Cold heading die set for vehicle door rivets

Abstract

The utility model discloses a cold heading die set for vehicle door rivets. The cold heading die set comprises a first cold heading die, a second cold heading die, a third cold heading die, a fourth cold heading die, a fifth cold heading die and a sixth cold heading die. The first cold heading die is used for heading the blank into a first pre-heading piece; and the second cold heading die upsets the first pre-heading piece into a second pre-heading piece. And the second pre-upsetting part is upset into a third pre-upsetting part by the third cold upsetting die. And the third pre-upset part is upset into a fourth pre-upset part by the fourth cold upsetting die. And the fourth pre-upset part is upset into a fifth pre-upset part by the fifth cold upsetting die. And the fifth pre-upset part is upset into a finished product by a sixth cold upsetting die. According to the utility model, step-by-step cold heading forming is realized, metal materials are controlled to gradually flow and deform, cracks or fractures of finished rivets are avoided, irregularity of the heads of the rivets is avoided, and the product quality is improved.

Description

Technical Field

[0001] The utility model belongs to a cold heading die set, and particularly relates to a cold heading die set for door rivets. Background Art

[0002] When mass-producing door rivets, in order to achieve less cutting or even non-cutting production, a cold heading production process is usually adopted. During the cold heading process, the internal hexagon locking hole occupies a large volume and is relatively deep, making it prone to cracks. Moreover, during the cold heading process of the rivet head, the metal flow is uneven, resulting in an irregular shape of the rivet head and causing quality problems.

[0003] Therefore, the above situation needs to be solved urgently. Content of the Utility Model

[0004] Purpose of the utility model: In order to overcome the above deficiencies, the utility model provides a cold heading die set, particularly a cold heading die set for door rivets. Six groups of door rivets are cold headed in sequence to control the gradual flow and deformation of the metal material, avoid cracks or fractures in the finished rivets, avoid irregular shapes of the rivet heads, and improve product quality.

[0005] Technical solution: To achieve the above object, a cold heading die set for door rivets includes a first cold heading die, a second cold heading die, a third cold heading die, a fourth cold heading die, a fifth cold heading die, and a sixth cold heading die. The first cold heading die, the second cold heading die, the third cold heading die, the fourth cold heading die, the fifth cold heading die, and the sixth cold heading die perform cold heading processing in sequence. The first cold heading die reduces the diameter of one end of the blank and upsets it to form a first pre-upset part, the first cold heading die upsets the blank into a first pre-upset part, and the first cold heading die upsets a first pre-upset hole in the first pre-upset part. The second cold heading die upsets the first pre-upset part into a second pre-upset part, the second cold heading die upsets a second pre-upset hole at one end of the first pre-upset part away from the first pre-upset hole, and the second cold heading die enlarges the first pre-upset hole to form a third pre-upset hole. The third cold heading die upsets the second pre-upset part into a third pre-upset part, the third cold heading die upsets the second pre-upset hole into a fourth pre-upset hole, and the third cold heading die extrudes and reduces the diameter of the outer wall of the second pre-upset part to form a second pre-upset part. The fourth cold heading die upsets the third pre-upset part into a fourth pre-upset part, the fourth pre-upset hole is upset into a fifth pre-upset hole, the fourth cold heading die straightens the second pre-upset part, and the fourth cold heading die shortens the third pre-upset part. The fifth cold heading die upsets the fourth pre-upset part into a fifth pre-upset part, the fifth cold heading die upsets one end of the fourth pre-upset part away from the fifth pre-upset hole into a sixth pre-upset hole, and the fifth pre-upset hole collapses. The sixth cold heading die upsets the fifth pre-upset part into a finished product, the sixth cold heading die punches the sixth pre-upset hole into an internal hexagon lock hole, and the sixth cold heading die upsets one end of the fifth pre-upset part away from the sixth pre-upset hole to form a head. The utility model forms by step-by-step cold heading, controls the gradual flow and deformation of the metal material, avoids cracks or fractures in the finished rivets, first cold heads a fifth pre-upset hole at the rivet head, and then makes the fifth pre-upset hole collapse, and the hole wall of the fifth pre-upset hole extends outwards, avoiding irregularity of the rivet head and improving product quality.

