Cold forming die and cold forming process for hardware lining of automobile door system

Abstract

The invention is applicable to the technical field of rivet nut manufacturing, and provides a cold forming die and a cold forming process for a hardware bushing of an automobile door system, a first station performs full-closed forward extrusion deformation on a preformed part h to form a preformed part a; the second station turns over the preformed part a, forward extrusion is carried out to stretch a large hole in the rivet pressing end to form a thin wall, and a preformed part b is formed; upsetting forming of straight teeth is completed through forward extrusion at a third station, first-time forming of a rim and a tooth-shaped part is completed, and a preformed part c is formed; the two ends of the fourth station are extruded at the same time, head outer diameters are upset, and a preformed part d is formed; the two ends of the fifth station extrude upset heads at the same time and stretch inner holes at the two ends at the same time to form a preformed part e; upset heads are extruded at the two ends of the sixth station at the same time, end face large horn mouths are upset at one time through backward extrusion when inner holes are stretched at the two ends, and a preformed part f is formed; and when an inner hole of the preformed part f is punched into the seventh station, waste in the middle of the preformed part f is squeezed out instantly, and a finished part g is formed. Therefore, the efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of rivet nut manufacturing, and particularly to a cold forming die and a cold forming process for a hardware bushing of an automobile door system. Background Art

[0002] In the cold forming of the hardware bushing set of the automobile door system, due to the special product structure, with flanges at both ends, and the flange sizes φ11 and φ14 at both ends are larger than the size φ10.5 of the middle spline part. It is very difficult to completely produce and pass through in one forming on the existing cold heading equipment. Currently, two processes of cold heading process and press riveting (pressing the bell mouth) process are adopted. The first step is to cold extrude and preform one end flange, and the second step is to press rivet and form the other end flange. This forming process has the following defects: because it is necessary to perform cold heading preforming first and then riveting, and it is produced in two processes, which requires two preparation working hours and processing working hours. The production efficiency is low and the production cost is high, and the maximum economic value cannot be achieved.

[0003] In summary, it can be seen that the existing technology is obviously inconvenient and defective in actual use, so it is necessary to be improved. Summary of the Invention

[0004] Aiming at the above defects, the purpose of the present invention is to provide a cold forming die and a cold forming process for a hardware bushing of an automobile door system, which can simultaneously complete cold heading preforming and riveting final forming during cold heading, so as to improve efficiency and reduce costs.

[0005] To achieve the above purpose, the present invention provides a cold forming die for a hardware bushing of an automobile door system, including a first station, a second station, a third station, a fourth station, a fifth station, a sixth station, and a seventh station for sequential forming of forgings;

[0006] The first station includes a first station male die and a first station female die. The first station male die includes a first male die sleeve. A first pre-punch die core penetrates through the inside of one end of the first male die sleeve. A first cushion block is provided at the other end of the first male die sleeve. The first station female die includes a first stroke die. A first post-punch rod penetrates through the inside of the first stroke die. The first stroke die and the first post-punch rod are in clearance fit and form a first die orifice. A first post sleeve is sleeved on one end of the first post-punch rod. The first station male die is fixed on the cold heading machine through the first male die sleeve, and the first station female die is fixed on the cold heading machine through the first stroke die. The preformed part h is sent to the first die orifice. The first pre-punch die core moves towards the first station female die, and the first post-punch rod moves towards the first die orifice to a predetermined position. The preformed part h is upset and deformed to form a preformed part a;

[0007] The second working station includes a second male die and a second female die. The second male die includes a second male die sleeve. Inside one end of the second male die sleeve, there is a second front punch rod passing through. At the other end of the second male die sleeve, there is a second cushion block. The second female die includes a second stroke die. Inside the second stroke die, there is a second rear punch rod passing through. The second stroke die and the second rear punch rod are in clearance fit to form a second die orifice. One end of the second rear punch rod is successively sleeved with a second rear punch rod tube, a second annular cushion block, a second three-hole seat cushion block, a second stroke die rear cushion, and a second three-hole seat ejector pin. The second male die is fixed to the cold heading machine through the second male die sleeve, and the second female die is fixed to the cold heading machine through the second stroke die. The preform a is sent to the second die orifice. The second front punch rod moves towards the second female die. The second rear punch rod moves towards the second die orifice to a predetermined position. The preform a is subjected to upsetting and extrusion deformation to form a preform b;

[0008] The third working station includes a third male die and a third female die. The third male die includes a third male die sleeve. Inside one end of the third male die sleeve, there is a third front punch rod passing through. At the other end of the third male die sleeve, there is a third cushion block. The third female die includes a third stroke die. Inside the third stroke die, there is a third rear punch rod passing through. The third stroke die and the third rear punch rod are in clearance fit to form a third die orifice. One end of the third rear punch rod is successively sleeved with a third rear punch rod tube, a third annular cushion block, a third three-hole seat cushion block, a third stroke die rear cushion, and a third three-hole seat ejector pin. The third male die is fixed to the cold heading machine through the third male die sleeve, and the third female die is fixed to the cold heading machine through the third stroke die. The preform b is sent to the third die orifice. The third front punch rod moves towards the third female die. The third rear punch rod moves towards the third die orifice to a predetermined position. The preform b is subjected to upsetting and extrusion deformation to form a preform c;

