Welding and milling integrated stirring head

Abstract

The utility model relates to the technical field of friction stir welding, in particular to a welding and milling integrated stirring head. Through the specific design of the flash cutter main body, the cutter main body and the chip groove which spirally extend cannot be formed on the stirring head, so that the winding and adhesion of the flash are eliminated, the sustainable working time is prolonged, and the cutting quality is improved; meanwhile, the processing and manufacturing difficulty of the stirring head is greatly reduced, and the manufacturing cost is reduced. Specifically, the welding and milling integrated stirring head comprises a clamping part, a stirring head main body part, a shaft shoulder and a stirring needle which are sequentially connected, a flash cutting knife is arranged on the part, close to the shaft shoulder, of the stirring head main body part, and the flash cutting knife comprises a main cutting edge and a flash cutting knife main body; the minimum vertical distance from the flash cutter main body to the end face of the shaft shoulder is greater than 0; the maximum length of the flash cutter body extending from the front end to the rear end is smaller than one third of the perimeter of the shaft shoulder. The maximum width and the maximum thickness of the flash cutting knife body are both smaller than the maximum length of the flash cutting knife body extending from the front end to the rear end.

Description

Technical Field

[0001] The utility model relates to the technical field of friction stir welding, and particularly relates to a welding and milling integrated stirring head. Background Art

[0002] As the best welding technology for aluminum alloys, friction stir welding is a new type of solid-phase connection technology. During the welding process, the material does not melt, and there are problems such as low welding residual stress and no arc light and dust in the welding process. However, there are still some technical problems in the current friction stir welding process. For example, the flash and flash defects generated during welding are very difficult to remove during the welding process and need to be removed through separate additional processes, which are either time-consuming and laborious or difficult to guarantee the quality.

[0003] To solve the above deficiencies, the applicant submitted a Chinese utility model patent with the application number 2024208792027, which discloses a stirring head capable of removing welding flash. Through the design of a cutting tool and a helically extending cutting tool body, the flash generated during the welding process is effectively removed and discharged. However, in the actual implementation process, it is found that this solution still has some disadvantages: Although this solution is very effective for removing and discharging flash during short-time welding, for scenarios that require long-time welding and cutting flash, as the cutting time increases, the helically extending cutting tool body and the chip removal groove will gradually accumulate heat and the temperature will rise, and then it is easy to adhere to or entangle the cut flash, especially at the root of the cutting tool body and the inner edge of the chip removal groove, where it is easier to adhere to long strip-shaped flash and fine flash chips. With the adhesion or entanglement of these flash and flash chips, not only the cutting quality is affected, but even when the flash and flash chips accumulate to a certain amount, normal cutting cannot be carried out. In addition, the presence of the helically extending cutting tool body also increases the processing and manufacturing difficulty of the stirring head and raises the manufacturing cost. Summary of the Utility Model

[0004] To address the above deficiencies, the present utility model provides a welding and milling integrated stirring head. Through the design that the minimum vertical distance from the main body of the flash cutting tool to the end face of the shoulder is greater than 0, and the maximum length of the main body of the flash cutting tool extending from the front end to the rear end is less than one-third of the circumference of the shoulder, no spiral-extending cutting tool main body and chip removal groove will be formed on the stirring head, reducing or even eliminating the entanglement and adhesion of flash, improving the sustainable working duration and cutting quality; at the same time, it also greatly reduces the processing and manufacturing difficulty of the stirring head and reduces the manufacturing cost. Specifically, a welding and milling integrated stirring head provided by the present utility model includes a clamping portion, a stirring head main body portion, a shoulder, and a stirring pin connected in sequence. A flash cutting tool is provided at a portion of the stirring head main body portion close to the shoulder. The flash cutting tool includes a main cutting edge and a main body of the flash cutting tool; the minimum vertical distance from the main body of the flash cutting tool to the end face of the shoulder is greater than 0; the maximum length of the main body of the flash cutting tool extending from the front end to the rear end is less than one-third of the circumference of the shoulder; both the maximum width and the maximum thickness of the main body of the flash cutting tool are less than the maximum length of the main body of the flash cutting tool extending from the front end to the rear end.

