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Title

TEC3 WORK ROLL THERMAL CROWN MODEL FOR HOT AND COLD ROLLING OF STEEL

Authorship

LEGRAND, Nicolas; SOUTO, Nelson; ABDELKHALEK, Sami; KOONT, Zafer

LEGRAND, Nicolas

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SOUTO, Nelson

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ABDELKHALEK, Sami

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KOONT, Zafer

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DOI

10.5151/9785-9785-32510

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Abstract

A work roll thermal crown model has been developed for a wide range of hot and cold rolling mill applications. The model is extremely fast, robust and accurate to determine the evolution of thermal crown all along the rolling campaigns. It has also ability to consider work roll shifting, multiple segmented cooling zones along the length and circumference of the roll as well as composite rolls properties (e.g. different thermal properties between mandrel and core of the roll). Moreover, the model includes simultaneously fast and slow temperature evolution calculations, respectively near roll surface (skin area) and at a certain distance below the roll surface (bulk area). This gives to thermal crown predictions a higher accuracy than conventional thermal crown models from literature that consider only the slow temperature evolution regime. An optimization procedure together with roll surface temperature and roll thermal profile measurements have been used to tune the model. The tuned model applied to hot rolling conditions has shown a significant influence of roll shifting and composite rolls properties on the prediction of roll temperature distribution and thermal crown during rolling. The tuned model applied to cold rolling conditions highlights the importance of mill operators practices to modify cooling distribution across roll barrel length with the segmented cooling zones to adjust the thermal crown and to get better strip shape control

Keywords

Cold rolling; Hot rolling; Thermal crown; Composite roll