Laser-assisted friction stir additive welding tool

Abstract

The invention relates to the technical field of friction stir welding, in particular to a laser-assisted friction stir additive welding tool which comprises a mounting plate, a lower support is fixedly connected to the bottom of the mounting plate, a rotating sleeve is movably mounted in the mounting plate and the lower support, and a stirring head is fixedly connected to the bottom of the rotating sleeve. A first driving assembly is mounted in the lower support, a laser head is fixedly mounted in the lower support, a mounting cover is mounted in the lower support, a saw blade is movably mounted in the mounting cover, and a second driving assembly is mounted between the first driving assembly and the mounting cover. A raw material rod is movably mounted in the rotating sleeve and the stirring head, the raw material rod penetrates through the rotating sleeve and the stirring head, and an upper support is fixedly connected to the top of the mounting plate. According to the device, when friction stir additive manufacturing is achieved, synchronous precise grooving, laser assistance and automatic and stable material injection are achieved, and the quality and efficiency of additive manufacturing are improved.

Description

Technical Field

[0001] The invention relates to the technical field of friction stir welding, and in particular to a laser-assisted friction stir additive welding tool. Background Art

[0002] With the development of society, friction stir additive technology has gradually emerged in the field of material processing and has played an extremely important role. Friction stir additive technology is an advanced manufacturing technology based on the principle of solid-phase connection. It applies pressure and rotates the stirring head on the material to be processed, and uses the heat generated by friction to soften the material locally, thereby realizing the layer-by-layer stacking and connection of the material, so as to manufacture parts with complex shapes and excellent performance. It not only expands the process boundaries of material processing, but also provides strong technical support for the development of many high-end manufacturing industries, and promotes the manufacturing industry to move towards higher quality and more refined directions.

[0003] Chinese invention patent CN202110184576.8 discloses a laser-assisted friction stir additive welding tool, which has a laser head and a push switch in its shell, and the push switch is electrically connected to the laser head; laser channels are spaced apart on the side walls of the tool handle, and the side walls of the tool handle between two adjacent laser channels are a frame structure; during rotation, a part of the frame structure is suitable for abutting the push switch, thereby turning off the laser head; when the frame structure is separated from the push switch, the laser head emits a laser, thereby assisting in heating the additive material inside the tool handle through the laser channel. The device adopts a fully mechanical structure, which can realize accurate heating of the material by the laser and rapid heating of the material, thereby achieving high-speed friction stir additive manufacturing, and avoiding the defect of incorrect heating of the tool handle caused by loss of steps in the motor system, as well as reducing the control logic of the control system and reducing system redundancy.

[0004] However, in order to further improve the efficiency of stir friction additive, the above patent adds laser assistance. However, relying solely on laser assistance has certain limitations, that is, the laser can only heat the surface material, and cannot effectively heat the inside. This will result in a large temperature difference between the inside and the surface of the material during the additive process, causing the material to be heated unevenly. The internal material may not be able to reach the ideal softening state because it is not fully heated, which in turn affects the fusion effect between it and the adjacent material layers, and is prone to internal defects such as pores and cracks, which reduces the internal quality and overall structural strength of the manufactured parts. Moreover, due to the inconsistent thermal state of the interior and the surface, deformation will occur during the subsequent cooling process due to uneven distribution of thermal stress, affecting the dimensional accuracy and shape accuracy of the parts. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a laser-assisted friction stir additive welding tool.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a laser-assisted friction stir additive welding tool, comprising a mounting plate, a lower bracket is fixedly connected to the bottom of the mounting plate, a rotating sleeve is movably installed inside the mounting plate and the lower bracket, a stirring head is fixedly connected to the bottom of the rotating sleeve, a first driving assembly is installed inside the lower bracket, a laser head is fixedly installed inside the lower bracket, a mounting cover is installed inside the lower bracket, a saw blade is movably installed inside the mounting cover, a second driving assembly is installed between the first driving assembly and the mounting cover, a raw material rod is movably installed inside the rotating sleeve and the stirring head, the raw material rod passes through the rotating sleeve and the stirring head, an upper bracket is fixedly connected to the top of the mounting plate, two symmetrically distributed concave wheels are movably installed inside the upper bracket, the raw material rod is located between the two concave wheels, and a third driving assembly is installed between the first driving assembly and the concave wheels;

[0007] The first driving assembly includes a driving motor, a driving shaft, a rotating shaft, a driving gear and a ring gear. The driving motor is fixedly mounted on the bottom of the mounting plate, the driving shaft is fixedly mounted on the output end of the driving motor, the rotating shaft is fixedly mounted on the bottom of the driving shaft, the driving gear is fixedly connected to the outer wall of the rotating shaft, the ring gear is fixedly connected to the outer wall of the rotating sleeve, and the driving gear and the ring gear are meshed with each other.

