CN111805074A

CN111805074A - Friction stir welding device and calibration method thereof

Info

Publication number: CN111805074A
Application number: CN202010685020.2A
Authority: CN
Inventors: 曹海平; 许磊; 高超文; 陆雄旺
Original assignee: Liuzhou Zhijia Metal Technology Co ltd
Current assignee: Liuzhou Zhijia Metal Technology Co ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2020-10-23
Anticipated expiration: 2040-07-16
Also published as: CN111805074B

Abstract

The invention discloses a friction stir welding device and a calibration method thereof, wherein the friction stir welding device comprises a base, a movable seat, a friction stir welding unit, a first driving unit, a second driving unit and a control unit; the movable seat is connected with the base in a sliding mode and comprises two installation parts arranged at intervals in the vertical direction and an avoidance space arranged between the two installation parts, the friction stir welding units correspond to the installation parts one to one, the friction stir welding units are connected with the installation parts in a sliding mode, the two friction stir welding units are matched to form a welding part, the first driving unit is used for driving the movable seat to reciprocate relative to the base, and the second driving unit is used for driving the two friction stir welding units to move, so that the opening size of the welding part is adjustable; the control unit is in communication with the friction stir welding unit, the first drive unit and the second drive unit such that the rotational directions of the two friction stir welding units are opposite. The friction stir welding device can perform double-sided symmetrical welding.

Description

Friction stir welding device and calibration method thereof

Technical Field

The invention relates to the technical field of welding, in particular to a friction stir welding device and a calibration method thereof.

Background

The friction stir welding device is a device which utilizes the heat generated by the rotation and mutual friction of a stirring head on the end surface of a workpiece to ensure that the end part reaches a thermoplastic state and then rapidly upset to finish welding. The common friction stir welding equipment mainly has the structures of vertical type, horizontal type, gantry type, cantilever type and the like, and a single stirring head is adopted to weld one surface of a workpiece.

When the traditional friction stir welding device is used for welding workpieces in a double-sided symmetrical mode, the workpieces need to be detached to turn over to weld a welding seam on the other side after one side is welded in the welding process, and therefore welding efficiency is low.

Disclosure of Invention

Therefore, it is necessary to provide a friction stir welding device and a calibration method thereof, which can perform double-sided symmetric welding and is beneficial to improving the welding efficiency.

The technical scheme is as follows:

on one hand, the application provides a friction stir welding device, which comprises a base, a movable seat, a friction stir welding unit, a first driving unit, a second driving unit and a control unit; the movable seat is connected with the base in a sliding mode and comprises two installation parts arranged at intervals in the vertical direction and an avoidance space arranged between the two installation parts, the friction stir welding units correspond to the installation parts one to one, the friction stir welding units are connected with the installation parts in a sliding mode, the two friction stir welding units are matched to form a welding part, the first driving unit is used for driving the movable seat to reciprocate relative to the base, and the second driving unit is used for driving the two friction stir welding units to move, so that the opening size of the welding part is adjustable; the control unit is in communication connection with the friction stir welding unit, the first driving unit and the second driving unit, so that the rotation directions of the two friction stir welding units are opposite, and the welding part can move along a preset track.

When the friction stir welding device is used, at least two workpieces to be welded are arranged between the two friction stir welding units, the control unit controls the second driving unit to act, so that the welding part can be used for welding the at least two workpieces acutely, and the friction stir welding units are used for welding the at least two workpieces by using the welding part. In the process, the control unit controls the first driving unit to drive the movable seat to move, and welding seams can be synchronously formed on the at least two workpieces according to a preset welding seam track, so that the at least two workpieces are welded into a whole. And because the existence of the avoidance space, the movable seat can not interfere the movement of the friction stir welding unit, and the required welding line can be conveniently obtained. Meanwhile, the rotation directions of the two friction stir welding units are opposite, so that the torsion of the stirring head to the workpiece can be mutually offset, the workpiece cannot be easily twisted in the welding process, and the requirements of the fixture on the workbench of the workpiece are favorably reduced.