[0005] In some embodiments, the flash cutting tool further includes a first tool face and a second tool face; the first tool face and the second tool face intersect to form a secondary cutting edge, and the length of the secondary cutting edge is less than the length of the main cutting edge.

[0006] In some embodiments, the minimum vertical distance from the main body of the flash cutting tool to the end face of the shoulder is not less than 0.1 mm.

[0007] In some embodiments, the maximum length of the main body of the flash cutting tool extending from the front end to the rear end is less than one-fifth of the circumference of the shoulder.

[0008] In some embodiments, the stirring head main body portion is provided with anti-slip grooves.

[0009] In some embodiments, at least one layer of hard coating is provided on the surface of the shoulder, the surface of the stirring pin, the surface of the flash cutting tool, and the surface of the portion of the stirring head main body portion close to the shoulder.

[0010] In some embodiments, the hard coating includes at least one of a TiN coating, a TiC coating, an Al2O3 coating, a diamond coating, a TiAlSi coating, and a TiAlN coating.

[0011] In some embodiments, the number of the flash cutting tools provided is greater than 1, and a chip removal groove is formed between adjacent cutting tools.

[0012] In some embodiments, a shoulder groove structure is provided on the shoulder. The shoulder groove structure (31) is one of a concentric circular ring structure, an Archimedes spiral structure, and a conical surface groove structure.

[0013] In some embodiments, the side surface of the stirring pin is provided with a stirring pin thread and at least one stirring pin cutting edge.

[0014] In some embodiments, there are more than 2 stirring pin cutting edges provided on the side surface of the stirring pin.

[0015] In some embodiments, the number of the flash cutting knives provided is 2 - 5, and they are arranged at equal intervals. Beneficial effects

[0016] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0017] (1) The present utility model adopts the design that the maximum length of the flash cutting knife body extending from the front end to the rear end is less than one-third of the circumference of the shoulder, so that there will be no spiral extending cutting knife body and chip removal groove formed on the stirring head. Therefore, for the scenarios that require long-time welding and flash cutting, the entanglement and adhesion of the flash are reduced or even eliminated, the sustainable working duration and cutting quality are improved; at the same time, the processing and manufacturing difficulty of the stirring head is also greatly reduced, and the manufacturing cost is reduced.

[0018] (2) The present utility model adopts the design that the minimum vertical distance from the flash cutting knife body to the end face of the shoulder is greater than 0, which not only avoids the phenomenon that the cut flash is stuck between the flash cutting knife body and the welded part, but also enables better control of the thinning amount of the weld surface during cutting. Brief description of the drawings

[0019] Figure 1 A three-dimensional view of a welding and milling integrated stirring head provided for the embodiment;

[0020] Figure 2 A partially enlarged view of a welding and milling integrated stirring head provided for the embodiment;

[0021] Figure 3 Another partially enlarged view of a welding and milling integrated stirring head provided for the embodiment;

[0022] Figure 4 Another partially enlarged view of a welding and milling integrated stirring head provided for the embodiment;

[0023] Figure 5 A bottom view of a welding and milling integrated stirring head provided for the embodiment;

[0024] Figure 6 A three-dimensional view of a welding and milling integrated stirring head with 2 flash cutting knives provided for the embodiment;

[0025] Figure 7A three-dimensional view of a welding and milling integrated stirring head with three flash cutting tools provided for the embodiment;

[0026] Figure 8 A three-dimensional view of a welding and milling integrated stirring head with four flash cutting tools provided for the embodiment;

[0027] Figure 9 A three-dimensional view of a welding and milling integrated stirring head with five flash cutting tools provided for the embodiment;

[0028] Explanation of the reference numerals in the schematic diagram:

[0029] 1. Clamping part; 2. Stirring head main body part; 21. Anti-slip groove; 3. Shoulder; 31. Shoulder groove structure; 4. Stirring pin; 41. Stirring pin thread; 42. Stirring pin cutting edge; 5. Flash cutting tool; 51. Main cutting edge; 52. Flash cutting tool main body; 53. First tool face; 54. Second tool face; 55. Sub cutting edge. Specific implementation manner

