An Integrated Design and CAPP System for Cold or Hot Forging Products

Abstract

This paper deals with an automated computer-aided process planning system by which designers can determine operation sequences even if they have little experience in process planning of bulk metal products by press working. The approach to the system is based on knowledge-based rules and a process knowledge base consisting of design rules is built. Knowledge for the system is formulated from plasticity theories, empirical results and the empirical knowledge of field experts. Programs for the system have been written in AutoLISP for the AutoCAD using a personal computer. An attempt is made to link programs incorporating a number of expert design rules to form a useful package for process planing. This integrated design and computer-aided process planning (CAPP) system is composed of two main modules and nine submodules. It is designed considering several factors, such as the complexities of blank geometry, punch and die profiles, the availability of press equipment, and standard parts. Results obtained using the modules enable the designer and manufacturer of cold forging or hot forging dies to be more efficient in this field.