A swing arm welding tool for new energy automobile parts and a use method thereof

Abstract

The present application relates to the technical field of automobile parts welding, especially to a swing arm welding tool for new energy automobile parts and a use method thereof; comprising a welding platform, a bearing platform, a pressing mechanism and the like; the bearing platform is provided with a stepped positioning assembly, which comprises a bottom pin with a larger diameter and a coaxial tubular positioning pin body; the pressing mechanism comprises a bearing plate driven by a hydraulic machine, the bottom of the bearing plate is provided with a spring pin with a pressing plate and a ejector pin; the tubular positioning pin body is provided with a sliding hole in the circumferential direction, and a slider capable of moving radially is arranged in the sliding hole; when the ejector pin is inserted, the slider is pushed to expand obliquely outward to abut against the inner wall of the positioning hole of the upper shell to form horizontal constraint, and the pressing plate is pressed downward to form vertical constraint; the gravity of the slider is reset to the state of being flush with the pipe wall by using the inclined guide surface, and the stepped positioning pin structure is combined to solve the problems of assembly difficulty and positioning misalignment caused by deformation of the positioning pin of the traditional tool, and the welding precision of the thin-walled swing arm is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts welding technology, and in particular to a swing arm welding fixture and its application method for new energy vehicle parts. Background Technology

[0002] The rocker arm welding fixture, a key component of the chassis of new energy vehicles, is mainly used to achieve precise positioning and efficient welding of the thin-walled shell structure for lightweight design. This fixture must ensure that the symmetrically separated upper and lower shells remain strictly aligned during the welding process, so that the resulting triangular hollow rocker arm structure meets the geometric accuracy and strength requirements of the vehicle's suspension system.

[0003] Current mainstream processes rely on creating several positioning holes at corresponding positions on the upper and lower housings of the control arm, and securing it by simultaneously passing an integral positioning pin through these holes. This structure requires the positioning pin diameter to be identical to the positioning hole diameter for an interference fit. However, long-term use on actual production lines has revealed significant drawbacks: First, the slender positioning pin is prone to slight, almost imperceptible twisting deformation under frequent insertion and removal and welding vibrations. This forces operators to repeatedly adjust the housing posture to barely insert the pin during assembly, severely slowing down production. More importantly, when the microscopic burrs remaining at the edge of the stamped positioning hole interact with the deformed positioning pin surface, it not only exacerbates pin wear, creating a vicious cycle, but also subjects the housing to abnormal stress, causing localized deformation. Even if the operator manages to complete the assembly with external force, the twisted positioning pin can no longer guarantee the theoretical coaxial relationship between the upper and lower housings, ultimately leading to misalignment at the welding positions of the three critical seams. This welding defect caused by tooling reliability is difficult to detect in subsequent final assembly stages, but it significantly reduces the fatigue life of the control arm under complex road conditions, becoming a hidden pain point in the quality control of new energy vehicle chassis.

[0004] Therefore, this application provides a swing arm welding fixture and a method for using it for new energy vehicle components, in order to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a welding fixture and method for swing arm components in new energy vehicles, which solves the problems of difficult assembly of upper and lower housings, inaccurate positioning, and welding misalignment caused by deformation of existing positioning pins due to long-term use and burr wear of positioning holes.

[0006] To solve the above-mentioned technical problems, the present invention provides a swing arm welding fixture for new energy vehicle parts. The swing arm is welded from an upper shell and a lower shell, and includes a welding platform. The top of the welding platform is provided with a bearing platform through a support column for placing the lower shell to be welded.

[0007] A positioning component is provided on the bearing platform. The positioning component includes a bottom pin fixed to the bearing platform and a tubular positioning pin body coaxially fixed to the top of the bottom pin. The outer diameter of the bottom pin is larger than the outer diameter of the tubular positioning pin body. The bottom pin is used to position the positioning hole of the lower housing.

[0008] A clamping mechanism is set above the welding platform. The clamping mechanism includes a hydraulic press. A horizontal receiving plate is connected below the hydraulic press. Several spring pins that move up and down relative to the receiving plate are set at the bottom of the receiving plate. A pressure plate is set at the bottom of one spring pin, and pins with corresponding positioning holes are set vertically at the bottom of the other spring pins.

