Friction stir welding mechanism capable of synchronously polishing flash

Abstract

The invention discloses a friction stir welding mechanism capable of synchronously polishing flashes. The friction stir welding mechanism comprises a base, a workbench, a welding mechanism and a floating polishing mechanism, wherein the workbench, the welding mechanism and the floating polishing mechanism are installed on the base. The welding mechanism and the floating polishing mechanism are both located above the workbench. The workbench can move horizontally; the welding mechanism comprises a stirring driving motor mounted on the base, a main shaft in transmission connection with the stirring driving motor and a stirring head mounted at the bottom of the main shaft; the floating grinding mechanism comprises a mechanical arm installed on the base, a floating connecting piece installed at the output end of the mechanical arm and a grinding assembly installed on the floating connecting piece. The grinding assembly is located on one side of the stirring head. The floating polishing mechanism and the welding mechanism are both integrated on the same equipment, manual polishing is not needed after welding is completed, additional equipment is not needed for removing flashes of welded workpieces, and therefore production procedures are reduced, the working efficiency is improved, and the machining cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of welding mechanisms, in particular to a friction stir welding mechanism capable of synchronously grinding flash. Background Art

[0002] The basic principle of friction stir welding is: a high-speed rotating stirring head is inserted into the workpiece to be welded and moves along the welding direction. The friction heat generated by the stirring head and the contact part causes the workpiece to be partially plasticized. The plasticized material forms a dense solid phase weld under the action of stirring and extrusion.

[0003] Among them, for the friction stir machine, application publication number CN103480963A discloses a friction stir welding machine, which specifically discloses a spindle head chassis driven by a hydraulic cylinder, a proportional valve arranged side by side with the hydraulic cylinder, a spindle head is supported on the spindle head chassis, the lower end of the spindle head extends out of the bottom surface of the spindle head chassis, and a base is provided below the spindle head, a servo motor, a hydraulic pump and an oil tank are provided on the base, the servo motor is connected to the hydraulic pump, the P end of the proportional valve is connected to the oil tank after being connected in series with the hydraulic pump through an oil inlet pipeline, the T end of the proportional valve is connected to the oil tank through an oil return pipeline, and the A end of the proportional valve is connected in series with the second hydraulic lock through a pipeline, and connected to the hydraulic cylinder The rodless cavity is connected, and the B end of the proportional valve is connected to the rod cavity of the hydraulic cylinder after being connected in series with the third hydraulic lock through a pipeline; a cooling plate is fixedly arranged under the spindle head chassis, and the cooling plate is a circular hollow cavity body, and surrounds the periphery of the spindle head, and a plurality of spray holes are arranged on the upper disk surface of the cooling plate, and the spray holes are communicated with the cavity inside the cooling plate, and a joint is also installed on the cooling plate, and the joint extends into the cooling plate, and the center hole of the joint is communicated with the cavity inside the cooling plate: an accumulator is arranged between the hydraulic pump and the P end of the electromagnetic reversing valve, and the accumulator is connected to the oil inlet pipeline through a bypass pipe, and a balancing valve is connected in series on the oil return pipeline between the T end of the proportional valve and the oil tank.

[0004] However, there is still room for improvement for the above-mentioned friction stir welding machine. For example, during the friction stir welding process, a certain amount of metal residue, i.e., flash, often appears along the edge of the welding surface. This is a common welding defect and needs to be removed after welding. However, the traditional way to remove flash is to remove it manually. Specifically, after the friction stir welding is completed, the workpiece is taken out, and the operator uses a grinder to manually polish and repair the welding surface and remove the excess flash. This method increases the labor cost and the polishing effect of each product will have uncertain factors. Another way is to directly use a machine instead of manual polishing. For example, after the friction stir welding machine is used for friction stir welding, another device is needed to remove the flash. In the step of removing the flash by machine, it is necessary to retain a certain processing allowance before the raw material is welded, and then the workpiece is placed on the milling machine after welding to use the overall removal method to mill off the excess allowance and welding flash. This method increases the equipment cost and material cost, and has high requirements for the processing technology.

