Title: Numerical and experimental study of thickness effect on deflection of glass plate in elastic deformation machining method

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

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

Abstract: Elastic deformation machining is a fabrication method that uses the elastic deformation properties of materials to make a desired surface form. Coupled with plane lapping machining process, the fabrication method is suitable for machining large aspheric surfaces. In this method, the workpiece is deformed under load and the bottom side of the workpiece is lapped to a flat surface. When the load is released, the bottom surface of the workpiece will be shaped into an aspheric shape. However, the thickness of workpiece is changed in the lapping process while the load remains unchanged. Therefore, the form accuracy of workpiece will increase with desired form surface. The effect of vacuum pressure on deflection of glass plate which changed thickness in lapping process is predicted in this study based on the numerical finite element analysis (FEA) results to determine vacuum pressure values which correspond with changed thickness of workpiece in the experimental process. The study indicates that, the effect of changed thickness on profile accuracy of workpiece in the elastic deformation machining is significant. The form accuracy of workpiece is improved from 62 µm to 1.6 µm which vacuum pressure is reduced from 50 kPa to 42 kPa in the experimental process.

Keywords: thickness effect; deflection; glass plate; elastic deformation machining; aspheric surfaces; glass lapping; finite element analysis; FEA; vacuum pressure values.

DOI: 10.1504/IJNM.2014.060796

International Journal of Nanomanufacturing, 2014 Vol.10 No.3, pp.254 - 264

Received: 07 Nov 2012
Accepted: 19 Jul 2013

Published online: 30 Apr 2014 *

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