[0009] Several sliding holes are opened circumferentially on the tube wall of the tubular positioning pin body, and a slider that can move radially along the sliding hole is set in each sliding hole; the ejector pin is inserted into the tubular positioning pin body in the vertical direction; when the ejector pin moves downward and inserts into the tubular positioning pin body, the ejector pin pushes the slider to move radially outward, so that the slider protrudes from the outer wall of the tubular positioning pin body and abuts against the inner wall of the positioning hole of the upper housing; at the same time, the pressure plate moves downward and presses the top of the upper housing.

[0010] A further improvement of the technical solution of the present invention is that the inner edge of the sliding hole is higher than the part near the outer side of the tubular positioning pin body, forming a sloping guide surface that slopes from the outside to the inside and from the top to the bottom, which facilitates the slider to slide and reset inward along the sloping guide surface under the action of gravity.

[0011] A further improvement of the technical solution of the present invention is that: the slider is a parallelogram-like body, the outer side of the slider has an arc-shaped contact surface that matches the inner wall of the positioning hole of the upper shell, and the inner side of the slider has a mating surface that matches the outer peripheral surface of the ejector pin.

[0012] A further improvement of the technical solution of the present invention is that: the slider is placed in the sliding hole, part of its volume protrudes outside the tube wall of the tubular positioning pin body, and part of its volume is located inside the tube wall of the tubular positioning pin body, and the center of gravity of the slider is located inside the tube wall of the tubular positioning pin body.

[0013] A further improvement of the technical solution of the present invention is that: after the ejector pin is completely withdrawn from the tubular positioning pin body, the slider slides down along the inclined guide surface to the return position under the action of gravity. At the return position, the outer side of the slider is flush with the outer side of the tubular positioning pin body wall.

[0014] A further improvement of the technical solution of the present invention is that the inclination angle of the ramp guide surface is 45-60°.

[0015] A further improvement to the technical solution of the present invention is that two sliders are arranged in close contact with each other in each sliding hole.

[0016] A further improvement of the technical solution of the present invention is that the shape of the bearing platform is adapted to the overall contour of the swing arm, and the projected area of ​​the bearing platform is smaller than the projected area of ​​the swing arm, so that when the swing arm is placed on the bearing platform, the weld seam between its upper shell and lower shell is completely exposed outside the bearing platform.

[0017] A method for using a swing arm welding fixture for new energy vehicle components includes the following steps:

[0018] S1: Place the lower housing on the support platform, so that the positioning hole of the lower housing fits onto the bottom pin;

[0019] S2: Place the upper housing on the lower housing, aligning the positioning holes of the upper housing with the positioning holes of the lower housing and aligning them with the tubular positioning pin body.

[0020] S3: Control the pressing mechanism to move downwards, so that the ejector pin is inserted into the cavity of the tubular positioning pin body, and at the same time, the pressure plate presses down on the top of the upper housing;

[0021] S4: During the insertion process, the ejector pin pushes the slider to slide outward radially along the inclined guide surface of the sliding hole, so that the slider protrudes from the outer wall of the tubular positioning pin body and tightly presses against the inner wall of the positioning hole of the upper housing, while the pressure plate presses the top of the upper housing.

[0022] S5: With the slider pressing against the inner wall of the upper housing positioning hole to achieve horizontal locking and positioning, and the upper and lower housings being vertically pressed by the pressure plate, weld the edge seam between the upper and lower housings.

[0023] S6: After welding is completed, control the clamping mechanism to move upward, the ejector pin exits the tubular positioning pin body, the slider loses the thrust of the ejector pin and slides down along the inclined guide surface to the return position under the action of gravity. At this return position, the outer side of the slider is flush with the outer side of the tubular positioning pin body wall, which does not affect the next insertion of the positioning pin into the upper housing; at the same time, the pressure plate disengages from the upper housing.

[0024] S7: Remove the welded swing arm.

[0025] A further improvement of the technical solution of the present invention is that: in step S2, there is a gap between the inner wall of the positioning hole of the upper housing and the slider that has not yet protruded outward; in step S4, the slider protrudes outward and abuts against the inner wall of the positioning hole of the upper housing to form a horizontal constraint, and the pressure plate presses the top of the upper housing to form a vertical constraint.