[0006] Further, in the above cold heading die set for door rivets, the first cold heading die includes a first main die and a first punch die. A first die core is provided on one side of the first main die close to the first punch die, a first die cavity is provided in the center of the first die core, a first ejector rod penetrates through the first main die, the first ejector rod is slidably connected to the first main die, and the first ejector rod extends into the first die cavity. A first punch penetrates through the first punch die, and the first punch is slidably connected to the first punch die. The first punch and the first ejector rod jointly perform cold heading on the blank in the first die cavity.

[0007] Further, in the above cold heading die set for door rivets, the second cold heading die includes a second main die and a second punch die. A second die core is provided on one side of the second main die close to the second punch die, a second die cavity is provided in the center of the second die core, a second ejector rod penetrates through the second main die, the second ejector rod is slidably connected to the second main die, and the second ejector rod extends into the second die cavity. A second punch penetrates through the second main die, and the second punch is slidably connected to the second punch die. The second punch and the second ejector rod jointly perform cold heading on the first pre-upset part in the second die cavity.

[0008] Further, in the above cold heading die set for door rivets, the third cold heading die includes a third main die and a third punching die. A third die core is provided on one side of the third main die close to the third punching die. A third die cavity is provided at the center of the third die core. A third ejector rod passes through the third main die. The third ejector rod is slidably connected to the third main die, and the third ejector rod extends into the third die cavity. A third punch passes through the third punching die. The third punch is slidably connected to the third punching die. The third punch and the third ejector rod jointly perform cold heading on the second pre-heading part in the third die cavity.

[0009] Further, in the above cold heading die set for door rivets, the fourth cold heading die includes a fourth main die and a fourth punching die. A fourth die core is provided on one side of the fourth main die close to the fourth punching die. A fourth die cavity is provided at the center of the fourth die core. A fourth ejector rod passes through the fourth main die. The fourth ejector rod is slidably connected to the fourth main die, and the fourth ejector rod extends into the fourth die cavity. A fourth punch passes through the fourth punching die. The fourth punch is slidably connected to the fourth punching die. The fourth punch and the fourth ejector rod jointly perform cold heading on the third pre-heading part in the fourth die cavity.

[0010] Further, in the above cold heading die set for door rivets, the fifth cold heading die includes a fifth main die and a fifth punching die. A fifth die core is provided on one side of the fifth main die close to the fifth punching die. A fifth die cavity is provided at the center of the fifth die core. A fifth ejector rod passes through the fifth main die. The fifth ejector rod is slidably connected to the fifth main die, and the fifth ejector rod extends into the fifth die cavity. A fifth punch passes through the fifth punching die. The fifth punch is slidably connected to the fifth punching die. The fifth punch and the fifth ejector rod jointly perform cold heading on the fourth pre-heading part in the fifth die cavity.

[0011] Further, in the above cold heading die set for door rivets, the sixth cold heading die includes a sixth main die and a sixth punching die. A sixth die core is provided on one side of the sixth main die close to the sixth punching die. A sixth die cavity is provided at the center of the sixth die core. A sixth ejector rod passes through the sixth main die. The sixth ejector rod is slidably connected to the sixth main die, and the sixth ejector rod extends into the sixth die cavity. A sixth punch passes through the sixth punching die. The sixth punch is slidably connected to the sixth punching die. The sixth punch and the sixth ejector rod jointly perform cold heading on the fifth pre-heading part in the sixth die cavity. An ejection mechanism is provided on one side of the sixth main die close to the sixth punching die. The ejection mechanism is provided outside the sixth ejector rod, and the ejection mechanism ejects the finished product out of the sixth die cavity.

