Automobile chassis damping spring high-safety positioning connector and cold heading assembly process thereof

Abstract

The invention discloses an automobile chassis damping spring high-safety positioning connector and a cold heading assembly process thereof. The automobile chassis damping spring high-safety positioning connector comprises a lower connecting base. A lower positioning clamping groove is formed in one side of the top face of the lower connecting base, a lower positioning block is connected to the middle of the lower positioning clamping groove in a clamped mode, a spring telescopic rod is fixedly connected to the top end of the lower positioning block, and an upper positioning block is fixedly connected to the top end of the spring telescopic rod. Wherein an upper connecting seat is arranged on one side of the upper positioning block, an upper connector is slidably connected to the middle of the top end of the upper connecting seat, and a positioning screw rod is arranged on one side of the lower end of the upper connector; wherein the other side of the lower end of the upper connector is fixedly connected with a locking rod, the outer side of the upper connecting base is sleeved with a positioning lantern ring, an inserting rod is inserted into one side of the upper end of the positioning lantern ring, the situation that the upper connecting base rotates is prevented by arranging a spring telescopic rod, and the spring telescopic rod is prevented from falling off through positioning of the inserting rod; the effect of enhancing the use safety of the positioning connector is achieved.

Description

Technical Field

[0001] This invention relates to the field of automotive shock absorption technology, specifically to a high-safety positioning joint for automotive chassis shock absorber springs and its cold heading assembly process. Background Technology

[0002] The shock absorber springs in a car chassis are a key component of the vehicle's suspension system, and their core function is to buffer road impacts. When a vehicle travels over bumpy roads, the springs absorb and disperse the vibration energy from the ground through their own elastic deformation, reducing severe vertical swaying of the vehicle body. At the same time, they work in conjunction with the shock absorbers to suppress repeated spring rebound, thereby improving ride stability, maintaining tire-road contact, and ultimately enhancing ride comfort and handling safety.

[0003] Patent document CN209700328U discloses a high-efficiency automobile chassis shock absorption device, including an automobile chassis and a connecting axle. The automobile chassis has a mounting groove, and a bracket is connected within the mounting groove. A threaded hole is formed at the upper end of the bracket, and a shock-absorbing spring is sleeved on the bracket. A screw is screwed into the threaded hole, and an abutment plate is connected to the top of the screw. The beneficial effects are: by incorporating a fixed steel wire rope structure into the shock absorption device on the automobile chassis, the fixed screw is further secured, preventing it from loosening during prolonged bumpy driving; by setting multiple shock absorption devices in the automobile chassis, and placing one in the middle of the connecting axle, the shock absorption effect of the automobile is enhanced. However, this patent still has the following problems in practical use:

[0004] This shock absorption device uses a fixed steel wire rope to further secure the screw, preventing it from loosening during prolonged vibrations. However, the shock absorption spring tends to pull on the fixed steel wire rope during the shock absorption process, which can easily lead to the detachment of the fixed steel wire rope connection. Furthermore, the screw is still prone to rotation during the contraction of the shock absorption spring, resulting in poor positioning performance of the shock absorption device.

[0005] Therefore, a high-safety positioning joint for automotive chassis shock absorber springs and its cold heading assembly process were proposed to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a high-safety positioning joint for automotive chassis shock absorber springs and its cold heading assembly process, so as to solve the problems currently existing in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-safety positioning joint for automobile chassis shock absorber springs, including a lower connecting seat;

[0008] A telescopic cylinder is fixedly connected to the middle of one side of the lower connecting seat, and a shock-absorbing spring body is sleeved on the outside of the telescopic cylinder.

[0009] Also includes:

[0010] A lower connector is fixedly connected to the middle of the bottom of the lower connector. A lower positioning slot is provided on one side of the top surface of the lower connector. A lower positioning block is engaged in the middle of the lower positioning slot. A spring telescopic rod is fixedly connected to the top of the lower positioning block. An upper positioning block is fixedly connected to the top of the spring telescopic rod.

