Cold heading die set and cold heading process for automobile lock pin

Abstract

The application provides a cold heading die set and cold heading process for a car locking pin, and belongs to the technical field of fastener processing. The application comprises a first die, a second die, a third die, a fourth die and a fifth die. The first die can form a chamfer on the upper end of the locking pin blank. The second die can extrude the upper end of the locking pin blank into a tapered portion. The third die can bundle the rod diameter of the upper end of the locking pin blank. The fourth die can extrude the middle part of the locking pin blank into a flange portion. The fifth die can punch six-hole punching on the lower end surface of the locking pin blank. The first die, the second die, the third die, the fourth die and the fifth die are arranged in sequence. The application can conveniently clamp the locking pin blank with clamps, so that the movement of the locking pin blank between adjacent dies is more stable and firm, and the cold heading quality and efficiency of the locking pin blank are improved.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power equipment technology, and relates to a cold heading module and cold heading process for automotive lock stop pins. Background Technology

[0002] The structural feature of automotive fastener locking pins is that one end is a long tapered guide. They are usually manufactured using a cold heading process. Because the locking pin has a long tapered guide end, a closed (strong binding) method must be used during cold heading to meet the dimensional requirements of the process.

[0003] Currently, commonly used multi-station cold heading equipment (such as the 5-station cold heading machine manufactured by Zhengyou Machinery (Shanghai) Co., Ltd.) generally uses a closed (strong binding) process where the forming is done at the main mold end. That is, the guide end of the locking pin with a long taper is located at the main mold end, and then the blank is clamped by clamps and moved to the next mold. However, there are some problems with this process: when the ejector rod on the main mold pushes the blank out to the top of the main mold, the clamps are clamped on the lower half of the blank. Since the guide end with a long taper is located at the lower end of the blank, the clamps are prone to tilting or even falling off during the process of clamping and moving the blank, which affects the cold heading quality and processing efficiency of the locking pin. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a cold heading module and cold heading process for automotive locking pins. This allows for convenient clamping of the locking pin blanks, making their movement between adjacent molds more stable and secure, thereby improving the quality and efficiency of cold heading of the locking pin blanks.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A cold heading module for automotive locking pins, wherein the locking pin has a flange portion, a straight portion is formed on one side of the flange portion, and a tapered portion is formed on the other side. A first groove is provided on the end face of the tapered portion, and a six-petal punch is provided on the end face of the straight portion. The cold heading module includes: a first mold, which is capable of chamfering the upper end of the locking pin blank.

[0007] The second mold is capable of extruding the upper end of the locking pin blank into a conical shape;

[0008] The third mold is capable of binding the upper end of the locking pin blank with a rod diameter.

[0009] The fourth mold is capable of extruding the middle part of the locking pin blank into a flange part;

[0010] A fifth die capable of stamping a six-flower punching hole on the lower end face of the locking pin blank, and the first die, the second die, the third die, the fourth die and the fifth die are arranged in sequence.

[0011] Preferably, the first die comprises:

[0012] A first die, the lower end of the first die is provided with a first die core, and the lower end face of the first die core is provided with a first die cavity capable of forming an upper end chamfer of the locking pin blank;

[0013] A first main die, the upper end of the first main die is vertically slidably provided with a first positioning block, the upper end of the first positioning block is provided with a first main die core, the upper end face of the first main die core is provided with a first main die cavity capable of accommodating the lower end of the locking pin blank, the lower end of the first main die is provided with a first die cushion, the first die cushion and the first positioning block are provided with a first buffer spring, a first ejector rod is provided in the first die cushion, and the upper end of the first ejector rod extends into the first main die cavity through the first positioning block and the first main die core in sequence.

[0014] Preferably, the second die comprises:

[0015] A second die, the lower end of the second die is provided with a second die core, and the lower end face of the second die core is provided with a second die cavity capable of forming a taper of the upper end of the locking pin blank;

[0016] A second main die, the upper end of the second main die is vertically slidably provided with a second positioning block, the upper end of the second positioning block is provided with a second main die core, the upper end face of the second main die core is provided with a second main die cavity capable of accommodating the lower end of the locking pin blank, the lower end of the second main die is provided with a second die cushion, the second die cushion and the second positioning block are provided with a second buffer spring, a second ejector rod is provided in the second die cushion, and the upper end of the second ejector rod extends into the second main die cavity through the second positioning block and the second main die core in sequence.

