Transformation Technology from Part Design Model to Blank Model

To integrate CAD, CAPP and CAM, the thought of transforming part design model to blank model thus to manufacturing model was presented. The part design modeling is to get rid of features from blank model, while blank modeling is to add features to part design model and compensate for the surplus of processing. The blank modeling built geometric model according to the information from part drawing or CAD system. On the other hand, the information was also obtained from geometric model database by using feature-identification technology. Then, some segment of geometric model was compared with the predefined feature model from database, and the case with matching feature was recognized. After abstracting the identified feature, the features' parameters were confirmed and the geometric model of the feature was completed. The high-level features were acquired by combining various features. Furthermore, the information of blank was derived and the blank model was output. This kind of blank model is still related to the original part design model and keeps data consistency when the original design model is modified.