CN216264017U

CN216264017U - A friction stir welding device for cylinder part axial seam

Info

Publication number: CN216264017U
Application number: CN202121827157.3U
Authority: CN
Inventors: 李正琴; 何秀权
Original assignee: Wuhan Shangtian Industrial Technology Co ltd
Current assignee: Wuhan Shangtian Industrial Technology Co ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-04-12
Anticipated expiration: 2031-08-05

Abstract

The utility model relates to a friction stir welding device for axial joints of cylindrical parts, which comprises a lower support, an upper support, a sliding workbench and a welding mechanism, wherein the lower support is fixedly connected with the upper support; the lower bracket is of a hollow frame structure and is provided with a front cross beam provided with a supporting cushion block; the upper bracket is fixedly arranged at the upper end of the lower bracket; the sliding workbench comprises a workbench supporting piece and a welding workbench, the workbench supporting piece is fixedly arranged on the lower support, the welding workbench is slidably arranged on the workbench supporting piece, the welding workbench is provided with a welding station and a feeding and discharging station on the sliding stroke of the welding workbench, and the supporting cushion block is positioned at the corresponding position of the welding station; when the welding workbench is positioned at a welding station, one end of the welding workbench is supported by the workbench supporting piece, and the other end of the welding workbench is supported by the supporting cushion block, so that a simply supported beam structure supported by two ends is formed.

Description

A friction stir welding device for cylinder part axial seam

Technical Field

The utility model relates to the technical field of friction stir welding equipment, in particular to a friction stir welding device for axial joints of cylindrical parts.

Background

Friction stir welding is characterized in that the heat generated by friction between a welding tool rotating at a high speed and a workpiece is utilized to enable the welded material to be locally plastically softened, when the welding tool moves forwards along a welding interface, the plasticized material flows from the front part to the rear part of the welding tool under the action of the rotating friction force of the welding tool, and a compact solid-phase welding seam is formed under the extrusion of the welding tool.

At present, a cylindrical annular part penetrates through a welding support beam of a cantilever to weld a joint of the parts by moving a stirring head (also called a stirring welding head), as shown in fig. 1, which is a structural schematic diagram of a stirring friction welding device in the prior art, a base X1 is used as a support main body of the device, a cantilever X3 is transversely connected to a stand X2, a cylindrical part X4 to be welded is hung on the cantilever X3, a welding seam is located at the upper end of the cantilever X3, and the stirring head X5 performs stirring friction welding on the welding seam above the cantilever X3.

Above-mentioned structure has very big upset power to the weldment at welding process agitator head, present equipment is owing to adopted cantilever bearing structure, along with the agitator head moves forward, cantilever bearing structure can produce great amount of deflection at the distal end, along with welding length's change, this amount of deflection can grow gradually, until unsatisfied welding condition, cause the welding failure, can know from the actual production condition, generally if welding seam length is greater than 300mm, the weldment qualification rate can be low to below 60%, this can not satisfy the product production yield requirement far away, cause the appearance of a large amount of wastrel, lead to manufacturing cost greatly increased, and then bring great economic loss for the enterprise.

SUMMERY OF THE UTILITY MODEL

Based on the above description, the present invention provides a friction stir welding device for axial joints of cylindrical parts, so as to solve the problems in the prior art.

The technical scheme for solving the technical problems is as follows:

a friction stir welding device for axial joints of cylindrical parts is characterized by comprising a lower support, an upper support, a sliding workbench and a welding mechanism;

the lower support is of a hollow frame structure and is provided with a front cross beam provided with a supporting cushion block;

the upper bracket is fixedly arranged at the upper end of the lower bracket;

the sliding workbench comprises a workbench supporting piece and at least one welding workbench, the workbench supporting piece is fixedly arranged on the lower support, the welding workbench is slidably arranged on the workbench supporting piece along the direction vertical to the front cross beam, the welding workbench is provided with a welding station and a feeding and discharging station on the sliding stroke, the supporting cushion blocks are positioned at the corresponding positions of the welding station, and when the welding workbench is positioned at the welding station, the supporting cushion blocks support one end of the welding workbench, which is far away from the workbench supporting piece; when the welding workbench is positioned at the feeding and discharging station, the welding workbench is separated from the supporting cushion block;

and the welding mechanism is arranged on the upper support and positioned above the welding station and used for welding a workpiece on a welding workbench of the welding station.

Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

the application provides a friction stir welding device is when using, weldment work platform can be at the weldment work station with go up unloading station direct motion, when weldment work platform is in the weldment work station, weldment work platform's one end is supported by workstation support piece, the other end is supported by the supporting pad piece, and then the simple beam structure that has formed both ends and supported, two fulcrums of simple beam support form simple structure, do not have unnecessary motion positioner, its stable in structure is reliable, can effectively reduce the work arm amount of deflection, solve the not high problem of cantilever structure weldment work platform welding qualification rate.

Furthermore, the number of the welding work tables is two, the two welding work tables are arranged on the work table supporting piece in parallel, the distance between the two welding work tables is the distance between the welding work stations and the feeding and discharging work stations, and the two welding work tables are connected through a connecting beam.

Furthermore, the welding stations are located in the middle of the workbench supporting piece, the number of the feeding and discharging stations is two, and the two feeding stations are located at two ends of the workbench supporting piece respectively.

Furthermore, the sliding workbench further comprises a side guide rail, an upper guide rail and a sliding driving mechanism, the welding workbench is provided with a lateral sliding block and a forward sliding block which are matched with the side guide rail and the upper guide rail respectively, and the welding workbench is provided with an upper pressing block and a lateral pressing block which are used for pressing the workpiece.

The welding seam opposite-top clamping mechanism comprises at least one plane pressing claw pair, and each plane pressing claw pair comprises two plane pressing claws which are symmetrically arranged on two sides of the welding joint moving through hole respectively and used for oppositely clamping a welding seam on the workpiece.

Furthermore, the plane pressure claw comprises a support piece, a driving installation piece, a connecting rod assembly, a plane pressing plate and a telescopic driving piece, the support piece is provided with a near end close to the welding head moving through hole and a far end far away from the near end, the upper end of the support piece is connected with the lower end face of the support plate, an installation gap is formed in the middle of the support piece, the telescopic driving piece, the connecting rod assembly and the plane pressing plate are sequentially arranged in the installation gap along the direction from the far end to the near end, an inclined downward guide groove is formed in the direction from the far end to the near end of the support piece, the driving installation piece is installed at the far end of the support piece and comprises a fixing sleeve and a telescopic rod, the upper end of the driving installation piece is connected with the support plate, the lower end of the driving installation piece is hinged to the fixing sleeve, and the connecting rod assembly comprises a first connecting rod, a connecting rod and a second connecting rod, The telescopic rod, the first connecting rod, the second connecting rod and the plane pressing plate are sequentially hinged, the pin shaft is installed at the hinged position of the first connecting rod and the second connecting rod, and the pin shaft is movably installed in the guide groove.

Furthermore, the connecting rod assembly further comprises a third connecting rod, the lower end of the third connecting rod is hinged to the hinged position of the telescopic rod and the first connecting rod, the upper end of the third connecting rod is hinged to a pressing plate installation piece, and the pressing plate installation piece is fixedly connected to the lower end of the supporting flat plate.

Furthermore, the telescopic driving piece is a hydraulic cylinder, the fixed sleeve is a cylinder body of the hydraulic cylinder, and the telescopic rod is a piston rod of the hydraulic cylinder.

Furthermore, the upper support further comprises a welding installation seat, the welding mechanism comprises a stirring welding head, a translation driving assembly, a lifting driving assembly and a rotation driving assembly, the welding installation seat is installed at the upper end of the supporting flat plate, the stirring welding head moves along the welding head moving through hole under the driving of the translation driving assembly, the lifting driving assembly is installed on the welding installation seat and used for driving the stirring welding head to lift, and the rotation driving assembly is installed on the welding installation seat and used for driving the stirring welding head to rotate.

