Roller bearing mill installation space by the size limit (bearing inner diameter, outer diameter depends on the roll neck and roll body diameter), bearing small cross-section of high, thin wall bearings are, and they also have to bear greater radial load, Therefore, using multi-column roller bearings.
Currently the main use of four cylindrical roller bearings and four-row tapered roller bearings, also with double row cylindrical roller bearings, double row tapered roller. Tapered roller bearings they use a hollow roller and the pillar of the cage to improve the bearing lubrication, bearing cylindrical surface and end, respectively to open a fuel tank and the hole, as with the roll neck for the clearance fit, the bearing inner circle hole surface the creation of spiral grooves.
Roller bearing structure is based on different types of mills, different working conditions and a different structure configured to decide. In general, four row cylindrical roller bearings easily obtain high machining accuracy, Guer with high speed characteristics, but also because of their installation and removal easy, and can be inner pressure into the roll back of the neck to the inner ring raceway surface and roll surface while grinding, which will help to improve rolling accuracy, and more for high-speed, high-precision rolling mill bearing roller, four-row tapered roller bearing load capacity, able to support radial load and axial load for low and medium speed mill .
Import bearing corrosion causes and prevention of imported bearings corrosion by a variety of internal and external factors caused summed up are:
1. With the metal surface in contact with the various environmental media.
2. Metallic material itself of chemical composition and structure.
3. With the metal surface contact with the solution composition and pH value;
4. Ambient temperature and humidity.
5. Metal surface finish (oxygen concentration difference cell corrosion).
6. Another person's sweat is also the lead bearing corrosion, and its pH value of 5 to 6. Therefore, in order to prevent sweating caused by corrosion, installation and production personnel should wear gloves, it should not touch the imported bearings.