SENSITIVITY ANALYSIS OF 4-HIGH ROLLING MILLS WITH ROLL BENDING

The present paper applies a sensitivity analysis for 4-high rolling mills with roll benders in order to analyse the behavior of the crown of strips. Some operational and equipment parameters were varied and its result on the strip crown were observed. Also is presented a study on the strip flatness, as this is intimately related to the variation of the strip crown in a pass. A computational simulator validated with technical literature was applied, named MCI-Berger. One of the advantages on using a simulator is the possibility to variate one parameter, keeping steady all the others. The strip crown increases when the strip width is increased, but this behavior reverts after a certain width. The strip crown is more sensitive to the crown of the work roll than the crown of the backup roll. When the diameter of the roll is varied it is observed that it depends on the width of the strip. The larger the strip width, the bigger the influence of the roll bending force on the strip crown. It was concluded, also, that the absolute crown is proportional to the rolling load for strip widths up to 80% of the length of the rolls.