Composite stamping tool

Abstract

The utility model relates to the technical field of stamping dies, in particular to a composite stamping tool which is used for stamping an inner hole of a connecting terminal on a material belt, the connecting terminal comprises a connecting terminal body, an inner hole formed in the body in the extending direction of the body and an extending part extending into the inner hole, and the tool is composed of an upper die assembly, a lower die assembly and an ejector assembly. The upper die assembly is located at the upper end of the lower die assembly, the section of the ejector assembly corresponds to the outer edge of the inner hole and is provided with a through groove corresponding to an extending part, the ejector assembly is divided into an upper ejector and a lower ejector, the upper ejector is movably installed on the upper die assembly, the lower ejector is elastically installed on the lower die assembly in a floating mode and is axially opposite to the lower die assembly, one end of the lower ejector is provided with a protruding part, and the upper ejector corresponds to a notch part. When the inner hole is punched, the upper jacking piece and the lower jacking piece sequentially punch the material belt, stress release of the material belt is guaranteed, and the extension part is prevented from being damaged. After stamping is completed, waste materials are pressed back to the material belt, completeness of the material belt is guaranteed, extension parts are prevented from being damaged in subsequent procedures, the yield of the connecting ends is improved, and production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a composite stamping tool. Background Art

[0002] With the rapid development of modern industry, stamping technology has become crucial in the manufacturing industry. Stamping is a metalworking method that uses a punch press and a die to form metal sheets into various shaped parts. Currently, connectors are widely used in a wide range of fields, including electronic equipment, communications equipment, automotive electronics, and power systems. In electronic equipment, connectors are used to achieve reliable connections between circuit boards and electronic components; in communications equipment, connectors ensure stable signal transmission; and in the automotive electronics field, connectors provide reliable electrical connections for various electronic systems in a vehicle.

[0003] like Figure 1 、 2 As shown in , 3 , the corresponding connecting terminal 1 of the present application includes: a connecting terminal body 11, an inner hole 10 is provided on the connecting terminal body 11 and extends along the extension direction of the connecting terminal body 11, and an extension 12 is provided on the connecting terminal body 11, and the extension 12 extends into the inner hole 10 along the extension direction of the connecting terminal body 11; for this type of connecting terminal, a composite stamping tool is usually used for production, but during the stamping process, since the size of the extension 12 on the connecting terminal body 11 is small and thin, if the traditional production process is used, during the stamping process, it is easy to cause the connection point between the extension 12 and the connecting terminal body 11 to break or the extension 12 to deform or even break, resulting in the scrapping of the connecting terminal 1, which increases the production cost of the connecting terminal 1. Therefore, a composite stamping tool is needed to improve the yield of the connecting terminal 1 and reduce the production cost of the connecting terminal 1. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a composite stamping tool, which solves the technical problems of fracture of the connection point between the extension and the connecting terminal body, deformation or even breakage of the extension, and high production cost of the connecting terminal.

[0005] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0006] A composite stamping tool is used to stamp out an inner hole on a connecting terminal from a material strip, wherein the connecting terminal comprises: a connecting terminal body, the inner hole being provided on the connecting terminal body and extending along an extension direction of the connecting terminal body, an extension portion being provided on the connecting terminal body, the extension portion extending into the inner hole along the extension direction of the connecting terminal body;

[0007] The cam is provided with a plurality of grooves, and the grooves extend along the axial direction of the cam, and the cross-sectional shape of the grooves corresponds to the shape of the extension. The cam comprises an upper top piece and a lower top piece. The upper top piece is movably mounted on the upper mold assembly, and the lower top piece is elastically floatingly mounted on the lower mold assembly. The upper and lower top pieces are axially opposite to each other. The lower top piece is provided with a convex portion at one end near the upper mold assembly, and a notch corresponding to the convex portion at one end near the lower mold assembly. In the process of punching out the inner hole, the convex portion and the notch cooperate axially to press the waste material back onto the material strip.