[0011] The telescopic cylinder has a connecting screw hole in the middle of its top end, a connecting screw rod is threaded into the middle of the connecting screw hole, an upper connecting seat is fixedly connected to the top end of the connecting screw rod, an upper positioning slot is provided on one side of the lower end of the upper connecting seat, an inner slot is provided above the upper connecting seat near the upper positioning slot, a sliding groove is provided in the middle of the top end of the upper connecting seat, an upper connector is slidably connected to the middle of the sliding groove, a positioning wing plate is fixedly connected to one side of the lower end of the upper connector, and a positioning screw rod is threaded into the middle of the positioning wing plate.

[0012] The upper connector has a side slot on the other side of its lower end. A locking rod is fixedly connected to the bottom surface inside the side slot. A positioning collar is sleeved on the outer side of the upper connector. An outer slot is opened on one side of the upper end of the positioning collar. A plug rod is inserted into the middle of the outer slot. A locking groove is opened at one end of the plug rod.

[0013] Preferably, the lower positioning slot, lower positioning block, spring telescopic rod, and upper positioning block are symmetrically arranged on both sides of the lower connecting seat.

[0014] Preferably, the upper positioning slot and the inner slot are symmetrically arranged on both sides of the upper connecting seat, and the inner slot is connected to the sliding slot.

[0015] Preferably, the positioning wing plates are symmetrically fixedly connected to both sides of the lower end of the upper connector, and the lower end of the positioning screw passes through the middle of the upper connecting seat and the sliding groove for rotational connection.

[0016] Preferably, the side slots and locking rods are symmetrically arranged on both sides of the upper connector away from the positioning wing plate.

[0017] Preferably, the positioning collar has a symmetrical L-shaped cross-section, the middle of the lower end of the positioning collar is slidably connected to the outer side of the lower connecting seat, the inner wall of the positioning collar is slidably connected to the outer side of the upper connecting seat, and the bottom surface of the connecting seat is fitted and connected to the bottom surface of the inner side of the positioning collar.

[0018] Preferably, the end of the insertion rod near the locking groove passes through the outer slot, the inner slot and the upper end of the side slot in sequence and is inserted into the locking groove, and the locking rod is inserted into the locking groove.

[0019] Preferably, a cold heading assembly process for a high-safety positioning joint for automotive chassis shock absorber springs includes the following steps:

[0020] S1. Mold pretreatment: Wipe the lower mold cavity of the cold heading mold with ethanol, apply molybdenum disulfide lubricant to the lower positioning slot, and fix the lower connecting seat to the lower mold cavity with the positioning pin. The positioning pin and the pin hole of the lower connecting seat are interference fit.

[0021] S2. Component pre-assembly: Insert the lower positioning block into the lower positioning slot with a engagement depth of 12-15mm. Weld the spring telescopic rod vertically to the top surface of the lower positioning block. After welding, perform stress-relieving annealing. The upper positioning block and the top of the spring telescopic rod are connected by threads and thread-locking adhesive is applied.

[0022] S3. Cold Forging: The upper mold cavity is pressed down at a speed of 40-60 mm / s to cold forge the connecting screw hole at the top of the telescopic cylinder. The initial pressure is increased to 60-80 MPa and held for 2-3 seconds, then increased to 100-120 MPa and held for 4-6 seconds to make the connecting screw and the connecting screw hole form an interference fit. At the same time, the forming boss of the upper mold cavity punches the top of the spring telescopic rod.

[0023] S4. Assembly of the collar: Insert the lower end of the L-shaped section of the positioning collar into the outside of the lower connecting seat, slide it along the guide groove until it fits against the bottom surface of the upper connecting seat, adjust the positioning screw to lower the upper connector until the deviation between the side slot (18) and the inner slot axis is ≤0.05mm.

[0024] S5. Insert rod locking: Insert the insert rod into the outer slot, guide it through the inner slot to the side slot, and lock the rod into the locking groove to a depth of 18-20mm. Use a torque wrench to check that the rotational torque of the insert rod is ≥15-20N·m. Finally, apply sealant to the exposed end of the insert rod.

[0025] S6. Accuracy Verification: The fit clearance between the upper positioning block and the upper positioning slot is checked by a coordinate measuring machine. The sliding resistance between the positioning collar and the upper connecting seat is 5-8N. The compression stroke deviation of the shock-absorbing spring body is ≤±0.5mm.

