Abstract
The frictional behavior of some cutting fluids are examined with a four-ball apparatus. The balls for usual four-ball apparatus are made of steel, but in this experiment a steel ball for the upper frictional member and tungsten carbide balls for the lower members are used, because the friction in cutting is the one between steel and tungsten carbide. At the low speed the frictional behaviors between steel and tungsten carbide is somewhat different from the behaviors between the steel each other. The difference is explained in view of the conductivity of heat. At high speed, however, the difference is insignificant.The effects of chlorine and sulphur are discussed. In the experiment, it is found that the higher the chlorine content, the better frictional behaviors are obtained. The inclusion of sulphur does not improve the frictional behavior, but increase the critical load.
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