Cold heading device for automobile chassis suspension bolt

Abstract

The utility model relates to an automobile chassis suspension bolt cold heading device which comprises a cutting mechanism, an ejection mechanism, a conveying mechanism and six dies, the cutting mechanism cuts off a blank, and the ejection mechanism ejects the blank; the conveying mechanism moves between the ejection mechanism and the six molds for feeding; the six dies comprise a first upsetting die used for forming a chamfer at the lower end of an initial blank, a second upsetting die used for conducting first-time rod shrinkage on the lower end of a first blank, and a third upsetting die used for conducting second-time rod shrinkage on the lower end of a second blank. The fourth upsetting die is used for carrying out third-time rod shrinkage and head preliminary punch forming on the lower end of the third blank; the fifth upsetting die is used for carrying out further punch forming on the head of the fourth blank; and the final upsetting die is used for carrying out final shaping on the head of the fifth blank and carrying out fourth-time rod shrinkage on the lower end of the fifth blank. By the adoption of the technical scheme, the mold manufacturing structure is simple in technological process and convenient to maintain; the die is long in service life and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery, and in particular relates to a cold heading device for automobile chassis suspension bolts. Background Art

[0002] The automobile chassis adjustment nut plays an important role in the automobile suspension system, providing guarantee for the stability, safety and comfort of the automobile. It mainly plays the role of connection and positioning. The finished product of this part has two threads of different specifications and three smooth steps of different sizes. Therefore, there are a total of five steps and multiple segments when the threads are not processed. In the past, in order to make this part, a section of straight material was mostly machined separately, but this processing method has a large material loss on the parts, high cost, and is not conducive to sustainable development. Utility Model Content

[0003] In summary, in order to overcome the deficiencies of the prior art, the utility model provides a novel cold heading forming device for welding hexagonal flange nuts which saves cost and improves quality.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cold forging device for automobile chassis suspension bolts, comprising a cutting mechanism, an ejection mechanism, a conveying mechanism and six dies, wherein the cutting mechanism cuts the blank, and the ejection mechanism lifts the blank; the conveying mechanism moves and feeds between the ejection mechanism and the six dies; the six dies comprise: a first forging die for chamfering the lower end of the initial blank, a second forging die for the first shrinkage of the lower end of the first blank, a third forging die for the second shrinkage of the lower end of the second blank, a fourth forging die for the third shrinkage of the lower end of the third blank and preliminary stamping of the head, and a fourth forging die for the head of the fourth blank. The six dies include a lower die and an upper die, the lower die including a lower die shell, a lower die core, a lower die punch, a lower die locking nut and a lower die pad, the lower die core is arranged in the lower die shell, a lower model cavity is arranged in the lower die core, the lower die pad is arranged below the lower die core, the lower die locking nut fixes the lower die pad and the lower die core by being connected to the lower die shell, and one end of the lower die punch passes through the lower die pad and extends into the lower model cavity; the upper die includes an upper die shell, an upper die pad and an upper die punch, and the upper die pad is arranged in the upper die shell.

[0005] By adopting the above technical scheme, the number of machining times can be reduced, the loss of materials can be reduced, and the cost can be reduced, which is conducive to saving resources and sustainable development. During the cold heading process, the metal material undergoes plastic deformation in a cold state, its internal structure is refined, and the grains become finer. This microstructure makes the cold heading parts have high mechanical strength, hardness and corrosion resistance. The material blank is deformed in the mold, and the friction between the material blank and the inner wall of the mold will not cause product damage at the corners. The production efficiency is high, and batch production can be achieved by using the mold on the cold heading machine. The operation is simple, and workers only need to perform simple equipment operation and monitoring. Compared with some complex hot processing equipment and high-precision CNC machine tools, the equipment required for this design is relatively simple and the investment is relatively small. The mold manufacturing structure process is simple and easy to maintain. The mold has a long life and low cost.

