Progressive die capable of preventing material belt from warping

Abstract

The utility model provides a progressive die capable of preventing a material belt from warping, and relates to the technical field of stamping equipment. The forming die comprises a lower die body, an upper die body and a limiting assembly, the lower die body is suitable for bearing the material belt, the upper die body and the lower die body are suitable for being spliced, a forming die cavity used for machining the material belt is formed between the upper die body and the lower die body, and a plurality of stations are sequentially arranged in the forming die cavity in the moving direction of the material belt. The limiting assembly is arranged on the lower die, a limiting channel is formed between the limiting assembly and the lower die, and the material belt can penetrate through the limiting channel and abut against the inner wall of the limiting channel. The device has the advantage that the material belt is not prone to warping.

Description

Technical Field

[0001] The present application relates to the technical field of stamping equipment, and in particular to a progressive die for preventing material strip warping. Background Art

[0002] The progressive die is composed of multiple stations arranged according to the moving direction of the material strip, and each station can perform different processing on the material strip.

[0003] The existing progressive die stamping machine generally includes a progressive die, a punch press, a feeding device and a feeding device. The progressive die includes a lower die and an upper die. The punch press is connected to the upper die and can drive the upper die to punch the lower die. In one stamping of the punch press, the upper die can simultaneously stamp the material strip at each station on the lower die; after one stamping of the punch press is completed, the feeding device can provide the material strip to the feeding device, and the feeding device can drive the material strip to feed and move along the moving direction of the material strip according to a fixed feeding distance, so that the material strip moves a feeding distance along the moving direction of the material strip on the lower die, thereby being able to process the material strip by repeating the above-mentioned operation process.

[0004] The existing feeding device generally includes a material transfer clamp, which is arranged at the feeding side of the progressive die and can first clamp the material strip at the initial position, then drive the material strip to move a feeding distance along the moving direction of the material strip, and finally release the material strip and return to the original position. However, when the material transfer clamp clamps a part of the material strip to drive the entire material strip to move along the moving direction of the material strip, the material strip between the material transfer clamp and the progressive die and on the progressive die is prone to warping, which may cause stamping misalignment.

[0005] In view of this, it is necessary to provide a progressive die that can prevent strip warping. Utility Model Content

[0006] In order to solve the problem that the material strip pushed when the feeding device moves the material strip is prone to warping, resulting in stamping misalignment, the present application provides a progressive die that prevents the material strip from warping.

[0007] The present application provides a progressive die for preventing material strip from warping, and adopts the following technical scheme: a lower die, an upper die and a limiting assembly, wherein the lower die is suitable for receiving the material strip, the upper die is suitable for being assembled with the lower die and forming a molding cavity for processing the material strip therebetween, a plurality of workstations are sequentially arranged in the molding cavity along the moving direction of the material strip, the limiting assembly is arranged on the lower die and forms a limiting channel therebetween, and the material strip can pass through the limiting channel and abut against the inner wall of the limiting channel.

[0008] By adopting the above technical solution, when the material transfer clamp moves the material strip, the inner wall of the limiting channel can abut against the material strip located on the lower mold, so that the material strip located on the lower mold is not prone to warping, thereby avoiding the situation where a part of the material strip located on the lower mold is warped, causing another part of the material strip located on the lower mold to fail to move to the workstation to which it should be moved along the moving direction of the material strip, thereby causing these misplaced material strips to be damaged or scrapped, thereby improving the yield rate of progressive mold processing.

[0009] Specifically, a plurality of groups of punch heads are arranged on one side end surface of the upper die facing the lower die along the moving direction of the material strip, and a plurality of groups of die grooves are arranged on one side end surface of the lower die facing the upper die. The number of groups of the punch heads is consistent with the number of groups of the die grooves and corresponds one to one. When the upper die and the lower die are assembled, each group of the punch heads can cooperate with a corresponding group of the die grooves to process the material strip;

[0010] The limiting assembly includes multiple pairs of limiting members, which are arranged on the end surface of the lower mold facing the upper mold, and are arranged in two rows along the moving direction of the material strip. Each pair of limiting members is symmetrically arranged with the central axis of the lower mold along the length direction as the symmetry axis, and a limiting protrusion is provided on the top of each of the limiting members, and the limiting channel is formed between the limiting protrusion and the end surface of the lower mold facing the upper mold.

