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Common problems in bearing installation

by:JNSN     2021-12-25

1. Are there any requirements for the appearance and occasion of the device? Yes. If there are iron filings, burrs, dust and other foreign matter in the bearing, it will cause noise and vibration when the bearing is running, and even damage the raceways and rolling elements. Therefore, before installing the bearing, you must ensure that the appearance and condition of the device are clean.

2. Is it necessary to clean the rolling bearing device before installation?  The bearing surface is coated with anti-rust oil. You must clean it carefully with clean gasoline or petroleum, and then coat it with clean, high-quality or high-speed and high-temperature smooth grease before installation. . The impact of cleanliness on bearing life and vibration and noise is very long. But what we want to remind you in particular is: the fully sealed bearing does not need to be cleaned and refueled. Third, how to choose smooth grease? Smooth has a very important influence on the operation and life of the bearing. Here is a brief introduction to the general criteria for choosing smooth grease. The smooth grease is made of base oil, thickener and additives. The functions of different varieties and different trademarks of different varieties are very different. The allowed torsion limit is different, so you must pay attention to it when choosing. The function of smooth grease is mainly determined by the base oil. Ordinary low-viscosity base oil is suitable for low temperature and high speed, and high viscosity is suitable for high temperature and high load. The thickener is also related to the smoothing function, and the water resistance of the thickener determines the water resistance of the smooth grease. In principle, different brands of smooth grease cannot be mixed, and even the same thickener smooth grease will have a bad influence on each other due to differences in additives. Fourth, when sliding bearings, the more grease is applied, the better?  When sliding bearings, the more grease applied, the better. This is a common misconception. Excessive grease in the bearing and the bearing chamber will cause excessive agitation of the grease, and then extremely high temperatures will occur. The number of lubricants filled in the bearing should be 1/2 to 1/3 of the inner space of the bearing, and it should be reduced to 1/3 at high speed. 5. How to install and disassemble?  Do not directly hammer the end face and non-stressed surface of the bearing during the installation. Press blocks, sleeves or other devices (tooling) to make the bearing evenly stressed, and do not pass through the rolling element transmission device . If the surface of the device is coated with smooth oil, it will make the device smoother. If the common interference is large, the bearing should be put into mineral oil and heated to 80~90℃, and the device should be installed as soon as possible. The oil temperature should not exceed 100℃ to avoid tempering effect, hardness reduction and dimensional recovery. When disassembling and encountering difficulties, it is recommended that you use the disassembled object to pull out and carefully pour hot oil on the inner ring. The heat will expand the inner ring of the bearing and make it easier to fall off. 6. Is the radial clearance of the bearing as small as possible?  Not all bearings require the smallest task clearance. You must choose the appropriate clearance based on the premise. 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 u200bu200bare in order from small to large, and the middle 0 group is the standard clearance. The basic radial clearance combination is used for common operating conditions, common temperature and common interference; bearings that are tasked under extraordinary conditions such as high temperature, high speed, low noise, low friction, etc., should use large radial clearance; Fine spindles, bearings for machine tool spindles, etc. should choose a smaller radial clearance; for roller bearings, a small number of mission clearances can be maintained. In addition, there is no such thing as the clearance of the separate type bearing; in the end, the task clearance after the bearing is installed is smaller than the original clearance before the installation, because the bearing has to accept the inevitable load torsion, and the bearing is shared with the load. The amount of elastic deformation.

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