Common Problems And Solutions For INA Bearing Installation!

The surface of INA bearings is coated with anti-rust oil, which needs to be carefully cleaned with sanitary gasoline or kerosene, and then coated with clean, high-quality or high-speed and high-temperature lubricating grease before installation and use. The influence of hygiene on bearing life and vibration noise is very large. Fully enclosed bearings do not need to be cleaned or refueled.

The installation surface and installation require a certain environment and place. If foreign matter such as iron filings, burrs, dust, etc. enter the INA bearing, the bearing will make noise and vibration during operation, and even damage the raceway and rolling body. Therefore, it is necessary to ensure the hygiene of the installation surface and installation environment before installing the bearing.

When lubricating INA bearings, the more grease is applied, the better. This is a common misconception. Excessive grease in the bearing and the bearing chamber will cause excessive mixing of the grease, and then generate extremely high temperatures. The amount of lubricant filled in the bearing should be preferably one-half to one-third of the internal space of the bearing, and should be reduced to one-third at high speed.

When installing, do not hammer the bearing end face and non-stressed surface directly. Use a pressure block, sleeve or other installation tools to make the bearing evenly stressed. Do not install through the rolling body. If the installation surface is coated with lubricating oil, it will make the installation smoother. If the interference fit is large, the bearing should be placed in mineral oil and heated to 80 to 90 degrees before installation. Strictly control the oil temperature not to exceed 100 degrees to avoid the tempering effect, hardness reduction and influence on dimensional recovery. When disassembly is difficult, it is recommended that you use the disassembly tool to pull outwards while carefully pouring hot oil on the inner ring. The heat will expand the inner ring of the bearing and then make it fall off.

Lubrication has a very important influence on the operation and life of INA bearings. Here is a brief analysis of the general principles for selecting grease. Grease is made of base oil, thickener and additives. The performance of different varieties and different brands of grease of the same variety varies greatly, and the allowed rotation limit is different. It is necessary to pay attention when selecting. The performance of grease is mainly determined by the base oil. Usually, 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. Thickener is also related to lubrication performance. The water resistance of thickener determines the water resistance of grease. In principle, greases of different brands cannot be mixed. Secondly, even greases with the same thickener will have a negative impact on each other due to different additives.

Not all INA bearings require the minimum operating 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-group 2, group 0, group 3, group 4, and group 5. The clearance values ​​are from small to large, among which group 0 is the standard clearance.

The basic radial clearance group is suitable for normal working conditions, conventional temperatures and commonly used interference fit. Bearings operating under special conditions such as high temperature, high speed, low noise, and low friction should use large radial clearance. Bearings for precision spindles and machine tool spindles should use smaller radial clearance. For roller bearings, a small amount of working clearance can be maintained. For separated bearings, there is no clearance. The working clearance of the bearing after installation is greater than the original clearance before installation. The elastic deformation of INA bearings caused by cooperation and load.