A dual-shoulder friction stir welding-milling integrated tool

Abstract

The present application relates to the technical field of friction welding, in particular to a double-shoulder friction welding and milling integrated tool, which comprises an operation plate, a fixing assembly is installed on the top of the operation plate, a support frame is fixedly connected to the top of the operation plate, a welding mechanism is installed in the support frame, a cooling mechanism is installed in the support frame, the cooling mechanism is located at the rear end of the welding mechanism, a welding and milling mechanism is installed in the support frame, and the welding and milling mechanism is located between the support frame and the cooling mechanism; the welding mechanism comprises a driving motor, a driving shaft, a stirring head and a first gear. The present application solves the problem of welding heat dissipation by setting the cooling mechanism, guarantees the joint quality and tool life, realizes effective steel fixation and convenient operation through the fixing assembly, improves the equipment compatibility, machining precision, operation convenience and product quality, and improves the welding stability, reliability and production efficiency as a whole, reduces the cost and risk, and has significant comprehensive advantages.

Description

Technical Field

[0001] This invention relates to the field of friction welding technology, and in particular to a dual-shoulder friction stir welding and milling integrated tool. Background Technology

[0002] With social development, friction stir welding is becoming increasingly crucial in the industrial manufacturing field. Biaxial shoulder friction stir welding, in particular, plays an important role in many high-end manufacturing industries such as aerospace, automobile manufacturing, and shipbuilding due to its unique advantages. Biaxial shoulder friction stir welding can achieve high-quality welded joints, effectively improve the overall performance and reliability of structural components, reduce structural weight, and thus improve the fuel efficiency and flight performance of aircraft.

[0003] Chinese invention patent CN113997075B discloses a dual-shoulder friction stir welding and milling integrated tool. The tool includes: a frame with an adjustment component mounted on it, and a fixedly connected mounting frame below the adjustment component, containing a power motor and a rotating head; and a cleaning component mounted on the mounting frame. This invention provides a dual-shoulder friction stir welding and milling integrated tool where the cleaning motor drives both coarse and fine cleaning cylinders to rotate simultaneously via drive and transmission gears. The coarse cleaning cylinder first cuts away the sharp barbs, while the fine cleaning cylinder grinds the cut weld seam, thus completing the cleaning of barbs on both sides of the weld seam of the metal plate. This not only reduces the difficulty for later workers but also significantly reduces the risk of workers' fingers being cut by welding barbs.

[0004] However, the aforementioned patent does not directly dissipate heat during the welding process, which can lead to excessively high temperatures in the welding area. On one hand, excessively high temperatures may alter the microstructure of the weld joint, such as grain growth, thereby reducing the joint's strength and toughness and affecting weld quality. This is especially problematic for high-end applications with stringent mechanical performance requirements, such as welding aero-engine blades, where even minor performance degradation can trigger serious safety hazards. On the other hand, sustained high temperatures also accelerate the wear and tear on welding tools, shorten their lifespan, increase production costs and equipment maintenance frequency, reduce production efficiency, and are detrimental to the needs of large-scale industrial production. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a dual-shoulder friction stir welding and milling integrated tool.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a dual-shoulder friction stir welding and milling integrated tool, comprising an operating plate, a fixing component mounted on the top of the operating plate, a support frame fixedly connected to the top of the operating plate, a welding mechanism installed inside the support frame, a cooling mechanism installed inside the support frame, the cooling mechanism being located at the rear end of the welding mechanism, and a welding and milling mechanism installed inside the support frame, the welding and milling mechanism being located between the support frame and the cooling mechanism;

[0007] The welding mechanism includes a drive motor, a drive shaft, a stirring head, and a first gear. The drive motor is fixedly installed inside the support frame and located at the top of the operating plate. The drive shaft is fixedly installed at the bottom of the drive motor. The stirring head is fixedly installed on the outer wall of the drive shaft. The first gear is fixedly connected to the outer wall of the first gear.

[0008] The cooling mechanism includes a sealing cover, a first rotating shaft, a blade, a second gear, a conical air inlet block, and a conical air outlet block. The sealing cover is fixedly installed inside the support frame and located at the top of the operating panel. The first rotating shaft is movably installed inside the sealing cover. The blade is fixedly connected to the outer wall of the first rotating shaft and located inside the sealing cover. The second gear is fixedly connected to the outer wall of the first rotating shaft and meshes with the drive shaft. The conical air inlet block is fixedly connected to the air inlet end of the sealing cover. Two conical air outlet blocks are fixedly connected to the air outlet end of the sealing cover. The two conical air outlet blocks are located at the upper and lower ends of the operating panel in sequence.

