In order to ensure that the bearing does not have excessive deformation after installation, the following points must be done：
First, the roundness of the shaft and the seat hole and the verticality of the shoulder should be required according to the corresponding accuracy of the bearing
Secondly, it is necessary to accurately calculate the interference fit of the rotating ferrule and the proper fit of the fixed ferrule.
Thirdly, if the bearing is running at high speed and the working temperature is high, special attention should be paid to the fit of the rotating ferrule not too loose to prevent eccentric vibration, and the fit of the fixed ferrule should not have gaps to prevent the ferrule from deforming under load. and excite vibration.
Fourthly, the condition for adopting a small interference fit for the fixed ring is that both sides of the mating surface have high shape accuracy and small roughness, otherwise it will be difficult to install and disassemble. In addition, the influence of thermal elongation of the spindle needs to be considered.
Last but not least, the main shaft using paired double angular contact ball bearings is mostly light in load. If the fit interference is too large, the internal axial preload will be significantly larger, which will cause adverse effects. The main shaft of the double row short cylindrical roller bearing and the main shaft of the tapered roller bearing have a relatively large load, so the interference is relatively large.
