An aluminum plate manufactured by friction stir welding and a friction stir welding apparatus thereof

Abstract

The application relates to the field of electrical connectors, in particular to an aluminum bar made by friction stir welding and a friction stir welding device thereof, which comprises connecting parts and a framework, the connecting parts are arranged as two, the two connecting parts are respectively arranged at two ends of the framework and are connected with the framework, the connecting parts are made of metal with stable chemical properties, the framework is made of metal with small density, and connecting holes are arranged on the connecting parts. The application has the effects of making the electrical bar light and stable.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electrical connectors, in particular to an aluminum bar made by friction stir welding and a friction stir welding device thereof. BACKGROUND

[0002] With the development of new energy vehicles in China, the demand for lightweight of vehicles is higher and higher, and the competition for cost saving of major vehicle manufacturers is more and more intense, so the vehicle wiring harness industry will also develop towards low cost and lightweight.

[0003] The battery electrode connecting bar is a commonly used electrical connector in the field of vehicle wiring harness. Specifically, a plurality of batteries of a new energy vehicle are hard connected through the connecting bar, and the two ends of the connecting bar are fixed on the electrode sheets of the batteries by screws. The connecting bar mainly includes a copper bar and an aluminum bar. The copper bar has stable chemical properties and high structural strength. The aluminum bar is light in weight and low in cost, but its properties are not stable enough and is prone to electrochemical corrosion during use.

[0004] How to reduce the quality of the connecting bar and ensure the stability of the connecting bar itself during use is a major research focus in the automotive industry. SUMMARY

[0005] In order to reduce the quality of the connecting bar and ensure the stability of the terminal of the vehicle wiring harness during use, the application provides an aluminum bar made by friction stir welding and a friction stir welding device thereof.

[0006] In one aspect

[0007] The aluminum bar made by friction stir welding and the friction stir welding device thereof provided by the application adopt the following technical solutions:

[0008] The aluminum bar made by friction stir welding comprises a connecting part and a framework. The connecting part is provided in two, and the two connecting parts are respectively located at the two ends of the framework and connected with the framework. The connecting part is made of a metal with stable chemical properties. The framework is made of a metal with small density. The connecting part is provided with a connecting hole.

[0009] By adopting the above technical solutions, when the bar is used, the two connecting parts correspond to two electrodes, a screw is arranged in the connecting hole, the screw is threadedly connected to the electrode and presses the connecting part to realize the connection between the bar and the electrode. The connecting part is made of a metal with stable chemical properties, so that the bar is not prone to electrochemical corrosion. The framework is made of a metal with small density, the mass of the bar as a whole is controlled, and the bar has the advantages of stability and light weight.

[0010] On the other hand, the friction stir welding device provided by the application adopts the following technical solutions:

[0011] The utility model provides a kind of friction stir welding equipment, including machine table, spindle system installed on machine table and stir head installed on spindle system, the spindle system includes mounting frame installed on machine table and two vertical setting rotary shafts installed on mounting frame, two the rotary shafts are horizontally parallel spaced apart, and the vertical distance between two rotary shaft axes is same with the length of skeleton, the stir head corresponding rotary shaft is set to two, and is installed on the rotary shaft, the rotary shaft rotation can drive the stir head rotation.

[0012] By adopting the above technical scheme, the rotary shaft rotation drives the stir head rotation, the distance between two rotary shafts is equal to the length of the skeleton, so that the two stir head ends can correspond to the gap (connection seam) between the connecting part and the skeleton. Through the movement between the wire row and the stir head, synchronous welding of the two connecting parts can be realized, and the production efficiency of the wire row is improved.

[0013] Optionally, the spindle system further includes an adjusting assembly, the adjusting assembly includes two adjusting columns corresponding to the rotary shafts, the adjusting columns are slidingly connected to the mounting frame in the horizontal direction, and the two rotary shafts are rotatably connected to the two adjusting columns respectively. The sliding adjusting column can drive the two adjusting columns to move closer to or away from each other.

