Methods for Improving the Actual Fit Precision of Precision Bearings

In order to improve the actual fitting accuracy during bearing installation, it is necessary to use measurement methods and tools that do not deform the bearings to accurately measure the fitting surface dimensions of the inner and outer holes of the bearings. All measurement items related to the inner and outer diameters can be measured, and a comprehensive analysis of the measured data can be conducted. Based on this, the dimensions of the bearing installation parts of the precision matching shaft and seat hole can be determined. When measuring the corresponding dimensions and geometric shapes of the matched shaft and seat hole in practice, it should be carried out under the same temperature conditions as when measuring the bearing.
To ensure a high actual fit effect, the roughness of the surface that matches the shaft and seat hole with the bearing should be as small as possible.
When making the above measurements, two sets of marks should be made on the outer circle and inner hole of the bearing, as well as on the corresponding surfaces of the shaft and seat hole, on both sides near the assembly chamfer, indicating the direction of the maximum deviation. This is to ensure that the maximum deviation of the matching two sides is aligned in the same direction during actual assembly, so that the deviation between the two sides can be partially offset after assembly.
The purpose of making two sets of directional signs is to comprehensively consider the compensation for deviation, which not only improves the rotation accuracy of each end support, but also partially eliminates the coaxiality error of the seat holes and the two end journals between the two supports. Implementing surface strengthening measures on the mating surface, such as sandblasting and inserting a slightly larger diameter precision plug into the inner hole, is beneficial for improving the mating accuracy.