[0006] The utility model is further configured as follows: the lower die core of the first upsetting die comprises a first section No. 1 die core for shaping the main rod of the initial blank and a second section No. 1 die core for chamfering the lower end of the initial blank; the lower die core of the second upsetting die comprises a first section No. 2 die core for shaping the main rod of the first blank, a second section No. 2 die core for transitionally forming the first section of the contracted rod at the lower end of the first blank, and a third section No. 2 die core for extending the first section of the contracted rod of the first blank; the lower die core of the third upsetting die comprises a first section No. 3 die core for shaping the main rod of the second blank, a second section No. 4 die core for forming the lower end of the main rod of the second blank, and a third section No. 5 die core for extending the first section of the contracted rod of the first blank; the lower die core of the third upsetting die comprises a first section No. 3 die core for shaping the main rod of the second blank, a second section No. 5 die core for forming the lower end of the main rod of the second blank The lower die core of the four-heading mold includes a first section No. 4 mold core for shaping the main rod of the third blank, a second section No. 4 mold core for simultaneously shaping the first section and the second section of the main rod of the third blank, a third section No. 4 mold core for transitionally shaping the lower end of the second section of the second blank into a third section of the shrink rod, and a fourth section No. 3 mold core for transitionally shaping the lower end of the second section of the shrink rod of the second blank into a third section of the shrink rod; the lower die core of the four-heading mold includes a first section No. 4 mold core for shaping the main rod of the third blank, a second section No. 4 mold core for simultaneously shaping the first section and the second section of the shrink rod of the third blank, a third section No. 4 mold core for transitionally shaping the lower end of the second section of the shrink rod of the third blank into a third section of the shrink rod, and a fourth section No. 4 mold core for transitionally shaping the lower end of the second section of the shrink rod of the third blank into a third section of the shrink rod The fourth section No. 4 mold core for extending the shrink rod, the upper mold shell of the four-upsetting mold includes a primary molding cavity for molding the head of the main rod of the third blank; the lower mold core of the five-upsetting mold includes a first section No. 5 mold core for shaping the main rod of the fourth blank, a second section No. 5 mold core for simultaneously molding the first section shrink rod and the second section shrink rod at the lower end of the main rod of the fourth blank, a third section No. 5 mold core for transitionally molding the lower end of the second section shrink rod of the fourth blank into the third section shrink rod, and a fourth section No. 5 mold core for transitionally molding the lower end of the third section shrink rod of the fourth blank into the fourth section shrink rod, the upper mold shell of the five-upsetting mold includes a mold core for A second molding cavity for further molding the head of the main rod of the fourth blank; the lower mold core of the final upsetting mold includes a first-section No. 6 mold core for shaping the main rod of the fifth blank, a second-section No. 6 mold core for simultaneously molding the first-section shrinkage rod and the second-section shrinkage rod at the lower end of the main rod of the fifth blank, a third-section No. 6 mold core for simultaneously molding the third-section shrinkage rod and the fourth-section shrinkage rod at the lower end of the second-section shrinkage rod of the fifth blank, and a fourth-section No. 6 mold core for extending the fourth-section shrinkage rod of the fifth blank; the upper mold shell of the final upsetting mold includes a final molding cavity for molding the head of the main rod of the fourth blank into an external hexagonal umbrella head.

[0007] By adopting the above technical solutions, 1. Improve the flexibility and adaptability of the mold: the lower mold cavity is composed of a multi-section mold core. This design enables the lower mold cavity to be flexibly adjusted according to bolts of different specifications and shapes, which improves the versatility and adaptability of the mold. This design enables a set of molds to process multiple types of bolts, reducing production costs and the frequency of mold replacement; 2. Optimize material flow and molding quality: It helps to guide the flow of materials during the cold heading process, so that the material can fill the mold cavity more evenly, reducing defects and internal stress; 3. Enhance the strength and stability of the mold: By designing the lower mold cavity in this way, the stress and impact on the mold during operation can be dispersed to a certain extent, reducing the risk of wear and damage to the mold. This design also helps to improve the overall rigidity and stability of the mold and ensure the processing accuracy and consistency of the bolts; 4. Facilitate the maintenance and care of the mold: This design makes the mold more convenient to maintain and care.

