A retractable static shaft shoulder friction stir welding device

Abstract

The utility model relates to the technical field of friction stir welding, especially to a static axle shoulder friction stir welding device with retractable function. The utility model discloses a static axle shoulder friction stir welding device with retractable function, which comprises a retractable welding mechanism and a static axle shoulder mechanism. The retractable welding mechanism is used for welding the gap between the workpieces to be welded. The static axle shoulder mechanism is arranged outside the retractable welding mechanism and is used for smoothing the surface of the weld. The utility model provides a static axle shoulder friction stir welding device with retractable function. The retractable welding mechanism and the static axle shoulder mechanism are used to achieve the effect of smooth weld and no keyhole at the end of the weld, thereby solving the technical problem of eliminating the keyhole of traditional friction welding by adding a process.

Description

Technical Field

[0001] This utility model relates to the field of friction stir welding technology, and in particular to a retractable static shoulder friction stir welding device. Background Technology

[0002] Conventional friction stir welding often produces keyholes at the weld end. Keyholes are an inherent characteristic of the friction stir welding process; they are holes formed when the space previously occupied by the stirring pin is not filled by the workpiece after the stirring pin is withdrawn. The presence of keyholes not only affects the appearance of the welded structure but also significantly impacts the quality of the weld joint.

[0003] In the aerospace field, during the manufacturing process of aluminum alloy rotating structural components such as launch vehicle tanks, there are a large number of closed circumferential welds. The traditional lead-out plate elimination method cannot be used to eliminate keyholes. Currently, the retractable friction stir welding process is widely used in engineering to eliminate keyholes. However, retractable friction stir welding still has the problem of an uneven weld surface.

[0004] Stationary shoulder friction stir welding (SSFSW) is a novel friction stir welding method. It mainly consists of a rotating stirring pin and a stationary shoulder that rubs against the workpiece during the welding process. In conventional friction stir welding, the heat input primarily comes from the rotational friction between the shoulder and the material, and between the stirring pin and the material. However, in stationary shoulder friction stir welding, the shoulder does not rotate; it only slides relative to the workpiece. The heat input mainly comes from the mutual friction between the stirring pin and the material. Compared to conventional friction stir welding, the heat input is reduced, the heat-affected zone is significantly smaller, and the weld surface is smoother. Utility Model Content

[0005] This invention provides a retractable static shoulder friction stir welding device, which utilizes a retractable welding mechanism and a static shoulder mechanism to achieve a smooth weld with no keyhole at the weld end, thus solving the technical problem of needing to add a process to eliminate the keyhole in traditional friction welding.

[0006] To achieve this technical objective, the present invention adopts the following solution: a retractable static shoulder friction stir welding device, comprising a retractable welding mechanism and a static shoulder mechanism;

[0007] The retractable welding mechanism is used to weld the gap between workpieces.

[0008] The stationary shoulder mechanism is located outside the retractable welding mechanism to smooth the surface of the weld.

[0009] Furthermore, the retractable welding mechanism includes a spindle, a tool holder, a connecting shank, and a stirring needle;

[0010] The tool holder is fixedly mounted at the bottom of the spindle;

[0011] The connecting shank and tool holder are connected by a drive mechanism.

[0012] The stirring needle is fixedly mounted at the bottom of the connecting handle.

[0013] Furthermore, a frustum-shaped limiting groove coaxial with the spindle is provided at the bottom of the spindle;

[0014] The top of the tool holder is provided with a limiting frustum that matches the shape of the limiting groove. The limiting frustum and the tool holder are coaxially arranged, and the limiting frustum is embedded in the limiting groove.

[0015] Furthermore, the tool holder and the spindle are fixedly connected by the first screw.

[0016] Furthermore, the connecting shank and the tool holder are connected by a key.

[0017] Furthermore, the stirring needle and the connecting handle are fixedly connected by threads.

[0018] Furthermore, a spindle sleeve is rotatably connected to the outer side of the bottom of the spindle.

