1. Inspection of bearings during operation

In accordance with the requirements of the bearing use environment, the bearing should be monitored, observed and measured regularly. Listening is the use of prescribed equipment to face the axial end cap of the bearing and the radial shell of the bearing seat, and the other end is attached to the ear to listen to whether the bearing has impact and mechanical friction during operation; observation is to observe the operating environment, installation location, vibration offset, lubrication, etc., whether there is an undesirable environment; measurement is to use a thermometer and a vibration meter to quantitatively detect the bearing seat.

2. Inspection of bearings in a stationary state

Check the fastening of the relevant spare parts, whether the parts are in the correct position, whether there is loosening, etc. Always check whether the bearing seat has been pressed and whether it is loose. In particular, there must be axial non-gap fixation between the operating side bearing seat and the rolling frame, and the mating gap between the driving side bearing seat and the rolling frame window must be reduced as much as possible to slow down the impact of the run out of the drive shaft on the bearing. In addition, the bearing lubricant can be tested to check whether the lubricant enters debris, iron oxide, water, etc. Rough rolling mills are usually subjected to strong shock loads, bearing vibration is large, and grease is easily lost. Therefore, the grease is required to have strong adhesion and can be firmly adhered to the surface of the parts. Part of the bearing is lubricated on the raceway, and the rest is stored in the internal space of the bearing to play a sealing role. If external dirt invades the bearing seat, the first thing to contaminate is the grease near the outside, causing wear on the surface of the bearing parts. With the increase of dirt, the wear surface will increase, and at the same time it will cause cracks in the outer layer and gradually expand, eventually cracking the ferrule, and in severe cases, related components such as rolls and bearing housings will be scrapped.

3. Post-disassembly inspection of bearings

After the roll is replaced, a cleaning agent can be used to clean the bearing, blow it dry with compressed air, and then inspect the roller, cage, and roller. Dents, pitting and other phenomena appear on the rollers and racetracks, and they should be replaced according to specific circumstances. At the same time, check the radial clearance of the axial sealed box, and after the inspection is correct, add lubricant for backup. In short, the bearings of rolling mills have their unique use environment, characteristics and requirements. The rolling force is small, and the cracking of the inner and outer rings of the bearing and the fragmentation of the rolling element caused by excessive load are very rare. Therefore, we should pay attention to the correct installation, inspection and maintenance of the bearing and formulate corresponding process procedures to reduce the accident rate of burning bearings in rolling mills. There are many factors that affect the service life of bearings. Therefore, a comprehensive management system and process procedures should be formulated in order to achieve the purpose of extending the service life of bearings and ensuring smooth production.

4. Maintenance, overhaul and exception handling of rolling mill bearings

In order to maintain the original performance of the bearing in good condition for as long as possible, it is necessary to maintain, overhaul, and prevent accidents in the future, ensure the reliability of operation, and improve productivity and economy. It is best to maintain the operating standards corresponding to the operating conditions of the machinery and carry out them regularly. The content includes monitoring the operating status, supplementing or replacing lubricants, and regular disassembly inspections.