What matters should be paid attention to when installing precision bearings?

It is often used as the supporting parts of the high-speed electric spindle to be installed in pairs, and is the pivotal accessory of the high-speed electric spindle of the inner surface grinder.

What should be paid attention to when installing precision bearings

The service life of high-speed precision bearings has a lot to do with installation, and the following matters should be noted:

1. The bearing installation should be carried out in a dust-free and clean room. The bearing should be carefully selected and the bearing spacer should be ground. The parallelism of the spacer should be kept under the condition of maintaining the same height of the inner and outer ring spacers. Control below 1um;

2. The bearing should be cleaned before installation. When cleaning, the inner ring slopes upwards, the hand feels flexible, and there is no sense of stagnation. After drying, put in a certain amount of grease, if it is oil mist lubrication, put a small amount of oil Mist oil;

3. Special tools should be used for bearing installation, the force is even, and it is strictly forbidden to knock;

4. Bearing storage should be clean and ventilated, no corrosive gas, relative humidity should not exceed 65%, long-term storage should be scheduled to prevent rust.

In order to improve the actual matching accuracy during the installation of precision bearings, it is necessary to use measurement methods and measuring tools that do not deform precision bearings to perform actual precision measurement of the matching surface dimensions of the inner hole and outer circle of the precision bearing. The measurement items of the inner diameter and outer diameter are all measured, and the measured data is analyzed comprehensively. Based on this, the precision matched the size of the precision bearing installation part of the shaft and the seat hole. When actually measuring the corresponding size and geometry of the shaft and the seat hole, it should be carried out under the same temperature conditions as when measuring the precision bearing. (Guide: Share several ways to prevent loosening of nut threads)

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

When making the above measurement, it should be made on the outer circle and inner hole of the precision bearing, and on the corresponding surface of the shaft and the seat hole, on the two sides close to the assembly chamfer, respectively, which can show the direction of the maximum deviation. Group marks, so that the maximum deviation of the two matching parties can be aligned in the same direction during actual assembly, so that after assembly, the deviation of the two parties can be partially offset.

The purpose of making two sets of directional signs is that the compensation of deviation can be considered comprehensively, even if the rotation accuracy of each support at both ends is improved, the coaxiality error of the seat hole between the two supports and the journal at both ends Partially eliminated. The implementation of surface strengthening measures on the mating surface, such as sandblasting, using a precision plug with a slightly larger diameter to plug the primary inner hole, etc., are all conducive to improving the mating accuracy.

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