关键词: 数控机床, 故障诊断, 图论, 多故障传播模型

Abstract: According to the complex natures of fault diagnosis for CNC machine tool,the fault diagnosis based on graph theory was researched.The multi-fault propagating model was proposed to represent these complex natures by characterizing the relationships of fault propagation,and this model would be processed by the matrix algorithm and the hierarchy algorithm.The priority of source faults was sorted by the risk-based fault localization algorithm.The effectiveness and correctness of proposed method was proved by a case of ram feed system of CNC boring machine tool FB260.

Key words: numerical control machine tool, fault diagnosis, graph theory, multi- fault propagating model