Research on high precision profile control technique of silicon steel for UCM tandem cold rolling mill

Abstract

UCM cold rolling mill has strong ability of crown and flatness control, but it seriously lacks the edge drop control ability. In this paper, an explicit dynamic finite element method is adopted to build a combinatorial simulation model for roll stacks and strip, based on the 4-stand PL-TCM cold rolling mill of Masteel. Then the method of optimizing the intermediate roll shift position is proposed to reduce transverse thickness deviation along the strip width of silicon strip. In addition, U-EDC work roll contour which was independently designed was introduced. The result of the new strip shape control technology's application shows that average edge drop of silicon steel strips is less than 5µm, and the proportion of the transverse thickness deviation along the strip width direction less than 10µm reaches 98.7%. Those new technology accomplish high precision profile control in 6-high mill which has no work roll shifting.