[0008] The utility model is further configured as follows: the second section No. 1 mold core includes a first rod shrinkage cavity, the chamfer of the first rod shrinkage cavity is a1, 70°≤a1<90°; the second section No. 2 mold core includes a second rod shrinkage cavity, the chamfer of the second rod shrinkage cavity is a2, a2=60°; the second section No. 3 mold core includes a third rod shrinkage cavity, the chamfer of the third rod shrinkage cavity is a3, a3=a2=60°, the third section No. 3 mold core includes a fourth rod shrinkage cavity, the chamfer of the fourth rod shrinkage cavity is a4, a4=a3=60°, the fourth section No. 3 mold core includes a fifth rod shrinkage cavity, the chamfer of the fifth rod shrinkage cavity is a5, 30°≤a5<a4; the second section No. 4 mold core includes a sixth rod shrinkage cavity, the sixth rod shrinkage cavity includes an upper rod shrinkage segment, a middle rod shrinkage segment and a lower rod shrinkage segment, the chamfer between the upper rod shrinkage segment and the middle rod shrinkage segment is a6, the chamfer between the middle rod shrinkage segment and the lower rod shrinkage segment is a7, a6=a7=60 °, the third section No. 4 mold core includes a seventh shrink rod cavity, the chamfer of the seventh shrink rod cavity is a8, 30°≤a8=a5; the second section No. 5 mold core includes an eighth shrink rod cavity, the eighth shrink rod cavity includes an upper shrink rod segment, a middle shrink rod segment and a lower shrink rod segment, the chamfer between the upper shrink rod segment and the middle shrink rod segment is a9, the chamfer between the middle shrink rod segment and the lower shrink rod segment is a10, a9=a10=60°, the third section No. 5 mold core includes a ninth shrink rod cavity The chamfer of the ninth shrink rod cavity is a11, a11=60°; the fourth section No. 5 mold core includes the tenth shrink rod cavity, the chamfer of the tenth shrink rod cavity is a12, 30°≤a12=a8; the second section No. 6 mold core includes the eleventh shrink rod cavity, the eleventh shrink rod cavity includes an upper shrink rod segment, a middle shrink rod segment and a lower shrink rod segment, the chamfer between the upper shrink rod segment and the middle shrink rod segment is a13, the chamfer between the middle shrink rod segment and the lower shrink rod segment is a14, a13=a14=60°; the third section No. 6 mold core includes the twelfth shrink rod cavity, the twelfth shrink rod cavity includes an upper shrink rod segment, a middle shrink rod segment and a lower shrink rod segment, the chamfer between the upper shrink rod segment and the middle shrink rod segment is a15, the chamfer between the middle shrink rod segment and the lower shrink rod segment is a16, a15=60°, a16=30°.

[0009] By adopting the above technical solution, the design of this angle helps to increase the stability of bolt forming, and can more effectively disperse the stress at the connection to avoid damage caused by stress concentration; at the same time, it helps to guide the flow of material during the cold heading process, so that the material can fill the mold cavity more evenly, reducing defects and internal stress. At the same time, the existence of the chamfer can also play a certain guiding and restraining role on the material, which helps to improve the forming accuracy and surface quality of the bolt.

[0010] The utility model is further arranged that: an installation cavity for installing an upper mold core is arranged at the position of the lower end of the upper mold shell corresponding to the lower mold cavity, the upper mold core includes an upper mold cavity for forming a bolt head, the upper mold cavity is arranged to pass through from top to bottom, the upper mold cavity is arranged opposite to the lower mold cavity, one end of the upper mold punch rod is fixed on the upper mold pad, and the other end extends into the upper mold cavity.

[0011] By adopting the above technical solution, assembly is convenient and flexible adjustment can be made according to bolts of different specifications and shapes, thereby improving the versatility and adaptability of the mold.

[0012] The embodiments describe the specific implementation of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the stepwise cold upsetting of a blank according to an embodiment of the utility model;

[0014] Figure 2 It is a cross-sectional view of a cold heading device according to an embodiment of the utility model;

[0015] Figure 3 It is a partial structural schematic diagram of a lower die of an upsetting die according to an embodiment of the utility model;

[0016] Figure 4 It is a partial structural schematic diagram of the lower die of the double upsetting die according to an embodiment of the utility model;

[0017] Figure 5 It is a partial structural schematic diagram of the lower die of the three-heading die of the embodiment of the utility model;

[0018] Figure 6 It is a partial structural schematic diagram of a four-heading die according to an embodiment of the utility model;

[0019] Figure 7 It is a partial structural schematic diagram of a five-upsetting die according to an embodiment of the utility model;

[0020] Figure 8 It is a schematic diagram of the partial structure of the final upsetting die of an embodiment of the utility model.