It can be understood that when two friction stir welding units carry out double-sided symmetrical welding on at least two workpieces, the heat energy can be fully utilized, and the energy consumption is reduced. In the process, the workpiece does not need to be turned over and clamped, the first driving unit can complete welding at least once in a reciprocating motion, and the welding efficiency is improved. Meanwhile, by means of the matching of the movable seat and the base, during welding, axial force of the workpiece on the friction stir welding unit can be offset, so that the comprehensive external force of the friction stir welding borne by the workpiece can be reduced, the workpiece can be prevented from being extruded and deformed, and the requirement on the clamp is lowered.

Moreover, the two sides of the workpiece are synchronously welded at the same time, so that an additional bottom plate is not needed to prevent the welding seam from being subjected to upsetting deformation.

The technical solution is further explained below:

in one embodiment, the control unit is communicatively connected to the second drive unit such that the axial pressing forces on the workpieces by the two friction stir welding units are in opposite directions but of the same magnitude.

In one embodiment, the base is provided with a first slide rail, and the movable seat is provided with a first slide block connected with the first slide rail in a sliding manner.

In one embodiment, the first driving unit comprises a first servo motor in communication connection with the control unit, a first lead screw and a first nut in transmission fit with the first lead screw, the output end of the first servo motor is in transmission connection with the first lead screw, and the first nut is fixedly connected with the first sliding block or the movable base.

In one embodiment, the mounting portion is provided with a second slide rail, and the friction stir welding unit is provided with a second slide block connected with the second slide rail in a sliding manner.

In one embodiment, the second driving units correspond to the friction stir welding units one by one, each second driving unit comprises a second servo motor, a second screw rod and a second nut in transmission fit with the second screw rod, the output end of the second servo motor is in transmission connection with the second screw rod, and the second nut is fixedly connected with the corresponding second sliding block or the friction stir welding unit; the control unit is respectively in communication connection with the two second servo motors, so that the axial extrusion forces of the two friction stir welding units to the workpiece are opposite in direction and same in size.

In one embodiment, the friction stir welding unit further comprises a ram, a spindle motor and a stirring head, the ram is fixedly connected with the second slider, the spindle motor is mounted on the ram, the spindle motor drives the stirring head to rotate, and the spindle motor is in communication connection with the control unit.

On the other hand, the present application further provides a calibration method for the friction stir welding device in any of the above embodiments, which is characterized by comprising the following steps:

the second driving unit acts to make the opening of the welding part be at the maximum;

disassembling a stirring head of the friction stir welding unit, and arranging a calibration cutter on the friction stir welding unit;

the second driving unit acts again to enable the two calibration cutters to move oppositely until the distance between the two calibration cutters is a preset value d, and the position information of the friction stir welding unit at the moment is calibrated to be initial position information;

and setting the end position information according to the initial position information and the maximum allowable height information of the machinable workpiece.

Therefore, the calibration method is utilized to calibrate, so that the initial position information is fixed, the welding initial height is prevented from being randomly changed along with the different thicknesses of the workpieces, and the control program is facilitated to be simplified. After the initial position information calibration is completed, the control unit records the information as a calibration reference point, so that the influence of the length and the shape of the stirring head and the inclination angle of the friction stir welding unit relative to the mounting part can be avoided. Meanwhile, the preset value can be set according to different factory precision requirements. After the initial position information is determined, the end position information can be set according to the maximum allowable height information of the workpiece which can be processed by the device, and the control unit can record the end position information and write the end position information into a control program so that the two friction stir welding units synchronously move within a rated range.

When the device is used, the height of the workpiece to be welded on the worktable surface can be adjusted by utilizing the initial position information, so that the initial position of the friction stir welding unit is superposed with the central plane of the workpiece to be welded; then, two friction stir welding units are synchronously controlled to realize double-sided symmetrical welding to form the required welding line.

The technical solution is further explained below:

in one embodiment, 0mm < d < 1 mm.

In one embodiment, the calibration method of the friction stir welding device further comprises the following steps:

and obtaining the padding height information according to the initial position information and the thickness information of the workpiece to be processed, and adjusting the pressure bearing surface of the workpiece to be processed by using the padding height information.

