Friction stir welding device for lightweight aluminum alloy electric vehicle frame

Abstract

The utility model belongs to the technical field of friction stir welding tools, and particularly relates to a friction stir welding device for a light-weight aluminum alloy electric vehicle frame, which comprises a manipulator, a friction stir welding head and a follow-up pressing frame, the follow-up pressing frame comprises a connector and two to four elastic pressing feet, and the elastic pressing feet are arranged at the bottom of the connector. The friction stir welding head is connected to the center of the connector, and the manipulator is connected with the follow-up pressing frame. The elastic presser foot comprises an outer cylinder, a spring, a guide sleeve and a bull eye bearing, the top of the outer cylinder is connected with the connector through a bolt, the guide sleeve is arranged in the outer cylinder, the spring is arranged between the guide sleeve and the outer cylinder, and the bottom of the guide sleeve is connected with the bull eye bearing. Compared with the prior art, the friction stir welding head has the advantages that the follow-up pressing frame is installed on the friction stir welding head in a composite mode, after the welding head moves to a welding position, the follow-up pressing frame can press an electric vehicle frame, the follow-up pressing frame can synchronously move along with the welding head, and local deformation of the force exerting position is effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of friction stir welding tooling, and in particular relates to a friction stir welding device for a lightweight aluminum alloy electric vehicle frame. Background Art

[0002] Like conventional friction welding, friction stir welding utilizes the heat generated by friction between a high-speed rotating welding tool and the workpiece to partially melt the materials being welded. As the welding tool moves forward along the weld interface, the plasticized material flows from the front to the back of the tool under the influence of the tool's rotational friction, forming a dense solid-phase weld under the tool's compression. Friction stir welding technology is gaining increasing application, primarily in the field of lightweight metal structures such as aluminum and magnesium alloys, but is also seeing some development in the field of high-melting-point materials.

[0003] During welding, the workpiece is rigidly secured to a backing pad while the welding head rotates at high speed, moving relative to the workpiece along the joint. The protruding section of the welding head penetrates the material, rubbing and stirring it. Friction between the shoulder of the welding head and the workpiece surface generates heat, preventing the plastic material from overflowing and removing surface oxide films. Friction stir welding, used in welding electric vehicle frames, produces welds that are superior to those produced by other welding methods. It also eliminates the need for flux, reduces costs, reduces weight, and facilitates automated production. It is flexible and environmentally friendly, making it an advanced welding technology.

[0004] Chinese utility model patent application number 202322541849.7 discloses a welding positioning clamping tool for stir friction welding cold plate, including a support plate, a fixed plate is provided at the upper end of the support plate, and multiple fixed beams and compression beams are horizontally arranged at the upper end of the fixed plate. Multiple horizontal clamps are symmetrically arranged between the multiple fixed beams and compression beams, and multiple push-pull clamps are symmetrically provided on the outer sides of the multiple compression beams.

[0005] Chinese utility model patent application number 201820155850.2 discloses a stir friction welding positioning device for large plates, including a base, the base having a working platform, and a reference mechanism lower than the working platform is provided on one side of the working platform; a left vertical frame higher than the working platform is provided on the left side of the working platform, and a right vertical frame higher than the working platform is provided on the right side of the working platform, a left clamping mechanism is provided on the left vertical frame, and a right clamping mechanism is provided on the right vertical frame.

[0006] At present, the positioning and clamping of the stir friction welding cold plate is quite difficult. Since most electric vehicle frames are made of stamped plates, when they come into contact and rub with the welding head, conventional clamps and clamping mechanisms are limited by the size of the welding head and are far away from the welding point. The welding point will still produce warping and deformation, and there are technical problems such as unstable welding quality. Conventional positioning and clamping devices still cannot solve the problem of local deformation at the welding head's point of application. Utility Model Content

[0007] The purpose of the utility model is to provide a lightweight aluminum alloy electric vehicle frame friction stir welding device, to overcome the shortcomings of the existing technology, the friction stir welding head is compounded with a follower clamping frame, after the welding head moves to the welding position, the follower clamping frame can immediately clamp the electric vehicle frame, the follower clamping frame can move synchronously with the welding head, to prevent local deformation at the point of application, to improve the effect of friction stir welding, easy to operate, and meet the technical requirements of customers for friction stir welding of aluminum alloy electric vehicle frames.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A friction stir welding device for a lightweight aluminum alloy electric vehicle frame comprises a manipulator, a friction stir welding head and a follower pressing frame, wherein the follower pressing frame comprises a connector and elastic pressure feet, 2-4 elastic pressure feet are arranged at the bottom of the connector, the connector is centrally connected to the friction stir welding head, and the manipulator is connected to the follower pressing frame; the elastic pressure feet comprise an outer cylinder, a spring, a guide sleeve and a bull's eye bearing, the top of the outer cylinder is connected to the connector by a bolt, a guide sleeve is provided in the outer cylinder, a spring is provided between the guide sleeve and the outer cylinder, and the bottom of the guide sleeve is connected to the bull's eye bearing.

[0010] Furthermore, the robot is a Nako M-710iC / 70 six-degree-of-freedom articulated arm.

[0011] Furthermore, the friction stir welding head structure includes a high-speed servo motor and a stirring head connected to the end of the motor shaft.

[0012] Furthermore, the specification of the bull's eye bearing is KSM-12FL, with a load-bearing capacity of 30 kg.

[0013] Furthermore, the stirring head is a standard FSW friction welding stirring head.

