Aluminum rivet multi-station cold heading die

Abstract

The utility model discloses a kind of aluminium rivet multi-station cold heading die, it is related to cold heading die technical field.It includes first forming die, second forming die, third forming die, fourth forming die and blanking die sequentially arranged from left to right along blank feeding direction;First forming die is used to carry out preliminary extrusion to the front end of blank, and preliminary extrusion is carried out to the rear end of blank;Second forming die is used to carry out second extrusion to the front end and rear end of blank to realize upsetting;Third forming die is used to carry out third extrusion to the front end and rear end of blank to realize upsetting;Fourth forming die is used to carry out fourth extrusion to the front end of blank to realize upsetting;Blanking die is used to carry out shearing to the front end of blank to separate out the product of required shape and size.The utility model forms aluminium rivet by cold heading process step by step, material utilization is high, improve production efficiency, and product size consistency is good.

Description

Technical Field

[0001] This utility model relates to the field of cold heading mold technology, and in particular to a multi-station cold heading mold for aluminum rivets. Background Technology

[0002] Aluminum rivets are mechanical fasteners made primarily of aluminum alloy. They typically consist of a disc-shaped rivet head and a columnar rivet shank, and are clamped and fixed by deformation or interference fit. Currently, when aluminum rivets are machined using multi-axis machining methods, i.e., cutting methods, the following defects exist: (1) Significant material waste: During bar cutting, most of the material is processed into chips, resulting in low material utilization and high material costs; (2) Dispersed processes: Multiple processes, such as turning the shank and milling the head, need to be completed sequentially, resulting in low production efficiency and accumulated clamping and positioning errors, leading to poor dimensional consistency. Therefore, it is necessary to provide a multi-station cold heading mold for machining aluminum rivets. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a multi-station cold heading mold for aluminum rivets, which forms aluminum rivets in steps through the cold heading process, resulting in high material utilization, improved production efficiency, and good product dimensional consistency.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A multi-station cold heading die for aluminum rivets includes a first forming die, a second forming die, a third forming die, a fourth forming die, and a blanking die arranged sequentially from left to right along the blank feeding direction. The first forming die is used to initially compress the front end of the blank to form a shape close to the head of the aluminum rivet, and to initially compress the rear end of the blank to reduce the diameter and form the rivet shank. The second forming die is used to perform a second compression on the front and rear ends of the blank to achieve upsetting. The third forming die is used to perform a third compression on the front and rear ends of the blank to achieve upsetting. The fourth forming die is used to perform a fourth compression on the front end of the blank to achieve upsetting. The blanking die is used to shear the front end of the blank to separate products of the required shape and size.

[0006] In some embodiments, the first forming die includes a first punch and a first die. The first punch includes a first punch bar with a circular working surface. The first die includes a first hollow main die, a first front die core, a first rear die core, a first hexagon socket screw, and a first ejector pin. The first front die core and the first rear die core are frustum-shaped and coaxially disposed within the first hollow main die. The first front die core has a cylindrical first head extrusion cavity along the axial direction. The first rear die core has a cylindrical first rod extrusion cavity along the axial direction. The front part of the first rod extrusion cavity has a chamfered cavity. The first hexagon socket screw is installed in the rear part of the first hollow main die and is used to limit the first front die core and the first rear die core. The first ejector pin is movable back and forth and passes through the first rod extrusion cavity and the first head extrusion cavity to hold the blank.

[0007] In some embodiments, the second forming mold includes a second punch and a second die. The second punch includes a second punch bar with a circular working surface. The second die includes a second hollow main mold, a second front mold core, a second rear mold core, a second hexagon socket screw, and a second ejector pin. The second front mold core and the second rear mold core are frustum-shaped and coaxially disposed within the second hollow main mold. The second front mold core has a cylindrical second head extrusion cavity along the axial direction. The second rear mold core has a cylindrical second rod extrusion cavity along the axial direction. The front part of the second rod extrusion cavity has a spherical cavity. The second hexagon socket screw is installed in the rear part of the second hollow main mold and is used to limit the second front mold core and the second rear mold core. The second ejector pin is movable back and forth and passes through the second rod extrusion cavity and the second head extrusion cavity to hold the blank.

