A software framework for intelligent CAD use in process planning

The function modeler presented in this paper was designed to extract product features for automatic process selection in applications most suited to vertical milling. This modeler works on principles of Boundary Representation (B-Rep), specifically Euler formula and Attributed Adjacency Graphs, and Constructive/De-Constructive Solid Geometry (CSG) modelling. Variations of the Adjacency Matrix and unique feature identification principles allow for the inclusion of interacting features. The product CAD data that is used within these principles is obtained from a neutral STEP file format, ensuring its compatibility amongst existing CAD programs. A recursive checking method, utilising Volume decomposition of a CSG model, is employed to ensure that a valid product model is developed, and thus consistent process plans can be developed every time.