[0011] By adopting the above technical solution, the punch head can cooperate with the corresponding die groove to process the material strip; multiple pairs of limit members can limit the upper and lower positions of the material strip at each workstation, so as to ensure that when the material transfer clamp moves the material strip, the material strip at each workstation on the lower die will not warp, thereby ensuring that stamping misalignment will not occur due to the warping of the material strip when processing the material strip.

[0012] Furthermore, it also includes a protective plate, and a pair of limiting members are provided on one side of the lower mold close to the feeding device, the bottom of the protective plate is connected to the top of the pair of limiting members, and the plate surface of the protective plate is perpendicular to the moving direction of the material belt.

[0013] By adopting the above technical solution, when a worker stands near the feeding side of the lower die and prepares to place the material strip on the lower die, the protective plate can prevent the worker from putting his hand between the upper die and the lower die to operate the material strip, thereby preventing the worker from engaging in dangerous behavior and avoiding the worker from being pinched by the punch press.

[0014] Furthermore, it also includes an auxiliary limiting assembly, which is arranged between the material transfer clamp of the feeding device and the lower mold, and the auxiliary limiting assembly includes a pair of folding rods arranged opposite to each other up and down, and a feeding channel is formed between the rod bodies of the pair of folding rods, and the material belt can pass through the feeding channel and abut against the folding rods;

[0015] One end of the folding rod located at the top is hinged to the protective plate, and the other end of the folding rod is hinged to the material transfer clamp;

[0016] One end of the folding rod located below is hinged to the lower mold, and the other end of the folding rod is also hinged to the material transferring clamp. When the material transferring clamp approaches the lower mold, the pair of folding rods can fold and shorten the feed channel. When the material transferring clamp moves away from the lower mold, the pair of folding rods can unfold and lengthen the feed channel.

[0017] By adopting the above technical solution, the feed channel can limit the material strip in the vertical direction, so that the material strip between the material transfer clamp and the progressive die is not prone to warping; when the material transfer clamp is close to the progressive die, the folding rods can be contracted together, and when the material transfer clamp is away from the progressive die, the folding rods can be unfolded together, so that the feed channel can cooperate with the movement of the material transfer clamp to produce or shorten, thereby ensuring that the material strip can be limited by the feed channel during the movement of the material transfer clamp.

[0018] Furthermore, the folding rod comprises a pair of rotating rods and a hinge shaft, the rod bodies of the pair of rotating rods can abut against the material belt, the end of one of the pair of rotating rods is connected to the hinge shaft, and the end of the other of the pair of rotating rods is provided with a connecting ear;

[0019] One end of the hinge shaft is connected to the rotating rod, and the other end of the hinge shaft extends away from the feeding channel and is provided with a threaded section for threading a nut. The connecting ear can be sleeved on the hinge shaft and abut against the nut.

[0020] By adopting the above technical solution, the two rotating rods can be hinged by the hinge shaft and the connecting ear, and the rod body of the folding rod can form a flat abutment surface, so that the material strip in the feed channel will not warp when it abuts against the abutment surface, thereby ensuring that the subsequent progressive die processing of the material strip will not occur because the material strip is warped before entering the mold, and this part of the warped material strip will collide with the inner wall of the limiting channel when entering the limiting channel, thereby making it impossible for the material strip on the mold to move to the predetermined processing position, resulting in stamping misalignment.

[0021] Furthermore, a plurality of guide posts are arranged at intervals on an end surface of the upper die facing the lower die, and a plurality of positioning holes are arranged on an end surface of the lower die facing the upper die. The number of the guide posts and the positioning holes are consistent and correspond one to one. When the upper die and the lower die are assembled, each of the guide posts can be inserted into the corresponding positioning hole.

[0022] By adopting the above technical solution, when the upper die and the lower die are assembled, the guide column can cooperate with the positioning hole to guide the upper die and the lower die, so that the upper die and the lower die will not be skewed or other assembly errors when assembled, ensuring that the progressive die can correctly process the material strip.

[0023] Furthermore, each of the positioning holes is provided with a ball sleeve, and when the upper mold and the lower mold are assembled, each of the guide posts can be inserted into the ball sleeve in the corresponding positioning hole.

[0024] By adopting the above technical solution, when the guide column is inserted into the ball sleeve, the balls arranged on the inner wall of the ball sleeve can reduce the friction between the column body of the guide column and the inner wall of the ball sleeve, thereby facilitating the guide column to be inserted into the ball sleeve or pulled out from the ball sleeve.

