Flexible plate punching die

Abstract

The utility model relates to a flexible plate punching die. The flexible plate punching die comprises an upper die assembly and a lower die assembly. The upper die assembly comprises an upper die base, a fixing plate structure arranged on the bottom face of the upper die base, a stripper plate structure movably arranged on the bottom face of the fixing plate structure and a punching needle structure arranged on the fixing plate structure. The lower die assembly comprises a lower die base and a female die plate arranged on the top face of the lower die base, and a female die cutting edge vertically corresponding to the punching needle structure is arranged on the female die surface of the female die plate. The punching needle structure comprises a punching needle protection sleeve arranged on the fixing plate structure and a punching needle arranged in the punching needle protection sleeve, the punching needle protection sleeve is arranged in the stripper plate structure in a penetrating mode, and a punching head of the punching needle protrudes out of the end of the punching needle protection sleeve and vertically corresponds to the cutting edge of the female die. According to the utility model, the problem that when a small punching needle is adopted to punch a local small window or a local small inner hole on a flexible plate, the punching needle is easy to be stressed unevenly, shakes and fractures can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board processing, in particular to a flexible board punching die. Background Art

[0002] During the production process of flexible circuit boards (abbreviated as flex boards), it is sometimes necessary to use a punching die to punch out the waste part of the circuit board to obtain a flexible board product. In traditional technology, when using a punching die to punch a small local window or a small local inner hole on a flex board, the punching die needs to use a smaller punching needle; and when punching the flex board, a steel sheet is often attached to the flex board to protect it, but due to the offset of the steel sheet, the smaller punching needle will partially touch the steel sheet during punching, causing the punching needle to be unevenly stressed and easily tremble and break. Utility Model Content

[0003] The utility model provides a flexible plate punching die, which can solve the technical problem that when a smaller punching needle is used to punch a local small window or a local small inner hole on a flexible plate in the traditional technology, the punching needle is prone to tremble and break due to uneven force.

[0004] In order to solve the above technical problems, the utility model provides a flexible plate punching die, comprising:

[0005] An upper die assembly comprises an upper die seat, a fixed plate structure arranged on the bottom surface of the upper die seat, a stripper plate structure movably arranged on the bottom surface of the fixed plate structure, and a punching needle structure arranged on the fixed plate structure;

[0006] A lower die assembly comprises a lower die base and a concave die plate arranged on the top surface of the lower die base, wherein a concave die surface of the concave die plate is provided with a concave die cutting edge corresponding to the upper and lower parts of the punching needle structure;

[0007] Among them, the punch needle structure includes a punch needle protective sleeve arranged on the fixed plate structure, and a punching needle arranged in the punch needle protective sleeve. The punch needle protective sleeve is inserted into the stripping plate structure, and the punching head of the punching needle protrudes out of the end of the punch needle protective sleeve and corresponds to the die cutting edge up and down.

[0008] Optionally, the punch needle protective cover includes a protective cover body arranged in an elongated strip shape, the middle portion of the protective cover body having a punch needle hole opened along its length direction, one end of the protective cover body being arranged on the fixed plate structure, the punching needle being inserted into the punch needle hole, and the punching head of the punching needle protruding out of the other end of the protective cover body.

[0009] Optionally, the matching clearance between the punching needle hole and the punching needle is 0.002-0.005mm.

[0010] Optionally, the punching head of the punching needle protrudes 4-6 mm outside the protective sleeve.

[0011] Optionally, the punching needle structure includes a needle body positioning structure laterally arranged between the punching needle protective sleeve and the punching needle.

[0012] Optionally, the punch needle structure includes a sleeve auxiliary fixing structure connected between the punch needle protection sleeve and the fixing plate structure.

[0013] Optionally, a plurality of sleeve body auxiliary fixing structures are respectively provided on the peripheral sides of the punch needle protection sleeve; or,

[0014] The outer side of the punch needle protection sleeve is provided with a sleeve body auxiliary fixing structure.

[0015] Optionally, the sleeve auxiliary fixing structure includes a punch needle fixing pressure block connected to a side surface of the punch needle protection sleeve, and the punch needle fixing pressure block is detachably connected to the fixing plate structure.

[0016] Optionally, a fixed pressing groove is opened on the side of the punch needle protective sleeve, one side of the punch needle fixed pressing block is clamped in the fixed pressing groove, and the other side of the punch needle fixed pressing block is screwed to the fixed plate structure through a fixing screw.

