Magnesium alloy sheet high speed friction stir welding clamping device

Abstract

The application belongs to the technical field of friction stir welding clamping tool, and particularly relates to a magnesium alloy sheet high-speed friction stir welding clamping device, which comprises a positioning base, a sheet positioning frame is detachably fixedly connected to the center position of the positioning base, negative pressure pieces are symmetrically arranged on the lower surface of the positioning base, a negative pressure head fixedly and conductively connected with the negative pressure pieces is arranged on the sheet positioning frame, a dynamic micro cooling piece is arranged at the middle position of the sheet positioning frame, the dynamic micro cooling piece comprises a water-cooled sliding block, the water-cooled sliding block is used for moving and cooling the moving welding point of the sheet, the water-cooled sliding block in the dynamic micro cooling piece can move following the friction stir welding point between the sheet, so that the timeliness of welding cooling is improved, and the welding cooling efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of friction stir welding clamping fixture technology, specifically relating to a high-speed friction stir welding clamping device for magnesium alloy thin plates. Background Technology

[0002] In aerospace, automotive lightweighting, and other fields, magnesium alloy sheets are widely used due to their low density and high specific strength. Friction stir welding, as a solid-state joining technology, effectively avoids defects such as oxidation and burn-through that are prone to occur during magnesium alloy fusion welding, making it a core process for joining magnesium alloy sheets. However, magnesium alloy sheets are typically 0.3-3mm thick and have characteristics such as low strength, poor plasticity, and a high coefficient of thermal expansion (approximately 1.5 times that of aluminum alloys). High-speed friction stir welding at speeds greater than 1m / min presents the following technical challenges: 1. Insufficient clamping and positioning accuracy: Traditional clamping devices mostly use fixed fixtures or single pneumatic / hydraulic clamping, which are difficult to adapt to the positioning requirements of magnesium alloy thin plates of different shapes such as rectangular and irregular shapes. Due to the poor rigidity of magnesium alloy thin plates, the axial force of the stirring head during welding is usually 1-3kN. It is easy to cause displacement or warping due to the axial force and torque of the stirring head, resulting in a weld misalignment greater than 0.2mm. Excessive weld misalignment leads to defects such as incomplete penetration and poor weld formation. At the same time, single-point or local clamping can easily cause local plastic deformation of the plate, which damages the dimensional accuracy of the workpiece. Second, heat deformation control is difficult. Although high-speed friction stir welding has a low heat input, magnesium alloy has a low thermal conductivity of about 156 W / (m·K). Heat tends to accumulate in the welding area, which leads to an expansion of the heat-affected zone, usually greater than 5 mm. In addition, the residual stress generated by the temperature gradient during the cooling process can cause the thin plate to warp and deform, with a deformation of 1-3 mm / m. Traditional cooling methods are mostly fixed water-cooled back plates, which are ineffective in following the movement of dynamic weld points, have low cooling efficiency, and are difficult to suppress deformation caused by local overheating.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a high-speed friction stir welding clamping device for magnesium alloy thin plates in order to solve the above problems. This invention can achieve efficient clamping of the plates to be welded and cooling along with the welding point.

[0005] The present invention achieves the above-mentioned objectives through the following technical solution: a high-speed friction stir welding clamping device for magnesium alloy thin plates, comprising a positioning base, a plate positioning frame detachably fixedly connected to the center of the positioning base, multiple telescopic positioning components slidably installed on the upper end and sides of the positioning base, the telescopic positioning components being used to fix the plate, negative pressure components symmetrically arranged on the lower surface of the positioning base, a negative pressure head fixedly connected to the negative pressure components on the plate positioning frame, a dynamic micro-cooling component arranged in the middle of the plate positioning frame, the dynamic micro-cooling component including a water-cooled slider, the water-cooled slider being used to move and cool the plate as it moves along the weld joint, and plate cooling components being evenly slidably installed on both sides of the middle of the plate positioning frame.

[0006] Preferably, the upper surface of the positioning base is provided with end sliding holes, and the telescopic positioning component includes a first lever cylinder. The lower end of the first lever cylinder is rotatably mounted with mounting rods on both sides. The mounting rods are rotatably engaged in the grooves on the sidewalls of the end sliding holes. The lower end of the first lever cylinder is detachably and fixedly connected to a telescopic cylinder, which is a telescopic hydraulic cylinder or a telescopic air cylinder. The telescopic cylinder is fixedly connected to the lower surface of the positioning base.