[0021] Figure numerals: 1. a forging die, 11. a lower die of a forging die, 111. a lower die shell of a forging die, 112. a lower die core of a forging die, 1121. a first section of the first die core, 1122. a second section of the first die core, 113. a lower die pad of a forging die, 114. a lower die punch of a forging die, 115. a lower mold cavity of a forging die, 12. a forging die 1. Upper die of a forging die, 121. Upper die shell of a forging die, 122. Upper die pad of a forging die, 123. Upper die punch of a forging die; 2. Second forging die, 21. Lower die of the second forging die, 211. Lower die shell of the second forging die, 212. Lower die core of the second forging die, 2121. No. 2 die core of the first section, 2122. No. 2 die core of the second section, 2123. No. 2 die core of the third section Die core, 213. Lower die pad of the second upsetting die, 214. Lower die punch of the second upsetting die, 215. Lower mold cavity of the second upsetting die, 22. Upper die of the second upsetting die, 221. Upper die shell of the second upsetting die, 222. Upper die pad of the second upsetting die, 223. Upper die punch of the second upsetting die; 3. Third upsetting die, 31. Lower die of the third upsetting die, 311. Lower die of the third upsetting die Mold shell, 312. Lower mold core of three-heading mold, 3121. No. 3 mold core of the first section, 3122. No. 3 mold core of the second section, 3123. No. 3 mold core of the third section, 3124. No. 3 mold core of the fourth section, 313. Lower mold pad of three-heading mold, 314. Lower mold punch of three-heading mold, 315. Lower mold cavity of three-heading mold, 32. Upper mold of three-heading mold, 321. The upper die shell of the three-heading die, 322. The upper die pad of the three-heading die, 323. The upper die punch of the three-heading die; 4. The four-heading die, 41. The lower die of the four-heading die, 411. The lower die shell of the four-heading die, 412. The lower die core of the four-heading die, 4121. The first section No. 4 die core, 4122. The second section No. 4 die core, 4123. The third section No. 4 die core, 4124. Section 4 No. 4 mold core, 413. Lower mold pad of four-upsetting mold, 414. Lower mold punch of four-upsetting mold, 415. Lower mold cavity of four-upsetting mold, 42. Upper mold of four-upsetting mold, 421. Upper mold shell of four-upsetting mold, 4211. Primary molding cavity, 422. Upper mold pad of four-upsetting mold, 423. Upper mold punch of four-upsetting mold; 5. Five-upsetting mold, 51. Five-upsetting mold 511. The lower die shell of the five-upsetting die, 512. The lower die core of the five-upsetting die, 5121. The first section of the five-upsetting die core, 5122. The second section of the five-upsetting die core, 5123. The third section of the five-upsetting die core, 5124. The fourth section of the five-upsetting die core, 513. The lower die pad of the five-upsetting die, 514. The lower die punch of the five-upsetting die, 515. The lower mold cavity of the five-upsetting die, 52. Upper die of the five-forging die, 521. Upper die shell of the five-forging die, 5211. Second forming cavity, 522. Upper die pad of the five-forging die, 523. Upper die punch of the five-forging die; 6. Final forging die, 61. Lower die of the final forging die, 611. Lower die shell of the final forging die, 612. Lower die core of the final forging die, 6121. No. 6 die core of the first section, 6122.Section 2 No. 6 mold core, 6123. Section 3 No. 6 mold core, 6124. Section 4 No. 6 mold core, 613. Lower mold pad of final forging mold, 614. Lower mold punch of final forging mold, 615. Lower mold cavity of final forging mold, 62. Upper mold of final forging mold, 621. Upper mold shell of final forging mold, 6211. Final forming cavity, 622. Upper mold pad of final forging mold, 623. Upper mold punch of final forging mold. . DETAILED DESCRIPTION

