Friction stir welding device and welding equipment

Abstract

The invention relates to a friction stir welding device and welding equipment, the friction stir welding device comprises a welding unit, the welding unit comprises a main shaft assembly and a welding tool, the main shaft assembly is connected with the welding tool, the main shaft assembly is driven to rotate so as to drive the welding tool to act, and the welding tool is used for being in contact with a to-be-welded part; the driving unit comprises an internal combustion engine, and the output end of the internal combustion engine is in transmission connection with the main shaft assembly so as to drive the main shaft assembly to rotate; the driving unit further comprises a fuel tank, and the fuel tank is connected with the internal combustion engine so as to provide fuel for the internal combustion engine. The driving unit further comprises a transmission mechanism, an output shaft is arranged at the output end of the internal combustion engine, and the output shaft is connected with the main shaft assembly through the transmission mechanism. The friction stir welding machine is suitable for fight and other field severe environments, the friction stir welding main shaft is driven by the internal combustion engine to rotate, friction stir welding operation is achieved, and waste caused by energy conversion is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of friction stir welding, in particular to a friction stir welding device and welding equipment. Background Art

[0002] Friction stir welding is a green and environmentally friendly advanced welding technology. As an advanced welding technology, it can achieve metallurgical bonding below the melting point of metals. It has broad application prospects and development space. Friction stir welding technology has developed rapidly in recent years and is suitable for welding high-melting-point metals such as titanium alloys. Friction stir welding technology uses a rapidly rotating stirring head to penetrate into the workpiece to be welded, and generates heat by means of the friction effect between the stirring head and the workpiece material, so as to cause the local material to enter a thermoplastic state, thereby realizing the connection of the materials. During the welding operation, the workpiece is firmly fixed on the back pad, while the stirring head moves smoothly along the path of the workpiece joint while rotating at high speed. Under the strong forging pressure of the stirring head, the plasticized materials are closely mixed and squeezed together to form a strong and dense solid phase weld, thereby ensuring the metallurgical bonding between the workpieces. At present, this technology has been widely used in many fields such as shipbuilding, aerospace, rail transportation, automobile production and power industry. Especially in the field of aerospace, friction stir welding technology has successfully provided high-quality connection solutions for key components such as aircraft wing panels and launch vehicle fuel tanks. In the prior art, the friction stir welding spindle is usually driven by electricity, that is, the motor is driven by electricity to drive the welding tool on the friction stir welding spindle to rotate, so as to achieve the friction stir welding operation.

[0003] However, the deficiency of the existing technology is that in special circumstances such as no electricity in the wild, such as war zones or other harsh environments, there is no source of electricity. Even if electricity is generated through solar energy, generators, etc., it is difficult to obtain stable, high-power electricity, which makes it impossible to use an electrically driven friction stir welding spindle. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a friction stir welding device and welding equipment, which can drive the friction stir welding spindle through an internal combustion engine, thereby achieving friction stir welding operations without power supply.

[0005] In order to solve the above technical problems, the present invention provides a friction stir welding device, comprising: A welding unit, comprising a spindle assembly and a welding tool, wherein the spindle assembly is connected to the welding tool, the spindle assembly is driven to rotate to drive the welding tool to move, and the welding tool is used to contact the workpiece to be welded; The driving unit comprises an internal combustion engine, wherein the output end of the internal combustion engine is drivingly connected to the main shaft assembly to drive the main shaft assembly to rotate.

[0006] In one embodiment of the present invention, the driving unit further comprises a fuel tank, and the fuel tank is connected to the internal combustion engine to provide fuel to the internal combustion engine.

[0007] In one embodiment of the present invention, the driving unit further comprises a transmission mechanism, an output shaft is provided at the output end of the internal combustion engine, and the output shaft is connected to the main shaft assembly through the transmission mechanism.