[0008] Further: bearings are fixedly installed inside the mounting plate and the lower bracket, and the rotating sleeve is fixedly installed in the inner ring of the bearing.

[0009] Further: the mounting cover includes a first protective cover, a second protective cover and a mounting shaft, the first protective cover is fixedly connected to the inside of the lower bracket, the second protective cover is bolted to the front end of the first protective cover, the mounting shaft is movably installed inside the first protective cover, and the saw blade is fixedly installed on the mounting shaft.

[0010] Further: the rear end of the first protective cover is fixedly connected with a laser channel, the laser head is located on the top of the first protective cover, and the output end of the laser head is aligned with the inside of the laser channel.

[0011] Further: the second driving assembly includes a worm and a worm wheel, the worm is fixedly connected to the bottom of the rotating shaft, the worm wheel is fixedly connected to one end of the mounting shaft, and the worm and the worm wheel are meshed with each other.

[0012] Further: the third driving assembly includes a first bevel gear, a second bevel gear, a first pulley, a second pulley, a driving belt, a toothed disc and a connecting shaft, the first bevel gear is fixedly connected to the outer wall of the rotating shaft and is located on the top of the driving gear, the second bevel gear is movably installed inside the lower bracket and meshes with the first bevel gear, the first pulley is fixedly connected to the outer wall of the second bevel gear, the second pulley is movably installed inside the upper bracket, the driving belt is fixedly installed between the first pulley and the second pulley, the diameter of the first pulley is smaller than the diameter of the second pulley, a plurality of toothed discs are fixedly installed at the front ends of the concave wheel in sequence, the two toothed discs on the same side mesh with each other, and the connecting shaft is fixedly connected between the second pulley and one of the toothed discs.

[0013] Further: the top of the mounting plate is fixedly connected with a connecting frame, and the top of the connecting frame is fixedly installed on the machine tool.

[0014] Further: a slot is provided inside the mounting plate, and the driving belt is located inside the slot.

[0015] The present invention has the following beneficial effects:

[0016] 1. Compared with the prior art, the present invention is provided with a rotating sleeve, a stirring head, a driving motor, a driving shaft, a rotating shaft, a driving gear, a ring gear, a laser head, a mounting shaft, a laser channel, a worm and a worm wheel. When in use, the driving motor is started, the driving motor drives the driving shaft and the rotating shaft to rotate, the driving gear on the rotating shaft is meshed with the ring gear, so that the rotating sleeve drives the stirring head to rotate, and the basic operation of stirring friction material addition is started. The friction heat generated by the stirring head and the material is used to soften and accumulate the material. At the same time, the rotating shaft drives the worm to rotate, the worm is meshed with the worm wheel, and the mounting shaft is driven to rotate, so that the saw blade rotates to cut grooves on the material. The laser generated by the laser head is irradiated to the surface of the material and the groove through the laser channel for auxiliary heating, further optimizing the heating effect of the material and promoting better fusion of the material. The present invention, while stirring friction material addition, cuts grooves on the material, and then cooperates with the laser head for laser assistance, which can realize heat input and distribution control more accurately on the surface of the material and the groove, so that the material is heated more evenly inside and outside, reducing the generation of internal defects, improving the structural strength and manufacturing quality of parts, and ensuring that the product meets high-precision design requirements.