[0026] By adopting the above technical solution, the present invention has the following beneficial effects:

[0027] 1. This invention provides a welding fixture for swing arms of new energy vehicle components. This fixture, through a stepped positioning pin structure—specifically, a design combining a bottom pin and a tubular positioning pin body coaxially arranged with a radially adjustable slider—solves the assembly difficulties caused by the easy deformation and wear of traditional integral positioning pins. After the bottom pin accurately positions the lower housing, the upper housing can easily fit the smaller-diameter tubular positioning pin body. During welding, the ejector pin inserts and pushes the slider radially to expand and press against the inner wall of the upper housing, avoiding jamming caused by burrs or deformation, and ensuring zero positioning deviation through an adaptive locking mechanism, significantly improving assembly efficiency and yield.

[0028] 2. This invention provides a swing arm welding fixture for new energy vehicle components. This fixture, through a ramp guide surface structure and the synergistic effect of a centrally located slider, achieves long-life, maintenance-free operation. After the ejector pin retracts, the slider automatically slides down the ramp under gravity to a state flush with the outer surface of the tube wall, completely avoiding the problem of manual cleaning and resetting of traditional locating pins. Furthermore, during the slider's movement, the arc-shaped contact surface scrapes away burrs from the inner wall of the locating hole, thereby improving workpiece accuracy and forming a self-maintenance mechanism.

[0029] 3. This invention provides a welding fixture for swing arms of new energy vehicle components. This fixture utilizes a split-drive design of spring pins in the clamping mechanism, with the pressure plate and ejector pin independently linked, to achieve precise, graded control of the welding constraint force. The pressure plate provides a vertically downward, uniformly distributed pressure to fix the overall position of the upper housing, while the ejector pin drives the slider to generate radial expansion force and a small axial preload. This dual constraint mechanism effectively suppresses the risk of misalignment caused by welding thermal deformation, ensuring consistent penetration depth across the three seams.

[0030] 4. This invention provides a welding fixture for swing arms of new energy vehicle components. This fixture solves the industry problem of inaccurate positioning during welding of large thin-walled shells by forming a three-dimensional constraint network through a series of evenly distributed sliding holes around the circumference of the tubular positioning pin body, with two sliders tightly attached vertically within each hole. Driven by a push pin, the sliders move synchronously obliquely upwards to abut against the inner wall of the positioning hole. First, the vertically attached sliders create a continuous pressure band along the height of the positioning hole. The axial force generated by the superimposed oblique movement forms a strong downward pre-tightening force, effectively suppressing shell separation deformation caused by high welding temperatures. Second, the symmetrical layout of several contact points covers the entire circumference of the positioning hole, transforming the concentrated stress of traditional single-point support into a uniformly distributed load, preventing local crushing of thin-walled parts while improving positioning accuracy. More importantly, the adjacent sliders form a natural couple constraint mechanism. When the swing arm is subjected to asymmetrical welding stress, the synergistic effect of the upper and lower sliders can automatically compensate for the off-center load moment, ensuring the workpiece maintains a zero-drift stable state under vibration conditions, providing reliable assurance for millimeter-level welding of large components in new energy chassis.

[0031] 5. This invention provides a swing arm welding fixture for new energy vehicle components. This fixture overcomes the technical bottleneck of welding operability through an optimized structure where the profile of the supporting platform matches the swing arm but the projected area is reduced. The edges of the triangular supporting platform maintain a safe distance from the swing arm welding seam, ensuring that all three seams are fully exposed to the operator's field of vision. This allows the welding torch to operate without blind spots while preventing the platform from being contaminated by welding slag spatter, thus balancing positioning accuracy and welding process freedom. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a swing arm welding fixture used for new energy vehicle parts.

[0034] Figure 2 This is a schematic diagram of a swing arm welding fixture used for new energy vehicle parts.

[0035] Figure 3 A front view of a swing arm welding fixture used for new energy vehicle parts;

[0036] Figure 4 This is a schematic diagram of the installation of the swing arm of the present invention;

[0037] Figure 5 This is a schematic diagram of the installation of the swing arm and welding platform of the present invention;

[0038] Figure 6 This is a schematic diagram of the swing arm structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of the support platform and positioning pin of the present invention;

[0040] Figure 8 for Figure 5 A sectional view;

[0041] Figure 9 This is a schematic diagram of the positioning pin and ejector pin of the present invention;

[0042] Figure 10 for Figure 9 The main view;

[0043] Figure 11 for Figure 9 A sectional view;

[0044] Figure 12 This is a schematic diagram of the positioning pin and slider of the present invention.