Furthermore, the translation driving assembly and the lifting driving assembly drive the stirring welding head to move in a screw nut mode.

Drawings

FIG. 1 is a schematic diagram of a friction stir welding apparatus according to the prior art;

FIG. 2 is a schematic overall structure diagram of a friction stir welding device for axial seams of cylindrical parts according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a hidden part of the panel shown in FIG. 2;

FIG. 4 is a schematic view of the lower structure of FIG. 1;

FIG. 5 is a schematic view of the sliding table of FIG. 1;

FIG. 6 is a schematic structural view of the welding bench of FIG. 5;

FIG. 7 is a schematic view of the upper structure of FIG. 1;

FIG. 8 is a schematic structural view of the flat pressing claw in FIG. 7;

fig. 9 is a schematic view of fig. 7 from another perspective.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a lower bracket; 2. a sliding table; 3. an upper bracket; 4. a welding seam opposite-top clamping mechanism; 5. A welding mechanism; 6. a workpiece; 11. a rectangular frame; 12. a lower cross member; 13. an upper cross member; 14. a front cross member; 15. supporting the cushion block; 21. a table support; 22. a side rail; 23. an upper guide rail; 24. A driving oil cylinder; 25. a welding workbench; 26. supporting the connecting box; 27. an indicator laser; 28. a connecting beam; A. a welding station; B. a loading and unloading station; 251. a table body; 252. a forward slider; 253. a lateral slider; 254. an upper compaction block; 255. a lateral compaction block; 31. supporting the flat plate; 32. Welding the mounting seat; 31a, a welding head moving through hole; 41. pressing claws on a plane; 411. a support plate; 412. a drive mount; 413. a connecting rod assembly; 414. a plane pressing plate; 415. a hydraulic cylinder; 416. a platen mount; 41a, a proximal end; 41b, distal end; 41c, a guide groove; 4131. a first link; 4132. a second link; 4133. a pin shaft; 4134. a third link; 4151. a cylinder body; 4152. a piston rod; 50. stirring the welding head; 51. a translation drive assembly; 52. a lift drive assembly; 53. a rotary drive assembly; 511. A Y-axis moving sliding table; 512. a Y-axis slider; 513. a Y-axis drive motor; 514. a Y-axis driving screw rod; 515. a Y-axis feed screw nut; 516. a Y-axis guide rail; 521. a Z-axis drive motor; 531. a spindle motor; 532. and (4) a synchronous belt.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that spatial relationship terms, such as "under", "below", "beneath", "below", "over", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

As shown in fig. 1 and 2, the embodiment of the present application provides a friction stir welding device for axial joints of cylindrical parts, which includes a lower support 1, a sliding table 2, an upper support 3, a weld butt clamping mechanism 4 and a welding mechanism 5, and is mainly used for welding a cylindrical workpiece 6 containing an axial weld.

As shown in fig. 3, the lower bracket 1 is a hollow frame structure with panels at two ends, and mainly functions to support the whole welding device, and meanwhile, a pivot of the simple beam structure in the application is located on the lower bracket 1, specifically, the lower bracket comprises two rectangular frames 11 arranged at intervals, the lower part of each rectangular frame 11 is provided with a lower cross beam 12 arranged at equal height, the upper part of each rectangular frame is provided with an upper cross beam 13 arranged at equal height, the upper cross beam 12 and the lower cross beam 13 are connected through vertical plates, two vertical plates arranged at the front side are provided with front cross beams 14, the front cross beams are fixedly provided with supporting cushion blocks 15, and the supporting cushion blocks 15 are exactly one pivot of the simple beam structure in the application.

The upper bracket 3 is fixedly mounted to the upper end of the lower bracket 1, i.e., the upper bracket 3 is mounted on the upper cross member 13.

As shown in fig. 4, the slide table 2 includes a table support 21, a side rail 22, an upper rail 23, a driving mechanism, a welding table 25, a support connection box 26, an indication laser 27, and a connection beam 28.

