Friction stir welding tool for aluminum alloy of vehicle-mounted product

Abstract

The invention provides a vehicle-mounted product aluminum alloy friction stir welding tool, and belongs to the technical field of wiping welding tools, the vehicle-mounted product aluminum alloy friction stir welding tool comprises a bottom plate, a base is arranged at the top of the bottom plate, a supporting seat capable of placing a product is arranged at the top of the base, a supporting assembly used for supporting the product is arranged at the top of the bottom plate, and the supporting assembly comprises a plurality of floating supporting oil cylinders; a plurality of floating supporting oil cylinders are arranged on the peripheral side of the supporting base, a pressing assembly used for fixing a product is further arranged on the top of the bottom plate, the pressing assembly comprises a plurality of lever oil cylinders, and the lever oil cylinders are installed on the peripheral side of the supporting base; through the arrangement of the multiple floating supporting oil cylinders and the multiple lever oil cylinders, the multiple floating supporting oil cylinders can be adjusted according to the change of the shape of a product to support the bottom of the product, then the multiple lever oil cylinders are started to press the top of the product, it is ensured that the product is stably fixed, and the condition of component displacement is avoided; and the welding precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of friction welding tooling, and more specifically, particularly relates to a friction stir welding tooling for aluminum alloys of vehicle-mounted products. Background Art

[0002] In the manufacturing process of automotive products, aluminum alloy materials are widely used in many parts such as automobile body frames, engine components, seat frames, etc. due to their excellent properties such as light weight, high strength and corrosion resistance.

[0003] As a new type of solid phase welding technology, stir friction welding has unique advantages in aluminum alloy welding. It can achieve high-quality welding at a lower temperature, avoiding defects such as pores and cracks that are prone to occur in traditional fusion welding methods, and can effectively reduce welding deformation to ensure the strength and performance of the welded joints. However, when performing stir friction welding on aluminum alloys of automotive products, the existing welding tooling cannot meet the stable clamping requirements of aluminum alloy parts of different shapes and sizes due to the complex and diverse shapes of automotive products, resulting in easy displacement of parts during the welding process, affecting the welding accuracy. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an aluminum alloy stir friction welding tool for automotive products to solve the technical problem in the prior art that traditional welding tooling cannot meet the stable clamping requirements of aluminum alloy parts of different shapes and sizes, resulting in easy displacement of parts during welding and affecting welding accuracy.

[0005] The purpose and effect of the aluminum alloy friction stir welding tool for vehicle-mounted products of the present invention are achieved by the following specific technical means:

[0006] A stir friction welding tool for aluminum alloy of vehicle-mounted products, comprising a bottom plate, a base is arranged on the top of the bottom plate, a support seat for placing products is arranged on the top of the base, a support assembly for supporting the products is arranged on the top of the bottom plate, the support assembly comprises a plurality of groups of floating support cylinders, a plurality of groups of floating support cylinders are arranged on the peripheral side of the support seat, a clamping assembly for fixing the product is also arranged on the top of the bottom plate, the clamping assembly comprises a plurality of groups of lever cylinders, and the plurality of groups of lever cylinders are installed on the peripheral side of the support seat.

[0007] In a preferred embodiment, a solenoid valve oil circuit block is arranged on the top of the base plate, and a connecting oil circuit is opened on the base plate and the solenoid valve oil circuit block. A plurality of groups of hydraulic solenoid reversing valves are installed on the top of the solenoid valve oil circuit block, and the plurality of groups of hydraulic solenoid reversing valves are respectively connected to the plurality of groups of floating support cylinders and the plurality of groups of lever cylinders through the oil circuit.

[0008] In a preferred embodiment, a time delay sequence valve is also provided on the top of the base plate, and the bottom of the time delay sequence valve is connected to the oil circuit.

[0009] In a preferred embodiment, the support assembly also includes multiple groups of coarse positioning columns, multiple groups of adjustable positioning bases are arranged on the top of the base plate, positioning holes are opened on the top of the positioning bases, the bottom ends of the multiple groups of coarse positioning columns are respectively inserted into the multiple groups of positioning holes, and the product is clamped between the multiple groups of coarse positioning columns.

