Cold heading die set for flower tooth bolt

Abstract

The utility model discloses a cold heading die set of flower tooth bolt, including punch assembly and main mould assembly, punch assembly includes first punch, second punch, third punch and fourth punch, and first punch, second punch, third punch and fourth punch are equipped with first punch head, second punch head, third punch head and fourth punch head respectively, the main mould assembly includes first main mould, second main mould, third main mould and fourth main mould, and first main mould, second main mould, third main mould and fourth main mould are matched with first punch, second punch, third punch and fourth punch respectively, the utility model discloses a flower tooth groove for punching out flower tooth is set up on the fourth punch cavity inner wall, so that the die set can make the flower tooth cold heading in the last working procedure, and the subsequent flower tooth bolt does not need to carry out the post-processing flower tooth, can effectively improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of fasteners, and in particular to the technical field of cold heading die sets. Background Technology

[0002] The part of the bolt head near the bolt head has a section with a toothed pattern. During the production of the bolt, the blank is usually cold-forged first, and the blank does not have a tooth or thread. Then the tooth and thread are machined on the blank respectively.

[0003] Existing patent CN215786479U discloses a cold forging die assembly for square-head stepped bolts, which gradually cold forges the bolts using multiple dies. However, it cannot produce the tooth pattern, which needs to be processed later, resulting in low production efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a cold heading mold assembly for toothed bolts, which enables the mold assembly to directly cold head out the toothed bolts, thereby effectively improving production efficiency.

[0005] To achieve the above objectives, this utility model proposes a cold heading die assembly for a toothed bolt, comprising a die assembly and a main die assembly. The die assembly includes a first die, a second die, a third die, and a fourth die, each equipped with a first punch, a second punch, a third punch, and a fourth punch, respectively. The main die assembly includes a first main die, a second main die, a third main die, and a fourth main die, each cooperating with the first die, the second die, the third die, and the fourth die, respectively. Each of the first, second, third, and fourth main dies is equipped with a first cavity, a second cavity, a third cavity, and a fourth cavity, respectively. Each of the first, second, third, and fourth cavities is equipped with a push rod, and the inner wall of the fourth cavity is provided with a toothed groove for punching out the toothed pattern.

[0006] Preferably, the first, second, third, and fourth dies each include a die body. The die body has a first mounting groove at the end facing the main die assembly and a second mounting groove at the end facing away from the main die assembly. The second mounting groove and the first mounting groove are connected by a connecting hole. The inner diameters of both the first and second mounting grooves are larger than the inner diameter of the connecting hole. The first punch consists of a fixing ring and a limiting rod. The fixing ring is embedded in the first mounting groove, and the limiting rod passes through the second mounting groove and the connecting hole to extend into the fixing ring. Inside the ring, the fixing ring and the limiting rod together form a frustoconical groove inside the fixing ring. The second punch is composed of a second stamping block, which is embedded in the first mounting groove. The end of the first stamping block facing the main mold assembly is provided with an arc-shaped groove. The third punch is composed of a third stamping block, which is embedded in the second mounting groove. The end of the third stamping block facing the main mold assembly is a plane. The fourth punch is composed of a fourth stamping block, which is embedded in the fourth mounting groove. The end of the fourth stamping block facing the main mold assembly is located on a plane.

[0007] Preferably, the first punch cavity includes a first upper transition groove and a first main body groove connected together, and the outer radial direction of the first upper transition groove gradually decreases from the direction of the first main body groove.

[0008] Preferably, the second punching cavity includes a second upper transition groove, a second smooth rod groove, a second lower transition groove, and a second main body groove connected in sequence. The outer radial direction of the second upper transition groove gradually decreases from the direction of the second main body groove, the outer radial direction of the second lower transition groove gradually decreases from the direction of the second main body groove, and the outer radial direction of the second smooth rod groove gradually decreases from the direction of the second main body groove.

