Ultraprecision Cutting Process of Anisotropic Super-elastic Alloy

本研究的目的是为阐明各向异性超弹性合金金刚石刀具超精密加工表面的形成机理提供基础资料。特别是在各向异性超弹性合金的超精密切削加工中，难以获得高几何精度的表面。通过对铝镁合金超精密切削加工表面形貌和切削热的分析，研究了影响铝镁合金超精密切削加工几何精度的因素。主要结论如下：（1）超精密切削加工中，工件表面是以中心凸的凹轮廓加工而成。(2)这种加工表面轮廓是由金刚石刀具和工件在切削热作用下的热膨胀或切削刃的回弹产生的。(3)切割点最高温升达130℃。(4)加工表面轮廓与考虑刀具温升和热膨胀系数时的模拟结果一致。

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.