At present, the rolling mill bearings mainly use grease lubrication and oil and gas lubrication. Most of the manufacturers now use simple and easy grease lubrication. If it is possible to adopt oil and gas lubrication technology, the rolling mill bearings can work under ideal lubrication conditions, which will greatly reduce bearing consumption.
1, grease lubrication
The grease lubrication method has the characteristics of simple and easy operation, convenient roll replacement, and wide application. The appropriate grease should be selected according to the working temperature, rotation speed, rolling force, sealing waterproof performance, impact vibration size, and grease supply method of the rolling mill bearing. Greases of regular manufacturers with high temperature resistance, high viscosity, excellent extreme pressure performance and high water repellency resistance should be selected. According to the working characteristics of the rolling mill bearing, 2#, 3#, lithium base grease or polyurea containing EP additive should be selected.
Although the high-performance grease purchase cost is high, the amount of use is small, the bearing life is long, and the total integrated cost is reduced. In addition, the filling amount of the grease must be in an appropriate amount and filled in place. The grease of different grades cannot be mixed, so that the working surface of the bearing of the rolling mill is always in the normal state of the oil film.
2, the amount of fat
Fill the inner space of the bearing when filling the grease for the first time. For the vertical roller or the inclined roller, fill the upper and lower covers of each bearing seat with a sufficient amount of grease. After each roll change, check whether the grease is hardened and blackened, contaminated with impurities, and oxidized and emulsified. If the above situation occurs, the grease should be completely replaced and the seal and sealing structure should be replaced or improved in time; if the situation is still good, the new grease can be added and continue to be used.
3, oil and gas lubrication
Oil and gas lubrication is the ideal lubrication method for bearings. During the working period, the compressed air enters the bearing with lubricating oil at intervals. The lubricating oil stays inside the bearing, and the air takes away the heat in the bearing operation while preventing external impurities. The water vapor is immersed inside the bearing. The oil is not atomized and does not pollute the environment.
4, sealing device
The seal of the bearing is to maintain a good internal lubrication state, and prevent the cooling water, iron oxide scale and impurities from immersing into the working surface to prolong the service life of the bearing. Due to the bearing seal problem of the rolling mill, the most damage to the bearing is the part near the side of the roller. The bearing is often contaminated and lost due to grease, causing the working surface of the part to wear, peel off or even chip, especially the infiltration of the emulsion of the cold strip mill. Grease failure is faster.
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