[0026] Preferably, in S3, the forming boss of the cold heading die is provided with a graded stamping structure. The first-level boss is used for pre-pressing the upper positioning block, and the second-level boss is used for fine pressing. The height difference between the two levels of bosses is 2-3mm. During fine pressing, the die temperature is controlled at 20-25℃, and the temperature difference is maintained at ≤±3℃ by a circulating water cooling system. During the cold heading process, strain gauges are used to monitor the thread deformation of the connecting screw hole in real time, and the deformation is controlled at ≤0.15-0.2mm.

[0027] Preferably, in S5, the locking groove of the insertion rod and the locking rod are fitted with a trapezoidal tenon and mortise structure, the tenon bevel is 1:10-1:15, the roughness of the inner wall of the tenon groove is Ra≤1.6μm, and an axial pressure of 8-12kN is applied by a hydraulic device when engaged. The fit tolerance between the insertion rod and the outer slot is H7 / g6. A 45° guide chamfer is provided at the insertion end. During the insertion process, the axial displacement of the insertion rod is monitored in real time by a displacement sensor.

[0028] Compared with the prior art, the beneficial effects of this invention are as follows: This high-safety positioning joint for automotive chassis shock absorber springs achieves the connection between the upper and lower connecting seats by setting symmetrical spring extension rods on both sides of the telescopic cylinder, preventing the upper connecting seat from rotating in the connecting screw hole through the connecting screw. Furthermore, the positioning collar, upper connecting seat, and upper connector are connected by an insert rod, preventing the spring extension rod from falling off, thus enhancing the safety of the positioning joint. The specific details are as follows:

[0029] 1. This high-safety positioning joint for automotive chassis shock absorber springs connects the upper and lower connecting seats by setting symmetrical spring lifting rods between the upper and lower connecting seats at both ends of the telescopic cylinder. This prevents the upper connecting seat from rotating in the connecting screw hole through the connecting screw, thus preventing the upper connecting seat and the upper joint from falling off during telescopic movement. This makes the shock absorber spring positioning joint safer to use and more practical.

[0030] 2. This high-safety positioning connector for automotive chassis shock absorber springs uses a positioning collar and a plug rod on the outer side of the upper connecting seat. The plug rod connects the positioning collar, the upper connecting seat, and the upper connector, and the locking rod connects with the locking groove to fix the plug rod, thus preventing the spring telescopic rod from falling off. This makes the positioning connector more stable during use and enhances its safety. Therefore, this high-safety positioning connector for automotive chassis shock absorber springs is more practical. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention in its installation state;

[0034] Figure 4 This is a schematic diagram of the overall exploded structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the cross-sectional structure of the sliding groove of the present invention.

[0036] In the diagram: 1. Lower connecting seat; 2. Lower connector; 3. Lower positioning slot; 4. Telescopic cylinder; 5. Shock-absorbing spring body; 6. Lower positioning block; 7. Spring telescopic rod; 8. Upper positioning block; 9. Upper connecting seat; 10. Upper positioning slot; 11. Connecting screw; 12. Connecting screw hole; 13. Inner slot; 14. Sliding groove; 15. Upper connector; 16. Positioning wing plate; 17. Positioning screw; 18. Side slot; 19. Locking rod; 20. Positioning collar; 21. Outer slot; 22. Insert rod; 23. Locking groove. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-5 This invention provides a technical solution: a high-safety positioning connector for automotive chassis shock absorber springs, comprising a lower connecting seat 1; a telescopic cylinder 4 is fixedly connected to the middle of one side of the lower connecting seat 1, and a shock absorber spring body 5 is sleeved on the outer side of the telescopic cylinder 4; further comprising: a lower connector 2 is fixedly connected to the middle of the bottom of the lower connecting seat 1, a lower positioning groove 3 is provided on one side of the top surface of the lower connecting seat 1, a lower positioning block 6 is engaged in the middle of the lower positioning groove 3, a spring telescopic rod 7 is fixedly connected to the top of the lower positioning block 6, and an upper positioning block 8 is fixedly connected to the top of the spring telescopic rod 7; the lower positioning groove 3, the lower positioning block 6, and the spring telescopic rod... The upper positioning block 7 and the upper positioning block 8 are symmetrically arranged on both sides of the lower connecting seat 1; the upper positioning slot 10 and the inner slot 13 are symmetrically opened on both sides of the upper connecting seat 9, and the inner slot 13 is connected to the sliding groove 14; a spring is provided in the middle of the spring telescopic rod 7, and the connection between the lower connecting seat 1 and the upper connecting seat 9 is realized through the setting of the upper positioning block 8 and the lower positioning block 6 at the upper and lower ends of the spring telescopic rod 7, so as to prevent the upper connecting seat 9 from rotating, thereby preventing the upper connecting seat 9 from falling off, and improving the connection stability of the positioning joint, making the use of the car base shock absorber spring safer.

