Welding tool for piston rod of automobile shock absorber

Abstract

The utility model belongs to the technical field of automobile shock absorbers, and particularly relates to an automobile shock absorber piston rod welding tool and a welding method. The welding tool comprises an electrode made of a copper alloy material, and the electrode comprises an electrode body and a protruding part; an upper column cavity and a lower column cavity which are adjacently arranged up and down are formed in the electrode body, the upper column cavity, the lower column cavity and the electrode body are coaxially arranged, and a mounting through hole is formed in the protruding part; a steel sleeve is fixedly arranged in the upper column cavity, and an inner cavity of the steel sleeve and the lower column cavity are coaxially and adjacently arranged to form a threaded rod positioning cavity; a threaded rod positioning piece is further included. The rigidity and strength of the side wall of the upper portion of the threaded rod positioning cavity are improved by arranging the steel sleeve forming the threaded rod positioning cavity with the lower column cavity, the service life of the welding tool is prolonged, and the production cost is saved; the radial positioning precision of the threaded rod is improved, and the welding coaxiality of the threaded rod and the piston rod body is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile shock absorber, concretely relates to a kind of automobile shock absorber piston rod welding tool. BACKGROUND

[0002] Automobile shock absorber is the important component of automobile suspension, and its main function is to buffer vibration during automobile driving, which has important influence on the stability and safety of automobile driving. Automobile shock absorber includes cylinder body, piston and piston rod, the lower end of piston rod is connected with piston, and the upper end of piston rod is supported and connected on automobile suspension. During vehicle driving, automobile suspension drives piston rod and piston to reciprocate axially, therefore, as important supporting component of shock absorber, piston rod requires high strength and machining precision. As shown in Fig. Figure 1 Piston rod includes piston rod body 91 and threaded rod coaxially welded, and the coaxiality between the two is required to be below φ1mm. Among them, threaded rod includes threaded segment 92 and fusion segment 93 arranged coaxially, and the thread on threaded segment 92 can be full tooth thread or non-full tooth thread; the outer diameter of fusion segment 93 is larger than that of threaded segment 92, and the two have shaft shoulder, which facilitates clamping positioning during threaded rod welding operation. During welding, piston rod body 91 is coaxially welded with fusion segment 93.

[0003] Friction welding is generally used between piston rod body 91 and threaded rod, and flash will be generated at weld after welding, which must be machined again, so the process is complicated and the cost is high. In order to improve welding quality and save cost, the Chinese utility model patent application document with publication number CN117884748A records a kind of resistance welding clamp and method between shock absorber rod, and the welding clamp includes threaded rod electrode and electrode seat, threaded rod electrode is fixed on electrode seat by bolt, and the bottom of electrode seat is tightened inward horizontally at the connection between electrode seat and threaded rod electrode; threaded rod electrode is provided with recess accommodating threaded rod in the center, and thimble is further provided in the inside of threaded rod electrode, spring is provided in the inside of thimble, and ball body is provided at the top end of spring and abuts against threaded rod. During threaded rod clamping operation, piston rod is fixed first, then threaded rod is inserted into the inner hole of threaded rod electrode and axially pushed, until the shaft shoulder of threaded rod abuts against the lower end surface of threaded rod electrode, to ensure that thimble abuts tightly against threaded rod to position it axially, and piston rod is coaxial with threaded rod. The following deficiencies exist in the use of the device for welding operation:

[0004] 1. It is laborious to align and insert threaded rod into the inner hole of threaded rod electrode due to the small inner hole of threaded rod electrode;

[0005] 2. Thimble is arranged in threaded rod electrode and cannot be seen, which leads to the fact that whether threaded rod is tightly pushed by thimble cannot be confirmed, so threaded rod needs to be axially pushed to the limit position, the amount of action of clamping operation personnel is large, and phenomena such as threaded rod clamping out of position and threaded rod falling off are likely to occur;

[0006] 3. During the installation and removal of the threaded rod, the ejector pin and the tooth tips on the threaded section 92 scrape against each other, which not only easily damages the threads on the threaded rod, but also accelerates the wear of the ejector pin;

[0007] 4. Frequent extension and retraction of the spring inside the ejector pin can easily lead to fatigue failure, causing the ejector pin to fail to properly hold the threaded rod in place, which in turn damages the welding fixture. It needs to be replaced in time.

