飞机结构件加工域单元分层识别及构造方法

加工域的自动识别是自动数控加工编程的关键技术之一。为实现飞机结构件自动数控加工程序编制过程中工序件加工域的自动识别,建立了加工域模型,提出了一种实用、可行的域元分层识别方法。首先,根据工序件构建分层面,截切零件和毛坯;其次,依据层交结果构建层域元轮廓,生成层域元;然后,建立规则合并层域元生成域元;最后,通过匹配域元间纵向关系,构建域元树状模型。通过对飞机结构件的测试,证明了该方法的有效性和实用性。

Slicing Recognition of Machining Volume Unit for Aircraft Structural Parts

Automatically recognizing the machining zone is one of the key technologies of automatic NC programming. To automatically recognize the machining zone of working procedure parts during the NC programming of aircraft structural parts, the model of machining zone is established and an available and feasible feature recognition approach is proposed as follows： firstly, slicing the part and blank with slicing planes which are constructed according to the working procedure parts; secondly, the feature profile is created according to the result of slicing, and then the machining volume units between the slicing planes are constructed; thirdly, the features are constructed by combining the units between planes based on the rules which are created previously; finally, through matching the vertical relationships among the features, a feature relationship tree is constructed. Through testing large number of aircraft structural parts in NC programming system, the validity and practicability of the method have been verified.