[0008] In one embodiment of the present invention, the transmission mechanism includes a pulley assembly and a synchronous belt, the pulley assembly includes a first pulley and a second pulley, the first pulley is coaxially connected to the output shaft, the second pulley is coaxially connected to the main shaft assembly, and the synchronous belt is tensionedly connected to the first pulley and the second pulley to transmit power from the internal combustion engine to the main shaft assembly.

[0009] In one embodiment of the present invention, the spindle assembly includes a shell, an axis and a connecting piece, a portion of the axis is accommodated in the shell, and the axis is coaxially connected to the shell, one end of the axis is connected to the drive unit, and the other end of the axis is connected to the connecting piece, and the welding tool is installed on the connecting piece.

[0010] In one embodiment of the present invention, the spindle assembly further includes a bearing, an end cover and a locking piece, wherein the bearing is coaxially connected to the axis, the end cover is arranged at the end of the outer shell in the axial direction to close the outer shell, and the end cover is assembled to the outer shell through the locking piece.

[0011] In one embodiment of the present invention, a receiving cavity is provided between the shell and the shaft core, and the receiving cavity is filled with a coolant.

[0012] In one embodiment of the present invention, the spindle assembly further includes a liquid cooling device, and the liquid cooling device is disposed between the housing and the axis.

[0013] In one embodiment of the present invention, a gearbox is further included, wherein the input end of the gearbox is connected to the output end of the internal combustion engine, and the output end of the gearbox is connected to the main shaft assembly to adjust the rotation speed of the main shaft assembly.

[0014] The present invention also provides a welding device, including a friction stir welding device as described above, wherein the welding device includes a movable arm, and the friction stir welding device is assembled on the movable arm to move to a specified position under the drive of the movable arm.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art: A friction stir welding device described in the present invention is provided with a welding unit and a driving unit. The welding unit includes a spindle assembly and a welding tool. The welding tool is connected to the spindle assembly so as to rotate under the drive of the spindle assembly. The driving unit includes an internal combustion engine. The output end of the internal combustion engine is transmission-connected to the spindle assembly, thereby outputting kinetic energy to the spindle assembly, thereby driving the welding tool to move and perform a friction stir welding operation. The present invention does not require electricity for driving and can be applied to harsh field environments such as combat. The friction stir welding spindle is driven by the internal combustion engine to rotate to achieve a friction stir welding operation. In addition, the use of an internal combustion engine as a driving mechanism can directly convert the internal energy of the fuel into mechanical energy. Compared with the method of using an internal combustion engine to generate electricity and then driving the spindle assembly by electricity, the waste caused by energy conversion can be reduced. Therefore, the friction stir welding device of the present invention can improve energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention.

[0018] Figure 2 It is a schematic cross-sectional structure diagram of a spindle assembly and a transmission mechanism according to a preferred embodiment of the present invention.

[0019] Explanation of the reference numerals in the specification: 1. spindle assembly; 10. housing; 11. axis; 12. connecting piece; 13. bearing; 14. end cover; 15. locking piece; 2. welding tool; 3. drive unit; 30. internal combustion engine; 31. fuel tank; 32. synchronous belt; 33. first pulley; 34. second pulley. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0021] Friction stir welding technology has many advantages. Specifically, compared with fusion welding technology, friction stir welding can effectively avoid the generation of defects such as pores and cracks, thereby improving the quality of welded joints. Furthermore, by optimizing the design of the stirring head and welding parameters, the production efficiency of friction stir welding can be further improved. In addition, during the friction stir welding process, there is less material loss, so it has a higher material utilization rate.

[0022] From the details, the design of the stirring head cleverly combines the stirring needle and the shoulder: the shoulder provides sufficient heat through friction to plasticize the material in the welding area and effectively prevents the plasticized material from overflowing; the stirring needle not only generates part of the heat required for welding through friction, but also breaks the original butt joint of the base material to be welded through mechanical action, and vigorously stirs the surrounding materials, so that the materials on the butt joint and its surrounding areas can be fully mixed, and finally a weld core composed of tiny equiaxed grains with significant deformation characteristics is formed. Embodiment 1

[0023] Reference Figure 1 as well as Figure 2 As shown, the present invention discloses a friction stir welding device, comprising a welding unit, wherein the welding unit comprises a spindle assembly 1 and a welding tool 2, wherein the welding tool 2 is arranged at one end of the spindle assembly 1 along the axial direction. Therefore, when the spindle assembly 1 is driven to rotate, the welding tool 2 can be driven to move.