[0008] 5. In the resistance welding process, both the electrode holder and the threaded rod electrode are made of copper alloy, which has low hardness and rigidity. During the pressure welding process, the threaded rod is compressed and its inner hole is gradually deformed. Excessive deformation of the inner hole of the threaded rod electrode will cause the threaded rod to deviate from the preset axis, affecting the positioning accuracy of the threaded rod and resulting in unqualified welding coaxiality between the threaded rod and the piston rod body 91. In order to ensure welding quality, the threaded rod electrode needs to be frequently observed and replaced, resulting in more equipment downtime, reduced production efficiency, wasted manpower, and increased production costs. Utility Model Content

[0009] The technical problem to be solved by this utility model is to provide a welding fixture for automotive shock absorber piston rods, which improves the coaxiality of the threaded rod and the piston rod body during welding, extends the service life of the welding fixture, and saves production costs.

[0010] The technical solution adopted by this utility model to solve the technical problem is: a welding fixture for a piston rod of an automobile shock absorber, including an electrode made of copper alloy, wherein the electrode includes an electrode body with a cylindrical structure and a protrusion provided on the lower outer side wall of the electrode body;

[0011] The electrode body has an upper cylindrical cavity with an upward opening and a lower cylindrical cavity with a downward opening. The upper cylindrical cavity and the lower cylindrical cavity are arranged adjacent to each other and have a first stepped surface at the adjacent point. The outer diameter of the upper cylindrical cavity is larger than the outer diameter of the lower cylindrical cavity. The upper cylindrical cavity, the lower cylindrical cavity and the electrode body are arranged coaxially. The protrusion has an axially penetrating mounting hole.

[0012] A steel sleeve is fixedly installed inside the upper column cavity, and the inner cavity of the steel sleeve is arranged coaxially adjacent to the lower column cavity to form a threaded rod positioning cavity; it also includes a threaded rod positioning component for axially positioning the threaded rod.

[0013] Furthermore, the protrusion is a limiting ring plate arranged coaxially with the electrode body.

[0014] Furthermore, the limiting ring plate is provided with at least two mounting through holes, and the at least two mounting through holes are evenly distributed along the circumference of the limiting ring plate.

[0015] Further, the upper column cavity cross-section outer contour is matched with the shape and size of the steel sleeve cross-section outer contour, and the steel sleeve outer side wall is matched with the upper column cavity side wall;

[0016] A plurality of radial through holes are arranged on the electrode body side wall and are uniformly distributed along the circumference of the electrode body; a threaded positioning hole coaxial with the radial through hole is arranged on the steel sleeve outer side wall; a fastening screw is arranged in the radial through hole and is screwed with the threaded positioning hole on the steel sleeve.

[0017] Further, the lower column cavity is a stepped hole, and the large hole of the stepped hole is located below the small hole of the stepped hole.

[0018] The inner cavity of the steel sleeve is coaxially arranged adjacent to the small hole of the stepped hole to form a threaded rod positioning cavity; and the large hole of the stepped hole is used for accommodating a fusion section of a threaded rod and has a depth smaller than the axial length of the fusion section.

[0019] Further, the steel sleeve protrudes from the upper end surface of the electrode body.

[0020] Further, the threaded rod positioning member is a magnetic block arranged on the upper portion of the steel sleeve.

[0021] Further, a separation portion is arranged in the cavity of the steel sleeve, an upper accommodating cavity is arranged above the separation portion, a lower accommodating cavity is arranged below the separation portion, the magnetic block is arranged in the upper accommodating cavity and is adsorbed on the separation portion; and the lower accommodating cavity and the lower column cavity are arranged adjacent to each other to form the threaded rod positioning cavity.

[0022] Further, the inner cavity of the steel sleeve is a stepped hole structure, and the stepped surface of the inner cavity of the steel sleeve is the separation portion.