[0009] Furthermore, the cooling mechanism also includes an air inlet pipe and an air outlet pipe. The air inlet pipe is fixedly connected between the sealing cover and the conical air inlet block. The air inlet end of the air outlet pipe is fixedly connected to the air outlet end of the sealing cover. The air outlet end of the air outlet pipe is fixedly connected to two air outlet pipes, and the two air outlet pipes are fixedly connected to two conical air outlet blocks.

[0010] Further: The fixing assembly includes a bidirectional lead screw, a clamping block, ear plates, a roller, a throttle, and a slide rod. The bidirectional lead screw is movably mounted on the bottom of the operating plate. Two clamping blocks are slidably mounted on the top of the operating plate. Two ear plates are fixedly connected to the bottom ends of the clamping blocks. Multiple rollers are movably mounted inside the clamping blocks. The slide rod is fixedly connected to the bottom end of the operating plate away from the bidirectional lead screw. The ear plate near the bidirectional lead screw has a screw hole inside, and the ear plate near the slide rod has a sliding hole inside. The throttle is fixedly connected to the outer wall of the bidirectional lead screw.

[0011] Further: The welding and milling mechanism includes a sleeve, a second rotating shaft, a cleaning cylinder, a limiting block, a limiting rod, a spring, and a baffle. Two sleeves are fixedly installed inside the support frame and located at the upper and lower ends of the operating plate. The sleeve is located at the rear end of the drive shaft. The second rotating shaft is slidably installed inside the sleeve. The cleaning cylinder is fixedly connected to the outer wall of the second rotating shaft. Two limiting blocks are fixedly connected to both sides of the outer wall of the sleeve. Two limiting rods are fixedly connected to both sides of the outer wall of the cleaning cylinder. The limiting rods are slidably installed inside the limiting blocks. The spring is fixedly installed between the sleeve and the cleaning cylinder. The baffle is fixedly connected to the end of the second rotating shaft away from the cleaning cylinder.

[0012] Furthermore, the welding and milling mechanism also includes a third gear, a belt groove, a support shaft, a pulley, and a drive belt. The third gear is fixedly connected to the outer wall of the top sleeve and meshes with the first gear. The belt groove is opened on the outer wall of the sleeve. The support shaft is movably installed inside the support frame and located on the outer wall of the operating plate. There are two pulleys fixedly connected to the upper and lower ends of the support shaft. There are two drive belts that are sequentially fixedly installed between the upper belt groove and the pulley and between the lower belt groove and the pulley.

[0013] Further: The support frame includes a support rod, a first mounting base, a second mounting base, and bearings. Two support rods are fixedly connected to the upper and lower ends of the operating plate. The first mounting base is fixedly installed inside the support rod, and the second mounting base is fixedly connected to the outer wall of the operating plate. Three bearings are fixedly installed inside the top first mounting base, and two bearings are fixedly installed inside the bottom first mounting base. A first bearing is fixedly installed inside the second mounting base. The first rotating shaft is fixedly installed in the bearing inside the top first mounting base. The drive shaft and sleeve are fixedly installed in the bearings inside the upper and lower first mounting bases, and the support shaft is fixedly installed in the bearing inside the second mounting base.

[0014] Furthermore, the support frame also includes connecting rods, two of which are fixedly connected to the top of the first mounting base. The sealing cover is fixedly connected to the top of the connecting rods, and the drive motor is fixedly mounted on the top of the first mounting base.

[0015] Furthermore, the operation panel has a slot inside, and the welding mechanism, cooling mechanism and welding and milling mechanism are all located inside the slot.

[0016] Furthermore, the bottom of the operating panel is fixedly connected to a support leg, and there are four support legs arranged in a rectangular pattern.

