Cold heading die structure of flat-end step bolt

Abstract

The utility model relates to the field of cold heading dies, in particular to a cold heading die structure of a flat-end step bolt, which comprises a first-order strong beam die, a second-order head pre-heading die, a third-order head forming die and a fourth-order forming die which are arranged in sequence, and the fourth-order forming die comprises a fourth-order punching die and a fourth-order main die. The fourth-procedure stamping die comprises a fourth-procedure stamping die shell, a stamping die cushion point, a stamping die cushion block and a trimming punch, the stamping die cushion point, the stamping die cushion block and the trimming punch are sequentially and downwards arranged in the fourth-procedure stamping die shell, a trimming punch gasket is arranged in the middle of the trimming punch and located on the lower end face of the fourth-procedure stamping die shell, and a stamping die ejector pin matched spring is arranged at the lower end of the right side of the stamping die cushion point. The punching die ejector pin and the spring sequentially downwards penetrate through the punching die cushion block and the trimming punch to the lower end face of the trimming punch gasket, the fourth-sequence main die comprises a fourth-sequence main die shell, a fourth-sequence main die piece, a fourth-sequence main die core, a fourth-sequence main die ejector pin and a fourth-sequence main die bolt, and the fourth-sequence main die piece, the fourth-sequence main die core, the fourth-sequence main die ejector pin and the fourth-sequence main die bolt are sequentially downwards arranged in the fourth-sequence main die shell; and a main die ejector sleeve wiring spring is arranged in the main die hollow cushion.

Description

Technical Field

[0001] This utility model relates to the field of cold heading dies, and specifically to a cold heading die structure for a flat-head stepped bolt. Background Technology

[0002] Multi-station cold heading is a forging method that utilizes the plasticity of metal to apply pressure or cold draw at room temperature, causing the metal to solidify and deform. On a cold heading machine, processes such as cutting, upsetting, gathering, forming, chamfering, thread rolling, diameter reduction, and edge trimming can be completed. After cold heading, bolts may require further machining, such as milling, to ensure dimensional accuracy and surface finish. This machining method can provide precise dimensions and shapes, but compared to cold heading, machining is less efficient and more expensive.

[0003] For flat-head stepped bolts, the common forming process is a combination of multi-station cold heading and machining milling. However, this combined process suffers from low forming efficiency and high cost.

[0004] Therefore, in order to overcome the shortcomings of the existing technology, it is necessary to design a simple cold heading die structure for flat-head stepped bolts. Utility Model Content

[0005] This invention provides a cold heading die structure for flat-head stepped bolts to address the problems of existing technologies.

[0006] The objective of this utility model can be achieved through the following technical solution: A cold heading die structure for a flat-head stepped bolt includes: a first-order strong-binding die, a second-order pre-heading die, a third-order head forming die, and a fourth-order forming die arranged sequentially. The fourth-order forming die includes a fourth-order punch and a fourth-order main die. The fourth-order punch includes a fourth-order punch shell, a punch pad, a punch pad block, and a trimming punch arranged sequentially downwards inside the fourth-order punch shell. A trimming punch pad is provided in the middle of the trimming punch, and the trimming punch pad is located on the lower end face of the fourth-order punch shell. A punch ejector pin with a spring is provided at the lower right end of the punch pad. The punch ejector pin with the spring passes sequentially downwards through the punch pad block and the trimming punch to the lower end face of the trimming punch pad. The four-stage main mold includes a four-stage main mold shell, a four-stage main mold bolt, a four-stage main mold ejector pin, a four-stage main mold core, and a four-stage main mold piece. The four-stage main mold piece is located on the upper inner side of the four-stage main mold shell. The four-stage main mold core is located inside the four-stage main mold shell. The four-stage main mold bolt is located at the lower end of the four-stage main mold shell. The four-stage main mold core includes a main mold hollow pad one, a main mold hollow pad two, and a main mold core hollow pad three arranged sequentially downwards. The main mold hollow pad one and the main mold hollow pad two are equipped with a main mold push tube wiring spring inside. The main mold push tube wiring spring is located at the lower end of the four-stage main mold piece. The four-stage main mold ejector pin passes sequentially upwards through the main mold core hollow pad three, the main mold push tube wiring spring, and the four-stage main mold piece.