[0030] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0031] Please refer to Figures 1-9 , the welding and milling integrated stirring head provided in this embodiment includes a clamping part 1, a stirring head main body part 2, a shoulder 3, and a stirring pin 4 connected in sequence. A flash cutting tool 5 is arranged on the part of the stirring head main body part 2 close to the shoulder 3. The flash cutting tool 5 includes a main cutting edge 51 and a flash cutting tool main body 52; the minimum vertical distance H from the flash cutting tool main body 52 to the end face of the shoulder 3 is greater than 0, that is, as Figure 2 shown, H>0; this not only avoids the phenomenon that the cut flash is stuck between the flash cutting tool main body and the welded part, but also makes it easier to control the thinning amount of the weld surface during cutting.

[0032] The maximum length L of the flash cutting tool main body 52 extending from the front end to the rear end is less than one-third of the circumference of the shoulder 3, that is, as Figure 3It is shown that L < πD / 3. The maximum width and maximum thickness of the flash cutting tool body 52 are both smaller than the maximum length of the flash cutting tool body 52 extending from the front end to the rear end. After a large number of experiments verified by the inventor, defining the above size relationship between the maximum length L of the flash cutting tool body 52 extending from the front end to the rear end and the circumference of the shoulder 3 will not cause a helically extending cutting tool body and chip evacuation groove to be formed on the stirring head. Therefore, for scenarios that require long-term welding and flash cutting, the entanglement and adhesion of the flash are reduced or even eliminated, improving the sustainable working duration and cutting quality. At the same time, it also greatly reduces the processing and manufacturing difficulty of the stirring head and reduces the manufacturing cost.

[0033] During the friction stir welding process of the welding and milling integrated stirring head provided in this embodiment, first, the base metal is stirred and broken by the high-speed rotation of the stirring pin 4, and then the base metal is continuously subjected to forging pressure and rotational friction by the high-speed rotation of the shoulder 3. During the welding process, a weld seam is formed under the synchronous forging and stirring action of the shoulder 3 and the stirring pin 4. During this process, welding flash is generated, and the high-speed rotating flash cutting tool 5 cuts the generated flash in real time, and at the same time, the flash is thrown away and discharged. Since there is a certain gap between the flash cutting tool body 52 of this application and the end face of the shoulder 3, and there are no structures such as a helically extending cutting tool body and chip evacuation groove that are likely to block and entangle the flash in this application, therefore, even if welding and cutting are carried out for a long time, the flash will be discharged in time, and the situation of adhesion or entanglement of the flash due to the gradual accumulation of heat and temperature rise of the cutting tool will not occur.

[0034] In some preferred embodiments, the flash cutting tool 5 further includes a first cutting surface 53 and a second cutting surface 54. The first cutting surface 53 and the second cutting surface 54 intersect to form a secondary cutting edge 55, and the length of the secondary cutting edge 55 is smaller than the length of the main cutting edge 51, which is more conducive to the removed flash breaking away.

[0035] In some preferred embodiments, the minimum vertical distance from the flash cutting tool body 52 to the end face of the shoulder 3 is not less than 0.1 mm. Further preferably, the minimum vertical distance from the flash cutting tool body 52 to the end face of the shoulder 3 is greater than 0.1 mm and less than 0.6 mm.

[0036] In some preferred embodiments, the maximum length of the flash cutting tool body 52 extending from the front end to the rear end is less than one-fifth of the circumference of the shoulder 3.

[0037] In some preferred embodiments, the stirring head main body portion 2 is provided with anti-slip grooves 21. Thus, it can prevent slipping when disassembling and assembling the tool, which is more conducive to safety.

[0038] In some preferred embodiments, at least one layer of hard coating is provided on the surface of the shoulder 3, the surface of the stirring pin 4, the surface of the flash cutting tool 5, and the surface of the part of the main body 2 of the stirring head close to the shoulder 3. The hard coating can be obtained by surface treatment methods such as PVD and CVD.

