A Graph-Based Method Of Machining Features Recognition For Boundary Representation Models

The integration of CAD and CAPP is one of the foundations of the integration of application systems in the enterprise, and machining features recognizaion is the key of CAD and CAPP integration. This paper describes an AAG(Attributed Adjacency Garaph) based method of machining features recognition for shaft kind parts and 2.5D parts on the ACIS platform, which can effectively recognize the main and assistant feature of these kinds of parts. Using the class library provided by ACIS, all the geometrical information for defining a feature can be acquired. Finally a XML neutral file describing the recognition result is provided for the later CAPP process and the generation of NC code. The method above can provide a promising way to solve the integration of CAD/CAPP/CAM problem.The emphasis of this paper is as follows:Firstly, the definition and classification of feature, also the main methods of feature recognition and their application are analyzed, in which the theory, algorithm and realization of AAG based method of machining features recognition is studied emphasized.In order to recognize the machining features of shaft kind parts and 2.5D parts, this paper presents a method based on AAG for them respectively, in which the process of machining features recognition of these kinds of parts is studied.Based on AAG, a prototype system on the ACIS platform is developed, which can recognize machining features of shaft kind parts and 2.5D parts automatically. The interface and concrete operations of the prototype system and results of machining features recognition are illustrated by examples, in which there is a typical shaft, a 2.5D part without conicoid and a 2.5D part with conicoid.