Numerical study of combined process of backward cup extrusion and piercing

A reduction of material usage of cold forged components while maintaining the functional requirements is put into effect using hollow or tubular preforms. These preforms are used to meet lightweight requirements and decreased production costs of cold formed components. In order to increase efficiency of manufacturing the combined forming process “manufacturing of hollow preforms by combining the processes backward cup extrusion and piercing” was established and will be discussed in this paper. This investigation consists of the numerical identification of substantial process input variables, process outcomes, and the process limits with regard to combined forming processes in the field of cold forging. The numerical results which are relevant for further experimental studies and the influence on the produced preforms as far as surface quality and diameter tolerance are concerned will be presented in this paper. Thus, an outlook of the experimental studies will be given.