Stirring head capable of being withdrawn

Abstract

The utility model relates to a pumpback stirring head which comprises a shaft shoulder and a drill bit. And the shaft rod of the drill bit is inserted into the shaft blind hole of the shaft shoulder in the axial direction, and the shaft rod continues to be inserted till the threaded section of the conical table completely enters the inclined hole area. The threaded rod drives the rotating disc to rotate in the embedding groove through the connecting rod, rotating motion of the threaded rod is converted into linear motion of the abutting rod, the abutting rod slides towards the shaft blind hole along the inclined hole, the first inclined face makes contact with the third plane of the shaft rod firstly, the first inclined face generates radial clamping force on the shaft rod through the wedge effect, and then the drill bit is fixedly arranged on the shaft shoulder. When the end face of the shaft shoulder is abraded or the root of the drill bit is broken, corresponding parts can be independently replaced, the shaft shoulder and the drill bit can be separated through a mechanical structure, independent adjustment of key parameters such as diameters and lengths of the shaft shoulder and the drill bit can be achieved, and the size of the shaft shoulder can be flexibly replaced or the length of the drill bit can be flexibly adjusted according to different-thickness workpiece or material combinations. And the process limitation caused by fixed parameters of a traditional integrated structure is avoided.

Description

Technical Field

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

[0002] In the field of friction stir welding, the stirring head is a core tool, and its structure directly determines the welding quality and process adaptability. Traditional stirring heads typically adopt an integrated design of the shoulder and stirring pin. This structure generates heat through friction between the shoulder and the workpiece surface during welding, while the rotating stirring pin stirs the material to achieve solid-state bonding. However, with the increasing demands for welding precision, material adaptability, and cost control in the industrial sector, welding different material combinations or special structural components requires matching specific shoulder and drill bit parameters. The traditional integrated structure cannot independently adjust key parameters such as shoulder diameter and drill bit length, making it difficult to meet diverse welding needs. Therefore, there is an urgent need for a stirring head with a detachable shoulder and stirring pin. Utility Model Content

[0003] The main purpose of this invention is to provide a retractable stirring head to solve the problem that the existing technology's traditional integrated structure cannot independently adjust key parameters such as the shoulder diameter and drill bit length, making it difficult to meet diverse welding needs.

[0004] To achieve the above objectives, this utility model provides a retractable stirring head, including a shoulder and a drill bit;

[0005] A blind hole is coaxially formed at the tail end of the shoulder, and one side of the blind hole has a first plane. An oblique hole is formed at the shoulder.

[0006] The inclined hole is connected to the shaft blind hole, and an internal threaded tube is coaxially fixed at one end. A screw is screwed onto the internal threaded tube. A push rod slides in the inclined hole. An insertion groove is opened at one end of the push rod. A turntable is rotatably embedded in the insertion groove. One end of the screw passes through the insertion groove and coaxially connects with the turntable through a connecting rod. An obtuse angle groove is opened on the push rod. One side wall of the obtuse angle groove forms the first inclined surface.

[0007] The drill bit includes a shaft and a coaxially mating shaft with a tapered truncated section at one end. The annular wall of the tapered truncated section is threaded along the axial direction. The shaft has a second plane and a third plane on both sides.

[0008] The shaft is inserted into the blind hole and passes through the obtuse-angled groove. The first plane abuts against the second plane, and the third plane can abut against the first inclined plane by rotating the screw.

[0009] A preferred embodiment is that the tail end of the shoulder has a circumferential plane and coaxially has an annular groove and a blind hole, the blind hole being located inside the annular groove and having a depth greater than the depth of the annular groove.

[0010] A preferred solution is to have a slotted or cross-shaped groove on the end of the screw furthest from the connecting rod.

[0011] A preferred option is that both the shoulder and the drill bit are made of steel, titanium alloy, or nickel-based alloy.

[0012] A preferred embodiment is that the shoulder comprises a head shaft, a middle shaft, a frustum shaft, and a tail shaft;

[0013] The head shaft, middle shaft, frustum shaft, and tail shaft are coaxially connected in sequence.

[0014] The diameter of the flared end of the frustum shaft is the same as the diameter of the central shaft, and the diameter of the constricted end is the same as the diameter of the tail shaft.

[0015] The end of the tail shaft furthest from the frustum axis forms a circumferential plane;

[0016] The oblique hole is made on the tail shaft.

[0017] A preferred embodiment is that the head shaft has a fourth plane along its axial direction, and the head shaft is inserted and fixed on the welding equipment.

[0018] A preferred solution is to have multiple annular heat dissipation grooves along the central shaft along its axial direction.