[0014] By adopting the above technical scheme, the sliding adjusting column moves the two adjusting columns closer to or away from each other, thereby changing the distance between the two rotary shafts and realizing welding of wire rows of different specifications.

[0015] Optionally, the spindle system further includes a linkage assembly, the linkage assembly includes a belt wheel and a belt ring, the belt wheel corresponding to the rotary shaft is set to two, and the belt ring is wound around the two belt wheels.

[0016] By adopting the above technical scheme, the two rotary shafts can be synchronously rotated by the friction force between the belt wheel and the belt ring.

[0017] Optionally, the spindle system further includes an adaptive assembly, a plane coinciding with the two rotary shafts is defined as a median plane, the adaptive assembly includes a stabilizing wheel, the stabilizing wheel is arranged on one side of the median plane and can move in a direction perpendicular to the median plane, and the stabilizing wheel is located inside the belt ring.

[0018] By adopting the above technical scheme, when the two rotary shafts move closer to or away from each other, the tension of the belt can be adjusted by moving the position of the stabilizing wheel, the friction between the belt and the belt wheel is maintained, and the stability during the rotation of the rotary shaft is improved.

[0019] Optionally, the adapting assembly further comprises two rotating rods, the two rotating rods are rotatably connected at one end close to each other, and rotatably connected at the other end far from each other on the two adjusting columns, and the stabilizing wheel is rotatably connected at the end of the rotating rod far from the adjusting column.

[0020] By adopting the above technical scheme, during the process of the two adjusting columns approaching or moving away from each other, the rotating rod rotates relatively, so as to automatically drive the stabilizing wheel to approach or move away from the median plane, and the friction between the belt wheel and the belt is maintained.

[0021] Optionally, a clamp is arranged on the workbench, the clamp comprises a fixed block, a profiling groove for placing a workpiece is arranged on the fixed block, an accommodating cavity is arranged in the fixed block, and a preheating assembly is arranged in the accommodating cavity and used for heating the workpiece.

[0022] By adopting the above technical scheme, the profiling groove is arranged on the fixed block, and the profiling groove can limit the workpiece (here, the wire row), thereby improving the stability during the welding of the wire row. Meanwhile, the preheating assembly heats the workpiece, thereby facilitating the welding of the workpiece by the stirring head.

[0023] Optionally, the preheating assembly comprises a coil and a core, the core is arranged below the profiling groove, and the coil is arranged outside the core.

[0024] By adopting the above technical scheme, when the coil passes through an alternating current, eddy current is generated in the core, so that heat is generated in the core to heat the workpiece. Meanwhile, the magnetic field changes at both ends of the core, so that induced current is generated in the workpiece, and the electromagnetic force can stir the material during the welding, thereby improving the welding effect.

[0025] Optionally, the core can slide in the vertical direction, a thermal deformation member is arranged at one end of the core close to the ground, the thermal deformation member is arranged in a direction perpendicular to the core, one end of the thermal deformation member is connected to the core, and when the thermal deformation member is heated, the end of the thermal deformation member far from the core can bend downward.

[0026] By adopting the above technical scheme, in a normal state, the core is located away from the workpiece, when welding of the workpiece is needed, the temperature of the core rises, the thermal deformation member deforms, and abuts against the side wall of the accommodating groove close to the ground, the core is driven to move upward and close to the workpiece under the interaction between the thermal deformation member and the side wall of the accommodating groove, so as to heat the workpiece. Meanwhile, after the coil is powered off, the core moves downward and away from the workpiece, thereby improving the cooling speed of the workpiece.

[0027] Optionally, the iron core is capable of sliding along a direction horizontal to and perpendicular to the length direction of the profiling groove, a concomitant assembly is arranged in the accommodating cavity, the concomitant assembly comprises a fixed cylinder and a piston, the piston is slidingly fitted in the fixed cylinder, the iron core is connected with the piston, the fixed cylinder is filled with a thermal expansion liquid, and the fixed cylinder is capable of exchanging heat with the workpiece.

