacuum adsorption is affected by factors such as temperature, particulate dust, blank thickness, suction cup sealing performance, and the decrease in vacuum during high-speed blanking, resulting in poor operational stability. Magnetic adsorption can accumulate metal particles generated during blanking, magnetize the module, and cause indentations and scratches on the pre-coated paint film on the blank surface. Ultimately, its use was abandoned due to unsatisfactory application results.

[0004] The existing technology lacks an automatic punching die used on an automated punching press in an automated production line. In order to control the planar shearing deformation of the punch sheet, it is necessary to have a wedge-shaped locking mechanism for the upper unloading plate of the punching die that can both perform blanking and allow the punch sheet to be embedded in the upper mold cavity and raised after blanking to meet the material receiving method of the robot arm reaching into the die. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a punching die unloading plate locking mechanism and a punching die tooling; which can effectively make the punch piece above the robot arm during unloading, so that the punch piece can fall onto the robot arm after unloading; at the same time, it can effectively avoid shearing deformation of the punch piece plane and effectively ensure that the upper unloading plate can press the punch piece material during punching.

[0006] The solution adopted by this invention to solve the technical problem is:

[0007] A die stripper plate locking mechanism is installed on an upper die and connected to an upper stripper plate. It includes a sleeve, a sliding sleeve fitted on the outside of the sleeve, a wedge-shaped member fitted inside the sleeve and moving vertically, a slider assembly slidably installed on the sleeve and slidingly engaged with the wedge-shaped member, a locking spring fitted inside the sleeve, located at the bottom of the wedge-shaped member and abutting against the wedge-shaped member, a screw plug installed on the top of the sleeve, and a stripper spring fitted on the sleeve and located between the upper die and the upper stripper plate. One end of the wedge-shaped member passes through the screw plug. In the initial state, the stripper spring and the locking spring are in a pre-compressed state.

[0008] This invention achieves the functions of pressing and self-locking by the interaction of two opposing spring forces: a locking spring and a discharge spring.

[0009] During self-locking, the unloading spring is compressed by the force of the stamping motion, while the upper unloading plate pushes the sleeve upward, and the sleeve also drives the slider assembly to move upward. At this time, a gap appears between the slider assembly and the sliding sleeve. Under the action of the locking spring, the wedge is pushed upward, and during the movement, the wedge pushes the slider assembly to move horizontally. When the sleeve stops moving upward, under the action of the unloading spring, the upper unloading plate and the sleeve tend to move downward; however, under the friction of the contact surfaces between the sliding sleeve, the wedge, and the slider assembly, as well as the action of the locking spring, the friction between the slider assembly and the slider sleeve prevents the upper unloading plate and the sleeve from moving downward, thus completing the self-locking.

[0010] When the self-locking mechanism is released, the punching mechanism pushes the wedge to compress the locking spring and move downwards, creating a gap between the wedge and the slide block assembly. Under the action of the unloading spring, the upper unloading plate and sleeve begin to move downwards, simultaneously causing the sleeve to move the slide block assembly downwards as well. During this movement, the sliding sleeve pushes the slide block assembly horizontally. When the wedge stops moving downwards, the self-locking is completed simultaneously under the action of the locking spring.

[0011] In some possible implementations, in order to effectively achieve the engagement between the wedge and the sliding assembly;

[0012] The wedge-shaped component includes a trapezoidal wedge portion fitted inside a sleeve, and a transmission rod with one end passing through a screw plug and the other end connected to the wedge portion; the small end of the wedge portion is connected to one end of the transmission rod.

[0013] In some possible implementations,

[0014] The slider assembly consists of two sets, which are evenly arranged along the circumference of the sleeve. An installation groove is provided on the sleeve and communicates with the inner side of the sleeve. A retaining groove is provided on the inner side of the slider to cooperate with the installation groove and form an installation cavity. The retaining groove and the installation groove are arranged in a one-to-one correspondence. The slider assembly is installed in the installation cavity.

[0015] In some possible implementations, in order to effectively limit the amount of vertical displacement of the wedge;

[0016] A limit block is provided at the top of the wedge-shaped portion.

[0017] In some possible implementations, in order to effectively achieve the cooperation between the wedge portion and the slider assembly;

[0018] The slider assembly is an inclined slider, and the inner side of the slider assembly is provided with an inclined surface that cooperates with the outer side of the wedge-shaped part; the outer side of the slider assembly is inclined, and the bottom surface of the slot is inclined and slides in cooperation with the outer side of the slider assembly.

