An improved friction stir welding machine

Abstract

The utility model relates to the technical field of friction welding, and in particular to an improved stir friction welding machine, comprising a base assembly, a third frame, a second frame, a first frame and a welding assembly, wherein the third frame is movably connected to the base assembly, the second frame is movably connected to the third frame, the first frame is movably connected to the second frame, and the welding assembly is installed on the first frame; the welding assembly is provided with a steering device, a tilting device, a welding motor and a welding base, the steering device is connected to the first frame, the tilting device is connected to the steering device, the welding base is connected to the tilting device, the welding motor is fixedly connected to the first frame, and is transmission-connected to the welding base, and the welding base is used to install and fix the friction welding head. In summary, the welding machine can be endowed with the functions of tilting and steering, and the performance of its tilting and steering is optimized through the improvement of the specific structure, the welding efficiency of friction welding is enhanced, and the welding performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of friction welding, in particular to an improved friction stir welding machine. Background Art

[0002] Friction welding refers to a method of welding that uses the heat generated by the friction of the workpiece contact surface as a heat source to cause the workpiece to undergo plastic deformation under pressure. The relative movement between the welding contact end faces generates friction heat and plastic deformation heat on the friction surface and its vicinity, causing the temperature of the vicinity to rise to a temperature range close to but generally below the melting point. The deformation resistance of the material is reduced, the plasticity is improved, and the oxide film on the interface is broken. Under the action of the forging pressure, the material undergoes plastic deformation and flow, and welding is achieved through molecular diffusion and recrystallization at the interface. This is a solid-state welding method.

[0003] However, the conventional friction welding equipment has poor operational flexibility and inconvenient operation control, which is not conducive to quickly welding different positions or different welds of the welding workpiece, resulting in inconvenient welding and low welding efficiency. Utility Model Content

[0004] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0005] The utility model provides an improved friction stir welding machine, comprising a base assembly, a third frame, a second frame, a first frame and a welding assembly, wherein the third frame is movably connected to the base assembly, the second frame is movably connected to the third frame, the first frame is movably connected to the second frame, and the welding assembly is installed on the first frame; the welding assembly is provided with a steering device, a tilting device, a welding motor and a welding machine base, the steering device is connected to the first frame, the tilting device is connected to the steering device, the welding machine base is connected to the tilting device, the welding motor is fixedly connected to the first frame, and is transmission-connected to the welding machine base, and the welding machine base is used for installing and fixing a friction welding head.

[0006] As a further solution of the utility model: a coupling is also provided between the welding motor and the welding base, one end of the coupling is fixedly connected to the driving shaft of the welding motor, and the other end thereof is fixedly connected to the welding base, so that the rotational kinetic energy of the welding motor is transmitted to the welding base through the coupling, so that the welding base drives the friction welding head to rotate synchronously to perform friction welding.

[0007] As a further solution of the utility model: the steering device is provided with a steering power unit and a steering gear, the steering power unit is fixedly connected to the first frame, the steering gear is rotatably connected to the first frame, the tilting device is fixedly connected to the steering gear, and the driving shaft of the steering power unit is meshed with the steering gear, so that the steering power unit is operated, driving the steering gear to rotate a certain angle, so that the tilting device rotates synchronously, and then the friction welding head fixed on the welding machine base changes its travel direction.

[0008] As a further solution of the utility model: the steering power unit is provided with a first steering motor and a second steering motor, the first steering motor and the second steering motor are respectively fixed to two sides of the first frame, and are respectively meshed with the steering gear.

[0009] As a further solution of the utility model: the tilting device is provided with an adapter ring, an adapter bracket and a tilting cylinder, the adapter ring is fixedly connected to the steering gear, the adapter bracket is fixedly connected to the adapter ring, and are arranged in pairs on the same radial direction of the adapter ring, the tilting cylinder is lockably rotatably connected to the adapter bracket, the tilting cylinder is sleeved on the welding machine base, and forms a rotational connection therewith.