[0019] Furthermore, the static shoulder mechanism includes an adapter sleeve, a nut, and a bushing;

[0020] The adapter sleeve and the spindle outer sleeve are fixedly connected. The adapter sleeve is fitted on the outer side of the bottom of the spindle and the outer side of the tool holder.

[0021] The bushing with a pre-reserved gap is fitted onto the outside of the stirring needle; the nut is threaded onto the bottom of the adapter sleeve to press and fix the bushing to the bottom of the adapter sleeve.

[0022] Furthermore, the adapter sleeve is fixedly connected to the spindle sleeve by a second screw.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] The present invention discloses a retractable static shoulder device that combines the advantages of static shoulder friction stir welding and retractable friction stir welding, resulting in a weld that has the smooth weld appearance of static shoulder friction welding, but without the keyhole of traditional friction welding at the end of the weld. Attached Figure Description

[0025] Figure 1 A schematic diagram of a retractable static shaft shoulder friction stir welding device provided for an embodiment of this utility model;

[0026] Figure 2A cross-sectional view of a retractable static shoulder friction stir welding device provided for an embodiment of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Spindle; 2. Tool holder; 3. Connecting handle; 4. Stirring needle; 5. Adapter sleeve; 6. Nut; 7. Bushing; 8. Key; 9. Second screw; 10. Limiting groove; 11. Limiting frustum; 12. Tie rod; 13. Spindle outer sleeve. Detailed Implementation

[0029] To fully understand the purpose, features and effects of this utility model, the following specific embodiments will be used to describe this utility model in detail, but this utility model is not limited thereto.

[0030] like Figure 1 , Figure 2 As shown, the present invention provides a retractable static shoulder friction stir welding device, which includes a retractable welding mechanism and a static shoulder mechanism.

[0031] The retractable welding mechanism is used to weld gaps between workpieces. The retractable welding mechanism includes a spindle 1, a tool holder 2, a connecting handle 3, and a stirring needle 4. The tool holder 2 is fixedly installed at the bottom of the spindle 1, the connecting handle 3 is inserted into the tool holder 2, and the connecting handle 3 and the tool holder 2 are connected in a driving manner. The stirring needle 4 is fixedly installed at the bottom of the connecting handle 3.

[0032] In use, the spindle 1 drives the tool holder 2 to rotate, the tool holder 2 drives the connecting handle 3 to rotate, and the connecting handle 3 drives the stirring pin 4 to rotate. The stirring pin 4 stirs the material during the welding process, so that the material reaches a plastic flow state. When the welding is finished, the stirring pin 4 is gradually removed from the material to be welded, and a keyless friction stir weld is obtained.

[0033] Preferably, the spindle 1 and the tool holder 2 are coaxially arranged. In one embodiment, the bottom of the spindle 1 has a frustum-shaped limiting groove 10 coaxial with it; the top of the tool holder 2 has a limiting frustum 11 matching the shape of the limiting groove 10. The limiting frustum 11 and the tool holder 2 are coaxially arranged, and the limiting frustum 11 is embedded within the limiting groove 10. The limiting frustum 11 and the limiting groove 10 are coaxial, thereby ensuring that the spindle 1 and the tool holder 2 are coaxial.

[0034] It should be explained that the top of the connecting handle 3 is fixedly connected to the pull rod 12 of the external retraction device. During use, the pull rod 12 of the retraction device can drive the connecting handle 3 to move up and down, thereby driving the stirring needle 4 to move up and down. During this process, the knife handle 2 will not move up and down. The retraction device and its connection relationship with the connecting handle 3 can adopt existing technology and are not the inventive point of this application, so this application will not elaborate on them further.

[0035] Furthermore, the tool holder 2 and the spindle 1 are fixedly connected by the first screw.

[0036] Furthermore, the connecting shank 3 and the tool holder 2 are connected by a key 8 for transmission.

[0037] Furthermore, the stirring needle 4 and the connecting handle 3 are fixedly connected by threads.

[0038] Furthermore, a spindle sleeve 13 is rotatably connected to the outer side of the bottom of the spindle 1.

