Improving the Method of Calculating the Critical Stresses and Strains in Strips Rolled in the Edging Rolls of a Universal Mill

Resumo

The effect of elastic, plastic and elastoplastic models on the accuracy of the calculated critical stresses and strains of copper strips hot-rolled in the edging rolls of a universal two-high mill is studied. It is shown that using elastoplastic models improves the accuracy of the calculated critical stresses by a factor of 150 to 200 and the accuracy of setting up the sheet mill to ensure rolling stability. Analytical equations for calculating the critical compressive stresses for various rolling conditions are derived. The critical compressive stresses and strains are calculated to find their permissible values ensuring the stability of a copper strip hot-rolled in the edging rolls of an 850 × 1000 universal mill.