[0010] As a further solution of the utility model: a limit block is provided on the side wall of the tilting cylinder, and the limit block is synchronously tilted and rotated by a certain angle with the tilting cylinder. The adapter bracket is respectively provided with stop blocks on both sides corresponding to the limit block, and the stop blocks are used to block the limit block, thereby limiting the tilting angle of the tilting cylinder.

[0011] As a further solution of the utility model: a first motor, a first screw rod and a first guide rail are provided between the first frame and the second frame, the first screw rod and the first motor are respectively fixedly connected to the first frame, the screw rod of the first screw rod forms a transmission connection with the driving shaft of the first motor, and the nut of the first screw rod is fixedly connected to the second frame; the slide rail of the first guide rail is fixedly connected to the first frame, and the slider of the first guide rail is fixedly connected to the second frame.

[0012] As a further solution of the utility model: a second motor, a second screw rod and a second guide rail are provided between the second frame and the third frame, the second screw rod and the second motor are respectively fixedly connected to the third frame, the screw rod of the second screw rod and the driving shaft of the second motor form a transmission connection, and the nut of the second screw rod is fixedly connected to the second frame; the slide rail of the second guide rail is fixedly connected to the third frame, and the slider of the second guide rail is fixedly connected to the second frame.

[0013] As a further solution of the utility model: a third motor, a third screw rod and a third guide rail are provided between the third frame and the base assembly, the third screw rod and the third motor are respectively fixedly connected to the base assembly, the screw rod of the third screw rod and the driving shaft of the third motor form a transmission connection, and the nut of the third screw rod is fixedly connected to the third frame; the slide rail of the third guide rail is fixedly connected to the base assembly, and the slider of the third guide rail is fixedly connected to the third frame.

[0014] As a further solution of the utility model: the base assembly is provided with a mobile platform and a welding platform, the mobile platform is used to install the third frame, and the welding platform is used to place the welding workpiece; the side of the mobile platform facing the welding platform is provided with a lateral guide rail, the slide rail of the lateral guide rail is fixedly connected to the side wall of the mobile platform, and the slider of the lateral guide rail is fixedly connected to the third frame.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. By setting a steering device, the welding machine base and the friction welding head can be steered on the welding workpiece, that is, the steering operation can be performed during the friction welding process, so as to weld some special workpieces or special welds, improve the applicability of friction welding, and also avoid stopping to adjust the friction welding head or adjust the workpiece, thereby improving the overall welding efficiency.

[0017] 2. Two steering power units are arranged on both sides of the first frame, and the two steering power units drive the steering gear synchronously, so that the steering gear rotates more smoothly, preventing the vibration of the friction welding head during the steering process and avoiding welding accidents.

[0018] 3. By setting a tilting device, the friction welding head can be tilted at a certain angle during the welding process, so as to better advance the friction welding on the workpiece, and also to weld the weld more deeply, thereby enhancing the quality and depth of welding and improving the welding performance.

[0019] Therefore, through the above-mentioned improvements, the utility model can provide an improved stir friction welding machine, which has the functions of tilting and turning. Through the improvement of the specific structure, its tilting and turning performance is optimized, the welding efficiency of friction welding is enhanced, and the welding performance is improved.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the base assembly of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the third frame of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the second frame of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the first frame of the utility model;

[0027] Figure 6 It is a structural schematic diagram of a welding motor and a coupling of the utility model;

[0028] Figure 7 It is a structural schematic diagram of the steering device of the utility model;

[0029] Figure 8 It is a structural schematic diagram of the tilting device of the utility model;

[0030] Fig. 9 It is a cross-sectional schematic diagram of the tilting device of the utility model.

