Abstract
Using circumferentially, axially, and obliquely ground steel discs, the changes in the frictional force during the running-in process have been examined under the lubricated rolling with sliding contacts. The results obtained were much different depending on the surface topography, the hardness combination, the slip ratio, etc. Especially, the circumferentially ground discs showed a considerably high friction and severe wear occurred in the different hardness combination. Based on the results of experiments and measurements of the surface temperature, the surface hardness, the surface profile, the state of oil film formation, etc., the authors discuss the mechanisms which cause such differences.
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