[0039] The telescopic cylinder 4 has a connecting screw hole 12 in the middle of its top end. A connecting screw 11 is threaded into the middle of the connecting screw hole 12. An upper connecting seat 9 is fixedly connected to the top end of the connecting screw 11. An upper positioning groove 10 is provided on one side of the lower end of the upper connecting seat 9. An inner slot 13 is provided above the upper connecting seat 9 near the upper positioning groove 10. A sliding groove 14 is provided in the middle of the top end of the upper connecting seat 9. An upper connector 15 is slidably connected to the middle of the sliding groove 14. A positioning wing plate 16 is fixedly connected to one side of the lower end of the upper connector 15. A positioning screw 17 is threaded into the middle of the positioning wing plate 16. The positioning wing plate 16 is symmetrically fixedly connected to both sides of the lower end of the upper connector 15. The lower end of the positioning screw 17 passes through the middle of the upper connecting seat 9 and the sliding groove 14 and is rotatably connected. By setting a positioning screw 17 on one side of the upper connector 15, it is convenient to adjust the height of the upper connector 15 in the sliding groove 14, thereby facilitating the positioning of the positioning collar 20.

[0040] The upper connector 15 has a side slot 18 on the other side of its lower end. A locking rod 19 is fixedly connected to the bottom surface inside the side slot 18. A positioning collar 20 is sleeved on the outer side of the upper connecting seat 9. An outer slot 21 is opened on one side of the upper end of the positioning collar 20. A rod 22 is inserted into the middle of the outer slot 21. A locking groove 23 is opened at one end of the rod 22. The side slot 18 and the locking rod 19 are symmetrically arranged on both sides of the upper connector 15 away from the positioning wing plate 16. The positioning collar 20 has a symmetrical L-shaped cross section. The middle of the lower end of the positioning collar 20 is slidably connected to the outer side of the lower connecting seat 1. The inner side of the positioning collar 20... The wall and the outer side of the upper connecting seat 9 are slidably connected, and the bottom surface of the connecting seat 9 is attached to the bottom surface of the inner side of the positioning collar 20; the end of the insertion rod 22 near the locking groove 23 passes through the outer slot 21 and the inner slot 13 in sequence and is inserted into the upper end of the side slot 18; the locking rod 19 is inserted into the locking groove 23. Through the connection between the locking rod 19 and the locking groove 23, it is easy to lock the position of the insertion rod 22, thereby facilitating the positioning collar 20 and preventing the spring telescopic rod 7 from falling off, further preventing the upper connecting seat 9 from falling off, making the safety of the car base shock absorber spring positioning joint stronger.

[0041] This invention also discloses a cold heading assembly process for a high-safety positioning joint for automotive chassis shock absorber springs, comprising the following steps:

[0042] S1. Mold pretreatment: Wipe the lower mold cavity of the cold heading mold with ethanol, apply molybdenum disulfide lubricant (thickness 0.01-0.02mm) to the lower positioning groove 3, fix the lower connecting seat 1 to the lower mold cavity with positioning pin (diameter 8-10mm), and ensure that the verticality deviation of the lower connecting seat 1 is ≤0.5° when it is fixed.