[0031] The reference numerals and names in the figures are as follows:

[0032] 10 base assembly; 11 moving platform; 12 welding platform; 13 lateral guide rail; 20 third frame; 21 third motor; 22 third screw rod; 23 third guide rail; 30 second frame; 31 second motor; 32 second screw rod; 33 second guide rail; 40 first frame; 41 first motor; 42 first screw rod; 43 first guide rail; 50 welding assembly; 51 steering device; 52 steering power unit; 53 steering gear; 54 first steering motor; 55 second steering motor; 60 tilting device; 61 adapter ring; 62 adapter bracket; 63 stop block; 64 tilting cylinder; 65 limit block; 70 welding motor; 71 welding base; 72 coupling. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0034] See also Figures 1 to 9 In an embodiment of the utility model, an improved friction stir welding machine includes a base assembly 10, a third frame 20, a second frame 30, a first frame 40 and a welding assembly 50, wherein the third frame 20 is movably connected to the base assembly 10, the second frame 30 is movably connected to the third frame 20, the first frame 40 is movably connected to the second frame 30, and the welding assembly 50 is installed on the first frame 40; the welding assembly 50 is provided with a steering device 51, a tilting device 60, a welding motor 70 and a welding machine base 71, the steering device 51 is transmission-connected to the first frame 40, the tilting device 60 is transmission-connected to the steering device 51, the welding machine base 71 is transmission-connected to the tilting device 60, the welding motor 70 is fixed to the first frame 40, and is transmission-connected to the welding machine base 71, and the welding machine base 71 is used to install and fix the friction welding head.

[0035] Specifically, in order to perform friction welding on the welding workpiece, it is preferred that a mobile platform 11 and a welding platform 12 are provided on the base assembly 10, wherein the mobile platform 11 and the welding platform 12 can be independent solid platforms, or can be solid platforms formed in one piece or assembled in one piece. The mobile platform 11 is used to install the third frame 20, and the welding platform 12 is used to place the welding workpiece; the welding platform 12 can also be provided with a welding fixture in existing products, so that it can stably clamp and fix the welding workpiece on the welding platform 12, and keep the welding workpiece motionless on the welding platform 12. By the third frame 20, the second frame 30 and the first frame 40 provided on the mobile platform 11, the welding assembly 50 is moved so that the weld on the welding workpiece is friction welded according to the preset welding line.

[0036] Secondly, since the welding platform 12 is on one side of the mobile platform 11, the welding assembly 50 needs to move toward the welding platform 12 in order to perform corresponding welding on the welding workpiece, so that the center of gravity of the entire frame also moves toward the welding platform 12, in order to balance the center of gravity of the frame and provide stable support for the frame. Preferably, a lateral guide rail 13 is provided on the side of the mobile platform 11 facing the welding platform 12, the slide rail of the lateral guide rail 13 is fixed to the side wall of the mobile platform 11, and the slider of the lateral guide rail 13 is fixed to the third frame 20. Thereby, the weight of the third frame 20 and the entire frame can be partially shared and supported by the lateral guide rail 13, so that the movement of the entire frame is more stable and reliable.

[0037] like Figure 6 As shown, preferably, a coupling 72 is further provided between the welding motor 70 and the welding base 71, one end of the coupling 72 is fixedly connected to the driving shaft of the welding motor 70, and the other end thereof is fixedly connected to the welding base 71, so that the rotational kinetic energy of the welding motor 70 is transmitted to the welding base 71 through the coupling 72, so that the welding base 71 drives the friction welding head to rotate synchronously to perform friction welding.

[0038] Specifically, the coupling 72 can adopt the ball cage universal coupling 72 in existing products, so that the welding machine base 71 can be tilted at a certain angle, so that the friction welding head can be rotated at a high speed under the drive of the welding motor 70 when tilted at a certain angle, thereby friction welding the workpiece.

[0039] like Figures 5 to 7 As shown, preferably, the steering device 51 is provided with a steering power unit 52 and a steering gear 53, the steering power unit 52 is fixedly connected to the first frame 40, the steering gear 53 is rotatably connected to the first frame 40, the tilting device 60 is fixedly connected to the steering gear 53, and the driving shaft of the steering power unit 52 is meshed with the steering gear 53, so that the steering power unit 52 is operated, driving the steering gear 53 to rotate a certain angle, so that the tilting device 60 rotates synchronously, and then the friction welding head fixed on the welding machine base 71 changes its travel direction.