[0009] The fourth working station includes a fourth male die and a fourth female die. The fourth male die includes a fourth male die sleeve. Inside one end of the fourth male die sleeve, a fourth front punching rod penetrates through. At the other end of the fourth male die sleeve, a fourth cushion block is provided. The fourth female die includes a fourth stroke die. Inside the fourth stroke die, a fourth rear punching rod penetrates through. The fourth stroke die and the fourth rear punching rod are in clearance fit to form a fourth die orifice. One end of the fourth rear punching rod is sequentially sleeved with a fourth rear punching rod tube, a fourth annular cushion block, a fourth three-hole seat cushion block, a fourth stroke die rear cushion, and a fourth three-hole seat ejector pin. The fourth male die is fixed to the cold heading machine through the fourth male die sleeve, and the fourth female die is fixed to the cold heading machine through the fourth stroke die. The preformed part c is sent to the fourth die orifice. The fourth front punching rod moves towards the fourth female die, and the fourth rear punching rod moves towards the fourth die orifice to a predetermined position. The preformed part c undergoes upsetting extrusion deformation to form a preformed part d;

[0010] The fifth working station includes a fifth male die and a fifth female die. The fifth male die includes a fifth male die sleeve. Inside one end of the fifth male die sleeve, a fifth front punching rod penetrates through. At the other end of the fifth male die sleeve, a fifth cushion block is provided. The fifth female die includes a fifth stroke die. Inside the fifth stroke die, a fifth rear punching rod penetrates through. The fifth stroke die and the fifth rear punching rod are in clearance fit to form a fifth die orifice. One end of the fifth rear punching rod is sequentially sleeved with a fifth rear punching rod tube, a fifth annular cushion block, a fifth three-hole seat cushion block, a fifth stroke die rear cushion, and a fifth three-hole seat ejector pin. The fifth male die is fixed to the cold heading machine through the fifth male die sleeve, and the fifth female die is fixed to the cold heading machine through the fifth stroke die. The preformed part d is sent to the fifth die orifice. The fifth front punching rod moves towards the fifth female die, and the fifth rear punching rod moves towards the fifth die orifice to a predetermined position. The preformed part d undergoes upsetting extrusion deformation to form a preformed part e;

[0011] The sixth working station includes a sixth male die and a sixth female die. The sixth male die includes a sixth male die sleeve. Inside one end of the sixth male die sleeve, a sixth front punching rod penetrates through. At the other end of the sixth male die sleeve, a sixth cushion block is provided. The sixth female die includes a sixth stroke die. Inside the sixth stroke die, a sixth rear punching rod penetrates through. The sixth stroke die and the sixth rear punching rod are in clearance fit to form a sixth die orifice. One end of the sixth rear punching rod is sleeved with a sixth rear sleeve head. The sixth male die is fixed to the cold heading machine through the sixth male die sleeve, and the sixth female die is fixed to the cold heading machine through the sixth stroke die. The preformed part e is sent to the sixth die orifice. The sixth front punching rod moves towards the sixth female die, and the sixth rear punching rod moves towards the sixth die orifice to a predetermined position. The preformed part e undergoes upsetting extrusion deformation to form a preformed part f;

[0012] The seventh station includes a seventh male die and a seventh female die. The seventh male die includes a seventh male die sleeve. A punching punch rod penetrates through the inside of one end of the seventh male die sleeve. A seventh spacer block is provided at the other end of the seventh male die sleeve. The seventh female die includes a punching die core. The seventh male die is fixed to the cold heading machine through the seventh male die sleeve. The preformed part f is sent to one end of the punching die core, and the punching punch rod moves towards the punching die core to remove the web in the middle of the preformed part f to form a through hole, thereby forming the finished part g.

[0013] The cold forming die for the hardware bushing of the automobile door system according to the present invention further includes a conveying device for clamping and sequentially conveying the casting through the first station, the second station, the third station, the fourth station, the fifth station, the sixth station, and the seventh station.

[0014] For the cold forming die of the hardware bushing of the automobile door system according to the present invention, the first station male die is of an active combined structure;

[0015] The second station male die is of an active combined structure;

[0016] The third station male die is of an active combined structure;

[0017] The fourth station male die is of an active combined structure;

[0018] The fifth station male die is of an active combined structure;

[0019] The sixth station male die is of an active combined structure;

[0020] The seventh station male die is of an active combined structure.

[0021] For the cold forming die of the hardware bushing of the automobile door system according to the present invention, the first station female die is of a prestressed combined sleeve die structure;

[0022] The second station female die is of a prestressed combined sleeve die structure.

[0023] For the cold forming die of the hardware bushing of the automobile door system according to the present invention, the preformed part h is a plastic part, and the cold forming die is a rigid body.

[0024] For the cold forming die of the hardware bushing of the automobile door system according to the present invention, the temperature of the cold forming die is 20 degrees Celsius, and the friction coefficient of the cold forming die is 0.08.

[0025] For the cold forming die of the hardware bushing of the automobile door system according to the present invention, the first station is made of an interference fit of cemented carbide material and hot work die steel;

[0026] The second working station is made by the interference fit of cemented carbide material and hot work die steel;

[0027] The third working station is made by the interference fit of cemented carbide material and hot work die steel;

[0028] The fourth working station is made by the interference fit of cemented carbide material and hot work die steel;

[0029] The fifth working station is made by the interference fit of cemented carbide material and hot work die steel;

[0030] The sixth working station is made by the interference fit of cemented carbide material and hot work die steel;

[0031] The seventh working station is made by the interference fit of cemented carbide material and hot work die steel.

[0032] For the cold forming die of the hardware bushing of the automobile door system according to the present invention, the flange sizes at both ends of the finished part g are φ11 and φ14 respectively.

[0033] For the cold forming die of the hardware bushing of the automobile door system according to the present invention, the size of the middle spline teeth of the finished part g is φ10.5.

