Vibration Characteristics Analysis of Spindle Bearings for High-Speed Precision Machine Tools
As the core supporting part of the spindle of high-speed precision machine tools,the vibration performance of the spin-dle bearing is very important to the machining accuracy and efficiency of the whole machine tool.However,due to insufficient design of the bearing at high speeds,it is difficult to effectively solve the problems of decreased processing accuracy and shortened equipment life caused by vibration.Taking a specific model of angular contact ball bearing as the research object,a rolling bearing dynamics analysis model was established,and the study on the vibration characteristics of the spindle bearing for high-speed precision machine tools was conducted based on the model.An experimental platform was designed and built to carry out vibration test verification of bearings.The results show that increasing the curvature radius coefficient of the inner ring will increase the vibration acceleration level,and increasing the curvature radius coefficient of the outer ring will decrease the vibration acceleration level.The influence of curvature radius coeffi-cient of outer ring groove on vibration acceleration level is more significant.By setting the appropriate radial load,axial load,and the in-ner ring speed range,the vibration acceleration level during the driving of the angular contact ball bearing can be reduced.According to the experimental results,the theoretical analysis of the axial reception acceleration level and the experimental value error is 8.33％,and the accuracy of the simulation model was verified.
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