A drawing die with a puncture structure

Abstract

The present invention discloses a drawing die with a puncturing structure, comprising an upper drawing die and a lower drawing die, wherein two puncturing modules are arranged on the upper drawing die, and two avoidance modules are integrally formed on the lower drawing die, the puncturing module comprising a mounting platform and a puncturing structure, the puncturing structure is located directly above the puncturing area of ​​the sheet material, the avoidance module comprises a knife groove for accommodating the puncturing structure, the puncturing structure comprises a puncturing body, a puncturing blade located at a lower edge of the puncturing body, a pre-pressing fillet located at another lower edge of the puncturing body, and a pressing surface for transitionally connecting the puncturing blade and the pre-pressing fillet, the puncturing area comprises a pressing puncturing area and a non-pressing puncturing area, the pre-pressing fillet corresponding to the pressing puncturing area is located at the front end of the puncturing blade, and the angle a between the pressing surface and the horizontal plane is less than 30 degrees; by arranging the pre-pressing fillet and the pressing surface on the puncturing body of the drawing die, the pre-pressing and inclination adjustment of the sheet material are realized, the debris generated by the puncturing of the puncturing blade is reduced to a certain extent, and the molding quality of the part is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile drawing dies, in particular to a drawing die with a puncture structure. Background Art

[0002] During the drawing process of automobile covering parts, it is necessary to actively puncture the corresponding process supplement area on the sheet material to facilitate the flow and drawing of the sheet material and reduce the cracking phenomenon of the sheet material product. The puncture structure 900 of the existing technology is as follows: Figure 8 As shown, most of them are pointed single-edged structures. When the drawn plate has an inclination, especially when the inclination exceeds 30°, the puncturing knife in the prior art is likely to produce plate debris during puncture. The plate debris rolls along the inclined surface of the inclined plate to the forming surface of the plate and the molded surface of the mold, affecting the forming quality of the drawing process. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a drawing die with a puncture structure to solve the problems raised in the above background technology.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A drawing die with a puncture structure comprises an upper drawing die and a lower drawing die, the upper drawing die is provided with an upper drawing profile, the upper drawing profile is an inclined die surface, the lower drawing die is provided with a lower drawing profile that can be molded with the upper drawing profile, and further comprises: two puncture modules detachably arranged on the upper drawing die and two avoidance modules integrally formed on the lower drawing die, the puncture module comprises a mounting platform and a puncture structure, the lower end surface of the mounting platform is a puncture base surface adapted to the upper drawing profile, the mounting platform is detachably connected to the upper drawing die, the puncture structure is raised by the puncture base surface, and is located directly above the puncture area of ​​the sheet material, the avoidance module comprises a mounting platform and a puncture structure, the lower end surface of the mounting platform is a puncture base surface adapted to the upper drawing profile, the mounting platform is detachably connected to the upper drawing die, the puncture structure is raised by the puncture base surface, and is located directly above the puncture area of ​​the sheet material, and the avoidance module comprises a mounting platform and a puncture structure, The knife groove is adapted to accommodate the puncturing structure. The puncturing structure includes a puncturing body, a puncturing blade located at a lower edge of the puncturing body, a pre-pressed fillet located at another lower edge of the puncturing body, and a pressing surface that transitionally connects the puncturing blade and the pre-pressed fillet. The puncturing area includes a pressing puncturing area and a non-pressing puncturing area. The pre-pressed fillet corresponding to the pressing puncturing area is located at the front end of the puncturing blade so as to contact and press down the sheet material in the inclined puncturing area before the puncturing blade, and the pressing surface corresponding to the pressing puncturing area forms an angle a with the horizontal plane, 0≤a<30°, and the puncturing blade corresponding to the non-pressing puncturing area is located at the front end of the pre-pressed fillet.

[0006] Preferably, the blade profile of the puncturing blade is a semi-enclosed and continuously smoothly transitioned combined profile, which includes a lower transition blade area, a front end puncturing blade area and an upper transition blade area from the lower end to the upper end. The front end puncturing blade area is located on one side of the puncturing area, and the upper transition blade area and the lower transition blade area are transitionally connected to the front end puncturing blade area. Both have an arc-shaped structure and extend to the other side of the puncturing area. The upper transition blade area and the lower transition blade area are lower than the front end puncturing blade area, and their heights gradually decrease as they move away from the front end puncturing blade area. The puncturing area is located in the enclosed area of ​​the puncturing blade, the puncturing blade is located at the outer lower edge of the puncturing body, the pre-pressed fillet is located at the inner lower edge of the puncturing body, and the circumferential path of the pre-pressed fillet is adapted to the puncturing blade profile.