[0017] The present invention has the following beneficial effects:

[0018] 1. Compared with existing technologies, this method, by setting up a drive shaft, a first gear, and a cooling mechanism, enables the first rotating shaft to rotate at high speed through the meshing of the first and second gears when the drive shaft rotates. This, in turn, causes the blades to rotate, generating negative pressure within the sealed cover. Outside air is drawn in through the conical air inlet block and then discharged through the exhaust pipe and conical exhaust block, blowing air to the top and bottom ends of the steel for heat dissipation. This effectively removes the heat generated during welding, preventing joint deterioration and excessive tool wear caused by excessively high welding temperatures. This ensures welding quality, extends tool life, and improves production efficiency. It effectively solves the heat dissipation problem during welding, meeting the stringent requirements of high-end manufacturing for welding quality and stability. It also addresses the problems of existing technologies lacking direct heat dissipation measures during welding, leading to decreased weld joint quality, accelerated tool wear, and reduced production efficiency. This improves welding stability and reliability, reduces production costs and safety risks, and provides a strong guarantee for high-quality welding production.

[0019] 2. Compared with existing technologies, by setting up a fixing component, during use, rotating the handle on the bidirectional lead screw causes the two clamping blocks to move closer or further apart under the guidance of the slide rod. The steel is clamped on both sides by rollers within the clamping blocks, which can both clamp the steel and not hinder its parallel forward and backward movement. This design can quickly and stably fix steel of different widths, ensuring accurate steel positioning during welding and subsequent processing, avoiding impacts on welding quality and processing accuracy due to steel displacement. It also improves the equipment's operational convenience and adaptability, making it suitable for processing various specifications of steel, optimizing the entire welding process, and improving production efficiency and product quality. Attached Figure Description

[0020] Figure 1 This is a first-view structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the second perspective structure of the present invention;

[0022] Figure 3 This is an exploded view of the fixing component in this invention;

[0023] Figure 4 This is an enlarged structural schematic diagram of the welding mechanism and cooling mechanism in this invention;

[0024] Figure 5 This is an enlarged structural schematic diagram of the welding mechanism and the welding and milling mechanism in this invention;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of some parts of the welding and milling mechanism in this invention;

[0026] Figure 7 This is an enlarged structural schematic diagram of the support frame in this invention;

[0027] Figure 8 for Figure 7 Enlarged structural diagram at point A in the middle;

[0028] Figure 9 for Figure 7 Enlarged structural diagram at point B.

[0029] Legend:

[0030] 1. Control panel; 101. Slot; 2. Fixing assembly; 201. Two-way lead screw; 202. Clamping block; 203. Ear plate; 204. Roller; 205. Throttle; 206. Slide rod; 3. Support frame; 301. Support rod; 302. First mounting base; 303. Second mounting base; 304. Bearing; 305. Connecting rod; 4. Welding mechanism; 401. Drive motor; 402. Drive shaft; 403. Stirring head; 404. First gear; 5. Cooling mechanism; 501. Sealing cover; 5 02. First rotating shaft; 503. Blade; 504. Second gear; 505. Air inlet pipe; 506. Conical air inlet block; 507. Exhaust pipe; 508. Conical exhaust block; 6. Welding and milling mechanism; 601. Sleeve; 602. Third gear; 603. Second rotating shaft; 604. Cleaning cylinder; 605. Limiting block; 606. Limiting rod; 607. Spring; 608. Baffle; 609. Belt groove; 610. Support shaft; 611. Pulley; 612. Drive belt; 7. Support leg. Detailed Implementation