[0040] Specifically, when welding a workpiece, it may be necessary to turn, that is, the welds are in different directions, so it is necessary to change the forward direction of the friction welding head so that it can weld welds in different directions. The steering device 51 drives the steering gear 53 through the steering power unit 52 to complete the steering operation. Among them, the steering gear 53 is rotatably connected to the first frame 40, such as through a bearing to form a rotatable connection. It is preferred to use an axial contact bearing or an angular contact bearing that can withstand an axial load, so that the tilting device 60 and the welding base 71 can be fixed on the steering gear 53 and form a rotatable connection through the bearing.

[0041] like Figure 7 As shown, preferably, the steering device 51 is provided with a first steering motor 54 and a second steering motor 55 , and the first steering motor 54 and the second steering motor 55 are respectively fixed to two sides of the first frame 40 and are respectively meshed with the steering gear 53 .

[0042] Specifically, since the steering operation of the friction welding head is performed in real time during its normal operation, it is necessary to ensure that the welding process of the friction welding head will not deviate or vibrate. Since the steering gear 53 is relatively large, it is rotatably connected to the first frame 40 through a bearing. When it is driven by only one steering motor, it is easy to deviate or vibrate. Therefore, two steering motors can be respectively arranged on both sides of the first frame 40, so that they can drive the steering gear 53 at the same time, thereby enhancing the stability of the steering gear 53. The steering motor is preferably a synchronous motor, so as to facilitate accurate driving and control of its rotation angle and rotation speed.

[0043] like Figures 7 to 9 As shown, preferably, the tilting device 60 is provided with an adapter ring 61, an adapter bracket 62 and a tilting cylinder 64, the adapter ring 61 is fixedly connected to the steering gear 53, the adapter bracket 62 is fixedly connected to the adapter ring 61, and are arranged in pairs on the same radial direction of the adapter ring 61, the tilting cylinder 64 is lockably rotatably connected to the adapter bracket 62, and the tilting cylinder 64 is sleeved on the welding machine base 71 and forms a rotational connection therewith.

[0044] Specifically, for different welding workpieces or welding requirements, the friction welding head requires different welding depths or different welding angles, so the inclination angle of the friction welding head needs to be adjusted. The friction welding head is loaded in the tilting cylinder 64, so the tilting cylinder 64 can be tilted to adjust the inclination angle of the friction welding head. The tilting cylinder 64 and the adapter bracket 62 can be rotatably connected, for example, using a lockable rotating shaft connection, so that the welder can adjust the inclination angle of the tilting cylinder 64 before starting welding, and then lock it again.

[0045] like Figure 8 and Fig. 9 As shown, preferably, a limit block 65 is provided on the side wall of the tilting cylinder 64, and the limit block 65 is synchronously tilted and rotated by a certain angle with the tilting cylinder 64, and the adapter bracket 62 is respectively provided with a stop block 63 on both sides corresponding to the limit block 65, and the stop block 63 is used to block the limit block 65, thereby limiting the tilting angle of the tilting cylinder 64.

[0046] Specifically, although the tilting angle of the tilting cylinder 64 can be adjusted before friction welding, thereby adjusting the tilting angle of the friction welding head, the tilting angle should not be too large for the normal welding process and to avoid damaging the friction welding head. Therefore, a stopper 63 and a limiter 65 can be provided to cooperate with each other to block the tilting cylinder 64 and avoid the tilting angle being too large. Preferably, the limiter 65 can be provided at both ends of the connection between the tilting cylinder 64 and the adapter bracket 62, and two limiters 65 are provided, and the adapter bracket 62 provided in pairs can also be provided with two sets of stoppers 63, so that they respectively form corresponding stopper and limit operations with the two limiters 65.

[0047] like Figure 4 and Figure 5 As shown, preferably, a first motor 41, a first screw rod 42 and a first guide rail 43 are provided between the first frame 40 and the second frame 30, the first screw rod 42 and the first motor 41 are respectively fixedly connected to the first frame 40, the screw rod of the first screw rod 42 forms a transmission connection with the driving shaft of the first motor 41, and the nut of the first screw rod 42 is fixedly connected to the second frame 30; the slide rail of the first guide rail 43 is fixedly connected to the first frame 40, and the slider of the first guide rail 43 is fixedly connected to the second frame 30.