[0017] Optionally, the fixing plate structure comprises an upper pad arranged on the bottom surface of the upper die seat, and an upper fixing plate arranged on the bottom surface of the upper pad, the upper fixing plate is provided with a punch pin fixing hole, and one end of the punch pin protective sleeve is embedded in the punch pin fixing hole;

[0018] The stripping plate structure includes a stripping back plate telescopically connected to the upper fixed plate, and a stripping main plate arranged on the bottom surface of the stripping back plate, a first guide limit hole corresponding to the other end of the punching needle protective sleeve is provided on the stripping back plate, and a second guide limit hole corresponding to the punching head of the punching needle is provided on the stripping main plate, and the second guide limit hole is connected to the first guide limit hole.

[0019] The beneficial effects brought by the technical solution provided by the utility model include:

[0020] By providing a punching needle structure consisting of a punching needle protective sleeve and a punching needle on the fixed plate structure of the upper die assembly, the punching needle can be protected by the punching needle protective sleeve, and the strength of the punching needle can be improved. When the fixed plate structure and the punching needle structure thereon are driven downward by the upper die seat, the punching needle of the punching needle structure will extend to the bottom of the stripping plate structure, and punch the flexible plate to be punched at the die cutting edge of the concave die plate on the lower die assembly of the lower die assembly, so as to punch a local small window or a local small inner hole on the flexible plate to be punched. When a steel sheet or other reinforcing plate is attached to the flexible plate to be punched, and there is an offset in the attachment, the punching needle of the punching needle structure protruding from the punching head outside the punching needle protective sleeve touches the steel sheet or other reinforcing plate, and the punching needle protective sleeve can strengthen and protect the weak parts such as the middle part of the punching needle to prevent the punching needle from shaking and breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic structural diagram of the flexible plate punching die according to an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the planar structure of the flexible plate when the flexible plate punching die according to the embodiment of the utility model punches the flexible plate;

[0024] Figure 3 This is a simplified structural diagram of the upper die assembly of the flexible plate punching die according to an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the local structure of the connection between the fixed plate structure and the punch pin structure of the upper die assembly according to the embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the front structure of the punching needle structure according to the embodiment of the utility model;

[0027] Figure 6 A schematic diagram of the top view of the punch needle protection cover of the punch needle structure according to the embodiment of the utility model;

[0028] Figure 7 This is a schematic structural diagram of the flexible plate punching die (before punching the flexible plate) described in an embodiment of the utility model;

[0029] Figure 8 This is a schematic structural diagram of the flexible plate punching die (when punching the flexible plate) according to an embodiment of the utility model;

[0030] Fig. 9 This is a schematic structural diagram of the flexible plate punching mold (after the flexible plate is punched) described in an embodiment of the utility model.

[0031] In the figure: 10, flexible plate; 12, local small window (or local small inner hole); 20, steel sheet; 100, flexible plate punching mold; 102, upper mold assembly; 104, lower mold assembly; 110, upper mold base; 120, fixed plate structure; 122, upper pad; 124, upper fixed plate; 130, stripping plate structure; 132, stripping back plate; 1322, first guide limit hole; 134, stripping main board; 1342, second guide limit hole; 140, punch needle structure; 142, punch needle protective sleeve; 144, punching needle; 1424, punch needle hole; 1426, fixed pressure groove; 146, needle body positioning structure; 148, sleeve body auxiliary fixing structure; 1482, punch needle fixed pressure block; 150, lower mold base; 160, concave mold plate; 162, concave mold surface; 164, concave mold cutting edge. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1 to Figure 2 As shown, the utility model provides a flexible plate punching die 100, comprising an upper die assembly 102, and a lower die assembly 104 corresponding to the upper die assembly 102. When it is necessary to punch a local small window 12 or a local small inner hole on the flexible plate 10, the flexible plate 10 to be punched (a steel sheet 20 or other reinforcing sheet may be pre-attached to the flexible plate 10) may be positioned and placed on the lower die assembly 104, and then the upper die assembly 102 and the lower die assembly 104 are molded together, so that the upper die assembly 102 punches a local small window or a local small inner hole on the flexible plate on the lower die assembly 104 to obtain a flexible plate product.