[0034] A cold forming process for the hardware bushing of an automobile door system includes the following steps:

[0035] S0. Cutting the material, intercepting the rivet nut as the preformed part h;

[0036] S1. Using the first working station to perform fully enclosed forward extrusion deformation on the preformed part h to eliminate tearing and form the preformed part a;

[0037] S2. Using the second working station to turn over the preformed part a and perform forward extrusion to stretch the large hole at the press riveting end to form a thin wall, forming the preformed part b;

[0038] S3. Using the third working station to perform forward extrusion on the preformed part b to complete the upset forming of the straight teeth, completing the first forming of the flange and the tooth shape part, forming the preformed part c;

[0039] S4. Using the fourth working station to simultaneously extrude and upset the outer diameter at both ends of the preformed part c to complete the final forming of the flange and the second forming of the tooth shape part, forming the preformed part d;

[0040] S5. Using the fifth working station to simultaneously extrude and upset both ends of the preformed part d and simultaneously stretch the inner hole at both ends to form the preformed part e;

[0041] S6. Using the sixth working station to simultaneously extrude and upset both ends of the preformed part e, and perform reverse extrusion to upset the end face large flared opening at one time when stretching the inner hole at both ends to complete the final forming of the flange size, forming the preformed part f;

[0042] S7. When punching into the inner hole of the preform f at the seventh station, the waste in the middle of the preform f is instantaneously squeezed out. After completion, the preform f and the waste are transported through different channels to form the finished part g.

[0043] In the present invention, the preform h is subjected to fully enclosed forward extrusion deformation at the first station to eliminate tearing and form the preform a; the preform a is flipped at the second station, and the large hole at the riveting end is stretched by forward extrusion to form a thin wall, forming the preform b; the preform b is subjected to forward extrusion at the third station to complete the upsetting forming of the straight teeth, completing the first forming of the rim and the tooth profile part, forming the preform c; the two ends of the preform c are simultaneously extruded and upset at the fourth station to complete the final forming of the rim and the second forming of the tooth profile part, forming the preform d; the two ends of the preform d are simultaneously extruded and upset and the inner hole is stretched at both ends at the fifth station to form the preform e; the two ends of the preform e are simultaneously extruded and upset at the sixth station, and the large trumpet-shaped end face is upset by reverse extrusion at the same time when the inner hole is stretched at both ends, completing the final forming of the rim size, forming the preform f; when punching into the inner hole of the preform f at the seventh station, the waste in the middle of the preform f is instantaneously squeezed out. After completion, the preform f and the waste are transported through different channels to form the finished part g. Thus, the cold forming die and the cold forming process of the hardware bushing for the automotive door system of the present invention complete cold heading preforming and riveting final forming simultaneously during the cold heading process, achieving improved efficiency and reduced costs. Description of the Drawings

[0044] Figure 1 It is a schematic structural view of the preform h of the hardware bushing for the automotive door system of the present invention;

[0045] Figure 2 It is a schematic view of the sequential forming of the hardware bushing of the automotive door system of the present invention;

[0046] Figure 3 It is a schematic structural view of the first station in the hardware bushing for the automotive door system of the present invention;

[0047] Figure 4 It is a schematic structural view of the second station in the hardware bushing for the automotive door system of the present invention;

[0048] Figure 5 It is a schematic structural view of the third station in the hardware bushing for the automotive door system of the present invention;

[0049] Figure 6 It is a schematic structural view of the fourth station in the hardware bushing for the automotive door system of the present invention;

[0050] Figure 7 It is a schematic structural view of the fifth station in the hardware bushing for the automotive door system of the present invention;

[0051] Figure 8 It is a schematic structural diagram of the sixth station in the hardware bushing of the vehicle door system of the present invention;

[0052] Figure 9 It is a schematic structural diagram of the seventh station in the hardware bushing of the vehicle door system of the present invention;

[0053] Figure 10 It is the metal streamline diagram of the first station in the hardware bushing of the vehicle door system of the present invention;

[0054] Figure 11 It is the metal streamline diagram of the second station in the hardware bushing of the vehicle door system of the present invention;

[0055] Figure 12 It is the metal streamline diagram of the third station in the hardware bushing of the vehicle door system of the present invention;

[0056] Figure 13 It is the metal streamline diagram of the fourth station in the hardware bushing of the vehicle door system of the present invention;

[0057] Figure 14 It is the metal streamline diagram of the fifth station in the hardware bushing of the vehicle door system of the present invention;

[0058] Figure 15 It is the metal streamline diagram of the sixth station in the hardware bushing of the vehicle door system of the present invention;

[0059] Figure 16 It is the load distribution diagram of the first station in the hardware bushing of the vehicle door system of the present invention;

[0060] Figure 17 It is the load distribution diagram of the second station in the hardware bushing of the vehicle door system of the present invention;

[0061] Figure 18 It is the load distribution diagram of the third station in the hardware bushing of the vehicle door system of the present invention;

[0062] Figure 19 It is the load distribution diagram of the fourth station in the hardware bushing of the vehicle door system of the present invention;

[0063] Figure 20 It is the load distribution diagram of the fifth station in the hardware bushing of the vehicle door system of the present invention;

[0064] Figure 21 It is the load distribution diagram of the sixth station in the hardware bushing of the vehicle door system of the present invention;

[0065] Figure 22 It is the equivalent stress diagram of the first station in the hardware bushing of the vehicle door system of the present invention;

[0066] Figure 23 It is the equivalent stress diagram of the second working station in the hardware bushing of the vehicle door system of the present invention;

[0067] Figure 24 It is the equivalent stress diagram of the third working station in the hardware bushing of the vehicle door system of the present invention;

[0068] Figure 25 It is the equivalent stress diagram of the fourth working station in the hardware bushing of the vehicle door system of the present invention;

[0069] Figure 26 It is the equivalent stress diagram of the fifth working station in the hardware bushing of the vehicle door system of the present invention;

[0070] Figure 27 It is the equivalent stress diagram of the sixth working station in the hardware bushing of the vehicle door system of the present invention. Specific embodiments

