A quick-change friction stir welding keyhole repair tool and method

Abstract

The present invention relates to the technical field of stir friction welding, and discloses a quick-change stir friction welding keyhole repair tool and method, the tool comprising: a stirring head; a repair head, the repair head is designed with a disassembly groove, the repair head is designed with a mounting groove, and the repair head is designed with a cavity structure. The repair method comprises the following steps: sleeve the L-shaped mounting groove of the repair head on the mounting shaft of the stirring head; fill the friction welding keyhole with aluminum beads, the diameter of the aluminum beads is not less than the length of the stirring needle; after filling, start the equipment, the stirring head drives the repair head to rotate, press down, compact the filler, and complete the keyhole repair. The repair tool has the advantages of being compatible with existing stirring heads, simple operation, and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of friction stir welding, and in particular to a quick-change friction stir welding keyhole repair tool and method. Background Art

[0002] During the friction stir welding process, each weld will produce a welding keyhole with the same size as the stirring needle. The existence of the keyhole affects the appearance of the weld on the one hand, and the strength of the weld connection on the other hand, and needs to be repaired. The existing keyhole repair method is to use arc welding or friction stir welding to repair. Problems with existing repair methods:

[0003] The arc welding repair method is generally manual TIG welding, which fills the keyhole and then grinds the surface flat. This method is easy to operate and is a commonly used repair method in production. However, this method will increase the arc welding and grinding production processes, and the arc welding process cost is high. New welding defects such as burn-through and cracks may be generated during the arc welding process; the friction stir plug welding method is used. The existing method is generally to make a special needle-free repair stirring head, fill the keyhole, and use friction stir welding to weld the keyhole surface. This method has good joint repair performance, but the repair stirring head is not compatible with the welding stirring head. For example, if the same production station is used, the stirring head needs to be replaced for repair work, and the current welding equipment does not have the function of automatic replacement of the stirring head, and the production operation convenience is poor; if a special repair operation station is set up, the equipment investment will increase, and the process will increase. The operation convenience is poor in production, which affects the production rhythm. Summary of the invention

[0004] In view of the problems existing in the above commonly used repair methods, the present invention proposes a quick-change stir friction welding keyhole repair tool and method, which adopts the friction welding repair method and realizes the quick-change tool to complete stir friction welding and keyhole repair operations at the same workstation through the compatible design of the repair head and the welding stirring head, thereby improving production efficiency and ensuring the quality of the weld.

[0005] In order to achieve the above purpose and other purposes, the present invention is implemented by including the following technical solutions: The present invention proposes a quick-change stir friction welding keyhole repair tool and method, the tool comprising: a repair head, the repair head has a accommodating cavity, the outer side wall of the repair head has a disassembly groove and an installation groove, and the bottom end surface of the repair head is provided with a spiral groove; and a stirring head, the stirring head includes a stirring head body and mounting shafts located on both sides of the bottom of the stirring head body, the mounting shaft and the mounting groove are cooperatively connected, and the bottom of the stirring head body has a stirring needle.

[0006] In one embodiment, the end surface of the repair head is a concave structure.

[0007] In one embodiment, the spiral groove includes at least 3 spiral grooves.

[0008] In one embodiment, the stirring head body includes a shoulder, one end of the shoulder is connected to a stirring needle, and the other end of the shoulder is connected to a rotating shaft.

[0009] In one embodiment, the mounting groove is an L-shaped structure, wherein the horizontal direction of the bottom of the mounting groove is consistent with the rotation direction of the stirring head.

[0010] In one embodiment, the stirring head adopts a dynamic shoulder stirring head structure.

[0011] In one embodiment, the stirring head body and the mounting shaft are detachably connected, and the mounting shaft and the mounting groove are interference fit.

[0012] The repair method comprises: installing a repair head on a stirring head to form a repair tool; filling a filler into a friction welding keyhole; and rotating the repair tool to compact the filler to complete the repair.