[0014] Furthermore, the distance between two adjacent elastic pressure feet is 100-200 mm, and the elastic pressure feet are symmetrically arranged on both sides of the weld.

[0015] Furthermore, a cooling water pipe rack is provided on the connector, and the cooling water pipe is a flexible lathe universal bamboo tube.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1) A follow-up pressing frame is installed on the friction stir welding head. After the welding head moves to the welding position, the follow-up pressing frame can immediately press the electric frame, and the follow-up pressing frame can move synchronously with the welding head, effectively preventing local deformation at the focus point;

[0018] 2) The device can significantly improve the effect of friction stir welding at the connection of electric vehicle frames, is easy to operate, and can meet customers' technical requirements for friction stir welding of aluminum alloy electric vehicle frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the implementation state of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the friction stir welding head and the follower pressing frame in the embodiment of the present utility model.

[0021] In the figure: 1-manipulator, 2-friction stir welding head, 3-follow-up pressing frame, 4-connector, 5-elastic pressure foot, 6-outer cylinder, 7-spring, 8-guide sleeve, 9-bull's eye bearing, 10-bolt, 11-high-speed servo motor, 12-stirring head, 13-cooling water pipe rack, 14-aluminum alloy frame weldment. DETAILED DESCRIPTION

[0022] The technical solutions of the present invention will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0024] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but rather represents only selected embodiments of the present invention.

[0025] See Figure 1-2, is a schematic structural diagram of an embodiment of a friction stir welding device for a lightweight aluminum alloy electric vehicle frame according to the present invention, comprising a manipulator 1, a friction stir welding head 2, and a follower pressing frame 3. The follower pressing frame 3 comprises a connector 4 and elastic pressure feet 5. Four elastic pressure feet 5 are arranged at the bottom of the connector 4. The connector 4 is centrally connected to the friction stir welding head 2. The manipulator 1 is connected to the connector 4 on the follower pressing frame 3. The elastic pressure feet 5 comprise an outer tube 6, a spring 7, a guide sleeve 8, and a bull's eye bearing 9. The top of the outer tube 6 is connected to the connector 4 by a bolt 10. A guide sleeve 8 is provided inside the outer tube 6. A spring 7 is provided between the guide sleeve 8 and the outer tube 6. The bottom of the guide sleeve 8 is connected to the bull's eye bearing 9.

[0026] In the embodiment, the manipulator 1 is a Nako M-710iC / 70 six-degree-of-freedom articulated arm, which can adjust the posture and position of the friction stir welding head 2 according to the welding direction. The friction stir welding head 2 structure includes a high-speed servo motor 11 and a stirring head 12 connected to the end of the motor shaft. The stirring head is a standard FSW friction welding stirring head. The bull's eye bearing 9 is of KSM-12FL specification and has a load-bearing capacity of 30kg. The function of the bull's eye bearing 9 is to move synchronously with the stirring head 12 and to press the aluminum alloy frame weldment 14 to be welded at any time to prevent deformation and warping.

[0027] To achieve reliable compression, the spacing between adjacent elastic pressure feet 5 is 100-200mm, preferably 120-150mm, and the elastic pressure feet are symmetrically positioned on both sides of the weld. To cool the aluminum alloy frame weldment 14 during welding, a cooling water pipe rack 13 can be provided on the connector 4. Suitable cooling water pipes are flexible lathe universal bamboo tubes, which can be manually adjusted in the direction of cooling water outflow and fixed in any position.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A friction stir welding device for lightweight aluminum alloy electric vehicle frames, characterized in that: It includes a manipulator, a friction stir welding head and a follower pressing frame. The follower pressing frame includes a connector and elastic pressure feet. 2-4 elastic pressure feet are arranged at the bottom of the connector. The connector is centrally connected to the friction stir welding head. The manipulator is connected to the follower pressing frame. The elastic pressure foot includes an outer cylinder, a spring, a guide sleeve and a bull's eye bearing. The top of the outer cylinder is connected to the connector by a bolt. A guide sleeve is arranged in the outer cylinder. A spring is arranged between the guide sleeve and the outer cylinder. The bottom of the guide sleeve is connected to the bull's eye bearing.

2. The friction stir welding device for a lightweight aluminum alloy electric vehicle frame according to claim 1, characterized in that: The manipulator is the Nako M-710iC / 70 six-degree-of-freedom articulated arm.

3. The friction stir welding device for a lightweight aluminum alloy electric vehicle frame according to claim 1, characterized in that: The friction stir welding head structure includes a high-speed servo motor and a stirring head connected to the end of the motor shaft.

4. The friction stir welding device for a lightweight aluminum alloy electric vehicle frame according to claim 1, characterized in that: The specification of the bull's eye bearing is KSM-12FL, with a load-bearing capacity of 30 kg.

5. The friction stir welding device for a lightweight aluminum alloy electric vehicle frame according to claim 3, characterized in that: The stirring head is a standard FSW friction welding stirring head.

6. The friction stir welding device for a lightweight aluminum alloy electric vehicle frame according to claim 1, characterized in that: The distance between two adjacent elastic pressure feet is 100-200 mm, and the elastic pressure feet are symmetrically arranged on both sides of the weld.

7. The friction stir welding device for a lightweight aluminum alloy electric vehicle frame according to claim 1, characterized in that: A cooling water pipe rack is provided on the connector, and the cooling water pipe is a flexible lathe universal bamboo tube.

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