[0007] More preferably, the blade line of the front piercing blade area is a straight line, which is parallel to the inclined mold surface and inclined relative to the extension direction of the inclined mold surface. The piercing area corresponding to the front piercing blade area and the lower transition blade area is the material pressing piercing area.

[0008] Further preferably, the blade line of the puncturing blade extends to both ends to form an upper terminal blade area and a lower terminal blade area, the upper terminal blade area and the lower terminal blade area are located on the other side of the puncturing area, and are both straight lines. The two are symmetrical and arranged in an "eight" shape relative to the inward extension of the puncturing area. The upper terminal blade area is smoothly connected to the upper transition blade area and the puncturing base surface, and the lower terminal blade area is smoothly connected to the lower transition blade area and the puncturing base surface, and the upper terminal blade area and the arc shape of the blade line of the lower terminal blade area are correspondingly arranged above the pressing material puncturing area, and the lower terminal blade is correspondingly arranged above the pressing material puncturing area.

[0009] Further preferably, the upper transition blade area has a first transposition section and a second transposition section near both ends, and the lower transition blade area has a third transposition section. The first transposition section, the second transposition section and the third transposition section are all horizontal cross-sections. The first transposition section and the second transposition section are respectively perpendicular to the blade line of the upper transition blade area intersecting with them, and the third transposition section is perpendicular to the blade line of the lower transition blade area intersecting with it. The first transposition section and the second transposition section divide the upper transition blade area into two transition end blade areas and a middle blade area, and the third transposition section divides the lower transition blade area into a front transition blade area and a tail transition blade area. The two transition end blade areas and the front transition blade area correspond to the material pressing and puncturing areas, and the middle blade area and the tail transition blade area correspond to the non-material pressing and puncturing areas.

[0010] Further preferably, the pressing surface that is transitionally connected to the front piercing blade area, the lower transition blade area, the lower terminal blade, the two transition end blade areas and the front transition blade area is a horizontal plane, that is, a=0°.

[0011] Further preferably, the knife groove surrounds along a closed loop path, and a chip removal hole is provided at the bottom of the groove, which is connected to the chip suction system. There are at least two chip removal holes, at least one chip removal hole is located on the lower side of the puncture area, and at least one chip removal hole is located on the other lower side of the puncture area.

[0012] Further preferably, the outer groove edge of the knife groove is a rounded surface, and the puncturing blade is a right-angled blade, which cooperates with the puncturing blade to achieve puncturing of the middle plate.

[0013] Further preferably, the gap between the outer groove side surface of the knife groove and the puncturing blade is 0.2 mm.

[0014] Further preferably, the mounting platform has a right-angled trapezoidal structure, the lower end face of which is a puncture base surface adapted to the upper drawing profile, and the upper end face of which is a horizontal surface. Two positioning pin holes are vertically provided on the mounting platform, and the two positioning pin holes are arranged on the upper and lower sides of the inner side of the puncture body. Several connecting screw holes are also vertically provided on the mounting platform for connecting the mounting platform to the upper drawing die.

[0015] Compared with the prior art, the drawing die with a puncturing structure of the present invention includes a puncturing module and an avoidance module. The puncturing body of the puncturing module is provided with a pre-pressing radius and a pressing surface to press and puncture part of the puncturing area of ​​the sheet material. The sheet material with excessive inclination is pre-pressed by the pre-pressing radius, and the inclination is adjusted by the pressing surface, which reduces the debris generated by the puncturing blade to a certain extent, effectively improves the forming quality of the workpiece, and also prevents the debris from rolling down along the inclined sheet material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of the upper drawing die of the present invention;

[0017] Figure 2 It is a three-dimensional structural diagram of the lower drawing die of the present invention;

[0018] Figure 3 for Figure 1 A three-dimensional structural diagram of the puncture module;

[0019] Figure 4 for Figure 1 The main view of the puncture module in;

[0020] Figure 5 for Figure 4 A front view of the puncture structure;

[0021] Figure 6 for Figure 2 The front view of the avoidance module in ;

[0022] Figure 7 This is a schematic diagram of the puncture principle of the puncture structure of the present invention;

[0023] Figure 8 The figure is a simplified diagram of the puncture principle of the existing puncture structure.