[0007] Preferably, the upper surface of the positioning base is provided with side sliding grooves on both sides. The telescopic positioning component also includes a second lever cylinder. The second lever cylinder is slidably engaged in the side sliding groove through a slide block. An adjusting screw is rotatably installed inside the side sliding groove. The adjusting screw passes through the slide block and is threadedly connected to the slide block. One end of the adjusting screw passes through the side sliding groove and is fixedly connected to an adjusting motor. The adjusting motor is fixedly installed on the side wall of the positioning base.

[0008] Preferably, position sensors are embedded on one side of the ends of both the first lever cylinder and the second lever cylinder, and soft rubber pads are fixedly installed on one side of the ends of both the first lever cylinder and the second lever cylinder.

[0009] Preferably, the plate positioning frame includes a main beam and support legs. The upper surface of the positioning base is provided with a support groove that mates with the support legs. The support legs are inserted into the support groove. The negative pressure component includes a negative pressure pump and a negative pressure pipe. The negative pressure pump is fixedly installed on the lower surface of the positioning base. The negative pressure pipe is connected to the negative pressure pump, and one end of the negative pressure pipe extends into the support groove and is fitted into the support leg. The support leg is provided with a head groove for accommodating a negative pressure head. The negative pressure head is fixedly installed at the end of the head groove.

[0010] Preferably, a fixing member is provided on one side of the support leg. The fixing member includes a fixing frame, which is fixedly connected to the positioning base. A plug-in frame is slidably inserted into the fixing frame. One end of the plug-in frame is inserted into the support leg, and a fixing spring is sleeved on the plug-in frame. One end of the fixing spring is fixedly connected to the fixing frame, and the other end is fixedly connected to a pressure plate. The pressure plate is slidably sleeved on the plug-in frame.

[0011] Preferably, the dynamic micro-cooling component further includes a drive motor, which is fixedly installed at the middle of one end of the plate positioning frame. A drive screw is fixedly installed at the output end of the drive motor. The water-cooled slider has a hollow structure inside and a threaded hole is provided on the water-cooled slider. The water-cooled slider is threadedly connected to the drive screw through the threaded hole. The dynamic micro-cooling component further includes a micro water tank, which is equipped with a circulating water pump. The circulating water pump is connected to the water-cooled slider through a conduit.

[0012] Preferably, the plate cooling component includes multiple flat sliding frames symmetrically arranged on both sides of the middle of the plate positioning frame. Multiple sliding grooves are symmetrically and evenly opened on the plate positioning frame along its length direction. The flat sliding frames are slidably engaged in the sliding grooves. The plate cooling component also includes a pipe for connecting the multiple flat sliding frames. The pipe is a rubber hose. A cooling box is symmetrically arranged on the lower surface of the positioning base. A circulation pump is installed in the cooling box. The output end of the circulation pump is connected to the pipe.

[0013] Preferably, the two sides of the middle part of the plate positioning frame are respectively fixedly installed with slide rods of the same number and corresponding positions as the flat sliding frames. One end of the flat sliding frame is sleeved on the slide rod, and a return spring is sleeved on the slide rod. One end of the return spring is fixedly connected to the flat sliding frame, and the other end of the return spring is fixedly connected to the side wall of the plate positioning frame.

[0014] The beneficial effects of this invention are: 1. This invention achieves preliminary positioning of the plate to be welded by cooperating with the plate positioning frame, negative pressure component and negative pressure head. Then, by using the telescopic positioning component on the upper surface of the positioning base, it can achieve precise positioning of plates of different shapes. Moreover, the multi-point clamping method is beneficial to improve the stability and clamping effect. 2. The present invention, through the setting of dynamic micro-cooling components and plate cooling components, enables the water-cooled slider in the dynamic micro-cooling components to follow the stirring friction welding points between the plates, thereby improving the timeliness of welding cooling and improving welding cooling efficiency. Attached Figure Description

[0015] Figure 1This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a partial structural schematic diagram of the dynamic micro-cooling component in this invention; Figure 4 This is a schematic diagram showing the positions of the end sliding hole and the side sliding groove in this invention; Figure 5 This is a schematic diagram of the installation structure of the negative pressure component in this invention. Figure 1 ; Figure 6 This is a schematic diagram of the plate cooling component in this invention; Figure 7 This is a schematic diagram of the installation structure of the negative pressure component in this invention. Figure 2 ; Figure 8 This is a schematic diagram of the connection structure of the first lever cylinder in this invention; Figure 9 This is a schematic diagram of the connection structure of the second lever cylinder in this invention; Figure 10 for Figure 1 Enlarged view of the structure at point A in the middle; Figure 11 for Figure 5 Enlarged view of the structure at point B; Figure 12 for Figure 5 Enlarged view of the structure at point C; Figure 13 for Figure 5 Enlarged view of the structure at point D.

