Equipment and method for double-sided friction stir processing ultra-fine grain plate

Abstract

A kind of equipment and method for double-sided friction stir processing of ultra-fine grained plates. The forward and reverse stirring heads with the same size and specifications are respectively located above and below the plate. During processing, the relative positions of the forward and reverse stirring heads are first determined. In the friction stir processing direction , the axial centerline distance L1 between the forward and reverse mixing heads is DS ~ 4DS, DS is the shoulder diameter of the mixing head, perpendicular to the machining direction, the axial centerline distance L2 between the forward and reverse mixing heads is 0.5D0 ~ DP, D0 is the diameter of the end of the stirring needle, and DP is the diameter of the root of the stirring needle; control the forward and reverse stirring heads to rotate at high speed and move into the plate, move along the friction stir processing direction for a certain distance at a constant speed, and then move out of the plate. After the first pass is completed, the forward and reverse stirring heads return to the initial processing position of the previous pass and move a distance less than the shoulder diameter perpendicular to the friction stir processing direction to ensure the overlap of the stirring zones between adjacent passes. , complete the second pass processing, and follow the above steps to complete subsequent pass processing.

Description

technical field [0001] The invention belongs to the technical field of ultra-fine-grain plate preparation, and in particular relates to a double-sided friction stir processing ultra-fine-grain plate equipment and method. Background technique [0002] The microstructure of the material is modified by stirring and friction, and the densification, homogenization and refinement of the microstructure of the material processing area can be realized through the severe plastic deformation, mixing, crushing and thermal exposure of the material processing area, which can be used specifically for the preparation of Ultra-fine-grained plates such as aluminum alloys, copper alloys, and magnesium alloys with grain sizes of micron and nanoscale. [0003] At present, in the process of preparing ultra-fine-grained plates, due to the influence of heat input and thermal cycle of friction stir equipment, as well as the imperfection of existing plate preparation methods, it is always inevitable ...

AI Technical Summary

Problems solved by technology

[0003] At present, in the process of preparing ultra-fine-grained plates, due to the influence of heat input and thermal cycle of friction stir equipment, as well as the imperfection of existing plate preparation methods, it is always inevitable to produce thermomechanical effects between adjacent stirring zones Due to the coarse structure and certain directionality of the thermal engine affected zone and the heat affected zone, the thermal engine affected zone and the heat affected zone have become weak mechanical properties, and the existence of the weak mechanical properties directly reduces the Therefore, there is an urgent need for an ultra-fine-grained sheet processing equipment and method that can effectively eliminate the thermal-mechanical-affected zone and the heat-affected zone

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