[0008] Based on the above structure, the principle of the composite stamping tool is: first, the material strip is fed into the composite stamping tool, and the material strip is located between the upper mold assembly and the lower mold assembly. At this time, the end of the convex portion near the upper mold assembly is flush with the end face of the lower mold assembly near the upper mold assembly. Then, the upper ejector begins to move axially in the direction close to the lower mold assembly until it fits with the material strip. The upper ejector continues to move axially in the direction close to the lower mold assembly to a preset stroke. At this time, the waste material has been stamped and separated from the material strip. Since the lower ejector is provided with a convex portion at one end near the upper mold assembly and a notch corresponding to the convex portion at one end near the lower mold assembly, the waste material corresponding to this area is not stamped and separated from the material strip. Then, the upper ejector retracts until the end face of the upper ejector near the lower mold assembly is flush with the end face of the upper mold assembly near the lower mold assembly. After that, the lower ejector moves axially in the direction close to the upper mold assembly to a preset stroke. During this process, the lower ejector near one end of the upper die assembly pushes the waste back to the material strip, and the convex part extends into the notch. With the cooperation of the upper die assembly, the convex part punches and separates the waste material in the area that has not been separated from the material strip from the material strip. Finally, because the lower ejector is elastically floatingly installed on the lower die assembly, the lower ejector retracts and resets, and the upper ejector is also reset at the same time. Under the action of the conveyor, the material strip is moved out of the stamping area, and the waste material is taken away from the stamping area by the material strip and then enters the next process; during the stamping process, the waste material is taken out of the composite stamping tooling by the material strip, which reduces the discharge time and improves the stamping speed. The inner hole area is stamped for the second time to ensure that the stress of the material strip is released when it is stamped by the ejector assembly, avoiding deformation or even breakage of the extension; the waste material is pressed back onto the material strip again to ensure the integrity of the material strip, so as to ensure that the extension will not be deformed or damaged in subsequent processes.

[0009] Furthermore, in a composite stamping tool of the present application, a blade is provided on one end of the lower die assembly near the upper die assembly, the shape and size of the blade corresponding to the end of the extension, and the blade protrudes from the end face of the lower die assembly near the upper die assembly. As a preferred embodiment of the present application, the blade in a composite stamping tool of the present application, during the stamping process, first contacts the material strip and performs punching, which can make the stamping process more stable and precise; at the same time, the shape and size of the blade correspond to the end of the extension, which can better control the fracture position of the material strip and the waste material and the quality of the punched surface, so as to ensure that the extension does not deform during the stamping process.

[0010] Furthermore, in a composite stamping tool in the present application, a limiting portion is provided on the upper die assembly, the limiting portion is provided on the side of the upper die assembly away from the lower die assembly, and the limiting portion extends along the radial direction of the upper die assembly. As a preferred embodiment of the present application, the limiting portion in a composite stamping tool in the present application is used to limit the position of the upper die assembly when it is installed on the die base, and to lock the upper die assembly on the die base. This design is so that when the upper die assembly is damaged, the upper die assembly can be directly replaced without replacing the entire die base, thereby improving the economy of the stamping tool.

[0011] Furthermore, in a composite stamping tool of the present application, the lower die assembly includes: a first die base, a second die base, and a movable block. The first die base is provided at the lower end of the upper die assembly, the lower ejector is provided on the first die base, the second die base is installed on the side of the first die base away from the upper die assembly, a movable cavity is provided in the second die base, the movable block is elastically floatingly provided in the movable cavity, and the end of the lower ejector away from the upper die assembly conflicts with the movable block. As a preferred embodiment of the present application, in a composite stamping tool of the present application, the first die base and the second die base are designed to be separated in order to facilitate the installation, disassembly and replacement of the movable block, and the movable block is used to push the lower ejector to press the waste material onto the return belt.

[0012] Furthermore, in a composite stamping tool of the present application, a limiting protrusion is provided on one end of the lower ejector extending away from the upper die assembly, and the limiting protrusion is used to limit the travel of the lower ejector toward the upper die assembly. As a preferred embodiment of the present application, in a composite stamping tool of the present application, when the lower ejector moves toward the upper die assembly until the end face of the limiting protrusion near the upper die assembly mates with the end face of the first die base away from the upper die assembly, the limiting protrusion limits the lower ejector to prevent the lower ejector from damaging the material strip and the extension.

