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4 ways to increase stiffness

release time:2018-05-26
1, bearing configuration, bearing configuration has a great impact on bearing rigidity. In general, for the radial thrust type ball bearings and roller bearings, the opposite configuration of the large end face of the outer ring should be adopted when used in pairs, so that the ability of the bearing to resist the overturning moment is large. The amount of preload that is adjusted when the temperature changes is also less likely to change.
 
2, using multi-bearing support, under the conditions of the axial position allows, each point using two or more bearings as a radial support, can improve the support rigidity. For example, in recent machine tool spindle components, several sets of radial thrust bearings have been widely used as shaft supports for the same fulcrum.
3, for the bearing matching surface requirements, the shaft and the bearing mounting position on the seat hole, the lower the surface roughness, the better the shape and position accuracy, the higher the support rigidity, the surface of the above surface treatment It helps to increase rigidity. Using high-rigidity stopper rods with very low roughness, with a certain amount of interference, gently pressing in and out of the seat hole in a lubricated state, it is also advantageous for improving the rigidity of the support, and if necessary, a snap ring can be used to treat the journal similarly. .
 
4, the use of bearing preloading method to improve the support rigidity, axial preloading method for ball bearings or tapered roller bearings, and radial preloading method for short cylindrical roller bearings, can significantly improve the rigidity of the shaft support At this time, either the bearing clearance is eliminated or a small negative clearance is obtained. However, under the condition that the rotational speed is not too high and the temperature rise is not large, it is better to adjust to a negative negative clearance condition.
When applying preloading, it is advisable to constantly measure the deformation. Note that in the low value stage of deformation, the deformation is nonlinear with the increase of the preload, and in the high value stage, the increase of the deformation with load is linear. Once the deformation has a linear relationship with the load, it immediately stops increasing the preload, and a constant stiffness can be obtained. After that, there is a fixed relationship between the axial rigidity and the radial rigidity of the bearing, and it does not depend on the applied load.
The above-mentioned deformation amount measurement can use, for example, the dial gauge head against the bearing end surface or an appropriate part of the shaft, and observe the method in which the reading changes with the preload. The preloading method has its disadvantageous aspects, such as increasing the friction torque of the bearing, increasing the temperature rise, shortening the service life, etc. Therefore, it is necessary to consider comprehensively, weigh the gains and losses, and select an appropriate preload amount.