High safety positioning joint of automobile chassis damping spring and cold upsetting assembly process thereof

Abstract

The application discloses a high-safety positioning joint of a car chassis damping spring and a cold upsetting assembly process thereof, which comprises a lower connecting base, and further comprises a lower positioning clamping groove formed in one side of the top surface of the lower connecting base, a lower positioning block clamped in the middle of the lower positioning clamping groove, a spring telescopic rod fixedly connected to the top end of the lower positioning block, and an upper positioning block fixedly connected to the top end of the spring telescopic rod; wherein one side of the upper positioning block is provided with an upper connecting base, the middle of the top end of the upper connecting base is slidably connected with an upper joint, and one side of the lower end of the upper joint is provided with a positioning screw rod; wherein the other side of the lower end of the upper joint is fixedly connected with a locking rod, the outer side of the upper connecting base is sleeved with a positioning sleeve ring, and one side of the upper end of the positioning sleeve ring is inserted with an insertion rod; the spring telescopic rod is arranged to prevent the upper connecting base from rotating, and the insertion rod is arranged to prevent the spring telescopic rod from falling off, so that the use safety of the positioning joint is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile shock absorption, in particular to a high-safety positioning joint of an automobile chassis shock absorption spring and a cold upsetting assembly process thereof. BACKGROUND

[0002] The automobile chassis shock absorption spring is a key component of the vehicle suspension system, and its core function is to buffer road impact. When the vehicle travels over a bumpy road section, the spring absorbs and disperses the vibration energy from the ground through its elastic deformation, reducing the violent shaking of the vehicle body in the vertical direction, while working in coordination with the shock absorber to suppress the repeated rebound of the spring, thereby improving the ride stability, maintaining the adhesion of the tire to the ground, and ultimately enhancing the driving comfort and control safety.

[0003] The patent document with publication number CN209700328U discloses a high-efficiency automobile chassis shock absorption device, which includes an automobile chassis and a connecting shaft rod. An installation slot is formed on the automobile chassis, and a support is connected in the installation slot. A threaded hole is formed at the upper end of the support, and a shock absorption spring is sleeved on the support. A screw rod is screwed into the threaded hole, and an abutting plate is connected to the top end of the screw rod. The beneficial effect is that the shock absorption device on the automobile chassis is provided with a fixed steel wire rope structure, which further fixes the screw rod to prevent it from loosening during long-term jolting. By providing multiple shock absorption devices on the chassis of the automobile and a shock absorption device in the middle of the connecting shaft, the shock absorption effect of the automobile is enhanced. However, this patent still has the following problems in actual use:

[0004] The shock absorption device achieves further fixation of the screw rod by setting a fixed steel wire rope, which prevents the screw rod from loosening during long-term jolting. However, the fixed steel wire rope is easily pulled during the shock absorption process of the shock absorption spring, which can cause the fixed steel wire rope connection to fall off. In addition, the screw rod is still prone to rotation during the contraction of the shock absorption spring, resulting in poor positioning effect of the shock absorption device.

[0005] Therefore, the high-safety positioning joint of the automobile chassis shock absorption spring and the cold upsetting assembly process thereof are proposed to solve the problems mentioned above. SUMMARY

[0006] The purpose of the present application is to provide a high-safety positioning joint of an automobile chassis shock absorption spring and a cold upsetting assembly process thereof to solve the problems mentioned in the background.

