三角机加工大口径离轴抛物面技术

Technology of large aperture off-axis parabolic mirror with tri-station processing center

摘要: 为了实现大口径非球面镜的加工，设计制作了三角机加工中心，该加工中心具有三工位设计。基于该加工中心提出了一套非球面镜加工模型，每个工位只需利用两个转动轴即可实现大口径非球面镜的遍历加工，同时加工工位与检测工位可以互换，节约成本的同时提升加工效率。为了验证加工模型的可行性，结合工程实例，利用该加工中心对一口径为1 450 mm的离轴抛物面SiC反射镜进行了加工，实验结果表明，经过一轮迭代加工后，反射镜面形结果由PV 4.653m、RMS0.4097m收敛到PV 3.585m、RMS 0.2581m，RMS收敛达37%。验证了模型的精度及可行性。

Abstract: To accomplish the processing to aspherical mirror with large aperture, the tri-station processing center was designed which has three work stations. Based on the processing center, an aspherical processing model was established. With two rotating axes, it could be used to accomplish the full aperture processing. To verify the practicability of the model, with actual project, the processing to a 1 450 mm off-axis parabolic mirror was finished. The result shows that after a cycle of processing, the map of the mirror restraint from PV 4.653 m, RMS 0.409 7 m to PV 3.585 m, RMS 0.258 1 m. The converging rate of RMS is 37%, which verifies the accuracy and practicability of the model.