A double-headed friction stir welding head

Abstract

This utility model discloses a double-headed friction stir welding head, including a connector, with a first stirring head body and a second stirring head body symmetrically arranged at both ends of the connector. Each of the first and second stirring head bodies includes a coaxially arranged stirring pin and a transition portion. One end of the transition portion is fixedly connected to the connector, and the other end has a shoulder end face, to which the stirring pin is fixedly connected. This utility model employs a double-headed design, reducing the investment cost associated with replacing stirring heads.

Description

Technical Field

[0001] This utility model relates to the field of friction welding technology, and in particular to a double-headed stirring head for friction welding. Background Technology

[0002] Friction stir welding is a novel and promising welding method. This method utilizes a high-speed rotating stirring head that penetrates the workpiece. Frictional heat is generated at the contact point between the stirring head and the workpiece. Once a plastic softening layer forms around the workpiece, the metal begins to move along the welding direction. During the welding process, the plasticized metal fills the cavity formed behind the stirring needle under the rotation of the stirring head, and a dense weld is forged under the stirring of the stirring head shoulder and the stirring needle, as well as the pressure at the tip.

[0003] When using friction stir welding, the stirring head must withstand high temperatures, enormous mechanical stress, and intense friction and wear. These complex and harsh working conditions can easily cause the stirring head to wear, deform, or even break. In actual industrial production, frequent replacement of worn or damaged stirring heads increases purchase costs and raises equipment investment costs. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a double-headed friction stir welding head to reduce the investment cost of replacing the stirring head.

[0005] The present invention provides a double-head friction stir welding head, characterized in that it includes a connector, and a first stirring head body and a second stirring head body are symmetrically arranged at both ends of the connector.

[0006] Both the first stirring head body and the second stirring head body include a stirring pin and a transition portion arranged coaxially. One end of the transition portion is fixedly connected to the connector, and the other end is provided with a shoulder end face. The stirring pin is fixedly connected to the shoulder end face.

[0007] Furthermore, the connector includes a first connecting portion and a second connecting portion coaxially arranged, the first connecting portion being coaxially and fixedly connected to the transition portion of the first stirring head body, and the second connecting portion being coaxially and fixedly connected to the transition portion of the second stirring head body.

[0008] Furthermore, a limiting plate is fixedly connected between the first connecting part and the second connecting part. The first connecting part, the second connecting part, and the limiting plate are all cylindrical, and the diameters of the first connecting part and the second connecting part are smaller than the diameter of the limiting plate.

[0009] Furthermore, both the first connecting portion and the second connecting portion are provided with positioning surfaces along their length direction.

[0010] Furthermore, the transition portion is a frustum, the first end face of the transition portion is set as the shoulder end face, the second end face of the transition portion is connected to the first connecting portion or the second connecting portion, and the diameter of the second end face of the transition portion is greater than the diameter of the first end face and less than or equal to the diameter of the first connecting portion or the second connecting portion connected to it.

[0011] Furthermore, a double annular groove is concentrically formed on the shoulder end face around the stirring needle.

[0012] Furthermore, a spiral groove is concentrically formed around the stirring needle on the shoulder end face. Compared to the prior art, the beneficial effects of this utility model are:

[0013] This utility model discloses a friction stir welding head with symmetrically arranged first and second stirring head bodies. During installation, the first stirring head body is positioned downwards, and the connector is then installed on the tool holder of the friction stir welding machine to fix the stirring head in place. The downward-facing first stirring head body is used to perform welding work on the workpiece. When the first stirring head body in use shows wear or a broken needle, the unused second stirring head body is flipped over and installed with the second stirring head body facing downwards, allowing the stirring head to continue to be used for welding work. The stirring head of this application extends the service life of the stirring head, avoids frequent replacement of the stirring head, and reduces the investment cost caused by frequent replacement of the stirring head.

