Abstract
In order to improve the load-carrying capacity of case-carburized gears, the effect of mirror polishing on surface fatigue of rolling-sliding contact was investigated. Case-carburized test rollers were finished by cylindrical grinding machine after the heat treatment. The ground surface of test rollers was finished by hand finishing with the abrasive paper and the buff. Next, the surface durability of test rollers was examined by using a 2-roller-type fatigue testing machine. For test rollers with the mirror polished surface, the following results are obtained : The rise of surface temperature during running is low. The number of pits decreases. The pitting fatigue life is longer under the heavy load conditions. The value of the endurance limit of the surface durability becomes higher. From these results, it is found that the tooth surface should be finished as smooth as possible to obtain the higher load-carrying capacity of case-carburized gears.
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