Hollow bolt cold heading die set

Abstract

The utility model discloses a hollow bolt cold heading die set which 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 positioning hole into a first pre-upset hole, upsets the first pre-upset piece to form a step, and forms a second pre-upset piece. And the third cold heading die extrudes the first pre-upset hole in the forward direction, the first pre-upset hole is upset into a second pre-upset hole, the first pre-upset rod is upset to form a second pre-upset rod, and a third pre-upset part is formed. And the second pre-upset hole is extruded in the forward direction through the fourth cold upsetting die, the second pre-upset hole is upset into a third pre-upset hole, the second pre-upset rod is upset to form a third pre-upset rod, and a fourth pre-upset part is formed. And the third pre-upset hole is extruded in the forward direction through the fifth cold upsetting die, the third pre-upset hole is upset into a fourth pre-upset hole, and a fifth pre-upset part is formed. And the sixth cold heading die upsets the fourth pre-upset hole to form a finished product.

Description

Technical Field

[0001] The utility model belongs to a cold heading die set, in particular to a hollow bolt cold heading die set. Background Art

[0002] Hollow bolts are widely used in the automotive industry where lightweight, high strength and compact space are required, such as engine compartments, chassis suspensions, etc. The special structure of hollow bolts makes them particularly suitable for situations where space is small but sufficient bearing capacity is required.

[0003] When manufacturing large quantities of hollow bolts, cold heading is usually used to achieve less cutting or even no cutting. Controlling the wall thickness of the hollow bolts during cold heading, forming and maintaining the size and shape of the center hole is a major difficulty. If the wall thickness is too thin, the bolt strength may be insufficient. If the wall thickness is too thick, the weight and material consumption will increase. If the deformation is too large, cracks or breaks may occur.

[0004] Therefore, the above situation needs to be resolved urgently. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a cold heading die set, specifically a hollow bolt cold heading die set, which can accurately control the deformation amount at each stage to ensure that the wall thickness of each part of the bolt, especially the hollow part, is uniform.

[0006] Technical solution: In order to achieve the above-mentioned purpose, a hollow bolt cold heading die set 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 shrinks one end of the blank to form a first pre-heading rod, and at the same time, a first positioning hole is formed in the center of the other end of the blank away from the first pre-heading rod to form a first pre-heading piece. The second cold heading die upsets the first positioning hole into a first pre-heading hole, and at the same time, the second cold heading die upsets one end of the first pre-heading piece close to the first positioning hole to form a step to form a second pre-heading piece. The third cold heading die positively extrudes the first pre-heading hole, upsets the first pre-heading hole into a second pre-heading hole, and upsets the first pre-heading rod to form a second pre-heading rod to form a third pre-heading piece. The fourth cold heading die extrude the second pre-forging hole forward, and the second pre-forging hole is forged into the third pre-forging hole. The second pre-forging rod is forged to form the third pre-forging rod, thereby forming a fourth pre-forging part. The fifth cold heading die extrude the third pre-forging hole forward, and the third pre-forging hole is forged into the fourth pre-forging hole, thereby forming a fifth pre-forging part. The sixth cold heading die punches through the fourth pre-forging hole to form a finished product. The utility model uses six sets of dies and multiple steps of cold heading forming to accurately control the flow and deformation of the material, so that the deformation amount in each step is smaller, and the rod and the central control part are gradually formed to avoid cracks or fractures. While ensuring the size and surface finish of the screw, a hollow bolt with uniform wall thickness is formed.

[0007] Furthermore, in the above-mentioned hollow bolt cold heading die set, the first cold heading die includes a first main die and a first punch die. The first main die is provided with a first countersunk hole on one side close to the first punch die, a first die core is provided in the above-mentioned first countersunk hole, and a first die cavity is provided in the center of the first die core. The first main die is penetrated by a first push rod, and the first push rod extends into the first die cavity. The first punch rod is penetrated by a first punch rod, and a first punch is provided at the lower end of the first punch rod. The first punch rod is slidably connected to the first die, the first punch is slidably connected to the first die, the first punch rod abuts against the first punch, and the first punch rod slides in the first die, driving the first punch to cold-head the blank in the first die cavity to form a first pre-headed piece.

[0008] Furthermore, in the above-mentioned hollow bolt cold heading die set, the second cold heading die includes a second main die and a second punch die. The second main die is provided with a second countersunk hole on one side close to the second punch die, a second die core is provided in the above-mentioned second countersunk hole, and a second die cavity is provided in the center of the second die core. A second push rod is passed through the second main die, and the second push rod extends into the second die cavity. A second punch rod is passed through the second punch die, a second punch is provided at the lower end of the second punch rod, the second punch rod is slidably connected to the second punch die, the second punch rod is slidably connected to the second punch die, the second punch rod abuts against the second punch, and the second punch rod slides in the second punch die, driving the second punch to cold-head the first pre-headed piece in the second die cavity to form a second pre-headed piece.

[0009] Furthermore, in the above-mentioned hollow bolt cold heading die set, the third cold heading die includes a third main die and a third punch die. The third main die is provided with a third countersunk hole on one side close to the third punch die, a third die core is provided in the above-mentioned third countersunk hole, and a third die cavity is provided in the center of the third die core. A third ejector rod is passed through the third main die, and the third ejector rod extends into the third die cavity. A third punch rod is passed through the third punch die, a third punch is provided at the lower end of the third punch rod, the third punch rod and the third die are slidably connected, the third punch and the third die are slidably connected, the third punch rod and the third punch are abutted, and the third punch rod slides in the third die, driving the third punch to cold-head the second pre-headed piece in the third die cavity to form a third pre-headed piece.