[0014] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] The diagram shows: 1. Connector; 2. First stirring head body; 3. Second stirring head body; 4. Limiting plate;

[0018] 11. First connecting part; 12. Second connecting part;

[0019] 21. Stirring needle; 22. Transition section; 23. Shoulder end face;

[0020] 111. Positioning surface. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0022] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Please refer to Figure 1 The present invention provides a double-head friction stir welding head, including a connector 1, with a first stirring head body 2 and a second stirring head body 3 symmetrically arranged at both ends of the connector 1;

[0024] Both the first stirring head body 2 and the second stirring head body 3 include a stirring needle 21 and a transition part 22 arranged coaxially. One end of the transition part 22 is fixedly connected to the connector 1, and the other end is provided with a shoulder end face 23. The stirring needle 21 is fixedly connected to the shoulder end face 23.

[0025] In this embodiment, the connector 1 is used to be fixed on the tool holder of the friction welding machine. During installation, the first stirring head body 2 or the second stirring head body 3 is selected as the processing stirring head, and the first stirring head body 2 or the second stirring head body 3 is set downward. The connector 1 is installed in the tool holder of the friction welding machine, and then the connector 1 is fixed by fasteners to realize the installation and fixation of the stirring head. The fasteners can be set screws, which are used to lock the connector 1. Other fastening methods that can achieve fixation can also be used, which are not limited here.

[0026] The outer wall of the stirring pin 21 can be set to a smooth curved surface or a thread according to the actual welding requirements. The shoulder end face 23 is used to directly contact the aluminum alloy plate or other metal plate to be welded, and the axis of the stirring pin 21 is perpendicular to the shoulder end face 23. During welding, the robotic arm of the friction welding machine applies a corresponding force to the fixed stirring head, so that the corresponding stirring pin 21 is inserted between the two workpieces. The shoulder end face 23 contacts the upper surface of the workpiece. The robotic arm of the machine drives the fixed stirring head to rotate and move according to the set program to realize the welding work of the workpiece.

[0027] When the first stirring head body 2 or the second stirring head body 3 in use shows wear or broken needles, the unused end of the first stirring head body 2 or the second stirring head body 3 can be flipped over and reinstalled, and the stirring head can continue to be used for welding work, avoiding the need to replace the stirring head with a new one. The stirring head of this application is equipped with stirring needles at both ends, which extends the service life of the stirring head, avoids frequent replacement of the stirring head, and reduces the investment cost caused by frequent replacement of the stirring head.

[0028] Preferred, such as Figure 1 As shown, the connector 1 includes a first connecting part 11 and a second connecting part 12 arranged coaxially. The first connecting part 11 is coaxial with and fixedly connected to the transition part 22 of the first stirring head body 2, and the second connecting part 12 is coaxial with and fixedly connected to the transition part 22 of the second stirring head body 3.

[0029] In this embodiment, the first connecting part 11 and the second connecting part 12 of this application can be connected by welding or integrally formed.

[0030] The first connecting part 11, the second connecting part 12, the first stirring head body 2, and the second stirring head body 3 are all coaxially arranged. When the first stirring head body 2 is used for welding, the first connecting part 11 is inserted into the tool holder of the friction welding machine and fixed. The first connecting part 11 and the first stirring head body 2 rotate around the same center to perform welding. When the second stirring head body 3 is used for welding, the second connecting part 12 is inserted into the tool holder of the friction welding machine and fixed. The second connecting part 12 and the second stirring head body 3 rotate around the same center to perform welding.

[0031] Preferably, a limiting plate 4 is fixedly connected between the first connecting part 11 and the second connecting part 12. The first connecting part 11, the second connecting part 12 and the limiting plate 4 are all cylindrical, and the diameters of the first connecting part 11 and the second connecting part 12 are both smaller than the diameter of the limiting plate 4.

[0032] In this embodiment, both the first connecting part 11 and the second connecting part 12 are provided with a Φ20*35mm cylinder, and the limiting plate 4 is provided with a Φ30*5mm cylinder. When the first connecting part 11 or the second connecting part 12 is inserted into the tool holder, the limiting plate 4 is in contact with the top surface of the tool holder. The limiting plate 4 is used to limit the height of the first connecting part 11 or the second connecting part 12 inserted into the tool holder.

[0033] Preferably, both the first connecting part 11 and the second connecting part 12 are provided with positioning surfaces 111 along their length direction. Specifically, both the first connecting part 11 and the second connecting part 12 are milled with positioning surfaces 111 to a depth of 1 mm. The positioning surfaces 111 are planar structures, and the tool holder is a cylindrical structure with a planar structure inside that matches the positioning surfaces 111. By providing the positioning surfaces 111, it is easier to install the first connecting part 11 or the second connecting part 12 into the tool holder of the friction welding machine, saving other positioning workpieces.

[0034] Preferably, the transition portion 22 is a frustum, the first end face of the transition portion 22 is set as a shoulder end face 23, the second end face of the transition portion 22 is connected to the first connecting portion 11 or the second connecting portion 12, and the diameter of the second end face of the transition portion 22 is greater than the diameter of the first end face and less than or equal to the diameter of the first connecting portion 11 or the second connecting portion 12 connected to it.

[0035] In this embodiment, the transition portion 22 enables the shoulder end face 23 to transitionally connect with the first connecting portion 11 or the second connecting portion 12. The transition portion 22 is a frustum. The symmetry and streamlined design of the frustum reduces the lateral force when the first stirring head body 2 or the second stirring head body 3 rotates, thereby making the stirring needle 21 rotate more smoothly and avoiding interference with the welded product.

[0036] Preferably, a double annular groove is concentrically formed on the shoulder end face 23 around the stirring pin 21. Preferably, a spiral groove is concentrically formed on the shoulder end face 23 around the stirring pin.

[0037] Specifically, double annular grooves or spiral grooves can be opened on the shoulder end face 23 according to the actual welding requirements. The spiral grooves can be adjusted according to different materials and thicknesses of the workpiece to adapt to the welding requirements.

[0038] When the stirring head rotates and moves, the double annular groove or vortex groove can make the solder generated during stirring and friction flow in an orderly manner within the double annular groove or vortex groove, avoiding disorderly accumulation of solder, making the weld more uniform and smooth, and reducing burrs and flash.

[0039] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A double-headed friction stir welding head, characterized in that, Includes a connector, with a first stirring head body and a second stirring head body symmetrically arranged at both ends of the connector; Both the first stirring head body and the second stirring head body include a stirring pin and a transition portion arranged coaxially. One end of the transition portion is fixedly connected to the connector, and the other end is provided with a shoulder end face. The stirring pin is fixedly connected to the shoulder end face.

2. The double-headed friction stir welding head according to claim 1, characterized in that, The connector includes a first connecting part and a second connecting part arranged coaxially. The first connecting part is coaxially and fixedly connected to the transition part of the first stirring head body, and the second connecting part is coaxially and fixedly connected to the transition part of the second stirring head body.

3. The double-headed friction stir welding head according to claim 2, characterized in that, A limiting plate is fixedly connected between the first connecting part and the second connecting part. The first connecting part, the second connecting part and the limiting plate are all cylindrical, and the diameters of the first connecting part and the second connecting part are smaller than the diameter of the limiting plate.

4. A double-headed friction stir welding head according to claim 3, characterized in that, Both the first connecting part and the second connecting part have positioning surfaces along their length direction.

5. A double-headed friction stir welding head according to claim 3, characterized in that, The transition portion is a frustum, the first end face of the transition portion is set as the shoulder end face, the second end face of the transition portion is connected to the first connecting portion or the second connecting portion, and the diameter of the second end face of the transition portion is greater than the diameter of the first end face and less than or equal to the diameter of the first connecting portion or the second connecting portion connected to it.

6. A double-headed friction stir welding head according to claim 1, characterized in that, The shoulder end face is provided with a double annular groove concentrically formed around the stirring needle.

7. A double-headed friction stir welding head according to claim 1, characterized in that, A spiral groove is concentrically formed around the stirring needle on the shoulder end face.

Images