哈尔滨工业大学学报（英文版）2007，Vol.14Issue(2)：197-201,5.
Time between failures model and failure analysis of CNC system
Time between failures model and failure analysis of CNC system
摘要
Abstract
To provide basis for the reliability improvement design of CNC system, the failure data of a type of CNC system in one year are collected under field conditions in workshops. The distribution model parameters of time between failures are estimated by least square method and hypothesis testing is done by d-test method. It is proved that the time between failures of the CNC system follows Weibull distribution and the system has entered into the wear-out failure period. The failure positions and failure causes are analyzed further to indicate the weak subsystems of the CNC system. It can be found that servo unit, electrical system, detecting unit and power supply are principal failure positions and the main failure cause is breakage of components. The corresponding improvement measures are put forward. The paper provides a reference to reliability design and analysis of CNC system for the manufacturer and has great guidance to using and maintaining CNC system for the user.关键词
CNC system/failure analysis/reliability/Weibull distributionKey words
CNC system/failure analysis/reliability/Weibull distribution分类
矿业与冶金引用本文复制引用
ZHANG Hai-bo,JIA Ya-zhou,ZHOU Guang-wen..Time between failures model and failure analysis of CNC system[J].哈尔滨工业大学学报（英文版）,2007,14(2):197-201,5.基金项目
Sponsored by the National High Technology Research and Development Program of China(Grant No. 2002AA424058) and the 10th Five-year National S&T Program of China( Grant No. 2001BA203B13-02). （Grant No. 2002AA424058）