[0019] The beneficial effects of the above scheme are:

[0020] Insert the drill bit shaft along the shoulder axially into the blind hole. At this time, the second plane of the shaft makes surface contact with the first plane inside the blind hole. Circumferential positioning is achieved through planar fit to prevent the drill bit from rotating relative to the shoulder. The shaft continues to be inserted until the end of the shaft away from the tapered platform is completely in the inclined hole area. The end of the shaft away from the tapered platform abuts against the inner bottom wall of the blind hole. At this time, the third plane of the shaft is aligned with the opening end of the obtuse-angled groove. The screw in the internally threaded pipe rotates, and the screw drives the turntable to rotate in the embedded groove through the connecting rod. Since the turntable and the push rod are rotatably connected, the rotational motion of the screw is converted into the linear motion of the push rod. The push rod slides along the inclined hole towards the shaft blind hole, and the obtuse-angled groove at its end gradually wraps around the shaft. The first inclined surface first contacts the third plane of the shaft. As the push rod continues to advance, the first inclined surface generates a radial clamping force on the shaft through the wedge action, thereby completing the fixing of the drill bit on the shaft shoulder. The shaft shoulder and the drill bit adopt a separable structure. When the end face of the shaft shoulder is worn or the root of the drill bit is broken, the corresponding parts can be replaced separately. In addition, the shaft shoulder and the drill bit can be separated through a mechanical structure, which can realize the independent adjustment of key parameters such as diameter and length of the two. For workpieces of different thicknesses or material combinations, the shaft shoulder size or the drill bit length can be flexibly changed or adjusted, avoiding the process limitations caused by fixed parameters in traditional integrated structures. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a three-dimensional structural diagram of the retractable stirring head of this utility model;

[0023] Figure 2 This is a cross-sectional structural diagram of the retractable stirring head of this utility model;

[0024] Figure 3 This is a partial structural diagram of the retractable stirring head of this utility model in an exploded state.

[0025] Figure 4 This is a three-dimensional structural diagram of the retractable stirring head drill bit of this utility model;

[0026] Figure 5 yes Figure 2 A schematic diagram of the structure of region A in the diagram.

[0027] Explanation of reference numerals in the attached figures

[0028] 10. Shoulder; 11. Blind hole; 110. First plane; 12. Inclined hole; 13. Internally threaded tube; 14. Screw; 140. Slot; 15. Abutment; 150. Embedded groove; 16. Turntable; 17. Connecting rod; 1501. Obtuse-angled groove; 1502. First inclined surface; 18. Annular groove; 101. Head shaft; 102. Middle shaft; 103. Frustum shaft; 104. Tail shaft; 1010. Fourth plane; 1020. Annular heat dissipation groove; 20. Drill bit; 21. Shaft; 22. Conical frustum; 220. Threaded section; 210. Second plane; 211. Third plane. Detailed Implementation

[0029] 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.

[0030] Example:

[0031] like Figures 1-5 As shown, this embodiment provides a retractable stirring head, including a shoulder 10 and a drill bit 20. Both the shoulder 10 and the drill bit 20 are made of steel, titanium alloy, or nickel-based alloy. A blind hole 11 is coaxially formed at the tail end of the shoulder 10, as shown... Figure 2As shown, one side of the shaft blind hole 11 has a first plane 110, and the shaft shoulder 10 has an inclined hole 12. The inclined hole 12 communicates with the shaft blind hole 11, and one end of the inclined hole 12 is coaxially fixed with an internally threaded tube 13. A screw 14 is screwed onto the internally threaded tube 13, and a stop rod 15 slides inside the inclined hole 12. Figure 3 As shown, one end of the abutment 15 has an insertion groove 150, and a turntable 16 is rotatably embedded in the insertion groove 150, as shown. Figure 5 As shown, one end of the screw 14 passes through the connecting rod 17 and coaxially engages with the turntable 16 in the insertion groove 150. The end of the screw 14 furthest from the connecting rod 17 has a slot 140 or a cross-shaped groove. The slot 140 or cross-shaped groove design facilitates the rotation of the screw 14. The abutment rod 15 has an obtuse-angled groove 1501, and one side wall of the obtuse-angled groove 1501 forms a first inclined surface 1502. (The text repeats itself here.) Figure 4 As shown, the drill bit 20 includes a shaft 21 and a conical platform 22 at one end of the coaxially mating shaft 21. The annular wall of the conical platform 22 has a threaded section 220 along the axial direction. The threaded section 220 is trumpet-shaped. The shaft 21 has a second plane 210 and a third plane 211 on both sides. The shaft 21 is inserted into the shaft blind hole 11 and passes through the obtuse angle groove 1501. The first plane 110 abuts against the second plane 210, and the third plane 211 can abut against the first inclined surface 1502 by rotating the screw 14.