[0008] In some embodiments, the third forming die includes a third punch and a third die. The third punch includes a third punch bar with a circular working surface. The third die includes a third hollow main die, a third die core, a third hexagon socket screw, and a third ejector pin. The third die core is frustum-shaped and located inside the third hollow main die. The third die core has a circular groove-shaped third head extrusion die cavity and a cylindrical third rod extrusion die cavity that are connected from front to back along the axial direction. The third hexagon socket screw is installed in the rear part of the third hollow main die and is used to limit the third die core. The third ejector pin is movable back and forth and passes through the third rod extrusion die cavity and the third head extrusion die cavity, and is used to hold the blank.

[0009] In some embodiments, the fourth forming die includes a fourth punch and a fourth die. The fourth punch includes a fourth punch bar with a circular working surface. The fourth die includes a fourth hollow main die, a fourth die core, a fourth hexagon socket screw, and a fourth ejector pin. The fourth die core is frustum-shaped and located inside the fourth hollow main die. The fourth die core has a connected circular groove-shaped fourth head extrusion die cavity and a cylindrical fourth rod extrusion die cavity along the axial direction from front to back. The fourth hexagon socket screw is installed in the rear part of the fourth hollow main die and is used to limit the fourth die core. The fourth ejector pin is movable back and forth and passes through the fourth rod extrusion die cavity and the fourth head extrusion die cavity, and is used to hold the blank.

[0010] In some embodiments, the blanking die includes a fifth punch and a fifth die. The fifth punch includes a fifth punch bar with a rounded rectangular working surface. The fifth die includes a fifth hollow main die, a fifth die core, a fifth hexagon socket screw, and a fifth ejector pin. The fifth die core is frustum-shaped and located inside the fifth hollow main die. The fifth die core has a rounded rectangular blanking inner hole along the axial direction. The fifth hexagon socket screw is installed at the rear of the fifth hollow main die and is used to limit the fifth die core. The fifth ejector pin is movable back and forth and passes through the blanking inner hole to hold the blank.

[0011] In some embodiments, the fifth hexagon socket screw has a through hole located behind the blanking inner hole, and the fifth hexagon socket screw and the fifth hollow main mold have product dropping holes that are perpendicularly connected to the through hole.

[0012] Compared with the prior art, this utility model achieves at least the following beneficial effects:

[0013] This invention employs a multi-step cold upsetting extrusion process to form aluminum rivets. The first forming die initially extrudes the front end of the blank to form a shape resembling the rivet head. The rear end of the blank is then initially extruded to reduce the diameter and form the rivet shank. A second forming die further extrudes both the front and rear ends of the blank for upsetting. A third forming die further extrudes both ends for upsetting, and a fourth forming die further extrudes the front end for upsetting. Finally, a blanking die shears the front end of the blank to separate the product into the desired shape and size. This invention generates no waste during the forming process, resulting in high material utilization, reduced material costs, and a high degree of automation. The blanks from each die are clamped and fed synchronously via a clamping mechanism, saving feeding time, avoiding accumulated positioning errors from multiple manual clamping operations, ensuring good product dimensional consistency, and guaranteeing the quality of the formed product's appearance. Attached Figure Description

[0014] Figure 1 This is a structural diagram of an aluminum rivet product;

[0015] Figure 2This is a top view of an embodiment of this application;

[0016] Figure 3 This is a cross-sectional view of the first die according to an embodiment of this application;

[0017] Figure 4 This is a cross-sectional view of the second die according to an embodiment of this application;

[0018] Figure 5 This is a cross-sectional view of the third die in an embodiment of this application;

[0019] Figure 6 This is a cross-sectional view of the fourth die in an embodiment of this application;

[0020] Figure 7 This is a cross-sectional view of the fifth die in an embodiment of this application;

[0021] Figure 8 This is a front view of the fifth die in an embodiment of this application.

