A high-precision friction stir welding machine

Abstract

The invention discloses a high-precision friction stir welding machine, which relates to the technical field of friction stir welding. The machine comprises a C-shaped frame formed by connecting an upper right-angle plate and a lower right-angle plate, a friction stir welding head connected to the upper right-angle plate in a suspended and movable manner, and a positioning mechanism installed in an opening area of ​​the C-shaped frame. When two guide wires move along the weld, their angles change all the time as the curvature of the arc joint changes. Therefore, the friction stir welding head will also change the tangent point position (lateral position) all the time under the compulsion of a deviation correction pendulum, so that the friction stir welding head can move strictly according to the tangent point position of the arc joint. The machine has high welding precision and is suitable for irregular weld joints of high-precision workpieces. The machine has a high degree of automation and can move strictly according to the tangent point position of the arc joint and can change adaptively following the change of the curvature. The machine can also adapt to the welding of welds in which arc joints and straight joints alternate.

Description

Technical Field

[0001] The invention relates to the technical field of friction stir welding, in particular to a high-precision friction stir welding machine. Background Art

[0002] Friction stir welding is a solid-state welding process in which the stirring head of the welding tool mechanically stirs the joint area under the action of the tool's rotation and feeding. This stirring causes the metal materials to be reorganized in a solid state, thereby achieving joining. It is mainly used to connect aluminum alloys and other metal materials, especially in the fields of aerospace, automobile and shipbuilding.

[0003] Compared with traditional welding methods, friction stir welding has the advantages of uniform heat distribution, reducing thermal stress and deformation of materials, and achieving joint strength close to the level of parent material. At the same time, since the weldments are connected in the solid state, defects in the melting process (such as pores, cracks, etc.) are avoided.

[0004] Friction stir welding, which is relatively simple to operate, low in cost, low in deformation, and high in joint strength, has become the preferred welding method for many welding workpieces. However, the above welding advantages are mainly for workpieces with relatively straight welds. When welding irregular welds such as arcs, the advantages of friction stir welding cannot be brought into play, and even welding cannot be achieved. Generally speaking, irregular welds are usually welded by manual arc welding or gas shielded welding. These two welding methods can well adapt to welds of various shapes and sizes, and are flexible in operation and can meet different process requirements. However, manual arc welding has problems such as poor precision, high labor intensity, and low efficiency, while gas shielded welding is greatly affected by the environment, welding position, and cost. The most important reason is that gas shielded welding usually uses a higher heat input, which may cause larger welding deformation, especially in thin plate welding;

[0005] Therefore, how to use the friction stir welding method with relatively simple operation, low cost, low deformation and high joint strength to achieve welding of workpieces with irregular welds is a problem that needs to be solved in the current welding field.

[0006] In view of the above problems, it is urgent to carry out innovative design based on the original friction stir welding machine. Summary of the invention

[0007] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a high-precision friction stir welding machine to solve the problem that the friction stir welding with relatively simple operation, low cost, low deformation and high joint strength proposed in the above background technology has become the preferred welding method for many welding workpieces, but the above welding advantages are mainly for workpieces with relatively straight welds. When welding irregular welds such as arcs, the advantages of friction stir welding cannot be brought into play, and even welding cannot be achieved.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-precision friction stir welding machine, comprising a C-shaped frame composed of an upper right-angle plate and a lower right-angle plate, a friction stir welding head suspended and movably connected to the upper right-angle plate, and a positioning mechanism installed in the opening area of ​​the C-shaped frame, the non-working end of the friction stir welding head is equipped with a correction pendulum which is telescopically movably connected to the lower right-angle plate and can adaptively deflect and flexibly adjust the welding position of the friction stir welding head according to the weld, and the lower end of the correction pendulum is hinged with a telescopic column movably connected to the lower right-angle plate.

[0009] Preferably, the two right-angled sides of the upper right-angle plate are respectively and vertically fitted with an upper longitudinal plate and an upper transverse plate, and the end of the upper longitudinal plate is threaded with a one-way screw rod installed on the upper surface of the upper right-angle plate, and a servo motor is installed at the end of the one-way screw rod.