[0017] Preferably, the third die comprises:

[0018] A third die, the lower end of the third die is provided with a third die core, and the lower end face of the third die core is provided with a third die cavity capable of forming a taper of the upper end of the locking pin blank;

[0019] A third main die, the upper end of the third main die is provided with a third main die core, the third main die core is provided with a third main die cavity capable of forming a taper of the lower end of the locking pin blank, and a third ejector rod is provided in the lower end of the third main die, and the upper end of the third ejector rod extends into the third main die cavity through the third main die core.

[0020] Preferably, the fourth die comprises:

[0021] The fourth die has a fourth die core at its lower end, and the lower end face of the fourth die core has a fourth die cavity that can extrude the middle part of the locking pin blank into a flange.

[0022] The fourth main mold has a fourth main mold core at its upper end. The fourth main mold core has a fourth main mold cavity with a surface that can compress the middle part of the locking pin blank into a flange. The fourth main mold has a fourth push rod at its lower end, and the upper end of the fourth push rod extends through the fourth main mold core into the fourth main mold cavity.

[0023] Preferably, the upper end of the fourth die is provided with a fourth die pad, the lower end of the fourth die pad is fixedly connected with a fourth punch, and the lower end of the fourth punch extends into the cavity of the fourth die and is provided with a first protrusion at its end.

[0024] Preferably, the fifth mold comprises:

[0025] The fifth die has a fifth die core at its lower end, and the lower end face of the fifth die core has a fifth die cavity that can fix the upper end of the locking pin blank.

[0026] The fifth main mold has a third positioning block vertically sliding on its upper end. The upper end of the third positioning block has a fifth main mold core. The upper surface of the fifth main mold core has a fifth main mold cavity that can fix the lower end of the locking pin blank. The lower end of the fifth main mold has a first pad and a second pad in sequence from top to bottom. A third buffer spring is provided between the first pad and the third positioning block. The first pad has a positioning part that extends through the fifth main mold core into the fifth main mold groove. The second pad has a fifth push rod fixed on it. The upper end of the fifth push rod extends through the first pad and the positioning part in sequence into the fifth main mold cavity.

[0027] Preferably, a material ejector rod is inserted into the second pad, and the upper end of the material ejector rod passes through the first pad and is fixedly connected to the lower end of the positioning part.

[0028] A cold heading process for a cold heading module for an automotive locking pin includes the following steps:

[0029] S1. Cut a locking pin blank of a specified length and place it in the first main mold cavity of the first main mold. Drive the first punch to move downward, contact and press down the first positioning block. The first buffer spring is compressed and deformed, and the upper end of the locking pin blank is strongly squeezed through the first punch cavity. When the first positioning block contacts the first mold pad, the upper end of the locking pin blank forms a chamfer. The first ejector pushes the chamfered locking pin blank upward.

[0030] S2. The straight part of the locking pin blank is clamped by the clamp and moved into the cavity of the second main mold. The second punch moves downward, contacts and presses down the second positioning block. The second buffer spring is compressed and deformed, and the upper end of the locking pin blank is strongly squeezed through the second punch cavity. When the second positioning block contacts the second mold pad, the upper end of the locking pin blank forms a tapered part. The second ejector pushes the tapered locking pin blank upward.

[0031] S3. The straight part of the locking pin blank is clamped by the clamp and moved into the third main mold cavity of the third main mold. The third punch moves downward and the locking pin blank is bound by the extrusion of the third punch cavity and the third main mold cavity to obtain the required size of the rod between the tapered part and the straight part. The third ejector pushes the locking pin blank after the binding rod upward.

[0032] S4. The straight part of the locking pin blank is clamped by the clamp and moved into the fourth main mold cavity of the fourth main mold. The fourth punch moves downward. Through the extrusion of the fourth punch cavity and the fourth main mold cavity, the middle part of the locking pin blank is formed into a flange. The fourth ejector pushes the flange-formed locking pin blank upward.

