Withdrawable double-shaft-shoulder stirring head

Abstract

The invention discloses a withdrawable double-shaft-shoulder stirring head. The withdrawable double-shaft-shoulder stirring head comprises a stirring-head upper shaft shoulder, a stirring-head lower shaft shoulder and a withdrawing stirring pin, the stirring-head upper shaft shoulder is connected with a stirring head sleeve through bolts which perpendicularly penetrate through the stirring head sleeve and are fixed to the stirring-head upper shaft shoulder, a stirring pin sleeve is installed in the stirring head sleeve, the withdrawing stirring pin fixed through a bolt is installed in the stirring pin sleeve, the other end of the withdrawing stirring pin and the stirring-head lower shaft shoulder are connected into a whole through threads, a bolt penetrates through the stirring-head lower shaft shoulder and is fixed to the withdrawing stirring pin, the withdrawing stirring pin is in clearance fit with the stirring-head upper shaft shoulder, and the diameter of an opening in the tail end of the stirring-head upper shaft shoulder is larger than the diameter of the stirring-head lower shaft shoulder. According to the withdrawable double-shaft-shoulder stirring head, the distance between the stirring-head upper shaft shoulder and the stirring-head lower shaft shoulder is adjustable, and the problems that the withdrawing stirring pin is broken, the stirring-head lower shaft shoulder falls off and tool setting is difficult in a welding process are solved.

Description

technical field [0001] The invention relates to a stirring device, in particular to a retractable double shaft shoulder stirring head. Background technique [0002] Friction stir welding is an invention patent proposed by the British Welding Institute in October 1991. As an advanced solid-phase joining technology, friction stir welding has been widely used in shipbuilding, aerospace, rail transit and other fields. Double-shoulder friction stir welding clamps the workpiece through the upper and lower shoulders, and the lower shoulder replaces the backing plate device of conventional friction stir welding. This shoulder structure makes the upsetting force of the upper and lower shoulders equal in opposite directions, and the resultant force on the entire workpiece in the direction perpendicular to the plate is zero, which improves the heat input of the back of the weld and can prevent and reduce defects on the back of the weld. [0003] The distance between the upper and low...

AI Technical Summary

Problems solved by technology

[0003] The distance between the upper and lower shoulders of the conventional double-shouldered stirring head is not adjustable, and the welding process is prone to serious problems such as "flash", broken stirring needle, falling off of the lower shoulder, and difficulty in "knife setting".

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