An upper die unit

Abstract

This application discloses an upper die unit, including a first upper die module and a second upper die module. A first punch of the first upper die module is connected below a first template group. The second upper die module is located below the first template group and has a through-hole for avoiding the first punch. Vent holes are spaced apart on the wall of the vent hole, extending along the depth direction of the vent hole. An elastic component provides an elastic force that causes the first template group and the second upper die module to move away from each other, allowing the lower end face of the first punch to retract into the vent hole and be higher than the lower end face of the upper die. When the upper die abuts against the lower die unit, the first upper die module can continuously press down under external force, causing the lower end face of the first punch to extend beyond the lower end face of the upper die to punch the material strip. This upper die unit can expel gas below the first punch, reducing surface defects in the product.

Description

Technical Field

[0001] This application relates to the field of stamping equipment technology, and in particular to an upper die unit. Background Technology

[0002] In related technologies, when stamping strip, the upper and lower die units of a stamping press close to complete the stamping process. The upper die unit of the stamping press typically includes a first upper die module and a second upper die module distributed vertically. An elastic component connects the first and second upper die modules. The first upper die module has a punch at its bottom, and the second upper die module has a clearance hole that accommodates the punch and is sized to fit the punch. During stamping, the punch passes through the clearance hole to stamp the strip. However, during the die closing process, because there is a closed cavity between the punch, the clearance hole wall, and the strip, deformation of the strip is easily caused during the forming process, affecting the flatness of the stamped product and resulting in stamping defects. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes an upper die unit that can expel gas below the first punch, reducing the phenomenon of surface defects in the product.

[0004] According to an embodiment of the present invention, an upper die unit includes: a first upper die module and a second upper die module. The first upper die module includes a first template group, an elastic component, and a first punch, the first punch being connected below the first template group. The second upper die module is disposed below the first template group and includes an upper die member. The upper die member has a through-hole, the through-hole being provided corresponding to the first punch for avoiding the first punch. The wall of the through-hole is provided with vent holes at intervals, the vent holes extending along the depth direction of the through-hole and used to discharge gas between the lower end face of the first punch, the wall of the through-hole, and the material strip during the forming process. The elastic component is used to provide an elastic force that causes the first template group and the second upper die module to move away from each other, so that the lower end face of the first punch can retract into the through-hole to be higher than the lower end face of the upper die member. When the upper die member abuts against the lower die unit, the first upper die module can deform the elastic component under the continuous downward pressure of the external force, and cause the lower end face of the first punch to extend out of the lower end face of the upper die member to punch the material strip.

[0005] According to an embodiment of the present invention, an upper die unit has at least the following beneficial effects: This upper die unit includes a first upper die module and a second upper die module distributed vertically. The first upper die module includes a first template group and a first punch disposed below the first template group. The upper die component of the second upper die module is provided with a clearance hole to avoid the first punch. An elastic component connects the first template group and the upper die component. In use, the elastic component has an elastic force that causes the first template group and the second upper die module to move away from each other. Therefore, the lower end face of the first punch can be located inside the upper die component. During the stamping process, the upper die unit is pressed down under the action of external force until the second upper die module abuts against the lower die unit. The first upper die module can continue to be pressed down under the action of external force to allow the elastic component to... During the deformation of the workpiece, the first punch can descend relative to the upper die, forming a cavity between the first punch, the wall of the clearance hole in the upper die, and the strip. As the first punch continues to descend relative to the upper die, the gas in the cavity can be discharged along the vent hole on the wall of the clearance hole, thus preventing the product surface from deforming due to the gas in the cavity during the stamping process. After stamping, during the upward movement of the upper die unit, the first upper die module moves upward relative to the second upper die module. Therefore, the first punch can move upward relative to the upper die, and the lower end face of the first punch is higher than the lower end face of the upper die, thus preventing the strip from sticking to the first punch. In summary, the upper die unit of this application can promptly discharge the gas below the first punch, reducing the phenomenon of product surface defects.