[0071] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0072] Please refer to Figure 1 and Figure 2, the present invention provides a technical solution: the rim sizes at both ends of the hardware bushing of the car door system are φ11 and φ14 respectively, and the size of the middle spline part is φ10.5. A cold forming die for the hardware bushing of the car door system includes a first station, a second station, a third station, a fourth station, a fifth station, a sixth station, and a seventh station for the sequential forming of forgings; the preformed part h of the rivet nut is subjected to fully enclosed forward extrusion deformation in the first station to eliminate tearing and form the preformed part a; the preformed part a is transferred to the second station by a transfer device, and the preformed part a is flipped in the second station. The second station forward extrudes the preformed part a and stretches the large hole at the press riveting end to form a thin wall, forming the preformed part b; the preformed part b is transferred to the third station by a transfer device, and the preformed part b is forward extruded in the third station to complete the upset forming of the straight teeth, completing the first forming of the rim and the tooth profile part, forming the preformed part c; the preformed part c is transferred to the fourth station by a transfer device, and both ends of the preformed part c are simultaneously extruded and upset the outer diameter in the fourth station to complete the final forming of the rim and the second forming of the tooth profile part, forming the preformed part d; the preformed part d is transferred to the fifth station by a transfer device, and both ends of the preformed part d are simultaneously extruded and upset and the inner hole is stretched at both ends, forming the preformed part e; the preformed part e is transferred to the sixth station by a transfer device, and both ends of the preformed part e are simultaneously extruded and upset in the sixth station. When stretching the inner hole at both ends, a large flared end face is upset in a reverse extrusion at one time to complete the final forming of the rim size, forming the preformed part f; the preformed part f is transferred to the seventh station by a transfer device, and in the seventh station, the inner hole of the preformed part f is punched and the waste in the middle of the preformed part f is instantly squeezed out. After completion, the preformed part f and the waste are transmitted through different channels to form the finished part g. In addition, the transfer of the preformed parts between the first station, the second station, the third station, the fourth station, the fifth station, the sixth station, and the seventh station can be manually clamped or transmitted through a transmission device. Therefore, the transmission device further includes a transfer device that sequentially clamps and passes through the first station, the second station, the third station, the fourth station, the fifth station, the sixth station, and the seventh station for clamping the casting. The transfer device can be any one of the existing technologies as long as it can achieve the clamping and transmission function. Therefore, it is not shown in the figure and in this technical solution.

[0073] Please refer to Figure 3, intercept the rivet nut as the preform h, and use the first station 1 to perform fully enclosed forward extrusion deformation on the preform h to eliminate tearing and form the preform a. The first station 1 includes a first station male die and a first station female die. The first station male die includes a first male die sleeve 11. Inside one end of the first male die sleeve 11, a first pre-punching die core 12 is penetrated. The first male die sleeve 11 and the first pre-punching die core 12 are in clearance fit. At the other end of the first male die sleeve 11, a first cushion block 13 is provided. The first station female die includes a first stroke die 14. Inside the first stroke die 14, a first post-punching rod 15 is penetrated. The first stroke die 14 and the first post-punching rod 15 are in clearance fit and form a first die orifice. A first post sleeve 16 is sleeved on one end of the first post-punching rod 15. The first station male die is fixed to the cold heading machine through the first male die sleeve 11, and the first station female die is fixed to the cold heading machine through the first stroke die 14. The first station female die is locked with the first stroke die 14 through a lock nut and then fixed to the cold heading machine together with the first stroke die 14. During deformation, the conveying device sends the preform h to the first die orifice. The main slider of the cold heading machine drives the first pre-punching die core 12 of the first station male die on the left side to move towards the first station female die. Under the action of the first pre-punching die core 12, the preform h is pushed into the first die orifice on the right side. Both ends of the preform h are fixed on the same central axis of the first station male die and the first station female die. The main slider of the cold heading machine drives the first pre-punching die core 12 to continue moving towards the first station female die. When the first pre-punching die core 12 moves forward to the frontmost point driven by the main slider, the first post-punching rod 15 moves towards the first die orifice to a predetermined position, and the preform h is subjected to upsetting extrusion deformation to form the preform a;

[0074] Please refer to Figure 4, the preform a is flipped by the second station 2, and the large hole at the riveting end is stretched by forward extrusion to form a thin wall, forming the preform b; the second station 2 includes a second station male die and a second station female die. The second station male die includes a second male die sleeve 21. A second front punch 22 is disposed through the inside of one end of the second male die sleeve 21. The second front punch 22 is in clearance fit with the second male die sleeve 21. A second spacer 23 is disposed at the other end of the second male die sleeve 21. The second station female die includes a second stroke die 24. A second back punch 25 is disposed through the inside of the second stroke die 24. The second stroke die 24 is in clearance fit with the second back punch 25 to form a second die orifice. One end of the second back punch 25 is sequentially sleeved with a second back punch tube 26, a second annular spacer 27, a second three-hole seat spacer 28, a second stroke die back pad 29, and a second three-hole seat ejector pin 210. The second station male die is fixed to the cold heading machine through the second male die sleeve 21. The second station female die is fixed to the cold heading machine through the second stroke die 24. The second station female die is locked with the second stroke die 24 by a locking nut and then fixed to the cold heading machine together with the second stroke die 24. During deformation, the transfer device sends the preform a to the second die orifice. The main slider of the cold heading machine drives the second front punch 22 of the second station male die on the left side to move towards the second station female die. Under the action of the second front punch 22, the preform a is pushed into the second die orifice on the right side. Both ends of the preform a are fixed on the same central axis of the second station male die and the second station female die. The main slider of the cold heading machine drives the second front punch 22 to continue moving towards the second station female die. When the second front punch 22 moves forward to the foremost point driven by the main slider, the second back punch 25 moves towards the second die orifice to a predetermined position, and the preform a is deformed by upsetting extrusion to form the preform b;

