Wear-resistant composite friction stir welding head with built-in cooling channels

Abstract

The utility model relates to the field of friction stir welding, and disclose a built -in cooling channel's wear -resisting composite friction stir welding head, including the stir head main part, the terminal fixed mounting of stir head main part has the connecting shaft, the terminal fixed mounting of connecting shaft has the shaft shoulder, the terminal fixed mounting of shaft shoulder has the stirring needle, the inside installation of stirring needle has cooling assembly, cooling assembly includes the one cooling pipe of inside of stir head main part, connecting shaft and shaft shoulder being opened, the terminal of one cooling pipe is located inside the spiral cooling pipe of stirring needle, the terminal of spiral cooling pipe is located inside the recovery pipe of stirring needle, stir head main part, connecting shaft and shaft shoulder. The utility model discloses the spiral cooling pipe setting prolongs the cooling time of coolant, makes the cooling more fully, makes it not due to excessive heat damage the welding head itself and influences the weld quality.

Description

Technical Field

[0001] This utility model relates to the field of friction stir welding technology, specifically a wear-resistant composite friction stir welding head with built-in cooling channels. Background Technology

[0002] Friction stir welding involves a high-speed rotating stirring head inserting a stirring pin into the workpiece to be welded. Once the workpiece and the shoulder are in close contact, the stirring head moves relative to the workpiece along the welding direction. The intense friction between the stirring head and the workpiece causes the welding temperature to rise rapidly, and the metal in the weld zone becomes thermoplastic. Under the traction, stirring, and compression of the stirring pin and the shoulder, a dense and reliable weld is formed.

[0003] A search revealed a novel friction stir welding head structure (publication number CN213105060U). The welding head is an integral structure comprising an intermediate shaft and a coaxial connecting shaft extending upwards from its top surface. The outer wall of the connecting shaft is cut with a plane, and a helical line is provided on the lower outer circumference of the intermediate shaft. A coaxial transition shaft extends downwards from the bottom of the intermediate shaft, and a shoulder extends from the bottom of the transition shaft. A stirring pin is positioned at the center of the bottom of the shoulder. This welding head increases welding speed, thus improving production efficiency while ensuring weld quality and welding head lifespan. However, the friction stir welding process generates significant heat; excessive heat can damage the welding head and affect weld quality. Therefore, we provide a wear-resistant composite friction stir welding head with a built-in cooling channel. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] Given that the existing technology has the problem that the friction stir welding process generates a lot of heat, excessive heat can damage the welding head itself and affect the quality of the weld.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A wear-resistant composite friction stir welding head with built-in cooling channel includes a stirring head body, a connecting shaft fixedly installed at the end of the stirring head body, a shoulder fixedly installed at the end of the connecting shaft, a stirring pin fixedly installed at the end of the shoulder, and a cooling component installed inside the stirring pin. The cooling assembly includes a first cooling pipe located inside the stirring head body, connecting shaft, and shoulder. The end of the first cooling pipe is located inside the stirring needle and has a spiral cooling pipe. The end of the spiral cooling pipe is located inside the stirring needle, stirring head body, connecting shaft, and shoulder and has a recovery pipe.

[0007] As a further embodiment of this utility model: an auxiliary stirring component is installed on the lower end face of the shoulder, the auxiliary stirring component includes a double annular groove formed on the lower end face of the shoulder, and three cross-sections are evenly spaced on the outer circumferential wall of the stirring needle.

[0008] As a further improvement of this utility model: the outer circumferential wall of the stirring pin is provided with multiple parallel and spaced grooves, and the side of the stirring pin is provided with a friction surface.

[0009] As a further embodiment of this utility model: a protrusion is fixedly installed on the top of the stirring head body, and a fixing component is installed on the top of the protrusion. The fixing component includes a stirring sleeve that is detachably installed on the top of the protrusion.

[0010] As a further embodiment of this utility model: a groove is provided on the lower end face of the stirring sleeve, an upper stirring fixing block is fixedly installed on the top end of the stirring sleeve, and a lower stirring fixing block is fixedly installed on the bottom end of the stirring sleeve.

[0011] As a further embodiment of this utility model: the surface of the stirring sleeve is provided with an upper thread, the surface of the stirring sleeve is provided with a lower thread, and an adjustment and fixing block is installed on the surface threads of the upper thread and the lower thread.

[0012] As a further embodiment of this utility model: the adjusting fixing block has an adjusting fixing groove inside, the stirring sleeve has an adjusting limiting block movably installed inside, and the protrusion has an adjusting limiting groove on its surface.