[0010] Furthermore, in the above-mentioned hollow bolt cold heading die set, the fourth cold heading die includes a fourth main die and a fourth punch die. The fourth main die is provided with a fourth countersunk hole on one side close to the fourth punch die, a fourth die core is provided in the above-mentioned fourth countersunk hole, and a fourth die cavity is provided in the center of the fourth die core. The fourth main die is provided with a fourth ejector rod, and the fourth ejector rod extends into the fourth die cavity. The fourth punch die is provided with a fourth punch rod, a fourth punch is provided at the lower end of the fourth punch rod, the fourth punch rod and the fourth die are slidably connected, the fourth punch and the fourth die are slidably connected, the fourth punch rod and the fourth punch are abutted, the fourth punch rod slides in the fourth die, and drives the fourth punch to cold-head the third pre-headed piece in the fourth die cavity to form a fourth pre-headed piece.

[0011] Furthermore, in the above-mentioned hollow bolt cold heading die set, the fifth cold heading die includes a fifth main die and a fifth punch die. A fifth countersunk hole is provided on the side of the fifth main die close to the fifth punch die, a fifth die core is provided in the above-mentioned fifth countersunk hole, and a fifth die cavity is provided in the center of the fifth die core. A fifth ejector rod is passed through the fifth main die, and the fifth ejector rod extends into the fifth die cavity. A fifth punch rod is passed through the fifth punch die, a fifth punch is provided on the lower side of the fifth punch rod, a fifth ejector mechanism is provided between the fifth punch rod and the fifth punch, the fifth punch rod is slidably connected to the fifth punch die, a fifth punch sleeve is provided on the outer sleeve of the fifth punch, the lower side of the fifth ejector mechanism abuts against the fifth punch sleeve, the lower side of the fifth ejector mechanism is connected to the fifth punch, the upper side of the fifth ejector mechanism abuts against the fifth punch rod, the fifth punch rod slides in the fifth punch die, and drives the fifth punch to cold-head the fourth pre-forged piece in the fifth die cavity. During the cold forging process, the fifth punch sleeve first contacts the fourth pre-forging piece, and the fifth punch sleeve guides the fifth punch to forge the third pre-forging hole into the fourth pre-forging hole to prevent the fifth punch from being offset. On the other hand, during the cold forging process, the lower end of the fifth punch sleeve contacts the fourth pre-forging piece, and the fifth punch continues to move downward. The fifth punch sleeve applies a reverse thrust to the fifth ejection mechanism, and then the fifth ejection mechanism ejects the fifth punch rod. The fifth ejection mechanism drives the fifth punch to move in the opposite direction and escape from the fourth pre-forging hole.

[0012] Furthermore, in the above-mentioned hollow bolt cold heading die set, the fifth ejection mechanism includes a fifth ejector block, a fifth ejector pin, a fifth positioning block, and a fifth slider. The fifth punch is provided with a fifth upper cavity and a fifth lower cavity, and the fifth upper cavity and the fifth lower cavity form a fifth step. The upper end of the fifth punch sleeve is provided in the fifth lower cavity, the fifth punch sleeve passes through the fifth punch and abuts against the upper side of the fourth pre-forging piece in the fifth die cavity, the fifth ejector block is provided on the upper side of the fifth step, the lower side of the fifth ejector block abuts against the fifth punch sleeve, the upper end of the fifth punch is fixedly connected to the fifth ejector block, the upper side of the fifth ejector block is provided with a fifth positioning block, the fifth positioning block is provided with a fifth ejector pin, the lower end of the fifth ejector pin passes through the fifth ejector block and abuts against the fifth punch sleeve, the upper end of the fifth ejector pin abuts against the fifth punch rod, the upper side of the fifth positioning block is provided with a fifth slider, the fifth slider is a hollow structure, the fifth punch rod passes into the interior of the fifth slider, and the fifth punch rod slides in the fifth slider. During the cold heading process, the fifth punch rod pushes the fifth ejector pin to move downward, the fifth ejector pin pushes the fifth punch sleeve to move downward and contact the fourth pre-headed part, the fifth punch rod pushes the fifth positioning block and then pushes the fifth ejector block to slide downward, and the fifth punch fixedly connected to the fifth ejector block moves downward to cold head the fourth pre-headed part. The fifth punch die continues to move downward, the fifth punch sleeve applies a reverse thrust to the fifth ejector pin, the fifth ejector pin slides upward, and pushes the fifth punch rod upward. Then the fifth punch sleeve contacts the fifth ejector block, applies a reverse thrust to the fifth ejector block, and the fifth ejector block drives the fifth punch to move in the opposite direction and escape from the fourth pre-headed hole.