[0022] The diagram is labeled as follows: 1. First forming mold; 11. First punch; 111. First punch; 12. First die; 121. First hollow main mold; 122. First front mold core; 1221. First head extrusion cavity; 123. First rear mold core; 1231. First rod extrusion cavity; 1232. Chamfered cavity; 124. First hex socket screw; 125. First ejector pin; 2. Second forming mold; 21. Second punch; 211. Second punch; 22. Second die; 221. Second hollow main mold; 222. Second front mold core; 2221. Second head extrusion cavity; 223. Second rear mold core; 2231. Second rod extrusion cavity; 2232. Spherical cavity; 224. Second hex socket screw; 225. Second ejector pin; 3. Third forming mold; 31. Third punch; 311. Third punch; 32. First... Three concave dies; 321, third hollow main die; 322, third die core; 3221, third head extrusion die cavity; 3222, third rod extrusion die cavity; 323, third internal hexagon socket screw; 324, third ejector pin; 4, fourth forming die; 41, fourth punch; 411, fourth punch; 42, fourth concave die; 421, fourth hollow main die; 422, fourth die core; 4221, fourth head extrusion die cavity; 4 222. Fourth rod extrusion die cavity; 423. Fourth internal hexagon screw; 424. Fourth ejector pin; 5. Blanking die; 51. Fifth punch; 511. Fifth punch; 52. Fifth die cavity; 521. Fifth hollow main die; 522. Fifth die core; 5221. Blanking inner hole; 523. Fifth internal hexagon screw; 5231. Through hole; 524. Fifth ejector pin; 6. Product drop hole; 7. Product; 8. Blank. Detailed Implementation

[0023] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of this application more complete and to fully convey the concept of the present application to those skilled in the art.

[0024] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] like Figures 2-8 As shown in the embodiment of this application, the multi-station cold heading die for aluminum rivets includes a first forming die 1, a second forming die 2, a third forming die 3, a fourth forming die 4, and a blanking die 5 arranged sequentially from left to right along the feeding direction of the blank 8. These are used for processing materials such as… Figure 1 The aluminum rivet product 7 shown uses a cold heading die consisting of a first forming die 1, a second forming die 2, a third forming die 3, and a fourth forming die 4 to perform step-by-step cold extrusion forming of the cylindrical blank 8. A blanking die 5 is used to shear the blank 8, separating the product 7 from the waste. Specifically, the first forming die 1 performs preliminary extrusion on the front end of the blank 8 to form a shape similar to the head of the aluminum rivet, and performs preliminary extrusion on the rear end of the blank 8 to reduce the diameter and form the rivet shank. The second forming die 2 performs a second extrusion on the front and rear ends of the blank 8 to achieve upsetting. The third forming die 3 performs a third extrusion on the front and rear ends of the blank 8 to achieve upsetting. The fourth forming die 4 performs a fourth extrusion on the front end of the blank 8 to achieve upsetting. The blanking die 5 is used to shear the front end of the blank 8 to separate the product 7 into the desired shape and size.

