Surface quality in axial ultrasound plunging-type grinding of bearing internal raceway

In order to obtain good fatigue resistance and surface quality for the inner raceway of a bearing, the cut-in-type grinding test of M50 bearing inner raceway was carried out by using axial ultrasonic vibration. Based on abrasive kinematics, the abrasive trajectory cut-in-type axial ultrasonic vibration grinding is established, and the mathematical models of surface roughness, tangential force (F_t), and residual stress related to grinding transmission are given. The effects of the ultrasonic amplitude and wheel speed on the surface roughness, residual stress, and hardness of the workpiece in a certain grinding time are obtained by single-factor experiments. The results show that under the action of axial ultrasonic vibration, the grinding efficiency is increased by 21% compared with the conventional internal raceway cut-in-type grinding process. At the same time, the residual compressive stress and roughness increase first and then decrease with the increase in amplitude. The maximum roughness can be reduced by 26%, the residual stress can be increased by 19.3%, and the hardness can be increased by 2.5%. At the same time, the correctness of the theoretical model is verified by tests.