Research on ASR work roll contour suitable for all width electrical steel strip during hot rolling process

Abstract

For high precision profile and flatness control ability of electrical steel strip with different width during schedule-free rolling (SFR) campaign, the asymmetry self-compensating work roll contour, which is suitable for all strip widths (ASR-C) is developed. The effect of strip width on work roll wear is analyzed through experimental data. By combining shifting strategy and initial shifting position, the new asymmetry self-compensating work roll (ASR) contour is designed. Compared with the ASR work roll for narrow strip (ASR-Y), ASR work roll for wide strip (ASR-N), and conventional work roll, ASR-C presents well profile and flatness control ability for all strip widths during entire rolling campaign. The characteristics of ASR work roll can be fully reflected when ASR-C and its shifting strategy are used. Experimental results show that the ratio of strip crown (C40) less than 45 μm is increased from 41.8 to 98.2% by using the ASR-C work roll of the ASR mill type, compared with conventional work roll of the K-WRS (Kawasaki-Work Roll Shifting) mill type.