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High speed bearing has two characteristics, one is high precision, the other is high temperature resistance. High Speed Bearing Installation Therefore, high-speed bearings should be installed not only according to the requirements of high-precision bearings, but also according to high-temperature bearings. Therefore, the fit and clearance of the bearing should be considered when installing the high-speed bearing.
When installing high-speed bearing, two points should be considered: hardness change caused by temperature rise; High Speed Bearing Installation Force system changes and shape changes caused by high-speed rotating centrifugal force!
In order to ensure that the raceway deformation after bearing installation is small, the interference of interference fit cannot be too large, and the centrifugal force at high speed and thermal expansion at high temperature can offset the normal pressure on the mating surface. High Speed Bearing Installation Or relax the mating surface, so the interference must be calculated carefully on the premise of considering the above two factors. The effective interference at room temperature and constant speed may be invalid for high-speed bearings.
If the contradiction between the calculation results is too large (usually only at ultra-high speed), only the dual lubrication measures of under ring lubrication method and hydrostatic High Speed Bearing Installation lubrication method can be adopted, and this scheme may make the DMN value of the bearing break through the 3 million mark.
Thermal expansion at high temperature, or offset the normal pressure on the mating surface. Or relax the mating surface, so the interference must be calculated carefully on the premise of High Speed Bearing Installation considering the above two factors. The effective interference at room temperature and constant speed may be invalid for high-speed bearings.
If the contradiction between the calculation results is too large (usually only at ultra-high speed), High Speed Bearing Installation only the dual lubrication measures of under ring lubrication method and hydrostatic lubrication method can be adopted, and this scheme may make the DMN value of the bearing break through the 3 million mark.
1. The assembly site shall be kept as clean as possible without dust.
2. Avoid ina bearing from being contaminated with dust, High Speed Bearing Installation pollutants and moisture – pollutants have adverse effects on the operation and service life of the bearing.
3. Check the mating surface of bearing seat hole High Speed Bearing Installation and shaft: geometric and dimensional accuracy and cleanliness.
4. Apply a little oil or grease to the mating surface of bearing ring.
5. Ensure that the shaft and bearing seat hole have a High Speed Bearing Installation chamfer of 10-15 degrees.
6. Do not over cool the bearing: the moisture generated by condensation may lead to corrosion High Speed Bearing Installation of the bearing and its mating surface.
7. After installation: fill INA Bearing with lubricant and check whether the bearing configuration operates normally.
The preload can be obtained by grinding the end face of a ferrule in the bearing, or placing two spacer rings with different thickness between the inner and outer rings of a pair of bearings to clamp the bearings together so that the steel ball is in close contact with the raceway.
The preload has a great impact on the service life of the bearing. According to relevant data, when the bearing is equipped with 0.012mm interference, the service life is reduced by 38%, and when there is 0.016mm interference, the service life is reduced by 50%; When the bearing is equipped with a clearance of 0.004mm, the service life decreases significantly. When there is a clearance of 0.008mm, the service life decreases by 70%.
Therefore, it is very important to select the preload reasonably. Generally, small preload should be selected for high speed and large preload should be selected for low speed. At the same time, the preload shall be slightly greater than or equal to the axial working load.