Imported bearings are widely used, and the installation, use, cleaning and maintenance of bearings are also very particular. Therefore, some problems will naturally be encountered in the use of bearings. Next, Bearing-Bearing Distribution-Bearing Authorized General Agent will explain to you the knowledge about the installation and maintenance of imported bearings. 1. Requirements for bearings on the installation surface and installation place. If iron filings, burrs, dust and other foreign matter enter the bearing, it will cause noise and vibration during the operation of the bearing, and even damage the raceway and rolling elements. Therefore, before installing the bearing, you must ensure that the installation surface and installation environment are clean. 2. The bearing must be cleaned before installation. The surface of the bearing is coated with anti-rust oil. You must clean it carefully with clean gasoline or kerosene, and then apply clean high-quality or high-speed and high-temperature lubricating grease before installation and use. The impact of cleanliness on bearing life and vibration noise is very large. But we would like to remind you that fully enclosed bearings do not need to be cleaned and refueled. 3. Selection of bearing radial clearance Not all bearings require the smallest working clearance, you must choose the appropriate clearance according to the conditions. In the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups - 2 groups, 0 groups, 3 groups, 4 groups, and 5 groups. The clearance values ​​​​are in order from small to large, and group 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and commonly used interference fit; bearings working under special conditions such as high temperature, high speed, low noise, and low friction should choose a large radial clearance; Bearings for precision spindles and machine tool spindles should use small radial clearances; for roller bearings, a small amount of working clearance can be maintained. 4. Bearing installation and disassembly Do not directly hammer the bearing end face and non-stressed surface when installing. Use a pressing block, sleeve or other installation tools to make the bearing evenly stressed, and do not install through rolling elements to transmit force. If the installation surface is coated with lubricating oil, it will make the installation smoother. If the fit interference is large, put the bearing in mineral oil and heat it to 80~90°C and install it as soon as possible, and strictly control the oil temperature not to exceed 100°C to prevent the tempering effect from reducing the hardness and affecting the dimensional recovery. When you encounter difficulties in disassembly, it is recommended that you use a disassembly tool to pull outwards and carefully spray hot oil on the inner ring. The heat will expand the inner ring of the bearing and make it easier to fall off. 5. Adding bearing grease When bearings are lubricated, the more grease the better, this is a common misconception. Excessive grease in bearings and bearing chambers will cause excessive agitation of the grease, which can generate extremely high temperatures. It is advisable to fill the bearing with lubricant for 1/2 to 1/3 of the internal space of the bearing, and reduce it to 1/3 at high speeds. Sixth, the choice of bearing grease Lubrication has a very important impact on the operation and life of the bearing, here is a brief introduction to the general principles of selecting grease. Lubricating grease is made of base oil, thickener and additives. The performance of different types and different grades of the same type of grease is very different, and the allowable rotation limit is different. Be sure to pay attention when choosing. The performance of lubricating grease is mainly determined by the base oil. Generally, low-viscosity base oil is suitable for low temperature and high speed, and high-viscosity base oil is suitable for high temperature and high load. The thickener is also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease. In principle, greases of different brands cannot be mixed, and even greases with the same thickener will have a bad influence on each other due to different additives.
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