[0017] 2. Compared with the prior art, by setting a rotating sleeve, a stirring head, a rotating shaft, a raw material rod, a concave wheel, a first bevel gear, a second bevel gear, a first pulley, a second pulley, a toothed disc and a connecting shaft, when the rotating shaft rotates, the first bevel gear on the rotating shaft meshes with the second bevel gear, driving the first pulley and the second pulley to rotate in turn, rotating the toothed disc through the connecting shaft, and then driving the concave wheel to rotate, and the concave wheel drives the raw material rod to move through friction, so that the raw material rod is heated by rotation inside the rotating sleeve and the stirring head, softened and then discharged, and continuously provides raw materials for the additive process. The present invention ensures the continuity and stability of material supply, improves the efficiency of additive manufacturing, reduces process interruptions or product quality problems caused by unstable raw material supply, and improves the reliability of the entire manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the first viewing angle of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the second viewing angle of the present invention;

[0020] Figure 3 It is a schematic diagram of the enlarged structure of some parts in the present invention;

[0021] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 5 for Figure 3 A schematic diagram of the structure from another perspective;

[0023] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0024] Figure 7 is an enlarged structural schematic diagram of the third driving component in the present invention;

[0025] Figure 8 It is an enlarged structural schematic diagram of the mounting plate, the lower bracket and the upper bracket in the present invention.

[0026] Legend:

[0027] 1. Mounting plate; 101. Slotting; 2. Lower bracket; 3. Rotating sleeve; 4. Stirring head; 5. First driving assembly; 501. Driving motor; 502. Driving shaft; 503. Rotating shaft; 504. Driving gear; 505. Ring gear; 506. Bearing; 6. Laser head; 7. Mounting cover; 701. First protective cover; 702. Second protective cover; 703. Mounting shaft; 704. Laser channel; 8. Saw blade; 9. Second driving assembly; 901. Worm; 902. Worm wheel; 10. Raw material rod; 11. Upper bracket; 12. Concave wheel; 13. Third driving assembly; 1301. First bevel gear; 1302. Second bevel gear; 1303. First pulley; 1304. Second pulley; 1305. Driving belt; 1306. Toothed disc; 1307. Connecting shaft; 14. Connecting frame. DETAILED DESCRIPTION

[0028] Reference Figure 1-8The present invention provides a laser-assisted friction stir additive welding tool: comprising a mounting plate 1, the mounting plate 1 is the basic bearing component of the entire welding tool, and provides a mounting position for other parts. The bottom of the mounting plate 1 is fixedly connected to a lower bracket 2, and the lower bracket 2 cooperates with the mounting plate 1 to jointly provide a stable accommodation and support space for the parts. A rotating sleeve 3 is movably installed inside the mounting plate 1 and the lower bracket 2. The rotating sleeve 3 stably transmits power to a stirring head 4 to ensure the rotation accuracy and continuity of the stirring head 4. The bottom of the rotating sleeve 3 is fixedly connected to the stirring head 4. The mixing head 4 rotates at high speed and is in close contact with the material to be processed. It uses strong friction to do work, causing the material to quickly heat up and soften locally, and then accumulate and fuse layer by layer to shape the required shape of the parts. The lower bracket 2 is internally installed with a first drive component 5, which is used to drive the rotating sleeve 3 and the mixing head 4 to rotate at high speed. The lower bracket 2 is internally fixed with a laser head 6. When the internal laser generating device is powered on, a high-energy-density laser beam is generated, which is accurately projected to the grooving part of the material to heat and soften it, thereby realizing auxiliary material addition. The mounting cover 7 is used to protect the saw blade 8. The saw blade 8 is movably mounted inside the mounting cover 7. The saw blade 8 makes a groove on the material to increase the heating and fusion area of ​​the material, cooperates with the laser to improve the internal heating effect of the material, and improves the material fusion quality during additive manufacturing. A second driving component 9 is installed between the first driving component 5 and the mounting cover 7 to control the saw blade 8 to rotate for cutting. The raw material rod 10 is movably mounted inside the rotating sleeve 3 and the stirring head 4. The raw material rod 10 is the basic raw material carrier for additive manufacturing and is used to realize product molding. Material basis, raw material rod 10 The raw material rod 10 passes through the rotating sleeve 3 and the stirring head 4. The top of the mounting plate 1 is fixedly connected with an upper bracket 11, and the upper bracket 11 provides an installation and positioning space for the cam 12. Two symmetrically distributed cams 12 are movably installed inside the upper bracket 11. The raw material rod 10 is located between the two cams 12. The cams 12 automatically and smoothly transport the raw material rod 10 to ensure the continuity of raw materials. A third drive component 13 is installed between the first drive component 5 and the cam 12. The third drive component 13 is used to control the stable output of the raw material rod 10;

