Rough surface modeling and contact analysis based on micro-scale spherical roller bearing

Based on Gaussian random function, the micro-contact model of spherical roller bearing is established by reverse engineering, and the contact states of surfaces with different roughness are calculated. The contact characteristics of contact surface such as equivalent stress, contact stress, contact area ratio and relative fatigue life are studied. Then, the accuracy of finite element calculation is verified by rough surface contact experiment. The results show that with the increase of displacement load, the equivalent stress and contact stress of contact surface increase, and the contact area ratio of rough contact surface increases steadily. With the decrease of roughness, the fatigue life of contact surface increases slightly. When the contact surface is close to smooth, the fatigue life of the contact surface is significantly improved, and the equivalent stress is significantly reduced: as the roughness of the contact surface is close to the target surface, the contact stress of the contact surface is significantly reduced. The results show that the roughness surface Ra = 0.05 μm has good performance in the aspects of equivalent stress, contact area and fatigue life. The contact stress of the roughness surface Ra = 0.4 μm has a minimum value, which provides a reference for selecting the machining accuracy of the contact surface of spherical roller bearings.