In a computer-aided injection mould design system, the generation of parting surface and the creation of core and cavity blocks is usually a bottleneck. The parting surfaces and core / cavity blocks are created based on the parting direction and parting lines. Here, the architecture of an injection mould design system is proposed on the basis of the practical information flow and processing steps in mould production life cycle

In this architecture, the methodology to generate the parting surface and the core / cavity blocks is proposed. To generate the parting surfaces, the parting lines edges are classified and the extruded directions specified to the different group of parting line edges.

Extruding the parting lines edges to the boundary of the core / cavity blocks,the case studies illustrate and validate the methodology to generate the parting surfaces and core / cavity blocks.