针对飞机结构件零件尺寸大、加工特征类型数目多，零件结构复杂、包含大量自由曲面和相交特征，薄壁易变形及精度要求高等特点引起的加工工艺决策难点，提出了基于特征与MKE的飞机结构件工艺决策方法。首先对商业软件NX系统的MKE技术进行了调研分析，在此基础上构建了基于特征的飞机结构件加工工艺知识编辑器框架，基于CATIA V5开发了具有用户界面友好的加工工艺知识编辑器，在特征识别的基础之上，通过调用工艺规则模板库、刀具库、用户自定义信息等完成工艺决策。应用表明，该方法能够有效提高工艺决策系统的灵活性以及飞机结构件数控编程效率。%Aiming at the process planning difif-culties which is caused by the large dimensions, numerous machining features, complex structure, plenty of free form surface and geometrical interactions, thin wall and high accuracy of the aircraft structural parts, the feature-and-MKE-based process planning method is proposed. Based on the research of MKE technology of NX software, the feature-based framework of machining process knowledge editor is constructed and a machining knowledge editor with friendly user interface by CATIA platform is devel-oped. According to the feature recognition, the method applies the process template library, the tool library and user-deifnition-information to achieve the process planning according to the feature information. The practice shows that the method can effectively improve the lfexibility of the process planning system and the efifciency of the NC programming for the aircraft structural parts.
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