[0045] Reference numerals: 1. Swing arm; 2. Upper housing; 3. Lower housing; 4. Welding platform; 5. Bearing platform; 6. Support column; 7. Hydraulic press; 8. Receiving plate; 9. Spring pin; 10. Pressure plate; 11. Ejector pin; 12. Positioning pin; 13. Positioning hole; 14. Bottom pin; 15. Sliding hole; 16. Slider; 17. Contact surface; 18. Mating surface. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] The present invention will be further explained below with reference to specific embodiments.

[0050] like Figures 1-12As shown, this embodiment provides a fixture for welding swing arms in new energy vehicles. The swing arm 1 is formed by welding an upper shell 2 and a lower shell 3 to create a hollow triangular structure. The fixture includes a welding platform 4, the top of which is fixed to a support platform 5 by multiple support columns 6 for stable placement of the lower shell 3. The support platform 5 is designed as a triangle matching the contour of the swing arm 1, but its projected area is slightly smaller than that of the swing arm 1. This ensures that after the swing arm 1 is placed, the three seams to be welded between the upper shell 2 and the lower shell 3 are completely exposed outside the edge of the support platform 5, providing unobstructed operating space for the welding torch and preventing welding spatter from contaminating the platform. The support platform 5 is equipped with a positioning component, which consists of a fixed bottom pin 14 and a tubular positioning pin body 12 coaxially fixed to its top. The diameter of the bottom pin 14 is larger than the diameter of the tubular positioning pin body 12, forming a stepped shaft structure. The height of the bottom pin 14 is consistent with the thickness of the positioning hole 13 in the lower housing 3, and its outer diameter is precisely matched with the positioning hole 13 in the lower housing 3 to achieve an interference fit. The short and thick column structure resists deformation after long-term use. The initial outer diameter of the tubular positioning pin body 12 is only two-thirds of the diameter of the positioning hole 13 in the upper housing 2, leaving an assembly gap to avoid burr interference.

[0051] like Figure 1 , Figure 2 , Figures 7-12 As shown, in this embodiment, a clamping mechanism is provided above the welding platform 4, including a hydraulic press 7, a horizontal receiving plate 8, and multiple spring pins 9 connected to the bottom of the receiving plate 8. A pressure plate 10 is installed at the bottom of one of the spring pins 9, while ejector pins 11 are vertically installed at the bottom of the remaining spring pins 9. The spring pins 9 allow each clamping unit to independently fine-tune its stroke to adapt to the shell thickness tolerance. The tubular positioning pin body 12 has four circumferentially distributed sliding holes 15 on its tube wall. Two parallelogram-like sliders 16 are tightly fitted together vertically within each sliding hole 15. The outer surface of the slider 16 is machined into an arc-shaped contact surface 17 with the curvature of the inner wall of the positioning hole 13, and the inner surface is an inclined mating surface 18 adapted to the taper of the ejector pin 11. After installation, approximately one-fifth of the slider 16's volume protrudes outside the tube wall, while four-fifths of its volume and center of gravity are located inside the tube wall, ensuring reliable resetting. The edge of the sliding hole 15 is designed as a sloping guide surface with a higher outer edge and a lower inner edge. The tilt angle is controlled between 45-60°. This angle range has been mechanically verified to balance the sliding resistance and reset efficiency of the slider 16.

