Abstract
This paper proposes a hierarchical CAPP (computer automated process planning) system architecture for die cavity machining. The CAPP system structure has been developed on the basis of the current practices of die cavity machining and is composed of five modules — Form EDM, Clean-up, Finish, Semi-finish, and Roughing planning. The individual CAPP modules are connected in a sequential manner They are identical in structure and each module consists of four sub-functions for feature extraction, process planning, machined surface update, and NC-code generation. Input to the CAPP system are 1) a CAD model of the die surface geometry, 2) the geometry of the raw stock, and 3) a set of available cutting tools with machinability data. Output from the CAPP system is a set of NC-codes. A process plan example, which is generated by a prototype CAPP system developed on the proposed structure, shows that the proposed CAPP architecture is practical and valid in the die cavity machining.
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