[0012] Further, in the above cold heading die set for door rivets, the ejection mechanism includes a spacer block. A positioning block is provided on the upper side of the spacer block. The sixth ejector rod passes through the center of the positioning block. The lower end of the sixth ejector rod abuts against the spacer block. A thimble passes through the spacer block. The upper end of the thimble passes through the positioning block, and the lower end of the thimble passes through the spacer block and abuts against the stripper rod. An ejection sleeve is provided on the upper side of the positioning block. The ejection sleeve is slidably connected to the outside of the sixth ejector rod, and the ejection sleeve extends into the sixth die cavity to eject the finished product.

[0013] Further, in the above cold heading die set for door rivets, a washer is provided at the upper end of the positioning block. The washer is provided between the positioning block and the ejection sleeve.

[0014] As can be seen from the above technical solution, the utility model has the following beneficial effects: For the cold heading die set of the door rivet of the utility model, the rivet is cold headed step by step to control the gradual flow and deformation of the metal material, avoiding cracks or fractures in the finished rivet. First, a fifth pre-heading hole is cold headed at the head of the rivet, and then the fifth pre-heading hole is collapsed, and the hole wall of the fifth pre-heading hole extends outwards, avoiding irregularity of the rivet head and improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a process diagram of a cold heading die set of a door rivet of the utility model;

[0016] Figure 2 It is a cross-sectional view of a cold heading die set of a door rivet of the utility model;

[0017] Figure 3 It is a cross-sectional view of the first cold heading die of the utility model;

[0018] Figure 4 It is a cross-sectional view of the second cold heading die of the utility model;

[0019] Figure 5 It is a cross-sectional view of the third cold heading die of the utility model;

[0020] Figure 6 It is a cross-sectional view of the fourth cold heading die of the utility model;

[0021] Figure 7 It is a cross-sectional view of the fifth cold heading die of the utility model;

[0022] Figure 8 It is a cross-sectional view of the sixth cold heading die of the utility model;

[0023] Figure 9 is Figure 8 a partial enlarged view of.

[0024] In the figure: 1. First cold heading die, 11. First main die, 110. Blank, 111. First pre-heading part, 1111. First pre-heading portion, 1112. First pre-heading hole, 112. Second pre-heading part, 1121. Second pre-heading hole, 1122. Third pre-heading hole, 113. Third pre-heading part, 1131. Fourth pre-heading hole, 1132. Second pre-heading portion, 114. Fourth pre-heading part, 1141. Fifth pre-heading hole, 115. Fifth pre-heading part, 1151. Sixth pre-heading hole, 116. Finished product, 1161. Hexagon socket head cap screw hole, 1162. Head, 12. First punch die, 121. First punch, 17. First die core, 171. First die cavity, 172. First ejector rod, 2. Second cold heading die, 21. Second main die, 22. Second punch die, 221. Second punch, 23. Second die core, 231. Second die cavity, 232. Second ejector rod, 3. Third cold heading die, 31. Third main die, 32. Third punch die, 321. Third punch, 33. Third die core, 331. Third die cavity, 332. Third ejector rod, 4. Fourth cold heading die, 41. Fourth main die, 42. Fourth punch die, 421. Fourth punch, 43. Fourth die core, 431. Fourth die cavity, 432. Fourth ejector rod, 5. Fifth cold heading die, 51. Fifth main die, 52. Fifth punch die, 521. Fifth punch, 53. Fifth die core, 531. Fifth die cavity, 532. Fifth ejector rod, 6. Sixth cold heading die, 61. Sixth main die, 62. Sixth punch die, 621. Sixth punch, 63. Sixth die core, 631. Sixth die cavity, 632. Sixth ejector rod, 64. Ejecting mechanism, 641. Spacer block, 642. Positioning block, 643. Ejector pin, 644. Stripping rod, 645. Ejecting sleeve, 646. Washer. Detailed implementation mode

