数控磨床头架系统的FMECA和FTA可靠性分析∗

摘要

Considering reliability of current domestic CNC grinding machine is low. With a series of CNC grinding machine of a machine tool plant production as research object for reliability analysis. After analy-zing failure data collected in the field can know head frame system is the highest of failure rate in the series CNC grinding, and The article analyzed the head frame system fault data by using FMECA and FTA meth-ods. Through FMECA analysis of head frame system, calculated the harm of head frame system for CNC grinding machine was 0. 003344169. Through FTA analysis of head frame system, determined minimum cut sets and cause of the failure of head frame system. In order to improve the reliability of CNC grinding ma-chine, this paper puts forward some improvement measures through the analysis of the failure data, is of great significance for improving reliability of the domestic CNC grinding machine.%鉴于目前国产数控磨床可靠性较低，以某机床厂生产的某系列数控磨床为研究对象，进行可靠性分析。经过现场采集的故障数据分析可知头架系统是该系列数控磨床发生故障率最高的系统，并对头架系统故障数据进行了FMECA和FTA可靠性分析。通过对头架系统的FMECA分析计算出头架系统对数控磨床的危害度为0.003344169。通过对头架系统的FTA可靠性分析确定了头架系统的最小割集和发生故障原因。为提高数控磨床的可靠性，经过故障数据的分析提出了几点可靠性提升方案，对提高国产数控磨床可靠性具有重要意义。