[0016] In the diagram: 1. Positioning base; 2. Plate positioning frame; 201. Main beam frame; 202. Support leg; 3. Telescopic positioning component; 301. First lever cylinder; 302. Mounting rod; 303. Telescopic cylinder; 304. Second lever cylinder; 305. Slide seat; 306. Adjusting screw; 307. Adjusting motor; 308. Position sensor; 309. Soft rubber pad; 4. Negative pressure component; 401. Negative pressure pump; 402. Negative pressure pipe; 5. Negative pressure head; 6. Dynamic Miniature cooling components; 601, water-cooled slider; 602, drive motor; 603, drive screw; 604, miniature water tank; 605, circulating water pump; 7, plate cooling components; 701, flat sliding frame; 702, pipe fittings; 703, cooling box; 704, circulating pump; 705, sliding rod; 706, return spring; 8, end sliding hole; 9, side sliding groove; 10, fixing component; 1001, fixing bracket; 1002, plug-in bracket; 1003, fixing spring. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method, in conjunction with its accompanying drawings, will be used to describe the solution.

[0018] Please see Figures 1-13 As shown, a high-speed friction stir welding clamping device for magnesium alloy thin plates includes a positioning base 1. A plate positioning frame 2 is detachably fixedly connected to the center of the positioning base 1. Multiple telescopic positioning components 3 are slidably installed on the upper end and sides of the positioning base 1, and the telescopic positioning components 3 are used to fix the plate. Negative pressure components 4 are symmetrically arranged on the lower surface of the positioning base 1. A negative pressure head 5 is provided on the plate positioning frame 2 and is fixedly connected to the negative pressure components 4. A dynamic micro-cooling component 6 is provided in the middle of the plate positioning frame 2. The dynamic micro-cooling component 6 includes a water-cooled slider 601. The end of the water-cooled slider 601 is arc-shaped and is used to move and cool the weld points following the movement of the plate. Plate cooling components 7 are slidably installed on both sides of the middle of the plate positioning frame 2.

[0019] The upper surface of the positioning base 1 is provided with end sliding holes 8. The telescopic positioning component 3 includes a first lever cylinder 301. The first lever cylinder 301 is a JGL series lever cylinder. The lower end of the first lever cylinder 301 is rotatably mounted with mounting rods 302 on both sides. The mounting rods 302 are snapped into the grooves on the side walls of the end sliding holes 8. The lower end of the first lever cylinder 301 is detachably fixedly connected to a telescopic cylinder 303. The telescopic cylinder 303 is a telescopic hydraulic cylinder or a telescopic air cylinder. The cylinder body of the telescopic cylinder 303 is fixedly connected to the lower surface of the positioning base 1.

[0020] All telescopic cylinders 303 are connected to the same hydraulic or pneumatic pump station, and each pump station's output pipeline is equipped with a synchronization valve to achieve synchronized telescopic movements of all telescopic cylinders 303. The synchronization valves, hydraulic pump station, and pneumatic pump station are all commercially available products and will not be described in detail here.

[0021] The upper surface of the positioning base 1 is provided with side sliding grooves 9 on both sides. The telescopic positioning component 3 also includes a second lever cylinder 304. The second lever cylinder 304 is a JGL series lever cylinder of the same model as the first lever cylinder 301. The second lever cylinder 304 is slidably engaged in the side sliding groove 9 through the slide seat 305. An adjusting screw 306 is rotatably installed inside the side sliding groove 9. The adjusting screw 306 passes through the slide seat 305 and is threadedly connected to the slide seat 305. One end of the adjusting screw 306 passes through the side sliding groove 9 and is fixedly connected to an adjusting motor 307. The adjusting motor 307 is a servo motor and is fixedly installed on the side wall of the positioning base 1.

