Title: Experimental study on aspheric surface machining using elastic deformation moulding method

Authors: Zhe Wu; Binghai Lv; Julong Yuan; Ducnam Nguyen; Ping Zhao; Qianfa Deng

Addresses: National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha 410082, China ' Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China ' Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China ' National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha 410082, China; Department of Mechanical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City 70000, Vietnam ' Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China ' Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China

Abstract: A novel aspheric surface machining, elastic deformation moulding method is proposed. Based on the linear elasticity of brittle optical materials, the elastic deformation moulding method can convert complicated aspheric surface machining to simply flat surface machining. The basic principle of the new method is described, a concave parabolic mould made of micro-porous ceramic is designed and machined, and an elastic deformation moulding machining system based on vacuum absorption is built. A machining experiment is then carried out. After 45 min lapping and 90 min polishing, a parabolic surface with form accuracy less than P-V 1.8 µm (within the radius of 9 mm) and a smooth surface with roughness Ra 7 nm is obtained, and the reasons of the machining form error generation are analysed. Experimental results show that the proposed aspheric surface machining method can achieve high machining quality with high efficiency.

Keywords: elastic deformation moulding; aspheric surfaces; glass lapping; glass polishing; linear elasticity; brittle optical materials; micro-porous ceramics; vacuum absorption; surface roughness; surface quality.

DOI: 10.1504/IJNM.2013.057599

International Journal of Nanomanufacturing, 2013 Vol.9 No.5/6, pp.555 - 569

Available online: 13 Nov 2013

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