[0023] Compared with the prior art, the automobile shock absorber piston rod welding tool has the advantages that the steel sleeve inner cavity and the lower column cavity of the electrode body are arranged adjacent to each other to form a threaded rod positioning cavity, the rigidity and strength of the upper portion side wall of the threaded rod positioning cavity are improved, the inner wall of the steel sleeve is prevented from being deformed or damaged during the piston rod pressurizing welding process, the service life of the entire welding tool is prolonged, the production efficiency is improved, and the production cost is saved; the influence of the deformation of the copper alloy electrode on the threaded rod positioning precision is reduced, the radial positioning precision of the threaded rod is improved, the welding coaxiality of the threaded rod and the electrode body is ensured, and the welding quality of the piston rod is improved. The threaded rod positioning member is set as a magnetic block to assist the operator to quickly and labor-savingly complete the disassembly and assembly of the piston rod, the work efficiency is improved, the manpower is saved, the welding operation quality is improved, the service life of the welding tool is prolonged, and the production cost is further saved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic view of the structure of a piston rod in the background art;

[0025] Figure 2 is a schematic view of the axial sectional structure of a welding tool in the present application;

[0026] Figure 3 is a schematic view of the assembly structure of the welding tool and the electrode holder in the present application;

[0027] Figure 4 is a schematic view of the sectional structure of the welding tool in the present application during welding operation;

[0028] Figure 5 is a schematic view of the axial sectional structure of an electrode in the present application; Figure 2

[0029] Figure 6 is a schematic view of the axial sectional structure of a steel sleeve in the present application;

[0030] Reference signs: 1-electrode; 11-electrode body; 12-protruding part; 2-steel sleeve; 21-upper cavity; 22-lower cavity; 23-separation part; 3-magnetic block; 41-upper column cavity; 42-lower column cavity; 5-fastening screw; 8-electrode holder; 81-mounting groove; 91-piston rod body; 92-threaded section; 93-fused section. DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the drawings and examples. The examples described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] As shown in the accompanying drawings Figures 1-6 ​As shown, a kind of automobile shock absorber piston rod welding tool includes copper alloy material electrode 1, the electrode 1 includes the electrode body 11 of cylindrical structure and the convex part 12 being arranged on the lower outer lateral wall of the electrode body 11;The electrode body 11 is equipped with the upper column cavity 41 of opening upwards and the lower column cavity 42 of opening downwards, the upper column cavity 41, the lower column cavity 42 are arranged adjacent and have first step surface at adjacent place, the outer diameter of the upper column cavity 41 is greater than the outer diameter of the lower column cavity 42;The upper column cavity 41, the lower column cavity 42 and the electrode body 11 are coaxially arranged, the convex part 12 is equipped with the installation through-hole being axially penetrated;The steel sleeve 2 is fixedly arranged in the upper column cavity 41, and the inner cavity of the steel sleeve 2 is coaxially arranged with the lower column cavity 42 to form threaded rod positioning cavity;It also includes threaded rod positioning member for the axial positioning of threaded rod.The step surface between the upper column cavity 41 and the lower column cavity 42 is perpendicular to the axis of the electrode 1 and supports the steel sleeve 2 upward to limit the axial position of the steel sleeve 2.The material of the electrode body 11 is generally copper alloy.The axial size of threaded rod positioning cavity can be changed by changing the length of steel sleeve 2 and lower column cavity 42, to further meet the welding operation requirement of threaded rod with different length threaded section 92.

[0033] When using, the upper part of the electrode body 11 of the welding tool of the utility model and the steel sleeve 2 are all inserted in the installation slot of the electrode holder 8, the side wall of the installation slot of the electrode holder 8 is combined with the outer side of the electrode body 11 to position the electrode 1 radially, the convex part 12 is located outside the installation slot of the electrode holder 8, the electrode 1 is installed on the electrode holder 8 by using bolt to pass through the installation through-hole of the convex part 12 to make the convex part 12 combined with the lower end surface of the electrode holder 8, and the fixation assembly of the electrode 1 and the whole welding tool is completed.