[0010] Preferably, the end of the upper transverse plate slides through an upper guide column installed on the upper surface of the upper right-angle plate, and the upper longitudinal plate and the upper transverse plate are vertically distributed in a spatially staggered manner so as to fit each other.

[0011] Preferably, the upper longitudinal plate and the upper transverse plate are both provided with sliding grooves, and a robotic arm is clamped in the spatial overlapping area of ​​the sliding grooves inside the upper longitudinal plate and the upper transverse plate, and the outer wall of the robotic arm is symmetrically fixed with retaining rings that fit the upper surface of the upper longitudinal plate and the lower surface of the upper transverse plate, and the telescopic adjustment end of the robotic arm is connected to a high-speed motor, and the stir friction welding head is connected to the output end of the high-speed motor.

[0012] Preferably, the outer wall bearing of the friction stir welding head is installed with an annular positioning piece, and the end of the deviation-correcting pendulum is horizontally penetrated with an insertion rod, and the end of the insertion rod is fixedly connected to the side wall of the annular positioning piece, and the annular positioning piece is slidably arranged in a slide rail provided through the upper end of the deviation-correcting pendulum;

[0013] A first spring is wound around the outer wall of the insertion rod, one end of the first spring is welded to the end of the insertion rod, and the other end of the first spring is fixed to the outer wall of the deviation-correcting pendulum.

[0014] Preferably, the correcting pendulum is U-shaped, and two inner and outer guide wires are vertically and tautly arranged between the U-shaped ports of the correcting pendulum, both of which are located in the weld and used to position the stir friction welding head, and the guide wires are made of high-strength material that is resistant to high temperatures, and the central axis of the telescopic column coincides with the central axis of the inner guide wire.

[0015] Preferably, the two right-angled sides of the lower right-angled plate are respectively and vertically fitted with a lower longitudinal plate and a lower transverse plate, and the ends of the lower longitudinal plate and the lower transverse plate are slidably penetrated by lower guide columns installed on the upper surfaces of the two right-angled sides of the lower right-angled plate.

[0016] Preferably, the lower longitudinal plate and the lower transverse plate are space-staggered and vertically distributed in mutual contact, and the lower longitudinal plate and the lower transverse plate are both provided with sliding grooves, and the lower ends of the telescopic columns are clamped and arranged in the spatial overlapping area of ​​the sliding grooves inside the lower longitudinal plate and the lower transverse plate;

[0017] The outer wall of the telescopic column is symmetrically fixed with a retaining ring that fits the upper surface of the lower longitudinal plate and the lower surface of the lower transverse plate.

[0018] Preferably, the positioning mechanism includes a fixedly installed T-shaped plate, a bidirectional screw installed on the side of the T-shaped plate, and a side clamping plate symmetrically threadedly installed on the outer wall of the bidirectional screw for clamping the workpiece, the side wall of the T-shaped plate is provided with a groove for limiting the side clamping plate, and an adjusting rod is threadedly installed at the center of the T-shaped plate, and the ends of the adjusting rod are symmetrically hinged to form an L-shaped supporting plate for respectively supporting two welding workpieces.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] When the weld between the workpieces is straight, the two guide wires are synchronously located in the straight weld. Since the guide wires are taut, they can be understood as two thin cylinders, and the surface formed by the two guide wires is parallel to the correction pendulum. Therefore, the two guide wires horizontally inserted into the straight weld will also make the correction pendulum be aligned with the straight weld. Subsequently, the servo motor is started, and the servo motor drives the one-way screw to rotate. Under the action of the thread and the fitting limit of the upper surface of the C-shaped frame, the upper longitudinal plate will move horizontally along the outer wall of the one-way screw, and the moving direction is parallel to or coincides with the straight line where the weld is located. At this time, the upper longitudinal plate The plate pushes the mechanical arm to be transported horizontally along the slide groove inside the upper horizontal plate, while driving the high-speed motor and the friction stir welding head to be transported horizontally along the straight weld. During this period, the correcting pendulum and the friction stir welding head guided by the correcting pendulum will maintain a horizontal movement state that fits the straight weld without angular deflection. On the one hand, when the blanking depth of the friction stir welding head is adjusted, the telescopic column can adapt to the height change of the correcting pendulum; on the other hand, the telescopic column can follow the correcting pendulum to move arbitrarily in the rectangular area surrounded by the lower longitudinal plate and the lower horizontal plate, so as to realize the welding of the straight weld.