[0013] Furthermore, in a composite stamping tooling in the present application, the first die base includes: a first assembly die base and a second assembly die base, the first assembly die base and the second assembly die base are arranged at the lower end of the upper die assembly, the first assembly die base and the second assembly die base are radially assembled at the lower top piece and covered on the outer side of the lower top piece, the first assembly die base is provided with a first limiting protrusion, and the second assembly die base is provided with a second limiting protrusion corresponding to the first limiting protrusion, the first limiting protrusion and the second limiting protrusion are respectively located on the corresponding fitting surfaces of the first assembly die base and the second assembly die base, when the first assembly die base and the second assembly die base are radially assembled at the lower top piece, the end face of the first limiting protrusion away from the upper die assembly and the end face of the second limiting protrusion close to the upper die assembly are axially fitted on the lower top piece. As a preferred solution of the present application, a composite stamping tooling of the present application, the first assembly die base and the second assembly die base adopt a split design. Such a design facilitates the processing of the first die base, and also facilitates the replacement of the first assembly die base and the second assembly die base when they are damaged; the first limiting protrusion and the second limiting protrusion cooperate with each other to facilitate the assembly and limiting of the first assembly die base and the second assembly die base.

[0014] Furthermore, a composite stamping tool in the present application further includes: an elastic member, a group of first recesses is provided on the side of the movable block away from the upper die assembly, a group of second recesses corresponding to the group of first recesses is provided on the side of the second die base close to the upper die assembly, a group of the first recesses is arranged opposite to a group of the second recesses, the number of the first recesses and the second recesses respectively corresponds to the number of the elastic members, the first recesses and the second recesses respectively accommodate the two ends of the elastic member, and the two ends of the elastic member are respectively connected to the corresponding second die base and the movable block. As a preferred embodiment of the present application, the first recess and the second recess in a composite stamping tool in the present application respectively accommodate the two ends of the elastic member and limit the elastic member axially and radially; when the movable block moves toward the upper die assembly, the elastic member deforms and lengthens, and the elastic member pushes the lower ejector to move toward the upper die assembly. When the lower ejector reaches a preset stroke, the movable block stops moving toward the upper die assembly. Under the action of the elastic member, the movable block is reset, and the lower ejector also retracts to the preset position.

[0015] Furthermore, the composite stamping tool of the present application further includes: a pair of mutually perpendicular side panels, wherein two mutually perpendicular inner side surfaces of the pair of side panels are respectively aligned with two adjacent side surfaces of the lower die assembly. As a preferred embodiment of the present application, the pair of side panels in the composite stamping tool of the present application are used to facilitate adjustment of the installation gap between the lower die assembly and the die base, and also to ensure stability between the die bases.

[0016] Furthermore, a composite stamping tool in the present application further includes: a drive column, the drive column being disposed on a side of the movable block away from the upper die assembly, with an end of the drive column proximal to the upper die assembly abutting against a side of the movable block away from the upper die assembly. As a preferred embodiment of the present application, a composite stamping tool in the present application has an end of the drive column away from the upper die assembly connected to a drive mechanism, driving the movable block to push the lower ejector axially.

[0017] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0018] A composite stamping tool in the present application is characterized in that an upper ejector piece is installed on an upper die assembly and a lower ejector piece is installed on a lower die assembly. During the process of punching out an inner hole, the upper ejector piece and the lower ejector piece sequentially punch the material strip, thereby ensuring that the stress of the material strip is released when being punched by the ejector piece assembly, thereby avoiding damage to the extension portion caused by a single punching. After the punching of the inner hole is completed, the waste material is re-pressed on the material strip, thereby ensuring the integrity of the material strip, avoiding damage to the extension portion caused by subsequent steps during the stamping of the connection terminal body, thereby improving the yield rate of the connection terminal, and reducing the production cost of the connection terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a plan view of a connection terminal corresponding to a composite stamping tool in an embodiment of the present application;

