Abstract
Recently, a use of chlorine compound as an EP additive in cutting oil has a tendency to decrease, because of prevention of environmental pollution and safety for the operator. In this paper, the influence of heat-treatment of high-speed steel hob materials on the tool wear reduction effect of additives in cutting oil for hobbing was investigated in order to develop a chlorine free additive. Experiments were carried out using a fly tool. Tricresyl phosphate is effective in terms of reducing tool wear and improving finished surface roughness, for high-speed steel containing high cobalt which was heat-treated at the low quenching temperature and high tempering temperature.
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