The method of improving the actual fit accuracy of precision bearing

In order to improve the actual fitting accuracy of bearing installation, it is necessary to use the measuring method and measuring tools that do not deform the bearing to carry out the actual precision measurement of the fitting surface dimensions of the inner hole and outer circle of the bearing. All the measuring items of the inner diameter and outer diameter can be measured, and the measured data can be comprehensively analyzed. Based on this, the bearing of the shaft and the seat hole can be precisely matched The size of the loading position. In the actual measurement of the corresponding size and geometry of the shaft and seat hole, it should be carried out under the same temperature conditions as when measuring the bearing.

In order to ensure a higher actual matching effect, the surface roughness of the shaft, seat hole and bearing should be as small as possible.

During the above measurement, two groups of marks indicating the direction of large deviation should be made on the outer circle and inner hole of the bearing, and on the corresponding surface of the shaft and seat hole, on both sides close to the assembly chamfer, so that the large deviation of the two matching sides can be aligned in the same direction during the actual assembly, so that the deviation of both sides can be partially offset after the assembly.

The purpose of making two sets of orientation marks is to comprehensively consider the compensation for the deviation, so that the rotation accuracy of the supports at both ends can be improved, and the coaxiality error of the seat hole and the journal at both ends between the two supports can be partially eliminated. Surface strengthening measures, such as sandblasting and plugging the primary inner hole with a slightly larger diameter precision plug, are beneficial to improve the fitting accuracy.