[0025] Furthermore, a blanking hole leading to the outside is provided at the bottom of the die groove, and the material punched out from the material strip by the punch head can leave the die groove through the blanking hole.

[0026] By adopting the above technical solution, the waste or finished products punched out from the material strip by the punch head can fall to the outside through the blanking hole, so that these waste and finished products can automatically leave the progressive die, thereby realizing continuous processing of the material strip.

[0027] In summary, this application includes the following beneficial technical effects:

[0028] A lower die, an upper die and a limiting assembly are provided, the lower die is suitable for receiving the material strip, the upper die is suitable for being assembled with the lower die and forming a molding cavity for processing the material strip therebetween, a plurality of workstations are arranged in sequence along the moving direction of the material strip in the molding cavity, the limiting assembly is provided on the lower die and a limiting channel is formed therebetween, the material strip can pass through the limiting channel and abut against the inner wall of the limiting channel, so that the material strip located on the lower die is not prone to warping, thereby avoiding the situation where a part of the material strip located on the lower die is warped, causing another part of the material strip located on the lower die to fail to move along the moving direction of the material strip to the workstation to which it should move, thereby causing these misplaced material strips to be damaged or scrapped, thereby improving the yield rate of progressive die processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional diagram of a progressive die for preventing strip warping of the present application;

[0030] Figure 2 is a top view of a progressive die for preventing strip warping of the present application, wherein the upper die is deleted to facilitate showing the lower die;

[0031] Figure 3 is along Figure 2A schematic cross-sectional view taken along the AA direction, in which only part of the lower die and part of the material transfer clamp are shown.

[0032] Figure numerals: 1. lower die; 11. die groove; 111. blanking hole; 12. positioning hole; 13. ball sleeve; 2. upper die; 21. guide column; 3. limit assembly; 31. limit column; 32. limit plate; 4. material belt; 5. protective plate; 6. auxiliary limit assembly; 61. rotating rod; 62. hinge shaft; 63. connecting ear; 7. feeding device; 71. material transfer clamp; 8. feeding device. DETAILED DESCRIPTION

[0033] Figure 1 This is a three-dimensional diagram of a progressive die for preventing strip warping of the present application. Figure 2 is a top view of a progressive die for preventing strip warping of the present application, wherein the upper die is deleted to facilitate the illustration of the lower die. Figure 1 and Figure 2 The present application provides a progressive die for preventing material strip warping, comprising: a lower die 1, an upper die 2 and a limiting assembly 3, wherein the lower die 1 is suitable for receiving the material strip 4, the upper die 2 is suitable for being assembled with the lower die 1 and forming a molding cavity for processing the material strip 4 therebetween, a plurality of workstations are sequentially arranged in the molding cavity along the moving direction of the material strip 4, the limiting assembly 3 is arranged on the lower die 1 and forms a limiting channel therebetween, when the material transfer clamp 71 moves the material strip 4, the inner wall of the limiting channel can abut against the material strip 4 located on the lower die 1, so that the material strip 4 located on the lower die 1 is not easy to warp, thereby avoiding the situation that due to the warping of a part of the material strip 4 located on the lower die 1, another part of the material strip 4 located on the lower die 1 is not moved to the workstation to which it should be moved along the moving direction of the material strip 4, thereby causing these misplaced material strips 4 to be damaged or scrapped, thereby improving the yield rate of progressive die processing.

[0034] See also Figure 1 and Figure 2 A feeding device 8 and a feeding device 7 are provided at the feeding side of the progressive die. A coil of material 4 is installed on the feeding device 8. The feeding device 7 can drive the material transfer clamp 71 to send the material strip 4 from the feeding device 8 to the progressive die. A plurality of groups of die grooves 11 are provided on the end surface of the lower die 1 facing the upper die 2 along the moving direction of the material strip 4. A plurality of groups of punch heads are provided on the end surface of the upper die 2 facing the lower die 1. The number of groups of punch heads is consistent with the number of groups of die grooves 11. Each group of punch heads corresponds to a group of die grooves 11 and is combined together to form a work station. When the upper die 2 is assembled with the lower die 1, each group of punch heads can cooperate with the corresponding group of die grooves 11 to process the material strip 4, so that the progressive die can cooperate with the feeding device 8 and the feeding device 7 to realize the processing of the material strip 4.