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0023] See attached Figure 1-8 The present embodiment discloses a cold heading device for automobile chassis suspension bolts, comprising a cutting mechanism, an ejection mechanism, a conveying mechanism and six dies, wherein the cutting mechanism cuts off the blank, and the ejection mechanism lifts the blank; the conveying mechanism moves and feeds between the ejection mechanism and the six dies; the six dies comprise: a first heading die 1 for chamfering the lower end of the initial blank, a second heading die 2 for shrinking the lower end of the first blank for the first time, a third heading die 3 for shrinking the lower end of the second blank for the second time, a fourth heading die 4 for shrinking the lower end of the third blank for the third time and preliminarily stamping the head, and a fourth heading die 5 for further stamping the head of the fourth blank. The six molds include a lower mold and an upper mold, the lower mold includes a lower mold shell, a lower mold core, a lower mold punch, a lower mold locking nut and a lower mold pad, the lower mold core is arranged in the lower mold shell, a lower mold cavity is arranged in the lower mold core, the lower mold pad is arranged below the lower mold core, the lower mold locking nut is connected with the lower mold shell to fix the lower mold pad and the lower mold core, and one end of the lower mold punch passes through the lower mold pad and extends into the lower mold cavity; the upper mold includes an upper mold shell, an upper mold pad and an upper mold punch, and the upper mold pad is arranged in the upper mold shell.

[0024] The present embodiment is further configured as follows: the lower die core 112 of the first upsetting die 1 comprises a first section No. 1 die core 1121 for shaping the main rod of the initial blank and a second section No. 1 die core 1122 for chamfering the lower end of the initial blank; the lower die core 212 of the second upsetting die 2 comprises a first section No. 2 die core 2121 for shaping the main rod of the first blank, a second section No. 2 die core 2122 for transitionally forming the first section of the contraction rod at the lower end of the first blank, and a third section No. 2 die core 2123 for extending the first section of the contraction rod of the first blank; the lower die core 312 of the third upsetting die 3 comprises a first section No. 3 die core 3121 for shaping the main rod of the second blank, a second section No. 4 die core 3122 for chamfering .... The lower end of the rod is transitionally formed into a first-section shrink rod, the third-section third mold core 3123 is used to transitionally form the first-section shrink rod of the second blank into a second-section shrink rod, and the fourth-section third mold core 3124 is used to transitionally form the lower end of the second-section shrink rod of the second blank into a third-section shrink rod; the lower mold core 412 of the four-heading mold 4 includes a first-section fourth mold core 4121 for shaping the main rod of the third blank, a second-section fourth mold core 4122 for simultaneously forming the first-section shrink rod and the second-section shrink rod at the lower end of the main rod of the third blank, a third-section fourth mold core 4123 is used to transitionally form the lower end of the second-section shrink rod of the third blank into a third-section shrink rod, and a fourth-section fourth mold core 4124 is used to extend the third-section shrink rod of the third blank. The fourth section No. 4 mold core 4124 of the long forming, the upper mold shell 421 of the four-upsetting mold 4 includes a primary forming cavity 4211 for forming the head of the main rod of the third blank; the lower mold core 512 of the five-upsetting mold 5 includes a first section No. 5 mold core 5121 for shaping the main rod of the fourth blank, a second section No. 5 mold core 5122 for simultaneously forming the first section shrink rod and the second section shrink rod at the lower end of the main rod of the fourth blank, a third section No. 5 mold core 5123 for transitionally forming the lower end of the second section shrink rod of the fourth blank into the third section shrink rod, and a fourth section No. 5 mold core 5124 for transitionally forming the lower end of the third section shrink rod of the fourth blank into the fourth section shrink rod, the upper mold shell 521 of the five-upsetting mold 5 includes A second molding cavity 5211 for further molding the main rod head of the fourth blank; the lower mold core 612 of the final forging mold 6 includes a first-section No. 6 mold core 6121 for shaping the main rod of the fifth blank, a second-section No. 6 mold core 6122 for simultaneously molding the first and second shrinkage rods at the lower end of the main rod of the fifth blank, a third-section No. 6 mold core 6123 for simultaneously molding the third and fourth shrinkage rods at the lower end of the second shrinkage rod of the fifth blank, and a fourth-section No. 6 mold core 6124 for extending and molding the fourth shrinkage rod of the fifth blank; the upper mold shell 621 of the final forging mold 6 includes a final molding cavity 6211 for molding the main rod head of the fourth blank into an external hexagonal umbrella head.