[0043] S2. Component pre-assembly: Insert the lower positioning block 6 into the lower positioning slot 3 with a engagement depth of 12-15mm. Weld the spring telescopic rod 7 vertically to the top surface of the lower positioning block 6 (welding angle deviation ≤1°). After welding, perform stress-relief annealing (temperature 200-250℃, heat preservation for 1-2h). The upper positioning block 8 and the top of the spring telescopic rod (7) are connected by threads (thread specification M8×1), and thread locking adhesive is applied (curing torque 10-15N·m).

[0044] S3. Cold Forging: The upper mold cavity is pressed down at a speed of 40-60 mm / s to cold forge the connecting screw hole 12 at the top of the telescopic cylinder 4. The pressure is initially increased to 60-80 MPa and held for 2-3 seconds, then increased to 100-120 MPa and held for 4-6 seconds, so that the connecting screw 11 and the connecting screw hole 12 form an interference fit (interference amount 0.08-0.12 mm). At the same time, the forming boss of the upper mold cavity punches the top of the spring telescopic rod 7 to ensure that the flatness of the top surface of the upper positioning block 8 is ≤0.02 mm and the fit clearance with the upper positioning slot 10 is ≤0.05 mm.

[0045] S4. Collar Assembly: Insert the lower end of the L-shaped section of the positioning collar 20 onto the outside of the lower connecting seat 1, slide it along the guide groove (depth 5-8mm) until it fits against the bottom surface of the upper connecting seat 9, adjust the positioning screw 17 to lower the upper connector 15 until the deviation between the axis of the side slot 18 and the inner slot 13 is ≤0.05mm.

[0046] S5. Insert rod locking: Insert the insert rod 22 into the outer slot 21, guide it through the inner slot 13 to the side slot 18, and lock the locking rod 19 into the locking groove 23 to a depth of 18-20mm. Use a torque wrench to check that the rotational torque of the insert rod 22 is ≥15-20N·m. Finally, apply sealant (temperature resistant from -40℃ to 120℃) to the exposed end of the insert rod 22.

[0047] S6. Accuracy verification: The fit gap between the upper positioning block 8 and the upper positioning slot (10) is 0.03-0.05mm, the sliding resistance between the positioning collar 20 and the upper connecting seat 9 is 5-8N, and the compression stroke deviation of the shock-absorbing spring body 5 is ≤±0.5mm.

[0048] In S3, the forming boss of the cold heading die is equipped with a graded stamping structure. The first-level boss (16-18mm in diameter) is used for pre-pressing the upper positioning block 8, and the second-level boss (12-14mm in diameter) is used for precision pressing. The height difference between the two levels of bosses is 2-3mm. During precision pressing, the die temperature is controlled at 20-25℃, and the temperature difference is maintained at ≤±3℃ through a circulating water cooling system to avoid overheating of the material and plastic deformation. During the cold heading process, strain gauges are used to monitor the thread deformation of the connecting screw hole 12 in real time, controlling the deformation to ≤0.15-0.2mm to ensure that the effective engagement length of the thread is ≥1.5 times the pitch.

[0049] In S5, the locking groove 23 of the insertion rod 22 and the locking rod 19 are fitted with a trapezoidal mortise and tenon structure, with a tenon bevel of 1:10-1:15 and a groove inner wall roughness Ra≤1.6μm. During engagement, an axial pressure of 8-12kN is applied by a hydraulic device to ensure that the insertion depth deviation of the locking rod 19 is ≤0.5mm. The fit tolerance between the insertion rod 22 and the outer slot 21 is H7 / g6. The insertion end is provided with a 45° guide chamfer (chamfer width 2-3mm). During insertion, the axial displacement of the insertion rod 22 is monitored in real time by a displacement sensor, and the positioning accuracy is controlled within ±0.03mm.

[0050] Working principle: When using the high safety positioning joint for the chassis shock absorber spring, firstly, the shock absorber spring body 5 is sleeved on the outside of the telescopic cylinder 4, and then the upper connecting seat 9 is threadedly connected to the connecting screw hole 12 at the top of the telescopic cylinder 4 through the connecting screw 11.

