Optimization design of CT machine bearings considering rotational accuracy
Based on the friction torque model,rated life model and rotation accuracy model of a certain type of CT machine bearing,a joint optimization model is built to reduce bearing friction torque,improve bearing rated life and rotation accuracy by Isight combined with Matlab.Our results show through increasing the number of rolling elements,decreasing the amplitude of bearing roundness error and the order of bearing roundness error,the bearing rotation accuracy is improved for bearings with the number of rolling elements much larger than the order of bearing roundness error.After optimization,the coefficient of curvature radius of the inner ring groove is 0.5277,the coefficient of curvature radius of the outer ring groove 0.5351,the diameter of the steel ball 12.7 mm,the number of steel balls 157,and the initial contact angle 42.96°. Compared with the initial parameters,the rated life of the bearing is increased by 6.6％and the total friction torque of the bearing is reduced by 18.9％ while the rotation accuracy is guaranteed.
CT machine bearingsfrictional torquerated liferotation accuracyjoint optimization model
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NSTL
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