[0028] By adopting the technical scheme, during the welding process, the iron core is capable of moving along the length direction of the joint, the material at the joint of the workpiece is heated by moving the iron core, and the overall welding effect is improved. Meanwhile, the iron core heats the workpiece, the fixed cylinder is heated after the workpiece is heated, and the iron core is driven to move along with the expansion of the thermal expansion liquid, so that the iron core automatically moves along with the movement of the stirring head, and the welding effect is further improved. In addition, after the workpiece is removed, the cold contraction of the thermal expansion member can drive the iron core to automatically reset. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the overall structure schematic diagram of a wire row of the embodiment of the present application.

[0030] Figure 2 is the overall structure schematic diagram of a friction stir welding device of the embodiment of the present application.

[0031] Figure 3 is the structure schematic diagram of a spindle system of the embodiment of the present application.

[0032] Figure 4 is the structure schematic diagram of a clamp of the embodiment of the present application.

[0033] Figure 5 is the structure schematic diagram of a preheating assembly of the embodiment of the present application. Figure 4 is the enlarged view of part A of the above figure.

[0034] Figure 6 is the structure schematic diagram of a preheating assembly of the embodiment of the present application.

[0035] Figure 7 is the structure schematic diagram of a transition piece of the embodiment of the present application.

[0036] Figure 8 is the structure schematic diagram of a concomitant assembly of the embodiment of the present application.

[0037] Label: 1, connecting part; 11, connecting hole; 2, skeleton; 21, insulation layer; 3, machine table; 31, workbench; 4, main shaft system; 41, mounting frame; 42, rotating shaft; 43, adjusting assembly; 431, adjusting column; 432, adjusting rod; 44, linkage assembly; 441, pulley; 442, belt ring; 45, adaptive assembly; 451, rotating rod; 452, stabilizing wheel; 5, clamp; 51, fixed block; 52, profiling groove; 53, accommodating cavity; 6, preheating assembly; 61, coil; 62, iron core; 63, thermal deformation piece; 64, heat conduction piece; 65, avoidance groove; 66, transition piece; 661, first connecting ring; 662, second connecting ring; 663, transition cylinder; 67, mounting cylinder; 7, accompanying assembly; 71, fixed cylinder; 72, piston; 73, buffer shell; 74, connecting piece; 741, horizontal rod; 742, vertical rod; 743, connecting rod; 8, stirring head. DETAILED DESCRIPTION

[0038] The following will be described in detail in combination with the accompanying drawings Figures 1-8 The application is further described in detail.

[0039] The application discloses an aluminum wire made by friction stir welding

[0040] Referring to Figure 1 An aluminum wire made by friction stir welding includes connecting parts 1 and a skeleton 2. The connecting parts 1 are provided in two, and the two connecting parts 1 are respectively arranged on the two sides of the skeleton 2, and the connecting parts 1 are used for being connected with electrode sheets of a battery or other equipment. The skeleton 2 is used for connecting the two connecting parts 1. In the embodiment, the skeleton 2 is a rectangular plate structure, and in other embodiments, the skeleton 2 can be provided in other shapes according to actual conditions, for example, Z-shaped, L-shaped, etc. The connecting parts 1 are made of copper, and the skeleton 2 is made of aluminum. In the use process of the wire, the connecting parts 1 made of copper are in contact with electrodes, the chemical stability of the copper is utilized to reduce the phenomenon of electrochemical corrosion of the wire, and meanwhile, the aluminum skeleton 2 is adopted to reduce the overall mass of the wire, so that the stability of the wire in the use process is effectively ensured while the mass of the wire is reduced.

[0041] Referring to Figure 1 The connecting parts 1 and the skeleton 2 are both plate structures, the thicknesses of the two are equal, and the two are connected by means of friction welding. The skeleton 2 is wrapped with an insulation layer 21, and in the embodiment, the insulation layer 21 is rubber. The connecting parts 1 are provided with connecting holes 11, so that screws can be conveniently arranged.