[0005] In summary, no matter which of the above methods is used to remove the flash, additional production processes are required, thereby reducing work efficiency and increasing processing costs. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a stir friction welding mechanism that can synchronously grind flash, which integrates a floating grinding mechanism and a welding mechanism on the same device, and the grinding component of the floating grinding mechanism can adjust its position in time according to the forward direction of the stirring head; this design not only does not require manual grinding after welding is completed, but also does not require the setting of additional equipment to remove flash from the welded workpiece, which undoubtedly reduces the production process, increases work efficiency and reduces processing costs.

[0007] In order to achieve the above object, the technical solution of the present invention is:

[0008] A friction stir welding mechanism capable of synchronously grinding flash comprises a base, a workbench, a welding mechanism and a floating grinding mechanism respectively mounted on the base; the welding mechanism and the floating grinding mechanism are both located above the workbench; the workbench can move horizontally in all directions; the welding mechanism comprises a stirring drive motor mounted on the base, a spindle for transmission connection with the stirring drive motor and a stirring head mounted at the bottom of the spindle; the floating grinding mechanism comprises a mechanical arm mounted on the base, a floating connection piece mounted on the output end of the mechanical arm and a grinding assembly mounted on the floating connection piece; the grinding assembly is located on one side of the stirring head; during the friction stir welding of the workpiece on the workbench by the stirring head, the forward direction of the stirring head relative to the workbench can be changed through the movement of the workbench, and the control center can continuously transmit the forward direction and angle parameters of the stirring head to the mechanical arm, so that the mechanical arm can drive the grinding assembly to rotate accordingly through the floating connection piece according to the data and keep it behind the stirring head when it is moving forward, so as to continuously grind the flash.

[0009] Furthermore, the mechanical arm is a four-axis mechanical arm; the mechanical arm includes a mounting base fixed on the base, a first arm horizontally rotatably connected to the mounting base, a second arm horizontally rotatably connected to the first arm, a third arm vertically movably connected to the second arm, and a fourth arm rotatably connected to the third arm; the floating connecting piece is connected to the fourth arm. The above arrangement can conveniently drive the grinding assembly to achieve multi-angle position adjustment, ensuring that the grinding assembly can be moved to the rear of the mixing head in a timely manner.

[0010] Furthermore, the four arms of the robotic arm all use motors as power sources.

[0011] Furthermore, the grinding assembly includes a grinding motor mounted on the floating connector through a bracket and a grinding sheet connected to an output shaft of the grinding motor. The above arrangement enables the grinding motor to drive the grinding sheet to grind the flash of the workpiece to remove the flash.

[0012] Furthermore, it also includes an X-axis moving assembly and a Y-axis moving assembly; the workbench is installed on the X-axis moving assembly, and the X-axis moving assembly is installed on the Y-axis moving assembly. The above arrangement can drive the workbench to achieve multi-directional and multi-angle horizontal movement.

[0013] Furthermore, the welding mechanism further comprises a machine head; the machine head is fixed on the base, and the stirring drive motor is fixed on the machine head. The above arrangement can facilitate the positioning of the stirring drive motor.

[0014] Furthermore, the base includes a bottom plate and a gantry mounted on the bottom plate; the workbench is located on the bottom plate; the welding mechanism and the floating grinding mechanism are both located on the gantry. The above arrangement can facilitate positioning the machine head and the mounting seat above the workbench.

[0015] Further, when the stirring head moves forward in one direction of the X-axis relative to the workbench, the robotic arm drives the grinding assembly to move accordingly to the X-axis; when the stirring head moves forward in one direction of the Y-axis relative to the workbench, the robotic arm drives the grinding assembly to move accordingly to the Y-axis; when the stirring head moves forward at an angle position between the X-axis and the Y-axis relative to the workbench, the robotic arm drives the grinding assembly to move accordingly to an angle position between the X-axis and the Y-axis.