[0007] To achieve the above purpose, the present application provides the following technical solution: a high-safety positioning joint of an automobile chassis shock absorption spring, which includes a lower connecting seat;

[0008] The middle of one side of the lower connecting base is fixedly connected with a telescopic oil cylinder, and the outer side of the telescopic oil cylinder is sleeved with a damping spring body;

[0009] Further comprising:

[0010] The middle of the bottom of the lower connecting base is fixedly connected with a lower connector, one side of the top surface of the lower connecting base is provided with a lower positioning clamping groove, the middle of the lower positioning clamping groove is clamped and connected with a lower positioning block, the top end of the lower positioning block is fixedly connected with a spring telescopic rod, and the top end of the spring telescopic rod is fixedly connected with an upper positioning block;

[0011] The middle of the top end of the telescopic oil cylinder is provided with a connecting screw hole, the middle of the connecting screw hole is threadedly connected with a connecting screw rod, the top end of the connecting screw rod is fixedly connected with an upper connecting base, one side of the lower end of the upper connecting base is provided with an upper positioning clamping groove, the upper side of the upper connecting base close to the upper positioning clamping groove is provided with an inner insertion groove, the middle of the top end of the upper connecting base is provided with a sliding groove, the middle of the sliding groove is slidably connected with an upper connector, one side of the lower end of the upper connector is fixedly connected with a positioning wing plate, and the middle of the positioning wing plate is threadedly connected with a positioning screw rod;

[0012] The other side of the lower end of the upper connector is provided with a side insertion groove, the bottom surface in the side insertion groove is fixedly connected with a locking rod, the outer side of the upper connecting base is sleeved with a positioning sleeve ring, one side of the upper end of the positioning sleeve ring is provided with an outer insertion groove, the middle of the outer insertion groove is inserted with an insertion rod, and one end of the insertion rod is provided with a locking groove.

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

[0014] Preferably, the upper positioning clamping groove and the inner insertion groove are symmetrically arranged on both sides of the upper connecting base, and the inner insertion groove is in communication with the sliding groove.

[0015] Preferably, the positioning wing plate is symmetrically fixedly connected to both sides of the lower end of the upper connector, and the lower end of the positioning screw rod is rotatably connected to the middle of the sliding groove through the upper connecting base.

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

[0017] Preferably, the cross section of the positioning sleeve ring is a symmetric L-shaped, the middle of the lower end of the positioning sleeve ring is slidably connected to the outer side of the lower connecting base, the inner wall of the positioning sleeve ring is slidably connected to the outer side of the upper connecting base, and the bottom surface of the inner side of the positioning sleeve ring is in abutting connection with the bottom surface of the upper connecting base.

[0018] Preferably, one end of the insertion rod close to the locking groove is inserted into the upper end of the outer insertion groove, the inner insertion groove and the side insertion groove in sequence, and the locking rod is inserted into the locking groove.

[0019] Preferably, a cold heading assembly process of a high-safety positioning joint of a car chassis shock-absorbing spring comprises the following steps:

[0020] S1, mold pretreatment: using ethanol to wipe the lower mold cavity of the cold heading mold, applying molybdenum disulfide lubricant in the lower positioning slot, and fixing the lower connecting seat in the lower mold cavity through the positioning pin, which is in interference fit with the pin hole of the lower connecting seat;

[0021] S2, component pre-assembly: the lower positioning block is clamped into the lower positioning slot with a clamping depth of 12-15 mm, and the spring telescopic rod is vertically welded to the top surface of the lower positioning block, and stress relief annealing is performed after welding; the upper positioning block is threadedly connected with the top end of the spring telescopic rod, and thread locking glue is applied;

[0022] S3, cold heading forming: the upper mold cavity is pressed down at a speed of 40-60 mm / s, the connecting screw hole at the top end of the telescopic oil cylinder is cold headed, the first pressure is increased to 60-80 MPa and maintained for 2-3 s, and then the pressure is increased to 100-120 MPa and maintained for 4-6 s, so that the connecting screw rod and the connecting screw hole form an interference fit; at the same time, the shaping boss of the upper mold cavity stamps the top end of the spring telescopic rod;

[0023] S4, ring assembly: the L-shaped cross-section lower end of the positioning ring is sleeved outside the lower connecting seat, and is slid along the guide groove to be attached to the bottom surface of the upper connecting seat, the positioning screw is adjusted to lower the upper joint, and the deviation between the side insertion groove (18) and the inner insertion groove axis is ≤0.05 mm;

