Modeling of Material Flow During Upsetting Between Parallel Pressure Plates
The upsetting of compact and ring-shaped work pieces is a well-known problem of plastic forming. Depending on the conditions of friction a work piece becomes bilge during upsetting. This paper demonstrates the mathematical modeling of material flow with respect to the coefficient of friction. In the presented solution the grade of bilge depends on a free parameter of the velocity field. The best value of this free parameter can be determined by minimization of the power requirement for the forming. By using the applied method the actual deformation of the work piece can be determined with good accuracy.
Keywords: metal forming, modeling, upsetting.