熱延仕上ミルにおける板厚セットアップモデルの精度向上

Abstract

To improve thickness accuracy in hot rolled strips, accurate mathematical set-up models for estimating rolling loads and strip speeds in hot finishing mills are investigated. For the set-up models, equations of deformation resistance, and coefficients of friction are proposed here.(1)Uniaxial deformation resistance is measured in compression tests. Dynamic softening, accumulated strain, and other factors are considered in the equation for deformation resistance.(2)Coefficients of friction in rolling are estimated from forward slip and distortion of the cross section of hot rolled specimens. The values estimated by these two methods agree with each other. The coefficient of friction is expressed as a function of scale thickness and rolling reduction.These equations were put to an actual operation of hot strip finishing mills in Mizushima Works, and accurately predicted rolling loads. As a result, the thickness accuracy in hot rolled strips has been improved.