Combined friction stir welding mixing head aiming at different thicknesses of sheets

Abstract

The invention relates to a combined friction stir welding mixing head aiming at different thicknesses of sheets, which is characterized in that a center matrix is coaxially inserted into a sleeve; internal threads and external threads which are matched are respectively formed on a threaded connection column and a threaded connection hole; after the threaded connection column is in threaded fit with the threaded connection hole, a shaft shoulder of the center matrix is connected with a clamping body of the sleeve; and a matrix mixing needle is coaxially connected with a sleeve mixing needle. In the machining process, the center matrix is universal, and a series of sleeves with different dimensions and parameters only need to be machined, and a plurality of entire mixing heads are not required to be machined, so that the machining materials are saved. If the mixing head is abraded in the welding process, the sleeve is only required to be replaced, and the center matrix can be continuously used, so that the assembly and disassembly time of the mixing head is saved, and the welding efficiency is improved. Meanwhile, the center matrix and the sleeve can select dissimilar materials to adapt to the welding of various materials.

Description

technical field [0001] The invention relates to a combined friction stir welding stirring head for plates with different thicknesses, relates to the technical field of solid phase welding, and in particular to a design of a combined stirring head for friction stir welding with different plate thicknesses. Background technique [0002] Friction stir welding (FSW) is a new type of solid-phase joining technology, which has the advantages of good weld quality, small residual stress and residual deformation in the heat-affected zone, and low welding temperature (less than the melting point of the base metal). The friction stir welding method has been patented worldwide (WO93110935). FSW technology relies on the frictional heat generated by the high-speed rotating stirring head and the contact surface of the two weldments, so that the metal at the joint produces a plastic softening zone, and the metal in the plastic softening zone around the rotating stirring head is stirred and s...

AI Technical Summary

Problems solved by technology

[0004] During the welding process, the stirring head and the workpiece need to overcome a lot of resistance when moving relative to each other, so the wear of the stirring head is serious, and most of the stirring heads used at present are of integrated structure, and the whole stirring head needs to be replaced after wear , resulting in material waste and increased production costs

Moreover, when the integrated stirring head welds plates of different thicknesses or different materials, it needs to be disassembled and installed multiple times, and the alignment is repeated, resulting in slow welding speed and low production efficiency

And the design of the relevant split combined stirring head reported at present, mainly adopts two kinds of schemes: the one, in patent US006139985A and CN101559535, adopt the scheme that the stirring needle is separated from the shaft shoulder, which simplifies the reinstallation after the stirring needle is worn out. The manufacturing process reduces the processing and manufacturing cost, but due to the small diameter of the stirring pin, the connection between the stirring pin and the shoulder is prone to fracture and damage due to stress concentration during welding; the second is in the patent CN101559533, by The method of separation from the clamping section solves the problem of welding the samples of different thicknesses by the stirring head to a certain extent, but due to the high precision requirements for the cooperation between the working section and the clamping section, not only the processing requirements are high, but also it is easy to Causes a large assembly stress, and is not easy to use for a long time, will produce a large gap and affect the welding quality

[0005] According to the retrieval of relevant documents, there is no report yet involving a combined sleeve-type stirring head

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