[0075] Please refer to Figure 5, the third station 3 is used to perform forward extrusion on the preform b to complete the upset forming of straight teeth, completing the first forming of the rim and tooth profile parts to form the preform c; the third station 3 includes a third station male die and a third station female die. The third station male die includes a third male die sleeve 31. Inside one end of the third male die sleeve 31, a third front punch rod 32 is penetrated. The third front punch rod 32 is in clearance fit with the third male die sleeve 31. At the other end of the third male die sleeve 31, a third spacer block 33 is provided. The third station female die includes a third stroke die 34. Inside the third stroke die 34, a third rear punch rod 35 is penetrated. The third stroke die 34 is in clearance fit with the third rear punch rod 35 to form a third die orifice. One end of the third rear punch rod 35 is successively sleeved with a third rear punch rod tube 36, a third annular spacer block 37, a third three-hole seat spacer block 38, a third stroke die rear pad 39, and a third three-hole seat ejector pin 310. The third station male die is fixed to the cold heading machine through the third male die sleeve 31, and the third station female die is fixed to the cold heading machine through the third stroke die 34. The third station female die is locked with the third stroke die 34 through a locking nut and then fixed to the cold heading machine with the third stroke die 34. During deformation, the conveying device sends the preform b to the third die orifice. The main slider of the cold heading machine drives the third front punch rod 32 of the third station male die on the left side to move towards the third station female die. Under the action of the third front punch rod 32, the preform b is pushed into the third die orifice on the right side. Both ends of the preform b are fixed on the same central axis of the third station male die and the third station female die. The main slider of the cold heading machine drives the third front punch rod 32 to continue moving towards the third station female die. When the third front punch rod 32 moves forward to the frontmost point driven by the main slider, the third rear punch rod 35 moves towards the third die orifice to a predetermined position, and the preform b is upset and deformed to form the preform c;

[0076] Please refer to Figure 6, the fourth station 4 is used to simultaneously extrude and upset the outer diameters of both ends of the preform c to complete the final forming of the wheel rim and the second forming of the tooth profile part, forming the preform d; the fourth station 4 includes a fourth station male die and a fourth station female die. The fourth station male die includes a fourth male die sleeve 41. Inside one end of the fourth male die sleeve 41, a fourth front punch 42 is penetrated. The fourth front punch 42 is in clearance fit with the fourth male die sleeve 41. At the other end of the fourth male die sleeve 41, a fourth spacer 43 is provided. The fourth station female die includes a fourth stroke die 44. Inside the fourth stroke die 44, a fourth rear punch 45 is penetrated. The fourth stroke die 44 is in clearance fit with the fourth rear punch 45 to form a fourth die orifice. One end of the fourth rear punch 45 is sequentially sleeved with a fourth rear punch tube 46, a fourth annular spacer 47, a fourth three-hole seat spacer 48, a fourth stroke die rear pad 49, and a fourth three-hole seat ejector pin 410. The fourth station male die is fixed to the cold heading machine through the fourth male die sleeve 41. The fourth station female die is fixed to the cold heading machine through the fourth stroke die 44. The fourth station female die is locked with the fourth stroke die 44 through a locking nut and then fixed to the cold heading machine together with the fourth stroke die 44. During deformation, the conveying device sends the preform c to the fourth die orifice. The main slider of the cold heading machine drives the fourth front punch 42 of the fourth station male die on the left side to move towards the fourth station female die. Under the action of the fourth front punch 42, the preform c is pushed into the fourth die orifice on the right side. Both ends of the preform c are fixed on the same central axis of the fourth station male die and the fourth station female die. The main slider of the cold heading machine drives the fourth front punch 42 to continue moving towards the fourth station female die. When the fourth front punch 42 moves forward to the frontmost point driven by the main slider, the fourth rear punch 45 moves towards the fourth die orifice to a predetermined position, and the preform c is deformed by upsetting and extrusion to form the preform d;

[0077] Please refer to Figure 7, the two ends of the preform d are simultaneously extruded and upset and the inner holes at both ends are simultaneously stretched by using the fifth station 5 to form a preform e; the fifth station 5 includes a fifth station male die and a fifth station female die. The fifth station male die includes a fifth male die sleeve 51. A fifth front punch 52 is arranged through the inside of one end of the fifth male die sleeve 51. The fifth front punch 52 is in clearance fit with the fifth male die sleeve 51. A fifth spacer 53 is arranged at the other end of the fifth male die sleeve 51. The fifth station female die includes a fifth stroke die 54. A fifth back punch 55 is arranged through the inside of the fifth stroke die 54. The fifth stroke die 54 is in clearance fit with the fifth back punch 55 to form a fifth die orifice. One end of the fifth back punch 55 is sequentially sleeved with a fifth back punch tube 56, a fifth annular spacer 57, a fifth three-hole seat spacer 58, a fifth stroke die back pad 59 and a fifth three-hole seat ejector pin 510. The fifth station male die is fixed on the cold heading machine through the fifth male die sleeve 51. The fifth station female die is fixed on the cold heading machine through the fifth stroke die 54. The fifth station female die is locked with the fifth stroke die 54 through a lock nut and then fixed on the cold heading machine together with the fifth stroke die 54. During deformation, the conveying device sends the preform d to the fifth die orifice. The main slider of the cold heading machine drives the fifth front punch 52 of the fifth station male die on the left side to move towards the fifth station female die. Under the action of the fifth front punch 52, the preform d is pushed into the fifth die orifice on the right side. The two ends of the preform d are fixed on the same central axis of the fifth station male die and the fifth station female die. The main slider of the cold heading machine drives the fifth front punch 52 to continue moving towards the fifth station female die. When the fifth front punch 52 moves forward to the frontmost point driven by the main slider, the fifth back punch 55 moves towards the fifth die orifice to a predetermined position. The preform d is subjected to upset extrusion deformation to form a preform e;