[0029] The first driving assembly 5 includes a driving motor 501, a driving shaft 502, a rotating shaft 503, a driving gear 504 and a ring gear 505. The driving motor 501 is fixedly mounted on the bottom of the mounting plate 1, the driving shaft 502 is fixedly mounted on the output end of the driving motor 501, the rotating shaft 503 is fixedly mounted on the bottom of the driving shaft 502, the driving gear 504 is fixedly connected to the outer wall of the rotating shaft 503, the ring gear 505 is fixedly connected to the outer wall of the rotating sleeve 3, and the driving gear 504 and the ring gear 505 are meshed with each other. When the first driving assembly 5 is used, the driving motor 501 is started, and the driving motor 501 starts The drive shaft 502 is in operation, converting electrical energy into mechanical energy. The output torque drives the drive shaft 502 to rotate. The drive shaft 502 further drives the rotating shaft 503 fixedly connected thereto to rotate synchronously. The drive gear 504 on the outer wall of the rotating shaft 503 rotates together with the rotating shaft 503. Since the drive gear 504 and the ring gear 505 are meshed with each other, according to the gear transmission principle, the rotational motion of the drive gear 504 is transmitted to the ring gear 505, thereby driving the rotating sleeve 3 to rotate. The rotating sleeve 3 in turn drives the stirring head 4 fixedly connected to its bottom to rotate. The stirring head 4 generates heat through friction with the material to be processed, so as to soften the material, thereby realizing the basic action of friction stirring additive.

[0030] The mounting plate 1 and the lower bracket 2 are both fixedly mounted with bearings 506 . The bearings 506 are provided to support the rotating sleeve 3 and reduce its rotational friction. The rotating sleeve 3 is fixedly mounted in the inner ring of the bearing 506 .

[0031] The mounting cover 7 includes a first protective cover 701, a second protective cover 702 and a mounting shaft 703. The first protective cover 701 is fixedly connected to the inside of the lower bracket 2. The first protective cover 701 constructs a relatively closed space to accommodate the saw blade 8, the mounting shaft 703 and other components to isolate external dust and prevent it from interfering with the operation of the saw blade 8. The second protective cover 702 is bolted to the front end of the first protective cover 701. The second protective cover 702 enhances the overall protective sealing, is easy to disassemble, and is conducive to rapid maintenance and replacement of the saw blade 8. The mounting shaft 703 is movably installed in the inside of the first protective cover 701. The saw blade 8 is fixedly installed on the mounting shaft 703. One end of the saw blade 8 fixes the saw blade 8 to receive the rotational power transmitted by the second drive assembly 9, drive the saw blade 8 to rotate at high speed around the axis, and ensure that the saw blade 8 cuts smoothly.

[0032] The rear end of the first protective cover 701 is fixedly connected to a laser channel 704. The laser head 6 is located on the top of the first protective cover 701. The output end of the laser head 6 is aligned with the inside of the laser channel 704. The laser emitted by the laser head 6 provides a directional transmission channel to ensure that the laser can accurately irradiate the material part that needs to be processed.

[0033] The second drive assembly 9 includes a worm 901 and a worm wheel 902. The worm 901 is fixedly connected to the bottom of the rotating shaft 503, and the worm wheel 902 is fixedly connected to one end of the mounting shaft 703. The worm 901 and the worm wheel 902 are meshed with each other. When the rotating shaft 503 rotates, the worm 901 fixed to the bottom of the rotating shaft 503 rotates synchronously. Since the worm 901 and the worm wheel 902 are meshed with each other, according to the worm transmission principle, the rotational motion of the worm 901 is transmitted to the worm wheel 902, so that the worm wheel 902 drives the mounting shaft 703 fixedly connected thereto to rotate, and then drives the saw blade 8 installed on the mounting shaft 703 to rotate, so that the saw blade 8 performs a grooving operation on the material, and optimizes the processing technology through cooperation with the stir friction additive process and laser assistance.