[0024] In the figure: 000, sheet; 100, upper drawing die; 200, upper drawing profile; 300, piercing module; 310, mounting platform; 320, piercing structure; 320a, piercing blade; 320b, pre-pressed fillet; 320c, pressing surface; 320d, piercing body; 321, front piercing blade area; 322, lower transition blade area; 323, lower end blade area; 324, upper transition blade area; 325, upper End cutting edge area; 326, first transposition section; 326, second transposition section; 327, third transposition section; 330, connecting screw hole; 340, positioning pin hole; 400, elastic retraction mechanism; 500, lower drawing die; 600, avoidance module; 610, knife groove; 620, outer groove side; 621, outer groove edge; 700, lower drawing profile; 800, chip removal hole; 900, existing puncture structure. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only the best embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] like Figure 1-Figure 2 A drawing die with a puncture structure shown in FIG, comprises an upper drawing die 100 and a lower drawing die 500, the upper drawing die 100 is provided with an upper drawing profile 200 adapted to the workpiece structure, the upper drawing profile 200 is an inclined die surface, and an inclination angle greater than 30° with the horizontal plane, the upper drawing die 100 is provided with a plurality of elastic retraction mechanisms 400 evenly distributed on the outside of the upper drawing profile 200, the lower drawing die 500 is provided with a lower drawing profile 700 molded with the upper drawing profile 200, in order to puncture the process supplement area and avoid cracking of the sheet material during drawing, two puncture modules 300 are detachably provided on the upper drawing die 100, and two avoidance modules 600 are integrally formed on the lower drawing die 500, the two puncture modules 300 have the same structure and are symmetrically arranged on the upper drawing profile 200, as shown in FIG. Figure 3-Figure 4As shown, the puncture module 300 includes a mounting platform 310 and a puncture structure 320. The puncture structure 320 and the mounting platform 310 are integrally formed. The mounting platform 310 is used for positioning and detachable installation of the puncture module 300. The puncture structure 320 is raised by the upper drawing surface 200, and it vertically punches the sheet material downward to form a puncture area that is still partially connected to the sheet material. According to the structural design of the puncture area of ​​the workpiece, it has a puncture oblique line inclined relative to the extension direction of the oblique die surface and arc-shaped transition puncture lines on both sides. The puncture oblique line is located on one side of the puncture area, and the arc-shaped transition puncture line transition extends to the other side of the puncture area. Therefore, The blade line of the puncturing blade 320a and the circumferential path of the puncturing body 320d are both adapted to the puncturing line of the puncturing area. The avoidance module 600 includes a knife groove 610 for accommodating the puncturing structure 320. During the puncturing process, the puncturing body 320d is inserted downward into the knife groove 610. To accommodate various puncturing depth requirements, the groove depth of the knife groove 610 should be slightly greater than the maximum puncturing depth. The circumferential path of the knife groove 610 is consistent with the circumferential path of the puncturing body 320d, and the two ends should be appropriately extended, or even form a closed loop path, to make way for the unpunctured area of ​​the sheet material and avoid tearing at the local connection.

[0027] In order to pre-press the sheet material with a larger inclination to reduce the inclination angle, and at the same time, it is necessary to adapt to the above-mentioned puncture area structure, a puncture blade 320a is provided on the outer lower edge of the puncture body 320d, and a pre-pressing fillet 320b is provided on the inner lower edge. The puncture blade 320a and the pre-pressing fillet 320b are transitionally connected through the pressing surface 320c. The pre-pressing fillet 320b is used to first contact the sheet material to apply downward pressure, and the pressing surface 320c contacts the surface of the sheet material to adjust its inclination. Therefore, the angle between the pressing surface 320c and the horizontal plane should be less than 30° to achieve the purpose of reducing puncture and chipping. Since the puncture area is a semi-enclosed structure, the puncture blade 320a is a continuous blade line, and the pre-pressing fillet 320b is also a continuous surrounding path, when the puncture blade 320a is higher than the pre-pressing fillet 320b, It will be impossible to form a pressing surface 320c that is smaller than the inclination angle of the sheet material. Therefore, the puncture area is divided into a pressing puncture area and a non-pressing puncture area. The pre-pressing radius 320b corresponding to the pressing puncture area is located at the front end of the puncture blade 320a, so as to pre-press the sheet material with a larger inclination, and pre-press the inclination angle to the same angle as the pressing surface 320c before puncturing. The puncture blade 320a corresponding to the non-pressing puncture area is located at the front end of the pre-pressing radius 320b, so that pre-pressing cannot be performed. However, since the puncture blade 320a is located at the outer edge of the puncture body 320d, the non-pressing puncture area is located in the upper area of ​​the puncture area, and the generated puncture debris can be easily collected by the knife groove 610. In addition, the puncture sequence and puncture method of the puncture blade 320a are designed to reduce the generation of puncture debris in this area.