[0031] Reference Figure 1-9This invention provides a dual-shoulder friction stir welding and milling integrated tool: It includes an operation plate 1, which serves as the basic support platform for the entire tool. A fixing component 2 is mounted on the top of the operation plate 1 to fix the steel to be welded, ensuring its stability during processing. A support frame 3 is fixedly connected to the top of the operation plate 1. A welding mechanism 4 is installed inside the support frame 3, which is the core component for achieving friction stir welding of the steel. A cooling mechanism 5 is installed inside the support frame 3, located at the rear end of the welding mechanism 4. The cooling mechanism 5 is responsible for dissipating heat from the steel during welding, preventing overheating and affecting welding quality and performance. A welding and milling mechanism 6 is installed inside the support frame 3. The milling mechanism 6 is located between the support frame 3 and the cooling mechanism 5. The welding milling mechanism 6 is used to clean the welding slag generated during the welding process and can perform certain milling operations. The welding mechanism 4 includes a drive motor 401, a drive shaft 402, a stirring head 403, and a first gear 404. The drive motor 401 is fixedly installed inside the support frame 3 and located on top of the operating plate 1, capable of stably driving the stirring head 403 to rotate at high speed. The drive shaft 402 is fixedly installed at the bottom of the drive motor 401, and the drive shaft 402 is tightly connected to the output shaft of the drive motor 401 to ensure efficient power transmission. The stirring head 403 is fixedly installed on the outer wall of the drive shaft 402. The stirring head 403 generates sufficient friction and heat during rotation, effectively... In the friction stir welding of steel, the first gear 404 is fixedly connected to the outer wall of the first gear 404. The first gear 404 is used to transmit power and cooperate with other gears to achieve the coordinated work of different mechanisms. The cooling mechanism 5 includes a sealing cover 501, a first rotating shaft 502, a blade 503, a second gear 504, a conical air inlet block 506, and a conical air outlet block 508. The sealing cover 501 is fixedly installed inside the support frame 3 and located on the top of the operating plate 1 to prevent air leakage and ensure the stability of the internal negative pressure environment. The first rotating shaft 502 is movably installed inside the sealing cover 501. The blade 503 is fixedly connected to the first rotating shaft 504. The outer wall of the rotating shaft 502 is located inside the sealing cover 501. The shape and angle of the blade 503 can effectively generate negative pressure when rotating. The second gear 504 is fixedly connected to the outer wall of the first rotating shaft 502 and meshes with the drive shaft 402. Power transmission is achieved through gear meshing. The conical air inlet block 506 is fixedly connected to the air inlet end of the sealing cover 501. The structure of the conical air inlet block 506 is conducive to guiding the outside air into the sealing cover 501 smoothly. There are two conical exhaust blocks 508 fixedly connected to the air outlet end of the sealing cover 501. The two conical exhaust blocks 508 are located at the upper and lower ends of the operating plate 1 in sequence. The conical exhaust blocks 508 can accurately blow the cooled air to the upper and lower ends of the steel to achieve efficient heat dissipation.

[0032] The cooling mechanism 5 also includes an air inlet pipe 505 and an air outlet pipe 507. The air inlet pipe 505 is fixedly connected between the sealing cover 501 and the conical air inlet block 506 to ensure that air can smoothly enter the sealing cover 501. The air inlet end of the air outlet pipe 507 is fixedly connected to the air outlet end of the sealing cover 501. The air outlet end of the air outlet pipe 507 is fixedly connected to two air outlet pipes. The two air outlet pipes are fixedly connected to two conical exhaust blocks 508. The connection between the air outlet pipe 507 and the air outlet pipes is tight to ensure that the cooling air can be accurately delivered to the conical exhaust blocks 508.

[0033] The fixing assembly 2 includes a bidirectional lead screw 201, a clamping block 202, ear plates 203, a roller 204, a throttle 205, and a slide bar 206. The bidirectional lead screw 201 is movably mounted on the bottom of the operating plate 1 to achieve precise movement of the clamping block 202. Two clamping blocks 202 are slidably mounted on the top of the operating plate 1. Two ear plates 203 are fixedly connected to the bottom ends of the clamping block 202. The ear plates 203 are used to connect the bidirectional lead screw 201 and the slide bar 206. Multiple rollers 204 are movably mounted inside the clamping block 202, enabling the steel to be clamped... While holding the clamping block 202, it can move smoothly back and forth in parallel. The slide bar 206 is fixedly connected to the bottom of the end of the operating plate 1 away from the double-acting screw 201. The slide bar 206 provides a stable guide for the movement of the clamping block 202. The ear plate 203 on the side near the double-acting screw 201 has a screw hole inside. The clamping block 202 can be moved by cooperating with the double-acting screw 201 through the screw hole. The ear plate 203 on the side near the slide bar 206 has a sliding hole inside. The throttle 205 is fixedly connected to the outer wall of the double-acting screw 201, which makes it convenient for the operator to manually operate the double-acting screw 201.

