Noise and vibration will be generated during operation. If there are iron filings, burrs, dust and other foreign matters in the bearing. It may even damage the raceway and rolling element. Therefore, before installing the bearing, you must ensure that the appearance of the device and the installation environment are clean. The bearing surface is coated with antirust oil. You must carefully clean it with clean gasoline or kerosene, and then apply clean, high-quality or high-speed and high-temperature lubricating grease before installation and use.
Cleanliness has a great impact on bearing life and vibration noise, but I would like to remind you that the fully enclosed bearing does not need to be cleaned and refueled. Lubrication has a very important impact on the operation and service life of bearings. Here is a brief introduction to the general principles of choosing lubricating grease. The lubricating grease is made of base oil, thickener and additives. The performances of different kinds of greases and different brands of the same kind vary greatly, and the allowable rotation limit of the bearing seat is different. Be sure to pay attention to the selection.
The performance of lubricating grease is mainly determined by the base oil. Generally, the base oil with low viscosity is suitable for low temperature and high speed, and the base oil with high viscosity is suitable for high temperature and high load. Thickener is also related to lubricating performance. The water resistance of thickener determines the water resistance of lubricating grease. In principle, greases of different brands cannot be mixed, and even greases with the same thickener will have bad effects on bearing seats due to different additives.
When lubricating bearings, the more grease you apply, the better. This is a common misconception. Too much grease in the bearing and bearing chamber will cause excessive mixing of grease, resulting in extremely high temperature. The amount of lubricant filled in the bearing should be 1/2 1/3 full of the internal space of the bearing. It should be reduced to 1/3 at high speed. When the device is installed, do not directly hammer the bearing end face and non stress surface. The bearing should be evenly stressed by pressing block, sleeve or other device tools. The bearing seat should not be installed through rolling element transmission force.
If the surface of the device is coated with lubricating oil, the installation will be more smooth. If the fit interference is large, put the bearing into mineral oil and heat it to 80~90 ℃ and install it as soon as possible. Strictly control the oil temperature not more than 100 ℃ to prevent tempering effect, hardness reduction and size recovery. In case of assembly difficulties, it is recommended that you use the disassembly tool to pull outward and carefully pour hot oil on the inner ring. The heat will expand the inner ring of the bearing, making it easier to fall off. Not all bearings require the minimum working clearance, so you must choose the appropriate clearance according to the conditions.