[0013] Furthermore, in the above-mentioned hollow bolt cold heading die set, the sixth cold heading die includes a sixth main die and a sixth punch die. The sixth main die is provided with a sixth countersunk hole on one side close to the sixth punch die, a sixth die core is provided in the above-mentioned sixth countersunk hole, and a sixth die cavity is provided in the center of the sixth die core. The sixth punch rod is penetrated by the sixth punch die, a sixth punch is provided at the lower end of the sixth punch rod, the sixth punch rod and the sixth punch die are slidably connected, the sixth punch and the sixth punch die are slidably connected, a sixth ejection mechanism is provided between the sixth punch rod and the sixth punch, a sixth punch sleeve is provided on the outer sleeve of the sixth punch, the lower side of the sixth ejection mechanism abuts against the sixth punch sleeve, the lower side of the sixth ejection mechanism is connected to the sixth punch, the upper side of the sixth ejection mechanism abuts against the sixth punch rod, the sixth punch rod slides in the sixth punch die, and drives the sixth punch to cold-head the fifth pre-forged piece in the sixth die cavity. During the cold forging process, the sixth punch sleeve first contacts the fifth pre-forging piece, and the sixth punch sleeve guides the sixth punch to forge the fourth pre-forging hole to prevent the sixth punch from deviating. On the other hand, during the cold forging process, the lower end of the sixth punch sleeve contacts the fifth pre-forging piece, and the sixth punch die continues to move downward. The sixth punch sleeve applies a reverse thrust to the sixth ejection mechanism, and the sixth ejection mechanism ejects the sixth punch rod, and the sixth ejection mechanism brings the sixth punch out of the hollow hole of the finished product.

[0014] Further, in the above-mentioned hollow bolt cold heading die set, the sixth ejection mechanism includes a sixth ejector block, a sixth ejector pin, a sixth positioning block, and a sixth slider. The sixth punch is provided with a sixth upper cavity and a sixth lower cavity, and the sixth upper cavity and the sixth lower cavity form a sixth step. The upper end of the sixth punch sleeve is provided in the sixth lower cavity, the sixth punch sleeve passes through the sixth punch and abuts against the upper side of the fifth pre-forging piece in the sixth die cavity 612, the sixth ejector block is provided on the upper side of the sixth step, the lower side of the sixth ejector block abuts against the sixth punch sleeve, the upper end of the sixth punch is fixedly connected to the sixth ejector block, the upper side of the sixth ejector block is provided with a sixth positioning block, the sixth positioning block is provided with a sixth ejector pin, the lower end of the sixth ejector pin passes through the sixth ejector block and abuts against the sixth punch sleeve, the upper end of the sixth ejector pin abuts against the sixth punch rod, the upper side of the sixth positioning block is provided with a sixth slider, the sixth slider is a hollow structure, the sixth punch rod passes into the interior of the sixth slider, and the sixth punch rod slides in the sixth slider. During the cold heading process, the sixth punch rod pushes the sixth ejector pin downward, the sixth ejector pin pushes the sixth punch sleeve downward and contacts the fifth pre-headed part, the sixth punch rod pushes the sixth positioning block and then pushes the sixth ejector block to slide downward, and the sixth punch fixedly connected to the sixth ejector block moves downward to cold head the fifth pre-headed part. The sixth punch die continues to move downward, the sixth punch sleeve applies a reverse thrust to the sixth ejector pin, the sixth ejector pin slides upward, and pushes the sixth punch rod upward. Then the sixth punch sleeve contacts the sixth ejector block, applies a reverse thrust to the sixth ejector block, and the sixth ejector block drives the sixth punch to move in the opposite direction, and the hollow hole of the finished product is removed.

[0015] Furthermore, in the above hollow bolt cold heading die set, the sixth main die is provided with a waste hole, and the waste hole is connected to the sixth die cavity. During the punching process, the waste generated is discharged from the waste hole.

[0016] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the utility model hollow bolt cold heading die set, multiple steps of cold heading forming, can accurately control the flow and deformation of the material, so that the deformation amount of each step is smaller, the rod part and the central control part are gradually formed to avoid cracks or breakage, and a hollow bolt with uniform wall thickness is formed while ensuring the size and surface finish of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a process diagram of a hollow bolt cold heading die set of the utility model;

[0018] Figure 2 This is a die diagram of a hollow bolt cold heading die set of the utility model;

[0019] Figure 3 This is a cross-sectional view of the first cold heading die of the utility model;

[0020] Figure 4 This is a cross-sectional view of the second cold heading die of the utility model;

[0021] Figure 5 This is a cross-sectional view of the third cold heading die of the utility model;

[0022] Figure 6 This is a cross-sectional view of the fourth cold heading die of the utility model;

[0023] Figure 7 This is a cross-sectional view of the fifth cold heading die of the utility model;

[0024] Figure 8 This is a cross-sectional view of the sixth cold heading die of the utility model;