[0028] In this embodiment, the blade line of the piercing blade 320a is adapted to the piercing area structure, which is a semi-enclosed continuous combined line, which includes the lower end blade area 323, the lower transition blade area 322, the front end piercing blade area 321, the upper transition blade area 324 and the upper end blade area 325 from the lower end to the upper end, and the surrounding path of the piercing body 320d and the pre-pressed fillet 320b is adapted to the blade line, as shown in FIG. Figure 5 As shown, the blade line forms a lower terminal blade area 323 and an upper terminal blade area 325 in an "eight" shape at both ends, which extend relatively inwardly toward the puncture area, and the upper terminal blade area 325 is smoothly connected to the upper transition blade area 324 and the puncture base surface, and the lower terminal blade area 323 is smoothly connected to the lower transition blade area 322 and the puncture base surface, and the blade line height is gradually reduced. Compared with the prior art, it can reduce the mutual influence of material flow during the forming process of the puncture area and the non-puncture area of ​​the sheet material, which is beneficial to improving the forming quality of the sheet material in the puncture area; adapted to the puncture area, the front end puncture blade area 321 of the blade line is located on one side of the puncture area, and the upper terminal blade area 325 and the lower terminal blade area 323 are located on the other side of the puncture area, and the upper terminal blade area 325 and the lower terminal blade area 323 are respectively connected to the front end puncture blade area 321 through the upper transition blade area 324 and the lower transition blade area 322 of the arc structure, and the puncture area is located in the surrounding area of ​​the puncture blade 320a. Figure 4 The front puncturing blade area 321 is located at the front end. When the upper drawing die 100 descends, it punctures first. The upper transition blade area 324 and the lower transition blade area 322 are lower than the front puncturing blade area 321, and the height is regularly reduced as the path away from the front puncturing blade area 321 is moved away from the front puncturing blade area 321 to form a puncturing method that gradually punctures along the blade-shaped path. This puncturing method is conducive to reducing the generation of debris, gradually relieving the stress of the sheet material, and reducing puncture and tearing.

[0029] In this embodiment, the blade line of the front end piercing blade area 321 is a straight line, which is parallel to the inclined die surface and is inclined relative to the extension direction of the inclined die surface. Figure 1 and Figure 3 As shown, the puncture area corresponding to the front puncture blade area 321 is the material pressing puncture area. Similarly, the upper end blade area 325 is correspondingly arranged above the material pressing puncture area, and the lower end blade is correspondingly arranged above the non-material pressing puncture area. In addition, as Figure 5 As shown, the dotted auxiliary line is the transposition section, which is a horizontal cross-section perpendicular to the blade line. On this section, the pre-pressed fillet 320b and the piercing blade 320a are located at the same height, and along the surrounding path, they form a relative height opposite to the front end. Figure 5, wherein the upper transition blade area 324 has a first transposition section 326 and a second transposition section 326 near both ends respectively, and the lower transition blade area 322 has a third transposition section 327. Therefore, the first transposition section 326 and the second transposition section 326 divide the upper transition blade area 324 into two transition end blade areas and a middle blade area, and the third transposition section 327 divides the lower transition blade area 322 into a front end transition blade area and a tail end transition blade area. The two transition end blade areas and the front end transition blade area correspond to the pressing and puncturing areas, and the middle blade area and the tail end transition blade area correspond to the non-pressing and puncturing areas. In the non-pressing and puncturing areas, the pre-pressing radius 320b should spiral in the opposite direction of the sheet material along the circumferential path to avoid contact with the sheet material surface during the puncturing process of the corresponding area or adjacent area, affecting the puncturing quality.

