Study on roughness and residual stress of precision micro milling of high strength materials

Abstract

To optimize the surface quality of high-strength metallic materials for micro-milling so that the workpiece has better mechanical properties, making micro-groove on aluminum alloy 7075 and stainless steel 0Cr18Ni9 by micro-milling respectively, using orthogonal test and 1mm diameter four-blade micro-milling cutter. The surface roughness and residual stress of each micro-channel are measured. The influence of the speed of the spindle, the feed rate and the depth of the feed on the surface roughness value and the residual stress value is studied by the difference analysis. The range analysis method is uesd to obtain the ideal combination of cutting process parameters. The results show that under the same milling conditions, the surface quality of the 7075 aluminum alloy is better than that of the stainless steel 0Cr18Ni9. In the processing of 7075 aluminum alloy, the feed rate has the greatest impact on the surface roughness value, and the spindle speed has the largest effect on the residual stress value; In the processing of stainless steel 0Cr18Ni9, the spindle speed has the maximum effect on the roughness value and the residual stress value. The results has a certain reference value for improving the surface quality of micro-machined high-strength metal materials.