[0010] In a preferred embodiment, a fixing through slot is formed on the top of the positioning base, and two sets of fixing screws pass through the fixing through slot to be detachably connected to the bottom plate.

[0011] In a preferred embodiment, a plurality of groups of fixed support seats are further provided on the top of the base plate, and support rods are provided on the tops of the plurality of groups of fixed support seats, and the tops of the plurality of groups of support rods are in contact with the product; two groups of support grooves are provided on the circumference of the base and the support seats corresponding to the product mounting feet, wherein two groups of support rods are respectively located in the two groups of support grooves; support top blocks are provided on the tops of the plurality of groups of floating support cylinder push rods, and the tops of the plurality of groups of support top blocks can be in contact with the product.

[0012] In a preferred embodiment, the clamping assembly also includes multiple groups of pressing arms, and the pressing arms are rotatably connected to the push rods of the multiple groups of lever cylinders through first axle pins. A rotating seat is provided on the top of the multiple groups of lever cylinders, and a second axle pin is provided on the rotating seat and the pressing arm. Two groups of the second axle pins are rotatably connected through two groups of connecting rods, and the two groups of connecting rods are respectively located on both sides of the pressing arm and the rotating seat.

[0013] In a preferred embodiment, a waterway cover plate is provided on the top of the product, and pressure blocks are provided at the bottom of multiple groups of pressure arms. The bottoms of multiple groups of pressure blocks are respectively in contact with the product and the waterway cover plate, and a processed weld is provided on the top of the waterway cover plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through the setting of multiple groups of floating support cylinders and multiple groups of lever cylinders, when the tooling is used, the bottom of the product is supported by multiple groups of floating support cylinders, and the floating support cylinders can be adjusted in real time according to the changes in the shape of the product, and then the multiple groups of lever cylinders are started to press the top of the product, which can effectively meet the clamping needs of aluminum alloy vehicle-mounted products of different shapes and sizes; during the welding process, the floating support cylinders and the lever cylinders work together to ensure that the product is stably fixed and avoid component displacement. This stable clamping effect improves welding accuracy, ensures the quality of welded joints, and reduces product defects caused by insufficient welding accuracy.

[0016] 2. Through the setting of the solenoid valve oil circuit block and multiple groups of hydraulic solenoid reversing valves, when using the tooling, multiple groups of hydraulic solenoid reversing valves are connected to the floating support cylinder and the lever cylinder through the oil circuit, so that the operator can easily adjust the movement of the cylinder by controlling the hydraulic solenoid reversing valve; in addition, the setting of the time delay sequence valve makes the tooling more convenient in the operation process, and can adjust the support and clamping force of the product according to the different stages and requirements of the welding process, thereby improving the controllability of the entire welding process.

[0017] 3. Through the setting of coarse positioning columns and adjustable positioning bases, the product can be roughly positioned when using the tooling. Multiple sets of positioning bases can also be adjusted by fixing screws. By adjusting the positions of two sets of fixing screws in the fixed through grooves, the distance between the multiple sets of coarse positioning columns and the product can be adjusted. Multiple sets of coarse positioning columns are respectively located on the sides of the product and can be fixed in the horizontal direction; the product is then supported from different positions through the support rods on multiple sets of fixed support seats and the support top blocks on the top of the floating support cylinder; this multi-directional support structure can well adapt to vehicle-mounted products with complex shapes and ensure the stability of the product during the welding process.

[0018] 4. Through the setting of multiple groups of pressure arms and multiple groups of pressure blocks, when using the tooling, by starting multiple groups of lever cylinders, the multiple groups of pressure arms are rotated around the corresponding rotating seats, so that the multiple groups of pressure blocks are pressed tightly on the waterway cover and the top of the product, so that the tooling can meet the welding needs of aluminum alloy automotive products with complex structures, maintain a stable position during the welding process, and further improve the quality of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of an aluminum alloy friction stir welding tooling for a vehicle-mounted product after assembly;

[0020] Figure 2 It is a schematic diagram of the structure of an aluminum alloy friction stir welding tooling for a vehicle-mounted product after it is unfolded;

[0021] Figure 3It is a structural schematic diagram of the assembly of the solenoid valve oil block and the bottom plate in an aluminum alloy friction stir welding tooling for a vehicle-mounted product of the present invention;

[0022] Figure 4 yes Figure 3 Schematic diagram of the structure after splitting;

[0023] Figure 5 It is a schematic structural diagram of an assembled support assembly in an aluminum alloy friction stir welding tooling for a vehicle-mounted product of the present invention;

[0024] Figure 6 yes Figure 5 Schematic diagram of the structure after splitting;

[0025] Figure 7 It is a schematic structural diagram of a disassembled clamping assembly in a vehicle-mounted aluminum alloy friction stir welding tooling of the present invention;

[0026] Figure 8 yes Figure 7 A magnified schematic diagram of area a.

