1. The external force applied during assembly should not be transmitted through the rollers or balls of the bearing to avoid damage to the bearing.
2. The non-impact way of loading and unloading is preferred.
3. When you need to tap, the way should be correct.
4. For bearings that require transmission accuracy, such as the bearings of the main shaft, there are often preload requirements. Because these bearings can only achieve the nominal accuracy with a reasonable preload. For example, the main shaft of a lathe, generally the front and the rear are radial thrust roller bearings. After assembly, it needs to be pre-tightened by the nuts at both ends to meet the requirements of the spindle runout.

Generally, the preload is a parameter provided by the bearing factory. However, in the actual assembly process, it is not possible to measure whether the preload meets the requirements. Traditionally, the assembly workers are often installed by experience.

In some structures, the method of measuring the amount of preload deformation in advance can be used. For example, a radial thrust bearing with a preload of 20kg. We can put the outer ring of the bearing on the platform, and then apply 20kg force to the inner ring. Measure the change in height difference between the inner and outer rings before and after the force is applied, which can generally be measured by a lever dial indicator. After the deformation amount is obtained, a gasket is designed in the preload structure, and the height difference of the gasket is exactly the amount of change before and after the preload. In this way, it is ensured that after the nut is tightened, the preload remains unchanged. Change the previous assembly method by the labor force of the workers, the integral bearing assembly

5. If there are iron filings, burrs, dust and other foreign objects entering 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.
6. Is it necessary to clean the bearing before installation? The bearing surface is coated with anti-rust 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. The impact of cleanliness on bearing life and vibration noise is very large. But we would like to remind you that: the fully enclosed bearing does not need to be cleaned and refueled.
7. How to choose grease Lubrication has a very important influence on the operation and life of the bearing. Here is a brief introduction to the general principles of grease selection. Grease is made of base oil, thickener and additives. The performance of different types and different brands of greases of the same type is very different, and the allowable rotation limits are different. Be careful when choosing. The performance of the grease is mainly determined by the base oil. Generally, the low viscosity base oil is suitable for low temperature and high speed; the 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 adverse effects on each other due to different additives.

When lubricating bearings, the more grease the better? When lubricating bearings, the more grease the better, this is a common misconception. Excessive grease in the bearing and bearing chamber will cause excessive agitation of the grease, resulting in extremely high temperatures.

8. How to install and disassemble Do not directly hammer the bearing end face and non-stressed surface during installation, and use pressure blocks, sleeves or other installation tools to make the bearing evenly stressed. If the mounting surface is lubricated, the installation will be smoother. If the interference is large, the bearing should be heated to 90-100℃ in mineral oil and installed immediately. In case of difficulty in disassembly, it is recommended that you use the disassembly tool to carefully pour hot oil on the inner ring while pulling outwards. The heat will expand the inner ring of the bearing, making it easier to fall off.
9. Is the radial clearance of the bearing as small as possible? No, all bearings require a small working clearance, you must choose the appropriate clearance according to the conditions. In GB4604-93, the radial clearance of rolling bearings is divided into five groups – 2 groups, 0 groups, 3 groups, 4 groups, 5 groups, the clearance values are from small to large, of which group 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, normal 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; Small radial clearance should be selected for precision spindles, machine tool spindle bearings, etc.; a small amount of working clearance can be maintained for roller bearings. In addition, there is no clearance for separate bearings; then, the working clearance of the bearing after installation is smaller than the original clearance before installation, because the bearing has to bear a certain load to rotate, and the bearing fit and load are generated. amount of elastic deformation.

The adjustment and pre-tightening process of rolling bearing clearance is an effective means to improve the bearing rotation accuracy and bearing capacity, and reduce the vibration and noise of the transmission system. In the assembly work, the concept should be clarified, the technical requirements of bearing assembly should be clarified, and at the same time, the control of bearing temperature rise and the maintenance of good lubrication should be taken into account. The correct application of this process method can ensure the quality of rolling bearing assembly.