[0033] S5. Clamp the straight part of the locking pin blank with clamps and move it into the cavity of the fifth main mold. Drive the fifth punch to move downward, push the third positioning block to move downward, compress the third buffer spring, and punch the lower end face of the locking pin blank into a six-petal punch through the six-petal punch. Then move the ejector rod upward to push the positioning part and the formed locking pin upward. Finally, move the formed locking pin to the next process through clamps.

[0034] Preferably, the upper end of the fourth push rod is provided with a second protrusion, and the compression of the second protrusion forms a second groove on the lower end surface of the locking pin blank with the flange.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. The locking pin blank is placed in the first main mold cavity. The upper end of the blank is initially extruded into a chamfer shape through the first die cavity, which plays a shaping role and improves the stability of the second extrusion deformation. The blank is moved into the second main mold cavity by clamps, and the upper end of the blank is extruded into a tapered shape through the second die cavity. Through the two extrusions of the blank, a tapered shape is formed at the die end, which greatly improves the stability of the tapered shape. In addition, the first buffer spring makes the chamfer shaping more complete, and the second buffer spring ensures the tapered shape.

[0037] 2. Since the conical part is formed at the upper end of the blank, while the lower half of the blank is a straight part, when the blank is pushed out of the main mold, the clamps hold the straight part of the blank to ensure that the blank moves stably between several molds and will not tilt or fall off.

[0038] 3. Since the six-petal punch is located on the lower end face of the blank, when the blank moves into the fifth main mold cavity, the six-petal punch is formed in one step by the extrusion of the fifth die. While ensuring the quality of cold heading, the number of cold heading steps is reduced and the processing efficiency is improved. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the cold heading module in this invention;

[0040] Figure 2 This is a structural schematic diagram of the first mold;

[0041] Figure 3 This is a structural schematic diagram of the second mold;

[0042] Figure 4 This is a structural schematic diagram of the third mold;

[0043] Figure 5 This is a structural diagram of the fourth mold;

[0044] Figure 6 This is a structural schematic diagram of the fifth mold;

[0045] Figure 7 yes Figure 5 A magnified view of a section at point A in the middle;

[0046] Figure 8 yes Figure 5 A magnified view of a section at point B in the middle;

[0047] Figure 9 yes Figure 6 A magnified view of a section at point C;

[0048] Figure 10 This is a schematic diagram of the locking pin structure;

[0049] Figure 11 This is a schematic diagram of the machining process for the locking pin.

[0050] In the figure, 1 is the first mold; 11 is the first punch; 12 is the first punch pad; 13 is the first punch; 14 is the first punch core; 141 is the first punch cavity; 15 is the first main mold; 16 is the first positioning block; 161 is the first main mold core; 162 is the first main mold cavity; 17 is the first ejector pin; 171 is the first mold pad; 18 is the first buffer spring; 2 is the second mold; 21 is the second punch; 22 is the second punch pad; 23 is the second punch; 24 is the second... 241. Second die cavity; 25. Second main die; 26. Second positioning block; 261. Second main die core; 262. Second main die cavity; 27. Second ejector pin; 271. Second die pad; 28. Second buffer spring; 3. Third die; 31. Third die; 32. Third die pad; 33. Third punch; 34. Third die core; 341. Third die cavity; 35. Third main die; 36. Third main die core; 371. Third main die cavity; 37. Third ejector pin; 4. Fourth mold; 41. Fourth die; 42. Fourth die pad; 43. Fourth punch; 431. First protrusion; 44. Fourth die core; 441. Fourth die cavity; 45. Fourth main mold; 46. Fourth main mold core; 461. Fourth main mold cavity; 47. Fourth ejector pin; 471. Second protrusion; 5. Fifth mold; 51. Fifth die; 52. Fifth die pad; 53. Fifth punch; 54. Fifth die core; 55. 1. Fifth die cavity; 55. Fifth main die; 56. Third positioning block; 561. Fifth main die core; 562. Fifth main die cavity; 57. Fifth ejector pin; 571. First pad block; 572. Second pad block; 573. Ejector rod; 58. Third buffer spring; 59. Positioning part; 591. Six-petal punch; 6. Locking pin; 61. Flange part; 62. Straight part; 63. Six-petal punch; 64. Tapered part; 65. First groove; 651. Second groove. Detailed Implementation