[0027] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0028] 11. Bottom plate; 12. Base; 13. Product; 14. Support seat; 15. Solenoid valve oil block; 16. Hydraulic solenoid reversing valve; 17. Time delay sequence valve; 21. Floating support cylinder; 211. Support top block; 22. Coarse positioning column; 23. Positioning base; 24. Positioning hole; 25. Fixed through groove; 26. Fixing screw; 27. Fixed support seat; 28. Support rod; 29. ​​Support groove; 31. Lever cylinder; 32. Pressure arm; 33. Rotating seat; 34. Connecting rod; 35. Waterway cover; 36. Pressure block; 37. Processing weld. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but cannot be used to limit the scope of protection of the present invention.

[0030] Example:

[0031] As attached Figures 1 to 8 As shown:

[0032] The present invention provides an aluminum alloy stir friction welding tool for vehicle-mounted products, comprising a bottom plate 11, a base 12 is arranged on the top of the bottom plate 11, a support seat 14 on which a product 13 can be placed is arranged on the top of the base 12, a support assembly for supporting the product 13 is arranged on the top of the bottom plate 11, the support assembly comprises a plurality of groups of floating support cylinders 21, a plurality of groups of floating support cylinders 21 are arranged on the peripheral side of the support seat 14, the bottom of the product 13 is supported by the plurality of groups of floating support cylinders 21, and the floating support cylinders 21 can be adjusted in real time according to the complex curved surface shape of the product 13, so as to ensure stable support for the product 13, thereby avoiding the displacement and deformation of components caused by loose support during the stir friction welding process.

[0033] A clamping assembly for fixing the product 13 is also provided on the top of the base plate 11. The clamping assembly includes multiple groups of lever cylinders 31. The multiple groups of lever cylinders 31 are installed on the peripheral side of the support seat 14. The multiple groups of lever cylinders 31 are started to clamp the top of the product 13, which can effectively meet the clamping requirements of aluminum alloy vehicle-mounted products of different shapes and sizes. During the welding process, the floating support cylinder 21 and the lever cylinder 31 work together to ensure that the product 13 is stably fixed through the floating support at the bottom of the product 13 and the effective clamping of the top, thereby avoiding the displacement of components, ensuring the quality of the welded joint, and reducing product defects caused by insufficient welding precision.

[0034] Please refer to Figure 3 and Figure 4 As shown, a solenoid valve oil circuit block 15 is arranged on the top of the base plate 11, and a connecting oil circuit is opened on the base plate 11 and the solenoid valve oil circuit block 15, and multiple groups of hydraulic solenoid reversing valves 16 are installed on the top of the solenoid valve oil circuit block 15, so that the oil circuit system of the entire tooling is more compact and integrated, and the oil circuits of the multiple groups of hydraulic solenoid reversing valves 16 are respectively connected to the multiple groups of floating support cylinders 21 and the multiple groups of lever cylinders 31; the operator only needs to control these hydraulic solenoid reversing valves 16 to conveniently adjust the actions of each group of cylinders to provide control for the stable clamping and pressing of the product 13; this integrated oil circuit improves the convenience of use of the tooling, and the production operator only needs to adjust the corresponding hydraulic solenoid reversing valves 16 according to the different characteristics of the product 13 to complete the control of the support and fixation of the product 13.