[0019] In some possible implementations,

[0020] The vertical depth of the slot is greater than the vertical length of the slider assembly.

[0021] on the other hand:

[0022] The present invention also discloses a punching die fixture, including an upper die with an upper mold cavity at the bottom, an upper stripper plate located in the upper mold cavity, a punching die stripper plate locking mechanism installed on the upper die as described above and connected to the upper stripper plate at the bottom, and a punching plate used in conjunction with the top of the punching die stripper plate locking mechanism; the top of the wedge-shaped member penetrates the upper die and is used in conjunction with the punching plate.

[0023] In some possible implementations,

[0024] The top of the upper mold is provided with a groove A for installing a sliding sleeve, a groove B coaxially connected to groove A and used for a sleeve, and a groove C coaxially connected to groove B and located at the bottom of the upper mold; the unloading spring is installed in groove C; groove C is connected to the upper mold cavity; the diameter of groove A is larger than the diameter of groove B.

[0025] In some possible implementations,

[0026] It also includes a lower unloading mechanism located directly below the upper mold, and a feeding mechanism that is connected to the feeding plate via a drive.

[0027] In some possible implementations,

[0028] The unloading mechanism includes a lower mold and an unloading plate elastically connected to the lower mold.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] This invention can effectively position the punch above the robot arm during unloading, so that the punch falls onto the robot arm after unloading; at the same time, it can effectively avoid shearing deformation of the punch plane and effectively ensure that the upper unloading plate can press the punch material tightly during punching.

[0031] This invention can effectively ensure that the punched blank is located in the upper mold cavity; the blank will only be released from the upper mold cavity after the feeding mechanism applies force to the feeding plate; it can realize both pressing and punching and allow the blank to be embedded in the upper mold cavity and raised after punching to meet the material receiving method of the robot arm reaching into the mold. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the die unloading plate locking mechanism in this invention;

[0033] Figure 2 for Figure 1 A sectional view;

[0034] Figure 3 This is a schematic diagram of the sliding sleeve in this invention;

[0035] Figure 4 This is a schematic diagram of the structure of the sleeve, sliding sleeve, wedge, and slider assembly in this invention;

[0036] Figure 5 This is a schematic diagram of the wedge-shaped component in this invention;

[0037] Figure 6 This is a schematic diagram of the die tooling in this invention;

[0038] Figure 7 for Figure 6 A sectional view;

[0039] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0040] The components are: 1. Sleeve; 2. Sliding sleeve; 21. Slot; 3. Wedge; 31. Wedge part; 32. Limiting block; 33. Transmission rod; 4. Slider assembly; 5. Locking spring; 6. Plug; 7. Unloading spring; 10. Upper mold; 101. Upper mold cavity; 102. Upper unloading plate; 20. Lower mold; 30. Bolt; 40. Ejector plate; 50. Robot arm. Detailed Implementation

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] The present invention will now be described in detail.

[0043] like Figures 1-8 As shown:

[0044] A die ejector plate locking mechanism is installed on an upper die 10 and connected to an upper ejector plate 102. It includes a sleeve 1, a sliding sleeve 2 fitted outside the sleeve 1, a wedge-shaped member 3 fitted inside the sleeve 1 and moving vertically, a slider assembly 4 slidably mounted on the sleeve 1 and slidingly engaged with the wedge-shaped member 3, a locking spring 5 fitted inside the sleeve 1, located at the bottom of the wedge-shaped member 3 and abutting against it, a screw plug 6 installed at the top of the sleeve 1, and an ejector spring 7 fitted on the sleeve 1 and located between the upper die 10 and the upper ejector plate 102. One end of the wedge-shaped member 3 passes through the screw plug 6. In the initial state, the ejector spring 7 and the locking spring 5 are in a pre-compressed state, thereby effectively enabling a transmission connection.

[0045] This invention achieves the pressing and self-locking functions through the interaction of two opposing spring forces, the locking spring 5 and the unloading spring 7; and utilizes the self-locking angle principle to achieve the self-locking function through friction.

