Shape Factor of Calibers in Rolling of Structural Sections

Abstract

A new equivalent rectangle method has been developed and the factor depending on shape of sections has been determined in caliber rolling of structural sections. To confirm the correctness of this method, the calculated results of ratio of torque/force in various calibers have been compared with those obtained from measurements of roll force and power. It may be applied with sufficient accuracy for calculation of roll force and power. For a condition of the practical hot rolling, the following values appear to give the best results: average coefficient of friction μ=0.15, average angle of friction cosφ=0.65, efficiency of deformation η=0.35, average lever arm ratio λ₀=0.37.