Lightweight backfill-type friction stir spot welding device

Abstract

The invention discloses a lightweight backfill-type friction stir spot welding device, and relates to a friction stir welding device. The device comprises an outer shell, a stirring needle, a sleeve and a jacket; the outer shell is internally provided with a transmission lead screw, and the transmission lead screw is a hollow two-way lead screw, wherein the ratio of the screw pitch of the upper portion to the screw pitch of the lower portion is equal to the inverse ratio of the cross-sectional area of the sleeve to the cross-sectional area of the stirring needle; an upper nut of the transmission lead screw is connected with the sleeve through a sleeve cylinder, bearings, a first bearing frame and a sleeve rolling spline nut; a stirring needle shaft capable of freely sliding in the transmission lead screw up and down and cooperating with the sleeve rolling spline nut is installed on a lower nut of the transmission lead screw through a second bearing frame and the bearings, and the lowerend of the stirring needle shaft is connected with the stirring needle; the device is provided with a transmission shaft sleeve in spline connection with the upper end of the stirring needle shaft, afirst power source and a second power source are arranged, the first power source is connected with the transmission shaft sleeve, and the second power sources is connected with the transmission leadscrew. The device has the advantages of light structure, high system stability and welding precision, good effect and long service life.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, and specifically relates to a lightweight backfilling friction stir spot welding device with light structure, high system stability, high welding precision, good effect and long service life. Background technique [0002] As the society pays more and more attention to energy conservation and environmental protection, lightweight has become the development direction of modern transportation industries such as automobiles and motor vehicles, as well as industrial manufacturing fields such as aerospace. This makes the application of lightweight and high-strength materials such as aluminum alloys and magnesium alloys more and more widely concerned, but at the same time it also puts forward higher requirements for the connection technology of these materials. Due to its light weight and high strength, aluminum alloy is widely used in various industries, especially the automobile and avia...

AI Technical Summary

Problems solved by technology

The existing backfill friction stir spot welding device has disadvantages such as complex power transmission system, poor stability, easy deformation of the stirring needle and sleeve, poor spot welding effect, short service life, and large overall volume of the device.

[0004] In November 2013, the State Intellectual Property Office published an invention patent application titled: A backfill friction stir welding method and its device, application number: 201310347507.X, although the device realizes backfill friction stir spot welding function, but it still has the following defects: 1. The stirring needle drives the sleeve to rotate through the spline pair, and the inner layer drives the outer layer to rotate. The torque is large, the power requirement is high, and the energy efficiency is low; 2. The transmission mechanism is complex and bulky. It is easy to produce problems such as large moment of inertia, elastic deformation, backlash, movement lag, friction, vibration, noise and wear, and the overall stability is poor; 3. When working, the dynamic force point and resistance force of the stirring needle and the cuff moving up and down The points are not coaxial, there is side load, the stirring needle and the sleeve are deformed, the welding accuracy is low, the effect is poor, the stirring needle, the sleeve and the jacket are easy to wear due to deformation, and the service life is short

4. The system has three power sources, one is responsible for the rotation of the stirring needle and the cuff, and the other two power sources respectively drive the stirring needle and the cuff to move up and down. The structure is complex and wastes space. The lead screw is too long to drive and the stability is poor.

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