[0024] S5, rod locking: the insertion rod is inserted into the outer insertion groove, guided through the inner insertion groove to the side insertion groove, the clamping depth of the locking rod and the locking groove is 18-20 mm, the rotation torque of the insertion rod is detected by using a torque wrench ≥15-20 N·m, and finally sealing glue is applied to the exposed end of the insertion rod;

[0025] S6, precision check: the fitting gap between the upper positioning block and the upper positioning slot is detected by a three-coordinate measuring instrument, the sliding resistance between the positioning ring and the upper connecting seat is 5-8 N, and the compression stroke deviation of the shock-absorbing spring body is ≤±0.5 mm.

[0026] Preferably, in S3, the shaping boss of the cold heading mold is provided with a stepped stamping structure, a first-stage boss is used for pre-pressing the upper positioning block, a second-stage boss is used for fine pressing, the height difference between the two-stage bosses is 2-3 mm, the mold temperature is controlled at 20-25 ℃ during fine pressing, the temperature difference is maintained ≤±3 ℃ by a circulating water cooling system, the thread deformation amount of the connecting screw hole is monitored in real time by using a strain gauge during the cold heading process, and the deformation amount is controlled ≤0.15-0.2 mm.

[0027] Preferably, in S5, the locking groove of the insertion rod cooperates with the locking rod in a dovetail structure, the dovetail slope is 1:10-1:15, the inner wall roughness of the dovetail groove is Ra≤1.6μm, an axial pressure of 8-12kN is applied by the hydraulic device when engaging, the insertion rod and the outer insertion groove have a cooperation tolerance of H7 / g6, a 45° guide chamfer is arranged at the insertion end, and the axial displacement of the insertion rod is monitored in real time by a displacement sensor during the insertion process.

[0028] Compared with the prior art, the automobile chassis shock absorbing spring high safety positioning joint has the advantages that: the symmetrical spring lifting and retracting rods are arranged between the upper connecting seat and the lower connecting seat at both ends of the telescopic oil cylinder, the upper connecting seat and the lower connecting seat are connected, the rotation of the upper connecting seat in the connecting screw hole through the connecting screw rod is prevented, the positioning sleeve ring, the upper connecting seat and the upper joint are connected through the insertion rod, the spring lifting and retracting rod is prevented from falling off, the safety of the positioning joint is improved, and the practicality of the automobile chassis shock absorbing spring high safety positioning joint is improved.

[0029] 1. The automobile chassis shock absorbing spring high safety positioning joint, through the symmetrical spring lifting and retracting rods arranged between the upper connecting seat and the lower connecting seat at both ends of the telescopic oil cylinder, the upper connecting seat and the lower connecting seat are connected, the rotation of the upper connecting seat in the connecting screw hole through the connecting screw rod is prevented, the safety of the positioning joint is improved, and the practicality of the automobile chassis shock absorbing spring high safety positioning joint is improved.

[0030] 2. The automobile chassis shock absorbing spring high safety positioning joint, through the symmetrical spring lifting and retracting rods arranged between the upper connecting seat and the lower connecting seat at both ends of the telescopic oil cylinder, the upper connecting seat and the lower connecting seat are connected, the rotation of the upper connecting seat in the connecting screw hole through the connecting screw rod is prevented, the safety of the positioning joint is improved, and the practicality of the automobile chassis shock absorbing spring high safety positioning joint is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0032] Figure 2 It is a schematic diagram of the overall structure of the present application;

[0033] Figure 3 It is a schematic diagram of the overall structure of the present application;

[0034] Figure 4 It is a schematic diagram of the overall structure of the present application;

[0035] Figure 5 It is a schematic diagram of the overall structure of the present application;