[0026] refer to Figure 2 and Figure 3 The first forming mold 1 includes a first punch 11 and a first die 12. The first punch 11 includes a first ram 111, the working surface of which is circular. The first die 12 includes a first hollow main mold 121, a first front mold core 122, a first rear mold core 123, a first hexagon socket screw 124, and a first ejector pin 125. The first front mold core 122 and the first rear mold core 123 are frustum-shaped and coaxially disposed within the first hollow main mold 121. The first hollow main mold 121 has tapered mounting holes that match the first front mold core 122 and the first rear mold core 123. The first front mold core 122 is square along its axis. A cylindrical first head extrusion die cavity 1221 is provided. A cylindrical first rod extrusion die cavity 1231 is provided along the axial direction on the first rear die core 123. A chamfered die cavity 1232 is provided at the front of the first rod extrusion die cavity 1231. A first internal hexagon screw 124 is installed in the rear of the first hollow main die 121 and is used to limit the first front die core 122 and the first rear die core 123. A first ejector pin 125 is movable back and forth and passes through the first rod extrusion die cavity 1231 and the first head extrusion die cavity 1221. It is used to hold the blank 8. The first ejector pin 125 is connected to a power device such as a spring. The inner diameter of the first head extrusion die cavity 1221 is larger than the diameter of the cylindrical blank 8, and the inner diameter of the first rod extrusion die cavity 1231 is smaller than the diameter of the cylindrical blank 8. Thus, when the first punch 111 pushes the cylindrical blank 8 into the first head extrusion die cavity 1221 and the first rod extrusion die cavity 1231, the first head extrusion die cavity 1221 performs preliminary extrusion on the front end of the cylindrical blank 8 to form a shape close to the head of the aluminum rivet, and the first rod extrusion die cavity 1231 performs preliminary extrusion on the rear end of the blank 8 to reduce the diameter, thereby initially forming the shape of the aluminum rivet rod.

[0027] refer to Figure 2 and Figure 4The second forming mold 2 includes a second punch 21 and a second die 22. The second punch 21 includes a second punch 211, the working surface of which is circular. The second die 22 includes a second hollow main mold 221, a second front mold core 222, a second rear mold core 223, a second hexagonal socket screw 224, and a second ejector pin 225. The second front mold core 222 and the second rear mold core 223 are frustum-shaped and coaxially disposed within the second hollow main mold 221. The second hollow main mold 221 has tapered mounting holes that match the second front mold core 222 and the second rear mold core 223. The second front mold core 222 is oriented along its axis. A cylindrical second head extrusion die cavity 2221 is provided. A cylindrical second rod extrusion die cavity 2231 is provided along the axial direction on the second rear die core 223. A spherical die cavity 2232 is provided at the front of the second rod extrusion die cavity 2231. A second internal hexagon screw 224 is installed in the rear part of the second hollow main die 221 and is used to limit the second front die core 222 and the second rear die core 223. A second ejector pin 225 is movable back and forth and passes through the second rod extrusion die cavity 2231 and the second head extrusion die cavity 2221. It is used to hold the blank 8. The second ejector pin 225 is connected to a power device such as a spring. The inner diameter of the second head extrusion die cavity 2221 is larger than that of the first head extrusion die cavity 1221, and the inner diameter of the second rod extrusion die cavity 2231 is larger than that of the first rod extrusion die cavity 1231. Thus, when the second punch 211 pushes the billet 8 into the second head extrusion die cavity 2221 and the second rod extrusion die cavity 2231, the head of the billet 8 is subjected to a second extrusion through the second head extrusion die cavity 2221 to achieve upsetting, and the rod of the billet 8 is subjected to a second extrusion through the second rod extrusion die cavity 2231 to achieve upsetting.