[0022] Position sensors 308 are embedded on one side of the end surfaces of the first lever cylinder 301 and the second lever cylinder 304, and soft rubber pads 309 are fixedly installed on one side of the end surfaces of the first lever cylinder 301 and the second lever cylinder 304. The soft rubber pads 309 can reduce the damage to the plate material caused by the first lever cylinder 301 and the second lever cylinder 304.

[0023] The telescopic cylinder 303, the first lever cylinder 301, the second lever cylinder 304, and the position sensors 308 on the first and second lever cylinders 301 and 304 are all electrically connected to an external controller (not shown in the figure). After the board is placed on the board positioning frame 2, the telescopic cylinder 303 drives the first lever cylinder 301 to move. The position sensor 308 on the first lever cylinder 301 detects the relative position of the first lever cylinder 301 and the board in real time and transmits the signal to the external controller. The external controller accurately controls the clamping action and stop position of the first lever cylinder 301 according to the detection signal of the position sensor 308, so as to achieve precise positioning and clamping of the end of the board. The soft rubber pad 309 can reduce the contact damage of the first lever cylinder 301 to the board.

[0024] All adjusting motors 307 are electrically connected to the same motion controller. Position sensor 308 transmits the plate position signal to an external controller, which then sends instructions to the motion controller. The motion controller uniformly sends pulse signals to all adjusting motors 307 to achieve synchronous drive. The adjusting motors 307 operate and drive the adjusting screw 306 to rotate, causing the slide 305 to move synchronously along the adjusting screw 306. As the slide 305 moves, it drives the second lever cylinder 304 to move synchronously. The external controller, based on the relative position signal between the second lever cylinder 304 and the plate material fed back by the position sensor 308, controls the clamping action and stop position of the second lever cylinder 304, enabling the second lever cylinder 304 to complete the positioning and clamping of the plate material. This achieves multi-point synchronous clamping of the side of the plate material to be welded, ensuring uniform clamping force. Both the external controller and the motion controller are commercially available products and will not be described in detail here.

[0025] The plate positioning frame 2 includes a main beam frame 201 and a support leg 202. The upper surface of the positioning base 1 is provided with a support groove that cooperates with the support leg 202. The support leg 202 is inserted into the support groove so as to position the plate by means of the negative pressure pump 401 and the plate positioning frame 2.

[0026] The negative pressure component 4 includes a negative pressure pump 401 and a negative pressure pipe 402. The negative pressure pump 401 is fixedly installed on the lower surface of the positioning base 1. The negative pressure pipe 402 is connected to the negative pressure pump 401, and one end of the negative pressure pipe 402 extends into the support groove and is fitted into the support leg 202. The support leg 202 is provided with a head groove for accommodating the negative pressure head 5. The negative pressure head 5 is fixedly installed at the end of the head groove and is connected to the negative pressure pipe 402.

[0027] A fixing member 10 is provided on one side of the support leg 202. The fixing member 10 includes a fixing frame 1001, which is fixedly connected to the positioning base 1. A connector 1002 is slidably inserted into the fixing frame 1001. One end of the connector 1002 is inserted into the support leg 202, and a fixing spring 1003 is sleeved on the connector 1002. One end of the fixing spring 1003 is fixedly connected to the fixing frame 1001, and the other end is fixedly connected to a pressure plate. The pressure plate is slidably fitted onto the connector 1002. After the plate positioning frame 2 is installed on the positioning base 1, the lower half of the support leg 202 is inserted into the support groove. The pressure plate presses the upper half of the support leg 202 under the elastic force of the fixing spring 1003, thus assisting in the positioning of the plate positioning frame 2. The support leg is made of rubber, which, with the cooperation of the fixing member 10, can reduce the vibration of the plate positioning frame 2. The end of the negative pressure pipe 402 extends into the support leg 202 and is sealed and inserted into the slot in the support leg 202. After the negative pressure pump 401 is turned on, the plate can be initially positioned through the negative pressure head 5.

