Effect of Grain Size in Stainless Steel on Cutting Performance in Micro-Scale Cutting
Takafumi Komatsu*, Takashi Matsumura**,
and Shiro Torizuka***
*Komatsuseiki Kosakusho Co., Ltd., 942-2 Shiga, Suwa-city, Nagano 391-0012, Japan
**Mechanical Engineering, Tokyo Denki University, 2-2 Kanda Nishiki-cho, Chiyoda-ku, Tokyo 101-8457, Japan
***Materials Reliability Center, National Institute for Material Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
The cutting processes of ultra fine grain stainless steels are compared to that of normal grain steel in microscale cutting with a single point tool made of single crystal diamond. Cutting force is measured with oscillation in the dynamic component. Vibration in cutting force is reduced with the grain size. Shear angles are measured to discuss the cutting process with changes in depth of cutting. The large shear angle is observed when the grain size becomes small. The surface finish is also improved when the ultra fine grain steel is machined.
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