[0016] The beneficial effects of the present invention are:

[0017] (1) In the present invention, since the grinding assembly can be adjusted at multiple angles by the robot arm, when the stirring head of the welding mechanism is performing stir friction welding in the front, the robot arm can timely adjust the position of the grinding assembly according to the forward direction of the stirring head relative to the workbench, so that the grinding assembly can remain behind the stirring head. In this way, the burrs generated during the stir friction welding of the stirring head can be promptly polished and removed by the grinding assembly at the rear, thereby achieving the effect of removing excess burrs. Moreover, this design makes it unnecessary to retain a certain processing allowance for the workpiece before welding.

[0018] (2) The floating grinding mechanism and welding mechanism of the present invention are both installed on the base, that is, the floating grinding mechanism and the welding mechanism are integrated into the same device, and the grinding assembly of the floating grinding mechanism can be adjusted in time according to the forward direction of the stirring head, thereby ensuring the use effect. This design not only does not require manual grinding after welding, but also does not require the installation of additional equipment to remove the flash of the welded workpiece, which undoubtedly reduces the production process, increases work efficiency and reduces processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the friction plate of the present invention when it is arranged along the X-axis and located on one side of the stirring head;

[0020] Figure 2 is a schematic diagram of the friction plate of the present invention being arranged along the X-axis and located on the other side of the stirring head;

[0021] Figure 3 It is a schematic diagram of the friction plate of the present invention when it is arranged along the Y axis and located on one side of the stirring head;

[0022] Figure 4It is a schematic diagram of the friction plate of the present invention being arranged along the Y axis and located on the other side of the stirring head.

[0023] Reference numerals

[0024] 1. Base; 11. Bottom plate; 12. Gantry;

[0025] 2. Workbench;

[0026] 3. Welding mechanism; 31. Spindle; 32. Stirring head; 33. Machine head;

[0027] 4. Floating grinding mechanism; 41. Mechanical arm; 411. Mounting seat; 412. First arm; 413. Second arm; 414. Third arm; 415. Fourth arm; 42. Floating connector; 43. Bracket; 44. Grinding motor; 45. Grinding disc. DETAILED DESCRIPTION

[0028] The invention is further described below in conjunction with the accompanying drawings and specific embodiments. The following description is only exemplary and does not limit the protection scope of the invention.

[0029] like Figure 1-Figure 4 As shown, a friction stir welding mechanism capable of synchronously grinding flash includes a base 1 and a workbench 2, a welding mechanism 3 and a floating grinding mechanism 4 respectively mounted on the base 1; the welding mechanism 3 and the floating grinding mechanism 4 are both located above the workbench 2.

[0030] The workbench 2 can be moved horizontally in all directions, that is, the workbench 2 can be moved in multiple directions and at multiple angles.

[0031] like Figure 1-Figure 4 As shown, the welding mechanism 3 includes a stirring drive motor (not shown due to visual occlusion) mounted on the base 1, a main shaft 31 for transmission connection with the stirring drive motor, and a stirring head 32 mounted at the bottom of the main shaft 31. Therefore, the stirring drive motor drives the stirring head 32 to achieve a stir friction welding effect. In addition, the transmission assembly between the stirring drive motor and the main shaft 31 can adopt an existing structure.

[0032] like Figure 1-Figure 4 As shown, the floating grinding mechanism 4 includes a mechanical arm 41 installed on the base 1 , a floating connector 42 installed on the output end of the mechanical arm 41 , and a grinding assembly installed on the floating connector 42 ; the grinding assembly is located on one side of the stirring head 32 .

[0033] like Figure 1-Figure 4As shown, for the grinding assembly, when the stirring head 32 moves forward in one direction of the X axis relative to the workbench 2, the robot arm 41 will drive the grinding assembly to move to the X axis accordingly; when the stirring head 32 moves forward in one direction of the Y axis relative to the workbench 2, the robot arm 41 will drive the grinding assembly to move to the Y axis accordingly; when the stirring head 32 moves forward at an angle between the X axis and the Y axis relative to the workbench 2, the robot arm 41 will drive the grinding assembly to move to an angle between the X axis and the Y axis accordingly. Of course, after the grinding assembly moves into place, the grinding assembly is kept behind the stirring head 32.

