What are rolling mill bearings? 

Roller bearings refer to those used in the sheet rolling industry, namely for the rolling of non-ferrous metals, ferrous metals and non-metallic products. They are the bearings located at the roller diameters of the rolling rollers and on the drums. Usually, four-row cylindrical roller bearings are used to bear the radial loads, while thrust roller or thrust ball bearings, as well as radial angular contact ball or radial roller bearings, are used to bear the axial loads. Currently, most of them are lubricated and cooled by means of oil-air lubrication, oil mist lubrication or grease. 

Inspection of bearings during operation 

To meet the requirements of the usage environment, bearings should be listened to, observed and measured regularly. Listening involves using an instrument to place your ear close to the bearing to listen to the impact and friction sounds during its operation; observation involves checking the operating environment, installation position, vibration deviation and lubrication conditions; measurement involves using a thermometer and a vibration meter to conduct quantitative detection on the bearing housing. 

Inspection of the bearing in a stationary state 

Check the tightness of the spare parts to ensure that the components are in the correct position and not loose. The bearing seats need to be inspected regularly to see if they are properly tightened, especially there should be no axial clearance between the operating side bearing seat and the steel rolling frame to reduce the impact of the transmission shaft's vibration on the bearings. At the same time, check the bearing lubricant to ensure that the lubricating oil is free of impurities. The rough rolling mill experiences large impact loads, resulting in intense bearing vibrations, and lubricating grease is prone to loss. Therefore, it needs to have strong adhesion to maintain lubrication and sealing. External contaminants are likely to contaminate the lubricating grease, causing bearing wear, crack expansion, and possible cracking of the raceway. In severe cases, the related components should be scrapped. 

Post-extraction inspection of the bearing 

The removed rolls should be cleaned with a cleaning agent for the bearings, dried with compressed air, and inspected for rollers, cage and raceways. If there are any dents or pitting, replace the components as needed. Check the axial seal and radial clearance, and ensure everything is correct before adding lubricant for future use. The bearing of the rolling mill operates in a special environment, so attention should be paid to the installation, inspection and maintenance methods, and process regulations should be formulated to reduce the risk of bearing burnout. The lifespan of the bearing is affected by multiple factors, and it is necessary to manage comprehensively and formulate process regulations to extend the service life and ensure smooth production. 

Maintenance, inspection and abnormal handling of rolling mill bearings 

In order to maintain the original performance of the bearing in the best condition for as long as possible, maintenance, inspection and prevention of accidents should be carried out to ensure the reliability of operation and improve productivity and economy. The maintenance should be in line with the operation standards of the mechanical equipment and be carried out regularly. The contents include monitoring the operating condition, replenishing or replacing the lubricant, and regular disassembly inspections.