Friction stir welding tool

Abstract

A friction stir welding tool relates to the technical field of friction stir welding and comprises a static shaft shoulder, a stirring needle, a stirring needle head, a rolling bearing, a bearing fixing sleeve, a connecting sleeve and a plane bearing. According to the friction stir welding tool, the spiral upward chip removal groove is formed in the stirring needle in the axial direction, the multiple chip removal holes are formed in the part, corresponding to the chip removal groove, of the static shaft shoulder, and therefore under the action of the spiral upward chip removal groove, welding flashes can be guided to move upwards and discharged in time through the chip removal holes; the phenomenon that welding flashes are concentrated in the chip removal holes in the bottom end of the static shaft shoulder to be discharged is avoided, the chip removal path is dispersed, chip removal sufficiency is ensured, blockage of the welding flashes is avoided, and the welding quality is improved. Besides, through the bearing arranged in the radial direction, deflection deformation of the stirring needle in the welding process can be avoided, direct sliding friction between the stirring needle rotating at a high speed and an external static shaft shoulder is effectively avoided, and frictional wear of the stirring needle is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stirring welding, in particular to a stirring friction welding tool. Background Art

[0002] Static shoulder friction stir welding evolved from friction stir welding. In addition to an internal rotating stirring needle, this technology also has an external static shoulder (i.e. static shoulder). The static shoulder remains stationary during the welding process, providing additional upsetting force to the weld and improving the welding quality. At the same time, the static shoulder can absorb excess heat on the weld surface, reduce the temperature gradient along the thickness direction of the plate, and further increase the quality of the weld. However, due to the limitation of its principle, the static shoulder and the stirring needle must maintain relative rotation, which requires a matching gap between the stirring needle and the static shoulder so that relative rotation can occur between the two. However, during the welding process, the plasticized material will flow upward along this gap and enter between the static shoulder and the stirring needle, causing wear of the stirring needle and the static shoulder, greatly reducing the life of the stirring needle.

[0003] In order to discharge the plasticized material that has entered the gap, the prior art is to open a number of through holes at the bottom of the stationary shoulder to facilitate the discharge of the plasticized material that has entered between the stationary shoulder and the stirring needle. However, if the chips are only discharged through the through holes at the bottom of the stationary shoulder, there is still insufficient chip discharge, or even blockage, which affects the welding quality.

[0004] In addition, during the friction stir welding process, the end of the stirring needle inserted into the workpiece is affected by the forward resistance, causing the stirring needle to bend and deform, which in turn causes the front end of the stirring needle to directly contact the inner wall of the static shoulder and generate sliding friction, greatly increasing the thermal-mechanical load on the stirring needle and greatly reducing the life of the stirring needle.

[0005] Based on this, a new type of stir friction welding tool is urgently needed to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a friction stir welding tool to ensure that the welding flash can be fully discharged, and can effectively avoid the bending deformation of the stirring needle during the welding process, and the direct friction heat generation between the high-speed rotating stirring needle and the inner wall of the static shaft shoulder.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A friction stir welding tool comprises a static shoulder, a stirring needle, a stirring needle head, a rolling bearing, a bearing fixing sleeve, a connecting sleeve and a plane bearing; a stirring needle head is arranged at the lower end of the stirring needle; a connecting part and a limiting part are arranged on the static shoulder; an internal thread is arranged in the inner cavity of the connecting sleeve; the stirring needle is inserted into the inner cavity of the static shoulder; the static shoulder is inserted into the connecting sleeve, a threaded pressure block is used to cooperate with the internal thread, the connecting part is tightened and pressed down, the limiting part and the lower flange of the connecting sleeve are pressed together, and then the static shoulder and the connecting sleeve are fixed together; more than two rolling bearings are arranged at the middle position of the stirring needle, the rolling bearings are positioned by the bearing fixing sleeve, a plane bearing is arranged at the upper end of the bearing fixing sleeve, the upper surface of the plane bearing is limited by the limiting boss, and the lower end of the bearing fixing sleeve is limited by the boss on the static shoulder; the upper end of the stirring needle is positioned by the connecting platform and fixedly connected to the driving fixture, and the connecting sleeve is fixedly installed on the surrounding equipment; the stirring needle can rotate in the inner cavity of the static shoulder through the rolling bearing.

[0009] In the above-mentioned friction stir welding tool, the stirring needle is also provided with an auxiliary shaft shoulder and a tapered section; a spiral upward chip removal groove is axially opened above the tapered section, and a plurality of chip removal holes are opened on the static shaft shoulder corresponding to the chip removal groove.

[0010] The above-mentioned friction stir welding tool has a chip removal ring groove connected to the upper end of the spiral upward chip removal groove.

