Abstract
This report is a study of the rolling friction between a steel ball and two flat steel plates having various surface roughnesses. The results obtained are as follows.
(1) With repeated traversals on the same track, the plastic peformation gradually comes to saturated, and the equilibrium state is reached, then the deformation becomes primarily elastic. In both stages of the rolling process, large variations of the rolling force occur which are due to the surface roughness and irregularities, but these magnitudes of the variation are almost the same.
(2) The values of the pure rolling force during the course of rolling on the flat plates are held constant independently of surface roughness.
(3) The coefficient of the pure rolling force is of the order of 10-5, and this value is equivalent to the force for a ball rolling upgrade less than 0. 01°angle, and rolling on the smoother surface than 0. 02 μm Ra roughness.
