Method for continuously rolling variable-thickness steel plate

The present invention relates to a continuous rolling method of variable thickness steel plate. Said method includes the following steps: firstly, making head portion and tail portion of steel plate respectively have a certain margin for rolling out smallest thickness, according to rolling force model calculating workpiece precalcutation plastic curve, then combining the plastic curve with rolling mill bounce curve to define roll gap of rolls, then making rolling operation under the roll gap; in the rolling process of head portion calculating rolled length until the rolled length is equal to L1; after the head transition stage rolling operation is completed, continuously making varial thickness rolling operation; according to the change of variable thickness rolled length making correspondent regulation of roll gap; continuously making above-mentioned rolling process until the variable thickness stage rolled length is equal to L, at the moment, the thickness of workpiece is transited to largest thickness, then making tail portion rolling operation, based on the deviation between precalculation plastic curve and actual plastic curve regulating gap position to eliminate the deviation until the tail portion rolling operation is completed.