[0021] When it is necessary to weld an irregular arc weld, the two guide wires are also located at the initial position of welding. At this time, since the weld where the two guide wires are located is an arc weld, the plane where the two guide wires are located is the tangent position of the arc weld in this area. Therefore, the correction pendulum extended by the two guide wires and located in the same plane will also deflect to an angle tangent to the arc weld. When the angle of the correction pendulum changes, the correction pendulum will deflect with the common central axis of the inner guide wire and the lower telescopic column as the axis, and when the correction pendulum deflects, the through groove inside it will adaptively push the annular positioning member in the direction of the deflection, and the annular positioning member is restricted by the position of the robot arm and cannot move laterally. Therefore, after being pushed, the annular positioning member will push the high-speed motor and the robot arm through the stir friction welding head, so that the robot arm drives the upper cross plate to slide adaptively along the outer wall of the upper guide column and drives the insertion rod to adaptively extend and retract to meet the rotation needs of the correction pendulum;

[0022] Subsequently, the servo motor and the high-speed motor are started. Similarly, the one-way screw generates a horizontal thrust along the direction of the weld to the robot arm and the friction stir welding head below through the upper longitudinal plate. However, the deflection angle (longitudinal displacement) of the friction stir welding head is regulated by the deflection correction pendulum, and the angle of the deflection correction pendulum is regulated by two guide wires. At the same time, the two guide wires are always at an angle tangent to the arc weld. Therefore, the external U-shaped deflection correction pendulum will always ensure an angle tangent to the arc of the weld. In other words, the friction stir welding head will always be at the tangent point of the deflection correction pendulum and the arc joint, and the two guide wires will always be at the tangent point of the deflection correction pendulum and the arc joint. When the root guide wire moves along the weld, its angle will change constantly with the change of the curvature of the arc joint. Therefore, the friction stir welding head will also change the tangent point position (lateral position) constantly under the compulsion of the correction pendulum, so that the friction stir welding head can move strictly according to the tangent point position of the arc joint. The welding accuracy is high, which is suitable for irregular weld connections of high-precision workpieces. It has a high degree of automation and can move strictly according to the tangent point position of the arc joint and can adaptively change with the change of curvature. It can also adapt to the welding of alternating arc joints and straight joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the first stereogram of the present invention.

[0024] Figure 2 This is the second stereogram of the present invention.

[0025] Figure 3 This is the third stereogram of the present invention.

[0026] Figure 4 This is the fourth stereogram of the present invention.

[0027] Figure 5 It is the first stereoscopic view of the positioning mechanism of the present invention after being cut away.

[0028] Figure 6 This is a second stereoscopic view of the positioning mechanism of the present invention after being cut away.

[0029] Figure 7 It is a first stereoscopic view of the positioning mechanism of the present invention.

[0030] Figure 8 It is a second stereoscopic view of the positioning mechanism of the present invention.

[0031] Fig. 9 It is a three-dimensional diagram of the deviation-correcting ornament of the present invention.

[0032] Fig.10 For the present invention Fig. 9 Enlarged structural diagram at A in the middle.