The workbench support 21 is fixedly mounted on the lower support 1, and specifically, the workbench support 21 is respectively placed on the lower beams 12 at two sides and is fixedly connected with the lower beams 12.

The welding workbench 25 is slidably mounted on the workbench support 21 in a direction perpendicular to the front cross beam 14, specifically, the upper guide rail 23 is mounted above the workbench support 21 along the length direction thereof, the side guide rail 22 is mounted on the side surface thereof along the length direction thereof, as shown in fig. 5, the welding workbench 25 comprises a workbench body 251, a forward slide block 252 which is matched with the upper guide rail 23 to slide and a side slide block 253 which is matched with the side guide rail 22 to slide are mounted on one side of the workbench body 251, and the smooth sliding of the working arm 25 is realized through the matching of the two slide blocks and the guide rails.

Wherein the driving mechanism is a driving oil cylinder 24, an oil cylinder mounting groove is formed on the side surface of the worktable supporting member 21, the driving oil cylinder 24 is integrally mounted in the oil cylinder mounting groove, and an oil cylinder piston shaft thereof is connected with the working arm 25.

In the embodiment of the present application, the welding table 25 has a welding station a and a feeding and discharging station B on the sliding stroke thereof, and on the welding station a, the welding table 25 is used for performing welding work, and on the feeding and discharging station, the welding table 25 is used for performing feeding and discharging work.

In order to ensure the smooth operation of the welding operation, the welding worktable 25 is formed into a simple beam structure during welding, so that the supporting cushion block 15 is located at a corresponding position of the welding station a, and when the welding worktable 25 is located at the welding station a, the supporting cushion block 15 supports one end of the welding worktable 25 far away from the worktable support member 21; when the welding table 15 is located at the loading and unloading station B, the welding table 25 is separated from the support cushion block 15.

The welding mechanism 5 is mounted on the upper frame 3 above the welding station a, and is used for welding the workpiece 6 on the welding table 25 at the welding station a.

In the preferred embodiment of the present application, the number of the welding stations 25 is two, two welding stations 25 are installed on the station support 21 in parallel, the distance between the two welding stations 25 is the distance between the welding station a and the feeding and discharging station B, and the two welding stations 25 are connected by the connecting beam 28.

More preferably, the welding station a is located in the middle of the workbench support 21, the number of the feeding and discharging stations B is two, the two feeding and discharging stations B are respectively located at two ends of the workbench support 21, so that when one welding workbench 25 is located on the welding station a, the other welding workbench 25 is located at the position of any feeding and discharging station, as shown in the figure, the welding workbench 25 on the left side is located at the welding station a, the welding workbench 25 on the right side is located at the feeding station B on the right side, when the driving oil cylinder 24 acts, the welding workbench 25 on the left side is moved to the position of the feeding station B, the workbench on the right side is located at the welding station a, the feeding and discharging of the workpiece 6 and the welding process can be carried out simultaneously, and the work efficiency of the welding device is greatly improved.

In order to ensure the pressing of the workpiece 6 on the welding table 25, in the preferred embodiment of the present application, an upper pressing block 254 for pressing the workpiece 5 upward and a lateral pressing block 255 for pressing the workpiece 6 laterally are mounted on the welding table 25.

Wherein, two ends of the worktable support part 21 are provided with two symmetrical supporting connecting boxes 26, the supporting connecting boxes 26 are used as connecting parts of the sliding worktable 2 and the upper frame 3 and are also used as connecting boxes for the electrical control of the sliding worktable 2, meanwhile, an indicating laser 27 for installing and positioning workpieces is arranged on the supporting connecting boxes 26, the indicating laser 27 can indicate a laser line on the welding worktable 25 of the B tool at the loading and unloading station for indicating the welding seam position when the workpieces 6 are installed, and the accuracy and reliability of the welding seam position when the workpieces are installed are ensured.