[0020] Figure 2 This is a cross-sectional view of a connection terminal corresponding to a composite stamping tool in an embodiment of the present application;

[0021] Figure 3 This is a plan view of a material strip corresponding to a composite stamping tool in an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of a three-dimensional structure of a composite stamping tool in an embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of an upper die assembly of a composite stamping tool in an embodiment of the present application;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of a lower die assembly of a composite stamping tool in an embodiment of the present application;

[0025] Figure 7 This is an exploded top view of a lower die assembly of a composite stamping tool in an embodiment of the present application;

[0026] Figure 8 This is an exploded bottom view of a lower die assembly of a composite stamping tool in an embodiment of the present application.

[0027] In the figure: 1-connecting terminal; 10-inner hole; 11-connecting terminal body; 12-extension; 2-upper mold assembly; 21-limiting part; 3-lower mold assembly; 31-first mold base; 311-first assembly mold base; 3111-first limiting convex part; 312-second assembly mold base; 3121-second limiting convex part; 32-second mold base; 320-movable cavity; 321-second recess; 33-movable block; 330-first recess; 4-top piece assembly; 40-through groove; 41-upper top piece; 411-notch; 42-lower top piece; 421-convex part; 422-limiting convex; 5-blade; 6-elastic member; 7-side plate; 8-driving column. DETAILED DESCRIPTION

[0028] A composite stamping tool is used to stamp out an inner hole 10 on a material strip for a connecting terminal 1. The connecting terminal 1 includes: a connecting terminal body 11, the inner hole 10 is provided on the connecting terminal body 11 and extends along the extension direction of the connecting terminal body 11, and an extension portion 12 is provided on the connecting terminal body 11. The extension portion 12 extends into the inner hole 10 along the extension direction of the connecting terminal body 11;

[0029] The cam 42 is provided with a plurality of grooves 41 and a plurality of grooves 42 arranged on the top of the cam 42 so as to form a plurality of grooves 42 connected to the cam 42. The cam 42 is provided with a plurality of grooves 41 and a plurality of grooves 42 connected to the cam 42.

[0030] Based on the above structure, the principle of the composite stamping tool is as follows: first, the material strip is fed into the composite stamping tool, and the material strip is located between the upper die assembly 2 and the lower die assembly 3. At this time, the end of the convex portion 421 near the upper die assembly 2 is flush with the end surface of the lower die assembly 3 near the upper die assembly 2. Then, the upper ejector 41 begins to move axially toward the lower die assembly 3 until it fits with the material strip. The upper ejector 41 continues to move axially toward the lower die assembly 3 to a preset stroke. At this time, the waste The material (not shown) has been stamped and separated from the material strip. Since the lower ejector 42 is provided with a convex portion 421 at one end near the upper mold assembly 2 and the upper ejector 41 is provided with a notch 411 corresponding to the convex portion 421 at one end near the lower mold assembly 3, the waste material corresponding to this area is not stamped and separated from the material strip. Then, the upper ejector 41 retracts until the end surface of the upper ejector 41 on the side near the lower mold assembly 3 is flush with the end surface of the upper mold assembly 2 on the side near the lower mold assembly 3. After that, the lower ejector 42 moves axially in the direction close to the upper mold assembly 2. The lower ejector 42 moves to the preset stroke. During this process, the lower ejector 42 near one end of the upper die assembly 2 pushes the waste back to the material strip, and the convex portion 421 extends into the notch 411. The convex portion 421, in cooperation with the upper die assembly 2, punches and separates the waste that has not been separated from the material strip in the area. Finally, because the lower ejector 42 is elastically floatingly mounted on the lower die assembly 3, the lower ejector 42 retracts and resets, and the upper ejector 41 also resets at the same time. Under the action of the conveying device (not shown), the material strip is moved out of the stamping area. In the stamping area, the waste is taken away from the stamping area by the material belt and then enters the next process; during the stamping process, the waste is taken out of the composite stamping tooling by the material belt, which reduces the discharge time and improves the stamping speed. The inner hole 10 area is stamped twice to ensure that the stress of the material belt is released when it is stamped by the top piece assembly 4, avoiding deformation or even breakage of the extension 12; the waste is pressed back onto the material belt to ensure the integrity of the material belt, so as to ensure that the extension 12 will not be deformed or damaged in subsequent processes. The upper mold assembly 2 is provided with three upper ejectors 41, corresponding to the feeding direction of the material belt, and a group of the upper ejectors 41 are evenly spaced in the feeding direction of the material belt. Correspondingly, the lower mold assembly 3 is provided with three lower ejectors 42 corresponding to the upper ejectors 41.