[0025] Example 1

[0026] Such as Figure 1-2A cold heading die set for a car door rivet, including a first cold heading die 1, a second cold heading die 2, a third cold heading die 3, a fourth cold heading die 4, a fifth cold heading die 5, and a sixth cold heading die 6. The first cold heading die 1, the second cold heading die 2, the third cold heading die 3, the fourth cold heading die 4, the fifth cold heading die 5, and the sixth cold heading die 6 perform cold heading processing in sequence. The first cold heading die 1 reduces the diameter of one end of the blank 110 to upset the first pre-upset part 1111, the first cold heading die 1 upsets the blank 110 into the first pre-upset part 111, and the first cold heading die 1 upsets the first pre-upset hole 1112 in the first pre-upset part 1111. The second cold heading die 2 upsets the first pre-upset part 111 into the second pre-upset part 112, the second cold heading die 2 upsets the end of the first pre-upset part 111 away from the first pre-upset hole 1112 to form the second pre-upset hole 1121, and the second cold heading die 2 upsets the first pre-upset hole 1112 to enlarge it into the third pre-upset hole 1122. The third cold heading die 3 upsets the second pre-upset part 112 into the third pre-upset part 113, the third cold heading die 3 upsets the second pre-upset hole 1121 into the fourth pre-upset hole 1131, and the third cold heading die 3 extrudes and reduces the diameter of the outer wall of the second pre-upset part 112 to form the second pre-upset part 1132. The fourth cold heading die 4 upsets the third pre-upset part 113 into the fourth pre-upset part 114, the fourth pre-upset hole 1131 is upset into the fifth pre-upset hole 1141, the fourth cold heading die 4 straightens the second pre-upset part 1132, and the fourth cold heading die 4 shortens the third pre-upset part 113. The fifth cold heading die 5 upsets the fourth pre-upset part 114 into the fifth pre-upset part 115, the fifth cold heading die 5 upsets the end of the fourth pre-upset part 114 away from the fifth pre-upset hole 1141 into the sixth pre-upset hole 1151, and the fifth pre-upset hole 1141 collapses. The sixth cold heading die 6 upsets the fifth pre-upset part 115 into the finished product 116, the sixth cold heading die 6 upsets the sixth pre-upset hole 1151 into the internal hexagon locking hole 1161, and the sixth cold heading die 6 upsets the end of the fifth pre-upset part 115 away from the sixth pre-upset hole 1151 to form the head 1162.

[0027] As Figure 3 For the cold heading die set of the car door rivet shown, the first cold heading die 1 includes a first main die 11 and a first punch die 12. A first die core 17 is provided on one side of the first main die 11 close to the first punch die 12. A first die cavity 171 is provided at the center of the first die core 17. A first ejector rod 172 passes through the first main die 11. The first ejector rod 172 is slidably connected to the first main die 11, and the first ejector rod 172 extends into the first die cavity 171. A first punch head 121 passes through the first punch die 12. The first punch head 121 is slidably connected to the first punch die 12. The first punch head 121 and the first ejector rod 172 jointly perform cold heading on the blank 110 in the first die cavity 171.

[0028] As Figure 4The shown cold heading die set for door rivets. The second cold heading die 2 includes a second main die 21 and a second punching die 22. On the side of the second main die 21 close to the second punching die 22, there is a second die core 23. In the center of the second die core 23, there is a second die cavity 231. A second ejector rod 232 passes through the second main die 21. The second ejector rod 232 is slidably connected to the second main die 21, and the second ejector rod 232 extends into the second die cavity 231. A second punch 221 passes through the second main die 21. The second punch 221 is slidably connected to the second punching die 22. The second punch 221 and the second ejector rod 232 jointly perform cold heading on the first pre-heading part 111 in the second die cavity 231.

[0029] As Figure 5 The shown cold heading die set for door rivets. The third cold heading die 3 includes a third main die 31 and a third punching die 32. On the side of the third main die 31 close to the third punching die 32, there is a third die core 33. In the center of the third die core 33, there is a third die cavity 331. A third ejector rod 332 passes through the third main die 31. The third ejector rod 332 is slidably connected to the third main die 31, and the third ejector rod 332 extends into the third die cavity 331. A third punch 321 passes through the third punching die 32. The third punch 321 is slidably connected to the third punching die 32. The third punch 321 and the third ejector rod 332 jointly perform cold heading on the second pre-heading part 112 in the third die cavity 331.

