Analysis of Roll Torque in Profile Ring-Rolling of L-Sections

Summary

A method of analysis is proposed for the profile ring-rolling of L-sections. A kinematically admissible velocity field is derived by assuming an adequate plastic region in the normal range of operation. The upper-bound method is then applied to determine the roll torque of the driven roll. The roll torques are calculated for some process variables. Experiments are carried out for aluminum alloy (A1 2014) at the elevated temperature. The experimental results are then compared with the theoretical calculations. Both the experiments and the theoretical calculations show that the torque has a maximum at the moment the rib is constrained by the roll surface and the torque decreases afterwards.