[0039] In some preferred embodiments, the hard coating includes at least one of TiN coating, TiC coating, Al2O3 coating, diamond coating, TiAlSi coating, and TiAlN coating. The number of the above coatings can be single-layer, double-layer, triple-layer or multi-layer, so as to effectively prevent the "aluminum sticking phenomenon" during the milling process.

[0040] In some preferred embodiments, the number of the flash cutting tools 5 provided is greater than 1. The arrangement of multiple flash cutting tools 5 can not only improve the cleanliness of flash removal, but also avoid the influence on flash cutting when a single cutting edge is damaged, and reduce the working temperature of the flash cutting tool. Further preferably, the number of the flash cutting tools 5 provided is 2 - 5, and they are arranged at equal intervals.

[0041] In some embodiments, a shoulder groove structure is provided on the shoulder, and the shoulder groove structure (31) is one of a concentric ring structure, an Archimedean spiral structure, and a conical surface groove structure.

[0042] In some embodiments, a stirring pin thread and at least one stirring pin cutting edge 42 are provided on the side surface of the stirring pin. Through the design of the concentric ring structure, the Archimedean spiral structure, and the conical surface groove structure, the plastic flow of the weld metal during the welding process can be improved, and the generation of weld root defects can be avoided.

[0043] In some embodiments, more than 3 stirring pin cutting edges are provided on the side surface of the stirring pin.

[0044] In some preferred embodiments, a clamping plane is provided on the clamping part 1, so as to increase the clamping contact area and improve the clamping stability.

[0045] The above embodiments only represent certain embodiments of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention; therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A welding and milling integrated stirring head, which comprises a clamping part (1), a stirring head main body part (2), a shoulder (3), and a stirring pin (4) connected in sequence. It is characterized in that: A flash cutting tool (5) is arranged on the part of the stirring head main body part (2) close to the shoulder (3). The flash cutting tool (5) includes a main cutting edge (51) and a flash cutting tool main body (52); The minimum vertical distance from the flash cutting tool main body (52) to the end face of the shoulder (3) is greater than 0; The maximum length of the flash cutting tool main body (52) extending from the front end to the rear end is less than one-third of the circumference of the shoulder (3); the maximum width and maximum thickness of the flash cutting tool main body (52) are both less than the maximum length of the flash cutting tool main body (52) extending from the front end to the rear end.

2. The integrated welding and milling stirring head according to claim 1, characterized in that: The flash cutting tool (5) further includes a first tool face (53) and a second tool face (54); the first tool face (53) and the second tool face (54) intersect to form a secondary cutting edge (55), and the length of the secondary cutting edge (55) is less than the length of the main cutting edge (51).

3. The welding and milling integrated stirring head according to claim 2, wherein: The minimum vertical distance from the flash cutting tool main body (52) to the end face of the shoulder (3) is not less than 0.1 mm.

4. The integrated welding and milling stirring head according to claim 3, wherein: The maximum length of the flash cutting tool main body (52) extending from the front end to the rear end is less than one-fifth of the circumference of the shoulder (3).

5. The integrated welding and milling stirring head according to claim 4, characterized in that: The stirring head main body part (2) is provided with an anti-slip groove (21).

6. The welding and milling integrated stirring head according to claim 5, characterized in that: At least one layer of hard coating is provided on the surface of the shoulder (3), the surface of the stirring pin (4), the surface of the flash cutting tool (5), and the surface of the part of the stirring head main body part (2) close to the shoulder (3).

7. The combined welding and milling stirring head according to claim 6, wherein: The hard coating includes at least one of a TiN coating, a TiC coating, an Al2O3 coating, a diamond coating, a TiAlSi coating, and a TiAlN coating.

8. The integrated welding and milling stirring head according to any one of claims 1-7, characterized in that: The number of the flash cutting tools (5) arranged is more than 1.

9. The integrated welding and milling stirring head according to claim 8, characterized in that: A shoulder groove structure (31) is arranged on the shoulder (3), and the shoulder groove structure (31) is one of a concentric ring structure, an Archimedes spiral structure, and a conical surface groove structure.

10. The integrated welding and milling stirring head according to claim 9, characterized in that: A stirring pin thread (41) and at least one stirring pin cutting edge (42) are arranged on the side surface of the stirring pin (4).

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