[0042] The implementation principle of the aluminum wire made by friction stir welding in the embodiment of the application is as follows: the wire is divided into two parts, the part in contact with electrodes, that is, the connecting parts 1, is made of a metal with stable chemical properties, so as to reduce the electrochemical corrosion of the wire in the use process. The skeleton 2 is made of a light metal material, so as to control the overall mass of the wire.

[0043] The embodiment of the present application also discloses a friction stir welding device

[0044] Referring to Figure 2 and Figure 3 The friction stir welding device comprises a machine table 3, a spindle system 4 and a stirring head 8. The stirring head 8 is installed on the spindle system 4, and the spindle system 4 is used for driving the stirring head 8 to rotate. A workbench 31 is arranged on the machine table 3, and the workbench 31 is used for placing a workpiece. In the process of welding the wire row, the connecting part 1 is placed at two ends of the framework 2, and the connecting part 1 is in abutment with the framework 2. Then the spindle system 4 drives the stirring head 8 to rotate at a high speed and gradually approaches the wire row. Until the welding pin on the stirring head 8 drills into the gap between the connecting part 1 and the framework 2, and the shoulder of the stirring head 8 is in close contact with the surface of the connecting part 1 and the surface of the framework 2. The heat generated by the friction between the welding pin on the stirring head 8 and the surrounding base material and the heat generated by the friction between the shoulder of the stirring head 8 and the surface of the welding part jointly act on the material at the joint (the gap between the connecting part 1 and the framework 2) to increase the temperature of the material and soften the material. Then the stirring head 8 or the wire row moves along the length of the gap between the connecting part 1 and the framework 2, the softened material flows to the rear of the stirring head 8 relative to the direction of movement of the workpiece, and a dense and firm welding joint is formed, thereby realizing the welding between the connecting part 1 and the framework 2.

[0045] Referring to Figure 2 and Figure 3 The spindle system 4 comprises a mounting frame 41 and two rotating shafts 42. The mounting frame 41 is installed on the machine table 3 and can be lifted and moved in the horizontal direction. The rotating shafts 42 are vertically installed on the mounting frame 41 and can rotate around their own axes. The two rotating shafts 42 are arranged in parallel and spaced apart in the horizontal direction, and the vertical distance between the axes of the two rotating shafts 42 is equal to the size of the framework 2 in the length direction. The stirring head 8 is installed below the rotating shaft 42, and the rotating shaft 42 and the stirring head 8 can be fixed by a three-jaw chuck (not shown in the figure) or can be clamped and fixed by other ways. In the process of welding the wire row, the stirring heads 8 on the two rotating shafts 42 correspond to the two connecting seams, and then the workbench 31 or the spindle system 4 can be moved by the electric control system of the friction stir welding device to realize the synchronous welding between the two connecting parts 1 and the framework 2, thereby improving the welding efficiency of the wire row.

[0046] Referring to Figure 2 and Figure 3The spindle system 4 further comprises an adjusting assembly 43, the adjusting assembly 43 comprises two adjusting columns 431 arranged corresponding to the rotating shafts 42, the adjusting columns 431 are slidingly connected to the mounting frame 41 along the horizontal direction. A through hole is arranged in the adjusting column 431 corresponding to the rotating shaft 42, and the rotating shaft 42 is rotationally fitted in the through hole. The sliding adjusting column 431 can make the two adjusting columns 431 approach or move away from each other, thereby driving the two rotating shafts 42 to approach or move away from each other, so that the friction welding device can weld wire rows of different specifications.

[0047] With reference to Figure 2 and Figure 3 The adjusting assembly 43 further comprises an adjusting rod 432, the adjusting rod 432 is arranged along the sliding direction of the adjusting column 431, the adjusting rod 432 is arranged between the two adjusting columns 431, and the two ends of the adjusting rod 432 are threadedly connected with the two adjusting columns 431 respectively. Rotating the adjusting rod 432 can drive the two adjusting columns 431 to approach or move away from each other synchronously, thereby adjusting the position of the adjusting column 431.

