Static shaft shoulder stirring head

Abstract

The utility model relates to a stationary shaft shoulder stirring head which comprises a shaft shoulder and a stirring head coaxially butted with the tail end of the shaft shoulder, the stirring head is of a circular truncated cone structure, the flaring end of the stirring head is coaxially butted with the tail end of the shaft shoulder, and a threaded groove is formed in the annular wall in the axial direction of the stirring head; the stirring head of the circular truncated cone structure is adopted, the design of the axial thread grooves in the annular wall can play a spiral flow guide role on softened metal materials, the problem of material overflow caused by a traditional plane shaft shoulder is effectively avoided, the welding seam filling rate and the joint compactness are remarkably improved, and defects are reduced. Through the synergistic effect of the circular truncated cone structure and the threaded groove, stress is dispersed through the continuous and smooth geometrical shape, the problem of stress concentration caused by multi-groove spaced arrangement of involute grooves in the prior art is solved, meanwhile, the design that the flaring end of the stirring head is embedded into the shaft shoulder ring groove enhances the connection stability, vibration abrasion under high-speed rotation is reduced, and the stirring effect is improved. Durability of the stirring head is remarkably improved, and use cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of friction stir welding technology, specifically to a static shoulder stirring head. Background Technology

[0002] Friction stir welding (FSW) is a highly efficient and environmentally friendly solid-state joining process. In the field of FSW technology, the stirring head is the core tool, and its structural design directly determines the mechanical properties and forming quality of the welded joint. For example, Chinese Utility Model Patent CN216298266U discloses a stirring head and friction stir welding equipment, which combines an involute groove with a convex conical surface. While this design optimizes material aggregation to some extent, the involute groove requires extremely high machining precision, and the multiple grooves spaced apart can easily lead to stress concentration. In actual production, manufacturing errors or wear may cause the material flow path to deviate from the design expectation. The included angle range of the convex conical surface (3°-7°) is relatively rigid, making it difficult to adapt to different plate thicknesses and process parameter combinations. Furthermore, the fit between the conical surface and the involute groove requires high equipment coordination, and it does not fundamentally solve the problem of insufficient material filling during thin-plate welding. Utility Model Content

[0003] The main purpose of this invention is to provide a static shoulder stirring head to solve the problem that existing stirring heads and friction stir welding equipment have high requirements for equipment coordination in terms of the fit between the conical surface and the involute groove, and do not fundamentally solve the problem of insufficient material filling during thin plate welding.

[0004] To achieve the above objectives, this utility model provides a static shoulder stirring head, including a shoulder and a stirring head coaxially connected to the tail end of the shoulder. The stirring head has a frustum structure, and the flared end of the stirring head is coaxially connected to the tail end of the shoulder, and the annular wall has a threaded groove along its axial direction.

[0005] The shoulder has a circular plane at its tail end, and multiple annular grooves of different diameters are opened coaxially on the circular plane. The flared end of the stirring head is located in the multiple annular grooves, and the diameter of the multiple annular grooves gradually decreases as they approach the stirring head.

[0006] A preferred embodiment is that the annular wall of the stirring head has at least one inclined surface, the depth of which is greater than the depth of the threaded groove.

[0007] A preferred embodiment is that the annular wall of the stirring head has two inclined surfaces, and the two inclined surfaces are symmetrically arranged on both sides of the stirring head.

[0008] A preferred embodiment is that the shoulder includes a clamping shaft, a main shaft, a frustum shaft, and a secondary shaft;

[0009] The clamping shaft, main shaft, frustum shaft, and auxiliary shaft are sequentially and coaxially connected.

[0010] The diameter of the spindle is larger than the diameter of the clamping shaft;

[0011] The diameter of the flared end of the frustum shaft is the same as the diameter of the main shaft, and the diameter of the constricted end is the same as the diameter of the secondary shaft.

[0012] The end of the secondary shaft furthest from the frustum axis forms a circular plane.

[0013] A preferred embodiment is that the clamping shaft used for fixed connection of the welding equipment has an installation stop along its axial direction.

