Abstract
In our previous paper, the effects of viscosity of a cutting base oil for hobbing on the action of additives were investigated. It was revealed that a chlorinated fatty acid ester added to the high-viscosity base oil showed the best performance in terms of reducing hob wear and that the optimal content of chlorine was 3%. This paper deals with the effect of viscosity of a base oil on the synergism of EP additive and rape-seed oil. Experiments were carried out with a single fly tool. Among the additives used, a mixture of chlorinated fatty acid ester (chlorine:1%) and rape-seed oil (30%) added to a machine oil 68 with high viscosity gave the best performance in terms of decreasing hob wear and improving finished surface roughness for practical applications. In addition, the use of a small amount of sulfur and/or chlorine in cutting oil is effective for environmental pollution control and for improving the safety of the operator.
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