[0030] In this embodiment, Figure 7 As shown in the schematic diagram of the puncture principle, the best puncture state is when the sheet is perpendicular to the punching direction, that is, when the sheet is in a horizontal state, the puncture quality is high and less debris is generated. Therefore, the pressing surface 320c that is transitionally connected to the front puncture blade area 321, the lower transition blade area 322, the lower end blade, the two transition end blade areas and the front transition blade area is preferably a horizontal plane, that is, a = 0°. At the same time, a relative punching and cutting puncture method is adopted to improve the incision quality. Therefore, the puncture blade 320a is a right-angle blade, and the outer groove edge 621 of the knife groove 610 used to cooperate with it is preferably a rounded surface to reduce the generation of debris. The gap between the outer groove side 620 of the knife groove 610 and the puncture blade 320a is designed to be 0.2 mm, which meets the relative punching processing requirements of the sheet.

[0031] In this embodiment, the knife groove 610 is surrounded along a closed loop path to form a continuous groove area without an end, which is convenient for centralized processing of the debris in the knife groove 610. At the same time, a chip removal hole 800 is provided at the bottom of the knife groove 610, and the chip removal hole 800 is connected to the chip suction system. The chip suction system generates a negative pressure airflow distributed along the closed loop path of the knife groove 610 to collect and clean the debris at the edge of the knife groove 610 and in the knife groove 610. Figure 6 As shown, there are at least two chip removal holes 800, at least one chip removal hole 800 is located on a lower side of the puncture area, and at least one chip removal hole 800 is located on the other lower side of the puncture area.

[0032] In this embodiment, Figure 3-4 As shown, the mounting platform 310 is a right-angled trapezoidal structure, the upper end surface of which is a horizontal plane, which is convenient for adding a pad to adjust its vertical position. The four edges are flattened at C angles. Two positioning pin holes 340 are vertically penetrated on the mounting platform 310. The two positioning pin holes 340 are arranged on the inner side of the piercing body 320d up and down to locate the position of the piercing structure 320. A number of connecting screw holes 330 are also vertically penetrated on the mounting platform 310 for connecting and installing the mounting platform 310 on the upper drawing die 100.

[0033] The directional words such as "up", "down", "inside", "end", "side", and "front" mentioned in this article are based on Figure 1-Figure 7 The coordinates or orientations shown in . These terms are mainly used to better describe the present invention and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0034] Furthermore, some of the above terms may be used to express other meanings besides indicating a direction or positional relationship. For example, the terms "on" and "in" may also be used to express a dependency or connection relationship in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A drawing die with a puncture structure, comprising an upper drawing die and a lower drawing die, wherein the upper drawing die is provided with an upper drawing profile, the upper drawing profile being an inclined die surface, and the lower drawing die is provided with a lower drawing profile capable of being molded with the upper drawing profile, characterized in that: It also includes: two puncture modules detachably arranged on the upper drawing die and two avoidance modules integrally formed on the lower drawing die, the two puncture modules are symmetrically arranged on the upper drawing profile, the puncture module includes a mounting platform and a puncture structure, the lower end surface of the mounting platform is a puncture base surface adapted to the upper drawing profile, the mounting platform is detachably connected to the upper drawing die, the puncture structure is raised by the puncture base surface, and is located directly above the puncture area of ​​the sheet material, the avoidance module includes a knife groove for accommodating the puncture structure, the knife groove is adapted to the puncture structure, and the puncture structure includes A puncturing body, a puncturing blade located at a lower edge of the puncturing body, a pre-pressed fillet located at another lower edge of the puncturing body, and a pressing surface transitionally connecting the puncturing blade and the pre-pressed fillet, the puncturing area includes a pressing puncturing area and a non-pressing puncturing area, the pre-pressed fillet corresponding to the pressing puncturing area is located at the front end of the puncturing blade so as to contact and press down the sheet material of the puncturing area with an inclination before the puncturing blade, and the pressing surface corresponding to the pressing puncturing area forms an angle a with the horizontal plane, 0≤a<30°, and the puncturing blade corresponding to the non-pressing puncturing area is located at the front end of the pre-pressed fillet.