[0028] The dynamic micro-cooling component 6 also includes a drive motor 602, which is fixedly installed at the middle of one end of the plate positioning frame 2. A drive screw 603 is fixedly installed at the output end of the drive motor 602. The water-cooled slider 601 has a hollow structure inside and contains cooling water. A threaded hole is opened on the water-cooled slider 601, and the water-cooled slider 601 is threadedly connected to the drive screw 603 through the threaded hole. The dynamic micro-cooling component 6 also includes a micro-water tank 604. The micro-water tank 604 can be equipped with a cooling mechanism, such as a cooling plate, to increase the cooling efficiency of the welding point. The micro-water tank 604 is equipped with a circulating water pump 605. The circulating water pump 605 is connected to the water-cooled slider 601 through a conduit (which is a retractable rubber hose). The drive motor 602 is electrically connected to an external controller. The external controller controls the drive motor 602 to work synchronously with the stirring head. The drive motor 602 drives the drive screw 603 to rotate. The rotation of the drive screw 603 causes the water-cooled slider 601, which is threadedly connected to it, to move horizontally. This allows the water-cooled slider 601 to move synchronously with the welding point. At the same time, the circulating water pump 605 is turned on, so that the water-cooled slider 601 can continuously cool the welding point.

[0029] The plate cooling component 7 includes multiple flat sliding frames 701 symmetrically arranged on both sides of the middle part of the plate positioning frame 2. Multiple sliding grooves are symmetrically and evenly opened on the plate positioning frame 2 along its length direction. Each flat sliding frame 701 is slidably engaged in the sliding groove. The plate cooling component 7 also includes a pipe 702 for connecting the multiple flat sliding frames 701. The pipe 702 is a rubber hose. A cooling box 703 is symmetrically arranged on the lower surface of the positioning base 1. A circulation pump 704 is installed in the cooling box 703. The output end of the circulation pump 704 is connected to the pipe 702. Slide rods 705, equal in number and corresponding in position to the flat sliding frames 701, are fixedly installed on both sides of the middle part of the plate positioning frame 2. One end of the flat sliding frame 701 is sleeved on the slide rod 705. A return spring 706 is sleeved on the slide rod 705. One end of the return spring 706 is fixedly connected to the flat sliding frame 701, and the other end of the return spring 706 is fixedly connected to the side wall of the plate positioning frame 2. When the water-cooled slider 601 moves in the middle of the plate positioning frame 2, since the end of the water-cooled slider 601 is arc-shaped, the opposite ends of the flat sliding frames 701 on both sides of the middle of the plate positioning frame 2 are also arc-shaped. When the arc-shaped end of the water-cooled slider 601 contacts the arc-shaped end of the flat sliding frame 701, the water-cooled slider 601 can overcome the elastic force of the return spring 706 to squeeze the flat sliding frame 701, causing the two flat sliding frames 701 in contact with the water-cooled slider 601 to move in opposite directions. At this time, the return spring 706 corresponding to the two flat sliding frames 701 is in a compressed state. When the two flat sliding frames 701 disengage from the water-cooled slider 601, under the action of the return elastic force of the return spring 706, the two flat sliding frames 701 return to their original positions. By using the circulating pump 704, pipe fittings 702, and cooling box 703, water can be exchanged inside the flat sliding frame 701, thereby improving water cooling efficiency and enabling better overall cooling of the welding line after the plate is welded.

[0030] Technical features not described in this invention can be implemented using existing technologies and will not be elaborated upon here. This invention is not limited to the specific embodiments described above; any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this invention should also fall within the protection scope of this invention.

Claims

1. A high-speed friction stir welding clamping device for magnesium alloy thin plates, comprising a positioning base (1), characterized in that: The positioning base (1) is detachably fixedly connected to the plate positioning frame (2). Multiple telescopic positioning components (3) are slidably installed on the upper end and side of the positioning base (1). The telescopic positioning components (3) are used to fix the plate. Negative pressure components (4) are symmetrically arranged on the lower surface of the positioning base (1). A negative pressure head (5) is fixedly connected to the negative pressure component (4) on the plate positioning frame (2). A dynamic micro cooling component (6) is arranged in the middle of the plate positioning frame (2). The dynamic micro cooling component (6) includes a water-cooled slider (601). The water-cooled slider (601) is used to move and cool down the moving weld points of the plate. Plate cooling components (7) are evenly slidably installed on both sides of the middle of the plate positioning frame (2).

2. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 1, characterized in that: The upper surface of the positioning base (1) is provided with end sliding holes (8). The telescopic positioning component (3) includes a first lever cylinder (301). The lower end of the first lever cylinder (301) is rotatably mounted with mounting rods (302) on both sides. The mounting rods (302) are rotatably engaged in the grooves on the side walls of the end sliding holes (8). The lower end of the first lever cylinder (301) is detachably fixedly connected with a telescopic cylinder (303). The telescopic cylinder (303) is a telescopic hydraulic cylinder or a telescopic air cylinder. The telescopic cylinder (303) is fixedly connected to the lower surface of the positioning base (1).

3. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 2, characterized in that: The upper surface of the positioning base (1) is provided with side sliding grooves (9) on both sides. The telescopic positioning component (3) also includes a second lever cylinder (304). The second lever cylinder (304) is slidably engaged in the side sliding groove (9) through the slide block (305). An adjusting screw (306) is rotatably installed inside the side sliding groove (9). The adjusting screw (306) passes through the slide block (305) and is threadedly connected to the slide block (305). One end of the adjusting screw (306) passes through the side sliding groove (9) and is fixedly connected to an adjusting motor (307). The adjusting motor (307) is fixedly installed on the side wall of the positioning base (1).

4. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 3, characterized in that: Position sensors (308) are embedded on one side of the end of the first lever cylinder (301) and the second lever cylinder (304), and soft rubber stickers (309) are fixedly installed on one side of the end of the first lever cylinder (301) and the second lever cylinder (304).

5. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 4, characterized in that: The plate positioning frame (2) includes a main beam frame (201) and a support leg (202). The upper surface of the positioning base (1) is provided with a support groove that cooperates with the support leg (202). The support leg (202) is inserted into the support groove. The negative pressure component (4) includes a negative pressure pump (401) and a negative pressure pipe (402). The negative pressure pump (401) is fixedly installed on the lower surface of the positioning base (1). The negative pressure pipe (402) is connected to the negative pressure pump (401), and one end of the negative pressure pipe (402) extends into the support groove and is embedded in the support leg (202). The support leg (202) is provided with a head groove for accommodating a negative pressure head (5). The negative pressure head (5) is fixedly installed at the end of the head groove.

6. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 5, characterized in that: A fixing member (10) is provided on one side of the support leg (202). The fixing member (10) includes a fixing frame (1001). The fixing frame (1001) is fixedly connected to the positioning base (1). A plug-in frame (1002) is slidably inserted into the fixing frame (1001). One end of the plug-in frame (1002) is inserted into the support leg (202). A fixing spring (1003) is sleeved on the plug-in frame (1002). One end of the fixing spring (1003) is fixedly connected to the fixing frame (1001), and the other end is fixedly connected to a pressure plate. The pressure plate is slidably sleeved on the plug-in frame (1002).

7. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 6, characterized in that: The dynamic micro-cooling component (6) also includes a drive motor (602), which is fixedly installed at the middle of one end of the plate positioning frame (2). A drive screw (603) is fixedly installed at the output end of the drive motor (602). The water-cooled slider (601) has a hollow structure inside and a threaded hole is provided on the water-cooled slider (601). The water-cooled slider (601) is threadedly connected to the drive screw (603) through the threaded hole. The dynamic micro-cooling component (6) also includes a micro water tank (604). A circulating water pump (605) is provided inside the micro water tank (604). The circulating water pump (605) is connected to the water-cooled slider (601) through a conduit.

8. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 7, characterized in that: The plate cooling component (7) includes multiple flat sliding frames (701) symmetrically arranged on both sides of the middle part of the plate positioning frame 2. Multiple sliding grooves are symmetrically and evenly opened on the plate positioning frame (2) along its length direction. The flat sliding frames (701) are slidably engaged in the sliding grooves. The plate cooling component (7) also includes a pipe (702). The pipe (702) is used to connect multiple flat sliding frames (701). The pipe (702) is a rubber hose. A cooling box (703) is symmetrically arranged on the lower surface of the positioning base (1). A circulation pump (704) is arranged in the cooling box (703). The output end of the circulation pump (704) is connected to the pipe (702).

9. The high-speed friction stir welding clamping device for magnesium alloy thin plates according to claim 8, characterized in that: The plate positioning frame (2) has slide rods (705) fixedly installed on both sides of the middle part, with the same number and corresponding positions as the flat sliding frame 701. One end of the flat sliding frame (701) is sleeved on the slide rod (705), and a return spring (706) is sleeved on the slide rod (705). One end of the return spring (706) is fixedly connected to the flat sliding frame (701), and the other end of the return spring (706) is fixedly connected to the side wall of the plate positioning frame (2).

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