[0033] In the figure: 1. C-shaped frame; 11. Lower guide column; 2. Upper vertical plate; 21. One-way screw; 22. Servo motor; 3. Upper horizontal plate; 31. Upper guide column; 4. Lower vertical plate; 5. Lower horizontal plate; 6. Robot arm; 61. High-speed motor; 62. Friction stir welding head; 7. Correction pendulum; 71. Guide wire; 72. Ring positioning piece; 73. Insert rod; 74. First spring; 8. Telescopic column; 9. T-shaped plate; 91. Two-way screw; 92. Side clamp; 93. L-shaped support plate; 94. Adjustment rod. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figures 1 to 10 The present invention provides a technical solution: a high-precision friction stir welding machine, comprising a C-shaped frame 1 composed of an upper right-angle plate and a lower right-angle plate, a friction stir welding head 62 suspended and movably connected to the upper right-angle plate, and a positioning mechanism installed in the opening area of ​​the C-shaped frame 1, a non-working end of the friction stir welding head 62 is equipped with a correction pendulum 7 which is telescopically movably connected to the lower right-angle plate and can adaptively deflect and flexibly adjust the welding position of the friction stir welding head 62 according to the weld, and the lower end of the correction pendulum 7 is hinged with a telescopic column 8 movably connected to the lower right-angle plate.

[0036] The two right-angled sides of the upper right-angle plate are respectively and vertically fitted with an upper longitudinal plate 2 and an upper transverse plate 3, and the end of the upper longitudinal plate 2 is threaded with a one-way screw rod 21 installed on the upper surface of the upper right-angle plate, and a servo motor 22 is installed at the end of the one-way screw rod 21.

[0037] The end of the upper transverse plate 3 slides through an upper guide column 31 installed on the upper surface of the upper right-angle plate, and the upper longitudinal plate 2 and the upper transverse plate 3 are vertically distributed in a spatially displaced manner and fit each other.

[0038] Slide grooves are provided through the interior of the upper longitudinal plate 2 and the upper transverse plate 3, and a robotic arm 6 is provided in the spatial overlapping area of ​​the slide grooves inside the upper longitudinal plate 2 and the upper transverse plate 3. The outer wall of the robotic arm 6 is symmetrically fixed with retaining rings that fit the upper surface of the upper longitudinal plate 2 and the lower surface of the upper transverse plate 3, and the telescopic adjustment end of the robotic arm 6 is connected to a high-speed motor 61, and the stir friction welding head 62 is connected to the output end of the high-speed motor 61.

[0039] The outer wall bearing of the friction stir welding head 62 is equipped with an annular positioning member 72, and the end of the correction pendulum 7 is horizontally penetrated with an insertion rod 73, and the end of the insertion rod 73 is fixedly connected to the side wall of the annular positioning member 72, and the annular positioning member 72 is slidably arranged in a slide rail provided through the upper end of the correction pendulum 7;

[0040] A first spring 74 is wound around the outer wall of the insertion rod 73 , one end of the first spring 74 is welded to the end of the insertion rod 73 , and the other end of the first spring 74 is fixed to the outer wall of the deviation-correcting pendulum 7 .

[0041] The correcting pendulum 7 is U-shaped, and two inner and outer guide wires 71 are vertically and tautly arranged between the U-shaped ends of the correcting pendulum 7, both of which are located in the weld and used to position the stir friction welding head 62. The guide wires 71 are made of high-strength material that is resistant to high temperatures, and the central axis of the telescopic column 8 coincides with the central axis of the inner guide wire 71.

[0042] The two right-angled sides of the lower right-angled plate are respectively and vertically fitted with a lower longitudinal plate 4 and a lower transverse plate 5, and the ends of the lower longitudinal plate 4 and the lower transverse plate 5 are slidably penetrated by lower guide columns 11 installed on the upper surfaces of the two right-angled sides of the lower right-angled plate.

[0043] The lower longitudinal plate 4 and the lower transverse plate 5 are arranged vertically in a space-staggered manner so as to fit each other, and the interiors of the lower longitudinal plate 4 and the lower transverse plate 5 are provided with sliding grooves, and the lower ends of the telescopic columns 8 are engaged with and arranged in the space-overlapping area of ​​the sliding grooves inside the lower longitudinal plate 4 and the lower transverse plate 5;

[0044] The outer wall of the telescopic column 8 is symmetrically fixed with retaining rings that are in contact with the upper surface of the lower longitudinal plate 4 and the lower surface of the lower transverse plate 5 .

