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微透镜阵列作为一种非轴对称的复杂光学曲面,对轮廓精度及表面粗糙度的要求都非常高,在快刀伺服车削加工过程中,刀具补偿及其轨迹规划是非常重要的环节。首先介绍了刀具加工路径生成的基本流程,根据刀尖圆弧与工件曲面之间的几何关系,推导了刀位点坐标的计算公式;然后针对微透镜开口轮廓边缘区域,讨论了过渡区及其宽度和分布情况;最后提出了过渡区刀尖半径补偿优化算法,并基于MATLAB软件进行了加工仿真。结果表明提出的刀具路径优化方法能够有效提高微透镜轮廓边缘的加工精度。
As a kind of non-axisymmetric complex optical surface, the micro-lens array has very high requirements on the contour accuracy and surface roughness. Tool compensation and its trajectory planning are very important links in the servo-turning machining of the quick tool. Firstly, the basic flow of tool path generation is introduced. According to the geometrical relationship between tool nose and workpiece surface, the calculation formula of tool point coordinates is deduced. Then the transition zone and its Width and distribution of the tool tip radius. At last, an optimization algorithm of tip radius compensation in the transition zone is proposed and the machining simulation is carried out based on MATLAB software. The results show that the proposed tool path optimization method can effectively improve the processing accuracy of the micro-lens edge.