[0034] The welding and milling mechanism 6 includes a sleeve 601, a second rotating shaft 603, a cleaning cylinder 604, a limiting block 605, a limiting rod 606, a spring 607, and a baffle 608. Two sleeves 601 are fixedly installed inside the support frame 3 and located at the upper and lower ends of the operating plate 1. The sleeve 601 provides a mounting base and rotational support for the second rotating shaft 603 and the cleaning cylinder 604. The sleeve 601 is located at the rear end of the drive shaft 402. The second rotating shaft 603 is slidably installed inside the sleeve 601, allowing it to move stably up and down within the sleeve 601. The cleaning cylinder 604 is fixedly connected to the outer wall of the second rotating shaft 603. The material and surface shape of the cleaning cylinder 604 effectively clean welding slag. Two positioning blocks 605 are fixedly connected to both sides of the outer wall of the sleeve 601. The limiting blocks 605 are used to limit the movement range of the limiting rods 606. Two limiting rods 606 are fixedly connected to both sides of the outer wall of the cleaning cylinder 604. The limiting rods 606 are slidably installed inside the limiting blocks 605. The limiting rods 606 and the limiting blocks 605 cooperate to realize the positioning and movement of the cleaning cylinder 604. The spring 607 is fixedly installed between the sleeve 601 and the cleaning cylinder 604. The spring 607 provides elastic force, enabling the cleaning cylinder 604 to adapt to steel of different thicknesses. The baffle 608 is fixedly connected to the end of the second rotating shaft 603 away from the cleaning cylinder 604. The baffle 608 is used to prevent the second rotating shaft 603 from coming out of the sleeve 601.

[0035] The welding and milling mechanism 6 also includes a third gear 602, a belt groove 609, a support shaft 610, a pulley 611, and a drive belt 612. The third gear 602 is fixedly connected to the outer wall of the top sleeve 601 and meshes with the first gear 404, transmitting power through gear meshing. The belt groove 609 is opened on the outer wall of the sleeve 601. The support shaft 610 is movably installed inside the support frame 3 and located on the outer wall of the operating plate 1. There are two pulleys 611 fixedly connected to the upper and lower ends of the support shaft 610. There are two drive belts 612 fixedly installed sequentially between the upper belt groove 609 and the pulley 611 and between the lower belt groove 609 and the pulley 611. The power transmission of the bottom sleeve 601 is realized through belt drive, so that the upper and lower cleaning cylinders 604 can rotate synchronously.

[0036] The support frame 3 includes a support rod 301, a first mounting base 302, a second mounting base 303, and a bearing 304. The support rod 301 is fixedly connected to the upper and lower ends of the operating plate 1. The first mounting base 302 is fixedly installed inside the support rod 301, and the second mounting base 303 is fixedly connected to the outer wall of the operating plate 1. The mounting bases provide installation positions for the bearings 304. Three bearings 304 are fixedly installed inside the top first mounting base 302, and two bearings 304 are fixedly installed inside the bottom first mounting base 302. The first bearing 304 is fixedly installed inside the second mounting base 303. The first rotating shaft 502 is fixedly installed in the bearing 304 inside the top first mounting base 302. The drive shaft 402 and the sleeve 601 are fixedly installed in the bearings 304 inside the upper and lower first mounting bases 302. The support shaft 610 is fixedly installed in the bearing 304 inside the second mounting base 303. The bearings 304 ensure the flexible rotation of each shaft and reduce friction and wear.

[0037] The support frame 3 also includes a connecting rod 305, which is used to connect the sealing cover 501 and the first mounting base 302. The connecting rod 305 has two fixed connections to the top of the first mounting base 302. The sealing cover 501 is fixedly connected to the top of the connecting rod 305. The drive motor 401 is fixedly mounted on the top of the first mounting base 302.

[0038] The operating panel 1 has a slot 101 inside, and the welding mechanism 4, cooling mechanism 5 and welding and milling mechanism 6 are all located inside the slot 101. The size and shape of the slot 101 can accommodate the welding mechanism 4, cooling mechanism 5 and welding and milling mechanism 6. The fact that the welding mechanism 4, cooling mechanism 5 and welding and milling mechanism 6 are all located inside the slot 101 makes the entire tool structure compact.

[0039] The bottom of the control panel 1 is fixedly connected to a support leg 7. There are four support legs 7 arranged in a rectangle. The support legs 7 can stably support the control panel 1, so that the tool remains stable when working.

[0040] Working principle: When in use, place two steel pieces flat on the top of the operating plate 1, align the butt joints of the two steel pieces and position them at the center line of the operating plate 1, and then control the bidirectional lead screw 201 to rotate by the throttle 205, so that the two clamping blocks 202 move closer to each other. The two steel pieces are clamped on both sides by the roller drawers 204 inside the two clamping blocks 202. Because of the setting of the roller drawers 204, the two steel pieces can be clamped without affecting the parallel movement of the steel pieces back and forth.

[0041] Next, the drive motor 401 is turned on, which drives the drive shaft 402 to rotate, and at the same time drives the stirring head 403 to rotate at high speed. Then, the steel plate is moved, and the two steel pieces are stirred and welded together by the stirring head 403.

