High-speed bearing installation and adjustment

1. Matching and clearance of high-speed bearings Because high-speed bearings must be in accordance with high-precision bearing requirements and high-temperature bearing requirements, when considering the fit and clearance, the following two points should be considered:

(1) dimensional change and hardness change from normal temperature to high temperature;

(2) Force system changes and shape changes caused by centrifugal force at high speed.

In short, under the conditions of high speed and high temperature, it is difficult to maintain the accuracy and working performance of the bearing from the selection of the fit and the clearance.

In order to ensure that the raceway deformation after the bearing is installed, the interference of the interference fit cannot be made too large, and the centrifugal force at high speed and the thermal expansion at high temperature may offset the normal pressure of the mating surface. Or the mating surface is relaxed, so the interference must be carefully calculated under consideration of the above two factors, and the effective interference at normal temperature and normal speed may be ineffective for high-speed bearings.

If the calculation result is too contradictory (usually only under ultra-high speed), only the double lubrication measures used in the ring lubrication method and the static pressure lubrication method are adopted, and this scheme may make the dmn value of the bearing break through. The 3 million mark.

Thermal expansion at high temperatures, or offsetting the normal pressure of the mating surface. Or the mating surface is relaxed, so the interference must be carefully calculated under consideration of the above two factors, and the effective interference at normal temperature and normal speed may be ineffective for high-speed bearings.

If the calculation result is too contradictory (usually only under ultra-high speed), only the double lubrication measures used in the ring lubrication method and the static pressure lubrication method are adopted, and this scheme may make the dmn value of the bearing break through. The 3 million mark.

When considering the high-speed bearing clearance, not only the above factors should be considered, but also the influence of the thermal elongation of the shaft on the clearance should be considered. It is required that the bearing has the best clearance under the working condition, that is, at the working temperature. The kind of play is formed in the state of precise alignment of the center of the inner and outer ring grooves. Since high-speed bearings strive to reduce relative sliding and internal friction, it is best not to adjust the clearance of the ball bearings by means of the relative misalignment of the inner and outer rings in the axial direction.

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FAG bearing inner ring fixing method

The performance of rolling bearings is highly dependent on their material properties. FAG usually uses low-alloy, high-purity, integrally-tempered chrome steel as the material for the manufacture of bearing rings and rolling elements. For bearings bearing high impact loads and alternating bending stresses, carburized steel is used.

In recent years, FAG has been able to significantly increase the bearing capacity of its bearings due to the continuous improvement in the quality of bearing steels (of course, the price is also rising). Research results and practical experience have proven that today's standard rolling bearing steel bearings can achieve unlimited fatigue strength under good lubrication, clean environment and low load.

The heat treatment process of the FAG rolling bearing ring and the rolling element ensures that the bearing is within 150 degrees and the size is stable. For higher operating temperatures, special heat treatment methods are required. If the bearing is used in a corrosive environment, the bearing steel is required to be corrosive. Standard bearings made of stainless steel are prefixed with S in the code number; and suffix W203B.

This bearing is identical to the main dimensions and load carrying capacity of the overall hardened bearing steel bearing. In order to maintain its corrosion resistance, its surface cannot be damaged during installation and use. FAG produces silicon nitride balls for ceramic spindle bearings.

Ceramic balls are much lighter than steel balls, and centrifugal force and friction are also significantly smaller than steel balls. This type of bearing can still reach extremely high speeds during grease lubrication, and has a long service life and low operating temperature.

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