[0007] In a further improvement, the second-stage pre-upsetting die includes a second-stage punch and a second-stage main die. The lower end of the second-stage punch is provided with a second-stage punch piece, and the interior of the second-stage punch is provided with a second-stage punch ejector pin. The second-stage punch ejector pin passes downward through the second-stage punch piece. The second-stage main die includes a second-stage main die shell, a second-stage main die bolt, a second-stage main die ejector pin, a second-stage main die core, and a second-stage main die piece. The second-stage main die piece is located inside the second-stage main die shell, the second-stage main die core is located inside the second-stage main die shell, the second-stage main die bolt is located at the lower end of the second-stage main die shell, and the second-stage main die ejector pin passes upward sequentially through the second-stage main die bolt, the second-stage main die core, and the second-stage main die piece.

[0008] In a further improvement, the three-stage head forming die includes a three-stage punch and a three-stage main die. The lower end of the three-stage punch is provided with a three-stage punch piece. The three-stage main die includes a three-stage main die shell, a three-stage main die bolt, a three-stage main die ejector pin, a three-stage main die core, and a three-stage main die piece. The three-stage main die piece is disposed inside the three-stage main die shell, the three-stage main die core is disposed inside the three-stage main die shell, the three-stage main die bolt is disposed at the lower end of the three-stage main die shell, and the three-stage main die ejector pin passes through the three-stage main die bolt, the three-stage main die core, and the three-stage main die piece in sequence upwards.

[0009] In a further improvement, the first-order strong beam die includes a first-order punch die and a first-order main die. The lower end of the first-order punch die is provided with a punch, and the first-order main die is provided with a processing channel. The punch extends into the processing channel. The first-order main die is provided with a first-order main die ejector pin, and the first-order main die ejector pin extends into the processing channel.

[0010] Compared with the prior art, the advantages of the cold heading die structure for the flat-head stepped bolt of this utility model are as follows:

[0011] The flat-head stepped bolt is formed through a four-stage process: a first-stage strong-binding die for strong binding, a second-stage pre-upsetting die for pre-upsetting, a third-stage head-forming die for head forming, and finally a fourth-stage forming die for trimming and final shaping. Due to the large diameter and thin thickness of the bolt step, the third-stage head-forming die uses a combined, split structure. Because the bolt shank is short, and considering the clamping and transfer of material through the die, the fourth-stage trimming die also needs a receiving structure to facilitate transfer during automated production. The bolt can be formed in one step during cold heading, eliminating the need for machining and milling, reducing processing steps and improving production efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a sequential strong beam mode in this utility model.

[0013] Figure 2 This is a schematic diagram of the structure of the two-stage pre-upsetting head die in this utility model.

[0014] Figure 3 This is a schematic diagram of the structure of the three-stage head forming mold in this utility model.

[0015] Figure 4 This is a schematic diagram of the structure of the four-stage forming mold in this utility model.

[0016] Figure 5 for Figure 4 Schematic diagram of the local structure in the middle

[0017] In the diagram, 1-First-order strong-binding die, 11-First-order punch die, 111-Punch one, 12-First-order main die, 121-Machining channel one, 13-First-order main die ejector pin, 2-Second-order pre-upsetting die, 21-Second-order punch die, 211-Second-order punch die piece, 212-Second-order punch die ejector pin, 22-Second-order main die, 23-Second-order main die shell, 24-Second-order main die bolt, 25-Second-order main die ejector pin, 26-Second-order main die core, 27-Second-order main die piece, 3-Third-order head forming die, 31-Third-order punch die, 311-Third-order punch die piece, 32-Third-order main die, 33-Third-order main die shell, 34-Third-order main die bolt. 35-Third-sequence main mold ejector pin, 36-Third-sequence main mold core, 37-Third-sequence main mold piece, 4-Fourth-sequence forming mold, 41-Fourth-sequence punch, 411-Fourth-sequence punch shell, 412-Punch pad, 413-Punch pad block, 414-Trimming punch, 415-Trimming punch pad, 416-Punch ejector pin with spring, 42-Fourth-sequence main mold, 43-Fourth-sequence main mold bolt, 44-Fourth-sequence main mold shell, 45-Fourth-sequence main mold ejector pin, 46-Fourth-sequence main mold core, 461-Main mold hollow pad one, 462-Main mold hollow pad two, 463-Main mold core hollow pad three, 464-Main mold push tube with wire spring, 47-Fourth-sequence main mold piece. Detailed Implementation

[0018] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The following describes the embodiments and appendices. Figures 1-5The technical solution of this utility model will be further described below.