[0024] The welding tool 2 is used to contact with the workpiece to be welded.

[0025] The friction stir welding device further comprises a driving unit 3, wherein the driving unit 3 comprises an internal combustion engine 30, wherein an output end of the internal combustion engine 30 is drivingly connected to the spindle assembly 1 to drive the spindle assembly 1 to rotate, thereby driving the welding tool 2 to rotate.

[0026] It can be known that the friction stir welding device to be protected by the present invention is provided with a welding unit and a driving unit. The welding unit includes a spindle assembly and a welding tool. The welding tool is connected to the spindle assembly to rotate under the drive of the spindle assembly; the driving unit includes an internal combustion engine, and the output end of the internal combustion engine is transmission-connected to the spindle assembly, so as to output kinetic energy to the spindle assembly, thereby driving the welding tool to move and perform a friction stir welding operation. The present invention does not require electricity for driving, and can be applied to harsh field environments such as combat. The friction stir welding spindle is driven by the internal combustion engine to rotate to achieve a friction stir welding operation. In addition, the use of an internal combustion engine as a driving mechanism can directly convert the internal energy of the fuel into mechanical energy. Compared with the method of using an internal combustion engine to generate electricity and then driving the spindle assembly by electricity, the waste caused by energy conversion can be reduced. Therefore, the friction stir welding device of the present invention can improve energy utilization efficiency.

[0027] As a preferred embodiment, the driving unit 3 further includes a fuel tank 31 , and the fuel tank 31 is connected to the internal combustion engine 30 through a delivery pipeline to provide fuel to the internal combustion engine 30 .

[0028] Furthermore, the driving unit further comprises a transmission mechanism, and an output shaft 301 is provided at the output end of the internal combustion engine 30 , and the output shaft 301 is connected to the main shaft assembly 1 through the transmission mechanism.

[0029] As a preferred embodiment, the transmission mechanism includes a pulley assembly and a synchronous belt 32, the pulley assembly includes a first pulley 33 and a second pulley 34, the first pulley 33 is coaxially connected to the output shaft 301, and the second pulley 34 is coaxially connected to the main shaft assembly 1, and the synchronous belt 32 is tensionedly connected to the first pulley 33 and the second pulley 34, so that the second pulley 34 can rotate synchronously with the first pulley 33, so that the power of the internal combustion engine 30 is transmitted to the main shaft assembly 1.

[0030] As a preferred embodiment, the spindle assembly 1 includes a housing 10, an axis 11 and a connecting piece 12, a portion of the axis 11 is accommodated in the housing 10, and the axis 11 is coaxially connected to the housing 10. One end of the axis 11 is connected to the driving unit 3, and the other end of the axis 11 is connected to the connecting piece 12, and the welding tool 2 is installed on the connecting piece 12.

[0031] In detail, the connecting member 12 includes but is not limited to a knife handle.

[0032] Specifically, the shaft 11 is coaxially connected to the second pulley 34 , so that the shaft 11 can rotate under the drive of the second pulley 34 .

[0033] The spindle assembly 1 further includes a bearing 13, an end cover 14 and a locking member 15, wherein the bearing 13 is coaxially connected to the shaft center 11. Two end covers 14 are provided, and the two end covers 14 are respectively provided at the ends of the housing 10 along the axial direction to close the housing 10, and further, the end covers 14 are assembled to the housing 10 through the locking member 15.

[0034] The locking member 15 includes but is not limited to a locking nut.

[0035] As a preferred implementation, in order to ensure force balance, two groups of bearings 13 are provided, and are spaced apart along the axial direction of the shaft center 11 .