[0034] During the welding operation, the threaded segment 92 on the threaded rod is completely located in the threaded rod positioning cavity, the side wall of the threaded rod positioning cavity is in close contact with the outer side wall of the threaded segment 92 to radially position the threaded rod, the shaft shoulder between the threaded segment 92 and the fusion segment 93 is in close contact with the lower end surface of the electrode body 11, and the threaded rod positioning member positions and installs the threaded rod in the threaded rod positioning cavity. The piston rod body 91 is clamped below the threaded rod and coaxial with the threaded rod, the electrode holder 8 drives the welding fixture and the threaded rod to move synchronously downward, the fusion segment 93 is in close contact with the welding protrusion of the piston rod body 91, and then the electrode holder 8 starts to weld after being electrified. During the resistance welding and pressurizing process, the threaded rod is pressed and extrudes the side wall of the threaded rod positioning cavity, that is, the threaded rod extrudes the side wall of the lower column cavity 42 in the electrode body 11 and the inner wall of the steel sleeve 2. Because the rigidity and hardness of the steel sleeve 2 are relatively large, even if the side wall of the lower column cavity 42 in the electrode body 11 is deformed by being extruded by the threaded rod, the steel sleeve 2 will not be pressed and deformed, the inner wall of the steel sleeve 2 still supports the side wall of the threaded rod to radially position it, avoids the threaded rod from deviating from the preset position to affect the positioning accuracy, guarantees the coaxiality of the threaded rod and the piston rod body 91 during welding, guarantees the welding accuracy of the threaded rod, and improves the welding quality of the piston rod; at the same time, the welding tool will not frequently fail, prolongs the service life of the welding tool, improves the production efficiency, and saves the production cost.

[0035] The electrode 1 is used for accurately positioning and installing the entire welding fixture on the electrode holder 8, the outer side wall thereof is in contact with the electrode holder 8, the inner side wall thereof is in contact with the threaded rod, the electrode holder 8 and the threaded rod are guaranteed to be in electrical contact, and the necessary conditions for resistance welding operation are met. The side wall of the installation groove of the electrode holder 8 is in close contact with the outer side wall of the electrode body 11 to radially position the electrode 1, and then the electrode body 1, the steel sleeve 2, the threaded rod positioning cavity and the piston rod body 91 are radially positioned, and the threaded rod in the threaded rod positioning cavity is guaranteed to be coaxial with the piston rod body 91. The protruding part 12 is used for fixedly installing the electrode 1 on the electrode holder 8 and abutting against the lower end surface of the electrode holder 8 to axially position the electrode 1. The protruding part 12 can be a single limiting plate or a plurality of limiting plates uniformly distributed along the circumference of the electrode body 11, and preferably, the protruding part 12 is a limiting ring plate coaxially arranged with the electrode body 11, which is simple in structure and convenient to manufacture. One or more installation through holes can be arranged on the protruding part 12, and as a further preferred, at least two installation through holes are arranged on the limiting ring plate, and the at least two installation through holes are uniformly distributed along the circumference of the limiting ring plate, thereby improving the installation reliability of the welding tool.

[0036] The upper column cavity 41 is used for assembling the steel sleeve 2 and radially positioning it. The steel sleeve 2 can be directly welded or threadedly connected in the upper column cavity 41, or can be mounted in the upper column cavity 41 through connecting members such as top wires, elastic pins, etc. Considering that the electrode body 11 is made of copper alloy material, which has small hardness and is easy to deform, it is easy to slip when threadedly connected with the steel sleeve 2 or commonly used steel screws. Specifically, the upper column cavity 41 has a cross-sectional outer contour which is matched in shape and size with a cross-sectional outer contour of the steel sleeve 2, and the outer side surface of the steel sleeve 2 is fitted with the side wall of the upper column cavity 41; a plurality of radial through holes are arranged on the side wall of the electrode body 11, and the plurality of radial through holes are uniformly distributed along the circumference of the electrode body 11; a threaded positioning hole coaxial with the radial through hole is arranged on the outer side wall of the steel sleeve 2, and a fastening screw 5 is arranged in the radial through hole, and the fastening screw 5 is threadedly connected with the threaded positioning hole on the steel sleeve 2. The outer end surface of the fastening screw 5 is located in the radial through hole of the electrode body 11, and the threaded positioning hole on the steel sleeve 2 cannot penetrate the side wall of the steel sleeve 2, so as to avoid damaging the threads on the threaded segment 92. The shape and size of the cross-sectional outer contour of the upper column cavity 41 matched with the cross-sectional outer contour of the steel sleeve 2 refer to that the outer side wall of the upper column cavity 41 is matched with the side wall of the steel sleeve 2 to radially position the steel sleeve 2. The steel sleeve 2 is axially positioned on the electrode body 11 through the fastening screw 5, and the steel sleeve 2 is assembled and disassembled through the fastening screw 5, which is more stable and reliable.