[0035] Please refer to Figure 4As shown, a time delay sequence valve 17 is also provided on the top of the bottom plate 11, and the bottom of the time delay sequence valve 17 is connected to the oil circuit, which can adjust the support and pressing force of the product 13 according to the different stages and requirements of the welding process; specifically, in the early stage of welding, the time delay sequence valve 17 will first drive the floating support cylinder 21 to stably support the bottom of the product 13 to ensure that its initial position is accurate; then, the time delay sequence valve 17 will start the lever cylinder 31 to effectively press the top of the product 13, thereby ensuring that the product 13 maintains an ideal position and posture during the entire welding process; this timing control not only improves the convenience of tooling operation, but also can maximize the satisfaction of different welding requirements. The requirements of the process, such as in some welding processes that require preheating, the initial support force can be appropriately relaxed to facilitate uniform heat distribution of the product 13; and in the actual welding stage, it is necessary to increase the clamping force to ensure the quality of the weld; the time delay sequence valve 17 can adjust the action timing and strength of the cylinder according to the different requirements of the welding process, making the entire welding process more controllable and efficient; in addition, this timing control can also avoid damage to the product 13 caused by improper operation. If clamping is implemented when the support is not in place, it may also cause problems such as component displacement. With the control of the time delay sequence valve 17, these potential risks can be effectively avoided, thereby ensuring the welding quality.

[0036] Please refer to Figure 5 and Figure 6 As shown, the support assembly also includes multiple groups of coarse positioning columns 22, multiple groups of adjustable positioning bases 23 are arranged on the top of the bottom plate 11, and positioning holes 24 are opened on the top of the positioning bases 23. The bottom ends of the multiple groups of coarse positioning columns 22 are respectively penetrated in the multiple groups of positioning holes 24, and the product 13 is clamped between the multiple groups of coarse positioning columns 22; a fixed through groove 25 is opened on the top of the positioning base 23, and two groups of fixing screws 26 pass through the fixed through groove 25 and are detachably connected to the bottom plate 11. By adjusting the position of the two groups of fixing screws 26 in the fixed through groove 25, the spacing between the multiple groups of coarse positioning columns 22 and the product 13 can be adjusted. The multiple groups of coarse positioning columns 22 are respectively located at the product 1 The 3-week side can be fixed in the horizontal direction; not only can the product 13 be roughly positioned, but also the spacing between the multiple groups of rough positioning columns 22 and the product 13 can be flexibly adjusted by adjusting the fixed through slots 25 and two groups of fixing screws 26 on the top of the positioning base 23, so as to adapt to vehicle-mounted products of different sizes and shapes; and the product 13 can be supported from different positions by the support rods 28 on the multiple groups of fixed support seats 27 and the support top block 211 on the top of the floating support cylinder 21; this multi-directional support structure can better adapt to vehicle-mounted products of complex shapes and ensure the stability of the product 13 during the welding process.

[0037] Please refer to Figure 3 and Figure 4As shown, multiple groups of fixed support seats 27 are also arranged on the top of the bottom plate 11, and support rods 28 are arranged on the tops of the multiple groups of fixed support seats 27. The tops of the multiple groups of support rods 28 are in contact with the product 13. These support rods 28 can provide stable support for the product 13 from different positions to ensure that it maintains an ideal position and posture during the welding process; at the same time, two groups of support grooves 29 are opened on the sides of the base 12 and the support seat 14 corresponding to the mounting feet of the product 13, wherein the two groups of support rods 28 are respectively located in the two groups of support grooves 29, further strengthening the positioning and support of the product 13; multiple groups of floating support cylinders 21 are arranged on the tops of the push rods There are support top blocks 211, and the tops of multiple groups of support top blocks 211 can all contact with the product 13. These floating support cylinders 21 can dynamically adjust the support strength for the product 13 according to the needs of the welding process; this solution that combines fixed support and floating support can not only ensure the stability of the product 13 during the welding process, but also has strong adaptability. The fixed support seat 27 and the support rod 28 can provide basic support for the product 13, while the floating support cylinder 21 and the support top block 211 can be dynamically adjusted according to the process requirements to meet the support requirements of products 13 of different sizes and shapes.