[0039] The stationary shoulder mechanism is located outside the retractable welding mechanism to smooth the weld surface. The stationary shoulder mechanism includes an adapter sleeve 5, a nut 6, and a bushing 7. The adapter sleeve 5 is fixedly connected to the main spindle outer sleeve 13, and is fitted onto the outer side of the bottom of the main spindle 1 and the outer side of the tool holder 2. The bushing 7 is fitted onto the outside of the stirring needle 4 with a pre-drilled gap. The nut 6 is threaded to the bottom of the adapter sleeve 5 to press and fix the bushing 7 to the bottom of the adapter sleeve 5, allowing the stirring needle 4 to extend from within the bushing 7. Because the main spindle outer sleeve and the main spindle 1 are rotatably connected, and the bushing 7 is in contact with the weld surface, the adapter sleeve 5 remains stationary, not rotating with the main spindle 1. The stationary shoulder of the stationary shoulder mechanism reduces heat input during welding, decreasing the temperature gradient along the thickness and resulting in a smoother weld surface.

[0040] Furthermore, the adapter sleeve 5 is fixedly connected to the spindle sleeve by the second screw 9.

[0041] During the welding process, the shoulder of the bushing 7 does not rotate, but only slides relative to the workpiece. The welding heat input mainly comes from the mutual friction between the stirring pin 4 and the material. At the end of the welding, the stirring pin 4 is gradually withdrawn from the workpiece, and at the same time, the shoulder is pressed down. When the stirring pin 4 is completely separated from the base material, a keyhole-free friction stir weld is obtained.

[0042] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A retractable stationary shoulder friction stir welding device, characterized in that, Includes a retractable welding mechanism and a stationary shoulder mechanism; The retractable welding mechanism is used to weld the gap between workpieces to be welded. The stationary shoulder mechanism is located outside the retractable welding mechanism and is used to smooth the surface of the weld.

2. The retractable stationary shoulder friction stir welding device according to claim 1, characterized in that, The retractable welding mechanism includes a main shaft (1), a tool holder (2), a connecting handle (3), and a stirring needle (4); The tool holder (2) is fixedly disposed at the bottom of the spindle (1); The connecting handle (3) and the tool holder (2) are connected by a transmission. The stirring needle (4) is fixedly disposed at the bottom of the connecting handle (3).

3. The retractable stationary shoulder friction stir welding device according to claim 2, characterized in that, The bottom of the main shaft (1) is provided with a frustum-shaped limiting groove (10) coaxial with it; The top of the tool holder (2) is provided with a limiting frustum (11) that matches the shape of the limiting groove (10). The limiting frustum (11) and the tool holder (2) are coaxially arranged, and the limiting frustum (11) is embedded in the limiting groove (10).

4. The retractable stationary shoulder friction stir welding device according to claim 2, characterized in that, The tool holder (2) and the spindle (1) are fixedly connected by a first screw.

5. The retractable stationary shoulder friction stir welding device according to claim 2, characterized in that, The connecting handle (3) and the knife handle (2) are connected by a key (8).

6. The retractable stationary shoulder friction stir welding device according to claim 2, characterized in that, The stirring needle (4) and the connecting handle (3) are fixedly connected by threads.

7. The retractable stationary shoulder friction stir welding device according to claim 3, characterized in that, The outer side of the bottom of the main shaft (1) is rotatably connected to the main shaft sleeve (13).

8. The retractable stationary shoulder friction stir welding device according to claim 7, characterized in that, The static shaft shoulder mechanism includes an adapter sleeve (5), a nut (6), and a bushing (7); The adapter sleeve (5) and the spindle sleeve (13) are fixedly connected. The adapter sleeve (5) is sleeved on the outside of the bottom of the spindle (1) and the outside of the tool holder (2). The bushing (7) is fitted outside the stirring needle (4) with a reserved gap, and the nut (6) is threaded to the bottom of the adapter sleeve (5) to press and fix the bushing (7) to the bottom of the adapter sleeve (5).

9. A retractable stationary shoulder friction stir welding device according to claim 8, characterized in that, The adapter sleeve (5) is fixedly connected to the spindle sleeve by the second screw (9).

Images