[0048] Specifically, in order to enable the welding assembly 50 to move up and down in the vertical direction of the Z axis, a corresponding first motor 41, a first screw rod 42 and a first guide rail 43 can be provided, so that the first motor 41 is operated to drive the screw of the first screw rod 42 to rotate, thereby causing the nut of the first screw rod 42 to move along the screw rod, and at the same time driving the second frame 30 fixed to the nut to move synchronously. The provision of the first guide rail 43 can make the relative movement between the second frame 30 and the first frame 40 smoother and more stable.

[0049] like Figure 3 and Figure 4 As shown, preferably, a second motor 31, a second screw rod 32 and a second guide rail 33 are provided between the second frame 30 and the third frame 20, the second screw rod 32 and the second motor 31 are respectively fixedly connected to the third frame 20, the screw rod of the second screw rod 32 forms a transmission connection with the driving shaft of the second motor 31, and the nut of the second screw rod 32 is fixedly connected to the second frame 30; the slide rail of the second guide rail 33 is fixedly connected to the third frame 20, and the slider of the second guide rail 33 is fixedly connected to the second frame 30.

[0050] Similarly, in order to enable the welding assembly 50 to move forward and backward in the longitudinal direction of the Y axis, a corresponding second motor 31, a second screw rod 32 and a second guide rail 33 can be provided, so that the second motor 31 is operated to drive the screw rod of the second screw rod 32 to rotate, thereby causing the nut of the second screw rod 32 to move along the screw rod, and at the same time driving the second frame 30 fixed to the nut to move synchronously. The provision of the second guide rail 33 can make the relative movement between the second frame 30 and the third frame 20 smoother and more stable.

[0051] like Figure 2 and Figure 3 As shown, preferably, a third motor 21, a third screw rod 22 and a third guide rail 23 are provided between the third frame 20 and the base assembly 10, the third screw rod 22 and the third motor 21 are respectively fixedly connected to the base assembly 10, the screw rod of the third screw rod 22 forms a transmission connection with the driving shaft of the third motor 21, and the nut of the third screw rod 22 is fixedly connected to the third frame 20; the slide rail of the third guide rail 23 is fixedly connected to the base assembly 10, and the slider of the third guide rail 23 is fixedly connected to the third frame 20.

[0052] Similarly, in order to enable the welding assembly 50 to move left and right in the horizontal direction of the X-axis, a corresponding third motor 21, a third screw rod 22 and a third guide rail 23 can be provided, so that the third motor 21 is operated to drive the screw of the third screw rod 22 to rotate, thereby causing the nut of the third screw rod 22 to move along the screw rod, and at the same time driving the third frame 20 fixed to the nut to move synchronously. The provision of the third guide rail 23 can make the relative movement between the third frame 20 and the base assembly 10 smoother and more stable.

[0053] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. An improved friction stir welding machine, characterized in that: The invention comprises a base assembly (10), a third frame (20), a second frame (30), a first frame (40) and a welding assembly (50), wherein the third frame (20) is movably connected to the base assembly (10), the second frame (30) is movably connected to the third frame (20), the first frame (40) is movably connected to the second frame (30), and the welding assembly (50) is mounted on the first frame (40); the welding assembly (50) is provided with a steering device (51), a tilting device (60), a welding motor (70) and a welding machine base (71), the steering device (51) is connected to the first frame (40), the tilting device (60) is connected to the steering device (51), the welding machine base (71) is connected to the tilting device (60), the welding motor (70) is fixedly connected to the first frame (40) and is transmission-connected to the welding machine base (71), and the welding machine base (71) is used to mount and fix a friction welding head.

2. An improved friction stir welding machine according to claim 1, characterized in that: A coupling (72) is further provided between the welding motor (70) and the welding machine base (71); one end of the coupling (72) is fixedly connected to the driving shaft of the welding motor (70), and the other end of the coupling (72) is fixedly connected to the welding machine base (71), so that the rotational kinetic energy of the welding motor (70) is transmitted to the welding machine base (71) through the coupling (72), so that the welding machine base (71) drives the friction welding head to rotate synchronously, thereby performing friction welding.

