For a consistent die casting product design database, the die geometry should be generated from and be associated with the original part design. However, the original part design must be modified to include several process specific features, e.g. parting line, drafts, and rounds/fillets, before the creation of the die cavity. This paper deals with the incorporation of automatic/semi-automatic geometric modifications with drafts and rounds/fillets in a CAD system to smooth the transition from part design to die design. The underlying physical concerns behind these local geometric modifications are studied. The significant geometric characteristics in determining the appropriate size of drafts and rounds/fillets are then identified and extracted with geometric reasoning methods. This paper also presents the problems should be noted in applying these modifications to a die casting design.

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