Abstract: Artificial construction of 3D process model need great human effort.Aiming at this problem,an automatic generation method of 3D process model was proposed.The 3D design model of the part was preprocessed,the extended feature relation graph was employed to express it structurally,and the candidate cut-cutoff surface sequence and processing method chains were generated.The machining volume was obtained by Boolean operation of the blank model and the part model,and then the machining volume was divided into a set of machining unit volumes by mapping and segmentation operation.The machining feature mapping method was employed to realize the association between the machining unit volumes and the machining process to generate the 3D process model.The proposed method was verified by experiments with typical shaft parts.

Key words: shaft parts, volume de.composition, machining feature, 3D process model, extended feature relation graph

摘要： 针对三维工序模型需人工构建、工作量大等问题,提出一种三维工序模型自动生成方法。首先对零件的三维设计模型进行预处理,采用拓展特征关系图对其进行结构化表达,生成候选分割面-截止面序列和加工方法链;然后通过毛坯与零件模型的布尔运算获取切削体,并应用映射分割方法对切削体进行分割,获得加工单元体组;最后通过加工特征映射方法,实现加工单元体与加工工序的关联,生成三维工序模型。通过典型轴类零件对所提方法进行了实验验证。

关键词: 轴类零件, 体分解, 加工特征, 三维工序模型, 拓展特征关系图