[0014] A preferred embodiment is that the spindle has multiple annular heat dissipation grooves along its axial direction.

[0015] A preferred embodiment is that the shoulder and the stirring head are integrated into one structure.

[0016] A preferred embodiment is that both the shoulder and the stirring head are made of magnesium alloy.

[0017] The beneficial effects of the above scheme are:

[0018] This invention employs a frustum-shaped stirring head with an axially threaded groove design on its annular wall. This design creates a spiral guiding effect on softened metal materials. Multiple annular grooves of varying diameters are coaxially formed on the circular plane. The flared end of the stirring head is located within these grooves, which gradually decrease in diameter as they approach the head. This promotes dynamic material accumulation towards the welding center during stirring, effectively avoiding material overflow problems caused by traditional planar shoulders. This significantly improves weld filling rate and joint density, and reduces defect formation. The synergistic effect of the frustum structure and the threaded grooves disperses stress through a continuous and smooth geometric shape, avoiding stress concentration problems caused by the multiple-groove spacing of involute grooves in existing technologies. Simultaneously, the design of the flared end of the stirring head embedding into the shoulder annular groove enhances connection stability, reduces vibration wear under high-speed rotation, significantly improves the durability of the stirring head, and lowers operating costs. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a three-dimensional structural diagram of the static shaft shoulder stirring head of this utility model;

[0021] Figure 2 This is a front view structural diagram of the static shaft shoulder stirring head of this utility model.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Shoulder; 11. Clamping shaft; 12. Main shaft; 120. Annular heat dissipation groove; 13. Frustum shaft; 110. Mounting stop; 10. Secondary shaft; 100. Annular groove;

[0024] 2. Stirring head; 21. Threaded groove; 22. Inclined surface. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Example:

[0027] like Figure 1 , Figure 2 As shown, this embodiment provides a stationary shoulder stirring head, including a shoulder 1 and a stirring head 2 coaxially connected to the tail end of the shoulder 1. The shoulder 1 and the stirring head 2 are an integral structure. Both are made of magnesium alloy. Magnesium alloy has many advantages such as low density, high specific strength, large specific elastic modulus, good heat dissipation and shock absorption, strong impact load resistance, and strong corrosion resistance, making it an important raw material in the field of lightweighting. The integrated structure design increases the overall stability of the stationary shoulder stirring head. The stirring head 2 has a frustum structure, and the flared end of the stirring head 2 is coaxially connected to the tail end of the shoulder 1. The annular wall of the stirring head 2 has a threaded groove 21 along its axial direction, and the threaded groove 21 is trumpet-shaped. The tail end of the shoulder 1 forms a circular plane, and multiple annular grooves 100 of different diameters are coaxially formed on the circular plane. The flared end of the stirring head 2 is located within the multiple annular grooves 100, and the diameter of the multiple annular grooves 100 gradually decreases as they approach the stirring head 2.

[0028] This invention employs a frustum-shaped stirring head 2 with an axially threaded groove 21 on its annular wall. This groove creates a spiral flow guide for softened metal materials. Multiple annular grooves 100 of varying diameters are coaxially formed on the circular plane. The flared end of the stirring head 2 is located within these grooves 100. The grooves 100 gradually decrease in diameter as they approach the stirring head 2, promoting dynamic material accumulation towards the welding center during stirring. This effectively avoids the material overflow problem caused by the traditional planar shoulder 1, significantly improving weld filling rate and joint density, and reducing defect formation. The synergistic effect of the frustum structure and the threaded groove 21 disperses stress through a continuous and smooth geometric shape, avoiding the stress concentration problem caused by the multiple grooves spaced apart in involute grooves in existing technologies. Simultaneously, the design of the flared end of the stirring head 2 embedded in the annular groove 100 of the shoulder 1 enhances connection stability, reduces vibration wear under high-speed rotation, significantly improves the durability of the stirring head 2, and reduces operating costs.