[0028] refer to Figure 2 and Figure 5The third forming mold 3 includes a third punch 31 and a third die 32. The third punch 31 includes a third punch 311, the working surface of which is circular. The third die 32 includes a third hollow main mold 321, a third mold core 322, a third hexagonal socket head cap screw 323, and a third ejector pin 324. The third mold core 322 is frustum-shaped and located inside the third hollow main mold 321. The third hollow main mold 321 has a tapered mounting hole that matches the third mold core 322. The upper part 2 has a connected circular groove-shaped third head extrusion die cavity 3221 and a cylindrical third rod extrusion die cavity 3222 along the axial direction from front to back. The third internal hexagon screw 323 is installed in the rear part of the third hollow main mold 321 and is used to limit the third mold core 322. The third ejector pin 324 is movable back and forth and passes through the third rod extrusion die cavity 3222 and the third head extrusion die cavity 3221. It is used to hold the blank 8. The third ejector pin 324 is connected to a power device such as a spring. The inner diameter of the third head extrusion die cavity 3221 is larger than that of the second head extrusion die cavity 2221, and the inner diameter of the third rod extrusion die cavity 3222 is larger than that of the second rod extrusion die cavity 2231. Thus, when the third punch 311 pushes the billet 8 into the third head extrusion die cavity 3221 and the third rod extrusion die cavity 3222, the head of the billet 8 is subjected to a third extrusion through the third head extrusion die cavity 3221 to achieve further upsetting, and the rod of the billet 8 is subjected to a third extrusion through the third rod extrusion die cavity 3222 to achieve further upsetting.

[0029] refer to Figure 2 and Figure 6 The fourth forming mold 4 includes a fourth punch 41 and a fourth die 42. The fourth punch 41 includes a fourth punch 411, the working surface of which is circular. The fourth die 42 includes a fourth hollow main mold 421, a fourth mold core 422, a fourth hexagon socket screw 423, and a fourth ejector pin 424. The fourth mold core 422 is frustum-shaped and located inside the fourth hollow main mold 421. The fourth hollow main mold 421 has a tapered mounting hole that matches the fourth mold core 422. The die 2 has a connected circular groove-shaped fourth head extrusion die cavity 4221 and a cylindrical fourth rod-shaped extrusion die cavity 4222 along the axial direction from front to back. A fourth hexagonal socket screw 423 is installed in the rear part of the fourth hollow main die 421 to limit the fourth die core 422. A fourth ejector pin 424 is movable back and forth and passes through the fourth rod-shaped extrusion die cavity 4222 and the fourth head extrusion die cavity 4221 to hold the blank 8. The fourth ejector pin 424 is connected to a power device such as a spring. The inner diameter of the fourth head extrusion die cavity 4221 is larger than the inner diameter of the third head extrusion die cavity 3221, so that the blank 8 is pushed into the fourth head extrusion die cavity 4221 by the fourth punch 411, and the head of the blank 8 is extruded for the fourth time through the fourth head extrusion die cavity 4221 to achieve the final upsetting.

[0030] refer to Figure 2 , Figure 7 and Figure 8 The blanking die 5 includes a fifth punch 51 and a fifth die 52. The fifth punch 51 includes a fifth punch 511, the working surface of which is a rounded rectangle. The fifth die 52 includes a fifth hollow main die 521, a fifth die core 522, a fifth hexagon socket screw 523, and a fifth ejector pin 524. The fifth die core 522 is frustum-shaped and located inside the fifth hollow main die 521. The fifth hollow main die 521 has a tapered mounting hole that matches the fifth die core 522. The fifth die core 522 has a rounded rectangular blanking inner hole 5221 along the axial direction. The fifth hexagon socket screw 523 is installed in the rear part of the fifth hollow main die 521 and is used to limit the fifth die core 522. The fifth ejector pin 524 can move back and forth and is inserted into the blanking inner hole 5221. It is used to hold the blank 8. The fifth ejector pin 524 is connected to a power device such as a spring. Furthermore, the fifth internal hexagon screw 523 has a through hole 5231 located behind the blanking inner hole 5221. The diameter of the through hole 5231 is larger than the diameter of the blanking inner hole 5221. The fifth internal hexagon screw 523 and the fifth hollow main mold 521 have product dropping holes 6 that are perpendicularly connected to the through hole 5231. The size of the blanking inner hole 5221 is smaller than the size of the blank head 8. When the fifth punch 511 moves toward the blanking inner hole 5221, it presses the blank head against the open end face of the blanking inner hole 5221. The cutting edge of the fifth punch 511 cooperates with the cutting edge of the blanking inner hole 5221, and the cutting edge squeezes the blank 8. The blank 8 breaks along the cutting edge contour, thereby separating the product 7 from the waste. When the cut product 7 enters the through hole 5231 of the fifth internal hexagon screw 523 horizontally, the fifth punch 511 moves back quickly away from the product 7. The fifth punch 511 slowly resets. Due to gravity, the product 7 can fall into the rear of the through hole 5231 and be discharged from the product drop hole 6 to the external preset collection container. The waste falls from the opening of the blanking inner hole 5221 to the preset waste container.