[0042] While the drive shaft 402 rotates, the first gear 404 and the sleeve 601 work together to drive the top sleeve 601 to rotate at high speed. At the same time, through the connection between the limit block 605 and the limit rod 606, the top cleaning cylinder 604 rotates to clean the welding slag on the top of the steel.

[0043] When the top sleeve 601 rotates, the rotational power is transmitted to the bottom sleeve 601 through the cooperation of the belt groove 609, the support shaft 610, the pulley 611 and the drive belt 612, so that the bottom cleaning cylinder 604 rotates synchronously to clean the welding slag on the bottom of the steel plate.

[0044] In order to allow the two cleaning cylinders 604 to adapt to steel plates of different thicknesses, through the elastic cooperation of the spring 607 and the limiting cooperation of the limiting block 605 and the limiting rod 606, the two cleaning cylinders 604 can be tightly attached to the upper and lower ends of the steel plate when welding steel plates of different thicknesses.

[0045] While the drive shaft 402 rotates, the first rotating shaft 502 is driven to rotate at high speed through the cooperation of the first gear 404 and the second gear 504. At the same time, the blade 503 is driven to rotate, which creates a negative pressure inside the sealing cover 501. Then, outside air is drawn into the sealing cover 501 through the conical air inlet block 506. After that, the air is discharged from the two conical air outlet blocks 508 after passing through the exhaust pipe 507, blowing air to the upper and lower ends of the steel to dissipate heat.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-shoulder friction stir welding and milling integrated tool, comprising an operation plate (1), characterized in that: A fixing component (2) is installed on the top of the operating plate (1), and a support frame (3) is fixedly connected to the top of the operating plate (1). A welding mechanism (4) is installed inside the support frame (3), and a cooling mechanism (5) is installed inside the support frame (3). The cooling mechanism (5) is located at the rear end of the welding mechanism (4). A welding and milling mechanism (6) is installed inside the support frame (3), and the welding and milling mechanism (6) is located between the support frame (3) and the cooling mechanism (5). The welding mechanism (4) includes a drive motor (401), a drive shaft (402), a stirring head (403), and a first gear (404). The drive motor (401) is fixedly installed inside the support frame (3) and located at the top of the operating plate (1). The drive shaft (402) is fixedly installed at the bottom of the drive motor (401). The stirring head (403) is fixedly installed on the outer wall of the drive shaft (402). The first gear (404) is fixedly connected to the outer wall of the first gear (404). The cooling mechanism (5) includes a sealing cover (501), a first rotating shaft (502), a blade (503), a second gear (504), a conical air inlet block (506), and a conical air outlet block (508). The sealing cover (501) is fixedly installed inside the support frame (3) and located at the top of the operating plate (1). The first rotating shaft (502) is movably installed inside the sealing cover (501). The blade (503) is fixedly connected to the outer wall of the first rotating shaft (502) and located inside the sealing cover (501). The second gear (504) is fixedly connected to the outer wall of the first rotating shaft (502) and meshes with the drive shaft (402). The conical air inlet block (506) is fixedly connected to the air inlet end of the sealing cover (501). There are two conical air outlet blocks (508) fixedly connected to the air outlet end of the sealing cover (501). The two conical air outlet blocks (508) are located at the upper and lower ends of the operating plate (1) in sequence. The welding and milling mechanism (6) includes a sleeve (601), a second rotating shaft (603), a cleaning cylinder (604), a limiting block (605), a limiting rod (606), a spring (607), and a baffle (608). Two sleeves (601) are fixedly installed inside the support frame (3) and located at the upper and lower ends of the operating plate (1). The sleeve (601) is located at the rear end of the drive shaft (402). The second rotating shaft (603) is slidably installed inside the sleeve (601). The cleaning cylinder (604) is fixed. The limiting blocks (605) are fixedly connected to the outer wall of the second rotating shaft (603), and the limiting rods (606) are fixedly connected to the outer walls of the sleeve (601) and the cleaning cylinder (604). The limiting rods (606) are slidably installed inside the limiting blocks (605). The spring (607) is fixedly installed between the sleeve (601) and the cleaning cylinder (604). The baffle (608) is fixedly connected to the end of the second rotating shaft (603) away from the cleaning cylinder (604). When the top sleeve (601) rotates, the rotational power is transmitted to the bottom sleeve (601) through the cooperation of the belt groove (609), support shaft (610), pulley (611) and drive belt (612), so that the bottom cleaning cylinder (604) rotates synchronously to clean the welding slag on the bottom of the steel plate. In order to allow the two cleaning cylinders (604) to adapt to steel plates of different thicknesses, through the elastic cooperation of the spring (607) and the limiting cooperation of the limiting block (605) and the limiting rod (606), the two cleaning cylinders (604) can be tightly attached to the upper and lower ends of the steel plate when welding steel plates of different thicknesses.