[0051] Next, the spring telescopic rod 7 is inserted into the lower positioning slot 3 and the upper positioning slot 10 through the lower positioning block 6 and the upper positioning block 8 respectively. Then, the positioning collar 20 is sleeved on the outside of the lower connecting seat 1 and the positioning collar 20 is slid upward so that the positioning collar 20 overlaps with the lower end of the upper connecting seat 9.

[0052] Finally, insert the end of the insertion rod 22 near the locking groove 23 through the upper ends of the outer slot 21, inner slot 13 and side slot 18 in sequence, and rotate the positioning screw 17 so that the positioning screw 17 drives the upper connector 15 to rise in the sliding groove 14 through the positioning wing plate 16, so that the locking rod 19 is inserted into the locking groove 23. Then, install the shock-absorbing spring through the upper connector 15 and the lower connector 2.

[0053] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-safety positioning joint for automobile chassis shock absorber springs, including a lower connecting seat (1); A telescopic cylinder (4) is fixedly connected to the middle of one side of the lower connecting seat (1), and a shock-absorbing spring body (5) is sleeved on the outside of the telescopic cylinder (4). Its features are, Also includes: The lower connector (2) is fixedly connected to the middle of the bottom of the lower connector (1). A lower positioning slot (3) is opened on one side of the top surface of the lower connector (1). A lower positioning block (6) is engaged in the middle of the lower positioning slot (3). A spring telescopic rod (7) is fixedly connected to the top of the lower positioning block (6). An upper positioning block (8) is fixedly connected to the top of the spring telescopic rod (7). Among them, the telescopic cylinder (4) has a connecting screw hole (12) in the middle of the top end, and a connecting screw (11) is threaded in the middle of the connecting screw hole (12). The top end of the connecting screw (11) is fixedly connected to an upper connecting seat (9). An upper positioning slot (10) is opened on one side of the lower end of the upper connecting seat (9). An inner slot (13) is opened above the upper connecting seat (9) near the upper positioning slot (10). A sliding groove (14) is opened in the middle of the top end of the upper connecting seat (9). An upper connector (15) is slidably connected in the middle of the sliding groove (14). A positioning wing plate (16) is fixedly connected on one side of the lower end of the upper connector (15). A positioning screw (17) is threaded in the middle of the positioning wing plate (16). Among them, a side slot (18) is provided on the other side of the lower end of the upper connector (15). A locking rod (19) is fixedly connected to the bottom surface inside the side slot (18). A positioning collar (20) is sleeved on the outer side of the upper connector (9). An outer slot (21) is provided on one side of the upper end of the positioning collar (20). A plug rod (22) is inserted in the middle of the outer slot (21). A locking groove (23) is provided at one end of the plug rod (22).

2. The high-safety positioning joint for automotive chassis shock absorber springs according to claim 1, characterized in that: The lower positioning slot (3), lower positioning block (6), spring telescopic rod (7) and upper positioning block (8) are symmetrically arranged on both sides of the lower connecting seat (1).

3. The high-safety positioning joint for automotive chassis shock absorber springs according to claim 1, characterized in that: The upper positioning slot (10) and the inner slot (13) are symmetrically opened on both sides of the upper connecting seat (9), and the inner slot (13) is connected to the sliding groove (14).

4. The high-safety positioning joint for automotive chassis shock absorber springs according to claim 1, characterized in that: The positioning wing plate (16) is symmetrically fixedly connected to both sides of the lower end of the upper connector (15), and the lower end of the positioning screw (17) passes through the upper connecting seat (9) and is rotatably connected to the middle of the sliding groove (14).

5. The high-safety positioning joint for automotive chassis shock absorber springs according to claim 1, characterized in that: The side slots (18) and locking rods (19) are symmetrically arranged on both sides of the upper connector (15) away from the positioning wing plate (16).

6. The high-safety positioning joint for automotive chassis shock absorber springs according to claim 1, characterized in that: The positioning collar (20) has a symmetrical L-shaped cross section. The middle of the lower end of the positioning collar (20) is slidably connected to the outer side of the lower connecting seat (1). The inner wall of the positioning collar (20) is slidably connected to the outer side of the upper connecting seat (9). The bottom surface of the connecting seat (9) is attached to the bottom surface of the inner side of the positioning collar (20).

