Micro Hole Piercing for Ultra Fine Grained Steel
Takafumi Komatsu*, Hitoshi Kobayashi*, Shiro Torizuka**,
and Shin-ichi Nagayama***
*Komatsuseiki Kosakusho Co., Ltd., 942-2 Shiga, Suwa-city, Nagano 392-0012, Japan
**National Institute for Material Science, 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan
***Tokushu Kinzoku Excel Co., Ltd., 56 Tamagawa, Tokigawa-machi, Hiki-gun, Saitama 355-0342, Japan
Ultra fine grained steels have been developed by many researchers. However, studies on the effects of different grain size on processes and product functions have been limited because the size of the bulk material has been small for these products. The authors have developed a production process for thin ultra fine grained stainless steel coil, and the effects have been clarified. This paper first reports the effects onmicro hole piercing by comparing materials with different grain sizes. Secondly, orifices are produced from these materials, and the liquid flow volume is measured as the functional effect of different grain sizes.
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