[0013] As a further embodiment of this utility model: an adjustment plate is fixedly installed on the surface of the adjustment limiting block, and an adjustment spring is sleeved on the surface of the adjustment plate and the surface of the stirring sleeve outside the adjustment limiting block.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model extends the cooling time of the coolant by setting a spiral cooling pipe, making the cooling more thorough and preventing the welding head from being damaged by excessive heat and affecting the quality of the weld. The double ring groove and the groove on the stirring pin can prevent the overflow of plastic material and reduce welding loss. During the rotation of the stirring pin, the friction surface of the stirring pin generates heat on the part. The friction heat generated by the welding head and the metal and the vigorous stirring make the metal at the joint soften into a plastic state. Then, under the action of external force, they are forged together to form a high-quality weld.

[0015] 2. This utility model uses the adjustment and fixing groove inside the adjustment and fixing block to squeeze the adjustment and limiting block, so that the end of the adjustment and limiting block is fixed inside the adjustment and limiting groove opened on the surface of the protrusion, thereby completing the fixation of the stirring head body, improving the stability of the welding head during operation, and preventing the stirring head body from easily detaching from the stirring sleeve. Attached Figure Description

[0016] Figure 1 A schematic diagram of the surface structure of a wear-resistant composite friction stir welding head with built-in cooling channels; Figure 2 This is a schematic diagram of the internal structure of a wear-resistant composite friction stir welding head with a built-in cooling channel; Figure 3 A schematic diagram of the cooling assembly structure of a wear-resistant composite friction stir welding head with built-in cooling channels; Figure 4 A schematic diagram of the auxiliary stirring mechanism in a wear-resistant composite friction stir welding head with a built-in cooling channel. Figure 5 A schematic diagram of the fixing component structure of a wear-resistant composite friction stir welding head with built-in cooling channels; In the diagram: 1. Stirring head body; 2. Fixing assembly; 21. Stirring sleeve; 22. Upper fixing block for stirring; 23. Lower fixing block for stirring; 24. Adjusting fixing block; 25. Upper thread; 26. Lower thread; 27. Adjusting fixing groove; 28. Adjusting limit block; 29. ​​Adjusting limit groove; 210. Adjusting spring; 211. Adjusting plate; 212. Groove; 3. Protrusion; 4. Connecting shaft; 5. Shaft shoulder; 6. Stirring needle; 7. Auxiliary stirring assembly; 71. Double ring groove; 72. Cut surface; 73. Groove; 74. Friction surface; 8. Cooling assembly; 81. Cooling pipe No. 1; 82. Spiral cooling pipe; 83. Recovery pipe. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order 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.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments. Example 1

[0020] Please see Figures 1-4 This is the first embodiment of the present invention. This embodiment provides a wear-resistant composite friction stir welding head with a built-in cooling channel, including a stirring head body 1, and further including: a connecting shaft 4 fixedly installed at the end of the stirring head body 1, a shoulder 5 fixedly installed at the end of the connecting shaft 4, a stirring pin 6 fixedly installed at the end of the shoulder 5, and a cooling component 8 installed inside the stirring pin 6; The cooling assembly 8 includes a first cooling pipe 81 located inside the stirring head body 1, the connecting shaft 4, and the shoulder 5. The end of the first cooling pipe 81 is provided with a spiral cooling pipe 82 located inside the stirring needle 6. The end of the spiral cooling pipe 82 is provided with a recovery pipe 83 located inside the stirring needle 6, the stirring head body 1, the connecting shaft 4, and the shoulder 5.

[0021] Specifically, an auxiliary stirring assembly 7 is installed on the lower end face of the shoulder 5. The auxiliary stirring assembly 7 includes a double-ring groove 71 formed on the lower end face of the shoulder 5, and three evenly spaced cut surfaces 72 are formed on the outer circumferential wall of the stirring pin 6. The outer circumferential wall of the stirring pin 6 is provided with multiple parallel and spaced grooves 73, and a friction surface 74 is formed on the side of the stirring pin 6.

[0022] Furthermore, the double-ring groove 71, in conjunction with the groove 73 on the stirring pin 6, can prevent the overflow of plastic material and reduce welding losses. During the rotation of the stirring pin 6, the friction surface 74 of the stirring pin 6 generates heat through friction. The friction between the welding head and the metal generates heat and intense stirring, softening the metal at the joint into a plastic state. Then, under the action of external force, they are forged together to form a high-quality weld.

