A two dimensional upper bound analysis of the ring rolling process with experimental and FEM verifications

In this paper, an upper bound solution is used to determine the ring rolling power and force. An admissible velocity field and strain rates are derived from the parametric definition of streamlines in the deforming zone. Minimizing the upper bound power with respect to neutral point position, the neutral point situation and the rolling force are determined. The present method is validated using experimental results extracted from ring rolling mill. Moreover, using ABAQUS/Explicit software, the ring rolling process was simulated in every respect. Comparison of the present upper bound results with those from experimental study, finite element simulation and our previous slab analysis, have proved the accuracy of the present analysis. As compared with the FEM simulation, this method is very much quicker and less expensive and could be used as an engineering tool in the ring rolling industrial applications.