[0025] In the figure: 1, a first cold heading die, 11, a first main die, 110, a first pre-upsetting piece, 111, a first pre-upsetting rod, 1110, a first die cavity, 1111, a first die core, 112, a first positioning hole, 113, a first ejector rod, 12, a first punch die, 120, a second pre-upsetting piece, 1201, a first pre-upsetting hole, 121, first punch rod, 122, first punch, 123, step, 130, third pre-forging piece, 131, second pre-forging rod, 132, second pre-forging hole, 140, fourth pre-forging piece, 141, third pre-forging rod, 142, third pre-forging hole, 150, fifth pre-forging piece, 151, fourth pre-forging hole, 160, finished product, 2, second cold heading die, 21, second main die, 211, second die core, 212, second die cavity, 213, second ejector rod, 22, second punch, 221, second punch rod, 222, second punch, 3, third cold heading die, 31, third main die, 311, third die core, 312, third die cavity, 313, third ejector pin, 32, third punch, 321, third punch rod, 322, third punch, 4, fourth cold heading die, 41, fourth main die, 411, fourth die core, 412, fourth die cavity, 413, fourth ejector pin, 42, fourth punch, 421, fourth punch rod, 422, fourth punch, 5, fifth cold heading die, 51, fifth main die, 511, fifth die core, 512, fifth die cavity, 513, fifth ejector pin, 52, fifth punch, 521, fifth punch rod, 522, fifth punch, 523, fifth punch sleeve, 524, fifth ejector mechanism, 5241, fifth ejector block, 5242, fifth ejector pin, 5243, fifth positioning block, 5244, fifth slider , 525, the fifth upper cavity, 526, the fifth lower cavity, 527, the fifth step, 6, the sixth cold heading die, 61, the sixth main die, 611, the sixth core, 612, the sixth cavity, 62, the sixth punch, 621, the sixth punch rod, 622, the sixth punch, 623, the sixth punch sleeve, 624, the sixth ejector mechanism, 6241, the sixth ejector block, 6242, the sixth ejector pin, 6243, the sixth positioning block, 6244, the sixth slider, 625, the sixth upper cavity, 626, the sixth lower cavity, 627, the sixth step, 63, the waste hole. DETAILED DESCRIPTION

[0026] Example 1

[0027] like Figure 1-2A hollow bolt cold heading die set is shown, comprising 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 shrinks and forges one end of a blank 100 to form a first pre-forging rod 111, and at the same time forges a first positioning hole 112 at the center of the other end of the blank 100 away from the first pre-forging rod 111, to form a first pre-forging piece 110. The second cold heading die 2 forges the first positioning hole 112 into a first pre-forging hole 1201, and at the same time, the second cold heading die 2 forges one end of the first pre-forging piece 110 close to the first positioning hole 112 to form a step 123, to form a second pre-forging piece 120. The third cold heading die 3 positively extrude the first pre-upsetting hole 1201, and the first pre-upsetting hole 1201 is upset into the second pre-upsetting hole 132. The first pre-upsetting rod 111 is upset to form the second pre-upsetting rod 131, thereby forming the third pre-upsetting piece 130. The fourth cold heading die 4 positively extrude the second pre-upsetting hole 132, and the second pre-upsetting hole 132 is upset into the third pre-upsetting hole 142. The second pre-upsetting rod 131 is upset to form the third pre-upping rod 141, thereby forming the fourth pre-upping piece 140. The fifth cold heading die 5 positively extrude the third pre-upsetting hole 142, and the third pre-upsetting hole 142 is upset into the fourth pre-upping hole 151, thereby forming the fifth pre-upping piece 150. The sixth cold upsetting die 6 upsets the fourth pre-upsetting hole 151 to form a finished product 160 .

[0028] like Figure 3 A hollow bolt cold heading die set is shown, the first cold heading die 1 comprises a first main die 11 and a first punch die 12. The first main die 11 is provided with a first countersunk hole near the first punch die 12, the first countersunk hole is provided with a first die core 1111, and the center of the first die core 1111 is provided with a first die cavity 1110. The first main die 11 is penetrated with a first ejector rod 113, and the first ejector rod 113 extends into the first die cavity 1110. The first punch die 12 is penetrated with a first punch rod 121, and the lower end of the first punch rod 121 is provided with a first punch 122, the first punch rod 121 is slidably connected to the first punch die 12, the first punch 122 is slidably connected to the first punch die 12, the first punch rod 121 and the first punch 122 are in contact, the first punch rod 121 slides in the first punch die 12, and drives the first punch 122 to cold-head the blank 100 in the first die cavity 1110 to form a first pre-headed piece 110.

[0029] like Figure 4A hollow bolt cold heading die set is shown, and the second cold heading die 2 includes a second main die 21 and a second punch die 22. The second main die 21 is provided with a second countersunk hole near the second punch die 22, and a second die core 211 is provided in the second countersunk hole, and a second die cavity 212 is provided in the center of the second die core 211. A second ejector rod 213 is penetrated by the second main die 21, and the second ejector rod 213 extends into the second die cavity 212. A second punch rod 221 is penetrated by the second punch die 22, and a second punch 222 is provided at the lower end of the second punch rod 221. The second punch rod 221 is slidably connected to the second punch die 22, and the second punch 222 is slidably connected to the second punch die 22, and the second punch rod 221 abuts against the second punch 222, and the second punch rod 221 slides in the second punch die 22, driving the second punch 222 to cold-head the first pre-heading piece 110 in the second die cavity 212 to form a second pre-heading piece 120.

[0030] like Figure 5 A hollow bolt cold heading die set is shown, and the third cold heading die 3 includes a third main die 31 and a third punch die 32. A third countersunk hole is provided on the third main die 31 near the third punch die 32, and a third die core 311 is provided in the third countersunk hole, and a third die cavity 312 is provided at the center of the third die core 311. A third ejector rod 313 is penetrated by the third main die 31, and the third ejector rod 313 extends into the third die cavity 312. A third punch rod 321 is penetrated by the third punch die 32, and a third punch 322 is provided at the lower end of the third punch rod 321. The third punch rod 321 is slidably connected to the third punch die 32, and the third punch 322 is slidably connected to the third punch die 32. The third punch rod 321 abuts against the third punch 322, and the third punch rod 321 slides in the third punch die 32, driving the third punch 322 to cold-head the second pre-heading piece 120 in the third die cavity 312 to form a third pre-heading piece 130.