[0021] Example 1

[0022] A cold heading die structure for a flat-head stepped bolt includes: a first-order strong-binding die 1, a second-order pre-heading die 2, a third-order head forming die 3, and a fourth-order forming die 4 arranged sequentially. The fourth-order forming die 4 includes a fourth-order punch 41 and a fourth-order main die 42. The fourth-order punch 41 includes a fourth-order punch shell 411, punch pads 412, punch pads 413, and a trimming punch 414 arranged sequentially downward inside the fourth-order punch shell 411. A trimming punch pad 415 is provided in the middle of the trimming punch 414. The trimming punch pad 415 is located on the lower end face of the fourth-order punch shell 411. A punch ejector pin with a spring 416 is provided at the lower right end of the punch pad 412. The punch ejector pin with spring 416 passes sequentially downward through the punch pad 413 and the trimming punch 414 to the lower end face of the trimming punch pad 415. The fourth-order main die 42 includes a fourth-order punch shell 411 and a fourth-order main die 42. The system comprises a main mold shell 44, a fourth-order main mold bolt 43, a fourth-order main mold ejector pin 45, a fourth-order main mold core 46, and a fourth-order main mold piece 47. The fourth-order main mold piece 47 is located on the upper inner side of the fourth-order main mold shell 44. The fourth-order main mold core 46 is located inside the fourth-order main mold shell 44. The fourth-order main mold bolt 43 is located at the lower end of the fourth-order main mold shell 44. The fourth-order main mold core 46 includes a first main mold hollow pad 461, a second main mold hollow pad 462, and a third main mold core hollow pad 463 arranged sequentially downwards. The first main mold hollow pad 461 and the second main mold hollow pad 462 are equipped with a main mold push tube wiring spring 464. The main mold push tube wiring spring 464 is located at the lower end of the fourth-order main mold piece 47. The fourth-order main mold ejector pin 45 passes sequentially upwards through the third main mold core hollow pad 463, the main mold push tube wiring spring 464, and the fourth-order main mold piece 47.

[0023] As a further preferred embodiment, the second-stage pre-upsetting die 2 includes a second-stage punch die 21 and a second-stage main die 22. The lower end of the second-stage punch die 21 is provided with a second-stage punch die piece 211. The interior of the second-stage punch die 21 is provided with a second-stage punch die ejector pin 212, which passes downward through the second-stage punch die piece 211. The second-stage main die 22 includes a second-stage main die shell 23, a second-stage main die bolt 24, a second-stage main die ejector pin 25, a second-stage main die core 26, and a second-stage main die piece 27. The second-stage main die piece 27 is disposed inside the second-stage main die shell 23. The second-stage main die core 26 is disposed inside the second-stage main die shell 23. The second-stage main die bolt 24 is disposed at the lower end of the second-stage main die shell 22. The second-stage main die ejector pin 25 passes upward sequentially through the second-stage main die bolt 24, the second-stage main die core 26, and the second-stage main die piece 27.

[0024] As a further preferred embodiment, the three-stage head forming mold 3 includes a three-stage punch 31 and a three-stage main mold 32. The three-stage punch 31 is provided with a three-stage punch piece 311 at its lower end. The three-stage main mold 32 includes a three-stage main mold shell 33, a three-stage main mold bolt 34, a three-stage main mold ejector pin 35, a three-stage main mold core 36, and a three-stage main mold piece 37. The three-stage main mold piece 37 is disposed inside the three-stage main mold shell 33. The three-stage main mold core 36 is disposed inside the three-stage main mold shell 33. The three-stage main mold bolt 34 is disposed at the lower end of the three-stage main mold shell 33. The three-stage main mold ejector pin 35 passes through the three-stage main mold bolt 34, the three-stage main mold core 36, and the three-stage main mold piece 37 sequentially upwards.

[0025] As a further preferred embodiment, the sequential strong beam die 1 includes a sequential punch die 11 and a sequential main die 12. The lower end of the sequential punch die 11 is provided with a punch 111. The sequential main die 12 is provided with a processing channel 121 inside, the punch 111 extends into the processing channel 121, and the sequential main die 12 is provided with a sequential main die ejector pin 13 inside, which extends into the processing channel 121.