[0045] The positioning mechanism includes a fixedly installed T-shaped plate 9, a bidirectional screw 91 installed on the side of the T-shaped plate 9, and a side clamp 92 symmetrically threadedly installed on the outer wall of the bidirectional screw 91 for clamping the workpiece. The side wall of the T-shaped plate 9 is provided with a groove for limiting the side clamp 92, and an adjusting rod 94 is threadedly installed at the center of the T-shaped plate 9, and the ends of the adjusting rod 94 are symmetrically hinged to form an L-shaped supporting plate 93 for supporting two welding workpieces respectively. Example

[0046] First, place the two workpieces to be welded together. Figure 7 and Figure 8 The two L-shaped support plates 93 shown in the figure are made to make the two ends of the workpiece rest against the L-shaped ends of the L-shaped support plates 93, and then the bidirectional screw rod 91 is rotated so that the side clamping plates 92 on both sides respectively rest against the sides of the two workpieces but do not clamp them too tightly first (the bidirectional screw rod 91 is divided into two by the middle end and is hinged to each other, and the two ends of the bidirectional screw rod 91 can be adjusted respectively to distinguish and adjust the positions of the side clamping plates 92 on both sides). Subsequently, since the L-shaped support plate 93 is restricted by the workpiece and cannot rotate with the adjusting rod 94, the L-shaped support plate 93 and the workpiece can be adjusted to the appropriate position inside the C-shaped frame 1 by rotating the adjusting rod 94. Finally, the two ends of the bidirectional screw rod 91 are respectively rotated so that the side clamping plates 92 on both sides are respectively clamped on the two sides of the workpiece, thereby realizing adjustable clamping of different workpieces, and the supporting and side clamping effects on the workpiece cooperate and conflict with each other, which helps to improve the stability of the workpiece during welding.

[0047] When welding starts, Figure 1 and Figure 2 As shown, the two guide wires 71 inside the U-shaped end of the correcting pendulum 7 are synchronously placed in the weld of the workpiece by manual adjustment (needing to cooperate with the positioning mechanism in the first paragraph of the embodiment, through the adjustment of both sides of the bidirectional screw rod 91, a gap sufficient for the guide wire 71 to move is left between the workpieces, wherein the guide wire 71 in this embodiment is made of a cobalt-based alloy in the form of a filament, which is high temperature resistant, wear-resistant and corrosion-resistant. In fact, in other implementation schemes, guide wires 71 of other high temperature resistant and wear-resistant materials can be selected based on the welding temperature and material of the welding workpiece).

[0048] 1. When the weld between the workpieces is straight, the two guide wires 71 are synchronously located in the straight weld. Since the guide wires 71 are taut, they can be understood as two thin cylinders, and the surface formed by the two guide wires 71 is parallel to the correcting pendulum 7. Therefore, the two guide wires 71 inserted horizontally into the straight weld will also make the correcting pendulum 7 aligned with the straight weld. Subsequently, the servo motor 22 is started, and the servo motor 22 drives the one-way screw 21 to rotate. Under the action of the thread and the fitting limit of the upper surface of the C-shaped frame 1, the upper longitudinal plate 2 will move horizontally along the outer wall of the one-way screw 21, and the moving direction is parallel to or coincides with the straight line where the weld is located. At this time, the upper longitudinal plate 2 drives the high-speed motor 61 and the friction stir welding head 62 along the horizontal transmission of the slide groove inside the upper cross plate 3 by pushing the mechanical arm 6. The straight weld is transmitted horizontally, and during this period, the two guide wires 71 maintain a horizontal moving state in contact with the straight weld without angular deflection. Therefore, the correcting pendulum 7 and the friction stir welding head 62 guided by the correcting pendulum 7 will also maintain a horizontal moving state in contact with the straight weld without angular deflection. At the same time, based on the welding material and welding process requirements, the welding head blanking depth of the friction stir welding head 62 can be adjusted and controlled by the extension and retraction of the robot arm 6. The lower end of the correcting pendulum 7 is connected to a telescopic column 8. On the one hand, when the blanking depth of the friction stir welding head 62 is adjusted, the telescopic column 8 can adapt to the height change of the correcting pendulum 7; on the other hand, the telescopic column 8 can follow the correcting pendulum 7 to move arbitrarily in the rectangular area surrounded by the lower longitudinal plate 4 and the lower horizontal plate 5, so as to realize the welding of the straight weld.

