Overlap at the back and front end in slab ingot rolling

Abstract

Overlap formed at the back and front end in slab ingot rolling is studied theoretically and experimentally. The phenomena are analysed by means of plane strain upper bound solutions for a rigid perfectly plastic material. According to theory the crop loss volume at the front end should be larger than that at the back end. It is concluded that large roll diameters should be used in order to minimize the crop loss. For heavy reductions and large roll diameters the dependence of reduction on the crop loss at the back end is small. The dependence of roll radius is found to be more pronounced for the front than for the back end especially when heavy reductions and small roll radii are concerned. Theory is in good agreement with experiments carried out with plasticine as the model material.