[0031] like Figure 6 As shown, in this embodiment, a blade portion 5 is provided on the end of the lower die assembly 3 near the upper die assembly 2. The shape and size of the blade portion 5 correspond to the end of the extension 12, and the blade portion 5 protrudes from the end surface of the lower die assembly 3 near the upper die assembly 2. During the stamping process, the blade portion 5 first contacts the material strip and performs the punching, which makes the stamping process more stable and precise. At the same time, the shape and size of the blade portion 5 correspond to the end of the extension 12. This can better control the fracture position of the material strip and the waste material and the quality of the punched surface, thereby ensuring that the extension 12 does not deform during the stamping process.

[0032] like Figure 5As shown, in this embodiment, the upper mold assembly 2 is provided with a limiting portion 21. The limiting portion 21 is located on the side of the upper mold assembly 2 away from the lower mold assembly 3 and extends radially along the upper mold assembly 2. The limiting portion 21 is used to limit the position of the upper mold assembly 2 when it is installed on the mold base (not shown), locking the upper mold assembly 2 on the mold base. This design allows the upper mold assembly 2 to be directly replaced when damaged, without having to replace the entire mold base, thereby improving the economic efficiency of the stamping tooling. A limiting portion 21 extends radially from the side of the upper mold assembly 2 away from the lower mold assembly 3. Correspondingly, the mold base is provided with a mounting notch (not shown) corresponding to the limiting portion 21.

[0033] like Figure 7 、 8 As shown, in this embodiment, the lower mold assembly 3 includes: a first mold base 31, a second mold base 32, and a movable block 33. The first mold base 31 is arranged at the lower end of the upper mold assembly 2. The lower ejector 42 is inserted into the first mold base 31. The second mold base 32 is installed on the side of the first mold base 31 away from the upper mold assembly 2. A movable cavity 320 is provided in the second mold base 32. The movable block 33 is elastically floatingly arranged in the movable cavity 320. The end of the lower ejector 42 away from the upper mold assembly 2 abuts against the movable block 33. The first mold base 31 and the second mold base 32 are designed to be separate to facilitate the installation, removal and replacement of the movable block 33. The movable block 33 is used to push the lower ejector 42 to press the waste material onto the return belt.

[0034] In this embodiment, a stopper protrusion 422 extends from the end of the lower ejector 42 away from the upper mold assembly 2. This stopper protrusion 422 is used to limit the travel of the lower ejector 42 toward the upper mold assembly 2. When the lower ejector 42 moves toward the upper mold assembly 2 until the end surface of the stopper protrusion 422 proximal to the upper mold assembly 2 abuts the end surface of the first mold base 31 distal to the upper mold assembly 2, the stopper protrusion 422 restrains the lower ejector 42, preventing it from damaging the material strip and extension 12. The stopper protrusion 422 is located on the side opposite the side where the through slot 40 is located.