[0051] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0052] like Figure 10 , 11 As shown, a cold heading module for an automotive locking pin is provided. The locking pin 6 has a flange portion 61, a straight portion 62 is formed on one side of the flange portion 61, and a tapered portion 64 is formed on the other side. A first groove 65 is provided on the end face of the tapered portion 64, and a six-petal punch 63 is provided on the end face of the straight portion 62.

[0053] like Figure 1 As shown, the cold heading module includes a first mold 1, a second mold 2, a third mold 3, a fourth mold 4, and a fifth mold 5. Each of the five molds consists of a punch and a main mold. The punch can move up and down relative to the main mold via a driver.

[0054] like Figure 2 As shown, the first mold 1 includes a first punch 11 and a first main mold 15.

[0055] The lower end of the first die 11 is provided with a first die core 14. The lower end face of the first die core 14 is provided with a first die cavity 141 that can be chamfered at the upper end of the locking pin 6 blank. The upper end of the first die 11 is provided with a first die pad 12. The lower end of the first die pad 12 is fixedly connected to a first punch 13. The lower end of the first punch 13 extends into the first die cavity 141.

[0056] The first main mold 15 has a first positioning block 16 vertically sliding on its upper end. The first positioning block 16 has a first main mold core 161 on its upper end. The upper surface of the first main mold core 161 has a first main mold cavity 162 that can accommodate the lower end of the locking pin 6 blank. The first mold pad 171 is provided at the lower end of the first main mold 15. A first buffer spring 18 is provided between the first mold pad 171 and the first positioning block 16. A first push rod 17 passes through the first mold pad 171. The upper end of the first push rod 17 passes through the first positioning block 16 and the first main mold core 161 in sequence and extends into the first main mold cavity 162.

[0057] Preferably, the first buffer spring 18 can be a spring with a load (F = L × 40%) ≥ 1000N (such as the TF40 spring from TOHATSU). With the setting of the first buffer spring 18, when the first punch 11 and the first main die 15 are closed together, the chamfer of the blank is fully formed in the closed space of the first punch cavity 141 and the first main die cavity 162, and the quality is more stable.

[0058] like Figure 3 As shown, the second mold 2 includes a second punch 21 and a second main mold 25.

[0059] The lower end of the second die 21 is provided with a second die core 24. The lower end face of the second die core 24 is provided with a second die cavity 241 that enables the upper end of the locking pin 6 blank to be tapered. The upper end of the second die 21 is provided with a second die pad 22. The lower end of the second die pad 22 is fixedly connected with a second punch 23. The lower end of the second punch 23 extends into the second die cavity 241.

[0060] The upper end of the second main mold 25 is vertically slidably provided with a second positioning block 26. The upper end of the second positioning block 26 is provided with a second main mold core 261. The upper end surface of the second main mold core 261 is provided with a second main mold cavity 262 that can accommodate the lower end of the locking pin 6 blank. The lower end of the second main mold 25 is provided with a second mold pad 271. A second buffer spring 28 is provided between the second mold pad 271 and the second positioning block 26. A second push rod 27 is passed through the second mold pad 271. The upper end of the second push rod 27 passes through the second positioning block 26 and the second main mold core 261 in sequence and extends into the second main mold cavity 262.

[0061] Preferably, the second buffer spring 28 can be a spring with a load (F = L × 40%) ≥ 1000N (such as the TF40 spring from TOHATSU). With the setting of the second buffer spring 28, when the second die 21 and the second main die 25 are closed together, the conical part 64 of the blank is fully formed in the closed space of the second die cavity 241 and the second main die cavity 262 and meets the dimensional requirements.

[0062] like Figure 4 As shown, the third mold 3 includes a third punch 31 and a third main mold 35.

