Studies of tool wear rate under conditions of constant interface thermal e.m.f.

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Abstract
The effect of the level of thermal e.m.f. between the tool and workpiece on the flank wear rate of the cutting tool is studied over a range of experimental turning tests carried out on a lathe fitted with a system of thermal e.m.f. control. The results of the studies indicate that, under controlled thermal e.m.f. cutting conditions, the e.m.f. at the tool-work interface provides an indication of the tool wear rate. The bulk and volume distribution of the workpiece are found to have a significant effect on the thermal e.m.f, and hence on the tool wear rate in conventional metal cutting. The measurement of thermal e.m.f. in a practical environment is considered to be feasible since the requirement that either the tool or workpiece is insulated may be easily realized and the measurement is not affected by the presence of coolant.

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