[0035] See also Figure 1 and Figure 2The limit assembly 3 includes multiple pairs of limit members, which are arranged on the end surface of the lower mold 1 facing the upper mold 2, and the multiple pairs of limit members are arranged in two rows along the moving direction of the material strip 4, and each pair of limit members is symmetrically arranged with the central axis of the lower mold 1 along the length direction as the symmetry axis. A limit protrusion is provided on the top of each limit member, and a limit channel is formed between the limit protrusion and the end surface of the lower mold 1 facing the upper mold 2. By arranging multiple pairs of limit members, the material strip 4 at each workstation can be limited up and down to ensure that when the material transfer clamp 71 moves the material strip 4, the material strip 4 at each workstation on the lower mold 1 will not warp, thereby ensuring that stamping dislocation will not occur due to the warping of the material strip 4 when processing the material strip 4.

[0036] Specifically, the limiting member can be set as a limiting column 31 or a limiting plate 32. The limiting column 31 can be set at a workstation that is far away from the material transfer clamp 71 and is not prone to warping, and the limiting plate 32 can be set at a workstation that is close to the material transfer clamp 71 and is prone to warping. The plate surface of the limiting plate 32 extends along the moving direction of the material strip 4, and the limiting protrusion of the limiting plate 32 runs through the entire limiting plate 32 along the moving direction of the material strip 4, so as to ensure that the material strip 4 will not warp when passing through the limiting channel formed between the limiting protrusion of the limiting plate 32 and the lower mold 1.

[0037] See also Figure 1 and Figure 2 A progressive die for preventing the material strip 4 from warping also includes a protective plate 5, a pair of limit plates 32 are provided on the side of the lower die 1 close to the feeding device 7, the bottom of the protective plate 5 is connected to the side of the top plate edge of the pair of limit plates 32 close to the material moving clamp 71, and the plate surface of the protective plate 5 is perpendicular to the moving direction of the material strip 4. Through the above design, when a worker stands near the feeding side of the lower die 1 and prepares to place the material strip 4 on the lower die 1, the protective plate 5 can prevent the worker from extending his hand between the upper die 2 and the lower die 1 to operate the material strip 4, so as to prevent the worker from dangerous behavior and avoid the worker from being pinched by the punch press.

[0038] See also Figure 1 and Figure 2 A progressive die for preventing the material strip 4 from warping also includes an auxiliary limiting assembly 6, which is arranged between the material transfer clamp 71 of the feeding device 7 and the lower die 1. The auxiliary limiting assembly 6 includes two pairs of folding rods, which are symmetrically arranged with the central axis along the length direction of the lower die 1 as the symmetry axis, and each pair of folding rods are arranged opposite to each other up and down, one end of the upper folding rod is hinged to the protective plate 5, the other end of the upper folding rod is hinged to the material transfer clamp 71, one end of the lower folding rod is hinged to the lower die 1, and the other end of the lower folding rod is also hinged to the material transfer clamp 71, and a feeding channel is formed between the rod body of the upper folding rod and the rod body of the lower folding rod, and the material strip 4 can pass through the feeding channel and abut against the rod body of the folding rod.

[0039] Through the above design, the feed channel can limit the material strip 4 in the vertical direction, so that the material strip 4 located between the material transfer clamp 71 and the progressive die is not prone to warping; when the material transfer clamp 71 is close to the progressive die, the folding rods can be contracted together, and when the material transfer clamp 71 is away from the progressive die, the folding rods can be unfolded together, so that the feed channel can cooperate with the movement of the material transfer clamp 71 to produce or shorten, thereby ensuring that the material strip 4 can be limited by the feed channel during the movement of the material transfer clamp 71.

[0040] Specifically, the material transferring clamp 71 includes two upper and lower clamping plates, one end of the upper folding rod is hinged to the protective plate 5 by a ball hinge, and the other end of the folding rod is hinged to the upper clamping plate; one end of the lower folding rod is hinged to the lower mold 1 by a ball hinge, and the other end of the folding rod is hinged to the lower clamping plate; when the material transferring clamp 71 approaches the lower mold 1, the upper and lower clamping plates will approach each other and drive the upper and lower folding rods to approach each other to abut the material strip 4; when the material transferring clamp 71 moves away from the lower mold 1, the upper and lower clamping plates will move away from each other, at this time, the upper folding rod will rotate upward with itself and the hinge of the protective plate 5 as the center, and the lower folding rod will rotate downward with itself and the hinge of the lower mold 1 as the center, so that the folding rod can be driven to shrink or expand through the material transferring clamp 71.