7. The high-safety positioning joint for automotive chassis shock absorber springs according to claim 1, characterized in that: The end of the insertion rod (22) near the locking groove (23) passes through the outer slot (21), the inner slot (13) and the upper end of the side slot (18) in sequence and is inserted into it. The locking rod (19) is inserted into the locking groove (23).

8. A cold heading assembly process for a high-safety positioning joint for automotive chassis shock absorber springs, applied to the high-safety positioning joint for automotive chassis shock absorber springs as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Mold pretreatment: Wipe the lower mold cavity of the cold heading mold with ethanol, apply molybdenum disulfide lubricant in the lower positioning slot (3), fix the lower connecting seat (1) to the lower mold cavity by positioning pin, and the positioning pin and the pin hole of the lower connecting seat (1) are interference fit. S2. Component pre-assembly: Insert the lower positioning block (6) into the lower positioning slot (3) with a engagement depth of 12-15mm. The spring telescopic rod (7) is vertically welded to the top surface of the lower positioning block (6). After welding, stress-relieving annealing is performed. The upper positioning block (8) and the top of the spring telescopic rod (7) are connected by threads and thread locking glue is applied. S3, Cold Forging: The upper mold cavity is pressed down at a speed of 40-60 mm / s to cold forge the connecting screw hole (12) at the top of the telescopic cylinder (4). The pressure is first increased to 60-80 MPa and held for 2-3 seconds, then increased to 100-120 MPa and held for 4-6 seconds, so that the connecting screw (11) and the connecting screw hole (12) form an interference fit; at the same time, the forming boss of the upper mold cavity punches the top of the spring telescopic rod (7); S4. Assembly of the collar: Insert the lower end of the L-shaped section of the positioning collar (20) into the outside of the lower connecting seat (1), slide it along the guide groove until it fits against the bottom surface of the upper connecting seat (9), adjust the positioning screw (17) to lower the upper connector (15) until the deviation of the axis between the side slot (18) and the inner slot (13) is ≤0.05mm. S5, Insert rod locking: Insert the insert rod (22) into the outer slot (21), guide it through the inner slot (13) to the side slot (18), the locking rod (19) and the locking groove (23) are engaged to a depth of 18-20mm, use a torque wrench to check the rotation torque of the insert rod (22) to be ≥15-20N·m, and finally apply sealant to the exposed end of the insert rod (22); S6. Accuracy verification: The fit clearance between the upper positioning block (8) and the upper positioning slot (10) is detected by a coordinate measuring machine. The sliding resistance between the positioning collar (20) and the upper connecting seat (9) is 5-8N. The compression stroke deviation of the shock-absorbing spring body (5) is ≤±0.5mm.

9. The cold heading assembly process of the high-safety positioning joint for automotive chassis shock absorber springs according to claim 8, characterized in that, In S3, the forming boss of the cold heading mold is provided with a graded stamping structure. The first-level boss is used for pre-pressing the upper positioning block (8), and the second-level boss is used for fine pressing. The height difference between the two levels of bosses is 2-3mm. During fine pressing, the mold temperature is controlled at 20-25℃. The temperature difference is maintained at ≤±3℃ by a circulating water cooling system. During the cold heading process, strain gauges are used to monitor the thread deformation of the connecting screw hole (12) in real time and control the deformation to ≤0.15-0.2mm.

10. The cold heading assembly process of the high-safety positioning joint for automotive chassis shock absorber springs according to claim 8, characterized in that, In S5, the locking groove (23) of the insertion rod (22) and the locking rod (19) are fitted with a trapezoidal tenon and mortise structure, with a tenon bevel of 1:10-1:15 and a groove inner wall roughness Ra≤1.6μm. When engaged, an axial pressure of 8-12kN is applied by a hydraulic device. The fit tolerance between the insertion rod (22) and the outer slot (21) is H7 / g6. A 45° guide chamfer is provided at the insertion end. During the insertion process, the axial displacement of the insertion rod (22) is monitored in real time by a displacement sensor.

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