[0034] Specifically, the upper die assembly 102 may include an upper die base 110, a fixed plate structure 120 disposed on the bottom surface of the upper die base 110, a stripper plate structure 130 movably disposed on the bottom surface of the fixed plate structure 120, and a punching needle structure 140 disposed on the fixed plate structure 120. Moreover, the lower die assembly 104 may include a lower die base 150, and a concave die plate 160 disposed on the top surface of the lower die base 150, and a concave die surface 162 of the concave die plate 160 is provided with a concave die cutting edge 164 corresponding to the upper and lower parts of the punching needle structure 140. Figures 7 to 9 As shown, the punch needle structure 140 can be fixed by the fixed plate structure 120, and the fixed plate structure 120 and the punch needle structure 140 thereon can be driven to move up and down by the upper mold base 110, so that the punch needle structure 140 moves downward to punch the flexible plate 10 at the die cutting edge 164 of the die plate 160 positioned on the lower mold base 150, and the stripping plate structure 130 can be used to guide and limit the punch needle structure 140 when punching the flexible plate 10, and the punch needle structure 140 moves upward after the punch needle structure 140 completes the punching, and the punch needle structure 140 is demolded from the die plate 160 by the stripping plate structure 130.

[0035] Moreover, if Figures 3 to 6 As shown, the punching needle structure 140 may include a punching needle protective sleeve 142 disposed on the fixed plate structure 120, and a punching needle 144 disposed in the punching needle protective sleeve 142. The punching needle protective sleeve 142 is inserted into the stripping plate structure 130. The punching head of the punching needle 144 protrudes out of the end of the punching needle protective sleeve 142 and corresponds to the die cutting edge 164 of the die surface 162 of the die plate 160. By arranging the punching needle structure 140 composed of the punching needle protective sleeve 142 and the punching needle 144 on the fixed plate structure 120 of the upper die assembly 102, the punching needle 144 can be protected by the punching needle protective sleeve 142, and the strength of the punching needle 144 can be improved.

[0036] When the fixed plate structure 120 and the punching needle structure 140 thereon are driven downward by the upper die seat 110, the punching needle 144 of the punching needle structure 140 will extend to the bottom of the stripping plate structure 130, and punch the flexible plate 10 to be punched at the die cutting edge 164 of the die plate 160 on the lower die assembly of the lower die assembly 104, so as to punch a local small window 12 or a local small inner hole on the flexible plate 10 to be punched. When a steel sheet 20 or other reinforcing plate is attached to the flexible plate 10 to be punched, and there is an offset in the attachment, the punching needle 144 of the punching needle structure 140 protrudes from the punching needle protective cover 142. The punching needle protective cover 142 can strengthen and protect the weak parts such as the middle part of the punching needle 144 to prevent the punching needle 144 from shaking and breaking.

[0037] Furthermore, the fixing plate structure 120 of the upper die assembly 102 may include an upper pad 122 disposed on the bottom surface of the upper die seat 110, and an upper fixing plate 124 disposed on the bottom surface of the upper pad 122, and a punch pin fixing hole is disposed on the upper fixing plate 124, and one end of the punch pin protective sleeve 142 may be embedded in the punch pin fixing hole. That is, one end of the punch pin structure 140 may be embedded in the upper fixing plate 124 of the fixing plate structure 120, and the installation is simple. In addition, the punch pin protective sleeve 142 may be detachably connected to the upper fixing plate 124 by means of a snap connection or a threaded connection; in addition, the punch pin protective sleeve 142 may be fixedly connected to the upper fixing plate 124 by means of welding, fusion, riveting, and the like.

[0038] Moreover, the stripping plate structure 130 may include a stripping back plate 132 that is telescopically connected to the upper fixed plate 124, and a stripping main plate 134 disposed on the bottom surface of the stripping back plate 132, a first guide limit hole 1322 corresponding to the other end of the punching needle protective sleeve 142 is provided on the stripping main plate 134, a second guide limit hole 1342 corresponding to the punching head of the punching needle 144 is provided on the stripping main plate 134, and the second guide limit hole 1342 is connected to the first guide limit hole 1322. The punching needle protective sleeve 142 can be guided and limited by the first guide limit hole 1322, and the punching head of the punching needle 144 can be guided and limited by the second guide limit hole 1342, so that the punching needle structure 140 can move up or down along the first guide limit hole 1322 and the second guide limit hole 1342. Moreover, the cross-sectional area of ​​the first guide limit hole 1322 corresponds to the cross-sectional area of ​​the punch needle protection sleeve 142, and the cross-sectional area of ​​the second guide limit hole 1342 corresponds to the cross-sectional area of ​​the punching head of the punching needle 144, so that the punching head of the punching needle 144 can pass through the first guide limit hole 1322 and the second guide limit hole 1342, while the punch needle protection sleeve 142 can only be inserted into the first guide limit hole 1322 and cannot pass through the second guide limit hole 1342.