Drawings

FIG. 1 is a schematic view of a friction stir welding apparatus according to an embodiment;

FIG. 2 is an exploded view of the friction stir welding apparatus shown in FIG. 1;

FIG. 3 is a schematic partial exploded view of the first driving unit and the base shown in FIG. 2;

FIG. 4 is a schematic diagram of a partial explosion of the second drive unit shown in FIG. 2;

FIG. 5 is a schematic partially exploded view of the friction stir welding unit shown in FIG. 2;

FIG. 6 is a schematic view of the friction stir welding apparatus shown in FIG. 1;

FIG. 7 is an enlarged, fragmentary view of the agitator head of FIG. 6 in operation;

fig. 8 is a schematic diagram illustrating a method for calculating the padding height information according to an embodiment.

Description of reference numerals:

100. a base; 110. a first slide rail; 200. a movable seat; 210. an installation part; 212. a second slide rail; 220. a first slider; 202. avoiding a space; 300. a friction stir welding unit; 310. a ram; 312. a second slider; 314. mounting grooves; 320. a spindle motor; 330. a stirring head; 340. a transmission unit; 350. a shielding cover; 302. welding the part; 400. a first drive unit; 410. a first servo motor; 420. a first lead screw; 430. a first nut; 440. a first mounting bracket; 450. a first coupling; 460. a first bearing housing; 500. a second driving unit; 510. a second servo motor; 520. a second lead screw; 530. a second nut; 540. a second mounting bracket; 550. a second coupling; 560. a second bearing housing; 600. a control unit; 700. a work table; 800. and (5) a workpiece.

Brief description of the drawingsthe accompanying drawings, which form a part of this application, are included to provide a further understanding of the invention, and are included to explain illustrative embodiments of the invention and the description thereof and are not to be considered limiting of the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 6, in an embodiment, a friction stir welding apparatus is provided, which includes a base 100, a movable base 200, a friction stir welding unit 300, a first driving unit 400, a second driving unit 500, and a control unit 600; the movable seat 200 is connected with the base 100 in a sliding manner, the movable seat 200 comprises two installation parts 210 arranged at intervals along the vertical direction and an avoidance space 202 arranged between the two installation parts 210, the friction stir welding units 300 correspond to the installation parts 210 one by one, the two friction stir welding units 300 are matched to form a welding part 302, and the first driving unit 400 is used for driving the movable seat 200 to reciprocate relative to the base 100; the second driving unit 500 is used for driving the two friction stir welding units 300 to move, so that the opening size of the welding part 302 is adjustable; the control unit 600 is in communication with the friction stir welding unit 300, the first driving unit 400 and the second driving unit 500, such that the rotation directions of the two friction stir welding units 300 are opposite, and the welding portion 302 can move along a predetermined trajectory.

As shown in fig. 6 and 7, when the friction stir welding apparatus is used, at least two workpieces 800 to be welded are placed between the two friction stir welding units 300, the control unit controls the second driving unit to operate so that the welded portion can be welded to the at least two workpieces acutely, and the friction stir welding unit 300 is started to weld the at least two workpieces 800 by the welded portion 302. In this process, the control unit controls the first driving unit 400 to drive the movable seat 200 to move, i.e. the welding seam can be synchronously welded on the at least two workpieces 800 according to the preset welding seam track, so that the at least two workpieces 800 are welded into a whole. And due to the existence of the avoidance space 202, the movable seat 200 does not interfere with the movement of the friction stir welding unit 300, so that a required welding seam can be obtained conveniently. Meanwhile, the rotation directions of the two friction stir welding units 300 are opposite, so that the torque force of the stirring head 330 on the workpiece 800 can be mutually offset, the workpiece 800 cannot be easily twisted in the welding process, and the requirement of the fixture on the workbench of the workpiece 800 can be favorably reduced.