[0025] The present embodiment is further configured as follows: the second section No. 1 mold core 1122 includes a first rod shrinkage cavity, the chamfer of the first rod shrinkage cavity is a1, 70°≤a1<90°; the second section No. 2 mold core 2122 includes a second rod shrinkage cavity, the chamfer of the second rod shrinkage cavity is a2, a2=60°; the second section No. 3 mold core 3122 includes a third rod shrinkage cavity, the chamfer of the third rod shrinkage cavity is a3, a3=a2=60°, the third section No. 3 mold core 3123 includes a fourth rod shrinkage cavity The fourth rod cavity has a chamfer of a4, a4=a3=60°, the fourth section No. 3 mold core 3124 includes a fifth rod cavity, the chamfer of the fifth rod cavity is a5, 30°≤a5<a4; the second section No. 4 mold core 4122 includes a sixth rod cavity, the sixth rod cavity includes an upper rod segment, a middle rod segment and a lower rod segment, the chamfer between the upper rod segment and the middle rod segment is a6, the chamfer between the middle rod segment and the lower rod segment is a7, a6=a7=6 0°, the third section No. 4 mold core 4123 includes a seventh shrink rod cavity, the chamfer of the seventh shrink rod cavity is a8, 30°≤a8=a5; the second section No. 5 mold core 5122 includes an eighth shrink rod cavity, the eighth shrink rod cavity includes an upper shrink rod segment, a middle shrink rod segment and a lower shrink rod segment, the chamfer between the upper shrink rod segment and the middle shrink rod segment is a9, the chamfer between the middle shrink rod segment and the lower shrink rod segment is a10, a9=a10=60°, the third section No. 5 mold core 5123 includes a The ninth retractable rod cavity has a chamfer of a11, a11=60°; the fourth section No. 5 mold core 5124 includes a tenth retractable rod cavity, and the chamfer of the tenth retractable rod cavity is a12, 30°≤a12=a8; the second section No. 6 mold core 6122 includes an eleventh retractable rod cavity, and the eleventh retractable rod cavity includes an upper retractable rod segment, a middle retractable rod segment and a lower retractable rod segment, the chamfer between the upper retractable rod segment and the middle retractable rod segment is a13, and the chamfer between the middle retractable rod segment and the lower retractable rod segment is a14, a13=a14=60°; the third section No. 6 mold core 6123 includes a twelfth retractable rod cavity, and the twelfth retractable rod cavity includes an upper retractable rod segment, a middle retractable rod segment and a lower retractable rod segment, the chamfer between the upper retractable rod segment and the middle retractable rod segment is a15, and the chamfer between the middle retractable rod segment and the lower retractable rod segment is a16, a15=60°, a16=30°.

[0026] This embodiment is further configured as follows: an installation cavity for installing an upper mold core is provided at the position of the lower end of the upper mold shell corresponding to the lower mold cavity, the upper mold core includes an upper mold cavity for forming a bolt head, the upper mold cavity is arranged to pass through from top to bottom, the upper mold cavity is arranged opposite to the lower mold cavity, one end of the upper mold punch is fixed on the upper mold pad, and the other end extends into the upper mold cavity.

[0027] The above-mentioned "between" does not only refer to directions and positions, but also includes the interaction between different parts. The above-mentioned "upper", "middle" and "lower" are only relative positions for the convenience of explanation, and does not exclude the possibility of using other terms.

[0028] These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitations interpreted as these terms are contrary to the spirit of the present invention.