[0034] The third driving assembly 13 includes a first bevel gear 1301, a second bevel gear 1302, a first pulley 1303, a second pulley 1304, a toothed disc 1305, a driving belt 1306 and a connecting shaft 1307. The first bevel gear 1301 is fixedly connected to the outer wall of the rotating shaft 503 and is located at the top of the driving gear 504. The second bevel gear 1302 is movably installed in the interior of the lower bracket 2 and meshes with the first bevel gear 1301. The first bevel gear 1301 meshes with the second bevel gear 1302 to receive the rotation of the driving gear 504 and convert the power direction. The first bevel gear 1303 is rotated and fixedly connected to the outer wall of the second bevel gear 1302. The first pulley 1303 transmits the power transmitted from the bevel gear through the belt. The second pulley 1304 is movably installed in the interior of the upper bracket 11. The second pulley 1304 converts and transmits the power transmitted from the belt to adapt to the driving requirements of the cam 12. The driving belt 1305 is fixedly installed between the first pulley 1303 and the second pulley 1304, and transmits the power of the first pulley 1303 to the second pulley 1304 without loss and smoothly, so as to adapt to the vibration of equipment operation and the relative displacement of components. The diameter of the first pulley 1303 is smaller than the diameter of the second pulley 1304. Since the diameter of the first pulley 1303 is smaller than the diameter of the second pulley 1304, variable speed transmission can be realized. A plurality of toothed discs 1306 are fixedly installed at the front ends of the cam 12 in sequence, and the two toothed discs 1306 on the same side are meshed with each other. The toothed discs 1306 on the same side are meshed with each other, and receive the power from the connecting shaft 1307 to drive the cam 12 to rotate synchronously. The connecting shaft 1307 is fixedly connected between the second pulley 1304 and one of the toothed discs 1306, connecting the pulley and the toothed disc transmission, realizing seamless power connection, opening up the complete driving link of the cam 12, and ensuring sufficient power for raw material transportation.

[0035] The top of the mounting plate 1 is fixedly connected with a connecting frame 14, the top of the connecting frame 14 is connected to the machine tool, and the bottom of the connecting frame 14 is rigidly connected to the mounting plate 1. With its own stable structure, the stability of the machine tool work surface is transmitted to the welding tool, absorbing and buffering the vibration and impact during the processing, and ensuring the constant position of the welding tool.

[0036] A slot 101 is provided inside the mounting plate 1 , and the driving belt 1305 is located inside the slot 101 . The slot 101 provides a suitable installation space for the driving belt 1305 , so that the driving belt 1305 can be arranged and operated normally in the slot 101 .

[0037] Working principle: When in use, first fix it on the machine tool through the connecting frame 14 to ensure that the whole device is in a stable state. Then, place the raw material rod 10 inside the rotating sleeve 3 and the stirring head 4 and make it located between the two concave wheels 12.

[0038] Then, the driving motor 501 is started, and the driving motor 501 drives the driving shaft 502 and the rotating shaft 503 to rotate. The driving gear 504 on the rotating shaft 503 meshes with the ring gear 505, so that the rotating sleeve 3 drives the stirring head 4 to rotate, and the basic operation of stirring friction additive is started, and the friction between the stirring head 4 and the material generates heat to soften and accumulate the material.

[0039] At the same time, the rotating shaft 503 drives the worm 901 to rotate, and the worm 901 meshes with the worm wheel 902, driving the mounting shaft 703 to rotate, so that the saw blade 8 rotates to cut grooves on the material. The laser generated by the laser head 6 is irradiated to the surface of the material and the groove through the laser channel 704 for auxiliary heating, further optimizing the heating effect of the material and promoting better fusion of the material.

[0040] In addition, the first bevel gear 1301 on the rotating shaft 503 is meshed with the second bevel gear 1302, which drives the first pulley 1303 and the second pulley 1304 to rotate in turn, and the toothed disc 1306 is rotated through the connecting shaft 1307, thereby driving the cam 12 to rotate. The cam 12 drives the raw material rod 10 to move through friction, so that the raw material rod 10 is rotated and heated inside the rotating sleeve 3 and the stirring head 4, softened, and then discharged, continuously providing raw materials for the additive process.