[0013] Wherein, the repair tool comprises: a repair head, the repair head has a receiving cavity, the outer side wall of the repair head has a disassembly groove and an installation groove, and the bottom end surface of the repair head is provided with a spiral groove;

[0014] And a stirring head, the stirring head includes a stirring head body and mounting shafts located on both sides of the bottom of the stirring head body, the mounting shafts are cooperatively connected with the mounting grooves, and a stirring needle is provided at the bottom of the stirring head body.

[0015] In one embodiment, the rotation direction of the spiral groove is opposite to the rotation direction of the stirring head.

[0016] In one embodiment, the filler is aluminum beads, and the diameter of the aluminum beads is not less than the length of the stirring needle.

[0017] The present invention provides a quick-change friction stir welding keyhole repair tool and method. Compared with the prior art, the present invention has the following beneficial effects: adopting the friction welding repair method, through the compatible design of the repair head and the welding stirring head, the tool can be quickly changed on the same work station to complete the friction stir welding and keyhole repair operations, thereby improving production efficiency and ensuring the quality of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Shown is a product structure diagram of the quick-change friction stir welding keyhole repair tool of the present invention.

[0020] Figure 2 Shown is a schematic structural diagram of a repair head of a quick-change friction stir welding keyhole repair tool of the present invention.

[0021] Figure 3 Shown is a cross-sectional view of a repair head of a quick-change friction stir welding keyhole repair tool of the present invention.

[0022] Figure 4 Shown is a schematic diagram of the stirring head structure of the quick-change friction stir welding keyhole repair tool of the present invention.

[0023] Figure 5 Shown is a product assembly diagram of the quick-change friction stir welding keyhole repair tool of the present invention.

[0024] Figure 6 It is a working schematic diagram of the quick-change friction stir welding keyhole repair tool of the present invention.

[0025] In the figure: 1-repair head; 2-stirring head; 101-end face of repair head; 102-spiral groove; 103-disassembly groove; 104-installation groove; 105-accommodation cavity; 201-installation shaft; 202-stirring head body; 202a-stirring needle; 202b-shaft shoulder; 202c-rotating shaft; 3-aluminum bead; 4-keyhole. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] like Figure 1 and Figure 2 As shown, the present invention discloses a quick-change friction stir welding keyhole repair tool, the keyhole repair tool includes a repair head 1, the repair head 1 can be a cylindrical structure with a housing cavity 105, and an end face 101 of the repair head 1 has a spiral groove 102, and the spiral groove 102 can be a left-handed thread, which is opposite to the rotation direction of the stirring head 2. And the end face 101 of the repair head 1 is a concave structure. The repair head 1 has a quick-change function, and can be assembled and connected with the stirring head 2 by rotation. And the repair head 1 has good compatibility and is generally suitable for other stirring heads 2 on the market.

[0028] like Figure 2 and Figure 3 As shown, a disassembly groove 103 and an installation groove 104 are provided on the outer side wall of the repair head 1, the disassembly groove 103 may be close to the end face 101 where the spiral groove 102 is located, the installation groove 104 may be located at the top of the repair head 1, and the disassembly groove 103 and the installation groove 104 may be symmetrically arranged along the center line of the repair head 1. The shape of the installation groove 104 may be L-shaped, and specifically the installation groove 104 includes two installation grooves 104. The rotation direction of the spiral groove 102 is opposite to the rotation direction of the stirring head 2, so as to ensure that the welding material is concentrated inward.

[0029] like Figure 4 As shown, the keyhole repair tool includes a stirring head 2, and the stirring head 2 can be a design of a dynamic shoulder. The stirring head 2 includes a stirring head body 202 and a mounting shaft 201 arranged on the side wall of the stirring head body 202. The stirring head body 202 includes a stirring needle 202a, a shoulder 202b and a rotating shaft 202c. The stirring needle 202a is conical, and the mounting shaft 201 is detachably connected to the stirring head body 202. The mounting shaft 201 is symmetrically arranged on the side wall of the stirring head body 202. The bottom of the shoulder 202b has a stirring needle 202a, and the stirring needle 202a can have a thread. The mounting shaft 201 can be stuck in the mounting groove 104, and the part of the stirring head 2 below the mounting shaft 201 can be accommodated in the accommodating cavity 105 to avoid interference. The stirring head 2 needs to rotate in one direction, generally counterclockwise, so that the mounting shaft 201 can be stuck in the mounting groove 104 and will not fall off. Furthermore, the mounting groove 104 and the mounting shaft 201 are interference fit and can be self-locking, thereby ensuring the stability of the assembly connection between the mounting shaft 201 and the mounting groove 104 .

