Rolling mill bearings manufacturer. Four-row tapered roller bearings 802227,Roll neck bearings 48680DW.620.620D made by FV BEARING INDUSTRIES perfectly replace the original bearings.
Four-row taper roller bearings are used successfully for rolling mill bearing arrangements where rolling speeds are slow to moderate. Because of their design they are able to take up those axial loads which occur in such applications in addition to radial loads and generally no separate thrust bearings are required in such arrangements. This means that the roll necks can be relatively short and the chocks at both sides of the roll can have the same design.Four-row taper roller bearings, because of their design, must be installed as complete bearings in the chocks. To enable quick roll changes to be made they must therefore have a loose fit on the roll necks. Loose fits have the disadvantage that the inner rings wander on their seatings under the prevailing load conditions causing wear to the seatings which normally have a lower hardness than the rings. To alleviate the effects of a loose fit to some extent, i.e. to reduce wear, FV bearings have a helical groove in the bore and / or lubrication grooves in the side faces of the inner rings. These grooves enable lubricant to be supplied to the contact surfaces of the inner ring and seating. Additionally, the grease-filled grooves can take up the wear particles.Bearings with lubrication grooves are identified by the following letters in the bearing tables. These letter codes follow the identification under the heading .G- Helical groove in bearing boreWl- grooves in inner ring side facesGWI- + Wl roll neck bearing arrangements which are subjected to high speeds or heavy loads, the inner rings must have an interference fit on the roll neck. To enable this to be achieved but still allow for reasonably quick roll changes, four-row taper roller bearings with a tapered bore are generally used.
