中国光学, 2016, 9 (3): 364, 网络出版: 2016-06-06   

高精度非回转对称非球面加工方法研究

Research on manufacturing method of non-rotationally symmetrical aspheric surface with high accuracy
作者单位
国科学院 长春光学精密机械与物理研究所 应用光学国家重点实验室 超精密光学工程研究中心,吉林 长春130033
摘要
本文提出一种高精度非回转对称非球面加工方法。首先, 通过范成法铣磨出非回转对称非球面的最佳拟合球; 然后, 利用古典抛光修正小磨头确定抛光难以修正的中频误差; 最后, 利用高精度气囊抛光设备(IRP)精确对位精修面形, 在不引入额外中频误差条件下, 通过高精度对位检测技术实现非回转对称非球面高精度加工。将该方法应用于定点曲率半径为970737 mm、k=-1、口径为106 mm三次非球面加工, 降低了加工难度, 提高了加工精度, 面形误差收敛到1/30λ(RMS)。实验结果验证了本文加工方法的正确性和可行性, 对高精度非回转对称非球面加工具有一定的指导意义。
Abstract
A novel manufacturing method of non-rotationally symmetrical aspheric surface with high accuracy is proposed in this paper. First, a optimum fit sphere of non-rotationally symmetrical asphere is ground through generating cutting, which is then polished through triditional polishing method in order to remove mid-spatial-frequency errors that cannot be realized through sub-aperture polishing tool. Finally, bonnet polishing method(IRP) is used for corrective polishing without generating extra mid-spatial-frequency errors in condition of high-accuracy positioning measurement technology. This method is employed in the manufacuring of a third-order aspheric surface with parameters of ROC=970737 mm, k=-1 and D=106 mm. After several polishing iterations, the figure accuracy can be converged to 1/30λ(RMS). The correctness and feasibility of the manufacturing method are proved. This method would be meaningful in manufacturing non-rotationally symmetrical aspheric surface with small deviation in the future.

徐乐, 张春雷, 代雷, 张健中. 高精度非回转对称非球面加工方法研究[J]. 中国光学, 2016, 9(3): 364. XU Le, ZHANG Chun-lei, DAI Lei, ZHANG Jian. Research on manufacturing method of non-rotationally symmetrical aspheric surface with high accuracy[J]. Chinese Optics, 2016, 9(3): 364.

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