抄録
For the purpose of the development of case-carburized gears for the high load carrying capacity, the relation between tooth surface-finishing method and surface durability of gear was studied. First, the surface qualities of ground roller, shot peened roller and shot peeded and ground roller made of the hypoxia vacuum melting case-carburized alloy steel were examined by means of a scanning electron microscope and a penetrometer, etc. As the result, the effect of the shot peening processes on surface shape, surface roughness and surface hardness of the case-carburized alloy steel are clarified. Secondly, the surface durability of three kinds of roller was investigated by using a 2-roller-type contact fatigue testing machine. The following results are obtained : The influence of shot peening processes on damage, roughness and hardness of the rolling-sliding contact surface is clear. The increase in surface hardness with shot peening processes does not always have an advantageous effect on surface durability.
