Mr. Young-Jae Kim Profile

Young-Jae Kim

at Y&DK Co., Ltd

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Proceedings Article | 30 November 2023 Poster + Paper

Effect of ultrasonic vibration on ultra precision diamond turning of polycrystalline zinc sulfide

Woo-Jong Yeo, Hwan-Jin Choi, Mincheol Kim, Minwoo Jeon, I. Jong Kim, Min-Gab Bog, Young-Jae Kim, Wonkyun Lee

Proceedings Volume 12778, 1277817 (2023) https://doi.org/10.1117/12.2691652

KEYWORDS: Vibration, Ultrasonics, Zinc sulfide, Crystals, Diamond turning, Surface roughness, Diamond machining, Manufacturing, Transmittance, Spindles

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Zinc sulfide (ZnS) exhibits unique properties that make it highly suitable for applications as a multi-wavelength optical element. Its transmittance shows significant improvements in the visible light and near-infrared regions when subjected to high-temperature and high-pressure processes. However, the mechanical cutting of ZnS is limited due to its brittleness and polycrystalline properties. In this study, we propose the feasibility of employing ultrasonic vibration cutting to enable the mechanical cutting of polycrystalline zinc sulfide. The objectives are to analyze both the ductile mode machining and brittle fracture behavior while addressing the issue of spring back encountered during the diamond turning process. Analysis is conducted on cutting parameters, including vibration amplitude, spindle speed, cutting depth, and feed rate, to evaluate their impact on the cutting process. The results showed that we establish ultrasonic vibration cutting can indeed lead to improved cutting quality under specific conditions. We demonstrated the potential of ultrasonic vibration cutting as a promising alternative technique for the precision machining of polycrystalline zinc sulfide. The resolution of the spring back problem represents a significant advancement, potentially enabling the manufacturing of high-quality optical elements using polycrystalline material.

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