This paper discusses the methodology in developing a 3D CAD system for injection mold. There are hundreds of parts in a set of mold, these parts can be classified and managed by an assembly method. The assembly tree structure can be looked upon as a reverse tree, each branch represents a sub-assembly tree structure, and leaves are part files. The parts are created by parametric geometrical model, parameters are used to control part size. A linkage between geometrical model and part database was built up to load the standard parts automatically. Associations are created among these parts by referring parameters with each other. A version management method is discussed to keep design status and restore to previous design as necessary. Mold design specification functions such as parting, cooling, mold base, insert creation are also provided to designers. A knowledge-based 3D CAD system is currently being used in the local mold design and manufacturing companies.

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