[0036] Furthermore, in order to prevent the bearing 13 from being seriously heated during operation, a receiving cavity is provided between the housing 10 and the shaft core 11 , and the receiving cavity is filled with a coolant.

[0037] Of course, in some other embodiments, the spindle assembly 1 further includes a liquid cooling device, which is disposed between the housing 10 and the shaft 11 so as to cool the bearing 13 in the housing 10 to avoid overheating.

[0038] A type also includes a gearbox, the input end of the gearbox is connected to the output end of the internal combustion engine 30, and the output end of the gearbox is connected to the spindle assembly 1. With this arrangement, the rotation speed of the spindle assembly 1 can be adjusted, and the rotation speed of the welding tool 2 can also be adjusted.

[0039] Of course, as a promotion and application of the present invention, the principle of the present invention can also be applied to other types of stir friction welding equipment, including but not limited to retractable stir friction welding spindles and backfilling stir friction welding spindles. Embodiment 2

[0040] The present invention also discloses a welding device, including a stir friction welding device as described in Example 1, wherein the welding device includes a movable arm, and the stir friction welding device is assembled on the movable arm so that it can move to a specified position under the drive of the movable arm to perform welding operations.

[0041] The movable arm includes but is not limited to the shutdown arm of the excavator, and has the characteristics of good rigidity and flexibility, so as to meet the welding requirements in the field environment.

[0042] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A friction stir welding device, characterized in that: include, A welding unit, comprising a spindle assembly and a welding tool, wherein the spindle assembly is connected to the welding tool, the spindle assembly is driven to rotate to drive the welding tool to move, and the welding tool is used to contact the workpiece to be welded; The driving unit comprises an internal combustion engine, wherein the output end of the internal combustion engine is drivingly connected to the main shaft assembly to drive the main shaft assembly to rotate.

2. A friction stir welding device according to claim 1, characterized in that: The drive unit further includes a fuel tank connected to the internal combustion engine to provide fuel to the internal combustion engine.

3. A friction stir welding device according to claim 1, characterized in that: The driving unit further comprises a transmission mechanism, an output shaft is provided at the output end of the internal combustion engine, and the output shaft is connected to the main shaft assembly through the transmission mechanism.

4. A friction stir welding device according to claim 3, characterized in that: The transmission mechanism includes a pulley assembly and a synchronous belt, the pulley assembly includes a first pulley and a second pulley, the first pulley is coaxially connected to the output shaft, the second pulley is coaxially connected to the main shaft assembly, and the synchronous belt is tensioned and connected to the first pulley and the second pulley to transmit power from the internal combustion engine to the main shaft assembly.

5. A friction stir welding device according to any one of claims 1 to 4, characterized in that: The spindle assembly includes a shell, an axis and a connecting piece. Part of the axis is accommodated in the shell, and the axis is coaxially connected to the shell. One end of the axis is connected to the drive unit, and the other end of the axis is connected to the connecting piece. The welding tool is installed on the connecting piece.

6. A friction stir welding device according to claim 5, characterized in that: The spindle assembly also includes a bearing, an end cover and a locking piece. The bearing is coaxially connected to the axis. The end cover is arranged at the end of the shell in the axial direction to close the shell. The end cover is assembled to the shell through the locking piece.

7. A friction stir welding device according to claim 5, characterized in that: A containing cavity is provided between the shell and the shaft core, and the containing cavity is filled with cooling liquid.

8. The friction stir welding device according to claim 5, characterized in that: The spindle assembly also includes a liquid cooling device, which is arranged between the shell and the axis.

9. The friction stir welding device according to claim 1, characterized in that: It also includes a gearbox, the input end of which is connected to the output end of the internal combustion engine, and the output end of which is connected to the main shaft assembly to adjust the rotation speed of the main shaft assembly.

10. A welding device, characterized in that: It comprises a friction stir welding device as described in any one of claims 1 to 9, wherein the welding equipment comprises a movable arm, and the friction stir welding device is assembled on the movable arm to move to a specified position under the drive of the movable arm.

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