Reliability Study of Electric Spindle Based on Multi-performance Degradation Parameters
Taking CNC machine tool grinding electric spindle as the research object,the reliability theory of multi-performance degradation parameter was used to study the grinding electric spindle.The failure mechanism of grinding electric spindle was analyzed,the performance degradation parameters were selected,the performance degradation model was established,and the reliability evaluation method for electric spindle based on multi-performance degradation parameters was proposed.By setting up a test bench,the test sample data of performance degradation parameters were collected,the reliability variation law of the electric spindle was predicted,and the reli-ability method based on multi-performance degradation parameters was compared with Bayes method which based on single performance degradation parameter.The results shows that the method based on single performance degradation parameter often overestimates the life of electric spindle,and the method based on multi-performance degradation parameter is more practical.The proposed method can pro-vide reference for the reliability evaluation of electric spindle of CNC machine tool.
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