[0049] 2. When welding is required Figure 1 When the irregular arc weld is formed, first, the two guide wires 71 are also positioned at the initial position of the welding, as shown in FIG. Figure 2 and Figure 3 As shown in FIG. 1 , at this time, since the weld where the two guide wires 71 are located is an arc weld, the orientation of the correction pendulum 7 controlled by the two guide wires 71 will also change adaptively. The plane where the two guide wires 71 are located is the tangent position of the arc weld in the area. Therefore, the correction pendulum 7 extended by the two guide wires 71 and located in the same plane will also deflect to an angle tangent to the arc weld. At the same time, Fig. 9 and Fig.10As shown, when the angle of the deflection-correcting pendulum 7 changes, the deflection-correcting pendulum 7 will deflect with the common central axis of the inner guide line 71 and the lower telescopic column 8 as the axis, and when the deflection-correcting pendulum 7 deflects, the slide rail inside it will adaptively push the annular positioning member 72 in the deflection direction (longitudinal direction, parallel to the upper longitudinal plate 2), and the annular positioning member 72 is restricted by the position of the robot arm 6 and cannot move horizontally (in the direction parallel to the upper transverse plate 3), so the annular positioning member 72 will push the high-speed motor 61 and the robot arm 6 through the stir friction welding head 62 after being pushed, so that the robot arm 6 drives the upper transverse plate 3 to slide adaptively along the outer wall of the upper guide column 31 and drives the insertion rod 73 to adaptively extend and retract to meet the rotation needs of the deflection-correcting pendulum 7;

[0050] Subsequently, the servo motor 22 and the high-speed motor 61 are started. Similarly, the one-way screw 21 generates a horizontal thrust along the direction of the weld to the robot arm 6 and the stir friction welding head 62 below through the upper longitudinal plate 2. However, the deflection angle (longitudinal displacement) of the stir friction welding head 62 is regulated by the correcting pendulum 7, and the angle of the correcting pendulum 7 is regulated by two guide wires 71. At the same time, the two guide wires 71 will always be at an angle tangent to the arc weld. Therefore, the external U-shaped correcting pendulum 7 will always ensure an angle tangent to the arc of the weld. That is to say, the stir friction welding head 62 will always be at an angle between the correcting pendulum 7 and the arc joint. The tangent point position, and the two guide wires 71 will change their angles at all times as the curvature of the arc joint changes when moving along the weld. Therefore, the stir friction welding head 62 will also change the tangent point position (lateral position) at all times under the compulsion of the correction pendulum 7, so that the stir friction welding head 62 can move strictly according to the tangent point position of the arc joint, with high welding accuracy, suitable for irregular weld connections of high-precision workpieces, and a high degree of automation. It can move strictly according to the tangent point position of the arc joint and can adaptively change with the change of curvature, and can also adapt to the welding of alternating arc joints and straight joints.