[0009] Preferably, the third punching cavity includes a third upper transition groove, a third smooth rod groove, a third lower transition groove, and a third main body groove connected in sequence. The outer radial direction of the third upper transition groove gradually decreases from the direction of the third main body groove, and the outer radial direction of the third lower transition groove gradually decreases from the direction of the third main body groove. The third smooth rod groove is cylindrical.

[0010] Preferably, the fourth punching cavity includes a fourth upper transition groove, a fourth smooth rod groove, a fourth lower transition groove, and a fourth main body groove connected in sequence. The outer radial direction of the fourth upper transition groove gradually decreases from the direction of the fourth main body groove, and the outer radial direction of the fourth lower transition groove gradually decreases from the direction of the fourth main body groove. The inner wall of the fourth smooth rod groove is provided with a toothed groove.

[0011] The beneficial effects of this utility model are as follows: By setting a tooth groove on the inner wall of the fourth punching cavity for punching out the tooth pattern, the mold assembly can cold forge out the tooth pattern in the last process. The tooth pattern bolt does not need to be further processed into a tooth pattern, which can effectively improve production efficiency.

[0012] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a front view of the cold heading die assembly for the toothed bolt of this utility model;

[0014] Figure 2 This is a schematic diagram of the first punching cavity of the cold heading die assembly for the toothed bolt of this utility model;

[0015] Figure 3 This is a schematic diagram of the second punching cavity of the cold heading die assembly for the toothed bolt of this utility model;

[0016] Figure 4 This is a schematic diagram of the third punching cavity of the cold heading die assembly for the toothed bolt of this utility model;

[0017] Figure 5 This is a schematic diagram of the fourth punching cavity of the cold heading die assembly for the toothed bolt of this utility model.

[0018] In the diagram: 10-Die body, 11-First die, 12-Second die, 13-Third die, 14-Fourth die, 15-First mounting slot, 16-Second mounting slot, 17-Connecting hole, 20-Ejector pin, 21-First main die, 22-Second main die, 23-Third main die, 24-Fourth main die, 111-Fixing ring, 112-Limiting rod, 113-Frustoconical groove, 121-Second punch, 122-Arc groove, 131-Third punch, 141 - Fourth punch, 211- First upper transition groove, 214- First main body groove, 221- Second upper transition groove, 222- Second smooth rod groove, 223- Second lower transition groove, 224- Second main body groove, 231- Third upper transition groove, 232- Third smooth rod groove, 233- Third lower transition groove, 234- Third main body groove, 240- Sprocket groove, 241- Fourth upper transition groove, 242- Fourth smooth rod groove, 243- Fourth lower transition groove, 244- Fourth main body groove. Detailed Implementation

[0019] See Figure 1The present invention relates to a cold heading die assembly for a toothed bolt, comprising a die assembly and a main die assembly. The die assembly includes a first die 11, a second die 12, a third die 13, and a fourth die 14. The first die 11, second die 12, third die 13, and fourth die 14 are respectively provided with a first punch, a second punch 121, a third punch 131, and a fourth punch 141. The main die assembly includes a first main die 21, a second main die 22, a third main die 23, and a fourth main die 24. The main mold 21, the second main mold 22, the third main mold 23 and the fourth main mold 24 cooperate with the first punch 11, the second punch 12, the third punch 13 and the fourth punch 14 respectively. The first main mold 21, the second main mold 22, the third main mold 23 and the fourth main mold 24 are respectively provided with a first punch cavity, a second punch cavity, a third punch cavity and a fourth punch cavity. The first punch cavity, the second punch cavity, the third punch cavity and the fourth punch cavity are all provided with push rods 20. The inner wall of the fourth punch cavity is provided with a tooth groove 240 for punching out the tooth pattern.