As shown in fig. 6, the upper support 3 includes a supporting plate 31, the welding mechanism 5 is installed at the upper end of the supporting plate 31, the seam opposite-top clamping mechanism 4 is installed at the lower end of the supporting plate 31, a welding head moving through hole 31a is formed in the supporting plate 31 corresponding to the welding station a, the welding moving through hole 31a is a long strip-shaped hole, the length direction of the welding moving through hole is parallel to the length direction of the working arm 25, the seam opposite-top clamping mechanism 4 includes at least one pair of plane pressing claws, and each pair of plane pressing claws includes two plane pressing claws 41 symmetrically installed at two sides of the welding head moving through hole 31a respectively, and is used for opposite-top clamping the seam on the workpiece 6.

Specifically, as shown in fig. 7, the plane pressing claw 41 includes a support member having a proximal end 41a disposed near the welding head moving through hole 31a and a distal end 41b distant from the proximal end 41a, a link assembly 413, a plane pressing plate 414, and a telescopic driving member, the support member has a proximal end 41a disposed near the welding head moving through hole 31a and a distal end 41b distant from the proximal end 41a, the upper end of the support member is connected to the lower end surface of the support plate 31, and the middle portion of the support member has a mounting gap, in this application, the support member is two support plates 411 disposed at an opposite interval, the mounting gap is located between the two support plates 411, the telescopic driving member 415, the link assembly 413, and the plane pressing plate 143 are sequentially disposed in the mounting gap in a direction from the distal end 41b to the proximal end 41a, the proximal end 41a of the support member has a guide groove 41c inclined downward in a direction from the distal end 41b to the proximal end 41a, the driving mounting member 412 is mounted to the distal end of the support member, the telescopic driving member includes a fixing sleeve and a telescopic rod, the upper end of the driving installation part 412 is connected with the supporting plate 31, the lower end of the driving installation part 412 is hinged with the fixed sleeve, the connecting rod assembly 413 comprises a first connecting rod 4131, a second connecting rod 4132 and a pin 4133, the telescopic rod, the first connecting rod 4131, the second connecting rod 4132 and the plane pressing plate 414 are sequentially hinged, the pin 4133 is installed at the hinged position of the first connecting rod 4131 and the second connecting rod 4132, and the pin 4133 is movably installed in the guide groove 41 c.

In the preferred embodiment of the present application, the link assembly 413 further includes a third link 4134, a lower end of the third link 4134 is hinged to a hinge of the telescopic rod and the first link 4131, an upper end of the third link 4134 is hinged to a platen mounting member 416, and the platen mounting member 416 is fixedly connected to a lower end of the support plate 31.

In this embodiment, the telescopic driving member is a hydraulic cylinder 415, the fixed sleeve is a cylinder body 4151 of the hydraulic cylinder, and the telescopic rod is a piston rod 4152 of the hydraulic cylinder.

When the plane pressing claw 41 works, a piston rod 4152 in the hydraulic cylinder extends outwards under the action of hydraulic oil, the piston rod 4152 pushes the hinge of the first connecting rod 4131 and the second connecting rod 4132 to move, so that a pin 4133 of the hinge at the end part of the second connecting rod 4132 is driven to move in the guide groove 41d, the movement acts on the second connecting rod 4132, the second connecting rod 4132 also moves along the slotting direction of the guide groove 41c, and the plane pressing plate 414 moves downwards in a slanting way because the slotting direction of the guide groove 41c is downwards in a slanting way, when a workpiece 6 is arranged below the plane pressing plate 414, a downwards slanting acting force is generated on the workpiece 6, the acting force can be decomposed into a tangential force and a normal force on the plane of the workpiece to be welded, the tangential force faces to the front of the plane pressing claw 41, and the normal force faces to the workpiece 6; when 2 plane pressing claws of one plane pressing claw pair are installed according to the mode of a butt-joint clamping mechanism of a welding seam in the device, downward pressing force and butt-joint force which enables two sides of the welding seam to be pressed tightly are generated on planes on two sides of the welding seam of a workpiece 6, and clamping of the welded workpiece 6 during welding and tight joint of the welding seam in the welding process are realized.