[0037] The lower column cavity 42 is mainly used for accommodating the threaded segment 92 of the threaded rod, and the side wall of the lower column cavity 42 is fitted with the outer side wall of the threaded segment 92 to radially limit the threaded rod. Preferably, the lower column cavity 42 is a stepped hole, the large hole of the stepped hole is located below the small hole of the stepped hole; the inner cavity of the steel sleeve 2 is arranged coaxially adjacent to the small hole of the stepped hole to form a threaded rod positioning cavity; and the large hole of the stepped hole is used for accommodating the fusion segment 93 of the threaded rod and has a depth smaller than the axial length of the fusion segment 93. When clamping the threaded rod, the large hole of the stepped hole is used for guiding the threaded rod into the threaded rod positioning cavity, thereby assisting the operator to quickly and labor-savingly complete the clamping of the threaded rod. When welding, the fusion segment 93 of the threaded rod is located in the large hole of the lower column cavity 42, and the welding end surface thereof protrudes downward from the lower end surface of the electrode 1, the shaft shoulder between the threaded segment 92 and the fusion segment 93 abuts against the stepped surface of the lower column cavity 42, thereby ensuring that the threaded rod is installed in place, the threaded segment 92 is completely located in the threaded rod positioning cavity, and the stepped surface conducts electricity while providing axial pressure for the threaded rod during the resistance welding and pressing process.

[0038] The steel sleeve 2 is used for keeping the threaded rod radially positioned. The steel sleeve 2 can be completely located in the upper column cavity 41, or can be partially located in the upper column cavity 41. In order to facilitate the assembly and disassembly of the steel sleeve 2, as a further preferred, the steel sleeve 2 protrudes from the upper end surface of the electrode body 11.

[0039] The threaded rod positioning member has various structural forms, which can be a top pin arranged on the inner wall of the electrode body 11, or an elastic ejector pin, or a structure arranged on the lower end face of the electrode 1 or a ring-shaped baffle, etc., but these structures all need to ensure that the threaded rod is installed in place when clamping the threaded rod, which not only easily causes the threaded rod to fall off, but also has more clamping operation procedures and consumes more manpower. Preferably, the threaded rod positioning member is a magnetic block 3 arranged on the upper portion of the steel sleeve 2, which is simple in structure and convenient to process and assemble. When clamping the threaded rod, only the upper end of the threaded rod is inserted into the lower column cavity 42 to make the magnetic block 3 attract the threaded rod to move upward along the axial direction until the shaft shoulder between the threaded segment 92 and the fusion segment 93 abuts against the electrode body 11 to achieve axial positioning of the threaded rod. In this process, the magnetic attraction force of the magnetic block 3 assists the operator to quickly and labor-savingly complete the clamping of the threaded rod; after welding is completed, the piston rod and the piston rod body 91 are welded into one body, and the electrode holder 8 drives the welding fixture to move upward to make the piston rod come out. The threaded rod is quickly and labor-savingly disassembled and assembled, the work efficiency is improved, and the manpower is saved. In addition, the magnetic block 3 is generally made of a permanent magnet, which does not frictionally abut against the side surface of the threaded rod, avoids the threaded segment 92 from being scratched, improves the yield of the welding operation, and prolongs the service life of the entire welding tool.

[0040] The magnetic block 3 can be installed in the cavity of the steel sleeve 2 or outside the cavity of the steel sleeve 2. The magnetic block 3 can be directly bonded or adsorbed on the steel sleeve 2 or be installed on the steel sleeve 2 in a threaded connection, bonding or bolt connection manner. Preferably, the cavity of the steel sleeve 2 is provided with a separation portion 23, an upper cavity 21 is arranged above the separation portion 23, a lower cavity 22 is arranged below the separation portion 23, the magnetic block 3 is located in the upper cavity 21 and is adsorbed on the separation portion 23, and the lower cavity 22 and the lower column cavity 42 are arranged in an upper and lower adjacent mode to form a threaded rod positioning cavity. The magnetic block 3 is prevented from deviating from the predetermined position or falling off, and the clamping reliability of the welding fixture is improved. The separation portion 23 is used for installing the magnetic block 3 to axially position the magnetic block 3. The separation portion 23 can be a ring plate structure, a stepped structure or other structures protruding from the inner wall of the steel sleeve 2. Preferably, the inner cavity of the steel sleeve 2 is a stepped hole structure, and the stepped surface of the inner cavity of the steel sleeve 2 is the separation portion 23. The steel sleeve 2 is simple in structure and convenient to process and manufacture.

