Abstract
In this paper, first if was clarified how to evaluate the effect of heat transfer to ball-fixtures through steel ball surfaces on bulk temperature rises of steel balls in operation and then using the result an equation to calculate maximum contact surface temperature considering bulk temperature rises in operation was given. After the examination of experimental results obtained by a Shell type Four Ball Machine and calculated results, the following conclusions are deduced. The larger the contact surface area is, the greater the effect of bulk temperature rises of steel balls on maximum contact surface temperature becomes. Quantities of heat transferred to ball-fixtures amounted to 40 percent of supplied heat quantity in the case of stationary steel ball and as much as 70 percent in the case of rotating steel ball, and so in calculation of bulk temperature rise of steel ball in operation they cannot be ignored.
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