How can precision bearings fit properly?

      Self-lubricating bearings can be no oil lubrication or less oil lubrication, can be used without maintenance or less maintenance. At the same time its wear resistance, friction coefficient, long service life. Precise bearings in the installation should pay special attention, in order to ensure that the bearing does not produce excessive deformation after installation, we must do:
1. Shaft and seat hole roundness and the verticality of the shoulder to be in accordance with the corresponding bearing accuracy requirements.
2. It is necessary to accurately calculate the amount of interference with rotating ferrule, but also to accurately calculate the appropriate amount of fixed ferrule.
Rotating ferrule burning interference should be made within the scope of possible smaller. As long as the effective guarantee of thermal expansion under the influence of temperature, as well as the maximum speed under the influence of centrifugal force, it will not cause a tight fit with the surface of the peristalsis or sliding. Fixed ring according to the size of the working load and bearing size, select the smallest gap fit or interference fit, too loose or too tight are not conducive to maintaining the original precise shape.
3. The operation of the bearing at high speed, and higher operating temperatures, with special attention should not be too loose rotatable collar, to prevent the occurrence with the eccentric, and a gap is not fixed to the ferrule, the ferrule in order to prevent the load Deform and vibrate.
4. Take a small interference fit condition of a mating surface of fixed ring both have high shape accuracy and a smaller roughness, or cause disassembly more difficult to install and difficult, in addition, also we need to consider the influence of thermal elongation of the spindle.
5. The use of pairs of double angular contact ball bearings spindle, most of the load lighter, with the interference is too large, the internal axial preload will be significantly larger, resulting in adverse effects. The use of double row cylindrical roller bearing spindle and tapered roller bearing spindle, the load is relatively large, so the interference is relatively large.