[0029] At least one inclined surface 22 is formed on the circumference of the annular wall of the stirring head 2, and the depth of the inclined surface 22 is greater than the depth of the threaded groove 21. Two inclined surfaces 22 are formed on the circumference of the annular wall of the stirring head 2, and the two inclined surfaces 22 are symmetrically arranged on both sides of the stirring head 2. The depth of the inclined surfaces 22 on the circumference of the annular wall is greater than that of the threaded groove 21, which can form a stepped flow guiding structure during stirring. The inclined surfaces 22 increase the material flow space, promote the efficient accumulation of softened metal towards the welding center, and work in conjunction with the threaded groove 21 to achieve layered flow guiding, further reducing material overflow and spatter, and significantly improving the weld filling rate and joint tightness. In addition, the two symmetrical inclined surfaces 22 are distributed on both sides of the frustum structure. The symmetrical design ensures that the stirring head 2 is subjected to uniform force during rotation, effectively reducing the eccentric torque and vibration problems caused by uneven material flow. Especially in thin plate welding, it can reduce the risk of shoulder 1 misalignment, ensure a smooth welding process, and avoid defect generation.

[0030] The shoulder 1 includes a clamping shaft 11, a main shaft 12, a frustum shaft 13, and a secondary shaft 10. The clamping shaft 11, main shaft 12, frustum shaft 13, and secondary shaft 10 are coaxially connected sequentially. The diameter of the main shaft 12 is larger than the diameter of the clamping shaft 11. The diameter of the flared end of the frustum shaft 13 is the same as the diameter of the main shaft 12, and the diameter of the constricted end is the same as the diameter of the secondary shaft 10. The end of the secondary shaft 10 away from the frustum shaft 13 forms a circular plane. The clamping shaft 11, used for fixed connection with welding equipment, has a mounting stop 110 along its axial direction. The mounting stop 110 is used to adapt to existing welding equipment. The main shaft 12 has multiple annular heat dissipation grooves 120 along its axial direction. The annular heat dissipation grooves 120 facilitate heat dissipation. The end of the clamping shaft 11 away from the main shaft forms the front end of the shoulder shaft.

[0031] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A stationary shoulder stirring head, comprising a shoulder and a stirring head coaxially connected to the tail end of the shoulder, characterized in that, The stirring head has a frustum structure, and the flared end of the stirring head is coaxially connected with the tail end of the shoulder, and the annular wall has a threaded groove along its axial direction. The shoulder has a circular plane at its tail end, and multiple annular grooves of different diameters are coaxially formed on the circular plane. The flared end of the stirring head is located in the multiple annular grooves, and the diameter of the multiple annular grooves gradually decreases as they approach the stirring head.

2. The stationary shoulder stirring head according to claim 1, characterized in that, The stirring head has at least one inclined surface on its circumference, and the depth of the inclined surface is greater than the depth of the threaded groove.

3. The stationary shoulder stirring head according to claim 2, characterized in that, The stirring head has two inclined surfaces on its circumference, and the two inclined surfaces are symmetrically arranged on both sides of the stirring head.

4. The stationary shoulder stirring head according to claim 2, characterized in that, The shoulder includes a clamping shaft, a main shaft, a frustum shaft, and a secondary shaft; The clamping shaft, the main shaft, the frustum shaft, and the secondary shaft are sequentially coaxially connected. The diameter of the main shaft is larger than the diameter of the clamping shaft; The diameter of the flared end of the frustum shaft is the same as the diameter of the main shaft, and the diameter of the constricted end is the same as the diameter of the secondary shaft. The end of the secondary shaft away from the frustum axis forms the circular plane.

5. The stationary shoulder stirring head according to claim 4, characterized in that, The clamping shaft used for fixed connection of welding equipment has an installation stop surface along its axial direction.

6. The stationary shoulder stirring head according to claim 4, characterized in that, The main shaft has multiple annular heat dissipation grooves along its axial direction.

7. The stationary shoulder stirring head according to any one of claims 1-6, characterized in that, The shoulder and the stirring head are an integral structure.

8. The stationary shoulder stirring head according to any one of claims 1-6, characterized in that, Both the shoulder and the stirring head are made of magnesium alloy.

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