[0052] like Figures 5-12As shown, in this embodiment, when the clamping mechanism descends, the ejector pin 11 inserts into the tubular positioning pin body 12, and its conical end pushes the inner inclined surfaces of all sliders 16, forcing the sliders 16 to slide obliquely upward along the inclined guide surface. At this time, the sliders 16 simultaneously generate radial expansion motion and axial displacement: the radial displacement causes the arc-shaped contact surface 17 to tightly press against the inner wall of the positioning hole 13 of the upper housing 2, eliminating the initial gap and forming a horizontal constraint; the axial displacement, through the component force generated by the oblique upward movement of the sliders 16, pulls the upper housing 2 downward, assisting the pressure plate 10 in achieving vertical clamping. The pressure plate 10 simultaneously presses down on the top of the upper housing 2, working in conjunction with the axial component force of the sliders 16 to completely suppress the risk of housing separation caused by welding thermal deformation. The eight sliders 16 form four sets of symmetrical support units on the inner wall of the positioning hole 13, and the upper and lower sliders 16 closely attached together form a local rigid ring, effectively resisting the eccentric load moment caused by welding vibration. After welding is completed, the clamping mechanism moves upward, the ejector pin 11 exits the cavity, and the slider 16 slides down the slope to reset under the action of gravity. Its outer side is flush with the outer side of the tubular positioning pin body 12, ensuring that the upper shell 2 can be fitted in without resistance during the next assembly.

[0053] This invention also provides a method for using a swing arm welding fixture for new energy vehicle components, comprising the following steps:

[0054] Step S1: The lower housing 3 is placed on the support platform 5, and the positioning hole 13 is fitted into the bottom pin 14. The diameter matching of the bottom pin 14 is used to achieve precise positioning of the lower housing 3 at the millimeter level.

[0055] Step S2: The upper housing 2 covers the lower housing 3, with an initial gap of 1.5-3mm between its positioning hole 13 and the tubular positioning pin body 12 to avoid burrs from getting stuck;

[0056] Step S3: Start the hydraulic press 7 to drive the receiving plate 8 downward, and the ejector pin 11 and the pressure plate 10 move synchronously;

[0057] Step S4: During the insertion of the ejector pin 11, the slider 16 is pushed to expand outward at an angle, and the eight-point contact surface 17 evenly locks the positioning hole 13 of the upper housing 2. At the same time, the pressure plate 10 applies vertical pressure to form a horizontal-vertical bidirectional constraint.

[0058] Step S5: Weld the three side seams under double constraints, and use the axial preload of slider 16 to compensate for the material expansion caused by high temperature;

[0059] Step S6: After the hydraulic press 7 returns, the slider 16 automatically resets to a state flush with the pipe wall, realizing the tooling self-maintenance;

[0060] Step S7: Take out the finished swing arm 1. There is no forced assembly action throughout the process.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding fixture for a swing arm used in new energy vehicle components, wherein the swing arm (1) is welded from an upper housing (2) and a lower housing (3), characterized in that, Includes a welding platform (4), and a bearing platform (5) is set on the top of the welding platform (4) via a support column (6) for placing the lower shell (3) to be welded; A positioning component is provided on the bearing platform (5). The positioning component includes a bottom pin (14) fixed to the bearing platform (5) and a tubular positioning pin body (12) coaxially fixed to the top of the bottom pin (14). The outer diameter of the bottom pin (14) is larger than the outer diameter of the tubular positioning pin body (12). The bottom pin (14) is used to position the positioning hole (13) of the lower housing (3). A clamping mechanism is set above the welding platform (4). The clamping mechanism includes a hydraulic press (7). A horizontal receiving plate (8) is connected below the hydraulic press (7). Several spring pins (9) that move up and down relative to the receiving plate (8) are set at the bottom of the receiving plate (8). A pressure plate (10) is set at the bottom of one spring pin (9). The bottom of the other spring pins (9) is vertically set with pins (11) corresponding to the positioning holes (13). A number of sliding holes (15) are opened circumferentially on the tube wall of the tubular positioning pin body (12). A slider (16) that can move radially along the sliding hole (15) is provided in each sliding hole (15). The ejector pin (11) is inserted into the tubular positioning pin body (12) in the vertical direction. When the ejector pin (11) moves downward and inserts into the tubular positioning pin body (12), the ejector pin (11) pushes the slider (16) to move radially outward, so that the slider (16) protrudes out of the outer wall of the tubular positioning pin body (12) and abuts against the inner wall of the positioning hole (13) of the upper housing (2). At the same time, the pressure plate (10) moves downward and presses the top of the upper housing (2).

2. The swing arm welding fixture for new energy vehicle components according to claim 1, characterized in that, The inner edge of the sliding hole (15) near the outer side of the tubular positioning pin body (12) is higher than the part near the inner side of the tubular positioning pin body (12), forming a sloping guide surface that slopes from the outside to the inside and from the top to the bottom, so that the slider (16) can slide and reset inward along the sloping guide surface under the action of gravity.

