Characteristics of backup roll wear contour in a CVC continuous hot rolling mill

The configuration of dissymmetrical CVC work roll contour and symmetrical conventional backup roll contour results in bad self-maintenance of backup rolls in downstream stands. After the analysis on the effects of backup roll wear contour in No. 4 stand on the profile control and roll contact pressure distribution by ANSYS finite element method, it was found that the severe wear of the backup roll affected the controllability of the mill for the profile and flatness of products, and led to the spalling accident of the backup roll, which may increase roll consumption. Based on the ANSYS analysis, a new backup roll contour was proposed, which was proved of good self-maintenance by experiment, and could work well during the whole service period, especially could mitigate the roll contact pressure peak of backup roll wear contour.