[0031] The working process of this utility model is as follows:

[0032] First, the wire is cut into small blanks 8, approximately 130% of the weight of product 7. These blanks 8 are then clamped by a clamping mechanism and fed into the cavity opening of the first forming mold 1. The clamping mechanism is existing technology and will not be described in detail here; any clamping mechanism capable of clamping and moving can be used in this application. The first punch 111 pushes product 7 into the first head extrusion cavity 1221 and the first rod extrusion cavity 1231, where it cooperates with the first ejector pin 125 to perform preliminary cold heading extrusion forming of the blank 8. After forming, the first ejector pin 125 ejects the blank 8, and the clamping mechanism then clamps the blank 8 and feeds it into the cavity opening of the second forming mold 2. Next, the second punch 211 pushes the blank 8 into the second head extrusion cavity 2221 and the second rod extrusion cavity 2231, where it cooperates with the second ejector pin 225 to perform a second cold heading extrusion forming of the blank 8. After forming, the second ejector pin 225 ejects the blank 8, and the clamping mechanism then clamps the blank. 8 is fed to the cavity opening of the third forming mold 3; then, the third punch 311 pushes the blank 8 into the third head extrusion cavity 3221 and the third rod extrusion cavity 3222, and cooperates with the third ejector pin 324 to perform a third cold heading extrusion forming of the blank 8. After forming, the third ejector pin 324 pushes the blank 8 out, and then the material clamping mechanism clamps the blank 8 and sends it to the cavity opening of the fourth forming mold 4; then, the fourth punch 411 pushes the blank 8 into the fourth head. Inside the extrusion die cavity 4221 and the fourth rod extrusion die cavity 4222, the blank 8 is subjected to a fourth cold heading extrusion forming in cooperation with the fourth ejector pin 424. After forming, the blank 8 is pushed out by the fourth ejector pin 424, and then the blank 8 is clamped by the material clamping mechanism and sent to the opening of the blanking die cavity 5. Finally, the fifth punch 511 moves toward the blanking inner hole 5221. Through the cooperation of the cutting edge of the fifth punch 511 with the cutting edge of the blanking inner hole 5221, the product 7 is separated from the waste.

[0033] It should be understood that all the above embodiments are exemplary and not restrictive. Any modifications, equivalent changes and alterations made by those skilled in the art to the specific embodiments described above under the concept of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A multi-station cold heading die for aluminum rivets, characterized in that: It includes a first forming mold, a second forming mold, a third forming mold, a fourth forming mold, and a blanking mold arranged sequentially from left to right along the blank feeding direction; The first forming die is used to initially extrude the front end of the blank to form a shape close to the head of the aluminum rivet, and to initially extrude the rear end of the blank to reduce the diameter to form the shank of the aluminum rivet. The second forming die is used to perform a second extrusion on the front and rear ends of the billet to achieve upsetting; The third forming die is used to perform a third extrusion on the front and rear ends of the billet to achieve upsetting; The fourth forming die is used to perform a fourth extrusion on the front end of the billet to achieve upsetting; The blanking die is used to cut the front end of the blank to separate products of the required shape and size.