3. The swing arm welding fixture for new energy vehicle components according to claim 2, characterized in that, The slider (16) is a parallelogram-like body. The outer side of the slider (16) has an arc-shaped contact surface (17) that is adapted to the inner wall of the positioning hole (13) of the upper shell (2). The inner side of the slider (16) has a mating surface (18) that is adapted to the outer peripheral surface of the ejector pin (11).

4. The swing arm welding fixture for new energy vehicle components according to claim 3, characterized in that, The slider (16) is placed inside the sliding hole (15). Part of its volume protrudes outside the tube wall of the tubular positioning pin body (12), and part of its volume is located inside the tube wall of the tubular positioning pin body (12). The center of gravity of the slider (16) is located inside the tube wall of the tubular positioning pin body (12).

5. A swing arm welding fixture for new energy vehicle components according to claim 4, characterized in that, When the ejector pin (11) is completely withdrawn from the tubular positioning pin body (12), the slider (16) slides down the ramp guide surface under the action of gravity to the return position. At the return position, the outer side of the slider (16) is flush with the outer side of the tubular positioning pin body (12).

6. A swing arm welding fixture for new energy vehicle components according to claim 2, characterized in that, The inclination angle of the ramp guide surface is 45-60°.

7. The swing arm welding fixture for new energy vehicle components according to claim 1, characterized in that, Two sliders (16) are provided in each sliding hole (15) and are closely attached to each other.

8. The swing arm welding fixture for new energy vehicle components according to claim 1, characterized in that, The shape of the support platform (5) is adapted to the overall outline of the swing arm (1), and the projected area of ​​the support platform (5) is smaller than the projected area of ​​the swing arm (1), so that when the swing arm (1) is placed on the support platform (5), the weld seam between its upper shell (2) and lower shell (3) is completely exposed outside the support platform (5).

9. A method for using a swing arm welding fixture for new energy vehicle components, characterized in that, Includes the following steps: S1: Place the lower housing (3) on the support platform (5) so that the positioning hole (13) of the lower housing (3) is fitted onto the bottom pin (14); S2: Place the upper housing (2) on the lower housing (3) so that the positioning hole (13) of the upper housing (2) is aligned with the positioning hole (13) of the lower housing (3) and aligned with the tubular positioning pin body (12); S3: Control the pressing mechanism to move downward, so that the ejector pin (11) is inserted into the cavity of the tubular positioning pin body (12), and at the same time, the pressure plate (10) is pressed against the top of the upper housing (2); S4: During the insertion process, the ejector pin (11) pushes the slider (16) to slide radially outward along the inclined guide surface of the sliding hole (15), so that the slider (16) protrudes out of the outer wall of the tubular positioning pin body (12) and presses tightly against the inner wall of the positioning hole (13) of the upper housing (2), while the pressure plate (10) presses the top of the upper housing (2). S5: When the slider (16) presses against the inner wall of the positioning hole (13) of the upper housing (2) to achieve horizontal locking and positioning, and the upper and lower housings (2,3) are vertically pressed by the pressure plate (10), weld the edge seam between the upper housing (2) and the lower housing (3). S6: After welding is completed, control the clamping mechanism to move upward, the ejector pin (11) exits the tubular positioning pin body (12), the slider (16) loses the thrust of the ejector pin (11) and slides down along the inclined guide surface to the return position under the action of gravity. At the return position, the outer side of the slider (16) is flush with the outer side of the tubular positioning pin body (12) tube wall, which does not affect the next insertion of the positioning pin into the upper shell (2); at the same time, the pressure plate (10) disengages from the upper shell (2); S7: Remove the welded swing arm (1).

10. A method of using a swing arm welding fixture for new energy vehicle components according to claim 9, characterized in that, In step S2, there is a gap between the inner wall of the positioning hole (13) of the upper housing (2) and the slider (16) that has not yet protruded outward; in step S4, the slider (16) protrudes outward and abuts against the inner wall of the positioning hole (13) of the upper housing (2) to form a horizontal constraint, and the pressure plate (10) presses against the top of the upper housing (2) to form a vertical constraint.

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