[0048] With reference to Figure 2 and Figure 3 The spindle system 4 further comprises a linkage assembly 44, the linkage assembly 44 comprises a belt wheel 441 and a belt ring 442, the belt wheel 441 is arranged corresponding to the rotating shaft 42 as two, the belt wheel 441 is fixedly sleeved on the rotating shaft 42, and the belt ring 442 is wound on the two belt wheels 441 to realize synchronous rotation of the two rotating shafts 42. The linkage assembly 44 further comprises an adaptive assembly 45, the adaptive assembly 45 comprises two rotating rods 451 arranged corresponding to the adjusting columns 431, one end of the rotating rod 451 is rotationally connected to the adjusting column 431, and the rotating axis between the rotating rod 451 and the adjusting column 431 is parallel to the axis of the rotating shaft 42. The ends of the two rotating rods 451 away from the adjusting columns 431 are close to each other and are rotationally connected to each other. The adaptive assembly 45 further comprises a stabilizing wheel 452, the rotating axis between the stabilizing wheel 452 and the two rotating rods 451 is coaxial, and the stabilizing wheel 452 is rotationally connected to the rotating rod 451. A median plane is defined as a plane coinciding with the axes of the two rotating shafts 42, and the adaptive assembly 45 is symmetrically arranged as two groups about the median plane. The belt ring 442 is wound on the two stabilizing wheels 452 and the two belt wheels 441 at the same time. When the two adjusting columns 431 approach each other, the rotating rod 451 drives the two stabilizing wheels 452 to move away from each other, and when the two adjusting columns 431 move away from each other, the two stabilizing wheels 452 move close to each other, so that the belt ring 442 and the belt wheel 441 can be kept in a state of tension, thereby improving the stability of the rotating shaft 42 during rotation.

[0049] With reference to Figure 2 and Figure 4The workbench 31 is provided with a clamp 5 for placing the wire row, and the clamp 5 comprises a fixed block 51 fixed on the workbench 31. The clamp 5 is provided with a profiling groove 52 corresponding to the wire row in whole, and the wire row can be embedded in the profiling groove 52, so as to limit the wire row and improve the stability of the connecting part 1 and the framework 2 in the welding process.

[0050] With reference to Figure 4 and Figure 5 , the fixed block 51 is provided with an accommodating cavity 53 corresponding to the positions of the two connecting seams of the wire row, and the accommodating cavity 53 is provided with a preheating assembly 6, which comprises a coil 61 and a core 62. The core 62 is vertically arranged in the accommodating cavity 53, and the coil 61 is arranged outside the core 62. The core 62 is arranged corresponding to the profiling groove 52, and after the wire row is embedded in the profiling groove 52, the core 62 corresponds to the connecting part 1 between the connecting part 1 and the framework 2, so as to preheat the position where the framework 2 and the connecting part 1 are connected, so as to facilitate the welding of the wire row by the stirring head 8. On the other hand, the alternating current flows through the coil 61, and the two ends of the core 62 generate a changing magnetic field, which in turn generates an induced current in the wire row. The softened material can move under the action of electromagnetic force to achieve stirring effect and improve the effect of friction welding.

[0051] With reference to Figure 4 and Figure 5 , the core 62 can move along the length direction of itself, and the sliding core 62 can move close to or away from the profiling groove 52. When the wire row needs to be heated, the core 62 is moved close to the wire row to improve the heating speed of the wire row, thereby improving the production efficiency. After the welding of the wire row is completed, the core 62 is controlled to move away from the wire row, so as to accelerate the cooling speed of the wire row and facilitate the disassembly of the wire row.

[0052] With reference to Figure 4 and Figure 6 , the preheating assembly 6 further comprises a mounting cylinder 67, which is a cylindrical structure with two open ends. The mounting cylinder 67 is mounted on the side wall of the accommodating cavity 53 and is slidably arranged on the core 62 to realize the sliding of the core 62 in the vertical direction. The preheating assembly 6 further comprises a thermal deformation piece 63, which is a sheet structure perpendicular to the length of the core 62. One end of the thermal deformation piece 63 is connected to the side of the core 62 close to the ground, and the other end abuts against the side wall of the accommodating cavity 53.