[0063] The lower end of the third die 31 is provided with a third die core 34. The lower end face of the third die core 34 is provided with a third die cavity 341 that can restrain the upper end of the locking pin 6 blank. The upper end of the third die 31 is provided with a third die pad 32. The lower end of the third die pad 32 is fixedly connected to a third punch 33. The lower end of the third punch 33 extends into the third die cavity 341.

[0064] The upper end of the third main mold 35 is provided with a third main mold core 36. The third main mold core 36 is provided with a third main mold cavity 361 with a surface that can bind the lower end of the locking pin 6 blank. The lower end of the third main mold 35 is provided with a third push rod 37. The upper end of the third push rod 37 passes through the third main mold core 36 and extends into the third main mold cavity 361.

[0065] like Figure 5 , 7 As shown in Figure 8, the fourth mold 4 includes a fourth punch 41 and a fourth main mold 45.

[0066] The lower end of the fourth die 41 is provided with a fourth die core 44. The lower end face of the fourth die core 44 is provided with a fourth die cavity 441 that can extrude the middle part of the locking pin 6 blank into a flange part 61. The upper end of the fourth die 41 is provided with a fourth die pad 42. The lower end of the fourth die pad 42 is fixedly connected to a fourth punch 43. The lower end of the fourth punch 43 extends into the fourth die cavity 441 and is provided with a first protrusion 431 at its end.

[0067] The upper end of the fourth main mold 45 is provided with a fourth main mold core 46. The fourth main mold core 46 is provided with a fourth main mold cavity 461 with a surface that can compress the middle part of the locking pin 6 blank into a flange part 61. The lower end of the fourth main mold 45 is provided with a fourth push rod 47. The upper end of the fourth push rod 47 extends through the fourth main mold core 46 into the fourth main mold cavity 461 and is provided with a second protrusion 471 at its end.

[0068] like Figure 6 and 9 As shown, the fifth mold 5 includes a fifth punch 51 and a fifth main mold 55.

[0069] The lower end of the fifth die 51 is provided with a fifth die core 54. The lower end face of the fifth die core 54 is provided with a fifth die cavity 541 that can fix the upper end of the locking pin 6 blank. The upper end of the fifth die 51 is provided with a fifth die pad 52. The lower end of the fifth die pad 52 is fixedly connected to a fifth punch 53. The lower end of the fifth punch 53 extends into the fifth die cavity 541.

[0070] The upper end of the fifth main mold 55 is vertically slidably provided with a third positioning block 56. The upper end of the third positioning block 56 is provided with a fifth main mold core 561. The upper surface of the fifth main mold core 561 is provided with a fifth main mold cavity 562 that can fix the lower end of the locking pin 6 blank. The lower end of the fifth main mold 55 is provided with a first pad 571 and a second pad 572 from top to bottom. A third buffer spring 58 is provided between the first pad 571 and the third positioning block 56. The first pad 571 is provided with a positioning part 59. The positioning part 59 passes through the fifth main mold core 561 and extends into the fifth main mold groove 562. The second pad 572 is fixedly provided with a fifth push rod 57. The upper end of the fifth push rod 57 passes through the first pad 571 and extends to the upper end of the positioning part 59, and the end is provided with a six-petal punch 591. The upper end of the six-petal punch 591 extends out of the positioning part 59.

[0071] Preferably, the third buffer spring 58 can be a spring with a load (F = L × 40%) ≥ 1000N (such as the TF40 spring from TOHATSU). With the setting of the third buffer spring 58, when the fifth die 51 and the fifth main die 55 are closed together, the six-petal punch 63 on the lower end face of the blank is smoothly formed in the closed space of the fifth die cavity 541 and the fifth main die cavity 562.

[0072] In this embodiment, a ejector rod 573 is inserted into the second pad 572. The upper end of the ejector rod 573 passes through the first pad 571 and is fixedly connected to the lower end of the positioning part 59. After the locking pin 7 is extruded and formed, the third positioning block moves upward to the upper end face of the fifth main mold under the action of the third buffer spring. The ejector rod moves upward, pushing the positioning part upward, which in turn pushes the lower end of the locking pin upward out of the cavity of the fifth main mold.