[0046] During self-locking, the unloading spring 7 is compressed by the force of the stamping motion, while the upper unloading plate 102 pushes the sleeve upward, and the sleeve 1 drives the slider assembly 4 to move upward as well. At this time, a gap appears between the slider assembly 4 and the sliding sleeve 2. Under the action of the locking spring 5, the wedge 3 is pushed upward, and during the movement, the wedge 3 pushes the slider assembly 4 to move horizontally. When the sleeve 1 stops moving upward, under the action of the unloading spring 7, the upper unloading plate 102 and the sleeve 1 tend to move downward; however, under the friction of the contact surfaces between the sliding sleeve 2, the wedge 3, and the slider assembly 4, and under the action of the locking spring 5, the friction between the slider assembly 4 and the slider sleeve can prevent the upper unloading plate 102 and the sleeve 1 from moving downward, thus completing the self-locking.

[0047] When the self-locking mechanism is released, the wedge 3 is pushed downward by the punching mechanism to compress the locking spring 5, creating a gap between the wedge 3 and the slide assembly 4. Under the action of the unloading spring 7, the upper unloading plate 102 and the sleeve 1 begin to move downward, while the sleeve 1 also drives the slide assembly 4 downward. During this movement, the sliding sleeve 2 pushes the slide assembly 4 horizontally. When the wedge 3 stops moving downward, the self-locking is completed simultaneously under the action of the locking spring 5.

[0048] In some possible implementations, in order to effectively achieve the cooperation between the wedge 3 and the sliding assembly;

[0049] The wedge-shaped component 3 includes a trapezoidal wedge-shaped part 31 fitted inside the sleeve 1, and a transmission rod 33 with one end passing through the screw plug 6 and the other end connected to the wedge-shaped part 31; the small end of the wedge-shaped part 31 is connected to one end of the transmission rod 33.

[0050] In some possible implementations,

[0051] The slider assembly 4 consists of two sets, which are evenly arranged around the circumference of the sleeve 1. The sleeve 1 is provided with an installation groove that is connected to the inner side of the sleeve 1. The inner side of the sliding sleeve 2 is provided with a slot 21 that cooperates with the installation groove and forms an installation cavity. The slot 21 and the installation groove are provided in a one-to-one correspondence. The slider assembly 4 is installed in the installation cavity.

[0052] In some possible implementations, in order to effectively limit the vertical displacement of the wedge 3;

[0053] A limiting block 32 is provided at the top of the wedge-shaped portion 31.

[0054] Preferably, a through hole is provided on the screw plug 6 for the transmission rod 33 to pass through; the limiting block 32 will be located between the screw plug 6 and the slider assembly 4, and the outer diameter of the limiting block 32 will be larger than the diameter of the through hole.

[0055] In some possible implementations, in order to effectively achieve the cooperation between the wedge portion 31 and the slider assembly 4;

[0056] The slider assembly 4 is an inclined slider, and the inner side of the slider assembly 4 is provided with an inclined surface that cooperates with the outer surface of the wedge-shaped part 31; the outer surface of the slider assembly 4 is inclined, and the bottom surface of the slot 21 is inclined and slides in cooperation with the outer surface of the slider assembly 4.

[0057] In some possible implementations,

[0058] The vertical depth of the slot 21 is greater than the vertical length of the slider assembly 4.

[0059] on the other hand:

[0060] The present invention also discloses a punching die fixture, including an upper die 10 with an upper mold cavity 101 at the bottom, an upper stripper plate 102 located in the upper mold cavity 101, a punching die stripper plate locking mechanism installed on the upper die 10 as described above and connected to the upper stripper plate 102 at the bottom, and a punching plate 40 used in conjunction with the top of the punching die stripper plate locking mechanism; the top of the wedge 3 penetrates the upper die 10 and is used in conjunction with the punching plate 40.

[0061] The upper unloading plate 102 is connected to the sleeve 1 by bolts 30. The unloading spring 7 is fitted on the outside of the sleeve 1, with one end abutting against the upper unloading plate 102 and the other end abutting against the bottom of the upper mold 10, and is in a compressed state.

[0062] The sleeve 1 is provided with a mounting hole for installing the locking spring 5, and the mounting hole is coaxial with the sleeve 1; the large end of the wedge 3 will be located in the mounting hole; the locking spring 5 is installed in the mounting hole in a compressed state and always abuts against the bottom of the wedge 3.

[0063] A bolt hole is provided at the end of the sleeve 1 away from the wedge block. The diameter of the bolt hole is smaller than the diameter of the mounting hole, thus forming a mounting surface for the locking spring 5, which is used to install the locking spring 5 at the end away from the wedge block 3.

