抄録
In the existing circumstances, a lot of oil is used in the cutting process and almost all oil is finally incinerated. One of the problem is that dioxin may be produced when the oil is incinerated. Therefore, we have to make a new cutting process to reduce these oils. A ideal solution to this problem is dry cutting, but the tool life is probably shortened because of the lack of cooling factor. Without the cooling factor, tool temperature increases significantly. About this heat process, we can surmise that, there are two factors in it. One of the factors is frictional heat between tools and work, and the other factor is generation of heat by oxidation. Then, the cutting in nitrogen gas can control the generation of heat by oxidation and increase the tool life. However in nitrogen cutting, higher, the concentration of nitrogen, more, the adhesion occurs. In this study, we tried to solve the adhesive problems by changing the cutting condition and tool materials. As a result, we can increase tool life such that high speed dry cutting is possible, which has been infeasible. Furthermore, Nitrogen cutting has the possibility that oxygen concentration changes the cutting characteristics by the lubricating effect of metal oxide film. In this study, we also turned our attention to that and examine the concern with nitrogen concentration.