[0030] As Figure 6 The shown cold heading die set for door rivets. The fourth cold heading die 4 includes a fourth main die 41 and a fourth punching die 42. On the side of the fourth main die 41 close to the fourth punching die 42, there is a fourth die core 43. In the center of the fourth die core 43, there is a fourth die cavity 431. A fourth ejector rod 432 passes through the fourth main die 41. The fourth ejector rod 432 is slidably connected to the fourth main die 41, and the fourth ejector rod 432 extends into the fourth die cavity 431. A fourth punch 421 passes through the fourth punching die 42. The fourth punch 421 is slidably connected to the fourth punching die 42. The fourth punch 421 and the fourth ejector rod 432 jointly perform cold heading on the third pre-heading part 113 in the fourth die cavity 431.

[0031] As Figure 7 The shown cold heading die set for door rivets. The fifth cold heading die 5 includes a fifth main die 51 and a fifth punching die 52. On the side of the fifth main die 51 close to the fifth punching die 52, there is a fifth die core 53. In the center of the fifth die core 53, there is a fifth die cavity 531. A fifth ejector rod 532 passes through the fifth main die 51. The fifth ejector rod 532 is slidably connected to the fifth main die 51, and the fifth ejector rod 532 extends into the fifth die cavity 531. A fifth punch 521 passes through the fifth punching die 52. The fifth punch 521 is slidably connected to the fifth punching die 52. The fifth punch 521 and the fifth ejector rod 532 jointly perform cold heading on the fourth pre-heading part 114 in the fifth die cavity 531.

[0032] As Figure 8The cold heading die set of the door rivet shown includes a sixth cold heading die 6, and the sixth cold heading die 6 includes a sixth main die 61 and a sixth punching die 62. On one side of the sixth main die 61 close to the sixth punching die 62, there is a sixth die core 63. A sixth die cavity 631 is provided in the center of the sixth die core 63. A sixth ejector rod 632 penetrates through the sixth main die 61. The sixth ejector rod 632 is slidably connected to the sixth main die 61, and the sixth ejector rod 632 extends into the sixth die cavity 631. A sixth punch 621 penetrates through the sixth punching die 62. The sixth punch 621 is slidably connected to the sixth punching die 62. The sixth punch 621 and the sixth ejector rod 632 jointly perform cold heading on the fifth pre-heading part 115 in the sixth die cavity 631. On one side of the sixth main die 61 close to the sixth punching die 62, there is an ejection mechanism 64. The ejection mechanism 64 is arranged outside the sixth ejector rod 632, and the ejection mechanism 64 ejects the finished product 116 out of the sixth die cavity 631.

[0033] As Figure 9 For the cold heading die set of the door rivet shown, the ejection mechanism 64 includes a cushion block 641. On the upper side of the cushion block 641, there is a positioning block 642. The sixth ejector rod 632 penetrates through the center of the positioning block 642. The lower end of the sixth ejector rod 632 abuts against the cushion block 641. A ejector pin 643 penetrates through the cushion block 641. The upper end of the ejector pin 643 passes through the positioning block 642, and the lower end of the ejector pin 643 passes through the cushion block 641 and abuts against the stripping rod 644. On the upper side of the positioning block 642, there is an ejection sleeve 645. The ejection sleeve 645 is slidably connected to the outside of the sixth ejector rod 632. The ejection sleeve 645 extends into the sixth die cavity 631 to eject the finished product 116. On the upper end of the positioning block 642, there is a washer 646. The washer 646 is arranged between the positioning block 642 and the ejection sleeve 645.

