Custom-tailored product; Convex hull; Shape similarity assessment

This paper describes a research work of developing computer-aided design of product with bending and piercing operation for progressive working. Approach to the system is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories, experimental results, and the empirical knowledge of field experts. The system has been written in AutoLISP on the AutoCAD with a personal computer. It is composed of four main modules, which are input and shape treatment, flat pattern layout, strip layout, and die layout modules. The system is designed by considering several factors, such as bending sequence by fuzzy set theory, complexities of blank geometry, punch profiles, and the availability of a press equipment and standard parts. The strip layout and die layout drawings automatically generated by formularization and quantification of experimental technology will make minimization of trial and error and reduction of period in developing new products. Results obtained using the modules enable the manufacturer for progressive working of electric products to be more efficient in this field.