[0036] In the figure: 1, the lower connecting seat; 2, the lower joint; 3, the lower positioning slot; 4, the telescopic oil cylinder; 5, the shock spring body; 6, the lower positioning block; 7, the spring telescopic rod; 8, the upper positioning block; 9, the upper connecting seat; 10, the upper positioning slot; 11, the connecting screw; 12, the connecting screw hole; 13, the inner insertion slot; 14, the sliding slot; 15, the upper joint; 16, the positioning wing plate; 17, the positioning screw; 18, the side insertion slot; 19, the locking rod; 20, the positioning sleeve ring; 21, the outer insertion slot; 22, the insertion rod; 23, the locking slot. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0038] Please refer to Figures 1-5 The present application provides a technical solution: a high-safety positioning joint for a shock spring of an automobile chassis, comprising a lower connecting seat 1. A telescopic oil cylinder 4 is fixedly connected to the middle of one side of the lower connecting seat 1, and a shock spring body 5 is sleeved on the outer side of the telescopic oil cylinder 4. The bottom of the lower connecting seat 1 is fixedly connected to a lower joint 2, and a lower positioning slot 3 is formed in one side of the top surface of the lower connecting seat 1. A lower positioning block 6 is symmetrically connected to the middle of the lower positioning slot 3, and a spring telescopic rod 7 is fixedly connected to the top end of the lower positioning block 6. The top end of the spring telescopic rod 7 is fixedly connected to an upper positioning block 8. The lower positioning slot 3, the lower positioning block 6, the spring telescopic rod 7, and the upper positioning block 8 are symmetrically arranged on both sides of the lower connecting seat 1. An upper positioning slot 10 and an inner insertion slot 13 are symmetrically formed on both sides of an upper connecting seat 9, and the inner insertion slot 13 is in communication with a sliding slot 14. A spring is arranged in the middle of the spring telescopic rod 7. The upper positioning block 8 and the lower positioning block 6 arranged at the upper and lower ends of the spring telescopic rod 7 achieve the connection of the lower connecting seat 1 and the upper connecting seat 9, prevent the upper connecting seat 9 from rotating, prevent the upper connecting seat 9 from falling off, improve the stability of the positioning joint connection, and make the shock spring of the automobile chassis more secure in use.

[0039] The middle of the top end of the telescopic oil cylinder 4 is provided with a connecting screw hole 12, the middle of the connecting screw hole 12 is threadedly connected with a connecting screw rod 11, the top end of the connecting screw rod 11 is fixedly connected with an upper connecting seat 9, one side of the lower end of the upper connecting seat 9 is provided with an upper positioning clamping groove 10, the upper connecting seat 9 is provided with an inner insertion groove 13 above the upper positioning clamping groove 10, the middle of the top end of the upper connecting seat 9 is provided with a sliding groove 14, the middle of the sliding groove 14 is slidably connected with an upper joint 15, one side of the lower end of the upper joint 15 is fixedly connected with a positioning wing plate 16, the middle of the positioning wing plate 16 is threadedly connected with a positioning screw rod 17, the positioning wing plate 16 is symmetrically fixedly connected on both sides of the lower end of the upper joint 15, and the lower end of the positioning screw rod 17 is rotatably connected with the middle of the sliding groove 14 through the upper connecting seat 9.