Claims

1. A cold heading device for automobile chassis suspension bolts, characterized in that: The invention comprises a cutting mechanism, an ejection mechanism, a conveying mechanism and six dies, wherein the cutting mechanism cuts the blank, and the ejection mechanism lifts the blank; the conveying mechanism moves and feeds between the ejection mechanism and the six dies; the six dies comprise: a first upsetting die for chamfering the lower end of the initial blank, a second upsetting die for shrinking the lower end of the first blank for the first time, a third upsetting die for shrinking the lower end of the second blank for the second time, a fourth upsetting die for shrinking the lower end of the third blank for the third time and performing preliminary stamping of the head, a fifth upsetting die for further stamping the head of the fourth blank, and a fifth upsetting die for stamping the head of the fifth blank. The six molds are respectively composed of a lower mold and an upper mold, wherein the lower mold comprises a lower mold shell, a lower mold core, a lower mold punch, a lower mold locking nut and a lower mold pad, the lower mold core is arranged in the lower mold shell, a lower mold cavity is arranged in the lower mold core, the lower mold pad is arranged below the lower mold core, the lower mold locking nut is connected with the lower mold shell to fix the lower mold pad and the lower mold core, and one end of the lower mold punch passes through the lower mold pad and extends into the lower mold cavity; the upper mold comprises an upper mold shell, an upper mold pad and an upper mold punch, and the upper mold pad is arranged in the upper mold shell.

2. The cold heading device for automobile chassis suspension bolts according to claim 1, characterized in that: The lower die core of the first upsetting die includes a first section No. 1 die core for shaping the main rod of the initial blank and a second section No. 1 die core for chamfering the lower end of the initial blank; the lower die core of the second upsetting die includes a first section No. 2 die core for shaping the main rod of the first blank, a second section No. 2 die core for transitionally forming the first section of the lower end of the first blank into a first section of a retractable rod, and a third section No. 2 die core for extending the first section of the retractable rod of the first blank; the lower die core of the third upsetting die includes a first section No. 3 die core for shaping the main rod of the second blank, a second section No. 4 die core for transitionally forming the lower end of the main rod of the second blank into the first section of a retractable rod, and a third section No. 5 die core for extending the first section of the retractable rod of the first blank. The second section No. 3 mold core of the rod, the third section No. 3 mold core for transitionally forming the first section of the second blank into the second section of the shrink rod, and the fourth section No. 3 mold core for transitionally forming the lower end of the second section of the shrink rod of the second blank into the third section of the shrink rod; the lower mold core of the four-upsetting mold includes the first section No. 4 mold core for shaping the main rod of the third blank, the second section No. 4 mold core for simultaneously forming the first section of the shrink rod and the second section of the shrink rod at the lower end of the main rod of the third blank, the third section No. 4 mold core for transitionally forming the lower end of the second section of the shrink rod of the third blank into the third section of the shrink rod, and the third section No. 4 mold core for extending the third section of the shrink rod of the third blank into a third section of the shrink rod. The fourth section No. 4 mold core of the four-upsetting mold includes a primary molding cavity for molding the head of the main rod of the third blank; the lower mold core of the five-upsetting mold includes a first section No. 5 mold core for shaping the main rod of the fourth blank, a second section No. 5 mold core for simultaneously molding the first section shrink rod and the second section shrink rod at the lower end of the main rod of the fourth blank, a third section No. 5 mold core for transitionally molding the lower end of the second section shrink rod of the fourth blank into the third section shrink rod, and a fourth section No. 5 mold core for transitionally molding the lower end of the third section shrink rod of the fourth blank into the fourth section shrink rod, and the upper mold shell of the five-upsetting mold includes a mold core for the first section No. 5 mold core for molding the first section shrink rod and the second section shrink rod at the lower end of the second section shrink rod of the fourth blank into the fourth section shrink rod. A second molding cavity for further molding the heads of the main rods of the fourth blank; the lower mold core of the final forging mold includes a first-section No. 6 mold core for shaping the main rod of the fifth blank, a second-section No. 6 mold core for simultaneously molding the first-section shrinkage rod and the second-section shrinkage rod at the lower end of the main rod of the fifth blank, a third-section No. 6 mold core for simultaneously molding the third-section shrinkage rod and the fourth-section shrinkage rod at the lower end of the second-section shrinkage rod of the fifth blank, and a fourth-section No. 6 mold core for extending and molding the fourth-section shrinkage rod of the fifth blank; the upper mold shell of the final forging mold includes a final molding cavity for molding the head of the main rod of the fourth blank into an external hexagonal umbrella head.

