Development of a parametric computer-aided die design system for cold forging

Based on die-design flow charts and data bases collected from the literature, the collected flow chart and data bases of die design, the present paper develops a computer-aided die design system using Auto-Lisp. The design characteristics of the die elements and the die assembly have been expressed in parametric form and programmed. The proposed system has an open architecture, therefore, according to the system structure, die-design engineers can extent the die element design data base and programs. So far, three die-design modules have been finalised, namely: forward extrusion; upsetting; and combined extrusion. With the aid of the proposed system, the functions of die element design, die assembly design, automatic graphics and dimensions generation, redesign, dimension constraint correlations and bill of materials will provide efficiency and convenience of die design.