Ultraprecision Cutting Process of Anisotropic Super-elastic Alloy

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The purpose of this research is to obtain fundamental information for making clear the generation mechanism of ultraprecision machined surface of anisotropic super-elastic alloy with a diamond tool. Especially, in the case of ultraprecision cutting of anisotropic super-elastic alloy, it is difficult to finish the surface with high geometrical accuracy. Then some factors generating geometrical accuracy in ultraprecision cutting of Al-Mg alloy are investigated by analyzing finished surface profile and cutting heat in ultraprecision cutting process. Main conclusions obtained in this research are as follows : (1) Workpiece surface is finished in a concave profile with convex center in ultraprecision cutting. (2) Such profile of finished surface is generated by the thermal expansion of diamond tool and workpiece with cutting heat or spring back of cutting edge. (3) The maximum temperature rise at cutting point runs to 130℃. (4) The profile of finished surface is as same as that simulated with temperature rise and coefficient of thermal expansion of cutting tool.