It can be understood that when two friction stir welding units 300 perform double-sided symmetrical welding on at least two workpieces 800, the heat energy can be fully utilized, and the energy consumption is reduced. In the process, the workpiece 800 does not need to be turned over and clamped, and the first driving unit 400 can complete welding by at least reciprocating once, so that the welding efficiency is improved. Meanwhile, by matching the movable seat 200 with the base 100, during welding, the axial force of the workpiece 800 on the friction stir welding unit 300 can be offset, so that the comprehensive stirring welding external force borne by the workpiece 800 can be reduced, the workpiece 800 can be prevented from being extruded and deformed, and the requirement on a clamp can be reduced.

Furthermore, the two sides of the workpiece 800 are welded simultaneously, so that no additional bottom plate is needed to prevent the upset deformation of the weld. Meanwhile, the axial force of the workpiece 700 on the friction stir welding unit 300 during welding is transmitted to the inside of the movable seat 200 through force analysis, so that the abrasion on the first driving unit 400 can be reduced.

It should be noted that the "friction stir welding unit 300" may be implemented by any conventional technique.

The first driving unit 400 can be selected according to actual requirements, such as a reciprocating linear driving unit and a reciprocating swing driving unit.

This device utilizes second drive unit 500 can drive friction stir welding unit 300 and remove along vertical direction, realizes the welding to the work piece 800 of different thickness, can be according to the interval of waiting two friction stir welding units 300 of the thickness adjustment of welded work piece 800 for the size of weld part 302 is adjustable.

This second drive unit 500 can select according to actual need, for example pneumatic cylinder, linear electric motor etc. can provide the equipment that directly provides flexible power, also can utilize rack and pinion mechanism + servo motor, or lead screw nut mechanism + servo motor to realize the flexible power of interval's provision.

It should be noted that the communication control means between the "control unit 600" and each of the actuators (such as the friction stir welding unit 300, the first driving unit 400, and the second driving unit 500) belongs to the prior art, and is not described herein again.

The control unit 600 may be a programmable controller, a motion control card, a computer, or other control devices.

On the basis of the above-described embodiment, in an embodiment, the control unit 600 is in communication with the second driving unit 300 such that the axial pressing forces of the two friction stir welding units 300 on the workpiece are opposite in direction but the same in magnitude. It can be understood that, when the two sides of the workpiece 800 to be welded are subjected to the downward pressing force of the upper friction stir welding unit 300 and the upward pressing force of the lower friction stir welding unit 300, the two pressing forces can be offset, which is beneficial to reducing the deformation of the workpiece 800 and improving the welding quality.

On the basis of any of the above embodiments, as shown in fig. 1 and fig. 2, in an embodiment, the base 100 is provided with a first slide rail 110, and the movable seat 200 is provided with a first sliding block 220 slidably connected with the first slide rail 110. Thus, the sliding connection between the movable seat 200 and the base 100 is realized by the cooperation of the first sliding block 220 and the first sliding rail 110, which is beneficial to ensuring the stability and the movement precision control of the reciprocating movement of the movable seat 200. Specifically, the first driving unit 400 provides power, so that the movable base 200 can precisely move through the cooperation of the first slider 220 and the first sliding rail 110. In the actual manufacturing process, the first sliding block 220 and the first sliding rail 110 with different accuracies can be selected according to different requirements.

On the basis of the above embodiments, as shown in fig. 1 to fig. 3, in an embodiment, the first driving unit 400 includes a first servo motor 410 connected to the control unit 600 in communication, a first lead screw 420, and a first nut 430 engaged with the first lead screw 420 in a transmission manner, an output end of the first servo motor 410 is connected to the first lead screw 420 in a transmission manner, and the first nut 430 is fixedly connected to the first sliding block 220 or the movable base 200. Thus, the control unit 600 is only needed to control the forward and reverse rotation of the first servo motor 410 to drive the first lead screw 420 to rotate, and further control the first nut 430 to drive the first slider 220 to reciprocate along the axial direction of the first lead screw 420, so as to realize the reciprocating movement of the movable base 200; meanwhile, the movable seat 200 can be stopped when the movable seat is moved by utilizing the characteristic of a screw nut transmission structure. Specifically, the first servo motor 410 rotates forward, so that the first nut 430 drives the first slider 220 to move, and drives the movable seat 200 to move to a welding start point, and after the position of the friction stir welding unit 300 is adjusted, the friction stir welding unit 300 acts to perform friction stir welding; at this time, the first servo motor 410 rotates reversely according to the preset rotation speed, so that the movable seat 200 moves back, a weld joint is gradually formed on the at least two workpieces 800 until the movable seat 200 moves to the final welding point, and then the preset weld joint is formed on the at least two workpieces 800, so that the at least two workpieces 800 are welded into a whole.

