用金刚石磨头数控加工轴对称非球面光学玻璃透镜

为了提高轴对称非球面透镜的形状精度，降低其精加工成本，用金刚石小磨头在不同的加工参数和数控走刀轨迹条件下对K9光学玻璃透镜进行铣磨实验加工。透镜的轮廓精度用三坐标测量机测量，通过测量的数据点计算非球面透镜的法向轮廓度误差，并用数控加工时磨头的有效切削半径进行补偿。实验结果表明:当数控走刀轨迹为平行精加工和等高精加工时，加工后非球面透镜的面型精度最大轮廓度偏差PV和误差平均值RMS分别为54.48 μm和22.88 μm、98.46 μm和28.88 μm；通过优化金刚石磨头的有效切削半径可以提高非球面透镜加工的面型精度，平行精加工后优化的非球面透镜面型精度PV和RMS值分别为44.52 μm和7.37 μm。 

NC machining of axisymmetric aspherical glass lens with diamond grinding head

In order to improve the shape accuracy of axisymmetric aspheric lens and reduce its finishing cost, the K9 optical glass was milled with a small diamond grinding head under different processing parameters and NC tool path conditions. The profile accuracy of the lens is measured by a three-coordinate measuring machine. The normal profile error of the aspheric lens is calculated by measuring data points, and is compensated by NC machining of the effective cutting radius of the grinding head.The experimental results show that when the NC tool path is parallel finishing and contour finishing,the maximum profile deviation PV and the mean error RMS are 54.48 and 22.88 μm, 98.46 and 28.88 μm, respectively.The surface accuracy of aspheric lens can be improved by optimizing the effective cutting radius of diamond grinding head. The optimized PV and RMS values of aspheric lens profile accuracy after parallel finishing are 44.52 and 7.37 μm, respectively.