3. The cold heading device for automobile chassis suspension bolts according to claim 2, characterized in that: The second section No. 1 mold core includes a first rod-shrinking cavity, and the chamfer of the first rod-shrinking cavity is a1, 70°≤a1<90°; the second section No. 2 mold core includes a second rod-shrinking cavity, and the chamfer of the second rod-shrinking cavity is a2, a2=60°; the second section No. 3 mold core includes a third rod-shrinking cavity, and the chamfer of the third rod-shrinking cavity is a3, a3=a2=60°, the third section No. 3 mold core includes a fourth rod-shrinking cavity, and the chamfer of the fourth rod-shrinking cavity is a4, a4=a3=60°, the fourth section No. 3 mold core includes a fifth rod-shrinking cavity, and the chamfer of the fifth rod-shrinking cavity is a5, 30°≤a5<a4; the second section No. 4 mold core includes a sixth rod-shrinking cavity, and the sixth rod-shrinking cavity includes an upper rod-shrinking segment, a middle rod-shrinking segment and a lower rod-shrinking segment, the chamfer between the upper rod-shrinking segment and the middle rod-shrinking segment is a6, the chamfer between the middle rod-shrinking segment and the lower rod-shrinking segment is a7, a6=a7=60°, the third section No. 3 mold core includes a fourth rod-shrinking cavity, and the chamfer of the fourth rod-shrinking cavity is a4, a4=a3=60°, the fourth section No. 3 mold core includes a fifth rod-shrinking cavity, and the chamfer of the fifth rod-shrinking cavity is a5, 30°≤a5<a4; the second section No. 4 mold core includes a sixth rod-shrinking cavity, and the sixth rod-shrinking cavity includes an upper rod-shrinking segment, a middle rod-shrinking segment and a lower rod-shrinking segment, the chamfer between the upper The fourth section mold core includes the seventh shrink rod cavity, and the chamfer of the seventh shrink rod cavity is a8, 30°≤a8=a5; the second section fifth mold core includes the eighth shrink rod cavity, and the eighth shrink rod cavity includes an upper shrink rod segment, a middle shrink rod segment and a lower shrink rod segment, the chamfer between the upper shrink rod segment and the middle shrink rod segment is a9, and the chamfer between the middle shrink rod segment and the lower shrink rod segment is a10, a9=a10=60°, the third section fifth mold core includes the ninth shrink rod cavity, the The chamfer of the nine-retracted rod cavity is a11, a11=60°, the fourth section No. 5 mold core includes the tenth retracted rod cavity, the chamfer of the tenth retracted rod cavity is a12, 30°≤a12=a8; the second section No. 6 mold core includes the eleventh retracted rod cavity, the eleventh retracted rod cavity includes an upper retracted rod segment, a middle retracted rod segment and a lower retracted rod segment, the chamfer between the upper retracted rod segment and the middle retracted rod segment is a13, the chamfer between the middle retracted rod segment and the lower retracted rod segment is a14, a13=a14=60°, the third section No. 6 mold core includes the twelfth retracted rod cavity, the twelfth retracted rod cavity includes an upper retracted rod segment, a middle retracted rod segment and a lower retracted rod segment, the chamfer between the upper retracted rod segment and the middle retracted rod segment is a15, the chamfer between the middle retracted rod segment and the lower retracted rod segment is a16, a15=60°, a16=30°.

4. The cold heading device for automobile chassis suspension bolts according to claim 1, characterized in that: An installation cavity for installing an upper mold core is arranged at the position of the lower end of the upper mold shell corresponding to the lower mold cavity. The upper mold core includes an upper mold cavity for forming a bolt head. The upper mold cavity is arranged to pass through from top to bottom. The upper mold cavity is arranged opposite to the lower mold cavity. One end of the upper mold punch is fixed on the upper mold pad, and the other end extends into the upper mold cavity.

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