[0073] The locking pin blank is placed in the first main mold cavity 162. The upper end of the blank is initially extruded into a chamfer shape by the first punch cavity 141, which serves to shape the blank and improve the stability of the second extrusion deformation. The blank is moved to the second main mold cavity 262 by clamps, and the upper end of the blank is then extruded into the tapered portion 64 by the second punch cavity 241. Through two extrusions, a taper is formed in the second punch cavity 241, which improves the stability of the taper. The blank is then moved to the third main mold cavity 361 by clamps. The blank is bound together by the third punch cavity 341 and the third main mold cavity 361 to obtain the required dimensions of the rod between the tapered portion 64 and the straight portion 62. The blank is then clamped... The blank is moved into the fourth main mold cavity 461, and the middle part of the blank is extruded into a flange part 61 by the fourth punch cavity 441 and the fourth main mold cavity 461. The first protrusion 431 at the lower end of the fourth punch 43 is used to extrude a first groove 65 on the upper end surface of the conical part 64. The second protrusion 471 at the upper end of the fourth push rod 47 is used to extrude a second groove 651 on the lower end surface of the straight part 62. The blank is moved into the fifth main mold cavity 562 by clamping, and the second groove 651 at the lower end of the straight part 62 is punched by the six-petal punch 591, realizing the one-time forming of the six-petal punch 63. While ensuring the quality of cold heading, the number of cold heading steps is reduced and the processing efficiency is improved.

[0074] The cold heading process for the aforementioned automotive lock stop pin cold heading module includes the following steps:

[0075] S1. Cut a specified length of locking pin 6 blank and place it in the first main mold cavity 162 of the first main mold 15. Drive the first punch 11 to move downward, contact and press down the first positioning block 16. The first buffer spring 18 is compressed and deformed, and the upper end of the locking pin 6 blank is strongly squeezed through the first punch cavity 141. When the first positioning block 16 contacts the first mold pad 171, the upper end of the locking pin 6 blank forms a chamfer. The first ejector rod 17 pushes the chamfered locking pin 6 blank upward.

[0076] S2. The straight part 62 of the locking pin 6 blank is clamped by the clamp and moved into the second main mold cavity 262 of the second main mold 25. The second punch 21 is driven to move downward, contact and press down the second positioning block 26. The second buffer spring 28 is compressed and deformed, and the upper end of the locking pin 6 blank is strongly squeezed through the second punch cavity 241. When the second positioning block 26 contacts the second mold pad 271, the upper end of the locking pin 6 blank forms a tapered part 64. The second ejector rod 27 pushes the tapered locking pin 6 blank upward.

[0077] S3. The straight part 62 of the locking pin 6 blank is clamped by the clamp and moved into the third main mold cavity 361 of the third main mold 35. The third punch 31 is driven to move downward. Through the extrusion of the third punch cavity 341 and the third main mold cavity 361, the rod diameter of the locking pin 6 blank is bound to obtain the required size of the rod between the tapered part 64 and the straight part 62. The third push rod 37 pushes the locking pin 6 blank after the binding rod upward.

[0078] S4. The flat part 62 of the locking pin 6 blank is clamped by the clamp and moved into the fourth main mold cavity 461 of the fourth main mold 45. The fourth punch 41 is driven to move downward. Through the extrusion of the fourth punch cavity 441 and the fourth main mold cavity 461, the middle part of the locking pin 6 blank is formed into a flange part 61. The first protrusion 431 at the lower end of the fourth punch 43 is used to press the upper end surface of the tapered part 64 to form a first groove 65. The second protrusion 471 at the upper end of the fourth push rod 47 is used to press the lower end surface of the flat part 62 to form a second groove 651. The fourth push rod 47 pushes the flange-formed locking pin 6 blank upward.

