1. Bearing cleaning. In the process of cleaning the bearing, all falling off, ponding, residual smoothing agent and any other dirt that will cause severe wear of the bearing shall be removed. The cleaning method and cleaning agent selected for cleaning bearings shall be determined according to the scale or quantity of bearings to be cleaned. Fire oil, mineral oil or other commercial solvents can be used for small bearings or a few bearings. For large bearings or multiple bearings, neutral oil can be used for cleaning in the cleaning box. The viscosity of 40% neutral oil is 22cst (or 100%, 100sus).
2. Check the bearing, including appearance and minor repair. If a small peeling or skin crack is found on the inner race raceway or roller surface of the removable roller, the metal peeling is generally removed with a grinder and the edge of the peeling surface is polished. The bearing wear degree shall be checked regularly, and the bearing wear can be evaluated by measuring the bearing clearance. Check and repair the bearing pedestal as required, or check and repair the roll neck as required, and then install the bearing with bearing pedestal back on the roll.
3. Lubricate the bearings. Due to the rapid development of aluminum processing industry, China has successively produced and imported many modern four high or six high rolling mills. These rolling mills have the characteristics of large rolling force and high rolling speed. The supporting roll bearings and their auxiliary equipment are required to have excellent viscosity temperature, oxidation safety, rust prevention, wear resistance and so on in terms of the smoothness of rolled products. At present, 220 medium load closed gear oil is mostly used as bearing smoothing agent for domestic aluminum rolling mill. The smoothing agent has the functions of reducing wear, taking away heat generated in conflict, anti-corrosion and rust prevention. Due to the disadvantages of high viscosity, high flash point, high sulfur content and poor annealing cleaning function of this smoothing oil, wytolb220 bearing stain free smoothing oil of aluminum rolling mill roll of Esso company of the United States is selected abroad. This smoothing oil has good anti-wear function, oxidation quiet function and good cleaning annealing function, And there is no oil pollution to aluminum rolled products.
4. Recommended amount of lubricating grease: the filling amount of smooth grease should be 2 / 3 or 1 / 3 of the space of bearing and bearing shell, and should not be too smooth. After grinding the roll each time, the amount of grease recommended to be added is 1 / 5 of the initial amount. The compensation period of smooth grease is related to the structure, speed, temperature and environment of the bearing. Users can adjust it according to the actual operating environment to keep clean smooth grease in the bearing under reasonable conditions.
Post time: May-04-2022