[0006] According to some embodiments of the present invention, the wall of the clearance hole has a certain slope, the inner dimension of the upper part of the clearance hole is larger than the inner dimension of the lower part of the clearance hole, and the inner dimension of the bottom of the clearance hole is adapted to the outer dimension of the first punch.

[0007] According to some embodiments of the present invention, the clearance hole includes a tapered hole and a straight hole connected to the lower part of the tapered hole. The inner size of the tapered hole gradually decreases from top to bottom, and the inner size of the straight hole is the same as the inner size of the bottom of the tapered hole and is adapted to the outer size of the first punch.

[0008] According to some embodiments of the present invention, the first upper mold module further includes a first locking component. The middle of both sides of the first punch is provided with a positioning groove. The upper groove wall and the lower groove wall of the positioning groove form an upper abutment part and a lower abutment part, respectively. The first locking component is locked to the bottom of the first template group and is partially located in the positioning groove for positioning the first punch.

[0009] According to some embodiments of the present invention, the first locking assembly includes a gasket and a first locking member, the first locking member passing through the gasket and being height-adjustably locked to the first template group, and the second upper mold module is provided with an avoidance groove to avoid the first locking assembly.

[0010] According to some embodiments of the present invention, the elastic component includes a first elastic member and a first limiting member. The first template group is provided with a receiving hole and a through hole. The through hole communicates with the lower part of the receiving hole and penetrates the bottom of the first template group. The upper part of the first limiting member is provided with an outer flange. The outer dimension of the outer flange is larger than the outer dimension of the lower part of the first limiting member and the diameter of the through hole. The lower part of the first limiting member passes through the through hole. The first elastic member and the outer flange are limited in the receiving hole. The height of the lower part of the first limiting member is greater than the depth of the through hole. The upper and lower ends of the first elastic member are respectively connected between the first template group and the first limiting member, and are used to provide elastic force to make the first limiting member extend out of the through hole.

[0011] According to some embodiments of the present invention, the second upper mold module further includes a second template group, and the upper mold component is embedded in the second template group.

[0012] According to some embodiments of the present invention, it further includes an anti-detachment connecting assembly, which is arranged in pairs and symmetrically on the side of the upper mold unit. The anti-detachment connecting assembly includes a second locking member and a U-shaped member. The opening of the U-shaped member is horizontally facing the upper mold unit. The second locking member locks the first template group and the U-shaped member. The bottom of the side of the first template group is provided with a first protrusion, and the upper part of the side of the second template group is provided with a second protrusion. The first protrusion and the second protrusion are both limited to the two side plates of the U-shaped member to limit the distance that the second template group moves relative to the first template group, so as to prevent the first punch from detaching from the upper mold unit.

[0013] According to some embodiments of the present invention, the first upper mold module further includes a plurality of punches, which extend out of the bottom of the first template group and are used to punch out the positioning holes of the strip and / or the product holes of the product. The second template group is provided with through guide holes for the punches to pass through.

[0014] According to some embodiments of the present invention, a guide structure is also included, which penetrates through the second template group and is fixed to the second template group, and the two ends of the guide structure are respectively movably limited to the first template group and the lower die unit of the stamping machine. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the overall structure of a stamping press in one embodiment of the present invention, in which the upper die unit is located; Figure 2 for Figure 1 A cross-sectional view of the upper mold unit shown; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 2 A schematic diagram of the structure of the first punch in the upper die unit shown; Figure 5 for Figure 1 A schematic diagram of the structure of the upper mold component in the upper mold unit shown; Figure 6 for Figure 1 The image shows a cross-sectional view of the press where the upper die unit is located.