As shown in fig. 8, the upper bracket 3 further includes a welding mount 32, the welding mechanism 5 includes a stir welding head 50, a translation driving assembly 51, a lifting driving assembly 52 and a rotation driving assembly 53, the welding mount 32 is mounted at the upper end of the support plate 31, the stir welding head 50 moves along the welding head moving through hole 31a under the driving of the translation driving assembly 51, the lifting driving assembly 55 is mounted on the welding mount 32 and used for driving the stir welding head 50 to lift, and the rotation driving assembly 53 is mounted on the welding mount 32 and used for driving the stir welding head 50 to rotate.

Preferably, the translation driving assembly 51 and the lifting driving assembly 52 both drive the stir welding head 50 to move by means of a screw nut.

In the embodiment of the present application, for convenience of description, the length direction of the table support 21 is referred to as the X-axis direction, the length direction of the welding head moving through hole 31a is referred to as the Y-axis direction, and the vertical lifting direction is referred to as the Z-axis direction, so that the translation driving assembly 51 is actually a Y-axis driving assembly, and in a preferred embodiment of the present application, the Y-axis driving assembly includes a Y-axis moving sliding table 511, a Y-axis sliding block 512, a Y-axis driving motor 513, a Y-axis driving screw 514, a Y-axis screw nut 515, and a Y-axis guide rail 516; the Y-axis guide rail 516 is mounted on the welding mounting base 32 and arranged along the Y-axis direction, the Y-axis moving sliding table 511 is slidably mounted on the Y-axis guide rail 516 through the Y-axis sliding block 512, the Y-axis driving screw 514 and the Y-axis screw nut 515 jointly form a screw nut pair structure, the Y-axis moving sliding table 511 can move back and forth along the Y-axis guide rail 516 under the action of the Y-axis driving motor 513 and the screw nut pair, and the Y-axis direction translation of the stirring welding head 50 mounted on the Y-axis moving sliding table 511 is achieved.

Similarly, the lifting driving assembly 52 is also called a Z-axis driving assembly, and the Z-axis driving assembly drives the stir welding head 50 to lift in the Z-axis direction through the Z-axis driving motor 521 and the corresponding screw-nut pair.

The rotation driving assembly 53 includes a spindle motor 531 and a synchronous belt 532, the spindle motor 531 is vertically installed on the Y-axis moving sliding table 511, and an output shaft thereof is drivingly connected to a welding machine spindle of the stir welding head 50 through the synchronous belt 532, so as to drive the stir welding head 50 to rotate to realize stir welding.

Compared with the prior art, the embodiment of the utility model at least has the following advantages:

1. the simple beam supporting structure is adopted, when the welding workbench 25 is positioned at the welding station A, one end of the welding workbench 25 is supported by the workbench supporting piece 21, the other end of the welding workbench is supported by the supporting cushion block 15, and then a simple beam structure supported by two ends is formed.

2. The double-station design is adopted, when one welding workbench 25 is positioned on the welding station A, the other welding workbench 25 is positioned on any feeding and discharging station, feeding and discharging of the workpiece 6 and the welding process can be carried out simultaneously, and the working efficiency of the welding device is greatly improved.

3. An indication laser 27 is adopted to indicate a laser line on the welding workbench 25 at the feeding and discharging station B for indicating the welding seam position when the workpiece 6 is installed, and the accuracy and reliability of the welding seam position when the workpiece is installed are ensured.