[0040] The other side of the lower end of the upper joint 15 is provided with a side insertion groove 18, the bottom surface in the side insertion groove 18 is fixedly connected with a locking rod 19, the outer side of the upper connecting seat 9 is sleeved with a positioning sleeve ring 20, one side of the upper end of the positioning sleeve ring 20 is provided with an outer insertion groove 21, the middle of the outer insertion groove 21 is inserted with an insertion rod 22, and one end of the insertion rod 22 is provided with a locking groove 23; the side insertion groove 18 and the locking rod 19 are symmetrically arranged on both sides of the upper joint 15 away from the positioning wing plate 16; the cross section of the positioning sleeve ring 20 is a symmetric L-shaped, the middle of the lower end of the positioning sleeve ring 20 is slidably connected with the outer side of the lower connecting seat 1, the inner wall of the positioning sleeve ring 20 is slidably connected with the outer side of the upper connecting seat 9, and the bottom surface of the inner side of the positioning sleeve ring 20 is attached to the bottom surface of the upper connecting seat 9; one end of the insertion rod 22 close to the locking groove 23 is inserted with the upper end of the side insertion groove 18, the outer insertion groove 21 and the inner insertion groove 13 in sequence, the locking rod 19 is inserted with the locking groove 23, the locking rod 19 and the locking groove 23 are connected, the position of the insertion rod 22 is locked, the positioning sleeve ring 20 is positioned, the spring telescopic rod 7 is prevented from falling off, the falling off of the upper connecting seat 9 is further prevented, and the safety of the automobile chassis damping spring high safety positioning joint is higher.

[0041] The application further discloses a cold heading assembly process of the automobile chassis damping spring high safety positioning joint.

[0042] S1, mold pretreatment: the lower die cavity of the cold heading mold is wiped with ethanol, molybdenum disulfide lubricant (thickness 0.01-0.02mm) is applied in the lower positioning clamping groove 3, the lower connecting seat 1 is fixed in the lower die cavity through the positioning pin (diameter 8-10mm), the positioning pin is in interference fit (interference amount 0.03-0.05mm) with the pin hole of the lower connecting seat 1, and the perpendicularity deviation of the lower connecting seat 1 during fixation is ensured to be less than or equal to 0.5°.

[0043] S2, component pre-installation: the lower positioning block 6 is clamped into the lower positioning clamping groove 3, the clamping depth is 12-15 mm, the spring telescopic rod 7 is vertically welded on the top surface of the lower positioning block 6 (the welding angle deviation is less than or equal to 1°), and stress relief annealing is performed after welding (temperature 200-250℃, holding time 1-2h); the upper positioning block 8 is threadedly connected with the top end of the spring telescopic rod (7) (thread specification M8x1), and thread locking glue is applied (curing torque 10-15 N.m).

[0044] S3, cold upsetting forming: the upper die cavity is pressed down at a speed of 40-60 mm / s, the connecting screw hole 12 at the top end of the telescopic oil cylinder 4 is cold upset, the first pressure is increased to 60-80 MPa and maintained for 2-3 s, then increased to 100-120 MPa and maintained for 4-6 s, so that the connecting screw rod 11 and the connecting screw hole 12 form an interference fit (interference amount 0.08-0.12 mm); at the same time, the shaping boss of the upper die cavity stamps the top end of the spring telescopic rod 7, ensuring that the flatness of the top surface of the upper positioning block 8 is less than or equal to 0.02 mm, and the fitting gap of the upper positioning clamping groove 10 is less than or equal to 0.05 mm.

[0045] S4, collar assembly: the L-shaped cross-section lower end of the positioning collar 20 is sleeved outside the lower connecting seat 1, slid along the guide groove (depth 5-8 mm) to be in close contact with the bottom surface of the upper connecting seat 9, the upper joint 15 is lowered by adjusting the positioning screw 17 until the side insertion groove 18 and the inner insertion groove 13 have an axial deviation of less than or equal to 0.05 mm.

[0046] S5, plug rod locking: the plug rod 22 is inserted into the outer insertion groove 21, guided to the side insertion groove 18 through the inner insertion groove 13, the clamping depth of the locking rod 19 and the locking groove 23 is 18-20 mm, the rotational torque of the plug rod 22 is detected by using a torque wrench, which is greater than or equal to 15-20 N.m, and finally sealing glue (temperature resistance -40℃ to 120℃) is applied to the exposed end of the plug rod 22.