[0041] Finally, it should be noted that the above 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 aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser-assisted friction stir additive welding tool, comprising a mounting plate (1), characterized in that: The bottom of the mounting plate (1) is fixedly connected to a lower bracket (2); a rotating sleeve (3) is movably mounted inside the mounting plate (1) and the lower bracket (2); a stirring head (4) is fixedly connected to the bottom of the rotating sleeve (3); a first driving assembly (5) is mounted inside the lower bracket (2); a laser head (6) is fixedly mounted inside the lower bracket (2); a mounting cover (7) is mounted inside the lower bracket (2); a saw blade (8) is movably mounted inside the mounting cover (7); the first driving assembly (5) and the mounting cover (7) are connected to each other. ), a second driving assembly (9) is installed between the rotating sleeve (3) and the stirring head (4), a raw material rod (10) is movably installed inside the rotating sleeve (3) and the stirring head (4), the raw material rod (10) passes through the rotating sleeve (3) and the stirring head (4), an upper bracket (11) is fixedly connected to the top of the mounting plate (1), two symmetrically distributed concave wheels (12) are movably installed inside the upper bracket (11), the raw material rod (10) is located between the two concave wheels (12), and a third driving assembly (13) is installed between the first driving assembly (5) and the concave wheel (12); The first driving assembly (5) comprises a driving motor (501), a driving shaft (502), a rotating shaft (503), a driving gear (504) and a ring gear (505); the driving motor (501) is fixedly mounted on the bottom of the mounting plate (1); the driving shaft (502) is fixedly mounted on the output end of the driving motor (501); the rotating shaft (503) is fixedly mounted on the bottom of the driving shaft (502); the driving gear (504) is fixedly connected to the outer wall of the rotating shaft (503); the ring gear (505) is fixedly connected to the outer wall of the rotating sleeve (3); and the driving gear (504) and the ring gear (505) are meshed with each other.

2. The laser-assisted friction stir additive welding tool according to claim 1, characterized in that: Bearings (506) are fixedly mounted inside the mounting plate (1) and the lower bracket (2), and the rotating sleeve (3) is fixedly mounted in the inner ring of the bearing (506).

3. The laser-assisted friction stir additive welding tool according to claim 1, characterized in that: The mounting cover (7) comprises a first protective cover (701), a second protective cover (702) and a mounting shaft (703); the first protective cover (701) is fixedly connected to the inside of the lower bracket (2); the second protective cover (702) is bolted to the front end of the first protective cover (701); the mounting shaft (703) is movably mounted inside the first protective cover (701); and the saw blade (8) is fixedly mounted on the mounting shaft (703).

4. The laser-assisted friction stir additive welding tool according to claim 3, characterized in that: The rear end of the first protective cover (701) is fixedly connected to a laser channel (704), the laser head (6) is located on the top of the first protective cover (701), and the output end of the laser head (6) is aligned with the inside of the laser channel (704).

5. The laser-assisted friction stir additive welding tool according to claim 1, characterized in that: The second driving assembly (9) comprises a worm (901) and a worm wheel (902); the worm (901) is fixedly connected to the bottom of the rotating shaft (503); the worm wheel (902) is fixedly connected to one end of the mounting shaft (703); and the worm (901) and the worm wheel (902) are meshed with each other.

6. The laser-assisted friction stir additive welding tool according to claim 1, characterized in that: The third driving assembly (13) comprises a first bevel gear (1301), a second bevel gear (1302), a first pulley (1303), a second pulley (1304), a driving belt (1305), a toothed disc (1306) and a connecting shaft (1307), wherein the first bevel gear (1301) is fixedly connected to the outer wall of the rotating shaft (503) and is located on the top of the driving gear (504), the second bevel gear (1302) is movably mounted inside the lower bracket (2) and meshes with the first bevel gear (1301), and the first pulley (1303) is fixedly connected to the second bevel gear (1304). 02), the second pulley (1304) is movably mounted inside the upper bracket (11), the driving belt (1305) is fixedly mounted between the first pulley (1303) and the second pulley (1304), the diameter of the first pulley (1303) is smaller than the diameter of the second pulley (1304), a plurality of toothed discs (1306) are fixedly mounted in sequence at the front ends of the concave wheel (12), the two toothed discs (1306) on the same side are meshed with each other, and the connecting shaft (1307) is fixedly connected between the second pulley (1304) and one of the toothed discs (1306).

7. The laser-assisted friction stir additive welding tool according to claim 1, characterized in that: The top of the mounting plate (1) is fixedly connected to a connecting frame (14), and the top of the connecting frame (14) is fixedly mounted on a machine tool.

8. The laser-assisted friction stir additive welding tool according to claim 6, characterized in that: A slot (101) is provided inside the mounting plate (1), and the driving belt (1305) is located inside the slot (101).

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