[0031] like Figure 6 A hollow bolt cold heading die set is shown, the fourth cold heading die 4 comprises a fourth main die 41 and a fourth punch die 42. A fourth countersunk hole is provided on the side of the fourth main die 41 close to the fourth punch die 42, a fourth die core 411 is provided in the fourth countersunk hole, and a fourth die cavity 412 is provided at the center of the fourth die core 411. A fourth ejector rod 413 is passed through the fourth main die 41, and the fourth ejector rod 413 extends into the fourth die cavity 412. The fourth die 42 is penetrated by a fourth punch rod 421, a fourth punch 422 is provided at the lower end of the fourth punch rod 421, the fourth punch rod 421 and the fourth die 42 are slidably connected, the fourth punch 422 and the fourth die 42 are slidably connected, the fourth punch rod 421 and the fourth punch 422 are abutted, the fourth punch rod 421 slides in the fourth die 42, driving the fourth punch 422 to cold forge the third pre-forging part 130 in the fourth die cavity 412 to form a fourth pre-forging part 140.

[0032] like Figure 7In the hollow bolt cold heading die set shown in the figure, the fifth cold heading die 5 comprises a fifth main die 51 and a fifth punch die 52. A fifth countersunk hole is provided on the side of the fifth main die 51 close to the fifth punch die 52, a fifth die core 511 is provided in the fifth countersunk hole, and a fifth die cavity 512 is provided at the center of the fifth die core 511. A fifth ejector 513 is passed through the fifth main die 51, and the fifth ejector 513 extends into the fifth die cavity 512. The fifth die 52 is penetrated by a fifth punch rod 521, a fifth punch 522 is provided on the lower side of the fifth punch rod 521, a fifth ejection mechanism 524 is provided between the fifth punch rod 521 and the fifth punch 522, the fifth punch rod 521 and the fifth die 52 are slidably connected, a fifth punch sleeve 523 is provided on the outer sleeve of the fifth punch 522, the lower side of the fifth ejection mechanism 524 abuts against the fifth punch sleeve 523, the lower side of the fifth ejection mechanism 524 is connected to the fifth punch 522, the upper side of the fifth ejection mechanism 524 abuts against the fifth punch rod 521, the fifth punch rod 521 slides in the fifth die 52, driving the fifth punch 522 to cold forge the fourth pre-forging piece 140 in the fifth die cavity 512. During the cold heading process, the fifth punch sleeve 523 first contacts the fourth pre-upsetting piece 140, and the fifth punch sleeve 523 guides the fifth punch 522 to upset the third pre-upsetting hole 142 into the fourth pre-upsetting hole 151, preventing the fifth punch 522 from deflecting. On the other hand, during the cold heading process, the lower end of the fifth punch sleeve 523 abuts against the fourth pre-upsetting piece 140 in the fifth die cavity 512, and the fifth die 52 continues to move downward. The fifth punch sleeve 523 applies a reverse thrust to the fifth ejection mechanism 524, and then the fifth ejection mechanism 524 ejects the fifth punch rod 521, and the fifth ejection mechanism 524 drives the fifth punch 522 to move in the reverse direction and escape from the fourth pre-upsetting hole 151. The fifth ejection mechanism 524 includes a fifth ejector block 5241, a fifth ejector pin 5242, a fifth positioning block 5243, and a fifth slider 5244. The fifth punch 52 is provided with a fifth upper cavity 525 and a fifth lower cavity 526, and the fifth upper cavity 525 and the fifth lower cavity 526 form a fifth step 527. The upper end of the fifth punch sleeve 523 is arranged in the fifth lower cavity 526, and the fifth punch sleeve 523 passes through the fifth punch 52 and abuts against the upper side of the fourth pre-forging piece 140, and the fifth ejector block 5241 is arranged on the upper side of the fifth step 527, and the lower side of the fifth ejector block 5241 abuts against the fifth punch sleeve 523, and the upper end of the fifth punch 522 is fixedly connected to the fifth ejector block 5241, and the upper side of the fifth ejector block 5241 is provided with a fifth positioning block 5243, and the fifth positioning block 5243 is penetrated by a fifth ejector pin 524 2. The lower end of the fifth ejector pin 5242 passes through the fifth ejector block 5241 and abuts against the fifth punch sleeve 523. The upper end of the fifth ejector pin 5242 abuts against the fifth punch rod 521. The fifth ejector pin 5242 is arranged around the center of the fifth punch rod 521. The fifth positioning block 5243 is provided with a fifth slider 5244 on the upper side. The fifth slider 5244 is a hollow structure. The fifth punch rod 521 penetrates into the interior of the fifth slider 5244, and the fifth punch rod 521 slides in the fifth slider 5244.During the cold heading process, the fifth punch rod 521 pushes the fifth ejector pin 5242 to move downward, and the fifth ejector pin 5242 pushes the fifth punch sleeve 523 to move downward and contact the fourth pre-forging piece 140. The fifth punch rod 521 pushes the fifth positioning block 5243 and then pushes the fifth ejector block 5241 to slide downward, and the fifth punch 522 fixedly connected to the fifth ejector block 5241 moves downward to cold-forge the fourth pre-forging piece 140. The fifth punch die 52 continues to move downward, and the fifth punch sleeve 523 applies a reverse thrust to the fifth ejector pin 5242, and the fifth ejector pin 5242 slides upward to push the fifth punch rod 521 upward. Then the fifth punch sleeve 523 contacts the fifth ejector block 5241, applies a reverse thrust to the fifth ejector block 5241, and the fifth ejector block 5241 drives the fifth punch 522 to move in the opposite direction and escape from the fourth pre-forging hole 151.

