Development and Realization of Set-up and Control Technology of NSSMC Intelligent Mill

Abstract

Operational scheme and flatness control algorithm with related mathematical models are developed for OPL (Oita Plate Leveler) which is a large scale embodiment of the NSSMC Intelligent Mill (NIM); NIM is a new concept rolling mill which can estimate and control roll force distribution across the width acting between the work roll (WR) and the rolled material. For zero adjustment procedure of individual position control system of divided back-up rolls (BURs), force distribution of the BURs minimizing the WR horizontal deflection is calculated by means of Lagrange’s method of undetermined multipliers, and systematic way of realizing the target BUR force distribution is developed. Considering plan view inclination and temperature distribution of inlet material, flatness control algorithm is developed and practiced to obtain desired flatness as well as residual stress of the rolled material after cooling.