On the basis of the above embodiments, as shown in fig. 2 and fig. 3, in an embodiment, the first driving unit 400 further includes a first mounting bracket 440, a first coupler 450, and a first bearing seat 460, the first mounting bracket 440 is fixedly disposed on the base 100, the first servo motor 410 is fixedly disposed on the first mounting bracket 440, the first servo motor 410 is connected to one end of the first lead screw 420 through the first coupler 450, the other end of the first lead screw 420 is rotatably connected to the first bearing seat 460, and the first bearing seat 460 is fixedly disposed on the base 100. In this way, the first mounting bracket 440 is used to mount the first servo motor 410 on the base 100, which facilitates the mounting of the first servo motor 410; meanwhile, the first screw rod 420 is rotatably mounted on the base 100 by the cooperation of the first bearing shaft, the first coupler 450 and the first servo motor 410, so that the first screw rod 420 is reliably mounted.

In addition to the above embodiments, as shown in fig. 2, 4 and 5, in one embodiment, the mounting portion 210 is provided with a second slide rail 212, and the friction stir welding unit 300 is provided with a second slide block 312 slidably connected to the second slide rail 212. In this way, the sliding connection between the friction stir welding unit 300 and the mounting part 210 is realized by the cooperation of the second sliding block 312 and the second sliding rail 212, which is beneficial to ensuring the stability and the movement precision control of the reciprocating movement of the friction stir welding unit 300; meanwhile, the deviation caused by the reaction force of the workpiece 800 in the working process of the friction stir welding unit 300 can be avoided, and the welding quality can be ensured. Specifically, the second driving unit 500 provides power so that the friction stir welding unit 300 can precisely move by the cooperation of the second slider 312 and the second slide rail 212. In the actual manufacturing process, the second sliding block 312 and the second sliding rail 212 with different accuracies can be selected according to different requirements.

On the basis of the above embodiments, as shown in fig. 2 and fig. 4, in an embodiment, the second driving unit 500 includes a second servo motor 510, a second lead screw 520, and a second nut 530 in transmission fit with the second lead screw 520, an output end of the second servo motor 510 is in transmission connection with the second lead screw 520, and the second nut 530 is fixedly connected with the second slider 312 or the friction stir welding unit 300; the control unit is respectively in communication connection with the two second servo motors, so that the axial extrusion forces of the two friction stir welding units to the workpiece are opposite in direction and same in size. Thus, the control unit 600 is used to control the forward and reverse rotation of the second servo motor 510 to drive the second lead screw 520 to rotate, and further control the second nut 530 to drive the second slider 312 to reciprocate along the axial direction of the second lead screw 520, so as to realize the reciprocating movement of the friction stir welding unit 300; meanwhile, the friction stir welding unit 300 can stop immediately after walking by utilizing the characteristic of a screw nut transmission structure, can bear the axial reaction force given by the workpiece 800, and is favorable for ensuring the welding quality. Specifically, the second servo motor 510 rotates forward, so that the second nut 530 drives the second slider 312 to move and drives the friction stir welding unit 300 to move to the start welding point, and the friction stir welding unit 300 acts to perform friction stir welding; after the welding is completed, the second servo motor 510 rotates reversely according to the preset rotating speed, so that the friction stir welding unit 300 moves back, and the workpiece 800 is convenient to take out.

It can be understood that, when the two sides of the workpiece 700 to be welded are subjected to the downward pressing force of the upper friction stir welding unit 300 and simultaneously subjected to the upward pressing force of the lower friction stir welding unit 300, the two pressing forces can be offset with each other, which is beneficial to reducing the deformation of the workpiece 700 and improving the welding quality.