[0016] Figure label: First upper mold module 100; First template group 110; Receiving hole 111; Through hole 112; First protrusion 113; Elastic component 120; First elastic element 121; First limiting element 122; First punch 130; Positioning groove 131; First locking component 140; Gasket 141; First locking element 142; Punch 150; Second upper mold module 200; Upper mold part 210; Clearance hole 211; Tapered hole 2111; Straight hole 2112; Vent hole 212; Second template group 220; Clearance groove 221; Second protrusion 222; Anti-detachment connection component 300; Second locking element 310; U-shaped part 320; Guide structure 400; Material strip 1000; Upper mold unit 2000; Lower mold unit 3000. Detailed Implementation

[0017] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0018] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0021] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] The following is for reference. Figures 1 to 6 An upper mold unit 2000 according to an embodiment of the present invention is described.

[0023] like Figures 1 to 5 As shown, according to an embodiment of the present invention, an upper mold unit 2000 includes: a first upper mold module 100 and a second upper mold module 200. The first upper mold module 100 includes a first template group 110, an elastic component 120, and a first punch 130, the first punch 130 being connected below the first template group 110. The second upper mold module 200 is disposed below the first template group 110 and includes an upper mold member 210. The upper mold member 210 has a through-hole 211, the through-hole 211 being provided corresponding to the first punch 130 to avoid the first punch 130. The wall of the through-hole 211 is provided with vent holes 212 spaced apart, the vent holes 212 being along the through-hole 211. Extending in the depth direction, it is used to expel gas between the lower end face of the first punch 130, the wall of the clearance hole 211, and the strip 1000 during the forming process; wherein, the elastic component 120 is used to provide an elastic force that causes the first template group 110 and the second upper die module 200 to move away from each other, so that the lower end face of the first punch 130 can retract into the clearance hole 211 and be higher than the lower end face of the upper die 210; when the upper die 210 abuts against the lower die unit 3000, the first upper die module 100 can deform the elastic component 120 under the continuous downward pressure of the external force, and cause the lower end face of the first punch 130 to extend out of the lower end face of the upper die 210 to punch the strip 1000.

[0024] It is understood that this upper die unit 2000 includes a first upper die module 100 and a second upper die module 200 distributed vertically. The first upper die module 100 includes a first template group 110 and a first punch 130 located below the first template group 110. The upper die component 210 of the second upper die module 200 is provided with a clearance hole 211 to avoid the first punch 130. An elastic component 120 connects the first template group 110 and the upper die component 210. In use, the elastic component 120 has an elastic force that moves the first template group 110 and the second upper die module 200 away from each other. Therefore, the lower end face of the first punch 130 can be located inside the upper die component 210. During the stamping process, the upper die unit 2000 is pressed down under the action of external force until the second upper die module 200 abuts against the lower die unit 3000. The first upper die module 100 can continue to be pressed down under the action of external force to deform the elastic component 120. The first punch 130 can descend relative to the upper die 210, and a cavity is formed between the first punch 130, the wall of the clearance hole 211 of the upper die 210, and the strip 1000. During the continuous descent of the first punch 130 relative to the upper die 210, the gas in the cavity can be discharged along the vent hole 212 on the wall of the clearance hole 211, thereby avoiding product surface deformation caused by the gas in the cavity during the stamping process of the strip 1000. During the upward movement of the upper die unit 2000 after stamping, the first upper die module 100 moves upward relative to the second upper die module 200. Therefore, the first punch 130 can move upward relative to the upper die 210, and the lower end face of the first punch 130 is higher than the lower end face of the upper die 210, thereby preventing the strip 1000 from sticking to the first punch 130. In summary, the upper die unit 2000 of this application can timely discharge the gas below the first punch 130, reducing the phenomenon of product surface defects.

[0025] It is understandable that the wall of the clearance hole 211 has a certain slope, the inner dimension of the upper part of the clearance hole 211 is larger than the inner dimension of the lower part of the clearance hole 211, and the inner dimension of the bottom of the clearance hole 211 is adapted to the outer dimension of the first punch 130. For example, Figure 5 As shown, in this embodiment, the wall of the clearance hole 211 of the upper mold 210 has a certain slope, and the inner dimension of the upper part is larger than the inner dimension of the lower part. The inner dimension of the bottom of the clearance hole 211 is adapted to the outer dimension of the first punch 130. Therefore, the upper mold 210 can ensure the guiding function of the first punch 130, while the slope can reduce the contact friction surface, thereby reducing wear and improving service life.