[0078] Please refer to Figure 8, the two ends of the preform e are simultaneously extruded and upset using the sixth station 6. When stretching the inner holes at both ends, a large flared end face is upset in one step by reverse extrusion to complete the final forming of the rim size and form the preform f. The sixth station 6 includes a sixth station male die and a sixth station female die. The sixth station male die includes a sixth male die sleeve 61. Inside one end of the sixth male die sleeve 61, a sixth front punch 62 is penetrated. The sixth front punch 62 is in clearance fit with the sixth male die sleeve 61. At the other end of the sixth male die sleeve 61, a sixth spacer 63 is provided. The sixth station female die includes a sixth stroke die 64. Inside the sixth stroke die 64, a sixth back punch 65 is penetrated. The sixth stroke die 64 is in clearance fit with the sixth back punch 65 to form a sixth die orifice. A sixth back sleeve 66 is sleeved on one end of the sixth back punch 65. The sixth station male die is fixed to the cold heading machine through the sixth male die sleeve 61, and the sixth station female die is fixed to the cold heading machine through the sixth stroke die 64. The sixth station female die is locked with the sixth stroke die 64 through a lock nut and then fixed to the cold heading machine together with the sixth stroke die 64. During deformation, the transfer device sends the preform e to the sixth die orifice. The main slider of the cold heading machine drives the sixth front punch 62 of the sixth station male die on the left side to move towards the sixth station female die. Under the action of the sixth front punch 62, the preform e is pushed into the sixth die orifice on the right side. The two ends of the preform e are fixed on the same central axis of the sixth station male die and the sixth station female die. The main slider of the cold heading machine drives the sixth front punch 62 to continue moving towards the sixth station female die. When the sixth front punch 62 moves forward to the frontmost point driven by the main slider, the sixth back punch 65 moves towards the sixth die orifice to a predetermined position, and the preform e is upset and deformed to form the preform f;

[0079] Please refer to Figure 9, when the seventh station 7 punches into the inner hole of the preform f, the waste in the middle of the preform f is instantly squeezed out. After completion, the preform f and the waste 75 are transported through different channels to form the finished part g. The seventh station 7 includes a seventh station male die and a seventh station female die. The seventh station male die includes a seventh male die sleeve 71. Inside one end of the seventh male die sleeve 71, a punching punch 72 is penetrated. The punching punch 72 is in clearance fit with the seventh male die sleeve 71. At the other end of the seventh male die sleeve 71, a seventh spacer 73 is provided. The seventh station female die includes a punching die core 74. The seventh station male die is fixed to the cold heading machine through the seventh male die sleeve 71. During deformation, the transfer device sends the preform f to one end of the punching die core 74. Under the action of the punching punch 72, the preform f is pushed into the punching die core 74 on the right. The two ends of the preform f are fixed on the same central axis of the seventh station male die and the seventh station female die. The main slider of the cold heading machine drives the punching punch 72 of the seventh station male die on the left to move towards the punching die core 74 to remove the skin in the middle of the preform f to form a through hole. When the punching punch 72 moves forward to the frontmost point driven by the main slider, the punching die core 74 moves towards the seventh station male die to a predetermined position, and the preform f and the waste 75 are transported through different channels to form the finished part g.

[0080] Preferably, it further includes a transfer device for clamping and sequentially clamping the casting through the first station, the second station, the third station, the fourth station, the fifth station, the sixth station, and the seventh station. The transfer device can be any one of the existing technologies as long as it can achieve the function of clamping and transferring. Therefore, it is not shown in the figure or in this technical solution.

[0081] Preferably, the first station male die is an active combined structure; the second station male die is an active combined structure; the third station male die is an active combined structure; the fourth station male die is an active combined structure; the fifth station male die is an active combined structure; the sixth station male die is an active combined structure; the seventh station male die is an active combined structure. The first station, the second station, the third station, the fourth station, the fifth station, the sixth station, and the seventh station are respectively formed by interference fit of cemented carbide material G50 and hot work die steel H13 / SKH-55.

[0082] Preferably, the first station female die is a prestressed combined sleeve die structure; the second station female die is a prestressed combined sleeve die structure.

[0083] Preferably, the preform h is a plastic part, and the cold forming die is a rigid body.

[0084] Preferably, the temperature of the cold forming die is 20 degrees Celsius, and the friction coefficient of the cold forming die is 0.08.

[0085] Preferably, the first working station is made by the interference fit of cemented carbide material and hot work die steel; the second working station is made by the interference fit of cemented carbide material and hot work die steel; the third working station is made by the interference fit of cemented carbide material and hot work die steel; the fourth working station is made by the interference fit of cemented carbide material and hot work die steel; the fifth working station is made by the interference fit of cemented carbide material and hot work die steel; the sixth working station is made by the interference fit of cemented carbide material and hot work die steel; the seventh working station is made by the interference fit of cemented carbide material and hot work die steel. The cemented carbide material is G50, and the hot work die steel is H13 / SKH-55.

[0086] Preferably, the rim sizes at both ends of the finished part g are φ11 and φ14 respectively.

[0087] Preferably, the size of the middle spline teeth of the finished part g is φ10.5.

[0088] With the help of SD software, the present invention sequentially completes the modeling and assembly of the first working station, the second working station, the third working station, the fourth working station, the fifth working station, the sixth working station and the seventh working station. The simulation result of the first working station is used as the initial condition of the second working station, and the simulation result of the second working station is used as the initial condition of the third working station, and so on, and then imported into Deform-3D for numerical calculation. The preformed part h is defined as a plastic body and the die as a rigid body, elastic deformation is not considered, the cold heading temperature is 20 °C, the friction type is selected as Shear, and the friction coefficient is 0.08. By establishing the Johnson-Cook model, the stress and strain conditions of each working station are analyzed. Refer to Figures 10 - 15 From the metal flow line diagrams of each working station, it can be seen that the deformation amount distribution of the parts at each working station is reasonable, the part flow lines are continuous and uniform after forming, and there is no metal flow confluence phenomenon inside, so it can be judged that the part flow is smooth and there is no folding defect found. Refer to Figures 22 - 27 From the equivalent stress diagrams of each working station, the equivalent stress at each working station is in the range of 700 ± 20 MPa, indicating that the deformation of the parts at each working station is relatively balanced, the product is stressed evenly, which is beneficial to forming; Refer to Figures 16 - 21 From the load distribution diagrams of each working station, the overall change trends are roughly the same, the differences in the loads of each working station are not large, the forces on the dies of each working station are relatively balanced, and the die lives are close, which is beneficial to the overall replacement of the cold heading dies.

