Abstract
In order to develop the case-carburized gears with the high load-carrying capacity, the changes in the rolling-sliding contact surface of the newly-manufactured Cr-Mo-Si steel were studied. First, the surface damage of test rollers was examined by using a scanning electron microscope. Secondly, the surface roughness, the surface hardness and the size of test rollers were measured with the use of surface roughness measuring instrument, hardness tester and digital micrometer. In the rolling-sliding contact surface of the Cr-Mo-Si steel that the fatigue tests were carried out, the following results are obtained: (1) It is possible to decrease the size of occasional micro pit. (2) It is possible to decrease the variation of surface roughness. (3) It is possible to decrease the variation of surface shape. (4) It is possible to decrease the variation of surface hardness with the high frictional temperature. (5) It is possible to decrease the variation of external diameter.
