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Proceedings Paper

Critical condition of brittle-ductile transition of optical glasses in ultraprecision grinding
Author(s): Mingjun Chen; Feihu Zhang; Shen Dong
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Paper Abstract

In this paper, based on the indentation under different loads, the influence factors for brittle-ductile transition of optical glasses has been investigated theoretically through the simulation of a single grain grinding with the diamond indenter. By the surface and fracture features, the grinding rules and the critical load conditions for the brittle-ductile transition of different optical glasses, the critical grinding depth of the single grain and its influence factors are obtained for the brittle-ductile transition in ultra-precision grinding process. The experimental results show that brittle- ductile transition of optical glasses is controlled by cutting depth of a single grain. When the cutting depth is less than the critical depth, optical glasses are ground in ductile mode. When mean grain size is less than 20 μm, ductile mode grinding of optical glasses can be realized with the relatively larger tangential speed and smaller feed. Otherwise, lubricants is the important factor influence critical cutting depth. Finally, the experimental results of BK7 and FCD1 optical glasses grinding are given.

Paper Details

Date Published: 6 October 2000
PDF: 6 pages
Proc. SPIE 4231, Advanced Optical Manufacturing and Testing Technology 2000, (6 October 2000); doi: 10.1117/12.402795
Show Author Affiliations
Mingjun Chen, Harbin Institute of Technology (China)
Feihu Zhang, Harbin Institute of Technology (China)
Shen Dong, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 4231:
Advanced Optical Manufacturing and Testing Technology 2000
Li Yang; Harvey M. Pollicove; Qiming Xin; James C. Wyant, Editor(s)

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