[0038] Please refer to Figure 7 and Figure 8 As shown, the clamping assembly also includes multiple groups of clamping arms 32, and multiple groups of lever cylinders 31 push rods are rotatably connected with clamping arms 32 through first axle pins. These clamping arms 32 can apply required pressure to the product 13 through the drive of the lever cylinder 31 to ensure that it maintains a fixed position during the welding process; at the same time, multiple groups of lever cylinders 31 are each provided with a rotating seat 33 on the top, and second axle pins are each provided on the rotating seat 33 and the clamping arm 32. The two groups of second axle pins are rotatably connected through two groups of connecting rods 34, which can not only enhance the stability of the clamping arm 32, but also flexibly control the pressure direction and action point of the clamping arm 32 by adjusting the angle of the connecting rod 34 to meet the requirements of different shapes and sizes of products 13; the two groups of connecting rods 34 are respectively located on both sides of the clamping arm 32 and the rotating seat 33. This symmetrical arrangement not only improves the bearing capacity of the clamping arm 32, but also ensures uniform distribution of pressure, avoids deformation or position displacement of the product 13 caused by uneven pressure, and improves the stability of the clamping assembly.

[0039] Please refer to Figure 7 and Figure 8As shown, a waterway cover plate 35 is arranged on the top of the product 13, and a plurality of pressure arms 32 are provided with pressure blocks 36 at the bottom, and the bottoms of the plurality of pressure blocks 36 are in contact with the product 13 and the waterway cover plate 35 respectively; it can ensure that the pressure blocks 36 can directly act on the surface of the product 13 and the waterway cover plate 35, thereby providing effective clamping force, and a processing weld 37 is also arranged on the top of the waterway cover plate 35; after starting the plurality of lever cylinders 31, the plurality of pressure arms 32 will rotate around the corresponding rotating seats 33 respectively, so that the plurality of pressure blocks 36 are respectively pressed on the waterway cover plate 35 and the top of the product 13, this clamping method can not only ensure that the entire product 13 maintains a stable position, but also can flexibly adjust the pressure of each pressure block 36 according to the needs of the welding process, so as to adapt to aluminum alloy vehicle-mounted products with different complex structures; it ensures that the product 13 can maintain an ideal state during the welding process, and at the same time, the setting of the processing weld 37 also lays the foundation for the welding operation, and provides a strong guarantee for obtaining high-quality welds.

[0040] Specific usage and function of this embodiment: When the tool is used, according to the size and shape of the product 13 to be welded, by loosening the fixing screws 26, the adjustable positioning base 23 is moved, and the product 13 is preliminarily positioned by multiple groups of rough positioning columns 22 to ensure that the product 13 is placed in a roughly correct position; the product 13 is placed on the support seat 14 so that the product 13 is clamped between the multiple groups of rough positioning columns 22, and the tops of the multiple groups of support rods 28 are in contact with the product to provide a certain support for the product 13, and the support top blocks 211 at the tops of the push rods of the multiple groups of floating support cylinders 21 are also ready to contact the product 13 to further support the product 13 from below; this multi-directional support structure can adapt to products 13 of different shapes and sizes, and ensure the placement stability of the product 13 on the tool; the solenoid valve oil circuit block 15 on the bottom plate 11 is connected to the multiple groups of hydraulic solenoid reversing valves 16 through the oil circuit, and the hydraulic oil is respectively transported to the multiple groups of floating support cylinders 2 through the oil circuit. 1 and multiple groups of lever cylinders 31, the operator can adjust the flow direction and pressure of the hydraulic oil by controlling the hydraulic solenoid reversing valve 16, so that the floating support cylinder 21 and the lever cylinder 31 start to move; the piston rods of the multiple groups of floating support cylinders 21 extend out, and push upward through the support top block 211, so as to stably support the product 13 from below to prevent the product 13 from sinking or shifting during the welding process; at the same time, the piston rod of the lever cylinder 31 extends out, and drives the pressure arm 32 to move through the first shaft pin. Under the coordinated action of the rotating seat 33, the second shaft pin and the connecting rod 34 at the top of the lever cylinder 31, the pressure block 36 at the bottom of the pressure arm 32 will press on the product 13 and the waterway cover plate 35, and the product 13 will be pressed and fixed, so as to ensure that the product 13 will not shake during the welding process and ensure the welding accuracy; during the welding process, the time delay sequence valve 17 controls the oil flow sequence and time in the hydraulic system according to the preset time parameters, so as to further optimize the welding process.

[0041] After welding is completed, the hydraulic electromagnetic reversing valve 16 is operated to retract the piston rods of the floating support cylinder 21 and the lever cylinder 31 to release the support and pressure on the product 13.

