著者

中島 利勝 塚本 真也 吉川 満雄 竹原 健一 横溝 精一

出版者

公益社団法人精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.60, no.10, pp.1490-1494, 1994-10-05

被引用文献数

2 4

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In previous report [J. Japan Soc. Prec. Eng., 59, 3, (1993) 491.] under considering wheel surface topography and ground surface profile, it is theoretically predicted that a spring constant of grain mounting is extremely small in a very top surface of grinding wheel, and that the average of the spring constant and its variation become higher in the inner position from the wheel surface. In this report in order to make clear the displacement behaviors of abrasive grains during grinding process, the spring constant of individual abrasive grain mounting on the vitrified wheel surface are experimentally determined from the load-displacement curve of an abrasive grain measured by micro-Vickers hardness tester. The distribution of spring constant of abrasive grain is first analyzed and then it is made clear that the spring constant mentioned above can be predicted theoretically. And it is also made clear that the spring constant becomes to increase or decrease by steps as the elastic deformation or breakage takes place in the bond material.

著者

宇野 義幸 金枝 敏明 横溝 精一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.59, no.566, pp.3199-3204, 1993-10-25

被引用文献数

5 6

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In this paper, we present the possibility of biological machining by bacteria as a new technique for metal removal. There are some kinds of chemolithotrophic bacteria which gain energy from inorganic matter and fix carbon dioxide of the air. Among them, there is a particular bacteria, Thiobacillus ferrooxidans, which "eats" metals. Machining of grooves on pure iron and pure copper by Thiobacillus ferrooxidans is experimentally investigated. The experimental analysis made it clear that biomachining was possible, since the depth of the groove generated on the workpiece increased approximately proportionally to the machining time. Furthermore, electric field assisted biomachining proved to be even more effective, because the removal rate became much higher under an electric field.