[0033] like Figure 8In the hollow bolt cold heading die set shown, the sixth cold heading die 6 comprises a sixth main die 61 and a sixth punch die 62. The sixth main die 61 is provided with a sixth countersunk hole on one side close to the sixth punch die 62, a sixth die core 611 is provided in the sixth countersunk hole, and a sixth die cavity 612 is provided in the center of the sixth die core 611. The sixth die 62 is penetrated by a sixth punch rod 621, a sixth punch 622 is provided at the lower end of the sixth punch rod 621, the sixth punch rod 621 and the sixth die 62 are slidably connected, the sixth punch 622 and the sixth die 62 are slidably connected, a sixth ejection mechanism 624 is provided between the sixth punch rod 621 and the sixth punch 622, a sixth punch sleeve 623 is provided on the outer sleeve of the sixth punch 622, the lower side of the sixth ejection mechanism 624 abuts against the sixth punch sleeve 623, the lower side of the sixth ejection mechanism 624 is connected to the sixth punch 622, the upper side of the sixth ejection mechanism 624 abuts against the sixth punch rod 621, the sixth punch rod 621 slides in the sixth die 62, driving the sixth punch 622 to cold forge the fifth pre-forging piece 150 in the sixth die cavity 612. During the cold heading process, the sixth punch sleeve 623 first contacts the fifth pre-forging piece 150, and the sixth punch sleeve 623 guides the sixth punch 622 to punch the fourth pre-forging hole 151 to prevent the sixth punch 622 from deflecting. On the other hand, during the cold heading process, the lower end of the sixth punch sleeve 623 contacts the fifth pre-forging piece 150, and the sixth punch 62 continues to move downward. The sixth punch sleeve 623 applies a reverse thrust to the sixth ejection mechanism 624, and the sixth ejection mechanism 624 ejects the sixth punch rod 621, and the sixth ejection mechanism 624 brings the sixth punch 622 out of the hollow hole of the finished product 160. The sixth ejection mechanism 624 includes a sixth ejector block 6241, a sixth ejector pin 6242, a sixth positioning block 6243, and a sixth slider 6244. The sixth punch 62 is provided with a sixth upper cavity 625 and a sixth lower cavity 626, and the sixth upper cavity 625 and the sixth lower cavity 626 form a sixth step 627. The upper end of the sixth punch sleeve 623 is arranged in the sixth lower cavity 626, the sixth punch sleeve 623 passes through the sixth punch die 62 and abuts against the upper side of the fifth pre-forging piece 150 in the sixth die cavity 612, the sixth top block 6241 is arranged on the upper side of the sixth step 627, the lower side of the sixth top block 6241 abuts against the sixth punch sleeve 623, the upper end of the sixth punch 622 is fixedly connected to the sixth top block 6241, the upper side of the sixth top block 6241 is provided with a sixth positioning block 6243, and the sixth positioning block 6243 passes through the sixth top block 6243. Needle 6242, the lower end of the sixth ejector pin 6242 passes through the sixth ejector block 6241 and abuts against the sixth punch sleeve 623, the upper end of the sixth ejector pin 6242 abuts against the sixth punch rod 621, the sixth ejector pin 6242 is arranged around the center of the sixth punch rod 621, and the sixth positioning block 6243 is provided with a sixth slider 6244 on the upper side. The sixth slider 6244 is a hollow structure, the sixth punch rod 621 penetrates into the interior of the sixth slider 6244, and the sixth punch rod 621 slides in the sixth slider 6244.During the cold heading process, the sixth punch rod 621 pushes the sixth ejector pin 6242 to move downward, and the sixth ejector pin 6242 pushes the sixth punch sleeve 623 to move downward and contact the fifth pre-forging piece 150. The sixth punch rod 621 pushes the sixth positioning block 6243 and then pushes the sixth ejector block 6241 to slide downward, and the sixth punch 622 fixedly connected to the sixth ejector block 6241 moves downward to cold-forge the fifth pre-forging piece 150. The sixth punch die 62 continues to move downward, and the sixth punch sleeve 623 applies a reverse thrust to the sixth ejector pin 6242, and the sixth ejector pin 6242 slides upward to push the sixth punch rod 621 upward. Then the sixth punch sleeve 623 contacts the sixth ejector block 6241, applies a reverse thrust to the sixth ejector block 6241, and the sixth ejector block 6241 drives the sixth punch 622 to move in the opposite direction to get out of the hollow hole of the finished product 160. The sixth main mold 61 is provided with a waste hole 63, and the waste hole 63 is connected to the sixth mold cavity 612. During the punching process, the waste generated is discharged from the waste hole 63.