[0039] In addition, the punching needle protective sleeve 142 of the punching needle structure 140 may include a protective sleeve body that is arranged in a long strip shape, and a punching needle hole 1424 is provided in the middle of the protective sleeve body along its length direction, one end of the protective sleeve body is arranged on the fixed plate structure 120, and the punching needle 144 is inserted into the punching needle hole 1424, and the punching head of the punching needle 144 protrudes out of the other end of the protective sleeve body. By providing the punching needle hole 1424 extending in the length direction in the middle of the protective sleeve body of the punching needle protective sleeve 142, the punching needle 144 can be accommodated through the punching needle hole 1424, so that the punching needle 144 is strengthened and protected by the protective sleeve body to enhance the strength of the punching needle 144. Moreover, by protruding the punching head of the punching needle 144 outside the protective sleeve body, it is convenient to punch the flexible plate through the punching head.

[0040] Moreover, the protective sleeve can be a rigid sleeve, such as a steel sleeve; in addition, the protective sleeve can also be a flexible sleeve, such as a plastic sleeve; in addition, the protective sleeve can also be a multi-layer sleeve, such as a flexible sleeve is arranged inside the steel sleeve, and the punching needle 144 is inserted into the flexible sleeve. In addition, the protective sleeve can also be a wooden sleeve, etc.

[0041] Moreover, the punching needle hole 1424 can be set as a blind hole, that is, a hole with one end closed and the other end open, so that one end of the punching needle 144 is closed in the protective sleeve body, and the punching head of the other end of the punching needle 144 can protrude out of the protective sleeve body. In addition, the punching needle hole 1424 can also be set as a through hole, that is, both ends of the punching needle hole 1424 pass through the protective sleeve body, which is convenient for the punching needle 144 to be placed in the protective sleeve body, and the punching head of the punching needle 144 protrudes out of the protective sleeve body.

[0042] Furthermore, the protective sleeve body can be set as a long columnar structure. Specifically, the protective sleeve body can be set as a square column, a rectangular column, or a circular column. Moreover, the punching needle hole 1424 can be opened at the center of the long columnar structure, such as on the axis of the circular column. For example, the protective sleeve body can be set as a rectangular column, and the length of its cross section can be set to 3mm and the width can be set to 2mm. The specific size can be designed according to the size of the punching needle 144.

[0043] In addition, the punching needle 144 can be interference fit with the punching needle hole 1424 or clearance fit. In this embodiment, the punching needle 144 can be clearance fit with the punching needle hole 1424, and the clearance between the punching needle hole 1424 and the punching needle 144 is 0.002-0.005mm, making the assembly of the punching needle 144 and the protective sleeve body simple and convenient.

[0044] Moreover, the punching head of the punching needle 144 protrudes 4-6 mm outside the protective sleeve. By making the punching head of the punching needle 144 protrude a preset length outside the protective sleeve, it is convenient to punch the flexible plate 10 through the punching head, and the main part of the punching needle 144 can also be fully protected. When a part of the punching head of the punching needle 144 (such as one side of the punching head) punches the offset steel sheet 20 or other reinforcing sheet, the middle part of the punching needle 144 is subjected to a large shear force and is prone to deformation (one end of the punching needle 144 is fixed on the fixed plate structure 120, and the other end is limited on the stripping plate structure 130), resulting in the breakage of the punching needle 144. By embedding the middle part of the punching needle 144 and other parts outside the punching head in the protective sleeve, the strength of the punching needle 144 can be enhanced and it is not easy to deform. In addition, the length of the punching head protruding from the protective sleeve can be 4 mm, 5 mm, or 6 mm, or any length value between 4-6 mm. The specific length can be set according to actual needs.

[0045] In addition, if Figure 5As shown, the punch needle structure 140 may include a needle body positioning structure 146 disposed transversely between the punch needle protective sleeve 142 and the punching needle 144. Moreover, there may be one needle body positioning structure 146, and one needle body positioning structure 146 may be disposed at the fixed end of the punch needle protective sleeve 142 (referring to the end connected to the fixed plate structure 120); there may also be multiple needle body positioning structures 146, and multiple needle body positioning structures 146 may be disposed at multiple positions of the punch needle protective sleeve 142. By providing the needle body positioning structure 146, the punching needle 144 can be fixed on the punch needle protective sleeve 142, so as to prevent the punching needle 144 from moving up and down in the punch needle protective sleeve 142 during use, thereby affecting the punching effect of the punching head.

