Aspheric surface processing method of high-precision CVD ZnSe lens

Abstract

The invention belongs to the single-point-diamond super-precision cutting technology field and mainly relates to a single point diamond turning processing method of a high-precision CVD ZnSe lens. The invention aims at providing the processing method which can be used to guarantee technology indexes of CVD ZnSe lens aspheric surface shape precision, surface imperfection, decentration and the like. The method is mainly characterized in that a single point diamond turning machine tool and a diamond arc knife are used to carry out super-precision turning processing on the CVD ZnSe lens; and a technological method processing flow mainly comprises blanking, external grinding, rough grinding, processing tooling, rough turning, semi-finishing turning and finish turning. The method has the advantages that an external grinding process is taken as a first process; through finish machining of a blank excircle, rough grinding technology index control and precision turning processing tooling, a lens center deviation technology index is guaranteed; simultaneously, a single point diamond turning process step is divided into the semi-finishing turning and the finish turning so that damaged layers when rough turning is performed on a blank material are effectively reduced, and the surface imperfection and a surface shape technology index are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of single-point diamond turning, and relates to a high-precision CVDZnSe lens aspheric surface processing method. Background technique [0002] Chinese Patent Publication No. CN1785560A, date of publication is June 14, 2006, titled "Processing Method of Zinc Selenide and Zinc Sulfide Aspheric Optical Components" discloses a processing technology for aspheric optical components, mainly used for selenium Processing of ZnC and ZnS aspheric components. Although this process method can achieve the purpose of mass production, its disadvantages are: there is no edging process, and the center deviation index is not controlled by the process; the semi-finishing cutting depth and feed rate of the components are relatively large, and the damaged layer in the subsequent finishing turning It is difficult to eliminate, and the turning lens surface cannot reach high-level surface defect indicators; the semi-finishing and ...

AI Technical Summary

Problems solved by technology

Although this process method can achieve the purpose of mass production, its disadvantages are: there is no edging process, and the center deviation index is not controlled by the process; the semi-finishing cutting depth and feed rate of the components are relatively large, and the damaged layer in the subsequent finishing turning It is difficult to eliminate, the surface of the turned lens cannot reach high-level surface defect indicators; the semi-finishing and finishing turning parameters of components are quite different, and the surface shape of parts cannot be perfectly copied and reproduced, and it is difficult to achieve high-precision surface shape indicators

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