[0089] In summary, in the present invention, the preform h is subjected to fully enclosed forward extrusion deformation at the first station to eliminate tearing and form the preform a; the preform a is flipped at the second station, and the large hole at the riveting end is stretched by forward extrusion to form a thin wall, forming the preform b; the preform b is subjected to forward extrusion at the third station to complete the upsetting forming of the straight teeth, completing the first forming of the rim and the tooth profile part, forming the preform c; the two ends of the preform c are simultaneously extruded and the outer diameter is upset at the fourth station, completing the final forming of the rim and the second forming of the tooth profile part, forming the preform d; the two ends of the preform d are simultaneously extruded and upset and the inner holes at both ends are stretched at the fifth station, forming the preform e; the two ends of the preform e are simultaneously extruded and upset at the sixth station, and a large end-face bell mouth is upset in one step by backward extrusion when the inner holes at both ends are stretched, completing the final forming of the rim size, forming the preform f; at the seventh station, the waste in the middle of the preform f is instantaneously squeezed out when the inner hole of the preform f is punched, and after completion, the preform f and the waste are transmitted through different channels, forming the finished product g. Thus, the cold forming die and the cold forming process of the hardware bushing for the automobile door system of the present invention complete cold heading preforming and riveting final forming simultaneously during the cold heading process, achieving improved efficiency and reduced costs.

[0090] Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A cold forming die for a metal bushing of a car door system, characterized in that: It includes a first station, a second station, a third station, a fourth station, a fifth station, a sixth station and a seventh station for sequentially forming forgings; The first station comprises a first station male die and a first station female die, the first station male die comprises a first male die sleeve, a first pre-punching die core is penetrated inside one end of the first male die sleeve, a first cushion block is provided at the other end of the first male die sleeve, the first station female die comprises a first stroke die, a first back punch is penetrated inside the first stroke die, the first stroke die and the first back punch are clearance-matched to form a first die opening, a first back sleeve head is sleeved on one end of the first back punch, the first station male die is fixed on the cold heading machine through the first male die sleeve, the first station female die is fixed on the cold heading machine through the first stroke die, the preform h is delivered to the first die opening, the first pre-punching die core moves toward the first station female die, the first back punch moves to a predetermined position toward the first die opening, and the preform h is deformed by upsetting to form a preform a; The second station comprises a second station male die and a second station female die, the second station male die comprises a second male die sleeve, a second front punch is penetrated inside one end of the second male die sleeve, a second cushion block is provided at the other end of the second male die sleeve, the second station female die comprises a second stroke die, a second rear punch is penetrated inside the second stroke die, the second stroke die and the second rear punch are clearance-matched to form a second die opening, a second rear punch tube, a second annular cushion block, a second three-hole seat cushion block, a second stroke die rear cushion and a second three-hole seat ejector are sequentially sleeved on one end of the second rear punch, the second station male die is fixed on the cold heading machine through the second male die sleeve, the second station female die is fixed on the cold heading machine through the second stroke die, the preform a is delivered to the second die opening, the second front punch moves toward the second station female die, the second rear punch moves to a predetermined position in the direction of the second die opening, and the preform a is deformed by upsetting to form a preform b; The third station includes a third station male mold and a third station female mold, the third station male mold includes a third male mold sleeve, one end of the third male mold sleeve is provided with a third front punch rod, the other end of the third male mold sleeve is provided with a third cushion block, the third station female mold includes a third stroke mold, the third stroke mold is provided with a third rear punch rod, the third stroke mold and the third rear punch rod are clearance-matched to form a third die opening, one end of the third rear punch rod is sequentially sleeved with a third rear punch rod tube, a third annular cushion block, a third three-hole seat cushion block, a third stroke mold rear pad and a third three-hole seat ejector pin, the third station male mold is fixed on the cold heading machine through the third male mold sleeve, the third station female mold is fixed on the cold heading machine through the third stroke mold, the preform b is sent to the third die opening, the third front punch rod moves toward the third station female mold, the third rear punch rod moves to a predetermined position in the direction of the third die opening, and the preform b is deformed by upsetting to form a preform c; The fourth station includes a fourth station male die and a fourth station female die, the fourth station male die includes a fourth male die sleeve, one end of the fourth male die sleeve is provided with a fourth front punch rod, the other end of the fourth male die sleeve is provided with a fourth cushion block, the fourth station female die includes a fourth stroke die, the fourth stroke die is provided with a fourth rear punch rod, the fourth stroke die and the fourth rear punch rod are clearance-matched to form a fourth die opening, one end of the fourth rear punch rod is sequentially sleeved with a fourth rear punch rod tube, a fourth annular cushion block, a fourth three-hole seat cushion block, a fourth stroke die rear cushion and a fourth three-hole seat ejector pin, the fourth station male die is fixed on the cold heading machine through the fourth male die sleeve, the fourth station female die is fixed on the cold heading machine through the fourth stroke die, the preform c is delivered to the fourth die opening, the fourth front punch rod moves toward the fourth station female die, the fourth rear punch rod moves to a predetermined position in the direction of the fourth die opening, and the preform c is deformed by upsetting to form a preform d; The fifth station includes a fifth station male die and a fifth station female die, the fifth station male die includes a fifth male die sleeve, one end of the fifth male die sleeve is provided with a fifth front punch, the other end of the fifth male die sleeve is provided with a fifth cushion block, the fifth station female die includes a fifth stroke die, the fifth stroke die is provided with a fifth rear punch, the fifth stroke die and the fifth rear punch are clearance-matched to form a fifth die opening, one end of the fifth rear punch is sequentially sleeved with a fifth rear punch tube, a fifth annular cushion block, a fifth three-hole seat cushion block, a fifth stroke die rear pad and a fifth three-hole seat ejector pin, the fifth station male die is fixed on the cold heading machine through the fifth male die sleeve, the fifth station female die is fixed on the cold heading machine through the fifth stroke die, the preform d is delivered to the fifth die opening, the fifth front punch moves toward the fifth station female die, the fifth rear punch moves toward the fifth die opening to a predetermined position, and the preform d is deformed by upsetting to form a preform e; The sixth station includes a sixth station male die and a sixth station female die, the sixth station male die includes a sixth male die sleeve, one end of the sixth male die sleeve is provided with a sixth front punch rod, the other end of the sixth male die sleeve is provided with a sixth cushion block, the sixth station female die includes a sixth stroke die, the sixth stroke die is provided with a sixth rear punch rod, the sixth stroke die and the sixth rear punch rod are clearance-matched to form a sixth die opening, one end of the sixth rear punch rod is sleeved with a sixth rear sleeve head, the sixth station male die is fixed on the cold heading machine through the sixth male die sleeve, the sixth station female die is fixed on the cold heading machine through the sixth stroke die, the preform e is sent to the sixth die opening, the sixth front punch rod moves toward the sixth station female die, the sixth rear punch rod moves to a predetermined position in the direction of the sixth die opening, and the preform e is deformed by upsetting to form a preform f; The seventh station includes a seventh station positive mold and a seventh station negative mold, the seventh station positive mold includes a seventh positive mold sleeve, one end of the seventh positive mold sleeve is penetrated by a punching rod, the other end of the seventh positive mold sleeve is provided with a seventh pad, the seventh station negative mold includes a punching die core, the seventh station positive mold is fixed on the cold heading machine through the seventh positive mold sleeve, the preform f is delivered to one end of the punching die core, the punching rod moves toward the punching die core to remove the skin in the middle of the preform f to form a through hole, and form a finished product g.

