Matching accuracy and the choice of bearing

Bearing installation, to consider the extent of other parts of the match, which required not only for the bearing itself, and it wants to meet for the parts also have requirements. As the precision bearings within its accuracy 1μm, so ask its match components (shaft, bearing, end caps, ring, etc.) have very high dimensional accuracy and shape accuracy, especially with the precision to control surface and bearing the same levels, and this point is crucial, but also the most easily overlooked.
Must also pay attention to match the mechanical precision bearings fail if the above requirements, often makes precision bearings after installation, the error occurs several times bigger than the original bearings, or even 10 times more errors, completely not become a precision bearing, because the match machine Parts of error is often not a simple error on the overlay to the bearing, but with different added to the multiple enlarged.

      In order to improve the bearing with the precision of the actual installation, must be used not to bearing deformation measurement methods and measurement tools, on the bearing bore and the cylindrical surface co-precision measurement of the actual size can be the ID and OD measurements All items to be measured and the measured data on a comprehensive analysis, based on this, precision worthy of the bearing shaft and the seat hole the size of installation position. In the actual measurements with the shaft and the seat for the corresponding hole size and geometry should be measured in the bearings with the same temperature conditions.

To ensure a higher actual match results, shaft and bearing seat hole match with the surface, the roughness should be as small as possible. In making these measurements should be within the bearings and cylindrical hole, and the hole axis and the corresponding seat surface, near the assembly chamfer on both sides, were made to indicate the direction of the maximum deviation of two groups of markers, in order to In the actual assembly to match the maximum deviation between the two parties aligned the same direction, so that after assembly, the two sides to partially offset the deviation.

Directional signs to the purpose of the two groups is the compensation of the bias into account, even if both ends of the rotation supporting their accuracy improved, but also to seat between two bearing journal of the coaxial hole and both ends of the partial error elimination. With the implementation of surface hardening on the surface of measures, such as sand blasting, with slightly larger diameter column precision plug first plug the hole, etc., are beneficial to improve the fitting accuracy.
 

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