[0046] Specifically, the needle body positioning structure 146 may include a positioning pin or a positioning rod that is transversely (perpendicular to the length direction of the punch needle protective sleeve 142) penetrated through the punch needle protective sleeve 142 and the punching needle 144. In addition, a first positioning hole may be provided transversely on the punch needle protective sleeve 142, and a corresponding second positioning hole or second positioning groove may be provided on the punching needle 144, so that the positioning pin or the positioning rod passes through the first positioning hole and the second positioning hole (or the second positioning groove) at the same time, and the punch needle protective sleeve 142 and the punching needle 144 are fixed together. In addition, the first positioning hole may be provided as a through hole or a blind hole.

[0047] In addition, if Figures 3 to 5 As shown, the punch needle structure 140 may include a sleeve auxiliary fixing structure 148 connected between the punch needle protection sleeve 142 and the fixed plate structure 120. The punch needle protection sleeve 142 can be further fixed to the fixed plate structure 120 through the sleeve auxiliary fixing structure 148, so that the fixation of the punch needle structure 140 and the fixed plate structure 120 is more firm and reliable. Moreover, the peripheral side of the punch needle protection sleeve 142 may be respectively provided with a plurality of (referring to two or more) sleeve auxiliary fixing structures 148, that is, the punch needle structure 140 can be assisted to be fixed to the fixed plate structure 120 from multiple positions through a plurality of sleeve auxiliary fixing structures 148, which is firm and reliable. In addition, a sleeve auxiliary fixing structure 148 may be provided on the outer side of the punch needle protection sleeve 142, that is, the punch needle structure 140 can be assisted to be fixed to the fixed plate structure 120 from multiple positions through a sleeve auxiliary fixing structure 148, and the structure is simple.

[0048] Furthermore, the sleeve auxiliary fixing structure 148 may include a punch pin fixing pressure block 1482 connected to the side of the punch pin protective sleeve 142, and the punch pin fixing pressure block 1482 may be detachably connected to the fixed plate structure 120. That is, by setting the punch pin fixing pressure block 1482, the side of the punch pin protective sleeve 142 and the bottom surface of the upper fixed plate 124 of the fixed plate structure 120 are connected and fixed. Moreover, the punch pin fixing pressure block 1482 may be integrally provided on (or fixedly provided on) the side of the punch pin protective sleeve 142, or may be detachably provided on the side of the punch pin protective sleeve 142. By detachably connecting the punch pin fixing pressure block 1482 to the fixed plate structure 120, it is convenient to install and disassemble the two.

[0049] Moreover, a fixed pressing groove 1426 may be provided on the side of the punch needle protection sleeve 142, and one side of the punch needle fixed pressing block 1482 may be clamped in the fixed pressing groove 1426, and the other side of the punch needle fixed pressing block 1482 may be screwed to the upper fixed plate 124 of the fixed plate structure 120 through a fixing screw. By embedding one side of the punch needle fixed pressing block 1482 in the side of the punch needle protection sleeve 142, and detachably connecting the other side of the punch needle fixed pressing block 1482 to the upper fixed plate 124 of the fixed plate structure 120, the punch needle protection sleeve 142 and the punch needle structure 140 can be conveniently press-fitted and positioned from the side. In addition, a first buckle structure may be provided between one side of the punch needle fixed pressing block 1482 and the side of the punch needle protection sleeve 142 to buckle the two. In addition, a second buckle structure may be provided between the other side of the punch needle fixed pressing block 1482 and the upper fixed plate 124 of the fixed plate structure 120 to buckle the two.