[0026] like Figures 1-5 As shown, the working principle of this utility model is as follows: First, the flat-head stepped bolt is strongly bound by a first-stage strong-binding mold 1; then, the flat-head stepped bolt is pre-upset by a second-stage pre-upsetting mold 2; next, the flat-head stepped bolt is head-shaped by a third-stage head-forming mold 3; finally, the flat-head stepped bolt is trimmed and finally formed by a fourth-stage forming mold 4. Because the bolt step diameter is large and the step thickness is thin, the mold used for the third-stage head forming adopts a combined split structure. Furthermore, because the bolt shank is short, considering the factors of clamp transfer through the mold, the fourth-stage trimming mold also needs to adopt a receiving structure to facilitate transfer during automated production. The bolt can be formed in one step during cold upsetting, eliminating the need for machining and milling, reducing processing steps, and improving production efficiency.

[0027] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A cold heading die structure for a flat-head stepped bolt, characterized in that, include: The system includes a first-order strong-beam die, a second-order pre-upsetting die, a third-order head forming die, and a fourth-order forming die, arranged sequentially. The fourth-order forming die includes a fourth-order punch and a fourth-order main die. The fourth-order punch includes a fourth-order punch shell, punch pads, punch pad blocks, and a trimming punch arranged sequentially downwards inside the fourth-order punch shell. A trimming punch pad is provided in the middle of the trimming punch, and the trimming punch pad is located on the lower end face of the fourth-order punch shell. A punch ejector pin with a spring is provided at the lower right end of the punch pad. The punch ejector pin with the spring passes sequentially downwards through the punch pad block and the trimming punch to the lower end face of the trimming punch pad. The fourth-order main die includes a fourth-order main die shell and a fourth-order main die screw. The system comprises a bolt, a fourth-order main mold ejector pin, a fourth-order main mold core, and a fourth-order main mold piece. The fourth-order main mold piece is located on the upper inner side of the fourth-order main mold shell. The fourth-order main mold core is located inside the fourth-order main mold shell. The fourth-order main mold bolt is located at the lower end of the fourth-order main mold shell. The fourth-order main mold core includes a first main mold hollow pad, a second main mold hollow pad, and a third main mold core hollow pad arranged sequentially downwards. The first and second main mold hollow pads are equipped with main mold push tube wiring springs. The main mold push tube wiring springs are located at the lower end of the fourth-order main mold piece. The fourth-order main mold ejector pin passes sequentially upwards through the third main mold core hollow pad, the main mold push tube wiring springs, and the fourth-order main mold piece.

2. The cold heading die structure for a flat-head stepped bolt according to claim 1, characterized in that, The second-stage pre-upsetting die includes a second-stage punch and a second-stage main die. The lower end of the second-stage punch is provided with a second-stage punch piece. The second-stage punch is provided with a second-stage punch ejector pin inside the second-stage punch. The second-stage punch ejector pin passes downward through the second-stage punch piece. The second-stage main die includes a second-stage main die shell, a second-stage main die bolt, a second-stage main die ejector pin, a second-stage main die core, and a second-stage main die piece. The second-stage main die piece is located inside the second-stage main die shell. The second-stage main die core is located inside the second-stage main die shell. The second-stage main die bolt is located at the lower end of the second-stage main die shell. The second-stage main die ejector pin passes upward sequentially through the second-stage main die bolt, the second-stage main die core, and the second-stage main die piece.

3. The cold heading die structure for a flat-head stepped bolt according to claim 1, characterized in that, The three-stage head forming die includes a three-stage punch and a three-stage main die. The lower end of the three-stage punch is provided with a three-stage punch piece. The three-stage main die includes a three-stage main die shell, a three-stage main die bolt, a three-stage main die ejector pin, a three-stage main die core, and a three-stage main die piece. The three-stage main die piece is disposed inside the three-stage main die shell. The three-stage main die core is disposed inside the three-stage main die shell. The three-stage main die bolt is disposed at the lower end of the three-stage main die shell. The three-stage main die ejector pin passes through the three-stage main die bolt, the three-stage main die core, and the three-stage main die piece in sequence upwards.

4. The cold heading die structure for a flat-head stepped bolt according to claim 1, characterized in that, The first-order strong beam die includes a first-order punch die and a first-order main die. The lower end of the first-order punch die is provided with a punch, and the first-order main die is provided with a processing channel. The punch extends into the processing channel. The first-order main die is provided with a first-order main die ejector pin, and the first-order main die ejector pin extends into the processing channel.

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