[0011] In the above-mentioned friction stir welding tool, the chip removal holes include a plurality of slotted holes opened axially along the static shaft shoulder and circular horizontal through holes located above and below the plurality of slotted holes, and the plurality of circular horizontal through holes are evenly distributed along the circumference of the static shaft shoulder.

[0012] In the above-mentioned friction stir welding tool, a circular horizontal through hole is also provided between the plurality of slot-shaped holes on the static shaft shoulder.

[0013] In the above-mentioned friction stir welding tool, a plurality of inclined through holes are provided on the static shoulder at a position corresponding to the auxiliary shoulder of the stirring needle, and the inclined through holes are evenly distributed along the circumference.

[0014] In the above-mentioned friction stir welding tool, the stirring needle is provided with a conical thread, and the conical thread is provided with a milling surface, and three milling surfaces are provided and evenly distributed along the circumference.

[0015] The utility model has the following advantages:

[0016] Compared with the prior art, the friction stir welding tool of the utility model has a spiral upward chip removal groove on the stirring needle along the axial direction, and a plurality of chip removal holes are opened on the static shaft shoulder corresponding to the chip removal groove, so that the welding flash can be guided to move upward under the action of the spiral upward chip removal groove, and discharged in time through the chip removal holes, avoiding the welding flash being concentrated in the chip removal holes at the bottom of the static shaft shoulder, dispersing the chip removal path, ensuring the adequacy of chip removal, avoiding the blockage of welding flash, and improving the welding quality. In addition, the utility model can avoid the bending deformation of the stirring needle during welding through the radially arranged bearing, effectively avoid the direct sliding friction between the high-speed rotating stirring needle and the external static shaft shoulder, reduce the friction wear of the stirring needle, and increase its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the front view of the utility model;

[0018] Figure 2 It is the AA section view;

[0019] Figure 3 This is a three-dimensional structural diagram of the utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of a stirring needle;

[0021] Figure 5 It is the three-dimensional structure diagram of the static shoulder;

[0022] Figure 6 This is a partial enlarged view of the stirring needle;

[0023] The numbers in the figure are respectively represented as: 1. static shoulder, 2. stirring needle, 3. auxiliary shoulder, 4. stirring needle head, 5. tapered section, 6. chip groove, 7. chip hole, 8. chip ring groove, 9. rolling bearing, 10. bearing fixing sleeve, 11. limiting boss, 12. inclined through hole, 13. connecting part, 14. limiting part, 15. connecting sleeve, 16. plane bearing, 17. internal thread, 18. connecting platform, 19. milling surface. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] The utility model provides a friction stir welding tool, such as Figure 1 and Figure 2As shown, it includes a static shoulder 1 with an accommodating cavity, and a stirring needle 2 that is inserted into the accommodating cavity and forms a clearance fit with the static shoulder 1. The top of the static shoulder 1 is provided with a connecting portion 13 and a limiting portion 14. The connecting sleeve 15 is provided with an internal thread, and a threaded pressing block is used to cooperate with the internal thread 17, and the connecting portion 13 is tightened and pressed down, so that the limiting portion 14 and the lower flange of the connecting sleeve 15 are pressed together, and then the static shoulder 1 and the connecting sleeve 15 are fixed together. The connecting sleeve 15 is fixedly connected to the stir friction welding equipment through a card groove provided on its outside.

[0026] The utility model discloses a friction stir welding welding tool, wherein a plurality of rolling bearings 9 are arranged between the stirring needle 2 and the static shaft shoulder 1, and the plurality of rolling bearings 9 are respectively limited at the upper and lower ends by a sleeve 10 located between the stirring needle 2 and the static shaft shoulder 1. The bottom end of the sleeve 10 is limited by a limit table provided on the static shaft shoulder 1, and the top end of the sleeve 10 is limited by a limit block 11 provided on the stirring needle 2, and a plane bearing 16 is arranged between the sleeve 10 and the limit block 11 to reduce the plane friction between the sleeve 10 and the stirring needle 2. The welding tool forms rolling friction between the stirring needle 2 and the static shaft shoulder 1 during the welding process by arranging the rolling bearings 9 and the plane bearings 16, thereby reducing the heat generated by the friction, and the rolling bearings 9 provide radial support for the stirring needle, thereby preventing the stirring needle 2 from being flexed and deformed during the welding process, thereby contacting the inner wall of the static shaft shoulder 1 and generating sliding friction.

