CAJ | 학술논문

数控机床是复杂的机电一体化系统，其故障不仅包括由于机械磨损造成的性能退化失效，还包括电子器件等引起的突发性失效，数控机床故障是退化失效和突发失效竞争的结果．故本文假设突发失效和退化失效相互独立并且都服从Weibull分布，综合考虑突发失效和性能退化之间的相关性和竞争关系进行数控机床可靠性建模研究．采用最小二乘估计法估计模型参数，运用D检验法进行参数拟和性检验；得出了一种基于竞争失效模式分析的可靠性评估模型．最后，以15台某系列数控机床60个故障数据对该方法进行验证，说明了该方法的有效性和可行性．
수공궤상시복잡적궤전일체화계통，기고장불부포괄유우궤계마손조성적성능퇴화실효，환포괄전자기건등인기적돌발성실효，수공궤상고장시퇴화실효화돌발실효경쟁적결과．고본문가설돌발실효화퇴화실효상호독립병차도복종Weibull분포，종합고필돌발실효화성능퇴화지간적상관성화경쟁관계진행수공궤상가고성건모연구．채용최소이승고계법고계모형삼수，운용D검험법진행삼수의화성검험；득출료일충기우경쟁실효모식분석적가고성평고모형．최후，이15태모계렬수공궤상60개고장수거대해방법진행험증，설명료해방법적유효성화가행성．
The numericMly-controlled machine is a complicated electromechanical integration system, the failure mode of it includes not only performance degradation that caused by mechanical wear, but traumatic failure that is due to electronic device, and tile failure of CNC is the result of competition between degradation failure and traumatic failure. So the paper assumed that the traumatic and degradation failure are independent and obey numerically-controlled machine YVeibull distribution. Comprehensively considering the dependence and competitive relationship between the traumatic failure and performance degradation, the CNC reliability mode is studied. The model parameters are estimated with least-squares estimation, the model parameters fitting inspection are tested by correlation coefficient method and the reliability assessment model based on competing failure mode analysis is obtained. In conclusion, a case study of 15 CNC with 60 failures is given to valid the method, the results verify the effectiveness and the feasibility of the method.