刀库故障重要度分析与可靠性改进设计

The importance analysis of tool magazine fault and its reliability improved design

刀库系统的可靠性水平是衡量卧式加工中心先进性的重要指标。为有效提升刀库系统的可靠性水平,引进重要度和结构优化相结合的新方法。以某型号卧式加工中心刀库系统为研究对象,根据现场试验采集的35条故障数据信息,建立了刀库系统的故障树,通过故障树分析计算出了基本事件的重要度,并根据重要度值进行重要度排序。针对故障重要度大的基本事件,结合具体的换刀过程和故障原理,提出了结构优化可靠性设计,该设优化计方案经刀库系统设计人员验证具有可行性。

The reliability level of tool magazine is an important indicator to show how advanced a horizontal machining center is.To more effectively promote the reliability level of tool magazine,a new method combining importance and structure optimization is introduced.Taking tool magazine of a horizontal machinging as object,the fault tree of a tool magazine is established based on 35 failure data obtained from a horizontal machining center.Important levels of elementary events are calculated by fault tree analysis,and the order of importance is determined based on importance values.An improved design of structural reliability for elementary events with great importance is made according to failure principles and tool changing process.The feasibility of the improved design is verified by the designer of the tool magazine.