[0042] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A friction stir welding tool for aluminum alloys of vehicle-mounted products, characterized by: The invention comprises a bottom plate (11), a base (12) is arranged on the top of the bottom plate (11), a support seat (14) on which a product (13) is placed is arranged on the top of the base (12), a support assembly for supporting the product (13) is arranged on the top of the bottom plate (11), the support assembly comprises a plurality of groups of floating support cylinders (21), a plurality of groups of the floating support cylinders (21) are arranged on the peripheral side of the support seat (14), and a clamping assembly for fixing the product (13) is also arranged on the top of the bottom plate (11), the clamping assembly comprises a plurality of groups of lever cylinders (31), and the plurality of groups of the lever cylinders (31) are installed on the peripheral side of the support seat (14).

2. The aluminum alloy friction stir welding tool for vehicle-mounted products according to claim 1, characterized in that: A solenoid valve oil circuit block (15) is arranged on the top of the base plate (11); a communicating oil circuit is provided on the base plate (11) and the solenoid valve oil circuit block (15); a plurality of groups of hydraulic solenoid reversing valves (16) are installed on the top of the solenoid valve oil circuit block (15); the plurality of groups of hydraulic solenoid reversing valves (16) are respectively connected to the plurality of groups of floating support oil cylinders (21) and the plurality of groups of lever oil cylinders (31) through the oil circuit.

3. The aluminum alloy friction stir welding tool for vehicle-mounted products according to claim 2, characterized in that: A time delay sequence valve (17) is also provided on the top of the bottom plate (11), and the bottom of the time delay sequence valve (17) is connected to the oil circuit.

4. The aluminum alloy friction stir welding tool for vehicle-mounted products according to claim 1, characterized in that: The support assembly also includes a plurality of groups of coarse positioning columns (22), a plurality of groups of adjustable positioning bases (23) are arranged on the top of the base plate (11), a positioning hole (24) is opened on the top of the positioning base (23), the bottom ends of the plurality of groups of coarse positioning columns (22) are respectively inserted into the plurality of groups of positioning holes (24), and the product (13) is clamped between the plurality of groups of coarse positioning columns (22).

5. The aluminum alloy friction stir welding tool for vehicle-mounted products according to claim 4, characterized in that: A fixing through slot (25) is provided on the top of the positioning base (23), and two sets of fixing screws (26) pass through the fixing through slot (25) to be detachably connected to the bottom plate (11).

6. The aluminum alloy friction stir welding tool for vehicle-mounted products according to claim 5, characterized in that: A plurality of fixed support seats (27) are also arranged on the top of the bottom plate (11), and a support rod (28) is arranged on the top of each of the plurality of fixed support seats (27), and the tops of each of the plurality of support rods (28) are in contact with the product (13); two groups of support grooves (29) are provided on the circumferential sides of the base (12) and the support seat (14) corresponding to the mounting feet of the product (13), wherein two groups of support rods (28) are respectively located in the two groups of support grooves (29); a support top block (211) is arranged on the top of each of the push rods of the plurality of floating support cylinders (21), and the tops of each of the plurality of support top blocks (211) are in contact with the product (13).

7. The aluminum alloy friction stir welding tool for vehicle-mounted products according to claim 1, characterized in that: The clamping assembly also includes multiple groups of clamping arms (32), and the clamping arms (32) are rotatably connected to the push rods of the multiple groups of lever cylinders (31) via a first axle pin. A rotating seat (33) is provided on the top of the multiple groups of lever cylinders (31). A second axle pin is provided on the rotating seat (33) and the clamping arms (32). Two groups of the second axle pins are rotatably connected via two groups of connecting rods (34), and the two groups of connecting rods (34) are respectively located on both sides of the clamping arms (32) and the rotating seat (33).

8. The aluminum alloy friction stir welding tool for vehicle-mounted products according to claim 7, characterized in that: A waterway cover plate (35) is arranged on the top of the product (13), and a plurality of groups of pressure arms (32) are each provided with a pressure block (36) at the bottom. The bottoms of the plurality of groups of pressure blocks (36) are respectively in contact with the product (13) and the waterway cover plate (35), and a processed weld (37) is arranged on the top of the waterway cover plate (35).

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