[0079] S5. The straight part 62 of the locking pin 6 blank is clamped by the clamp and moved into the fifth main mold cavity 562 of the fifth main mold 55. The fifth punch 51 is driven to move downward, pushing the third positioning block 56 to move downward, compressing the third buffer spring 58. The lower end face of the locking pin 6 blank is punched into a six-petal punch 63 by the six-petal punch 591. Then, the ejector bar 573 moves upward, pushing the positioning part 59 and the formed locking pin 6 upward. Finally, the formed locking pin 6 is moved to the next process by the clamp.

[0080] Since the tapered portion 64 is formed in the first die 11 and the second die 12, and the lower half of the blank is a straight portion 62, when the blank is pushed out of the main die, the clamps hold the straight portion 62 of the locking pin 7 blank, which can hold the blank firmly. When the locking pin 7 blank moves quickly between several dies, it will not tilt or fall off, thus improving the cold heading quality and processing efficiency of the locking pin 7 blank.

Claims

1. A cold heading process for a cold heading module for an automotive locking pin, wherein the locking pin (6) has a flange portion (61), a straight portion (62) is formed on one side of the flange portion (61), and a tapered portion (64) is formed on the other side, the tapered portion (64) is a long-tapered guide, a first groove (65) is provided on the end face of the tapered portion (64), and a six-petal punch (63) is provided on the end face of the straight portion (62), characterized in that, The cold heading module includes: a first mold (1), which is capable of chamfering the upper end of the locking pin (6) blank; The second mold (2) is capable of extruding the upper end of the locking pin (6) blank into a conical part (64). The third mold (3) is capable of binding the upper end of the locking pin (6) blank with a rod diameter; The fourth mold (4) is capable of extruding the middle part of the locking pin (6) blank into a flange (61). The fifth mold (5) is capable of punching six-petal punch holes (63) on the lower end face of the locking pin (6) blank. The first mold (1), the second mold (2), the third mold (3), the fourth mold (4) and the fifth mold (5) are arranged in sequence. The cold heading process using the above-mentioned cold heading module includes the following steps: S1. Cut a specified length of locking pin (6) blank and place it in the first mold (1). The upper end of the locking pin (6) blank is strongly squeezed through the first punch cavity (141) of the first mold (1) to form a chamfer. S2. The straight part (62) of the locking pin (6) blank is clamped by clamps and moved to the second mold (2). The upper end of the locking pin (6) blank is strongly squeezed by the second punch cavity (241) of the second mold (2). The blank is squeezed twice to form a conical part (64) at the punch end. S3. The straight part (62) of the locking pin (6) blank is clamped by clamps and moved to the third mold (3). The locking pin (6) blank is bound by the extrusion of the third die cavity (341) and the third main die cavity (361) of the third mold (3) to obtain the required size of the rod between the tapered part (64) and the straight part (62). S4. The flat part (62) of the locking pin (6) blank is clamped by clamps and moved to the fourth mold (4). The flange part (61) is formed in the middle of the locking pin (6) blank by the extrusion of the fourth die cavity (441) and the fourth main die cavity (461) of the fourth mold (4). The first protrusion (431) at the lower end of the fourth punch (43) is used to extrude the first groove (65) on the upper end surface of the tapered part (64). The second protrusion (471) at the upper end of the fourth push rod (47) is used to extrude the lower end surface of the flat part (62) to form the second groove (651). S5. Clamp the straight part (62) of the locking pin (6) blank with clamps and move it to the fifth mold (5). Use the six-petal punch (591) of the fifth mold (5) to punch out six-petal punch holes (63) on the lower end face of the locking pin (6) blank.

2. The cold heading process for a cold heading module for an automotive lock stop pin according to claim 1, characterized in that, The first mold (1) includes: The first die (11) has a first die core (14) at its lower end, and the lower end face of the first die core (14) has a first die cavity (141) that can be chamfer the upper end of the locking pin (6) blank. The first main mold (15) has a first positioning block (16) vertically sliding on its upper end. The first positioning block (16) has a first main mold core (161) on its upper end. The upper surface of the first main mold core (161) has a first main mold cavity (162) that can accommodate the lower end of the locking pin (6) blank. The lower end of the first main mold (15) has a first mold pad (171). A first buffer spring (18) is provided between the first mold pad (171) and the first positioning block (16). A first push rod (17) passes through the first mold pad (171). The upper end of the first push rod (17) passes through the first positioning block (16) and the first main mold core (161) in sequence and extends into the first main mold cavity (162).

