ABSTRACT
Low-end manufacturing industries such as resourceintensive, labor-intensive, high-energy-consuming, and high-polluting industries have experienced sluggish growth. However, recently, computer hardware and software technology and related control technology have been widely promoted and used. A number of new technologies and new crafts are widely used in traditional manufacturing. They promote the transformation and upgrading of production methods (Zhang. S. H & Jensen. M. R., 2000). Because of the lightweight and high quality of the parts, the technology of hydroforming has attracted more attention in sheet metal forming.
