光学非球面凹面零件仿形加工方法的修正

从圆锥体靠模仿形法加工非球面光学零件的基本原理出发,指出加工凸非球面时无原理误差,但加工凹非球面时,只能用圆弧包络法加工。用实心圆锥体靠模时,必然存在误差。解决方法是减小工具的曲率半径,或增加一维数控进行补偿,或使用空心圆锥体仿形。实际应用中前两种方法只能减小误差,不能消除。而采用凹模仿形时,则不存在原理误差。

Correction of profiling method to process concave conic aspheric elements

Based on the principle of profiling with a solid cone,there are no theoretic errors to make any convex conic surface on the optic elements.But to the conic surfaces,only arc enveloping mode can be used and theoretic errors are exist inevitably.Solutions such as decreasing the tool's curvature radius,using means of single dimensional numerical control compensation or profiling with a hollow cone are effective.The two in front can reduce the errors but can not eliminate it in practice.Only by profiling with a hollow cone the theoretic errors can be avoided.