[0034] The above embodiments are exemplary. Their purpose is to illustrate the technical concept and characteristics of the present invention so that those skilled in this field can understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention in turn. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A door rivet cold heading die set, characterized in that: The invention comprises a first cold heading die (1), a second cold heading die (2), a third cold heading die (3), a fourth cold heading die (4), a fifth cold heading die (5), and a sixth cold heading die (6); the first cold heading die (1), the second cold heading die (2), the third cold heading die (3), the fourth cold heading die (4), the fifth cold heading die (5), and the sixth cold heading die (6) perform cold heading processing in sequence, the first cold heading die (1) shrinks one end of a blank (110) and forges a first pre-forging portion (1111); the first cold heading die (1) forges the blank (110) into a first pre-forging piece (111); The first cold heading die (1) forges a first pre-forging hole (1112) in the first pre-forging portion (1111); the second cold heading die (2) forges the first pre-forging piece (111) into a second pre-forging piece (112); the second cold heading die (2) forges a second pre-forging hole (1121) at an end of the first pre-forging piece (111) away from the first pre-forging hole (1112); the second cold heading die (2) forges the first pre-forging hole (1112) into a third pre-forging hole (1122); the third cold heading die (3) forges the second pre-forging piece (112) into a third pre-forging piece (113 ...1) into a second pre-forging piece (112). The die (3) upsets the second pre-upsetting hole (1121) into a fourth pre-upsetting hole (1131); the third cold upsetting die (3) extrude and compress the outer wall of the second pre-upsetting piece (112) to form a second pre-upsetting portion (1132); the fourth cold upsetting die (4) upsets the third pre-upsetting piece (113) into a fourth pre-upping piece (114); the fourth pre-upping hole (1131) upsets into a fifth pre-upping hole (1141); the fourth cold upsetting die (4) upsets the second pre-upping portion (1132) straight; the fourth cold upsetting die (4) upsets the third pre-upping piece (113) short; the fifth cold upsetting die (5) upsets the fourth pre-upping piece (1141); The fifth pre-forging die (114) is forged into a fifth pre-forging piece (115), the fifth cold forging die (5) forges the fourth pre-forging piece (114) away from the fifth pre-forging hole (1141) into a sixth pre-forging hole (1151), and the fifth pre-forging hole (1141) is collapsed; the sixth cold forging die (6) forges the fifth pre-forging piece (115) into a finished product (116), the sixth cold forging die (6) forges the sixth pre-forging hole (1151) into a hexagonal locking hole (1161), and the sixth cold forging die (6) forges a head (1162) at one end of the fifth pre-forging piece (115) away from the sixth pre-forging hole (1151).

2. The vehicle door rivet cold heading die set according to claim 1, characterized in that: The first cold heading die (1) comprises a first main die (11) and a first punch die (12); a first die core (17) is provided on a side of the first main die (11) close to the first punch die (12); a first die cavity (171) is provided at the center of the first die core (17); a first ejector rod (172) is passed through the first main die (11); the first ejector rod (172) and the first main die (11) are slidably connected; the first ejector rod (172) extends into the first die cavity (171); a first punch (121) is passed through the first punch die (12); the first punch (121) and the first punch die (12) are slidably connected; the first punch (121) and the first ejector rod (172) jointly perform cold heading on the blank (110) in the first die cavity (171).

3. The vehicle door rivet cold heading die set according to claim 1, characterized in that: The second cold heading die (2) comprises a second main die (21) and a second punch die (22); a second die core (23) is provided on a side of the second main die (21) close to the second punch die (22); a second die cavity (231) is provided at the center of the second die core (23); a second ejector rod (232) is passed through the second main die (21); the second ejector rod (232) is slidably connected to the second main die (21); the second ejector rod (232) extends into the second die cavity (231); a second punch (221) is passed through the second main die (21); the second punch (221) is slidably connected to the second punch die (22); the second punch (221) and the second ejector rod (232) jointly perform cold heading on the first pre-forging piece (111) in the second die cavity (231).

4. The door rivet cold heading die set according to claim 1, characterized in that: The third cold heading die (3) comprises a third main die (31) and a third punch die (32); a third die core (33) is provided on a side of the third main die (31) close to the third punch die (32); a third die cavity (331) is provided at the center of the third die core (33); a third ejector rod (332) is passed through the third main die (31); the third ejector rod (332) and the third main die (31) are slidably connected; the third ejector rod (332) extends into the third die cavity (331); a third punch (321) is passed through the third punch die (322); the third punch (321) and the third punch die (322) are slidably connected; the third punch (321) and the third ejector rod (332) jointly perform cold heading on a second pre-forging piece (112) in the third die cavity (331).

