Load and torque determination for hot flat rolling with variable frictional conditions

Abstract

Graphs are presented which enable load and torque in hot flat rolling to be evaluated for different levels of the coefficient of friction in the roll gap. The C^p and C^g functions obtained from graphs given below may be used as direct replacements for the C^p and C^g values in the BISRA method by Cook and McCrum for load and torque calculation, which assumes sticking of the metal to the rolls throughout the roll gap. Guidance is given upon the choice of the effective coefficient of friction to be used, and graphs are given for the angles ϕ_r, and ϕ_b at which sticking ends and sliding begins (when considering movement outwardfrom the neutral angle ϕ_n).