[0035] In this embodiment, the first mold base 31 includes: a first assembly mold base 311 and a second assembly mold base 312. The first assembly mold base 311 and the second assembly mold base 312 are arranged at the lower end of the upper mold assembly 2. The first assembly mold base 311 and the second assembly mold base 312 are radially assembled in the lower top piece 42 and covered on the outer side of the lower top piece 42. The first assembly mold base 311 is provided with a first limiting protrusion 3111, and the second assembly mold base 312 is provided with a first limiting protrusion 3111. 11 corresponding to the second limiting protrusion 3121, the first limiting protrusion 3111 and the second limiting protrusion 3121 are respectively located on the corresponding fitting surfaces of the first assembly mold base 311 and the second assembly mold base 312. When the first assembly mold base 311 and the second assembly mold base 312 are radially assembled on the lower ejector 42, the end surface of the first limiting protrusion 3111 away from the upper mold assembly 2 and the end surface of the second limiting protrusion 3121 close to the upper mold assembly 2 are axially fitted on the lower ejector 42. The first assembly mold base 311 and the second assembly mold base 312 are designed to be split, which facilitates the processing of the first mold base 31 and also facilitates the replacement of the first assembly mold base 311 and the second assembly mold base 312 when they are damaged. The first limiting protrusion 3111 and the second limiting protrusion 3121 cooperate with each other to facilitate the assembly and limiting of the first assembly mold base 311 and the second assembly mold base 312.

[0036] In this embodiment, it also includes: an elastic member 6, a group of first recesses 330 is provided on the side of the movable block 33 away from the upper mold assembly 2, and a group of second recesses 321 corresponding to the group of first recesses 330 is provided on the side of the second mold base 32 close to the upper mold assembly 2. A group of first recesses 330 and a group of second recesses 321 are arranged opposite to each other, and the number of the first recesses 330 and the second recesses 321 respectively corresponds to the number of the elastic members 6. The first recesses 330 and the second recesses 321 respectively accommodate the two ends of the elastic member 6, and the two ends of the elastic member 6 are respectively connected to the corresponding second mold base 32 and the movable block 33. The first recess 330 and the second recess 321 respectively accommodate the two ends of the elastic member 6 and limit the elastic member 6 axially and radially. When the movable block 33 moves toward the upper mold assembly 2, the elastic member 6 deforms and lengthens, and the elastic member 6 pushes the lower ejector 42 toward the upper mold assembly 2. When the lower ejector 42 reaches the preset stroke, the movable block 33 stops moving toward the upper mold assembly 2. Under the action of the elastic member 6, the movable block 33 is reset, and the lower ejector 42 also retracts to the preset position. The elastic member 6 is a wave spring, and there are two of them. Correspondingly, the number of the first recesses 330 and 321 is two.

[0037] This embodiment also includes a pair of mutually perpendicular side panels 7, the inner side surfaces of which are aligned with adjacent side surfaces of the lower mold assembly 3. The side panels 7 facilitate adjustment of the mounting clearance between the lower mold assembly 3 and the mold base (not shown) and ensure stability between the mold bases.

[0038] This embodiment further includes a drive post 8, which is disposed on the side of the movable block 33 away from the upper mold assembly 2. The end of the drive post 8 near the upper mold assembly 2 abuts against the side of the movable block 33 away from the upper mold assembly 2. The end of the drive post 8 away from the upper mold assembly 2 is connected to a drive mechanism (not shown), which drives the movable block 33 to push the lower ejector 42 axially.

[0039] The above description of the technical principles of the present invention in conjunction with specific embodiments is intended solely to illustrate the principles of the present invention and is not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present invention without inventive effort, and such implementations will fall within the scope of protection of the present invention.

Claims

1. A composite stamping tool for punching out an inner hole (10) on a connecting terminal (1) on a material strip, characterized in that: The connecting terminal (1) comprises: a connecting terminal body (11), the inner hole (10) is provided on the connecting terminal body (11) and extends along the extension direction of the connecting terminal body (11), the connecting terminal body (11) is provided with an extension portion (12), and the extension portion (12) extends into the inner hole (10) along the extension direction of the connecting terminal body (11); The present invention comprises: an upper mold assembly (2), a lower mold assembly (3), and a top piece assembly (4), wherein the upper mold assembly (2) is arranged at the upper end of the lower mold assembly (3), the cross-sectional shape of the top piece assembly (4) corresponds to the outer edge shape of the inner hole (10), the top piece assembly (4) is provided with a through groove (40), the through groove (40) extends along the axial direction of the top piece assembly (4), the cross-sectional shape of the through groove (40) corresponds to the shape of the extension (12), the top piece assembly (4) comprises: an upper top piece (41), a lower top piece (42), the upper top piece (41) is movable The upper ejector (41) and the lower ejector (42) are axially arranged relative to each other, and the lower ejector (42) is provided with a convex portion (421) at one end close to the upper ejector (2), and a notch (411) corresponding to the convex portion (421) at one end close to the lower ejector (3). When the ejector assembly (4) punches out the inner hole (10), the convex portion (421) and the notch (411) are axially matched to press the waste material back onto the material belt.

