Automatic Manufacturing Process Planning Based On 3D Feature Model Of Part

CAPP, as the bridge between CAD and CAM, is an important part in CAD/CAM systems. However, in nowadays, most CAD/CAM systems are very simple when solving the process planning. Based on the blank model which is selected from various sizes of standard rectangular bars, they utilize the technology of machining feature recognition; they also extract the cutting areas and their machining process on the product models directly. And then the NC tool cutting locus is formed. Obviously, there is a long way for this method to reach its aim. Their disadvantages located that the blank models are too simple and the decision of process procedure is not perfect enough. The real machining procedures cannot be embodied. When machining after such kind row stocks, bad phenomena must come into being.Under such circumstance, this paper made further research on the converse technology from component 3D feature models to blank models, made great progress in the recognition and offset of simple features, and analyzed all situations of the complex feature recognitions. At the same time, based on the blank model which formed automatically by the system, this dissertation generated the forging blank model for machining, which represent the casting output in sufficient detail to support machining process planning. Then automatic achieved the technical constraint parameters of surface machining features and volumetric machining features following the blank model. Implemented the machining process planning based on manufacturing resources database and technical knowledge database.The research route of this dissertation started from the design model, transit to the blank model and reached the machining model with progress planning. With the compile software VB and the second development technology, a prototype system is completed based on the modeling software SolidWorks. This dissertation plays a great role in the integrity of CAD, CAPP and CAM.