Study on surface quality of aluminum alloy 7075 precision micro cutting

The micro cutting experiment of Aluminum alloy 7075 was carried out by using a self-developed orthogonal cutting experiment table. Single factor experiment was applied to study the influence of cutting speed and cutting depth on the surface quality of workpiece. The tool wear under different cutting conditions is also observed and analyzed. The experimental results show that the cutting depth and the cutting speed have a large effect on the tool wear. As the cutting speed increase, the machined surface roughness decreased at first and then increased, and the surface roughness increased gradually with the increase of cutting depth, and when the cutting speed v=300 mm/s, cutting depth ap=2μm, the minimum roughness value 0.283μm is obtained. When v=200 mm/s, ap=2μm, it will produce compressive residual stress (−10.7MPa) on the machined surface, but the residual stress will change from compressive stress to tensile stress when the cutting depth is greater than 5μm and increases with the increase of cutting depth.