[0053] With reference to Figure 4 and Figure 6When the thermal deformation piece 63 is heated, the end thereof away from the iron core 62 can bend towards the ground. Further, under the interaction between the thermal deformation piece 63 and the side wall of the accommodating cavity 53, the iron core 62 can be driven to move away from the ground, i.e., towards the wire array. In the actual welding process, the coil 61 is powered on, and eddy current is generated in the iron core 62, and then the temperature of the iron core 62 rises. The temperature rise of the iron core 62 can be transmitted to the thermal deformation piece 63, and then the thermal deformation piece 63 automatically deforms to drive the iron core 62 to approach the wire array, thereby achieving the heating of the wire array. After the welding of the wire array is completed, the coil 61 is powered off, and the temperature of the iron core 62 decreases, and then the thermal deformation piece 63 drives the iron core 62 to move downward, so that the iron core 62 moves away from the wire array.

[0054] With reference to Figure 4 and Figure 6 , in the embodiment, the thermal deformation piece 63 is a bimetallic strip (a composite material composed of two or more metals or other materials with suitable properties, the thermal expansion coefficients of the layers are different, and when the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the whole bimetallic strip bends towards the passive layer).

[0055] With reference to Figure 6 and Figure 7 , the transition piece 66 is arranged between the thermal deformation piece 63 and the iron core 62. The transition piece 66 includes a first connecting ring 661, a second connecting ring 662 and a transition cylinder 663. The first connecting ring 661 and the second connecting ring 662 are both annular structures. The first connecting ring 661 is attached to and fixedly connected with the end face of the iron core 62. The second connecting ring 662 is arranged below the first connecting ring 661, and the outer side wall of the second connecting ring 662 is greater than the diameter of the iron core 62. The transition cylinder 663 is in the shape of a circular truncated cone, one end of which is connected with the first connecting ring 661, and the other end of which is connected with the second connecting ring 662. The transition piece 66 connects the thermal deformation piece 63, provides a larger installation space for the thermal deformation piece 63, and facilitates the heat exchange between the thermal deformation piece 63 and the iron core 62.

[0056] With reference to Figure 6 and Figure 7 , the side wall of the profiling groove 52 is provided with a through hole communicating with the accommodating cavity 53, and the through hole is filled with a heat conduction piece 64. The heat conduction piece 64 is made of an insulating material with good thermal conductivity, such as aluminum oxide ceramic. When the iron core 62 slides, the end face can be attached to the heat conduction piece 64 to transfer heat to the wire array. At the same time, the heat conduction piece 64 can better support the wire array and resist the axial force of the stirring head 8 abutting on the wire array.

[0057] With reference to Figure 4 and Figure 5The heat deformed piece 63 is perpendicular to the core 62 at normal temperature, and the accommodating cavity 53 is provided with an avoiding groove 65 corresponding to the position of the heat deformed piece 63 on the side wall of the accommodating cavity 53. The heat deformed piece 63 is located in the avoiding groove 65. The avoiding groove 65 is provided with a sliding groove on the two side walls parallel to the length direction of the heat deformed piece 63, and the heat deformed piece 63 is provided with a cylindrical adjusting column corresponding to the sliding groove. The end of the adjusting column away from the heat deformed piece 63 is inserted into the sliding groove, and the length direction of the sliding groove is parallel to the ground. The adjusting column can slide in the sliding groove to adapt to the relative movement of the adjusting column in the deformation process of the heat deformed piece 63.

[0058] With reference to Figure 4 and Figure 5 , the mounting cylinder 67 can slide in the direction perpendicular to the length direction of the profiling groove 52, thereby driving the core 62 to move, so that the core 62 can heat different positions of the wire row in a targeted manner. The length direction of the heat deformed piece 63 is parallel to the sliding direction of the mounting cylinder 67, and the length direction of the avoiding groove 65 corresponds to the heat deformed piece 63. One end of the heat deformed piece 63 is located in the avoiding groove 65, which can limit the rotation of the core 62 and improve the stability of the core 62 in the movement process.