4. The welding seam opposite-top clamping mechanism 4 is adopted to generate downward pressing force on planes on two sides of a welding seam of the workpiece 6 and opposite-top force for enabling two sides of the welding seam to be close to each other and extruded, so that clamping of the welded workpiece 6 during welding and close fitting of the welding seam in the welding process are realized, and fixing of the welding seam position is facilitated.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A friction stir welding device for axial joints of cylindrical parts is characterized by comprising a lower support, an upper support, a sliding workbench and a welding mechanism;

the upper bracket is fixedly arranged at the upper end of the lower bracket;

2. The friction stir welding apparatus of claim 1 wherein said number of welding stations is two, two of said welding stations are mounted side-by-side on said station support, the spacing between said two welding stations is the spacing between said welding station and said loading and unloading station, and said two welding stations are connected by a connecting beam.

3. The friction stir welding apparatus of claim 2 wherein said welding stations are located at the middle of said table support, said two loading and unloading stations are located at the two ends of said table support, respectively.

4. The friction stir welding apparatus for axial joints of cylindrical parts according to claim 1, wherein the sliding table further comprises a side guide rail, an upper guide rail and a sliding driving mechanism, the welding table is provided with a lateral slider and a forward slider which are respectively matched with the side guide rail and the upper guide rail to slide, and the working arm is provided with an upper pressing block for pressing the workpiece upwards and a lateral pressing block for pressing the workpiece laterally.

5. The friction stir welding device of claim 1, further comprising a butt-clamping mechanism for the weld seam, wherein the upper support comprises a support plate, the welding mechanism is mounted on an upper end of the support plate, the butt-clamping mechanism is mounted on a lower end of the support plate, a weld joint moving through hole is formed in the support plate corresponding to the welding station, the butt-clamping mechanism comprises at least one pair of plane pressing claws, and each pair of plane pressing claws comprises two plane pressing claws symmetrically mounted on two sides of the weld joint moving through hole, respectively, for butt-clamping the weld seam on the workpiece.

6. The friction stir welding apparatus for axial joints of cylindrical members as claimed in claim 5, wherein said flat pressing claw comprises a support member having a proximal end disposed close to said welding head moving through hole and a distal end remote from said proximal end, an upper end of said support member being connected to a lower end surface of said support plate and having a mounting gap at a middle portion thereof, a driving member, a link assembly, and a flat pressing plate being sequentially disposed in said mounting gap in a direction from the distal end toward the proximal end, a proximal end of said support member having a guide groove formed in a direction from the distal end toward the proximal end, said driving member being mounted to the distal end of said support member, said driving member comprising a fixing sleeve and a telescopic rod, an upper end of said driving member being connected to said support plate, the lower end of the driving installation part is hinged to the fixed sleeve, the connecting rod assembly comprises a first connecting rod, a second connecting rod and a pin shaft, the telescopic rod, the first connecting rod, the second connecting rod and the plane pressing plate are sequentially hinged to each other, the pin shaft is installed at the hinged position of the first connecting rod and the second connecting rod, and the pin shaft is movably installed in the guide groove.

7. The friction stir welding apparatus of claim 6 wherein said linkage assembly further comprises a third linkage, a lower end of said third linkage being hingedly connected to a hinge of said telescoping rod and said first linkage, an upper end of said third linkage being hingedly attached to a platen mount, said platen mount being fixedly attached to a lower end of said support plate.

8. The friction stir welding apparatus of claim 7 wherein said telescoping drive member is a hydraulic cylinder, said stationary sleeve is a cylinder body of the hydraulic cylinder, and said telescoping rod is a piston rod of the hydraulic cylinder.

9. The friction stir welding apparatus for axial seams of cylindrical parts according to claim 5, wherein the upper support further comprises a welding mount, the welding mechanism comprises a friction stir welding head, a translational driving assembly, a lifting driving assembly and a rotational driving assembly, the welding mount is mounted on the upper end of the support plate, the friction stir welding head moves along the welding head moving through hole under the driving of the translational driving assembly, the lifting driving assembly is mounted on the welding mount for driving the friction stir welding head to lift, and the rotational driving assembly is mounted on the welding mount for driving the friction stir welding head to rotate.

10. The friction stir welding apparatus for axial joints of cylindrical parts according to claim 9, wherein said translational drive assembly and said elevation drive assembly each drive said stir weld head in motion by means of a lead screw nut.