[0032] Insert the shaft 21 of the drill bit 20 into the shaft blind hole 11 along the axial direction of the shoulder 10. At this time, the second plane 210 of the shaft 21 forms a surface contact with the first plane 110 inside the shaft blind hole 11. The circumferential positioning is achieved through the planar fit to prevent the drill bit 20 from rotating relative to the shoulder 10. The shaft 21 continues to be inserted until the end of the shaft 12 away from the tapered platform 22 is completely entered into the inclined hole 12 area. The end of the shaft away from the tapered platform abuts against the inner bottom wall of the shaft blind hole. At this time, the third plane 211 of the shaft 21 is aligned with the opening end of the obtuse angle groove 1501. The screw 14 in the internally threaded tube 13 rotates, and the screw 14 drives the turntable 16 to rotate within the embedded groove 150 via the connecting rod 17. Since the turntable 16 and the push rod 15 are rotatably connected, the rotational motion of the screw 14 is converted into the linear motion of the push rod 15. The push rod 15 slides along the inclined hole 12 toward the shaft blind hole 11, and the obtuse-angled groove 1501 at its end gradually wraps around the shaft 21. The first inclined surface 1502 first contacts the third plane 211 of the shaft 21. As the push rod 15 continues to advance, the first inclined surface 1502 acts as a wedge against the shaft. Rod 21 generates radial clamping force, thereby fixing drill bit 20 onto shoulder 10. Shoulder 10 and drill bit 20 adopt a separable structure. When the end face of shoulder 10 is worn or the root of drill bit 20 is broken, the corresponding parts can be replaced separately. In addition, shoulder 10 and drill bit 20 can be separated through mechanical structure, which can realize independent adjustment of key parameters such as diameter and length of the two. For workpieces of different thicknesses or material combinations, the size of shoulder 10 or the length of drill bit 20 can be flexibly changed or adjusted, avoiding the process limitations caused by fixed parameters in traditional one-piece structures.

[0033] like Figure 1 As shown, the tail end of the shoulder 10 has a circumferential plane (not shown), and the shoulder 10 is coaxially fitted with an annular groove 18 and a blind hole 11. The blind hole 11 is located within the annular groove 18, and its depth is greater than that of the annular groove 18. The drill bit 20 generates metal shavings that fill the annular groove 18. These shavings quickly conduct the heat generated by the friction of the shoulder 10 to the outside, preventing localized overheating of the shoulder 10 that could lead to material softening or deformation, thus extending the service life of the stirring head. Furthermore, the shavings filling layer absorbs instantaneous heat fluctuations during welding, reducing thermal shock between the shoulder 10 and the workpiece, decreasing the width of the heat-affected zone of the weld, and improving weld quality.

[0034] like Figure 1As shown, the shoulder 10 includes a head shaft 101, a middle shaft 102, a frustum shaft 103, and a tail shaft 104. The head shaft 101, middle shaft 102, frustum shaft 103, and tail shaft 104 are coaxially connected sequentially. The diameter of the flared end of the frustum shaft 103 is the same as the diameter of the middle shaft 102, and the diameter of the constricted end of the frustum shaft 103 is the same as the diameter of the tail shaft 104. The end of the tail shaft 104 away from the frustum shaft 103 forms a circumferential plane. An oblique hole 12 is formed on the tail shaft 104. The middle shaft 102 has multiple annular heat dissipation grooves 1020 along its axial direction. The annular heat dissipation grooves 1020 facilitate heat dissipation. The head shaft 101 has a fourth plane 1010 along its axial direction, and the head shaft 101 is inserted and fixed to a welding device in the prior art.

[0035] 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 retractable stirring head, characterized in that, include: A shoulder, wherein a blind hole is coaxially formed at the tail end of the shoulder, and one side of the blind hole has a first plane, and an oblique hole is formed at an angle on the shoulder; The oblique hole is connected to the shaft blind hole, and an internally threaded tube is coaxially fixed at one end. A screw is screwed onto the internally threaded tube. A push rod is slidably installed in the oblique hole. An embedded groove is opened at one end of the push rod. A turntable is rotatably embedded in the embedded groove. One end of the screw passes through the embedded groove and coaxially connects with the turntable through a connecting rod. An obtuse-angled groove is opened on the push rod. One side wall of the obtuse-angled groove forms a first inclined surface. A drill bit includes a shaft and a tapered truncated section at one end of the shaft, the tapered truncated section having a threaded section on its annular wall, and the shaft having a second plane and a third plane on both sides; The shaft is inserted into the shaft blind hole and passes through the obtuse angle groove. The first plane abuts against the second plane, and the third plane can abut against the first inclined plane by rotating the screw.

2. The retractable stirring head according to claim 1, characterized in that, The tail end of the shoulder has a circumferential plane and coaxially forms an annular groove and a blind hole. The blind hole is located within the annular groove and has a depth greater than the depth of the annular groove.

3. The retractable stirring head according to claim 1, characterized in that, A slot or cross slot is formed at the end of the screw that is away from the connecting rod.

4. The retractable stirring head according to claim 1, characterized in that, Both the shoulder and the drill bit are made of steel, titanium alloy, or nickel-based alloy.

5. The retractable stirring head according to claim 2, characterized in that, The shoulder includes a head shaft, a middle shaft, a frustum shaft, and a tail shaft; The head shaft, the middle shaft, the frustum shaft, and the tail shaft are coaxially connected in sequence. The diameter of the flared end of the frustum shaft is the same as the diameter of the central shaft, and the diameter of the constricted end is the same as the diameter of the tail shaft. The end of the tail shaft away from the frustum axis forms the circumferential plane; The oblique hole is formed on the tail shaft.

6. The retractable stirring head according to claim 5, characterized in that, The head shaft has a fourth plane along its axial direction, and the head shaft is inserted and fixed on the welding equipment.

7. The retractable stirring head according to claim 5, characterized in that, The central shaft has multiple annular heat dissipation grooves along its axial direction.

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