Rolling bearings, the roll neck is used for metallurgical , mining , and other rolling mill stand , the roller bearings used . Usually cylindrical roller bearing radial load , deep groove ball bearings or angular contact ball bearings , thrust or radial design or design of tapered roller bearing axial load . Now mostly used lubricating oil or lubricating oil mist lubrication way to cool the bearings.
( 1 ) Spherical Roller Bearings
Early in the rolling mill bearing types and configurations are different now , when the main use of two spherical roller bearings mounted side by side on the same roll neck . This configuration is basically the type of production to meet the prevailing conditions, the rolling speed of up to 600rpm. But with the increased speed , the more prominent drawback : short bearing life , consumption , low precision finished , roll neck badly worn , and large roll axial movement .
( 2 ) four cylindrical roller bearing + thrust bearing
Cylindrical roller bearings and roll neck diameter tight fit , radial force , with a large load capacity , extreme high speed, high precision, detachable and interchangeable inner and outer rings , easy processing , low production costs , easy installation and removal , etc. ; thrust bearing axial force , the specific structure type can be selected according to the characteristics of the mill .
When heavy low-speed , with thrust roller bearings , with a smaller axial clearance to withstand the thrust load. When the high speed rolling mill bearing , angular contact ball bearings with not only high speed limit , and can be strictly controlled axial clearance work . The roll to get close to the axial guidance, axial load and can withstand normal force . This type of bearing arrangement not only has a long bearing life , high reliability, and finished with a high rolling precision , easy to control , and many other advantages , it is currently the most widely used for wire rod mill , plate mill , foil rolling mill , two support rollers hot rolling mill and cold rolling mill rolls and other support .
( 3 ) four-row tapered roller bearings
Tapered roller bearings can support radial forces , but also to withstand the axial force, without the need to configure the thrust bearing , so the host is even more compact. Tapered roller bearings and roll neck diameter using loose fitting , installation and removal is very convenient , but sometimes caused by a loose fitting sliding creep , so often processed inside diameter spiral tank . This type of configuration is still relatively wide current application , such as hot rolling mill and four-roll cold rolling mill work rolls , blooming machines, steel mill rolls and other occasions .