[0034] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with this field can understand the content of the utility model and implement it accordingly, and they cannot limit the protection scope of the utility model in turn. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A hollow bolt cold heading die set, characterized in that: The cold heading die 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) shrinks one end of a blank (100) to form a first pre-forging rod (111), and simultaneously forms a first positioning hole (111) at the center of the other end of the blank (100) away from the first pre-forging rod (111). 112), forming a first pre-forging piece (110); the second cold forging die (2) forges the first positioning hole (112) into a first pre-forging hole (1201), and at the same time, the second cold forging die (2) forges one end of the first pre-forging piece (110) close to the first positioning hole (112) to form a step (123), forming a second pre-forging piece (120); the third cold forging die (3) forges the first pre-forging hole (1201) is forwardly extruded, the first pre-upsetting hole (1201) is upset into a second pre-upsetting hole (132), the first pre-upsetting rod (111) is upset to form a second pre-upsetting rod (131), and a third pre-upsetting piece (130) is formed; the fourth cold upsetting die (4) forwardly extrude the second pre-upsetting hole (132), the second pre-upsetting hole (132) is upset into a third pre-upsetting hole (142), the second pre-upsetting rod (111) is upset to form a second pre-upping rod (131), and a third pre-upsetting piece (130) is formed; The upsetting rod (131) is upset to form a third pre-upsetting rod (141), thereby forming a fourth pre-upsetting piece (140); the fifth cold upsetting die (5) positively extrude the third pre-upsetting hole (142), and the third pre-upsetting hole (142) is upset to form a fourth pre-upsetting hole (151), thereby forming a fifth pre-upsetting piece (150); the sixth cold upsetting die (6) upsets the fourth pre-upsetting hole (151), thereby forming a finished product (160).

2. The hollow bolt 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 countersunk hole is provided on a side of the first main die (11) close to the first punch die (12); a first die core (1111) is provided in the first countersunk hole; a first die cavity (1110) is provided at the center of the first die core (1111); a first ejector rod (113) is passed through the first main die (11), and the first ejector rod (113) extends into the first die cavity (1110); a first punch die (12) is passed through the first punch die A head rod (121), a first punch (122) is provided at the lower end of the first punch rod (121), the first punch rod (121) and the first die (12) are slidably connected, the first punch (122) and the first die (12) are slidably connected, the first punch rod (121) and the first punch (122) are in abutment with each other, the first punch rod (121) slides in the first die (12), and drives the first punch (122) to cold-forge the blank (100) in the first die cavity (1110).

3. The hollow bolt 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 countersunk hole is provided on a side of the second main die (21) close to the second punch die (22); a second die core (211) is provided in the second countersunk hole; a second die cavity (212) is provided at the center of the second die core (211); a second ejector rod (213) is passed through the second main die (21), and the second ejector rod (213) extends into the second die cavity (212); a second punch rod (213) is passed through the second punch die (22) 221), a second punch (222) is provided at the lower end of the second punch rod (221), the second punch rod (221) and the second die (22) are slidably connected, the second punch (222) and the second die (22) are slidably connected, the second punch rod (221) and the second punch (222) are abutted, the second punch rod (221) slides in the second die (22), driving the second punch (222) to cold-forge the first pre-forged piece (110) in the second die cavity (212).

4. The hollow bolt 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 countersunk hole is provided on a side of the third main die (31) close to the third punch die (32); a third die core (311) is provided in the third countersunk hole; a third die cavity (312) is provided at the center of the third die core (311); a third ejector rod (313) is passed through the third main die (31), and the third ejector rod (313) extends into the third die cavity (312); a third punch rod (313) is passed through the third punch die (32); 321), a third punch (322) is provided at the lower end of the third punch rod (321), the third punch rod (321) and the third die (32) are slidably connected, the third punch (322) and the third die (32) are slidably connected, the third punch rod (321) and the third punch (322) are abutted, the third punch rod (321) slides in the third die (32), and drives the third punch (322) to cold-forge the second pre-forging piece (120) in the third die cavity (312).

5. The hollow bolt 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 countersunk hole is provided on a side of the fourth main die (41) close to the fourth punch die (42); a fourth die core (411) is provided in the fourth countersunk hole; a fourth die cavity (412) is provided at the center of the fourth die core (411); a fourth ejector rod (413) is passed through the fourth main die (41), and the fourth ejector rod (413) extends into the fourth die cavity (412); a fourth punch rod (413) is passed through the fourth punch die (42); 421), a fourth punch (422) is provided at the lower end of the fourth punch rod (421), the fourth punch rod (421) and the fourth die (42) are slidably connected, the fourth punch (422) and the fourth die (42) are slidably connected, the fourth punch rod (421) and the fourth punch (422) are abutted, the fourth punch rod (421) slides in the fourth die (42), driving the fourth punch (422) to cold-forge the third pre-forging piece (130) in the fourth die cavity (412).