[0064] In some possible implementations,

[0065] The top of the upper mold 10 is provided with a groove A for installing the sliding sleeve 2, a groove B coaxially connected to the groove A and used for the sleeve 1, and a groove C coaxially connected to the groove B and located at the bottom of the upper mold 10; the unloading spring 7 is installed in the groove C; the groove C is connected to the upper mold cavity 101; the diameter of the groove A is larger than the diameter of the groove B.

[0066] In some possible implementations,

[0067] It also includes a lower unloading mechanism located directly below the upper mold 10, and a feeding mechanism that is connected to the feeding plate 40 via a transmission.

[0068] The unloading mechanism is the same as that in existing punch presses. The improvement of this invention does not lie in the internal structure of the unloading mechanism, which will not be described in detail here.

[0069] In some possible implementations,

[0070] The unloading mechanism includes a lower mold 20 and an unloading plate elastically connected to the lower mold 20.

[0071] During the blanking process, the upper die 10 mounted on the worktable of the punch press moves downwards, causing the upper stripper plate 5 102 to press against the sheet metal. The punching continues downwards, and the cut-off blanks are pushed off the upper stripper plate 102 by the lower die 20.

[0072] The upper mold cavity 101 of the upper mold 10 is inserted; during punching, the upper stripper plate 102 compresses the stripper spring 7 and pushes the sleeve 1 upward, while the sleeve 1 drives the inclined slider to move upward as well; at this time, a gap will appear between the inclined slider and the bottom surface of the slot 21; under the action of the locking spring 5, the wedge-shaped part 31 is pushed upward, and during the movement...

[0073] During the process, the inclined surface of the wedge-shaped part 31 pushes the inclined slider to move horizontally and abuts against the inclined surface of the slot 21. When the sleeve 1 stops moving upward, under the action of the unloading spring 7, the unloading plate and sleeve 1 tend to move downward; however, under the action of the frictional force of the self-locking angle contact surface between the sliding sleeve 2, the wedge-shaped part 31, and the inclined slider, as well as the action of the locking spring 5, the frictional force between the inclined slider and the inclined contact surface of the inclined slider sleeve can prevent the unloading plate and sleeve 1 from moving downward, thus completing the self-locking. This ensures that the sheared punch and the upper unloading plate 102 are pushed into the upper mold cavity 101 of the upper mold 10 by the lower mold 20 and will not fall off. Since the punch is completely pressed and located in the upper mold cavity 101, the shearing deformation of the punch can be effectively controlled.

[0074] After the blanking is completed, the upper die 10 moves upward and the robot arm 50 extends into the gap between the upper die 10 and the lower die 20 to reach the receiving position;

[0075] When the worktable on the punch press rises to the upper stop point, the ejector mechanism begins to eject material downwards, applying force to the ejector plate 40, causing the ejector plate 40 to contact the top of the transmission rod 33, and continuing to apply force downwards. After being subjected to force, the upper unloading plate 102 pushes the punch sheet downwards out of the upper mold cavity 101. Specifically, under the action of the ejector mechanism, the ejector plate 40 pushes the wedge-shaped part 31 to compress the locking spring 5 and move downwards. At this time, a gap will appear between the wedge-shaped part 31 and the inclined slide. Under the action of the unloading spring 7, the unloading plate and the sleeve 1 begin to move downwards. At the same time, the sleeve 1 drives the inclined slide to move downwards as well. During the movement, the inclined surface of the slot 21 pushes the inclined slide to move horizontally and abuts against the inclined surface of the wedge-shaped part 31. When the wedge 31 stops moving downwards (unloading is completed and the ejector plate 40 returns to its original position), the locking mechanism also completes self-locking under the action of the locking spring 5; the punch detaches from the upper mold cavity 101 and falls onto the robot arm 50, and the punch exits the mold with the robot arm 50 to complete the receiving.

[0076] Compared to existing technologies, the upper unloading plate is initially located inside the upper mold cavity. In the initial state, the unloading spring 7 of this device will be positioned relative to the upper unloading plate 102, causing the bottom of the upper unloading plate 102 to protrude from the upper mold cavity 101, effectively pressing the material during punching. During punching, the protruding upper unloading plate 102 can press the sheet metal tightly against the surface of the lower unloading mechanism. Because the sheet metal is pressed, the shearing deformation of the punch is controlled during punching. During the punching and shearing process, the upper unloading plate 102 of this invention will always press the punch metal tightly against the surface of the lower unloading mechanism.

