Modeling is to specify, visualize and document models of application systems including their structure before actual implementation. This paper attempts a system level modeling for sheet metal process planning for integration purposes. Many attempts have been made in the past proposing sheet metal process planning systems at implementation level based on product data models. However, process planning activity is knowledge intensive. An effective system is possible only if both data and knowledge models form a basis for it. This paper describes modeling a sheet metal process planning system before actual implementation, with data and knowledge models as a basis. Previous attempts at sheet metal process planning concentrated only on implementation and limited categories of data models. Moreover in these attempts data and knowledge models have been proposed without attempting to relate the two. The same have been over come in the present work. A frame work consisting of data and knowledge models for process planning is also proposed and discussed.

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