Modern Manufacturing Engineering ›› 2025, Vol. 532 ›› Issue (1): 121-127.doi: 10.16731/j.cnki.1671-3133.2025.01.015

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Research on preventive maintenance strategy for CNC machine tools based on log-linear process

REN Lina, WANG Ziqian   

  1. School of Mechanical and Electrical Engineering,Lanzhou University of Technology,Lanzhou 730050,China
  • Received:2024-07-16 Online:2025-01-18 Published:2025-02-10

Abstract: In response to the issue of high maintenance cost and the failure to fully utilize the remaining service life of the system during the maintenance of CNC machine tools,based on the Log-Linear Process (LLP),a new method for non-equal cycle imperfect Preventive Maintenance (PM) of Computer Numerical Control (CNC) machine tools was proposed. The hybrid failure intensity model of imperfect PM of machine tools under the LLP was established,and the expressions of the age reduction factor and the failure intensity increasing factor were given according to the empirical value method. With reliability as the constraint,the dynamic maintenance intervals under different PM thresholds and replacement thresholds were derived. Furthermore,the optimal number of PM times was given to minimize the average maintenance cost rate. The proposed method was validated using the spindle system of CNC machine tools as an example. Comparison analysis was conducted between the maintenance model without considering replacement threshold and the maintenance model with mixed failure intensity factors following a uniform distribution,the results indicated that the proposed method can effectively reduce maintenance costs while maximizing the remaining life of the equipment. The research results provide a new method for formulating a reasonable PM strategy for CNC machine tools.

Key words: reliability, CNC machine tools, Log-Linear Process (LLP), imperfect preventive maintenance, hybrid failure intensity

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