6. The hollow bolt 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 countersunk hole is provided on a side of the fifth main die (51) close to the fifth punch die (52); a fifth die core (511) is provided in the fifth countersunk hole; a fifth die cavity (512) is provided at the center of the fifth die core (511); a fifth ejector rod (513) is passed through the fifth main die (51); the fifth ejector rod (513) extends into the fifth die cavity (512); a fifth punch rod (521) is passed through the fifth punch die (522); a fifth punch rod (521) is provided on the lower side of the fifth punch rod (521); a fifth ejector mechanism (524) is provided between the fifth punch rod (521) and the fifth punch (522); the fifth punch rod (521) and the fifth punch die (522) are connected to each other. (52) is slidably connected, the outer sleeve of the fifth punch (522) is provided with a fifth punch sleeve (523), the lower side of the fifth ejection mechanism (524) is in contact with the fifth punch sleeve (523), the lower side of the fifth ejection mechanism (524) is connected to the fifth punch (522), the upper side of the fifth ejection mechanism (524) is in contact with the fifth punch rod (521), the fifth punch rod (521) slides in the fifth die (52), driving the fifth punch (522) to cold-forge the fourth pre-forging piece (140) in the fifth die cavity (512); the fifth punch sleeve (523) pushes the fifth ejection mechanism (524) to eject the fifth punch rod (521), and the fifth ejection mechanism (524) drives the fifth punch (522) to escape from the fourth pre-forging hole (151).

7. The hollow bolt cold heading die set according to claim 6, characterized in that: The fifth ejection mechanism (524) comprises a fifth ejector block (5241), a fifth ejector pin (5242), a fifth positioning block (5243), and a fifth slider (5244); the fifth punch die (52) is provided with a fifth upper cavity (525) and a fifth lower cavity (526); the fifth upper cavity (525) and the fifth lower cavity (526) form a fifth step (527); the upper end of the fifth punch sleeve (523) is arranged in the fifth lower cavity (526); the fifth punch sleeve (523) passes through the fifth punch die (52) and abuts against the upper side of the fourth pre-forging piece (140); the fifth ejector block (5241) is arranged on the upper side of the fifth step (527); the lower side of the fifth ejector block (5241) abuts against the fifth punch sleeve (523); The upper end of the head (522) is fixedly connected to the fifth ejector block (5241); a fifth positioning block (5243) is provided on the upper side of the fifth ejector block (5241); a fifth ejector pin (5242) is passed through the fifth positioning block (5243); the lower end of the fifth ejector pin (5242) passes through the fifth ejector block (5241) and abuts against the fifth punch sleeve (523); the upper end of the fifth ejector pin (5242) abuts against the fifth punch rod (521); a fifth slider (5244) is provided on the upper side of the fifth positioning block (5243); the fifth slider (5244) is a hollow structure; the fifth punch rod (521) passes into the interior of the fifth slider (5244); and the fifth punch rod (521) slides in the fifth slider (5244).

8. The hollow bolt 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 countersunk hole is provided on one side of the sixth main die (61) close to the sixth punch die (62); a sixth die core (611) is provided in the sixth countersunk hole; a sixth die cavity (612) is provided at the center of the sixth die core (611); a sixth punch rod (621) is passed through the sixth punch die (62); a sixth punch (622) is provided on the lower side of the sixth punch rod (621); a sixth ejection mechanism (624) is provided between the sixth punch rod (621) and the sixth punch (622); the sixth punch rod (621) and the sixth punch die (622) are slidably connected; the sixth punch (622) and the sixth punch die (62) are slidably connected; A sixth punch sleeve (623) is disposed on the outer sleeve of the sixth punch (622); the lower side of the sixth ejection mechanism (624) abuts against the sixth punch sleeve (623); the lower side of the sixth ejection mechanism (624) is connected to the sixth punch (622); the upper side of the sixth ejection mechanism (624) abuts against the sixth punch rod (621); the sixth punch rod (621) slides in the sixth die (62) to drive the sixth punch (622) to cold-forge the fifth pre-forged piece (150) in the sixth die cavity (612); the sixth punch sleeve (623) pushes the sixth ejection mechanism (624) to eject the sixth punch rod (621); and the sixth ejection mechanism (624) brings the sixth punch (622) out of the hollow hole of the finished product (160).

9. The hollow bolt cold heading die set according to claim 8, characterized in that: The sixth ejection mechanism (624) comprises a sixth ejector block (6241), a sixth ejector pin (6242), a sixth positioning block (6243), and a sixth slider (6244); the sixth punch die (62) is provided with a sixth upper cavity (625) and a sixth lower cavity (626); the sixth upper cavity (625) and the sixth lower cavity (626) form a sixth step (627); the upper end of the sixth punch sleeve (623) is arranged in the sixth lower cavity (626); the sixth punch sleeve (623) passes through the sixth punch die (62) and abuts against the upper side of the fifth pre-forging piece (150) in the sixth die cavity (612); the sixth ejector block (6241) is arranged on the upper side of the sixth step (627); the lower side of the sixth ejector block (6241) abuts against the sixth punch sleeve (623) The upper end of the sixth punch (622) is fixedly connected to the sixth ejector block (6241); a sixth positioning block (6243) is provided on the upper side of the sixth ejector block (6241); a sixth ejector pin (6242) is passed through the sixth positioning block (6243); the lower end of the sixth ejector pin (6242) passes through the sixth ejector block (6241) and abuts against the sixth punch sleeve (623); the upper end of the sixth ejector pin (6242) abuts against the sixth punch rod (621); a sixth slider (6244) is provided on the upper side of the sixth positioning block (6243); the sixth slider (6244) is a hollow structure; the sixth punch rod (621) passes into the interior of the sixth slider (6244); and the sixth punch rod (621) slides in the sixth slider (6244).

10. The hollow bolt cold heading die set according to claim 8, characterized in that: The sixth main mold (61) is provided with a waste hole (63), and the waste hole (63) is communicated with the sixth mold cavity (612).

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