[0020] The first die 11, the second die 12, the third die 13, and the fourth die 14 each include a die body 1. The die body 1 has a first mounting groove 15 facing the main die assembly, and a second mounting groove 16 facing away from the main die assembly. The second mounting groove 16 and the first mounting groove 15 are connected by a connecting hole 17. The inner diameters of both the first mounting groove 15 and the second mounting groove 16 are larger than the inner diameter of the connecting hole 17. The first punch consists of a retaining ring 111 and a limiting rod 112. The retaining ring 111 is embedded in the first mounting groove 15, and the limiting rod 112 passes through the second mounting groove 16 and the connecting hole 17. The second punch 121 is composed of a second stamping block, which is embedded in the first mounting groove 15. The end of the first stamping block facing the main mold assembly is provided with an arc-shaped groove 122. The third punch 131 is composed of a third stamping block, which is embedded in the second mounting groove 16. The end of the third stamping block facing the main mold assembly is a plane. The fourth punch 141 is composed of a fourth stamping block, which is embedded in the fourth mounting groove. The end of the fourth stamping block facing the main mold assembly is located on a plane.

[0021] See Figure 2 The first punch cavity includes a first upper transition groove 211 and a first main body groove 214 connected together, and the outer radial direction of the first upper transition groove 211 gradually decreases in size from the direction of the first main body groove 214.

[0022] See Figure 3The second punch cavity includes a second upper transition groove 221, a second smooth rod groove 222, a second lower transition groove 223, and a second main body groove 224 connected in sequence. The outer radial direction of the second upper transition groove 221 gradually decreases in size from the direction of the second main body groove 224, the outer radial direction of the second lower transition groove 223 gradually decreases in size from the direction of the second main body groove 224, and the outer radial direction of the second smooth rod groove 222 gradually decreases in size from the direction of the second main body groove 224.

[0023] See Figure 4 The third punching cavity includes a third upper transition groove 231, a third smooth rod groove 232, a third lower transition groove 233 and a third main body groove 234 connected in sequence. The outer radial direction of the third upper transition groove 231 gradually decreases in the direction of the third main body groove 234, and the outer radial direction of the third lower transition groove 233 gradually decreases in the direction of the third main body groove 234. The third smooth rod groove 232 is cylindrical.

[0024] See Figure 5 The fourth punching cavity includes a fourth upper transition groove 241, a fourth smooth rod groove 242, a fourth lower transition groove 243, and a fourth main body groove 244 connected in sequence. The outer radial direction of the fourth upper transition groove 241 gradually decreases in size from the direction of the fourth main body groove 244, and the outer radial direction of the fourth lower transition groove 243 gradually decreases in size from the direction of the fourth main body groove 244. The inner wall of the fourth smooth rod groove 242 is provided with a perforated groove 240.

[0025] The working process of this utility model:

[0026] This utility model relates to a cold heading die assembly for producing serrated bolts. The serrated bolt consists of a bolt head, a first transition section, a serrated section, a second transition section, and a threaded section connected in sequence. The bar stock undergoes cold heading through the first die 11 and the first main die 21 to form a frustum-shaped head, a first transition section, and a smooth section. After cold heading through the second die 12 and the second main die 22, a head with an upward-protruding upper surface, a first transition section, a frustum-shaped first smooth section, a second transition section, and a second smooth section are formed. After cold heading through the third die 13 and the third main die 23, a bolt head, a first transition section, a cylindrical first smooth section, a second transition section, and a second smooth section are formed. After cold heading through the fourth die 14 and the fourth main die 24, a bolt head, a first transition section, a serrated section, a second transition section, and a smooth section are formed. The smooth section will subsequently be threaded to form a threaded section.