Based on the above embodiments, as shown in fig. 4, in an embodiment, the second driving unit 500 further includes a second mounting bracket 540, a second coupling 550 and a second bearing seat 560, the second mounting bracket 540 is fixed on the mounting portion 210, the second servo motor 510 is connected to one end of the second lead screw 520 through the second coupling 550, the other end of the second lead screw 520 is rotatably connected to the second bearing seat 560, and the second bearing seat 560 is fixed on the mounting portion 210. In this way, second servomotor 510 is mounted on mounting portion 210 by second mounting bracket 540, which facilitates mounting of second servomotor 510; meanwhile, the second lead screw 520 is rotatably mounted on the mounting portion 210 by the cooperation of the second bearing shaft with the second coupling 550 and the second servo motor 510, so that the second lead screw 520 is reliably mounted.

On the basis of any of the above-mentioned embodiments of the second slide rail 212, as shown in fig. 2 and fig. 5, in an embodiment, the friction stir welding unit 300 further includes a ram 310, a spindle motor 320 and a stirring head 330, the ram 310 is fixedly connected to the second slider 312, the spindle motor 320 is installed on the ram 310, the spindle motor 320 drives the stirring head 330 to rotate, and the spindle motor is in communication connection with the control unit. So, with spindle motor 320 and stirring head 330 integrated to the slide rail on, be convenient for carry out the modularization equipment, improve the packaging efficiency. Meanwhile, later maintenance and replacement are convenient.

In addition, as shown in fig. 6 and 7, when the apparatus is used, the rotation directions of the spindle motors 320 of the two friction stir welding units 300 are opposite, so that the torque forces of the stirring head 330 to the workpiece 800 can be mutually offset, so that the workpiece 800 cannot be easily twisted during the welding process, which is beneficial to reducing the fixture requirements on the worktable of the workpiece 800.

On the basis of the above embodiments, as shown in fig. 5, in an embodiment, the ram 310 is provided with a mounting groove 314, the friction stir welding unit 300 further includes a transmission unit 340 and a shielding cover 350, the transmission unit 340 is installed in the ram 310, the spindle motor 320 drives the stirring head 330 to rotate through the transmission unit 340, and the shielding cover 350 is matched with the mounting groove 314 to form a protection cavity. Therefore, the installation groove 314 and the shielding cover 350 form a protection cavity for protecting the transmission unit 340, so that the operation reliability of the transmission unit 340 is improved, and the influence of high temperature or liquid splashing in the welding process on the transmission unit 340 is favorably reduced.

The transmission unit 340 can be implemented by any transmission structure of the existing friction stir welding which meets the use requirements.

Specifically, in the present embodiment, the transmission unit 340 and the spindle motor 320 may also be connected by a coupling.

In one embodiment, a method for calibrating a friction stir welding device in any one of the above embodiments is provided, which is characterized by comprising the following steps:

When the device is used, the height of the workpiece to be welded on the working table surface can be adjusted by utilizing the initial position information (the height can be adjusted by adopting any one of the existing height adjusting means), so that the initial position of the friction stir welding unit is coincided with the central plane of the workpiece to be welded; then, two friction stir welding units are synchronously controlled to realize double-sided symmetrical welding to form the required welding line.

Further, in one embodiment, 0mm < d < 1 mm. So, can utilize the feeler gauge to carry out the interval size between two calibration cutting tools and judge, make things convenient for the operator to carry out the calibration debugging.

On the basis of any one of the embodiments, in one implementation, the calibration method of the friction stir welding device further includes the following steps:

Therefore, the height of the pressure bearing surface of the workpiece to be machined can be adjusted by utilizing the cushion block, so that the initial position of the friction stir welding unit is coincided with the central plane of the workpiece to be welded. Of course, the height of the workbench is adjustable, and the height of the workbench can be adjusted by utilizing the padding height information, so that the initial position of the friction stir welding unit is coincided with the central plane of the workpiece to be welded.

As shown in fig. 8, the pad height information t ═ H)/2, where H is the maximum thickness of the processable workpiece and H is the thickness of the workpiece to be processed.

