2024-03-28T12:53:37Z
https://kitami-it.repo.nii.ac.jp/oai
oai:kitami-it.repo.nii.ac.jp:00007161
2022-12-13T02:24:59Z
1:87
Experimental Study on the Ultraprecision Ductile Machinability of Single-Crystal Germanium
YAN, Jiwang
MAEKAWA, Kouki
TAMAKI, Jun-ichi
KUBO, Akihiko
open access
Japan Society of Mechanical Engieneers, J. Yan, K. Maekawa, J. Tamaki, A. Kubo, JSME International Journal Series C, 47(1), 2004, 29-36.
Single-crystal germanium is an important infrared optical material. In the present work, single-point diamond turning experiments on single-crystal germanium (100), (110) and(111) planes were conducted in order to examine their ultraprecision machining characteristics. Three kinds of surface textures and chip morphologies were observed during the brittle-ductile transition of the machining mode. The brittle-ductile boundary changed significantly with the crystal orientations of the workpieces. Due to the crystallographic anisotropy, micro-fractures were generated on the workpiece surface in a radial pattern from the rotation center. However, it was possible to produce completely ductile-cut surfaces on all crystal orientations by using undeformed chip thicknesses smaller than a critical value, namely, the minimum critical undeformed chip thickness, which was approximately 60 nm under the present conditions. Compared to wet cutting, dry cutting was beneficial for ductile machining on a few specific crystal orientations. The findings in this study provide criterions for determining process parameters for the fabrication of aspherical and diffraction infrared optics using single-crystal germanium.
application/pdf
日本機械学会
2004-01
eng
journal article
VoR
https://kitami-it.repo.nii.ac.jp/records/7161
http://doi.org/10.1299/jsmec.47.29
JSME International Journal Series C
47
1
29
36
https://kitami-it.repo.nii.ac.jp/record/7161/files/4390.pdf
application/pdf
5.6 MB
2016-11-22