[0041] Figure 3 is along Figure 2 A schematic cross-sectional view taken along the AA direction, in which only part of the lower die and part of the material transfer clamp are shown. Figure 2 and Figure 3 The folding rod includes a pair of rotating rods 61 and a hinge shaft 62. The rod bodies of the pair of rotating rods 61 can abut against the material belt 4. The end of one of the pair of rotating rods 61 is connected with the hinge shaft 62, and the end of the other of the pair of rotating rods 61 is provided with a connecting ear 63. One end of the hinge shaft 62 is connected to the rotating rod 61, and the other end of the hinge shaft 62 extends in a direction away from the feed channel and is provided with a threaded section for threading a nut at this end. The connecting ear 63 can be sleeved on the hinge shaft 62 and abut against the nut.

[0042] Through the above design, the two rotating rods 61 can be hinged by the hinge shaft 62 and the connecting ear 63, and the rod body of the folding rod can form a flat abutment surface, so that the material strip 4 located in the feed channel will not warp when abutting against the abutment surface, thereby ensuring that the subsequent progressive die processing of the material strip 4 will not occur because the material strip 4 is warped before entering the mold, and this part of the warped material strip 4 will collide with the inner wall of the limiting channel when entering the limiting channel, thereby making it impossible for the material strip 4 on the mold to move to the predetermined processing position, resulting in stamping misalignment.

[0043] See also Figure 1 and Figure 2A plurality of guide posts 21 are arranged at intervals on the end face of the upper die 2 facing the lower die 1, and a plurality of positioning holes 12 are arranged on the end face of the lower die 1 facing the upper die 2. The number of guide posts 21 and the positioning holes 12 are the same, and each guide post 21 corresponds to a positioning hole 12. When the upper die 2 and the lower die 1 are assembled, each guide post 21 can be inserted into the corresponding positioning hole 12, so that the upper die 2 and the lower die 1 can be guided by the cooperation of the guide posts 21 and the positioning holes 12, so that when the upper die 2 and the lower die 1 are assembled, there will be no skewing or other assembly errors, thereby ensuring that the progressive die can correctly process the material strip 4.

[0044] Specifically, a ball sleeve 13 may be provided in each positioning hole 12. When the upper mold 2 and the lower mold 1 are assembled, each guide column 21 can be inserted into the ball sleeve 13 in the corresponding positioning hole 12, so that the friction between the column body of the guide column 21 and the inner wall of the ball sleeve 13 can be reduced by the balls provided on the inner wall of the ball sleeve 13, thereby facilitating the guide column 21 to be inserted into or pulled out of the ball sleeve 13.

[0045] See also Figure 1 and Figure 2 A blanking hole 111 is provided at the bottom of the die groove 11, one side of the blanking hole 111 is connected to the die groove 11, and the other side is connected to the outside through the side wall of the lower die 1, so that the waste or finished product punched out from the material strip 4 by the punch head can leave the die groove 11 through the blanking hole 111, so that these waste and finished products can automatically leave the progressive die, thereby realizing continuous processing of the material strip 4 and collection of products and waste.

[0046] The working principle of the progressive die for preventing the material strip 4 from warping in the present application is as follows:

[0047] The present invention comprises a lower mould 1, an upper mould 2 and a limiting assembly 3, wherein the lower mould 1 is suitable for receiving the material strip 4, the upper mould 2 is suitable for being assembled with the lower mould 1 and forming a forming cavity for processing the material strip 4 therebetween, and a plurality of workstations are arranged in sequence along the moving direction of the material strip 4 in the forming cavity, the limiting assembly 3 is arranged on the lower mould 1 and a limiting channel is formed therebetween, the material strip 4 can pass through the limiting channel and abut against the inner wall of the limiting channel, so that the material strip 4 located on the lower mould 1 is not easy to warp, thereby avoiding the situation that due to the warping of a part of the material strip 4 located on the lower mould 1, another part of the material strip 4 located on the lower mould 1 does not move to the workstation to which it should move along the moving direction of the material strip 4, thereby causing these misplaced material strips 4 to be damaged or wasted.

[0048] It should be noted that the above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A progressive die for preventing strip warping, used for processing strips, characterized in that: include: A lower mold (1), an upper mold (2) and a limiting assembly (3), wherein the lower mold (1) is suitable for receiving the material strip (4), and the upper mold (2) is suitable for being assembled with the lower mold (1) to form a molding cavity for processing the material strip (4) between the two. A plurality of workstations are sequentially arranged in the molding cavity along the moving direction of the material strip (4). The limiting assembly (3) is arranged on the lower mold (1) and forms a limiting channel between the two. The material strip (4) can pass through the limiting channel and abut against the inner wall of the limiting channel.