[0051] 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 high-precision friction stir welding machine, characterized in that: The invention comprises a C-shaped frame (1) formed by connecting an upper right-angle plate and a lower right-angle plate, a friction stir welding head (62) suspended and movably connected to the upper right-angle plate, and a positioning mechanism installed in the opening area of ​​the C-shaped frame (1), wherein a non-operating end of the friction stir welding head (62) is provided with a correction pendulum (7) which is telescopically movably connected to the lower right-angle plate and can adaptively deflect and flexibly adjust the welding position of the friction stir welding head (62) according to the weld, and a telescopic column (8) movably connected to the lower right-angle plate is hinged at the lower end of the correction pendulum (7); The two right-angled sides of the upper right-angle plate are respectively fitted with an upper longitudinal plate (2) and an upper transverse plate (3) vertically arranged thereon, and the end thread of the upper longitudinal plate (2) is penetrated by a one-way screw rod (21) installed on the upper surface of the upper right-angle plate, and the upper longitudinal plate (2) and the upper transverse plate (3) are arranged vertically in a spatially staggered manner so as to fit each other, and the interiors of the upper longitudinal plate (2) and the upper transverse plate (3) are provided with sliding grooves therethrough, and a mechanical arm (6) is fitted in a spatially overlapping area of ​​the sliding grooves inside the upper longitudinal plate (2) and the upper transverse plate (3), and a retaining ring fitted to the upper surface of the upper longitudinal plate (2) and the lower surface of the upper transverse plate (3) is symmetrically fixed on the outer wall of the mechanical arm (6); The telescopic adjustment end of the mechanical arm (6) is connected to a high-speed motor (61), and the friction stir welding head (62) is connected to the output end of the high-speed motor (61); An annular positioning member (72) is installed on the outer wall bearing of the friction stir welding head (62), and an insertion rod (73) is horizontally penetrated at the end of the deviation correcting swing member (7), and the end of the insertion rod (73) is fixedly connected to the side wall of the annular positioning member (72), and the annular positioning member (72) is slidably arranged in a slide rail that is opened through the upper end of the deviation correcting swing member (7); A first spring (74) is wound around the outer wall of the insertion rod (73), and one end of the first spring (74) is welded to the end of the insertion rod (73), and the other end of the first spring (74) is fixed to the outer wall of the deviation-correcting pendulum (7). The deviation-correcting pendulum (7) is U-shaped, and two inner and outer guide wires (71) are vertically arranged between the U-shaped ends of the deviation-correcting pendulum (7), both of which are located in the weld and are used to position the friction stir welding head (62).

2. A high-precision friction stir welding machine according to claim 1, characterized in that: A servo motor (22) is mounted on the end of the one-way screw rod (21), and an upper guide column (31) mounted on the upper surface of the upper right-angle plate is slidably penetrated through the end of the upper horizontal plate (3).

3. A high-precision friction stir welding machine according to claim 1, characterized in that: The guide wire (71) is made of a high-strength material that is resistant to high temperatures, and the central axis of the telescopic column (8) coincides with the central axis of the inner guide wire (71).

4. A high-precision friction stir welding machine according to claim 1, characterized in that: The two right-angled sides of the lower right-angled plate are respectively fitted with a lower longitudinal plate (4) and a lower transverse plate (5) vertically arranged thereon, and the ends of the lower longitudinal plate (4) and the lower transverse plate (5) are both slidably penetrated by lower guide columns (11) installed on the upper surfaces of the two right-angled sides of the lower right-angled plate.

5. A high-precision friction stir welding machine according to claim 4, characterized in that: The lower longitudinal plate (4) and the lower transverse plate (5) are arranged vertically in a spatially displaced manner so as to fit each other, and a sliding groove is provided inside the lower longitudinal plate (4) and the lower transverse plate (5), and the lower end of the telescopic column (8) is clamped and arranged in a spatially overlapping area of ​​the sliding groove inside the lower longitudinal plate (4) and the lower transverse plate (5); The outer wall of the telescopic column (8) is symmetrically fixed with a retaining ring that fits the upper surface of the lower longitudinal plate (4) and the lower surface of the lower transverse plate (5).

6. A high-precision friction stir welding machine according to claim 1, characterized in that: The positioning mechanism comprises a fixedly mounted T-shaped plate (9), a bidirectional screw rod (91) mounted on the side of the T-shaped plate (9), and a side clamping plate (92) symmetrically threadedly mounted on the outer wall of the bidirectional screw rod (91) for clamping the workpiece, the side wall of the T-shaped plate (9) is provided with a groove for limiting the side clamping plate (92), and an adjusting rod (94) is threadedly mounted at the center of the T-shaped plate (9), and the ends of the adjusting rod (94) are symmetrically hinged to L-shaped supporting plates (93) for respectively supporting two welding workpieces.

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