1. The importance of lubrication The lubrication of bearings is to use oil film to separate the rolling surfaces of relative motion from each other, so as not to fail due to excessive wear caused by rough point contact. If users can attach great importance to bearing lubrication technology, they can ensure stable performance and rotation accuracy during the predetermined working life. 2. Type and performance of grease The lubrication of rolling mill bearings is divided into grease lubrication and oil lubrication. The advantages of grease lubrication are that the lubrication facilities are simple, the grease is not easy to leak, and it has a certain ability to prevent water, gas and other impurities from entering the bearing. Therefore, generally Grease lubrication is widely used. Oil lubrication is used for heavy load, high speed, high temperature and other working conditions. Grease is composed of base oil, thickener and filler. The viscosity of the base oil plays an important role in the lubricating performance of the grease. The composition of the thickener has an important influence on the performance of the grease, especially the temperature characteristics, water resistance, oil separation, etc. The additives are mainly used to enhance the resistance of the grease. Gasification, anti-rust, extreme pressure and other properties. Greases are classified according to the types of thickeners, such as lithium-based and nano-based. Lithium-based grease is commonly used in rolling mill bearings. Lithium-based grease is characterized by good water resistance and high dropping point. It can be used in wet and water-contacting grease according to its fluidity. Penetration is divided into several levels. The higher the penetration value, the softer the grease. Roll bearing grease produced in China is a multi-component lithium complex grease compounded by high-grade grease acid-proof and synergist. It is also suitable for the lubrication of rolling mill bearings. 3. The filling amount of the grease The filling amount of the grease should be one-third and one-half of the space between the bearing and the bearing housing. If the grease is added too much, the grease will deteriorate due to the stirring and sweeping heat. or chastise. It should only be filled to a third or less at high speed. When the rotational speed is very low, the housing space can be filled to prevent external foreign physics from entering the bearing. 4. Replacement of lubricating grease The service life of lubricating grease is limited, its lubricating performance gradually decreases during use, and wear also increases gradually, so it must be supplemented and replaced every certain time. The replenishment period of the grease is related to the structure, speed, temperature and environment of the bearing, and should be determined according to the specific working conditions of the enterprise. When replacing grease, it should be noted that greases of different grades cannot be mixed, and the mixing of greases containing different types of thickeners will destroy the structure and consistency of lubrication. After the grease has been completely removed, add new grease.