[0026] It is understood that the clearance hole 211 includes a tapered hole 2111 and a straight hole 2112 connected to the lower part of the tapered hole 2111. The inner dimension of the tapered hole 2111 gradually decreases from top to bottom, and the inner dimension of the straight hole 2112 is the same as the inner dimension of the bottom of the tapered hole 2111, and is adapted to the outer dimension of the first punch 130. For example, Figure 5 As shown, in this embodiment, the clearance hole 211 includes an upper tapered hole 2111 and a straight hole 2112 connected to the lower part of the tapered hole 2111. Therefore, the straight hole 2112 can guide the first punch 130, thereby improving the alignment of the punch with the material strip 1000 to form the product, which facilitates further processing of the product. The tapered hole 2111 can reduce friction and expel air as soon as possible, further reducing the shape defects of the product punched from the material strip 1000.

[0027] It is understood that the first upper mold module 100 also includes a first locking assembly 140. Positioning grooves 131 are provided in the middle of both sides of the first punch 130. The upper and lower walls of the positioning grooves 131 form an upper abutment portion and a lower abutment portion, respectively. The first locking assembly 140 is locked to the bottom of the first template group 110 and partially located within the positioning grooves 131 for positioning the first punch 130. For example, Figures 2 to 3 As shown, in this embodiment, a positioning groove 131 is provided in the middle of both sides of the first punch 130. The first upper mold module 100 also includes a first locking component 140. The first locking component 140 connects the first punch 130 and the first template group 110. A part of the first locking component 140 is located in the positioning groove 131 and can abut against the upper and lower groove walls of the positioning groove 131 to limit the stroke of the first punch 130 moving up and down.

[0028] It is understood that the first locking assembly 140 includes a washer 141 and a first locking member 142. The first locking member 142 passes through the washer 141 and is height-adjustably locked to the first template assembly 110. The second upper mold module 200 is provided with a clearance groove 221 to avoid the first locking assembly 140. For example, Figures 2 to 3 As shown, in this embodiment, the first locking assembly 140 includes a gasket 141 and a first locking member 142. The first locking member 142 passes through the gasket 141 and is connected to the bottom of the first template group 110. By setting the gasket 141 in the positioning grooves 131 on both sides of the first punch 130, the lower part of the first punch 130 can be prevented from shifting in the horizontal direction. Then, the first locking member 142 locks and fixes it, thereby achieving the limitation of the first punch 130 in the horizontal direction and the limitation in the vertical direction. The height of the first locking member 142 can be adjusted, so as to adapt to the first punch 130 of different specifications and the strip 1000 with different stamping height requirements.

[0029] It is understood that the elastic component 120 includes a first elastic member 121 and a first limiting member 122. The first template group 110 is provided with a receiving hole 111 and a through hole 112. The through hole 112 communicates with the lower part of the receiving hole 111 and penetrates the bottom of the first template group 110. The upper part of the first limiting member 122 is provided with an outer flange. The outer dimension of the outer flange is larger than the outer dimension of the lower part of the first limiting member 122 and the diameter of the through hole 112. The lower part of the first limiting member 122 passes through the through hole 112. The first elastic member 121 and the outer flange are limited in the receiving hole 111. The height of the lower part of the first limiting member 122 is greater than the depth of the through hole 112. The upper and lower ends of the first elastic member 121 are respectively connected between the first template group 110 and the first limiting member 122, and are used to provide elastic force for the first limiting member 122 to extend out of the through hole 112. For example, Figure 2 As shown, in this embodiment, the first elastic member 121 and the first limiting member 122 of the elastic component 120 are vertically distributed on the first template group 110, and the first template group 110 is provided with a receiving hole 111 and a through hole 112 distributed vertically. The inner diameter of the through hole 112 is smaller than that of the receiving hole 111. Therefore, the upper flange of the first limiting member 122 is limited to the receiving hole 111, and the lower part of the first limiting member 122 passes through the through hole 112. The first elastic member 121 located in the receiving hole 111 is used to provide elastic force to make the first limiting member 122 move downward, so that the bottom of the first limiting member 122 can abut against the second upper die unit 2000 away from the first upper die unit 2000, so that the lower end face of the first punch 130 can retract into the first punch 130.