[0027] The utility model discloses a friction stir welding welding tool, wherein a spiral upward chip removal groove 6 is provided on the stirring needle 2 in the axial direction, and a chip removal ring groove 8 is provided at the upper end of the spiral upward chip removal groove 6. A plurality of chip removal holes 7 are provided on the static shoulder 1 corresponding to the chip removal groove 6. The chip removal holes 7 include a plurality of slot-shaped holes provided in the axial direction of the static shoulder 1 and circular horizontal through holes provided above and below the plurality of slot-shaped holes, and the plurality of circular horizontal through holes are evenly arranged along the circumference of the static shoulder 1. A circular horizontal through hole is also provided between the plurality of slot-shaped holes. A plurality of inclined through holes 12 are provided on the static shoulder 1 corresponding to the auxiliary shoulder 3 of the stirring needle 2, and the plurality of inclined through holes 12 are evenly arranged along the circumference of the auxiliary static shoulder 1. The welding tool is provided with a spiral upward chip removal groove 6 and a plurality of corresponding chip removal holes 7, so that the welding flash can be guided to rise and be discharged through the plurality of chip removal holes 7, thereby assisting in improving the chip removal capacity of the plurality of inclined through holes 12 and avoiding the occurrence of the blocking phenomenon of the inclined through holes 12 caused by the welding flash.

[0028] In the friction stir welding tool of the utility model, a stirring needle head 4 is provided with a conical thread, and a milling surface 19 is provided on the conical thread, mainly to promote the flow of materials.

[0029] The utility model provides a friction stir welding tool. During operation, the upper end of the stirring needle 2 is fixed to the overall equipment through a connecting platform 18, the static shaft shoulder 1 is fixedly connected to the connecting sleeve 15, and the power system drives the stirring needle 2 to rotate at a high speed to achieve stirring welding operation.

Claims

1. A friction stir welding tool, characterized in that: The invention comprises a stationary shaft shoulder (1), a stirring needle (2), a stirring needle head (4), a rolling bearing (9), a bearing fixing sleeve (10), a connecting sleeve (15), and a plane bearing (16); a stirring needle head (4) is provided at the lower end of the stirring needle (2); a connecting portion (13) and a limiting portion (14) are provided on the stationary shaft shoulder (1); an internal thread (17) is provided in the inner cavity of the connecting sleeve (15); the stirring needle (2) is inserted into the inner cavity of the stationary shaft shoulder (1); the stationary shaft shoulder (1) is inserted into the connecting sleeve (15), a threaded pressing block is used to cooperate with the internal thread (17), the connecting portion (13) is screwed down, the limiting portion (14) is pressed against the lower flange of the connecting sleeve (15), and the stationary shaft shoulder (1) is fixed to the stationary shaft shoulder (1). The shaft shoulder (1) is fixed with the connecting sleeve (15); at the middle of the stirring needle (2), two or more rolling bearings (9) are arranged; the rolling bearings (9) are positioned by a bearing fixing sleeve (10); a plane bearing (16) is arranged at the upper end of the bearing fixing sleeve (10); the upper surface of the plane bearing (16) is limited by a limiting boss (11); the lower end of the bearing fixing sleeve (10) is limited by a boss on the static shaft shoulder (1); the upper end of the stirring needle (2) is positioned by a connecting platform (18) and fixedly connected to a driving fixture; the connecting sleeve (15) is fixedly mounted on surrounding equipment; the stirring needle (2) can rotate in the inner cavity of the static shaft shoulder (1) through the rolling bearing (9).

2. A friction stir welding tool according to claim 1, characterized in that: The stirring needle (2) is further provided with an auxiliary shaft shoulder (3) and a tapered section (5); a chip removal groove (6) is provided in an axial direction above the tapered section (5); and a plurality of chip removal holes (7) are provided in a portion of the static shaft shoulder (1) corresponding to the chip removal groove (6).

3. A friction stir welding tool according to claim 2, characterized in that: A chip removal ring groove (8) is connected to the upper end of the spiral upward chip removal groove (6).

4. A friction stir welding tool according to claim 2, characterized in that: The chip removal holes (7) include a plurality of slotted holes opened axially along the static shaft shoulder (1) and circular horizontal through holes located above and below the plurality of slotted holes, wherein the plurality of circular horizontal through holes are evenly distributed along the circumference of the static shaft shoulder (1).

5. The friction stir welding tool according to claim 2, characterized in that: A circular horizontal through hole is also provided between the plurality of slot-shaped holes on the static shaft shoulder (1).

6. The friction stir welding tool according to claim 1, characterized in that: A plurality of inclined through holes (12) are provided on the stationary shaft shoulder (1) at a position corresponding to the auxiliary shaft shoulder (3) of the stirring needle, and the inclined through holes (12) are evenly distributed along the circumference.

7. The friction stir welding tool according to claim 1, characterized in that: The stirring needle head (4) is provided with a conical thread, and the conical thread is provided with a milling surface (19), and three milling surfaces (19) are provided and are evenly distributed along the circumference.

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