[0047] S6, precision verification: the fitting gap of the upper positioning block 8 and the upper positioning clamping groove (10) is detected by a three-coordinate measuring instrument, which is 0.03-0.05 mm, the sliding resistance of the positioning collar 20 and the upper connecting seat 9 is 5-8 N, and the compression stroke deviation of the shock absorbing spring body 5 is less than or equal to ±0.5 mm.

[0048] In S3, the shaping boss of the cold upsetting die is provided with a stepped stamping structure, a first-stage boss (diameter 16-18 mm) for pre-pressing the upper positioning block 8 and a second-stage boss (diameter 12-14 mm) for fine pressing, the height difference between the two-stage bosses is 2-3 mm, the die temperature is controlled at 20-25℃ during fine pressing, the temperature difference is maintained at less than or equal to ±3℃ by a circulating water cooling system, and plastic deformation caused by overheating of the material is avoided. During the cold upsetting process, a strain gauge is used to monitor the thread deformation of the connecting screw hole 12 in real time, the deformation amount is controlled to be less than or equal to 0.15-0.2 mm, and the effective engagement length of the thread is ensured to be greater than or equal to 1.5 times the pitch.

[0049] In S5, the matching of the locking groove 23 of the insertion rod 22 and the locking rod 19 adopts a dovetail structure, the tenon slope is 1:10-1:15, the roughness Ra of the inner wall of the mortise is ≤1.6μm, when the insertion is completed, 8-12kN axial pressure is applied through the hydraulic device to ensure that the embedding depth deviation of the locking rod 19 is ≤0.5mm. The tolerance of the insertion rod 22 and the outer insertion groove 21 is H7 / g6, a 45° guide chamfer (chamfer width 2-3mm) is arranged at the insertion end, the axial displacement of the insertion rod 22 is monitored in real time through the displacement sensor during the insertion process, and the positioning accuracy is controlled within ±0.03mm.

[0050] Working principle: when the high-safety positioning joint of the automobile chassis shock-absorbing spring is used, first, the shock-absorbing spring body 5 is sleeved on the outside of the telescopic oil cylinder 4, then the upper connecting seat 9 is threadedly connected with the connecting screw hole 12 at the top end of the telescopic oil cylinder 4 through the connecting screw rod 11.

[0051] Secondly, the spring telescopic rod 7 is respectively inserted into the lower positioning clamping groove 3 and the upper positioning clamping groove 10 through the lower positioning block 6 and the upper positioning block 8, then the positioning sleeve ring 20 is sleeved on the outside of the lower connecting seat 1, and the positioning sleeve ring 20 is slid upward to be overlapped with the lower end of the upper connecting seat 9.

[0052] Finally, the end of the insertion rod 22 close to the locking groove 23 is sequentially inserted into the upper end of the outer insertion groove 21, the inner insertion groove 13 and the side insertion groove 18, and the positioning screw rod 17 is rotated to drive the upper joint 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, and then the shock-absorbing spring can be installed through the upper joint 15 and the lower joint 2.

[0053] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

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 top of the telescopic cylinder (4) is provided with a connecting screw hole (12) in the middle, and a connecting screw (11) is threaded in the middle of the connecting screw hole (12). The top of the connecting screw (11) is fixedly connected to an upper connecting seat (9). An upper positioning slot (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 slot (10). A sliding groove (14) is provided in the middle of the top 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), and a locking groove (23) is provided at one end of the plug rod (22). 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). 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 inner side of the positioning collar (20) is in contact with the bottom surface of the upper connecting seat (9). 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).

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 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).

5. 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 1-4, 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 with the 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, and weld the spring telescopic rod (7) vertically 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 to the side slot (18) through the inner slot (13), 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 gap 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, and the compression stroke deviation of the shock-absorbing spring body (5) is ≤±0.5mm.

6. The cold heading assembly process of the high-safety positioning joint for automotive chassis shock absorber springs according to claim 5, 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.

7. The cold heading assembly process of the high-safety positioning joint for automotive chassis shock absorber springs according to claim 5, 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 set 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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