[0034] In addition, when in use, during the friction stir welding process of the stirring head 32 on the workpiece (not shown in the figure) on the workbench 2, the position of the welding mechanism 3 remains unchanged, that is, the position of the stirring head 32 remains unchanged. Through the movement of the workbench 2, the forward direction of the stirring head 32 relative to the workbench 2 can be changed, and the control center can continuously transmit the forward direction and angle parameters of the stirring head 32 to the robot arm 41, so that the robot arm 41 can drive the grinding assembly to rotate accordingly through the floating connection 42 according to the data and keep it behind the stirring head 32 when it is moving forward, so as to continuously grind the burrs and ultimately achieve the purpose of removing the burrs.

[0035] like Figure 1-Figure 4 As shown, in this embodiment, the robot arm 41 is a four-axis robot arm 41; the robot arm 41 includes a mounting base 411 fixed on the base 1, a first arm 412 horizontally rotatably connected to the mounting base 411, a second arm 413 horizontally rotatably connected to the first arm 412, a third arm 414 vertically movably connected to the second arm 413, and a fourth arm 415 rotatably connected to the third arm 414; the grinding assembly is connected to the fourth arm 415 through a floating connector 42. Therefore, through the above-mentioned setting of the robot arm 41, the robot arm 41 can use the various rotations of the first arm 412, the second arm 413, the third arm 414 and the fourth arm 415 to achieve multi-angle position adjustment, so as to drive the grinding assembly to achieve multi-angle position adjustment, and ensure that the grinding assembly can be moved to the rear of the stirring head 32 in time.

[0036] Specifically, the four arms of the mechanical arm 41 all use motors (not shown) as power sources. As for the mechanical arm 41, it can adopt a ready-made structure on the market, which will not be described in detail here.

[0037] like Figure 1-Figure 4As shown, specifically, the grinding assembly includes a grinding motor 44 mounted on a floating connection 42 through a bracket 43 and a grinding sheet 45 connected to the output shaft of the grinding motor 44. Therefore, the grinding motor 44 drives the grinding sheet 45 to grind the flash of the workpiece to remove the flash. In addition, the setting of the floating connection 42 can make the floating grinding mechanism 4 have a certain flexibility when working, and can avoid the floating grinding mechanism 4 from causing damage to the grinding sheet 45 when working. For the floating connection 42, it can adopt existing products on the market, and it will not be described in detail here.

[0038] The present invention also includes an X-axis moving assembly (not shown in the figure) and a Y-axis moving assembly (not shown in the figure); the workbench 2 is mounted on the X-axis moving assembly, and the X-axis moving assembly is mounted on the Y-axis moving assembly. Therefore, the above arrangement enables the workbench 2 to achieve multi-directional movement in the horizontal direction. For the X-axis moving assembly and the Y-axis moving assembly, they can use a motor to drive a synchronous wheel and a belt to achieve corresponding movements.

[0039] like Figure 1-Figure 4 As shown, in this embodiment, the welding mechanism 3 further includes a machine head 33; the machine head 33 is fixed on the base 1, and the stirring drive motor is fixed on the machine head 33. Therefore, after the machine head 33 is set on the base 1, the stirring drive motor and the stirring head 32 can be easily installed.

[0040] like Figure 1-Figure 4 As shown, specifically, the base 1 includes a bottom plate 11 and a gantry 12 mounted on the bottom plate 11; the workbench 2 is located on the bottom plate 11; the welding mechanism 3 and the floating grinding mechanism 4 are both located on the gantry 12. More specifically, the machine head 33 and the mounting seat 411 are respectively mounted on the gantry 12. Therefore, by dividing the base 1 into the bottom plate 11 and the gantry 12, the machine head 33 and the mounting seat 411 can be conveniently positioned above the workbench 2.

