Per: CRISTOVAO NERY GIACOMIN (USINAS SIDERURGICAS DE MINAS GERAIS SA), Priscila Batista Dias Souza (Usiminas), RODRIGUES TEIXEIRA DA CRUZ (USIMINAS)
Abstract:
The roughing mill is an initial stage to forming in a Hot Strip Mill (HSM), responsible for the dimensional adjustment, finishing train input temperature and the shape/ flatness to the slab. The roughing mill in Usiminas Ipatinga uses a mathematical model for calculating the initial rolling conditions (Setup), for speed and opening of horizontal and vertical rolling mill cylinders (gap). The width variations in slab and lateral spread during deformation are complex parameters to adjust and control in the final dimension width within the customers tolerances products, due to the width reductions made by vertical rolling. Also the shape accuracy contributes directly to maximize the rolling performance in the subsequent processes, and the best way to do this is through the setup model of the rolling mills, considering in advance the lateral spread phenomenon for the calculation of the vertical rolling mills opening. In this way it is possible to minimize the operator interventions in the gap, to correct the width. In this work, improve this results for the adjustment setup model by vertical rolling will be presented, as well as the uniformity improvement values to obtained width.