金刚石车削表面微观形貌形成机理的研究

Generation of surface micro-topography in diamond turning

为了在超精密加工前预测并控制表面粗糙度 ,提出一种建立圆弧刃车刀金刚石车削表面微观形貌的几何模型的新方法 ,开发并编写了表面微观形貌的仿真程序 ,在程序中考虑了刀具几何参数、振动和最小切削厚度对已加工表面特性的影响 .通过理论分析和试验研究确定了最小切削厚度与切削刃钝圆半径之间的关系 ,分析了影响已加工表面粗糙度的若干因素 ,并在仿真生成的表面微观形貌中成功地加入了随机振动信号 .大量切削试验是在自行研制的亚微米CNC超精密机床上进行的 .结果表明 :利用所建立的表面微观形貌几何模型 。

In order to predict and control the surface roughness before ultra-precision machining, a surface micro-topography simulation program is developed, and a surface micro-topography model based on the cutting geometry with a round nose tool is proposed, in which the effects of tool geometry, machine tool vibration and minimum cutting thickness on surface characteristics are considered. The correspondence between minimum cutting thickness and the tool edge radius can be found by the theoretical analysis and experimental investigation, and factors influencing the machine surface roughness are analyzed, and a random motion is included in the theoretical analysis of surface generation in this program. The cutting tests are carried out on a specially designed submicro CNC ultra-precision turning machine, and the results show that it is possible for us to predict the surface roughness by this model.