5. The vehicle door rivet cold heading die set according to claim 1, characterized in that: The fourth cold heading die (4) comprises a fourth main die (41) and a fourth punch die (42); a fourth die core (43) is provided on a side of the fourth main die (41) close to the fourth punch die (42); a fourth die cavity (431) is provided at the center of the fourth die core (43); a fourth ejector rod (432) is passed through the fourth main die (41); the fourth ejector rod (432) and the fourth main die (41) are slidably connected; the fourth ejector rod (432) extends into the fourth die cavity (431); a fourth punch (421) is passed through the fourth punch die (42); the fourth punch (421) and the fourth punch die (42) are slidably connected; the fourth punch (421) and the fourth ejector rod (432) jointly perform cold heading on a third pre-forging piece (113) in the fourth die cavity (431).

6. The vehicle door rivet cold heading die set according to claim 1, characterized in that: The fifth cold heading die (5) comprises a fifth main die (51) and a fifth punch die (52); a fifth die core (53) is provided on a side of the fifth main die (51) close to the fifth punch die (52); a fifth die cavity (531) is provided at the center of the fifth die core (53); a fifth ejector pin (532) is passed through the fifth main die (51); the fifth ejector pin (532) and the fifth main die (51) are slidably connected; the fifth ejector pin (532) extends into the fifth die cavity (531); a fifth punch (521) is passed through the fifth punch die (522); the fifth punch (521) and the fifth punch die (522) are slidably connected; the fifth punch (521) and the fifth ejector pin (532) jointly perform cold heading on a fourth pre-forging piece (114) in the fifth die cavity (531).

7. The vehicle door rivet cold heading die set according to claim 1, characterized in that: The sixth cold heading die (6) comprises a sixth main die (61) and a sixth punch die (62); a sixth die core (63) is provided on a side of the sixth main die (61) close to the sixth punch die (62); a sixth die cavity (631) is provided at the center of the sixth die core (63); a sixth ejector rod (632) is passed through the sixth main die (61); the sixth ejector rod (632) and the sixth main die (61) are slidably connected; the sixth ejector rod (632) extends into the sixth die cavity (631); the sixth punch die (62) is passed through A sixth punch (621), the sixth punch (621) and the sixth die (62) are slidably connected, the sixth punch (621) and the sixth ejector rod (632) jointly perform cold heading on the fifth pre-headed piece (115) in the sixth die cavity (631); an ejector mechanism (64) is provided on the side of the sixth main die (61) close to the sixth die (62), the ejector mechanism (64) is provided on the outside of the sixth ejector rod (632), and the ejector mechanism (64) ejects the finished product (116) out of the sixth die cavity (631).

8. The vehicle door rivet cold heading die set according to claim 7, characterized in that: The ejection mechanism (64) comprises a cushion block (641), a positioning block (642) is provided on the upper side of the cushion block (641), a sixth ejector rod (632) is passed through the center of the positioning block (642), the lower end of the sixth ejector rod (632) abuts against the cushion block (641), an ejector pin (643) is passed through the cushion block (641), the upper end of the ejector pin (643) passes through the positioning block (642), the lower end of the ejector pin (643) passes through the cushion block (641) and abuts against the stripping rod (644); an ejection sleeve (645) is provided on the upper side of the positioning block (642), the ejection sleeve (645) is slidably connected to the outer side of the sixth ejector rod (632), and the ejection sleeve (645) extends into the sixth mold cavity (631) to eject the finished product (116).

9. The vehicle door rivet cold heading die set according to claim 8, characterized in that: A gasket (646) is provided at the upper end of the positioning block (642), and the gasket (646) is arranged between the positioning block (642) and the ejection sleeve (645).

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