[0050] like Figures 7 to 9As shown, the flexible plate punching die 100 provided by the utility model, before punching the flexible plate 10, the tail of the punching needle 144 and the punching needle protective cover 142 can be fixed on the upper fixed plate 124 of the upper die assembly 102, the punching head of the punching needle 144 can be retracted into the stripping main board 134 of the stripping plate structure 130, and the flexible plate 10 to be punched is placed and positioned at the concave die edge 164 of the concave die surface 162 of the concave die plate 160 of the lower die assembly 104, corresponding to the punching head of the punching needle 144 up and down; when punching the flexible plate 10, the lower die seat 15 0 drives the fixed plate structure 120, the punching needle structure 140 and the stripping plate structure 130 downward, so that the stripping main board 134 and the concave plate 160 of the stripping plate structure 130 are fitted together, and the punching needle 144 and the punching needle protective cover 142 continue to move downward under the downward pressure of the upper die seat 110, so that the punching head of the punching needle 144 extends out of the stripping main board 134 of the stripping plate structure 130, and performs a shearing action on the flexible plate 10 placed at the concave die edge 164 of the concave die surface 162 of the concave plate 160, so as to punch out a local small window 12 or a local small inner hole on the flexible plate. Moreover, during the punching process, even if the punching head of the punching needle 144 collides with the steel sheet or other reinforcing plate on the flexible plate 10, the punching needle protective cover 142 can also provide enhanced protection for the punching needle 144 to prevent the punching needle 144 from deformation and breakage.

[0051] It should be noted that, in the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] The above description is only a specific embodiment of the utility model, so that those skilled in the art can understand or implement the utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the utility model described herein.

Claims

1. A flexible plate punching die, characterized in that: include: An upper die assembly comprises an upper die seat, a fixed plate structure arranged on the bottom surface of the upper die seat, a stripper plate structure movably arranged on the bottom surface of the fixed plate structure, and a punching needle structure arranged on the fixed plate structure; A lower die assembly comprises a lower die base and a concave die plate arranged on the top surface of the lower die base, wherein a concave die surface of the concave die plate is provided with a concave die cutting edge corresponding to the upper and lower parts of the punching needle structure; Among them, the punch needle structure includes a punch needle protective sleeve arranged on the fixed plate structure, and a punching needle arranged in the punch needle protective sleeve. The punch needle protective sleeve is inserted into the stripping plate structure, and the punching head of the punching needle protrudes out of the end of the punch needle protective sleeve and corresponds to the die cutting edge up and down.

2. The flexible plate punching die according to claim 1, characterized in that: The punching needle protective sleeve includes a protective sleeve body that is arranged in a long strip shape, the middle part of the protective sleeve body has a punching needle hole opened along its length direction, one end of the protective sleeve body is arranged on the fixed plate structure, the punching needle is inserted into the punching needle hole, and the punching head of the punching needle protrudes out of the other end of the protective sleeve body.

3. The flexible plate punching die according to claim 2, characterized in that: The matching clearance between the punching needle hole and the punching needle is 0.002-0.005mm.

4. The flexible plate punching die according to claim 2, characterized in that: The punching head of the punching needle protrudes 4-6 mm outside the protective sleeve.

5. The flexible plate punching die according to claim 2, characterized in that: The punch needle structure comprises a needle body positioning structure which is laterally arranged between the punch needle protection sleeve and the punching needle.

6. The flexible plate punching die according to any one of claims 1 to 5, characterized in that: The punch needle structure comprises a sleeve auxiliary fixing structure connected between the punch needle protection sleeve and the fixing plate structure.

7. The flexible plate punching die according to claim 6, characterized in that: A plurality of sleeve body auxiliary fixing structures are respectively provided on the peripheral side of the punch needle protection sleeve; or, The outer side of the punch needle protection sleeve is provided with a sleeve body auxiliary fixing structure.

8. The flexible plate punching die according to claim 6, characterized in that: The sleeve auxiliary fixing structure comprises a punch needle fixing pressing block connected to the side of the punch needle protection sleeve, and the punch needle fixing pressing block is detachably connected to the fixing plate structure.

9. The flexible plate punching die according to claim 8, characterized in that: A fixing groove is provided on the side of the punch needle protective sleeve, one side of the punch needle fixing block is clamped in the fixing groove, and the other side of the punch needle fixing block is screwed to the fixing plate structure through a fixing screw.

10. The flexible plate punching die according to any one of claims 1 to 5, characterized in that: The fixing plate structure comprises an upper pad arranged on the bottom surface of the upper die seat, and an upper fixing plate arranged on the bottom surface of the upper pad, wherein a punch pin fixing hole is arranged on the upper fixing plate, and one end of the punch pin protective sleeve is embedded in the punch pin fixing hole; The stripping plate structure includes a stripping back plate telescopically connected to the upper fixed plate, and a stripping main plate arranged on the bottom surface of the stripping back plate, a first guide limit hole corresponding to the other end of the punching needle protective sleeve is provided on the stripping back plate, and a second guide limit hole corresponding to the punching head of the punching needle is provided on the stripping main plate, and the second guide limit hole is connected to the first guide limit hole.

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