2. The cold forming mold for the hardware bushing of the automobile door system according to claim 1, characterized in that: It also includes a conveying device that clamps the casting and sequentially passes through the first station, the second station, the third station, the fourth station, the fifth station, the sixth station and the seventh station.

3. The cold forming mold for the hardware bushing of the automobile door system according to claim 1, characterized in that: The first station positive membrane is a movable combined structure; The second station positive membrane is a movable combined structure; The third station positive membrane is a movable combined structure; The fourth station positive membrane is a movable combined structure; The fifth station positive membrane is a movable combined structure; The sixth station positive membrane is a movable combined structure; The seventh station positive membrane is a movable combined structure.

4. The cold forming mold for the automobile door system hardware bushing according to claim 1, characterized in that: The first station female mold is a prestressed combined sleeve mold structure; The second station female mold is a prestressed combined sleeve mold structure.

5. The cold forming die for the metal bushing of the automobile door system according to claim 1, characterized in that: The preformed part h is a plastic part, and the cold forming mold is a rigid body.

6. The cold forming die for the metal bushing of the automobile door system according to claim 1, characterized in that: The temperature of the cold forming mold is 20 degrees Celsius, and the friction coefficient of the cold forming mold is 0.

08.

7. The cold forming die for the metal bushing of the automobile door system according to claim 1, characterized in that: The first station is made of a hard alloy material and hot working die steel interference fit; The second station is made of a hard alloy material and hot working die steel with an interference fit; The third workstation is made of a hard alloy material and hot working die steel with interference fit; The fourth station is made of a hard alloy material and hot working die steel interference fit; The fifth station is made of a hard alloy material and hot working die steel interference fit; The sixth station is made of a hard alloy material and hot working die steel interference fit; The seventh workstation is made of a hard alloy material and hot working die steel through interference fit.

8. The cold forming die for the metal bushing of the automobile door system according to claim 1, characterized in that: The wheel rim sizes at both ends of the finished product g are φ11 and φ14 respectively.

9. The cold forming die for the metal bushing of the automobile door system according to claim 1, characterized in that: The size of the middle tooth of the finished product g is φ10.

5.

10. A cold forming process for a metal bushing of an automobile door system, characterized in that: The following steps are involved: S0, cutting materials, cutting rivet nuts as preforms h; S1, using the first station to perform fully enclosed positive extrusion deformation on the preform h to eliminate tearing and form a preform a; S2, using the second station to flip the preform a, positively extruding to stretch the large hole at the riveting end to form a thin wall, and forming a preform b; S3, using the third station to positively extrude the preform b to complete the upsetting of the straight teeth, complete the first forming of the rim and the tooth-shaped part, and form the preform c; S4, using the fourth station to extrude both ends of the preform c at the same time and upset the outer diameter of the head, completing the final forming of the rim and the second forming of the toothed part, to form a preform d; S5, using the fifth station to squeeze the upsetting heads at both ends of the preform d at the same time and stretch the inner holes at both ends at the same time to form a preform e; S6, using the sixth station to extrude the upsetting heads at both ends of the preform e at the same time, and when the inner holes at both ends are stretched, the large bell mouths of the end faces are reversely extruded to form a one-time upsetting, so as to complete the final shaping of the wheel rim size and form the preform f; S7. When punching into the inner hole of the preform f using the seventh station, the waste material in the middle of the preform f is instantly squeezed out. After completion, the preform f and the waste material are transferred from different channels to form a finished product g.

Images