【摘要】 针对快速数控编程系统中不同CAD模型的特征识别和构建,论述了基于STEP文件的特征识别技术及其实现过程:首先利用词法分析器解析STEP中性文件,按照STEP的文件拓扑结构生成属性邻接图(AAG);在总结典型结构件拓扑特征基础上,结合数控编程切削逻辑,以切削级为基础进行特征识别和特征构建;最后以XML形式构造制造特征森林以供CAM系统使用。实例证明了文中方法的有效性,提高了结构件数控编程的效率和质量。更多还原

【Abstract】 Aiming at recognition and reconstruction of features from different 3D CAD models,this paper presented the implementation process of feature recognition.Firstly,an attributed adjacency graph(AAG) created of geometry and topology in STEP file by lexical analysis.According to the analyses on machining features of structural parts in terms of the NC programming cutting logical,the machining feature will be recognized and reconstructed.The machining feature are provided by XML,which can be used by CAM system.Case study validates the proposed method,which improves efficiency and quality of NC programming of structural part.更多还原