A double-shaft shoulder stirring head with automatic gap adjustment

Abstract

The invention discloses a double-shaft-shoulder stirring head with an automatically-adjusted clearance. The double-shaft-shoulder stirring head with the automatically-adjusted clearance is composed of a stirring head body, an upper shaft shoulder, a stirring needle, a lower shaft shoulder, a spring, a bearing and a bottom disc. The stirring head body is connected with power equipment. The stirring needle is fixedly connected with the lower end of the stirring head body through the upper shaft shoulder. According to the double-shaft-shoulder stirring head with the automatically-adjusted clearance, the upper shaft shoulder is rotated while the lower shaft shoulder is not rotated, the clearance between the upper shaft shoulder and the lower shaft shoulder is adjusted automatically, and therefore heat input generated by friction of the shaft shoulders and base materials is reduced, the mechanical property of welding seams is improved, and the situation that a large number of flashes and burrs are generated in the welding process due to the too large clamping force of a double-shaft-shoulder stirring head of a traditional structure is avoided. The overall quality of an assembled vehicle is improved, work hours consumed by repairing of welding defects are greatly reduced, and therefore manufacturing cost is reduced, and great significance to high-speed rails for going abroad and marching towards the world is achieved.

Description

technical field [0001] The invention relates to the structural design and application of a stirring head in the field of welding, and in particular provides a double-shaft shoulder stirring head with automatic gap adjustment. Background technique [0002] In recent years, with the introduction of high-speed rail technology, my country has become one of the few countries in the world that can design and produce high-speed rail passenger cars by itself, and the share of world high-speed rail orders has been raised to the national level. It is a prerequisite for whether countries can win orders in the competition between countries. [0003] Due to the relatively conservative domestic manufacturing technology at present, most of the long and straight welds of the high-speed rail car body are still welded by traditional MIG welding, and small parts are welded by friction stir welding. There is a lot of room for improvement in the mechanical properties of the joints. Compared wit...

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Problems solved by technology

For the welding of aluminum alloy profiles in high-speed rail carriages, the single-shouldered stirring head cannot meet the requirements of the manufacturing process. For this type of material welding, only double-shouldered stirring heads can be used.

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