2. The dual-shoulder friction stir welding and milling integrated tool according to claim 1, characterized in that: The cooling mechanism (5) further includes an air inlet pipe (505) and an air outlet pipe (507). The air inlet pipe (505) is fixedly connected between the sealing cover (501) and the conical air inlet block (506). The air inlet end of the air outlet pipe (507) is fixedly connected to the air outlet end of the sealing cover (501). The air outlet end of the air outlet pipe (507) is fixedly connected to two air outlet pipes. The two air outlet pipes are fixedly connected to two conical air outlet blocks (508).

3. The dual-shoulder friction stir welding and milling integrated tool according to claim 1, characterized in that: The fixing assembly (2) includes a bidirectional lead screw (201), a clamping block (202), an ear plate (203), a roller (204), a throttle (205), and a slide rod (206). The bidirectional lead screw (201) is movably installed at the bottom of the operating plate (1). Two clamping blocks (202) are slidably installed at the top of the operating plate (1). Two ear plates (203) are fixedly connected to the bottom ends of the clamping blocks (202). Multiple rollers (204) are movably installed inside the clamping blocks (202). The slide rod (206) is fixedly connected to the bottom end of the operating plate (1) away from the bidirectional lead screw (201). The ear plate (203) on the side closer to the bidirectional lead screw (201) has a screw hole inside, and the ear plate (203) on the side closer to the slide rod (206) has a sliding hole inside. The throttle (205) is fixedly connected to the outer wall of the bidirectional lead screw (201).

4. The dual-shoulder friction stir welding and milling integrated tool according to claim 1, characterized in that: The welding and milling mechanism (6) also includes a third gear (602), a belt groove (609), a support shaft (610), a pulley (611), and a drive belt (612). The third gear (602) is fixedly connected to the outer wall of the top sleeve (601) and meshes with the first gear (404). The belt groove (609) is opened on the outer wall of the sleeve (601). The support shaft (610) is movably installed inside the support frame (3) and located on the outer wall of the operating plate (1). There are two pulleys (611) fixedly connected to the upper and lower ends of the support shaft (610). There are two drive belts (612) fixedly installed sequentially between the upper belt groove (609) and the pulley (611) and between the lower belt groove (609) and the pulley (611).

5. A dual-shoulder friction stir welding and milling integrated tool according to claim 4, characterized in that: The support frame (3) includes a support rod (301), a first mounting base (302), a second mounting base (303), and bearings (304). The support rod (301) has two fixed connections to the upper and lower ends of the operating plate (1). The first mounting base (302) is fixedly installed inside the support rod (301), and the second mounting base (303) is fixedly connected to the outer wall of the operating plate (1). Three bearings (304) are fixedly installed inside the top first mounting base (302), and the bottom first mounting base (304)... 02) has two bearings (304) fixedly installed inside. The second mounting base (303) has a first bearing (304) fixedly installed inside. The first rotating shaft (502) is fixedly installed in the bearing (304) inside the top first mounting base (302). The drive shaft (402) and the sleeve (601) are fixedly installed in the bearings (304) inside the upper and lower first mounting bases (302). The support shaft (610) is fixedly installed in the bearing (304) inside the second mounting base (303).

6. The dual-shoulder friction stir welding and milling integrated tool according to claim 5, characterized in that: The support frame (3) also includes a connecting rod (305), two of which are fixedly connected to the top of the first mounting base (302). The sealing cover (501) is fixedly connected to the top of the connecting rod (305), and the drive motor (401) is fixedly installed on the top of the first mounting base (302).

7. The dual-shoulder friction stir welding and milling integrated tool according to claim 1, characterized in that: The operating panel (1) has a slot (101) inside, and the welding mechanism (4), cooling mechanism (5) and welding and milling mechanism (6) are all located inside the slot (101).

8. A dual-shoulder friction stir welding and milling integrated tool according to claim 1, characterized in that: The bottom of the operating panel (1) is fixedly connected to a support leg (7), and there are four support legs (7) arranged in a rectangular shape.

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