A slab model for ring rolling

Abstract eng:
A slab model with non-vertically aligned contact points is coupled with an elastic model of a split ring to model ring rolling. The slab model uses rigid plasticity and Coulomb friction. The workpiece is assumed to be at yield on the rolls and locally has circular free surfaces otherwise. The choice of four contact points and two neutral points are used to satisfy force and geometry end conditions within the roll bite. A variable thickness and variable curvature beam model approximate the split ring. End conditions for both models must be compatible, producing a coupling between the two models. Additionally, to time step through the process, the plastic deformation within the roll gap must be estimated and tracked to update the unstressed thickness and curvature of the outer model. Comparisons will be made to finite element simulations for a range of parameters and several methods of curvature prediction.

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