Maintenance Importance Model of CNC Machine Tools Based on Natvig Importance

This paper discuss the application of maintainability importance analysis on the CNC machine tools on the basis of the maintainability model of CNC machine tools According to the characteristics of CNC machine tool repairable system, Natvig importance is introduced into the importance analysis of CNC machine tool. The maintainability models of CNC machine tool is established. The Natvig importance of maintainability model and probability importance of maintainability model are established, and the main parameters of the model are calculated. The bar chart of maintainability importance of each subsystem is obtained. At last, the importance sorting results of critical components conform to realities. Further the results could guide maintainability design, maintainability prediction and maintainability distribution.