The most typical bearing among rolling mill bearings is the roll bearing. Roller bearings are important components used to support the rollers and maintain their correct position in the frame. The friction coefficient of the bearing is related to rolling energy consumption; the service life of the bearing is related to the utilization rate of the rolling mill; the stiffness of the bearing has an impact on the dimensional accuracy of the rolled products. Therefore, steel rolling production requires roll bearings to have a small friction coefficient, sufficient strength and a certain stiffness. In modern rolling mills, the structure of the roll bearings also needs to facilitate quick roll change operations. Typical rolling bearing types include four-row cylindrical roller bearings and four-row tapered roller bearings.