2. A progressive die for preventing strip warping according to claim 1, characterized in that: A plurality of groups of punch heads are arranged on one side end surface of the upper die (2) facing the lower die (1) along the moving direction of the material strip (4); a plurality of groups of die grooves (11) are arranged on one side end surface of the lower die (1) facing the upper die (2); the number of the groups of punch heads and the number of the groups of die grooves (11) are consistent and correspond one to one; when the upper die (2) and the lower die (1) are assembled, each group of the punch heads can cooperate with a corresponding group of the die grooves (11) to process the material strip (4); The limiting assembly (3) comprises a plurality of pairs of limiting members, wherein the plurality of pairs of limiting members are arranged on one side end surface of the lower die (1) facing the upper die (2), and the plurality of pairs of limiting members are arranged in two rows along the moving direction of the material strip (4), and each pair of limiting members are symmetrically arranged with the central axis of the lower die (1) along the length direction as the symmetry axis, and a limiting protrusion is provided on the top of each limiting member, and the limiting channel is formed between the limiting protrusion and the one side end surface of the lower die (1) facing the upper die (2).

3. A progressive die for preventing strip warping according to claim 2, characterized in that: It also includes a protective plate (5), and a pair of limiting members are provided on one side of the lower mold (1) close to the feeding device (7), the bottom of the protective plate (5) is connected to the top of the pair of limiting members, and the plate surface of the protective plate (5) is perpendicular to the moving direction of the material belt (4).

4. A progressive die for preventing strip warping according to claim 3, characterized in that: It also includes an auxiliary limiting assembly (6), the auxiliary limiting assembly (6) being arranged between the material transfer clamp (71) of the feeding device (7) and the lower mold (1), the auxiliary limiting assembly (6) comprising a pair of folding rods arranged opposite to each other up and down, a feeding channel being formed between the rod bodies of the pair of folding rods, and the material belt (4) being able to pass through the feeding channel and abut against the folding rods; One end of the folding rod located at the top is hinged to the protective plate (5), and the other end of the folding rod is hinged to the material transfer clamp (71); One end of the folding rod located below is hinged to the lower mold (1), and the other end of the folding rod is also hinged to the material transfer clamp (71). When the material transfer clamp (71) approaches the lower mold (1), the pair of folding rods can fold and shorten the feed channel. When the material transfer clamp (71) moves away from the lower mold (1), the pair of folding rods can unfold and lengthen the feed channel.

5. A progressive die for preventing strip warping according to claim 4, characterized in that: The folding rod comprises a pair of rotating rods (61) and a hinge shaft (62); the rod bodies of the pair of rotating rods (61) are both capable of abutting against the material belt (4); the end of one of the pair of rotating rods (61) is connected to the hinge shaft (62); and the end of the other of the pair of rotating rods (61) is provided with a connecting ear (63); One end of the hinge shaft (62) is connected to the rotating rod (61), and the other end of the hinge shaft (62) extends in a direction away from the feed channel and is provided with a threaded section for screwing a nut at the end, and the connecting ear (63) can be sleeved on the hinge shaft (62) and abut against the nut.

6. A progressive die for preventing strip warping according to claim 1, characterized in that: A plurality of guide posts (21) are arranged at intervals on an end surface of one side of the upper mold (2) facing the lower mold (1), and a plurality of positioning holes (12) are arranged on an end surface of one side of the lower mold (1) facing the upper mold (2). The number of the guide posts (21) and the positioning holes (12) are the same and correspond one to one. When the upper mold (2) and the lower mold (1) are assembled, each guide post (21) can be inserted into the corresponding positioning hole (12).

7. A progressive die for preventing strip warping according to claim 6, characterized in that: A ball sleeve (13) is provided in each of the positioning holes (12), and when the upper mold (2) and the lower mold (1) are assembled, each of the guide columns (21) can be inserted into the ball sleeve (13) in the corresponding positioning hole (12).

8. A progressive die for preventing strip warping according to claim 2, characterized in that: The bottom of the die groove (11) is provided with a blanking hole (111) leading to the outside, and the material punched out from the material strip (4) by the punch head can leave the die groove (11) through the blanking hole (111).

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