[0023] In use, rotating the stirring head body 1 drives the protrusion 3, connecting shaft 4, shaft shoulder 5, and stirring needle 6 to rotate. During rotation, the stirring needle 6 generates heat through friction on its friction surface 74. The friction between the welding head and the metal, along with the intense stirring, softens the metal at the joint into a plastic state. Then, under external force, they are forged together to form a high-quality weld. During the stirring process, the double-ring groove 71 on the shaft shoulder 5 and the groove 73 on the stirring needle 6 cooperate to prevent the plastic material from overflowing and reduce welding losses. During the friction stirring process, coolant is injected into the interior of the first cooling pipe 81. The coolant cools the welding head through the spiral cooling pipe 82 inside the connecting shaft 4, shaft shoulder 5, and stirring needle 6, preventing it from being damaged by excessive heat and affecting the weld quality. The heated coolant is discharged through the recovery pipe 83. The spiral cooling pipe 82 extends the cooling time of the coolant, making the cooling more thorough.

[0024] In summary, the spiral cooling pipe 82 extends the cooling time of the coolant, making the cooling more thorough and preventing damage to the welding head and weld quality due to excessive heat. The double-ring groove 71, in conjunction with the groove 73 on the stirring pin 6, prevents the overflow of plastic material and reduces welding losses. During the rotation of the stirring pin 6, friction heat is generated on the parts through the friction surface 74 of the stirring pin 6. The friction heat generated by the welding head and the metal, along with the vigorous stirring, softens the metal at the joint into a plastic state. Then, under the action of external force, they are forged together to form a high-quality weld. Example 2

[0025] Please see Figures 1-5 This is the second embodiment of the present utility model.

[0026] Specifically, a protrusion 3 is fixedly installed at the top of the stirring head body 1, and a fixing component 2 is installed at the top of the protrusion 3. The fixing component 2 includes a stirring sleeve 21 detachably installed at the top of the protrusion 3. A groove 212 is formed on the lower end face of the stirring sleeve 21. An upper stirring fixing block 22 is fixedly installed at the top of the stirring sleeve 21, and a lower stirring fixing block 23 is fixedly installed at the bottom of the stirring sleeve 21. An upper thread 25 and a lower thread 26 are formed on the surface of the stirring sleeve 21. An adjusting fixing block 24 is threaded onto the surfaces of the upper thread 25 and the lower thread 26. An adjusting fixing groove 27 is formed inside the adjusting fixing block 24. An adjusting limiting block 28 is movably installed inside the stirring sleeve 21, and an adjusting limiting groove 29 is formed on the surface of the protrusion 3. An adjusting plate 211 is fixedly installed on the surface of the adjusting limiting block 28. An adjusting spring 210 is sleeved on the surface of the adjusting plate 211 and the surface of the stirring sleeve 21 outside the adjusting limiting block 28.

[0027] Furthermore, the adjusting and fixing groove 27 inside the adjusting and fixing block 24 is used to press the adjusting and limiting block 28, so that the end of the adjusting and limiting block 28 is fixed inside the adjusting and limiting groove 29 opened on the surface of the protrusion 3, thereby completing the fixing of the stirring head body 1, improving the stability of the welding head during operation, and preventing the stirring head body 1 from easily detaching from the stirring sleeve 21.

[0028] In use, the protrusion 3 is installed into the groove 212 of the stirring sleeve 21, and the adjusting fixing block 24 is rotated. The adjusting fixing block 24 rotates along the upper thread 25 and the lower thread 26 on the surface of the stirring sleeve 21. During the rotation, the adjusting fixing groove 27 inside the adjusting fixing block 24 presses the adjusting limiting block 28, so that the adjusting spring 210 is compressed. The adjusting limiting block 28 moves towards the center with the adjusting plate 211, so that the end of the adjusting limiting block 28 is fixed inside the adjusting limiting groove 29 on the surface of the protrusion 3. The upper fixing block 22 and the lower fixing block 23 of the stirring are fixedly installed on the surface of the stirring sleeve 21, which fixes the adjusting fixing block 24 and prevents the adjusting fixing block 24 from dislodging.

[0029] In summary, by pressing the adjusting limit block 28 with the adjusting fixing groove 27 inside the adjusting fixing block 24, the end of the adjusting limit block 28 is fixed inside the adjusting limit groove 29 opened on the surface of the protrusion 3, thereby completing the fixation of the stirring head body 1, improving the stability of the welding head during operation, and preventing the stirring head body 1 from easily detaching from the stirring sleeve 21.

[0030] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0031] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0032] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

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