The installation of precision bearing 1. The precision bearing requirements for matching parts Due to the accuracy of precision bearing itself within 1 mu m, therefore requires matching parts, shaft, bearing and end cover, collar, etc.) with high dimensional accuracy and shape accuracy, especially fitting surface accuracy to control inside and bearing the same level, this is crucial, and also the most easily overlooked. Must also pay attention to the matching precision bearing parts if not meet the above requirements, often makes precision bearing in times larger than the original bearing error occurred after installation, even more than 10 times error, completely not be precision bearing, the reason is that the error of the matching part is often not simply by adding up the error of the bearing, but added in different multiples enlarged.

2. Precision bearing In order to ensure that do not produce too large deformation of the bearings after installation, must do it, (1) the shaft and hole of the roundness and retaining shoulder perpendicularity to request, according to the corresponding precision of bearing

(2) should not only precise calculation of rotating ring with the amount of interference, also to accurate calculation of the fixed ring with right quantity. The rotating ring burning interference quantity within may also should be made smaller.As long as to ensure that work under the temperature of thermal expansion effect, and under the maximum speed of centrifugal force effect, not cause peristalsis or sliding on the surface of the tight fit.Fixed ring according to the size of the working load and bearing size, choose the smallest clearance fit or interference fit, too loose or too tight is unfavorable to keeping the original precise shape.

(3) bearing such as under the condition of high speed running, and the working temperature is higher, should pay special attention to the matching of the rotating ring is too loose, to prevent the eccentric vibration, and the matching of the fixed ring is a gap, in order to prevent the ferrule deformation and vibration under load. (4) the condition of fixed circle take transgressions surplus to cooperate is suitable surface shape of both sides has a high precision and lower roughness, cause otherwise in installation and removal harder, in addition, also need to consider the influence of the spindle thermal elongation.

(5) use double angular contact ball bearing of the spindle in pairs, for the most part load lighter, its interference such as large amount, the amount of axial preload is its internal significantly larger, causing adverse effects.Using double row short cylindrical roller bearing of the spindle and spindle taper roller bearings, the load is opposite bigger, so its interference also relatively large.

3. The methods of improving the precision for actual cooperate To improve the actual coordination accuracy of bearing installation, must not make bearing deformation measuring method and measuring tools, the bearing surface of the inner hole and cylindrical coordinate measure precision of the actual size, can be related to the inner diameter and outer diameter measuring project all be measured, and make a comprehensive analysis of measured data, based on this, according to the precision with a shaft with a hole the size of the bearing installation site.In actual measurement for shaft and hole of the corresponding size and geometry shape, should be the same as the measured when the bearing temperature conditions.

In order to guarantee a higher actual cooperate effect, the surface of the shaft and hole and bearing are suitable, the roughness should be small as possible.

When measuring above, should be on the bearing outer circle and inner hole, as well as the shaft and hole corresponding to the surface, near the sides of the assembly chamfering can respond in Ming direction of maximum deviation of two sets of tags, so that when the actual assembly, make suitable maximum deviation on the same position of the two parties, so after the assembly, the two sides to partially offset the deviation. Make directional signs, the purpose of the two groups is the deviation of the compensation can be considered, even if the rotation of supporting their precision is improved, and between the two bearing hole and trunnion coaxiality error to get part on both ends.To cooperate with the surface to surface strengthening measures, such as sandblasting processing, with a slightly larger diameter of column precision plug plug a hole, etc., are beneficial to improve the fit precision.