3. An improved friction stir welding machine according to claim 1, characterized in that: The steering device (51) is provided with a steering power unit (52) and a steering gear (53); the steering power unit (52) is fixedly connected to the first frame (40); the steering gear (53) is rotatably connected to the first frame (40); the tilting device (60) is fixedly connected to the steering gear (53); a driving shaft of the steering power unit (52) is meshedly connected to the steering gear (53), so that the steering power unit (52) is operated, driving the steering gear (53) to rotate a certain angle, so that the tilting device (60) is synchronously rotated, and thus the friction welding head fixed on the welding machine base (71) changes its travel direction.

4. An improved friction stir welding machine according to claim 3, characterized in that: The steering power unit (52) is provided with a first steering motor (54) and a second steering motor (55); the first steering motor (54) and the second steering motor (55) are respectively fixed to two sides of the first frame (40) and are respectively meshed with the steering gear (53).

5. An improved friction stir welding machine according to claim 3, characterized in that: The tilting device (60) is provided with an adapter ring (61), an adapter bracket (62) and a tilting cylinder (64); the adapter ring (61) is fixedly connected to the steering gear (53); the adapter bracket (62) is fixedly connected to the adapter ring (61) and is arranged in pairs on the same radial direction of the adapter ring (61); the tilting cylinder (64) is lockably rotatably connected to the adapter bracket (62); the tilting cylinder (64) is sleeved on the welding machine base (71) and is rotatably connected thereto.

6. An improved friction stir welding machine according to claim 5, characterized in that: A limit block (65) is provided on the side wall of the tilting cylinder (64), and the limit block (65) is synchronously tilted and rotated at a certain angle with the tilting cylinder (64). The adapter bracket (62) is provided with stop blocks (63) on both sides corresponding to the limit block (65), and the stop blocks (63) are used to block the limit block (65), thereby limiting the tilting angle of the tilting cylinder (64).

7. An improved friction stir welding machine according to claim 1, characterized in that: A first motor (41), a first screw rod (42) and a first guide rail (43) are provided between the first frame (40) and the second frame (30); the first screw rod (42) and the first motor (41) are respectively fixedly connected to the first frame (40); the screw rod of the first screw rod (42) is in transmission connection with the drive shaft of the first motor (41); the nut of the first screw rod (42) is fixedly connected to the second frame (30); the slide rail of the first guide rail (43) is fixedly connected to the first frame (40); and the slider of the first guide rail (43) is fixedly connected to the second frame (30).

8. An improved friction stir welding machine according to claim 1, characterized in that: A second motor (31), a second screw rod (32) and a second guide rail (33) are provided between the second frame (30) and the third frame (20); the second screw rod (32) and the second motor (31) are respectively fixedly connected to the third frame (20); the screw rod of the second screw rod (32) is in transmission connection with the drive shaft of the second motor (31); the nut of the second screw rod (32) is fixedly connected to the second frame (30); the slide rail of the second guide rail (33) is fixedly connected to the third frame (20); and the slider of the second guide rail (33) is fixedly connected to the second frame (30).

9. An improved friction stir welding machine according to claim 1, characterized in that: A third motor (21), a third screw rod (22) and a third guide rail (23) are provided between the third frame (20) and the base assembly (10); the third screw rod (22) and the third motor (21) are respectively fixedly connected to the base assembly (10); the screw rod of the third screw rod (22) is in transmission connection with the drive shaft of the third motor (21); the nut of the third screw rod (22) is fixedly connected to the third frame (20); the slide rail of the third guide rail (23) is fixedly connected to the base assembly (10); and the slider of the third guide rail (23) is fixedly connected to the third frame (20).

10. An improved friction stir welding machine according to claim 1, characterized in that: The base assembly (10) is provided with a moving platform (11) and a welding platform (12); the moving platform (11) is used to install a third frame (20), and the welding platform (12) is used to place a welding workpiece; a lateral guide rail (13) is provided on the side of the moving platform (11) facing the welding platform (12); a slide rail of the lateral guide rail (13) is fixedly connected to a side wall of the moving platform (11), and a slider of the lateral guide rail (13) is fixedly connected to the third frame (20).

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