[0030] It is understood that the second upper mold module 200 also includes a second template group 220, and the upper mold component 210 is embedded in the second template group 220. For example, Figures 2 to 6 As shown, in this embodiment, the second upper mold module 200 further includes a second template group 220, the elastic component 120 is disposed between the first template group 110 and the second template group 220, the upper mold part 210 is embedded in the second template group 220, and the upper mold part 210 is detachably connected to the second template group 220, so that upper mold parts 210 of different specifications and shapes can be replaced, thereby adapting to different stamping processing requirements.

[0031] It is understood that the system also includes anti-detachment connecting components 300. These anti-detachment connecting components 300 are arranged in pairs and symmetrically on the sides of the upper mold unit 2000. Each anti-detachment connecting component 300 includes a second locking member 310 and a U-shaped member 320. The opening of the U-shaped member 320 is horizontally oriented towards the upper mold unit 2000. The second locking member 310 locks the first template group 110 and the U-shaped member 320 together. The bottom of the side of the first template group 110 has a first protrusion 113, and the upper part of the side of the second template group 220 has a second protrusion 222. Both the first protrusion 113 and the second protrusion 222 are confined between the two side plates of the U-shaped member 320 to limit the distance the second template group 220 can move relative to the first template group 110, thereby preventing the first punch 130 from detaching from the upper mold unit 210. For example, Figure 6 As shown, in this embodiment, the first template group 110 and the second template group 220 are connected by anti-detachment connectors to prevent them from detaching from each other. The anti-detachment connectors are arranged in pairs on the outside of the upper mold module. The anti-detachment connectors include a U-shaped member 320 with an opening horizontally facing the upper mold unit 2000, and a second locking member 310 for locking the U-shaped member 320 and the first template group 110. The bottom of the outer side of the first template group 110 is provided with a first protrusion 113, and the upper part of the outer side of the second template group 220 is provided with a second protrusion 222. The two sides of the U-shaped member 320 are respectively located above the first protrusion 113 and below the second protrusion 222, thereby limiting the distance between the first template group 110 and the second template group 220, so as to limit the detachment of the first upper mold module 100 and the second upper mold module 200, thereby ensuring that the lower end of the first punch 130 is always inserted into the clearance hole 211 of the upper mold member 210.

[0032] Understandably, the first upper mold module 100 also includes a plurality of punches 150, which extend from the bottom of the first template group 110 and are used to punch out positioning holes for the strip 1000 and / or product holes for the product. The second template group 220 is provided with through guide holes for the punches 150 to pass through. For example, Figure 6 As shown, in this embodiment, the first upper mold module 100 also includes a punch 150 that passes through the second template group 220. The punch 150 can punch out product holes or positioning holes on the material strip 1000 so that it can be punched in subsequent processing. Specifically, the punch 150 and the first punch 130 are arranged in the first template group 110 along the material feeding direction of the material strip 1000.

[0033] Understandably, it also includes a guide structure 400, which penetrates and is fixed to the second template group 220. The two ends of the guide structure 400 are respectively movably limited to the first template group 110 and the lower die unit 3000 of the stamping machine. For example, Figure 6As shown, in this embodiment, the guide structure 400 enables the upper die unit 2000 and the lower die unit 3000 to always be aligned in the vertical direction, thereby improving the stamping quality.