2. The multi-station cold heading die for aluminum rivets according to claim 1, characterized in that: The first forming mold includes a first punch and a first die. The first punch includes a first punch bar with a circular working surface. The first die includes a first hollow main mold, a first front mold core, a first rear mold core, a first hexagon socket screw, and a first ejector pin. The first front mold core and the first rear mold core are frustum-shaped and coaxially disposed within the first hollow main mold. The first front mold core has a cylindrical first head extrusion cavity along the axial direction, and the first rear mold core has a cylindrical first rod extrusion cavity along the axial direction. The first rod extrusion cavity has a chamfered cavity at its front. The first hexagon socket screw is installed in the rear part of the first hollow main mold and is used to limit the first front mold core and the first rear mold core. The first ejector pin is movable back and forth and passes through the first rod extrusion cavity and the first head extrusion cavity to hold the blank.

3. The multi-station cold heading die for aluminum rivets according to claim 1, characterized in that: The second forming mold includes a second punch and a second die. The second punch includes a second punch bar with a circular working surface. The second die includes a second hollow main mold, a second front mold core, a second rear mold core, a second hexagon socket screw, and a second ejector pin. The second front mold core and the second rear mold core are frustum-shaped and coaxially disposed within the second hollow main mold. The second front mold core has a cylindrical second head extrusion cavity along its axial direction, and the second rear mold core has a cylindrical second rod extrusion cavity along its axial direction. The front part of the second rod extrusion cavity has a spherical cavity. The second hexagon socket screw is installed in the rear part of the second hollow main mold and is used to limit the second front mold core and the second rear mold core. The second ejector pin is movable back and forth and passes through the second rod extrusion cavity and the second head extrusion cavity to hold the blank.

4. The multi-station cold heading die for aluminum rivets according to claim 1, characterized in that: The third forming mold includes a third punch and a third die. The third punch includes a third punch bar with a circular working surface. The third die includes a third hollow main mold, a third mold core, a third hexagon socket screw, and a third ejector pin. The third mold core is frustum-shaped and located inside the third hollow main mold. The third mold core has a connected circular groove-shaped third head extrusion cavity and a cylindrical third rod extrusion cavity along the axial direction from front to back. The third hexagon socket screw is installed in the rear part of the third hollow main mold and is used to limit the third mold core. The third ejector pin is movable back and forth and passes through the third rod extrusion cavity and the third head extrusion cavity to hold the blank.

5. The multi-station cold heading die for aluminum rivets according to claim 1, characterized in that: The fourth forming die includes a fourth punch and a fourth die. The fourth punch includes a fourth punch bar with a circular working surface. The fourth die includes a fourth hollow main die, a fourth die core, a fourth hexagon socket screw, and a fourth ejector pin. The fourth die core is frustum-shaped and located inside the fourth hollow main die. The fourth die core has a connected circular groove-shaped fourth head extrusion die cavity and a cylindrical fourth rod extrusion die cavity along the axial direction from front to back. The fourth hexagon socket screw is installed in the rear part of the fourth hollow main die and is used to limit the fourth die core. The fourth ejector pin is movable back and forth and passes through the fourth rod extrusion die cavity and the fourth head extrusion die cavity to hold the blank.

6. The multi-station cold heading die for aluminum rivets according to claim 1, characterized in that: The blanking die includes a fifth punch and a fifth die. The fifth punch includes a fifth punch bar with a rounded rectangular working surface. The fifth die includes a fifth hollow main die, a fifth die core, a fifth hexagon socket screw, and a fifth ejector pin. The fifth die core is frustum-shaped and located inside the fifth hollow main die. The fifth die core has a rounded rectangular blanking hole along its axial direction. The fifth hexagon socket screw is installed at the rear of the fifth hollow main die and is used to limit the fifth die core. The fifth ejector pin is movable back and forth and passes through the blanking hole to hold the blank in place.

7. The multi-station cold heading die for aluminum rivets according to claim 6, characterized in that: The fifth hexagon socket screw has a through hole located behind the blanking inner hole, and the fifth hexagon socket screw and the fifth hollow main mold have product dropping holes that are perpendicularly connected to the through hole.

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