Development and Application of Linearly Variable Crown Work Roll in Hot Strip Mills

In order to improve profile and flatness performance of rolling mill,linearly variable crown(LVC)work roll of hot s trip mills and its relevant shape control models are developed on the basis of full understanding of shape control characteristics of continuously variable crown(CVC)technology.Shape adjustment capacity of LVC technology varies linearly with roll axial s hiring and it also has approximately linear relationship with strip width.Besides meeting the need of shape control of wide strip,LVC technology can increase mill shape control capacity of narrow strip greatly and make bending forces more proper for all specifications strip.LVC technology is used on 1 700 mm industrial wide strip mills for more than one year and control precision of strip profile and flatness is improved more than 30%.Especially to high strength steel grade,crown after rolled is reduced evidently. The rolling length in one unit normally surpasses 55 km.In addition,wear contour and roll consumption are the same as conventional work roll.