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	Improvement of active lap processing in grinding of 1.8m primary mirror
	Liu, Haitao1,2; Wu, Fan1; Zeng, Zhige1; Fan, Bin1; Wan, Yongjian1; Zhang, Yong1; Xian, Linhan1
	2014
会议名称	Proceedings of SPIE: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
会议日期	2014
卷号	9280
页码	92800Z
中文摘要	The computer controlled active lap (CCAL) is used to grind a 1.8m honeycomb primary mirror. One problem which is not totally solved by CCAL is the edge effect, also exists in many other fabricating methods. To reduce the CCAL edge effect, the pressure distribution on the contact face between lap and mirror is analyzed by finite element method (FEM). A new method is proposed to calculate the pressure curve from FEM results. A simplified model is used to approximate the pressure curve along the mirror radius when active lap covers the mirror center hole. The const-linear (C-L) model is used to describe the pressure curve when active lap overhang at the mirror out edge. The contact status between lap and mirror is also considered in this paper, and its influence is taken into the material removal rate calculation. The API's T3 laser tracker is used to measure the mirror surface shape and to check the correctness of the theoretical model. The results that we have got by now and the problems that still exist are reported in this paper. © 2014 SPIE.
英文摘要	The computer controlled active lap (CCAL) is used to grind a 1.8m honeycomb primary mirror. One problem which is not totally solved by CCAL is the edge effect, also exists in many other fabricating methods. To reduce the CCAL edge effect, the pressure distribution on the contact face between lap and mirror is analyzed by finite element method (FEM). A new method is proposed to calculate the pressure curve from FEM results. A simplified model is used to approximate the pressure curve along the mirror radius when active lap covers the mirror center hole. The const-linear (C-L) model is used to describe the pressure curve when active lap overhang at the mirror out edge. The contact status between lap and mirror is also considered in this paper, and its influence is taken into the material removal rate calculation. The API's T3 laser tracker is used to measure the mirror surface shape and to check the correctness of the theoretical model. The results that we have got by now and the problems that still exist are reported in this paper. © 2014 SPIE.
收录类别	EI
学科主题	Finite element method - Grinding (machining) - Lapping machines - Manufacture - Mirrors - Optical testing - Telescopes
语种	英语
ISSN号	0277786X
内容类型	会议论文
源URL	[http://ir.ioe.ac.cn/handle/181551/7612]
专题	光电技术研究所_先光中心
作者单位	1.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, China 2.University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Liu, Haitao,Wu, Fan,Zeng, Zhige,et al. Improvement of active lap processing in grinding of 1.8m primary mirror[C]. 见:Proceedings of SPIE: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes. 2014.

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