2. The drawing die with a puncture structure according to claim 1, characterized in that: The blade profile of the puncturing blade is a semi-enclosed and continuously smoothly transitioned combined profile, which includes a lower transition blade area, a front end puncturing blade area and an upper transition blade area from the lower end to the upper end. The front end puncturing blade area is located on one side of the puncturing area, and the upper transition blade area and the lower transition blade area are transitionally connected to the front end puncturing blade area. Both have an arc-shaped structure and extend to the other side of the puncturing area. The upper transition blade area and the lower transition blade area are lower than the front end puncturing blade area, and their heights gradually decrease as they move away from the front end puncturing blade area. The puncturing area is located in the enclosed area of ​​the puncturing blade, the puncturing blade is located at the outer lower edge of the puncturing body, and the pre-pressed fillet is located at the inner lower edge of the puncturing body. The circumferential path of the pre-pressed fillet is adapted to the puncturing blade profile.

3. The drawing die with a puncture structure according to claim 2, characterized in that: The blade line of the front end piercing blade area is a straight line, which is parallel to the inclined mold surface and is inclined relative to the extension direction of the inclined mold surface. The piercing area corresponding to the front end piercing blade area and the lower transition blade area is a pressing piercing area.

4. The drawing die with a puncture structure according to claim 3, characterized in that: The upper transition blade area has a first transposition section and a second transposition section near both ends respectively, and the lower transition blade area has a third transposition section. The first transposition section, the second transposition section and the third transposition section are all horizontal cross-sections. The first transposition section and the second transposition section are respectively perpendicular to the blade line of the upper transition blade area intersecting therewith, and the third transposition section is perpendicular to the blade line of the lower transition blade area intersecting therewith. The first transposition section and the second transposition section divide the upper transition blade area into two transition end blade areas and a middle blade area, and the third transposition section divides the lower transition blade area into a front transition blade area and a tail transition blade area. The two transition end blade areas and the front transition blade area correspond to the material pressing and puncturing areas, and the middle blade area and the tail transition blade area correspond to the non-material pressing and puncturing areas.

5. The drawing die with a puncture structure according to claim 4, characterized in that: The blade line of the puncturing blade extends to both ends to form an upper terminal blade area and a lower terminal blade area respectively. The upper terminal blade area and the lower terminal blade area are located on the other side of the puncturing area and are both straight lines. The two are symmetrical and arranged in an "eight" shape relative to the inner side of the puncturing area. The upper terminal blade area is smoothly connected to the upper transition blade area and the puncturing base surface, and the lower terminal blade area is smoothly connected to the lower transition blade area and the puncturing base surface. The blade line of the lower terminal blade area is arc-shaped. The upper terminal blade area is correspondingly arranged above the pressure material puncturing area, and the lower terminal blade is correspondingly arranged above the non-pressure material puncturing area.

6. The drawing die with a puncture structure according to claim 5, characterized in that: The pressing surface that is transitionally connected to the front piercing edge area, the lower transition edge area, the lower terminal edge area, the two transition end edge areas and the front transition edge area is a horizontal plane, that is, a=0°.

7. The drawing die with a puncture structure according to claim 6, characterized in that: The knife groove surrounds along a closed-loop path, and a chip removal hole is provided at the bottom of the groove. The chip removal hole is connected to the chip suction system. There are at least two chip removal holes, at least one of which is located on the lower side of the puncture area, and at least one of which is located on the other lower side of the puncture area.

8. The drawing die with a puncture structure according to claim 6, characterized in that: The outer groove edge of the knife groove is a rounded surface, and the puncturing blade is a right-angled blade, which cooperates with the puncturing blade to achieve puncturing of the plate material in the middle.

9. The drawing die with a puncture structure according to claim 8, characterized in that: The gap between the outer groove side surface of the knife groove and the puncturing blade is 0.2 mm.

10. The drawing die with a puncture structure according to claim 2, characterized in that: The mounting platform is a right-angled trapezoidal structure, and its upper end surface is a horizontal plane. Two positioning pin holes are vertically arranged on the mounting platform, and the two positioning pin holes are arranged on the inner side of the puncturing body one above the other. Several connecting screw holes are also vertically arranged on the mounting platform for connecting and installing the mounting platform on the upper drawing die.

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