Study on Fine Annealing Process of the Large-Aperture K9 Glasses

Wang Gang, Liu Yi Bin, Li,Zhang Hui, Xie Lei, Qiu Fu Min,Ma Ping,Yan Ding Yao

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE（2016）

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Abstract

Study on fine annealing process of the large-aperture K9 glasses was carried out in the report. The process parameters of glass placed way, fan speed and design of the cavity for keeping temperature uniformity were attained. By the fine annealing experiment, the stress distribution was improved evidently. The stress changed from Irregular distribution to consistency symmetric distribution and the stress max was reduced. The surface profile accuracy of the large-aperture K9 glasses was controlled steadily during CNC polishing

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Key words

Fine annealling,internal stress,Cavity for keeping temperature uniformity,Fan rate,Surface profile accuracy

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