[0059] With reference to Figure 4 and Figure 8 , the accommodating cavity 53 is also provided with a following assembly 7 for driving the mounting cylinder 67 to move. The following assembly 7 comprises a fixed cylinder 71 and a piston 72. The piston 72 is slidingly fitted in the fixed cylinder 71, and the fixed cylinder 71 is filled with a thermal expansion liquid, which is mercury in this embodiment. The piston 72 is connected with the mounting cylinder 67, and the fixed cylinder 71 is located close to the profiling groove 52. In the actual welding process, the coil 61 is electrified, the core 62 generates heat and moves upward to abut against the heat conducting piece 64, and then the wire row is heated. After the wire row is heated, the heat is transferred to the fixed cylinder 71. Then the mercury expands to drive the piston 72 to move. At this time, the piston 72 can drive the mounting cylinder 67 to move automatically, thereby realizing the automatic movement of the mounting cylinder 67. As the core 62 continuously heats different positions of the wire row, the mercury absorbs more and more heat and continuously expands to drive the piston 72 to move. Then the coil 61 is de-energized, the wire row cools down, the piston 72 is reset, and the mounting cylinder 67 is automatically reset to facilitate welding again.

[0060] With reference to Figure 4 and Figure 8 , the following assembly 7 further comprises a buffer shell 73. The buffer shell 73 is arranged above the fixed cylinder 71, and the buffer shell 73 is hollow inside and filled with mercury. The inside of the buffer shell 73 communicates with the inside of the fixed cylinder 71, and the mercury in the buffer shell 73 can enter the fixed cylinder 71 to drive the piston 72 to move. The buffer shell 73 is flush with the side wall of the profiling groove 52 close to the ground, and the wire row can be attached to the buffer shell 73 after being placed in the profiling groove 52.

[0061] With reference to Figure 4 andFigure 8 A connecting piece 74 is arranged between the piston 72 and the mounting cylinder 67, and the connecting piece 74 comprises a horizontal rod 741, vertical rods 742 and a connecting rod 743. The vertical rods 742 are arranged on both sides of the fixing cylinder 71 along a direction horizontal to the sliding direction of the mounting cylinder 67, and are in sliding fit connection with the fixing cylinder 71. The horizontal rod 741 is arranged at one end of the fixing cylinder 71 and between the two vertical rods 742, and the two ends of the horizontal rod 741 are integrally formed with the two vertical rods 742 to form a U-shaped structure. The connecting rod 743 is arranged between the piston 72 and the horizontal rod 741, and the two ends of the connecting rod 743 are fixedly connected with the piston 72 and the horizontal rod 741 respectively, so as to realize the connection between the piston 72 and the mounting cylinder 67.

[0062] With reference to Figure 4 And Figure 5 The two groups of accompanying assemblies 7 are arranged on both sides of the trajectory of the mounting cylinder 67 in the sliding direction, and drive the mounting cylinder 67 to move from both sides of the mounting cylinder 67, so as to improve the stability of the mounting cylinder 67 during movement.

[0063] With reference to Figure 4 And Figure 8 A connecting pipe is arranged between the two buffer shells 73 in the two groups of accompanying assemblies 7, and the two ends of the connecting pipe are in communication with the interiors of the two buffer shells 73 respectively, so as to equalize the pressure in the two buffer shells 73, improve the uniformity of the force received by the mounting cylinder 67, and further improve the stability of the mounting cylinder 67 during movement.

[0064] The implementation principle of the embodiment of the application is that the two rotating shafts 42 drive the two stirrers 8 to rotate, and the two stirrers 8 simultaneously perform stir friction welding on the two connecting parts 1, so as to improve the efficiency of linear row welding forming.

[0065] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape and principle of the application shall be covered within the protection scope of the application.