[0034] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. An upper mold unit, characterized in that, include: The first upper die module includes a first template group, an elastic component, and a first punch, with the first punch connected below the first template group; The second upper die module is located below the first die assembly and includes an upper die component. The upper die component has a through-hole, which is positioned to avoid the first punch. The wall of the through-hole is provided with vent holes at intervals. These vent holes extend along the depth of the through-hole and are used to discharge gas from the lower end face of the first punch, the wall of the through-hole, and the material strip. The elastic component is used to provide an elastic force that causes the first template group and the second upper die module to move away from each other, so that the lower end face of the first punch can retract into the clearance hole and be higher than the lower end face of the upper die; when the upper die abuts against the lower die unit, the first upper die module can be continuously pressed down under the action of external force to deform the elastic component and cause the lower end face of the first punch to extend out of the lower end face of the upper die to punch the strip.

2. The upper mold unit according to claim 1, characterized in that, The wall of the clearance hole has a certain slope, the inner dimension of the upper part of the clearance hole is larger than the inner dimension of the lower part of the clearance hole, and the inner dimension of the bottom of the clearance hole is adapted to the outer dimension of the first punch.

3. The upper mold unit according to claim 2, characterized in that, The clearance hole includes a tapered hole and a straight hole connected to the lower part of the tapered hole. The inner dimension of the tapered hole gradually decreases from top to bottom. The inner dimension of the straight hole is the same as the inner dimension of the bottom of the tapered hole and is adapted to the outer dimension of the first punch.

4. The upper mold unit according to claim 1, characterized in that, The first upper die module also includes a first locking component. Positioning grooves are provided in the middle of both sides of the first punch. The upper and lower groove walls of the positioning grooves form an upper abutment and a lower abutment, respectively. The first locking component is locked to the bottom of the first template group and is partially located in the positioning groove for positioning the first punch.

5. The upper mold unit according to claim 4, characterized in that, The first locking assembly includes a gasket and a first locking member. The first locking member passes through the gasket and is height-adjustably locked to the first template group. The second upper mold module is provided with a clearance groove to avoid the first locking assembly.

6. The upper mold unit according to claim 1, characterized in that, The elastic component includes a first elastic member and a first limiting member. The first template group has a receiving hole and a through hole. The through hole communicates with the lower part of the receiving hole and penetrates the bottom of the first template group. The upper part of the first limiting member has an outer flange. The outer dimension of the outer flange is larger than the outer dimension of the lower part of the first limiting member and the diameter of the through hole. The lower part of the first limiting member passes through the through hole. The first elastic member and the outer flange are limited in the receiving hole. The height of the lower part of the first limiting member is greater than the depth of the through hole. The upper and lower ends of the first elastic member are respectively connected between the first template group and the first limiting member, and are used to provide elastic force to make the first limiting member extend out of the through hole.

7. The upper mold unit according to claim 1, characterized in that, The second upper mold module also includes a second template group, and the upper mold component is embedded in the second template group.

8. The upper mold unit according to claim 7, characterized in that, It also includes anti-detachment connecting components, which are arranged in pairs and symmetrically on the side of the upper mold unit. Each anti-detachment connecting component includes a second locking member and a U-shaped member. The opening of the U-shaped member is horizontally facing the upper mold unit. The second locking member locks the first template group and the U-shaped member. The bottom of the side of the first template group is provided with a first protrusion, and the upper part of the side of the second template group is provided with a second protrusion. Both the first protrusion and the second protrusion are located between the two side plates of the U-shaped member to limit the distance that the second template group can move relative to the first template group, so as to prevent the first punch from detaching from the upper mold unit.

9. The upper mold unit according to claim 7, characterized in that, The first upper mold module also includes several punches, which extend out of the bottom of the first template group and are used to punch out the positioning holes of the material strip and / or the product holes of the product. The second template group is provided with through guide holes for the punches to pass through.

10. The upper mold unit according to claim 7, characterized in that, It also includes a guide structure that passes through the second template group and is fixed to the second template group. The two ends of the guide structure are respectively movably limited to the first template group and the lower die unit of the stamping machine.

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