Mill installation space limits the size of roller bearings (bearing bore diameter, outer diameter depends on the roll neck and roll body diameter), bearing the cross-section smaller, belong to the thin wall bearing, but they must also withstand greater radial load the use of multi-column roller bearing.
Currently the main use of four cylindrical roller bearings and four tapered roller bearings, double row cylindrical roller bearings, double row tapered roller. Tapered roller bearing most of the hollow roller and the pillars of the cage, to improve the lubrication conditions, bearing cylindrical surface and end, respectively, open the tank and the hole, when the clearance fit with the roll neck, circle hole in the bearing surface on the creation of a spiral tank.
The rolling of the roller bearing structure according to the different types of mill, different working conditions and different structural configuration determined. In general, the four cylindrical roller bearing is easy to obtain high machining accuracy, and therefore high-speed rotation features, but also because of its easy installation and removal, and pressure in the inner ring into the roll back of the neck to the inner ring raceway and the rolling roll surface at the same time grinding, which will help improve rolling accuracy, and more for high-speed, high-precision rolling mill roll, four tapered roller bearing load capacity, both radial and axial load, for low and medium speed mill .