离轴抛物面镜的单件加工技术

介绍了单件加工离轴抛物面镜的基本过程。主要是先按公式算出起始球面半径，并磨好这个球面。然后计算出最大非球面修磨量，根据其大小决定修改非球面从细磨开始还是直接用抛光修改。用刀口检验离轴抛物面时的要点是一定要用直角刀口。修磨时要先修误差最突出的地方。关键的问题是避免出现马鞍形的局部误差。

Abaxial parabolic mirror unit processing technique

The unit processing of abaxial parabolic mirror is introduced. It’s basic process mainly involves, first, calculating the initial spherical radius according to given formulas and grinding the spherical surface, and then working out the maximum grinding amount of the non spherical surface before determining whether to modify the non spherical surface by fine grinding or directly by polishing. The point in testing the abaxial paraboloid is to make sure that a right angled blade is used. In figuring, it is important to start where the error appears most conspicuous. And the key problem lies in trying to avoid partial error in the shape of a saddle.