Multi-shaft shoulder double telescopic friction stir welding stirring head

Abstract

The invention provides a multi-shaft shoulder double telescopic friction stir welding stirring head. The multi-shaft shoulder double telescopic friction stir welding stirring head comprises a knife handle and a knife head, the bottom surface of the knife handle forms a first axial and upward installation hole, and the bottom surface of the knife handle forms a first lower shaft shoulder. The knifehead comprises an upper knife head body and a lower knife head body, the top surface of the upper knife head body extends upwards and axially to form an upper stirring needle with the contractible diameter, the upper stirring needle is inserted and fixed into the first installation hole in a telescopic mode, and the top surface of the upper knife head body forms an upper shaft shoulder. The bottom surface of the upper knife head body forms a second axial and upward installation hole, and the bottom surface of the upper knife head body forms a second lower shaft shoulder. According to the multi-shaft shoulder double telescopic friction stir welding stirring head, basic metal with the thickness of a single layer can be welded once, basic metal with the thickness of double layers can furtherbe welded; and the distance between the corresponding shaft shoulders can be adjusted according to the difference of the thicknesses of the basic metal, the lengths of the stirring needles can further be adjusted according to the need to adapt to the thicknesses of the different basic metal, the welding quality is ensured, the stirring head is prevented from changing for multiple times, the operation is simpler and more convenient, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a multi-shoulder double-telescopic friction stir welding stirring head. Background technique [0002] The application of friction stir welding on aluminum alloy and magnesium alloy is more and more extensive. The existing friction stir welding technology can realize the welding thickness of aluminum alloy ranging from 1mm to 75mm. During the welding process, the high-speed rotating stirring needle penetrates into the butt joint of the workpiece, and the rotating stirring head and the shoulder of the stirring head rub against the workpiece to generate heat, which causes the material in front of the stirring head to undergo strong plastic deformation. With the movement of the stirring head, the highly plastically deformed material is gradually deposited behind the stirring head, thus forming a friction stir welding seam. Friction stir welding does not have high requi...

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Problems solved by technology

However, this not only lowers work efficiency; but also when the base metal of one layer of thickness is welded first, the base metal of another layer of thickness will also be deformed to the same degree, and then the base metal of another layer of thickness will be formed when welding The effect is poor; in addition, when welding the base metal with double thickness, it is also required that the thickness of the double layer is the same, if not, when welding the base metal with another thickness, it is necessary to replace the stirring machine Head, the operation is more cumbersome, affecting work efficiency

[0005] (2) The main difference between the above two stirring heads in use is that there is a difference in the thickness of the welding base metal. The stirring head with double-shaft shoulders has certain requirements for the thickness of the welding base metal, and the thickness of the base metal needs to be exactly equal to the biaxial If the distance between the shoulders does not match, you need to replace the mixing head with other specifications; and when the base metal is thin, the extrusion of the double-axis shoulder will cause the deformation of the base material and cause the quality of the weld to deteriorate, but it cannot Adjust the length of the stirring needle according to the thickness adaptability of the base material;

[0006] For a stirring head with a single shoulder and a single stirring needle, there is only one shoulder, and the welding quality is poor when welding a relatively thick base metal; at the same time, the length of the stirring pin cannot be adjusted adaptively for different base metal thicknesses. Only mixing heads of different specifications and sizes can be replaced, and the operation is complicated

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