切削加工に関する潤滑技術

―油剤供給方法の観点―

抄録

Tribology in cutting processes are explained for different cooling methods with flood coolant, MQL, high speed coolant, and high pressure coolant. First, the fundamental modeling of lubrication in cutting processes through gas phase lubrication, which can be applied to all the cooling methods, is depicted. This model explains the efficient lubrication of MQL, which could compensate the poor cooling ability of MQL in comparison with flood cooling. Computational fluid dynamic analysis of coolant flow in turning shows visibly that high speed coolant is much more effective than flood coolant for cooling high temperature area of a tool near the tool tip. Finally, the effects of high and ultrahigh pressure coolant on cutting processes are highlighted. Both kinds of coolant have two main roles in cutting: cooling and chip breaking. Chip breaking is a not-negligible action of these types of coolant, which contributes to the efficient cutting processes by solving one of ill-defined problems of chip control. The influence of coolant pressure on cooling and chip breaking is described comprehensively.