Device and method for processing ultrafine-grained plate through double-sided stirring and friction

Abstract

The invention discloses a device and method for processing an ultrafine-grained plate through double-sided stirring and friction. An obverse stirring head and an adverse stirring head which have the same dimension are located above and below the plate respectively, the relative positions of the obverse stirring head and the adverse stirring head are determined firstly during processing, the distance L1 between the axial center line of the obverse stirring head and the axial center line of the adverse stirring head in the stirring and friction processing direction is DS-4DS, the DS is the diameter of a shaft shoulder of each stirring head, the distance L2 between the axial center line of the obverse stirring head and the axial center line of the obverse stirring head in the direction perpendicular to the processing direction is 0.5D0-DP, the D0 is the diameter of the end of a stirring needle, and the DP is the diameter of the root of the stirring needle; the obverse stirring head and the adverse stirring head are controlled to rotate at a high speed, enter the plate and come out of the plate after moving by a certain distance in the stirring and friction processing direction at an even speed, so that the first pass is completed; then the obverse stirring head and the adverse stirring head return to the initial processing position of the last pass and move in the direction perpendicular to the stirring and friction processing direction by a distance smaller than the diameter of the shaft shoulder, the stirring zone overlapping quantity between adjacent passes is guaranteed, and processing of the second pass is completed, and processing of subsequent passes can be completed according to the above steps.

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

Images