It should be noted that, equivalently, "some" or "some" may be a part corresponding to "a member", that is, "some" or "some" may be manufactured integrally with "another part of the member"; the "part" can be made separately from the "other part" and then combined with the "other part" into a whole. The expressions "a certain body" and "a certain part" in the present application are only one example, and are not intended to limit the scope of the present application for reading convenience, and the technical solutions equivalent to the present application should be understood as being included in the above features and having the same functions.

It should be noted that, equivalently, the components included in the "unit", "assembly", "mechanism" and "device" of the present application can also be flexibly combined, i.e., can be produced in a modularized manner according to actual needs, so as to facilitate the modularized assembly. The division of the above-mentioned components in the present application is only one example, which is convenient for reading and is not a limitation to the protection scope of the present application, and the same functions as the above-mentioned components should be understood as equivalent technical solutions in the present application.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered as "fixed transmission connection" with another element, the two elements may be fixed in a detachable connection manner or in an undetachable connection manner, and power transmission can be achieved, such as sleeving, clamping, integrally-formed fixing, welding and the like, which can be achieved in the prior art, and is not cumbersome. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A friction stir welding apparatus comprising:

a base;

the movable seat is connected with the base in a sliding way and comprises two installation parts which are arranged at intervals along the vertical direction and an avoidance space which is arranged between the two installation parts,

the friction stir welding units are in one-to-one correspondence with the mounting parts and are in sliding connection with the mounting parts, and the two friction stir welding units are matched to form a welding part;

the first driving unit is used for driving the movable seat to move relative to the base;

the second driving unit is used for driving the two friction stir welding units to move, so that the size of the opening of the welding part is adjustable; and

and the control unit is in communication connection with the friction stir welding unit, the first driving unit and the second driving unit, so that the rotation directions of the two friction stir welding units are opposite, and the welding part can move along a preset track.

2. The friction stir welding apparatus of claim 1 wherein said control unit is communicatively connected to said second drive unit such that the axial pressing forces on the workpieces by the two friction stir welding units are in opposite directions but of equal magnitude.

3. The friction stir welding apparatus of claim 1 wherein the base has a first rail, and the movable mount has a first slider slidably coupled to the first rail.

4. The friction stir welding device of claim 3 wherein the first driving unit comprises a first servo motor in communication connection with the control unit, a first lead screw, and a first nut in driving fit with the first lead screw, an output end of the first servo motor is in driving connection with the first lead screw, and the first nut is fixedly connected with the first slider or the movable base.

5. The friction stir welding apparatus of any one of claims 1 to 4 wherein the mounting portion is provided with a second slide rail and the friction stir welding unit is provided with a second slider slidably connected to the second slide rail.

6. The friction stir welding device according to claim 5, wherein the second driving unit corresponds to the friction stir welding unit one by one, the second driving unit comprises a second servo motor, a second lead screw and a second nut in transmission fit with the second lead screw, the output end of the second servo motor is in transmission connection with the second lead screw, and the second nut is fixedly connected with the corresponding second slider or the friction stir welding unit; the control unit is respectively in communication connection with the two second servo motors, so that the axial extrusion forces of the two friction stir welding units to the workpiece are opposite in direction and same in size.

7. The friction stir welding apparatus of claim 5 wherein the friction stir welding unit further comprises a ram, a spindle motor, and a stir head, the ram is fixedly connected to the second slider, the spindle motor is mounted on the ram, the spindle motor rotates the stir head, and the spindle motor is in communication with the control unit.

8. A method of calibrating a friction stir welding apparatus as defined in any of claims 1 to 7 comprising the steps of:

the second driving unit is actuated so that the opening of the welded part is at a maximum;

the second driving unit acts again to enable the two calibration cutters to move oppositely until the distance between the two calibration cutters is a preset value d, and the control unit calibrates the position information of the friction stir welding unit at the moment as initial position information;

9. The method of calibrating a friction stir welding apparatus of claim 8 wherein 0mm < d < 1 mm.

10. The method of calibrating a friction stir welding apparatus according to claim 8 or 9, further comprising the steps of: