A friction stir welding tool

Abstract

The application provides a friction stir welding head, comprising a shaft body which is cylindrical, the shaft body having a welding end, the welding end being provided with at least three positioning surfaces, including a first positioning surface, a second positioning surface and a third positioning surface, the three positioning surfaces being parallel to each other and perpendicular to a center line L of the shaft body, the maximum distance between the first positioning surface and the center line L being greater than the maximum distance between the second positioning surface and the center line L, the maximum distance between the second positioning surface and the center line L being greater than the maximum distance between the third positioning surface and the center line L, the second positioning surface and the third positioning surface being connected through a rotary body, the side surface of the rotary body being uniformly provided with at least three identical rotary surfaces, and the side surface of the rotary body being provided with a spiral groove. The application has the advantages of simple structure, high strength and good durability, can well position the product during welding, and improves the welding yield.

Description

[Technical Field]

[0001] This invention relates to the field of product welding technology, and in particular to a friction stir welding head. [Background Technology]

[0002] Friction stir welding is a mechanized solid-state joining method. Its working principle involves the high-speed rotating welding head generating heat through friction with the workpiece, causing localized melting of the materials to be welded. As the welding head moves forward along the welding interface, the plasticized material flows from the front to the rear of the welding head under the rotational friction force, forming a dense solid-state weld and deformation under the pressure of the welding head. To address the welding of products with different shapes and depths and improve the welding effect, the shape and structure of the welding head are particularly important. How to design the structure of the welding head is a problem that urgently needs to be solved by those skilled in the art.

[0003] Patent document 1 discloses a method for manufacturing a liquid cooling jacket, which involves a rotary tool F1, which is mainly composed of a base shaft part F2, a base end side pin F3 and a front end side pin F4. The base shaft part is connected to the main shaft of the friction stirring device. The outer circumferential surface of the base end side pin F3 forms multiple stepped layer difference parts throughout the entire height direction. However, the structure of this rotary tool is relatively complex. In actual use, there is a problem that the layer difference parts are easy to wear, resulting in a decrease in welding effect.

[0004] In view of this, the present invention provides a friction stir welding head to solve the above problems.

[0005] Patent Document 1: Patent No.: 201880053294.0, Patentee: Japan Light Metals Co., Ltd., Authorization Announcement No.: CN 111050974B. [Summary of the Invention]

[0006] To address the challenges of welding products of varying shapes and depths, and to improve welding performance and weld head strength, this invention provides a friction stir welding head to solve the aforementioned problems.

[0007] The solution to the technical problem of this invention is: a friction stir welding head, comprising:

[0008] The shaft is cylindrical and has a welded end. The welded end has at least three positioning surfaces, including a first positioning surface, a second positioning surface, and a third positioning surface. The three positioning surfaces are parallel to each other and perpendicular to the center line L of the shaft. The maximum distance between the first positioning surface and the center line L of the shaft is greater than the maximum distance between the second positioning surface and the center line L of the shaft. The maximum distance between the second positioning surface and the center line L of the shaft is greater than the maximum distance between the third positioning surface and the center line L of the shaft. The second positioning surface and the third positioning surface are connected by a rotating body. At least three identical rotating surfaces are evenly distributed on the side of the rotating body, and the side of the rotating body is provided with a spiral groove.

[0009] Preferably, each of the rotating surfaces has an included angle Q with the second positioning surface, the included angle Q being 90 to 120°.

[0010] Preferably, the cross section of the rotating body along the plane containing the center line L of the shaft has an included angle P, wherein the included angle P is 0 to 45°.

[0011] Preferably, the spiral groove is an arc-shaped groove with a spiral angle of 7 to 9°, a depth of 0.2 to 0.4 mm, and a width of 0.2 to 0.5 mm. The spiral groove is used to disperse stress, enhance the strength and durability of the rotating body, and facilitate rotation.

[0012] Preferably, the second positioning surface is concave relative to the first positioning surface, and an annular reinforcing groove is provided between the first positioning surface and the second positioning surface. The reinforcing groove is a rounded chamfered groove, which is used to reduce stress concentration during welding and enhance the strength of the welded end.

[0013] Preferably, the welding end is connected to the shaft body via a connecting shoulder, which converges from the shaft body toward the welding end.

[0014] Preferably, the end of the shaft away from the welding end is a connecting end, which is used to install and connect with the drive end of the welding device. The connecting end is provided with a limiting surface and a limiting boss. The limiting surface is a straight surface, and the limiting boss is arranged around the shaft. The limiting surface and the limiting boss are used to install and limit the welding head.

[0015] Preferably, the welding head is made of an alloy material, including tool steel, high-temperature alloy, tungsten-based alloy, and tungsten carbide cemented carbide.

[0016] The beneficial effects of the present invention are that the friction stir welding head of the present invention has a simple structure, high strength and strong durability, and can accurately position the product to be welded during welding, thereby improving the welding yield. [Attached Image Description]

[0017] Figure 1 This is a schematic diagram of the structure of a friction stir welding head at a first angle in an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0019] Figure 3 This is a schematic diagram of the structure of a friction stir welding head at a second angle in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of a friction stir welding head at a third angle in an embodiment of the present invention.

[0021] Figure 5 yes Figure 4 Schematic diagram of the middle BB surface.

Detailed Implementation Methods

[0022] To further illustrate the technical means and effects of the present invention, the following detailed description is provided in conjunction with the embodiments of the present invention and their accompanying drawings.

[0023] This invention provides a friction stir welding head, comprising:

[0024] Shaft 10, which is cylindrical, has a connecting end 11 and a welding end 12 at both ends of the shaft 10. The connecting end 11 is used to be installed and connected to the driving end of the welding device. The driving end of the welding device is used to drive the welding head to rotate.

[0025] The welding end 12 is connected to the shaft 10 via a connecting shoulder 13. The connecting shoulder 13 converges from the shaft 10 toward the welding end 12. The welding end 12 has at least three positioning surfaces, including a first positioning surface 121, a second positioning surface 122, and a third positioning surface 123. The three positioning surfaces are parallel to each other and perpendicular to the center line L of the shaft. The positioning surfaces facilitate positioning and product processing. The maximum distance between the first positioning surface 121 and the center line L of the shaft 10 is greater than the maximum distance between the second positioning surface 122 and the center line L of the shaft 10. The maximum distance between the second positioning surface 122 and the center line L of the shaft 10 is greater than the maximum distance between the third positioning surface 123. The maximum distance between the second positioning surface 122 and the third positioning surface 123 and the center line L of the shaft 10, wherein the second positioning surface 122 and the third positioning surface 123 are connected by a rotating body 14. The rotating body 14 has at least three rotating surfaces 140 of the same size evenly distributed on its side. Each rotating surface 140 has an included angle Q with the second positioning surface 122. The included angle Q is 90° to 120°. The rotating surface 140 facilitates the rotation of the welding head and the generation of heat during welding. The rotating body 14 has an included angle P along the plane where the center line L of the shaft is located. The included angle P is 0° to 45°. The included angles Q and P help to improve the strength of the rotating body 14. The rotating body 14 has a spiral groove 141 on its side.

[0026] Wherein, the cross-section of the welding end 12 along the plane where the first positioning surface 121 is located and the cross-section along the plane where the second positioning surface 122 is located are both circular, and have the same center as the cross-section of the shaft 10. The second positioning surface 122 is concave relative to the first positioning surface 121. An annular reinforcing groove 124 is provided between the first positioning surface 121 and the second positioning surface 122. The reinforcing groove 124 is a rounded chamfered groove, which is used to reduce stress concentration of the welding end 12 during welding and enhance the strength of the welding end 12.

[0027] The spiral groove 141 is an arc-shaped groove with a spiral angle of 7 to 9°, a depth of 0.2 to 0.4 mm, and a width of 0.2 to 0.5 mm. The spiral groove 141 is used to disperse stress, enhance the strength and durability of the rotating body 14, and facilitate rotation.

[0028] The connecting end 11 is provided with a limiting surface 110 and a limiting boss 111. The limiting surface 110 is a straight surface, and the limiting boss 111 is arranged around the shaft 10. The limiting surface 110 and the limiting boss 111 are used to install and limit the welding head.

[0029] The welding head is made of a high-strength alloy material, including but not limited to one of tool steel, superalloys, tungsten-based alloys, and tungsten carbide.

[0030] Example 1

[0031] In this embodiment, a 2.5mm thick 6061 aluminum alloy sheet needs to be welded to a 6061 aluminum alloy die-cast part. The welding is performed using a friction stir welding device with the welding head specified in this embodiment. The welding head is made of tungsten carbide cemented carbide. The diameter of the welding end 12 along the plane of the first positioning surface 121 is 8.4mm, and the diameter along the plane of the second positioning surface 122 is 5.6mm. The height difference between the first positioning surface 121 and the second positioning surface 122 is 0.85mm. The height difference between the second and third positioning surfaces is 4.67 mm. The length of the intersection of each of the rotating surfaces 140 and the second positioning surface 122 is 2.9 mm. The included angle Q between each of the rotating surfaces 140 and the second positioning surface 122 is 105.5°. The included angle P of the cross section of the rotating body 14 along the plane containing the axis centerline L is 32°. The spiral angle of the spiral groove is 8°, the depth is 0.33 mm, and the width is 0.38 mm. The depth of the reinforcing groove is 0.4 mm and the width is 0.45 mm.

[0032] The welding process is as follows: First, the welding head connection end 11 is installed with the drive end of the welding device. The plate to be welded is placed on the die-cast part and the two are clamped and fixed using a clamp. Then, the welding head is moved to the aluminum alloy plate and welded along the position to be welded. During welding, the stirring speed of the welding head is 1800 r / min, the welding depth is 3 mm, the feed rate is 400 mm / min, the stirring pressure is 5.7 kN, and the stirring angle is 270°.

[0033] The beneficial effects of the present invention are that the friction stir welding head of the present invention has a simple structure, high strength and strong durability, and can accurately position the product to be welded during welding, thereby improving the welding yield.

[0034] It should be noted that the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A friction stir welding head, characterized in that, include: The shaft is cylindrical and has a welded end. The welded end has at least three positioning surfaces, including a first positioning surface, a second positioning surface, and a third positioning surface. The three positioning surfaces are parallel to each other and perpendicular to the center line L of the shaft. The maximum distance between the first positioning surface and the center line L of the shaft is greater than the maximum distance between the second positioning surface and the center line L of the shaft. The maximum distance between the second positioning surface and the center line L of the shaft is greater than the maximum distance between the third positioning surface and the center line L of the shaft. The second positioning surface and the third positioning surface are connected by a rotating body. At least three identical rotating surfaces are evenly distributed on the side of the rotating body, and the side of the rotating body is provided with a spiral groove.

2. The friction stir welding head as described in claim 1, characterized in that: Each of the rotating surfaces has an included angle Q with the second positioning surface, the included angle Q being 90 to 120°.

3. The friction stir welding head as described in claim 1, characterized in that: The cross section of the rotating body along the plane containing the center line L of the axis has an included angle P, wherein the included angle P is 0 to 45°.

4. The friction stir welding head as described in claim 1, characterized in that: The spiral groove is an arc-shaped groove with a spiral angle of 7 to 9°, a depth of 0.2 to 0.4 mm, and a width of 0.2 to 0.5 mm.

5. The friction stir welding head as described in claim 1, characterized in that: The second positioning surface is concave relative to the first positioning surface, and an annular reinforcing groove is provided between the first positioning surface and the second positioning surface. The reinforcing groove is a rounded chamfered groove.

6. The friction stir welding head as described in claim 1, characterized in that: The welding end is connected to the shaft body via a connecting shoulder, which converges from the shaft body toward the welding end.

7. The friction stir welding head as described in claim 1, characterized in that: The end of the shaft away from the welding end is the connecting end, which is used to install and connect with the drive end of the welding device. The connecting end is provided with a limiting surface and a limiting boss. The limiting surface is a straight surface, and the limiting boss is arranged around the shaft. The limiting surface and the limiting boss are used to install and limit the welding head.

8. The friction stir welding head as described in claim 1, characterized in that: The welding head is made of an alloy material, including tool steel, high-temperature alloy, tungsten-based alloy, and tungsten carbide cemented carbide.

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