[0027] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A cold heading die assembly for toothed bolts, characterized in that: The system includes a die assembly and a main die assembly. The die assembly includes a first die (11), a second die (12), a third die (13), and a fourth die (14). The first die (11), the second die (12), the third die (13), and the fourth die (14) are respectively provided with a first punch, a second punch (121), a third punch (131), and a fourth punch (141). The main die assembly includes a first main die (21), a second main die (22), a third main die (23), and a fourth main die (24). The first main die (21)... The second main mold (22), the third main mold (23) and the fourth main mold (24) are respectively matched with the first punch (11), the second punch (12), the third punch (13) and the fourth punch (14). The first main mold (21), the second main mold (22), the third main mold (23) and the fourth main mold (24) are respectively provided with a first punch cavity, a second punch cavity, a third punch cavity and a fourth punch cavity. The first punch cavity, the second punch cavity, the third punch cavity and the fourth punch cavity are all provided with push rods (20). The inner wall of the fourth punch cavity is provided with a tooth groove (240) for punching out the tooth pattern.

2. The cold heading die assembly for the toothed bolt as described in claim 1, characterized in that: The first die (11), the second die (12), the third die (13), and the fourth die (14) each include a die body (1). The die body (1) has a first mounting groove (15) facing the main die assembly, and a second mounting groove (16) facing away from the main die assembly. The second mounting groove (16) and the first mounting groove (15) are connected by a connecting hole (17). The inner diameter of the first mounting groove (15) and the inner diameter of the second mounting groove (16) are both larger than the inner diameter of the connecting hole (17). The first punch consists of a fixing ring (111) and a limiting rod (112). The fixing ring (111) is embedded in the first mounting groove (15), and the limiting rod (112) passes through the second mounting groove (111). 16) and the connecting hole (17) extend into the fixing ring (111). The fixing ring (111) and the limiting rod (112) together form a frustum-shaped groove (113) inside the fixing ring (111). The second punch (121) is composed of a second stamping block. The second stamping block is embedded in the first mounting groove (15). The end of the first stamping block facing the main mold assembly is provided with an arc groove (122). The third punch (131) is composed of a third stamping block. The third stamping block is embedded in the second mounting groove (16). The end of the third stamping block facing the main mold assembly is a plane. The fourth punch (141) is composed of a fourth stamping block. The fourth stamping block is embedded in the fourth mounting groove. The end of the fourth stamping block facing the main mold assembly is located on a plane.

3. The cold heading die assembly for the toothed bolt as described in claim 1, characterized in that: The first punch cavity includes a first upper transition groove (211) and a first main body groove (214) connected together, and the outer radial direction of the first upper transition groove (211) gradually decreases in the direction of the first main body groove (214).

4. The cold heading die assembly for the toothed bolt as described in claim 1, characterized in that: The second punch cavity includes a second upper transition groove (221), a second smooth rod groove (222), a second lower transition groove (223), and a second main body groove (224) connected in sequence. The outer radial direction of the second upper transition groove (221) towards the second main body groove (224) gradually decreases, the outer radial direction of the second lower transition groove (223) towards the second main body groove (224) gradually decreases, and the outer radial direction of the second smooth rod groove (222) towards the second main body groove (224) gradually decreases.

5. The cold heading die assembly for the toothed bolt as described in claim 1, characterized in that: The third punching cavity includes a third upper transition groove (231), a third smooth rod groove (232), a third lower transition groove (233), and a third main body groove (234) connected in sequence. The outer radial direction of the third upper transition groove (231) towards the third main body groove (234) gradually decreases, and the outer radial direction of the third lower transition groove (233) towards the third main body groove (234) gradually decreases. The third smooth rod groove (232) is cylindrical.

6. The cold heading die assembly for the toothed bolt as described in claim 1, characterized in that: The fourth punching cavity includes a fourth upper transition groove (241), a fourth smooth rod groove (242), a fourth lower transition groove (243), and a fourth main body groove (244) connected in sequence. The outer radial direction of the fourth upper transition groove (241) towards the fourth main body groove (244) gradually decreases, and the outer radial direction of the fourth lower transition groove (243) towards the fourth main body groove (244) gradually decreases. The inner wall of the fourth smooth rod groove (242) is provided with a toothed groove (240).

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