[0041] In summary, the present invention, because the grinding assembly can be adjusted by the multi-angle of the mechanical arm 41, when the stirring head 32 of the welding mechanism 3 is performing stir friction welding in the front, the mechanical arm 41 can timely follow the forward direction of the stirring head 32 to adjust the position of the grinding assembly according to the forward direction of the stirring head 32 relative to the workbench 2, so that the grinding assembly can remain behind the stirring head 32, so that the flash generated during the stir friction welding of the stirring head 32 can be timely polished and removed by the rear grinding assembly, so as to achieve the effect of removing excess flash. In addition, since the floating grinding mechanism 4 and the welding mechanism 3 of the present invention are both installed on the base 1, that is, the floating grinding mechanism 4 and the welding mechanism 3 are integrated on the same device, and the grinding assembly of the floating grinding mechanism 4 can be adjusted in time according to the forward direction of the stirring head 32, thereby ensuring the use effect. This design not only does not require manual grinding after welding, but also does not require the setting of additional equipment to remove flash from the welded workpiece, which undoubtedly reduces the production process, but also increases work efficiency and reduces processing costs.

[0042] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A friction stir welding mechanism capable of synchronously grinding flash, characterized in that: It comprises a base, and a workbench, a welding mechanism and a floating grinding mechanism respectively installed on the base; the welding mechanism and the floating grinding mechanism are both located above the workbench; The workbench can move horizontally in all directions; The welding mechanism comprises a stirring drive motor installed on the base, a main shaft for driving connection with the stirring drive motor, and a stirring head installed at the bottom of the main shaft; The floating grinding mechanism comprises a mechanical arm mounted on the base, a floating connection piece mounted on the output end of the mechanical arm, and a grinding assembly mounted on the floating connection piece; the grinding assembly is located on one side of the mixing head; During the friction stir welding process of the workpiece on the workbench by the stirring head, the forward direction of the stirring head relative to the workbench can be changed through the movement of the workbench, and the control center can continuously transmit the forward direction and angle parameters of the stirring head to the robotic arm, so that the robotic arm can drive the grinding assembly to rotate accordingly through the floating connection according to the data and keep it behind the stirring head when it is moving forward, so as to continuously grind the flash.

2. The friction stir welding mechanism capable of synchronously grinding flash according to claim 1, characterized in that: The robotic arm is a four-axis robotic arm; the robotic arm includes a mounting base fixed on the base, a first arm horizontally rotatably connected to the mounting base, a second arm horizontally rotatably connected to the first arm, a third arm vertically movably connected to the second arm, and a fourth arm rotatably connected to the third arm; the floating connecting piece is connected to the fourth arm.

3. The friction stir welding mechanism capable of synchronously grinding flash according to claim 2, characterized in that: The four arms of the mechanical arm all use motors as power sources.

4. The friction stir welding mechanism capable of synchronously grinding flash according to claim 1, characterized in that: The grinding assembly includes a grinding motor installed on the floating connection member through a bracket and a grinding sheet connected to the output shaft of the grinding motor.

5. The friction stir welding mechanism capable of synchronously grinding flash according to claim 1, characterized in that: It also includes an X-axis moving component and a Y-axis moving component; the workbench is installed on the X-axis moving component, and the X-axis moving component is installed on the Y-axis moving component.

6. The friction stir welding mechanism capable of synchronously grinding flash according to claim 1, characterized in that: The welding mechanism also includes a machine head; the machine head is fixed on the base, and the stirring drive motor is fixed on the machine head.

7. The friction stir welding mechanism capable of synchronously grinding flash according to claim 1, characterized in that: The base comprises a bottom plate and a gantry mounted on the bottom plate; the workbench is located on the bottom plate; the welding mechanism and the floating grinding mechanism are both located on the gantry.

8. The friction stir welding mechanism capable of synchronously grinding flash according to claim 1, characterized in that: When the stirring head moves forward in one direction of the X-axis relative to the workbench, the mechanical arm drives the grinding assembly to move to the X-axis accordingly; When the stirring head moves forward in one direction of the Y axis relative to the workbench, the robotic arm drives the grinding assembly to move to the Y axis accordingly; When the stirring head moves forward relative to the workbench at an angle between the X-axis and the Y-axis, the robot arm drives the grinding assembly to move to the angle between the X-axis and the Y-axis accordingly.

Images