[0041] In the utility model, the "upper", "lower", "top" and "bottom" indicating positions are relative positional relationships and cannot be understood as limitations on specific directions. The embodiments of the specific embodiments are preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered within the protection scope of the utility model.

Claims

1. A piston rod welding tool for an automobile shock absorber, comprising an electrode (1) made of a copper alloy material, characterized in that: The electrode (1) comprises an electrode body (11) in a cylindrical structure and a protruding part (12) arranged on the lower outer wall of the electrode body (11); The electrode body (11) is provided with an upper column cavity (41) with an upward opening and a lower column cavity (42) with a downward opening, the upper column cavity (41) and the lower column cavity (42) are arranged adjacently in an up-down direction and have a first step surface at the adjacent position, the outer diameter of the upper column cavity (41) is larger than that of the lower column cavity (42); the upper column cavity (41), the lower column cavity (42) and the electrode body (11) are coaxially arranged, and the protruding part (12) is provided with an axial through mounting through hole; A steel sleeve (2) is fixedly arranged in the upper column cavity (41), the inner cavity of the steel sleeve (2) and the lower column cavity (42) are coaxially and adjacently arranged to form a threaded rod positioning cavity; and a threaded rod positioning member for axially positioning the threaded rod is further included.

2. The automotive shock absorber piston rod welding fixture of claim 1, wherein: The protruding part (12) is a limiting ring plate coaxially arranged with the electrode body.

3. The automotive shock absorber piston rod welding fixture of claim 2, wherein: The limiting ring plate is provided with at least two mounting through holes, and the at least two mounting through holes are uniformly distributed along the circumference of the limiting ring plate.

4. The automotive shock absorber piston rod welding fixture of claim 1, wherein: The upper column cavity (41) is adapted in shape and size to the cross-sectional outer contour of the steel sleeve (2), and the outer side surface of the steel sleeve (2) is fitted with the side wall of the upper column cavity (41); The side wall of the electrode body (11) is provided with a plurality of radial through holes, and the plurality of radial through holes are uniformly distributed along the circumference of the electrode body (11); the outer side wall of the steel sleeve (2) is provided with a threaded positioning hole coaxial with the radial through hole, and a fastening screw (5) is arranged in the radial through hole and is in threaded connection with the threaded positioning hole on the steel sleeve (2).

5. The automotive shock absorber piston rod welding fixture of claim 1, wherein: The lower column cavity (42) is a stepped hole, and the large hole of the stepped hole is located below the small hole of the stepped hole; The inner cavity of the steel sleeve (2) and the small hole of the stepped hole are coaxially and adjacently arranged to form a threaded rod positioning cavity; and the large hole of the stepped hole is used for accommodating a fusion section (93) of a threaded rod and has a depth smaller than the axial length of the fusion section (93).

6. The automotive shock absorber piston rod welding fixture of claim 4, wherein: The steel sleeve (2) protrudes from the upper end surface of the electrode body (11).

7. The automotive shock absorber piston rod welding fixture of any one of claims 1-6, wherein: The threaded rod positioning member is a magnetic attraction block (3) arranged on the upper part of the steel sleeve (2).

8. The automotive shock absorber piston rod welding fixture of claim 7, wherein: The cavity of the steel sleeve (2) is provided with a separation part (23), an upper accommodating cavity (21) is arranged above the separation part, and a lower accommodating cavity (22) is arranged below the separation part, the magnetic attraction block (3) is located in the upper accommodating cavity (21) and is adsorbed on the separation part (23); the lower accommodating cavity (22) and the lower column cavity (42) are adjacently arranged in an up-down direction to form the threaded rod positioning cavity.

9. The automotive shock absorber piston rod welding fixture of claim 8, wherein: The inner cavity of the steel sleeve (2) is a stepped hole structure, and the step surface of the inner cavity of the steel sleeve (2) is the separation part (23).

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