吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (6): 1946-1952.doi: 10.13229/j.cnki.jdxbgxb201606025

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Replacement time of system components of NC machine tools based on time-correlation

MENG Shu1, 2, SHEN Gui-xiang1, ZHANG Ying-zhi1, LONG Zhe1, ZENG Wen-bin1   

  1. 1.College of Mechanical Science and Engineering, Jilin University, Changchun 130022,China;
    2.College of Management, Jilin University, Changchun 130022, China
  • Received:2016-04-19 Online:2016-11-20 Published:2016-11-20

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Abstract: An analysis method of replacement time of system components of NC machine tools based on time-correlation is proposed. The aims are for making reasonable maintenance strategies and accurately estimating the stock of spare parts. First, taking the system components of NC machine tools as the research object, the trend and stability of the fault data are tested. Then, considering the correlation between the fault times of the components, the fault time sequence of the system components is modified by Johnson method. The failure process model of the system components is established through parameter estimation and hypothesis testing. Assuming that the failure rate of the test machine tool components obeys normal distribution, the index of replacement failure rate is estimated by fitting the confidence interval of normal distribution's low limit. Finally, the equipment maintainable time and spare part quantity for certain time can be calculated. A case study verifies that the proposed analysis method is practicable and effective.

Key words: machine tool, components replacement time, trend test, stationary test, Johnson method

CLC Number: 

  • TG659
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