Research on the high-quality, low-wear single point diamond turning process of single crystal germanium

Hongxin Zhao; Bin Zhang; Shanyi Ma; Deqing Zhu

doi:10.1117/12.2655442

9 January 2023 Research on the high-quality, low-wear single point diamond turning process of single crystal germanium

Hongxin Zhao, Bin Zhang, Shanyi Ma, Deqing Zhu

Proceedings Volume 12507, Advanced Optical Manufacturing Technologies and Applications 2022; and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022); 1250716 (2023) https://doi.org/10.1117/12.2655442
Event: 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022), 2022, Changchun, China

Abstract

Single crystal germanium, which is a typical infrared optical crystal used for aerospace and astronomy applications due to their excellent mechanical, optical, and chemical property is difficult to obtain super smooth surface in ultra-precision turning and easy to cause tool wear owing to its inherent brittleness and hardness. In the processing process of single crystal germanium optical elements, good surface roughness is beneficial to improve the diffraction efficiency of single crystal germanium, while small cutting force can effectively lower the diamond tool wear caused by high hardness of germanium. In this paper, the single variable method is used to study the influence of the main factors in the single point diamond turning process on the surface roughness and cutting force of single crystal germanium, including spindle speed back cutting depth and feed. The experimental results are used to guide the machining process of the single crystal germanium diffraction surface, and the appropriate process parameters are selected to perform ultra-precision turning on the single crystal germanium with a very small cutting force to obtain a sub-nanometer ultra-smooth surface to improve the diffraction efficiency and reducing tool wear.

Citation Download Citation

Hongxin Zhao, Bin Zhang, Shanyi Ma, and Deqing Zhu "Research on the high-quality, low-wear single point diamond turning process of single crystal germanium", Proc. SPIE 12507, Advanced Optical Manufacturing Technologies and Applications 2022; and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022), 1250716 (9 January 2023); https://doi.org/10.1117/12.2655442

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KEYWORDS

Crystals

Germanium

Spindles

Single point diamond turning

Surface roughness

Surface finishing

Diamond machining

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