Abstract
Dynamically changing the machining condition and uncertain manufacturing resource availability are forcing the computer-aided process planning system to enhance the modification function of 3D process model. During the process planning, the process modification is an inevitable process activity for a new machined part. For updating the changed process models accurately and timely, this paper proposes a systematic method for the automatic update and propagation after modifying the process. Firstly, the process model is analyzed and decomposed into two parts: the process model information and the process attribute information. Secondly, based on the precedence relations of the process models in machining, the relationships among them are divided into two types: the dependency relation and the independency relation. Then, in order to ensure the validity of the changed process models, the determination method of the relationship among process models is proposed. Finally, the automatic update and propagation method of the process models is proposed by considering the relationships among them. The proposed method is verified by application of two examples.
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