2. The composite stamping tool according to claim 1, characterized in that: A blade (5) is provided on one end of the lower mold assembly (3) close to the upper mold assembly (2); the shape and size of the blade (5) correspond to the end of the extension (12); and the blade (5) protrudes from the end surface of the lower mold assembly (3) close to the upper mold assembly (2).

3. The composite stamping tool according to claim 1, characterized in that: A limiting portion (21) is provided on the upper die assembly (2), the limiting portion (21) being provided on a side of the upper die assembly (2) away from the lower die assembly (3), and the limiting portion (21) extending along the radial direction of the upper die assembly (2).

4. The composite stamping tool according to claim 1, characterized in that: The lower mold assembly (3) comprises: a first mold base (31), a second mold base (32), and a movable block (33); the first mold base (31) is arranged at the lower end of the upper mold assembly (2); the lower ejector (42) is passed through the first mold base (31); the second mold base (32) is installed on a side of the first mold base (31) away from the upper mold assembly (2); a movable cavity (320) is provided in the second mold base (32); the movable block (33) is elastically floated in the movable cavity (320); and the end of the lower ejector (42) away from the upper mold assembly (2) contacts the movable block (33).

5. The composite stamping tool according to claim 1, characterized in that: A limiting protrusion (422) is provided on one end of the lower ejector (42) extending away from the upper die assembly (2). The limiting protrusion (422) is used to limit the travel of the lower ejector (42) in a direction approaching the upper die assembly (2).

6. The composite stamping tool according to claim 4, characterized in that: The first mold base (31) comprises: a first assembly mold base (311) and a second assembly mold base (312). The first assembly mold base (311) and the second assembly mold base (312) are arranged at the lower end of the upper mold assembly (2). The first assembly mold base (311) and the second assembly mold base (312) are radially assembled on the lower top piece (42) and covered on the outer side of the lower top piece (42). The first assembly mold base (311) is provided with a first limiting protrusion (3111), and the second assembly mold base (312) is provided with a first limiting protrusion (3111). The first and second limiting convex portions (3121) are respectively located on the corresponding fitting surfaces of the first and second assembling die bases (311 and 312), and when the first and second assembling die bases (311 and 312) are radially assembled on the lower ejector (42), the end surface of the first limiting convex portion (3111) away from the upper die assembly (2) and the end surface of the second limiting convex portion (3121) close to the upper die assembly (2) are axially fitted on the lower ejector (42).

7. The composite stamping tool according to claim 4, characterized in that: Also includes: The elastic member (6) is provided with a group of first recesses (330) on the side of the movable block (33) away from the upper mold assembly (2), and the second mold base (32) is provided with a group of second recesses (321) corresponding to the group of first recesses (330) on the side close to the upper mold assembly (2). The group of first recesses (330) and the group of second recesses (321) are arranged opposite to each other, and the number of the first recesses (330) and the second recesses (321) respectively corresponds to the number of the elastic members (6). The first recesses (330) and the second recesses (321) respectively accommodate the two ends of the elastic member (6), and the two ends of the elastic member (6) are respectively connected to the corresponding second mold base (32) and the movable block (33).

8. The composite stamping tool according to claim 1, characterized in that: Also includes: A pair of mutually perpendicular side plates (7), wherein two mutually perpendicular inner side surfaces of the pair of side plates (7) are respectively fitted with two adjacent side surfaces of the lower mold assembly (3).

9. The composite stamping tool according to claim 4, characterized in that: Also includes: A driving column (8) is provided on a side of the movable block (33) away from the upper die assembly (2), and an end of the driving column (8) close to the upper die assembly (2) abuts against a side of the movable block (33) away from the upper die assembly (2).

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