The Effect of the Cutting Fluid Upon Chip-Tool Interface Temperature

An analysis is presented of the short-circuiting effect of a cutting fluid in conjunction with chip-tool interface temperature measurements by the tool-work thermocouple technique. An experimental arrangement based upon the results of this analysis and capable of giving reliable cutting temperatures in the presence of fluids is described. The temperature-reducing characteristics of a representative group of water-base cutting fluids are studied, and these experiments reveal that the fluids become less effective in reducing the cutting temperature as the volume of metal removed per unit time is increased. The water-base fluids considered are found to reduce the tool-tip temperature by a cooling action to a greater extent than by a reduction of the friction force on the face of the tool.