Viewpoint that using the identification quantity to identify the long ear disfigurement was brought up, and by calculation, it can be deduced that identification quantity should be set as the quantity of long ear disfigurement of the position which is about 0.2 times of plate width to the plate border. Conception of plate head tiny cell was brought up, and the long ear disfigurement was uncoupled into the product of elongation percentage and length of tiny cell. On the base of prediction of long ear disfigurement, process control model of MAS rolling was built up, and application indicates that it can fit the on-line producing and eliminate the long ear disfigurement commendably
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