Forging Bearings

详情

High quality cluster mill bearing,forging roll bearing

The NNCF series of backing bearings of was originally developed for cold rolling mills of the cluster types in the ***0s. Backing bearings are roller bearings having a particularly thick-walled outer ring that can be mounted on stationary support shafts to form back-up or straightening rolls. (Picture 1 is of the backing bearings on the eight support shafts of a **-roll mill). The NNCF series of backing bearings are produced in many designs but generally based on double or three-row cylindrical roller bearings, in the form of full complements bearings ( without cage) or as caged bearings, with or without integral flanges or flange rings, also with contact or non-contact seals. Single row roller bearings and double row tapered roller bearing designs are also available. Because lubricant is supplied to the bearings via the support shaft, the bearings have lubrication holes and some have one or more annular grooves in the inner ring.

The advantage of the bearings without flanges lies in their particularly simple geometrical form and their very high radial load carrying capacity. Cylindrical roller backing bearings without flanges or flange rings cannot accommodate any axial load. It is therefore necessary to place thrust washers of bronze or plastic between the side faces of the outer ring and the support saddles.

Thrust washers are not required using backing bearings with flanges (or flange rings) as the design of these bearings enables them to accommodate simultaneously acting radial and axial forces.

The NNCF series of backing bearings can also be designed and manufactured to meet customers’ special needs.

 

Tolerance and Materials

The NNCF series of backing bearings lead to more accurate rotation than GBP4 bearings. In particular, control of cross-sectional difference is more stringent and generally less than 5 um in the same group, the difference between neighboring frames is less than 3um.

Before the NNCF series of backing bearings leave the factory, they are strictly labeled according to the requirements of the customers. Support shafts with the same interface are assembled on a shaft and installed based on serial numbers. The stability and flexibility of bearing rotation is examined after assembly.

The majority of multi-roll mills and support bearings are lubricated by oil or grease. The viscosity of emulsions used for bearing lubrication should be at least ***2mm at *0 Celsius, and the flow rate must be higher than that of normal lubricating oil. The degree of cleanliness also has a decisive impact on the service life of support bearings, requires multiple-level filtering. The lubrication of sealed bearings or double row tapered roller bearings must use oil mist or point of lubrication oil. The viscosity of the lubrication oil must be between **0 and **0mm at *0 degree Celsius.

Maintenanceand Re-processing