基于模糊故障树的某重型数控机床主轴系统可靠性分析  

Reliability Analysis of Spindle System of A Heavy-duty CNC Machine Tool Based on Fuzzy Fault Tree

作　　者：陈红霞[1,2] 王纪华 马爱博 郭春成 李宏悦 CHEN Hongxia;WANG Jihua;MA Aibo;GUO Chuncheng;LI Hongyue(School of Mechanical Engineering,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;Inner Mongolia Key Laboratory of Advanced Manufacturing Technology,Hohhot Inner Mongolia 010051,China)

机构地区：[1]内蒙古工业大学机械工程学院,内蒙古呼和浩特010051 [2]内蒙古自治区先进制造技术重点实验室,内蒙古呼和浩特010051

出　　处：《机床与液压》2022年第24期165-170,共6页Machine Tool & Hydraulics

基　　金：国家自然科学基金地区科学基金项目(51965051)。

摘　　要：为提高数控机床主轴系统的可靠性,找出主轴系统的薄弱环节,以某重型数控卧式铣镗床主轴系统为研究对象,建立以主轴系统故障为顶事件的故障树。由于时间和成本的限制很难得到基本事件故障率的准确值,因此结合专家判断法和模糊集理论,将专家意见汇总为梯形模糊数,确定出基本事件的发生概率,对故障树展开定性定量分析,并计算基本事件的重要度。最后通过基本事件的重要度排序结果,确定出影响系统的关键故障因素。In order to improve the reliability of the spindle system of CNC machine tools and find out the weak links of the spindle system,taking the spindle system of a heavy-duty CNC horizontal milling and boring machine as the research object,a fault tree with the spindle system failure as the top event was established.Due to the limitation of time and cost,it was difficult to obtain the accurate value of the failure rate of basic events.Therefore,combined with expert judgment and fuzzy set theory,the expert opinions were summarized into trapezoidal fuzzy numbers,and the occurrence probability of basic events was determined.Qualitative and quantitative analyses of fault tree were carried out,and the importance of basic events was calculated.Finally,the critical failure factors that affected the system were determined through the ranking results of the importance of the basic events.

关 键 词：重型数控机床主轴系统 模糊故障树分析 梯形模糊数 可靠性分析 

分 类 号：TG659[金属学及工艺—金属切削加工及机床] TB114.3[理学—概率论与数理统计]