Claims

1. A friction stir welding apparatus for welding aluminum busbars, characterized in that, The aluminum busbar includes a connecting part (1) and a frame (2). The connecting part (1) is configured as two parts, and the two connecting parts (1) are located at both ends of the frame (2) and connected to the frame (2). The connecting part (1) is made of a chemically stable metal, and the frame (2) is made of a low-density metal. The connecting part (1) is provided with a connecting hole (11). The welding equipment includes a machine base (3), a spindle system (4) mounted on the machine base (3), and a stirring head (8) mounted on the spindle system (4). The spindle system (4) includes a mounting frame (41) mounted on the machine base (3) and two vertically arranged rotating shafts (42) mounted on the mounting frame (41). The two rotating shafts (42) are arranged parallel to each other in the horizontal direction, and the vertical distance between the axes of the two rotating shafts (42) is the same as the length of the skeleton (2). The stirring head (8) is set to correspond to the rotating shafts (42) and is mounted on the rotating shafts (42). The rotation of the rotating shafts (42) can drive the stirring head (8) to rotate. The machine base (3) is provided with a workbench (31), and a fixture (5) is provided on the workbench (31). The fixture (5) includes a fixing block (51), and a contour groove (52) for placing the workpiece is provided on the fixing block (51). A receiving cavity (53) is provided inside the fixing block (51), and a preheating component (6) is provided inside the receiving cavity (53). The preheating component (6) is used to heat the workpiece. The preheating assembly (6) includes a coil (61) and an iron core (62), the iron core (62) being disposed below the contour groove (52), and the coil (61) being wound around the outside of the iron core (62); The iron core (62) can slide in the vertical direction. A heat-deformable member (63) is provided at one end of the iron core (62) near the ground. The heat-deformable member (63) is arranged in a direction perpendicular to the iron core (62) and one end is connected to the iron core (62). When the heat-deformable member (63) is heated, the end away from the iron core (62) can bend downward. The iron core (62) can slide along a horizontal direction that is perpendicular to the length of the contoured groove (52). An accompanying component (7) is provided in the receiving cavity (53). The accompanying component (7) includes a fixed cylinder (71) and a piston (72). The piston (72) is slidably fitted in the fixed cylinder (71). The iron core (62) is connected to the piston (72). The fixed cylinder (71) is filled with a thermally expanding liquid. The fixed cylinder (71) can exchange heat with the workpiece.

2. The friction stir welding equipment for welding aluminum busbars according to claim 1, characterized in that: The spindle system (4) also includes an adjustment assembly (43), which includes two adjustment columns (431) arranged on corresponding rotating shafts (42). The adjustment columns (431) are slidably connected to the mounting bracket (41) in the horizontal direction. The two rotating shafts (42) are rotatably connected to the two adjustment columns (431) respectively. The sliding adjustment column (431) can drive the two adjustment columns (431) to move closer to or further away from each other.

3. The friction stir welding equipment for welding aluminum busbars according to claim 2, characterized in that: The spindle system (4) also includes a linkage assembly (44), which includes a pulley (441) and a belt ring (442). The pulley (441) is configured to correspond to two rotating shafts (42), and the belt ring (442) is wound around the two pulleys (441).

4. The friction stir welding equipment for welding aluminum busbars according to claim 3, characterized in that: The spindle system (4) also includes an adaptation component (45), which defines the plane that coincides with the two rotating shafts (42) as the mid-plane. The adaptation component (45) includes a stabilizing wheel (452), which is located on one side of the mid-plane and can move in a direction perpendicular to the mid-plane. The stabilizing wheel (452) is located inside the belt ring (442).

5. The friction stir welding apparatus for welding aluminum busbars according to claim 4, characterized in that: The adaptation component (45) also includes two rotating rods (451), with the ends of the two rotating rods (451) close to each other being rotatably connected, and the ends of the two rotating rods (451) far from each other being rotatably connected to two adjusting columns (431), and the stabilizing wheel (452) being rotatably connected to the end of the rotating rod (451) away from the adjusting column (431).

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