3. The cold heading process of a cold heading module for an automotive lock stop pin according to claim 2, characterized in that, The second mold (2) includes: The second die (21) has a second die core (24) at its lower end, and the lower end face of the second die core (24) has a second die cavity (241) that can make the upper end of the locking pin (6) blank taper. The second main mold (25) has a second positioning block (26) vertically sliding on its upper end. The upper end of the second positioning block (26) has a second main mold core (261). The upper surface of the second main mold core (261) has a second main mold cavity (262) that can accommodate the lower end of the locking pin (6) blank. The lower end of the second main mold (25) has a second mold pad (271). A second buffer spring (28) is provided between the second mold pad (271) and the second positioning block (26). A second push rod (27) passes through the second mold pad (271). The upper end of the second push rod (27) passes through the second positioning block (26) and the second main mold core (261) in sequence and extends into the second main mold cavity (262).

4. The cold heading process of a cold heading module for an automotive lock stop pin according to claim 1, characterized in that, The third mold (3) includes: The third die (31) has a third die core (34) at its lower end, and the lower end face of the third die core (34) has a third die cavity (341) that can restrain the upper end of the locking pin (6) blank. The third main mold (35) has a third main mold core (36) at its upper end. The third main mold core (36) has a third main mold cavity (361) with a surface that can bind the lower end of the locking pin (6) blank. The lower end of the third main mold (35) is provided with a third push rod (37). The upper end of the third push rod (37) extends through the third main mold core (36) into the third main mold cavity (361).

5. The cold heading process for a cold heading module for an automotive lock stop pin according to claim 1, characterized in that, The fourth mold (4) includes: The fourth die (41) has a fourth die core (44) at its lower end. The lower end face of the fourth die core (44) has a fourth die cavity (441) that can extrude the middle part of the locking pin (6) blank into a flange part (61). The fourth main mold (45) has a fourth main mold core (46) at its upper end. The fourth main mold core (46) has a fourth main mold cavity (461) with a surface that can extrude the middle part of the locking pin (6) blank into a flange part (61). The fourth main mold (45) has a fourth push rod (47) at its lower end. The upper end of the fourth push rod (47) extends through the fourth main mold core (46) into the fourth main mold cavity (461).

6. The cold heading process of a cold heading module for an automotive lock stop pin according to claim 5, characterized in that, The upper end of the fourth die (41) is provided with a fourth die pad (42), and the lower end of the fourth die pad (42) is fixedly connected with a fourth punch (43). The lower end of the fourth punch (43) extends into the fourth die cavity (441) and the end is provided with a first protrusion (431).

7. The cold heading process of a cold heading module for an automotive lock stop pin according to claim 1, characterized in that, The fifth mold (5) includes: The fifth die (51) has a fifth die core (54) at its lower end, and the lower end face of the fifth die core (54) has a fifth die cavity (541) that can fix the upper end of the locking pin (6) blank. The fifth main mold (55) has a third positioning block (56) vertically sliding on its upper end. The upper end of the third positioning block (56) has a fifth main mold core (561). The upper surface of the fifth main mold core (561) has a fifth main mold cavity (562) that can fix the lower end of the locking pin (6) blank. The lower end of the fifth main mold (55) has a first pad (571) and a second pad (572) arranged sequentially from top to bottom. The first pad (571) 1) A third buffer spring (58) is provided between the first pad (571) and the third positioning block (56). A positioning part (59) is provided on the first pad (571). The positioning part (59) extends through the fifth main mold core (561) to the fifth main mold cavity (562). A fifth push rod (57) is fixed on the second pad (572). The upper end of the fifth push rod (57) extends through the first pad (571) and the positioning part (59) to the fifth main mold cavity (562).

8. The cold heading process of a cold heading module for an automotive lock stop pin according to claim 7, characterized in that, The second pad (572) is provided with a material ejector rod (573), the upper end of which passes through the first pad (571) and is fixedly connected to the lower end of the positioning part (59).

Images