Four-Row Cylindrical Roller Bearings

• • • • • • • All four-row cylindrical roller bearings only support radial loads, therefore, they must be used in combination with thrust bearings such as angular contact ball bearings or tapered roller bearings.

              The four-row cylindrical roller bearing is a typical rolling mill bearing. The parts can be separated from each other, and the parts can be exchanged with high precision. The installation, disassembly and cleaning are very convenient. In a given radial installation space, it can provide the largest radial load capacity, and has a low friction coefficient.

              There are three main types of structure, namely: FC type, FCD type, FCDP type four-row cylindrical roller bearings. 

              FC type four-row cylindrical roller bearings:

              FC type bearing for rolling mill is a separable bearing, and the integral inner ring can be separated from the whole set of bearings, with high limit speed and interchangeability. The cage is a machined brass cage. FC type four-row cylindrical roller bearings must firstly be suitable for high-speed rotation (35m/S) . Carrying capacity is the second factor to be considered. Generally, a four-row cylindrical bearing with an inner diameter of 80 mm-260 mm is designed as a secondary structure and mainly used in the work roll part of cold rolling four-roller, six-roller and twelve-roller

              FCD type four-row cylindrical roller bearings:

              FCD type bearing for rolling mill is a separable bearing, and the degree of separability is poor compared to the FCDP structure, except that the two inner rings can be separated from the entire set of bearings,and it has a higher limit speed and interchangeability. The cage of FCD type rolling mill bearing is machined brass or steel cage. This type of bearing is not only suitable for high speed (35m / S) but also can withstand heavy loads at the same time. Generally, four-row cylindrical bearings with inner diameter of 260mm -400mm are designed as secondary structure. FCD type rolling mill bearing is mostly used in the section finishing mill and high-speed wire rod rough rolling, intermediate rolling and pre-finishing rolling parts, including the backup roll, intermediate roll and work roll part of cold rolled nonferrous and ferrous metal rolling mill.

              FCDP type four-row cylindrical roller bearings:

              It is typical rolling mill bearing which parts can be separated from each other, and  installation, disassembly, cleaning is very convenient. In a given installation space, it can provide maximum radial load capacity, and has a low friction coefficient. Therefore, FCDP type bearing for rolling mill is suitable for the roll diameter of the rolling mill with high speed, heavy load and harsh working environment.

              In order to accommodate the maximum number of rolling elements to provide the best radial load-bearing capacity, the cage of the four-row cylindrical roller bearing with an inner diameter of more than 400 mm is generally designed as a pin-type cage, which consists of two washers and a post connecting the two washers and passing through the center of the roller. And the two ends of the final pillar and the gasket are riveted and fixed by argon arc welding, and the cage has high strength. This is very important for bearings that withstand frequent shocks or withstand large acceleration and deceleration movements.