[0030] like Figure 5 and Figure 6 As shown, the present invention also provides a repair method, when the stirring head 2 is used to complete the friction stir welding, several keyholes are left on the workpiece. At the same workstation and on the same equipment, the repair head 1 can be quickly and manually installed by humans, that is, the L-shaped installation groove 104 of the repair head 1 is sleeved on the stirring head installation shaft 201; aluminum beads 3 are filled in the friction welding keyhole 4, and the diameter of the aluminum beads 3 is not less than the length of the stirring needle; after filling, the repair head 1 is rotated and clamped on the stirring head 2, and the equipment is started. The stirring head 2 drives the repair head 1 to rotate and press down the surface of the workpiece, and the pressing amount is 0.2 to 0.4 mm, and the duration is 5 to 10 seconds; after compacting the filler, lift the repair tool and continue to repair the next keyhole 4 until all keyholes 4 are repaired; finally, the repair head 1 is disassembled, and the repair of the keyhole 4 is completed.

[0031] In the description of the present invention, it should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "height", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0035] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0036] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A quick-change friction stir welding keyhole repair tool, characterized in that: The repair tool comprises: A repair head, wherein the repair head has a receiving cavity, a disassembly groove and an installation groove are provided on the outer side wall of the repair head, and a spiral groove is provided on the bottom end surface of the repair head; And a stirring head, the stirring head includes a stirring head body and mounting shafts located on both sides of the bottom of the stirring head body, the mounting shafts are cooperatively connected with the mounting grooves, and a stirring needle is provided at the bottom of the stirring head body.

2. The quick-change friction stir welding keyhole repair tool according to claim 1, characterized in that: The repair head end surface is a concave structure.

3. The quick-change friction stir welding keyhole repair tool according to claim 2, characterized in that: The spiral groove includes at least 3 spiral grooves.

4. The quick-change friction stir welding keyhole repair tool according to claim 1, characterized in that: The stirring head body comprises a shaft shoulder, one end of the shaft shoulder is connected to a stirring needle, and the other end of the shaft shoulder is connected to a rotating shaft.

5. The quick-change friction stir welding keyhole repair tool according to claim 1, characterized in that: The installation groove is an L-shaped structure, wherein the horizontal direction of the bottom of the installation groove is consistent with the rotation direction of the stirring head.

6. The quick-change friction stir welding keyhole repair tool according to claim 1, characterized in that: The stirring head adopts a dynamic shoulder stirring head structure.

7. The quick-change friction stir welding keyhole repair tool according to claim 1, characterized in that: The stirring head body and the mounting shaft are detachably connected, and the mounting shaft and the mounting groove are interference fit.

8. A method for repairing a quick-change friction stir welding keyhole, characterized in that: The repair method comprises the following steps: installing a repair head on a stirring head to form a repair tool; Fill the friction welding keyhole with filler; The repair tool rotates to compact the filler to complete the repair; Wherein, the repair tool comprises: a repair head, the repair head has a receiving cavity, the outer side wall of the repair head has a disassembly groove and an installation groove, and the bottom end surface of the repair head is provided with a spiral groove; And a stirring head, the stirring head includes a stirring head body and mounting shafts located on both sides of the bottom of the stirring head body, the mounting shafts are cooperatively connected with the mounting grooves, and a stirring needle is provided at the bottom of the stirring head body.

9. The repair method according to claim 8, characterized in that: The rotation direction of the spiral groove along the center is opposite to the rotation direction of the stirring head.

10. The repair method according to claim 8, characterized in that: The filler is aluminum beads, and the diameter of the aluminum beads is not less than the length of the stirring needle.

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