[0077] After the blanking is completed, at the instant the upper stripper plate 102 stops moving upward (when the upper die 10 starts to move upward and the surface of the lower die 20 separates from the surface of the blank), the locking mechanism completes self-locking; the locking mechanism restricts the stripper spring 7 and the upper stripper plate 102 from pushing the blank out of the upper die cavity 101.

[0078] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A stripper locking mechanism mounted on a punch and connected with an upper stripper, characterized in that, The punch die upper stripper locking mechanism comprises a sleeve, a slide sleeve sleeved outside the sleeve, a wedge-shaped piece sleeved inside the sleeve and moving vertically, a slider assembly slidingly installed on the sleeve and slidingly matched with the wedge-shaped piece, a locking spring sleeved inside the sleeve and located at the bottom of the wedge-shaped piece and abutting against the wedge-shaped piece, a screw plug installed at the top of the sleeve, and a stripper spring sleeved inside the sleeve and located between the upper die and the upper stripper plate; one end of the wedge-shaped piece penetrates the screw plug; in the initial state, the stripper spring and the locking spring are in the pre-compressed state; the upper stripper plate is located in the upper die cavity in the initial state, and the stripper spring will exert a force on the upper stripper plate so that the bottom of the upper stripper plate will protrude out of the upper die cavity; during the punching and shearing process, the upper stripper plate will always press the punched sheet against the surface of the lower stripper mechanism; After the punching is completed, the locking mechanism is self-locked at the moment when the upward movement of the upper stripper plate stops; the locking mechanism limits the stripper spring and the upper stripper plate to push the punched sheet out of the upper die cavity.

2. The stripper plate locking mechanism of claim 1 wherein, The wedge-shaped piece comprises a wedge-shaped part in trapezoidal structure and sleeved inside the sleeve, and a transmission rod with one end penetrating the screw plug and the other end connected with the wedge-shaped part; the small end of the wedge-shaped part is connected with one end of the transmission rod.

3. A stripper plate locking mechanism for a die as defined in claim 2 wherein, The slider assembly is two groups and is uniformly arranged along the circumference of the sleeve; an installation groove in communication with the inside of the sleeve is arranged on the sleeve, a clamping groove in cooperation with the installation groove and forming an installation cavity is arranged on the inside surface of the slide sleeve, and the clamping groove and the installation groove are arranged one by one; the slider assembly is installed in the installation cavity.

4. The stripper plate locking mechanism of claim 2 wherein, A limiting block is arranged at the top of the wedge-shaped part; a through hole is arranged on the screw plug for the transmission rod to penetrate; the limiting block is located between the screw plug and the slider assembly, and the outer diameter of the limiting block is greater than the diameter of the through hole.

5. The stripper plate locking mechanism of claim 3 wherein, The slider assembly is an inclined slider, the inside of the slider assembly is provided with an inclined surface matched with the outside surface of the wedge-shaped part; the outside surface of the slider assembly is arranged in an inclined surface, and the bottom surface of the clamping groove is arranged in an inclination and slidingly matched with the outside surface of the slider assembly.

6. The stripper plate locking mechanism of claim 3 wherein, The vertical depth of the clamping groove is greater than the vertical length of the slider assembly.

7. A die tool characterized in that, The punch die upper stripper locking mechanism comprises an upper die provided with an upper die cavity at the bottom, an upper stripper plate located in the upper die cavity, the punch die upper stripper locking mechanism installed on the upper die and connected with the upper stripper plate at the bottom as claimed in any one of claims 1-6, and a stripping plate matched with the top of the punch die upper stripper locking mechanism; the top of the wedge-shaped piece penetrates the upper die and is matched with the stripping plate.

8. A die set as claimed in claim 7, wherein, The top of the upper die is provided with a groove A for installing the slide sleeve, a groove B coaxially communicated with the groove A and used for the sleeve, and a groove C coaxially communicated with the groove B and arranged at the bottom of the upper die; the stripper spring is installed in the groove C; the groove C is communicated with the upper die cavity; the diameter of the groove A is greater than the diameter of the groove B.

9. A die set as defined in claim 7, wherein, The lower stripper mechanism located directly below the upper die and the stripping mechanism in transmission connection with the stripping plate are further included.

10. A die set as claimed in claim 9, wherein, The lower stripper mechanism comprises a lower die and a lower stripper plate elastically connected with the lower die.

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