Strip profile control method of hot finishing tandem rolling mill and hot finishing tandem rolling mill

A hot finishing tandem rolling mill, comprising:

• a plurality of stands;
• a plurality of reduction devices and a plurality of strip shape control actuators that are respectively provided at each one of the plurality of stands;
• a decision control device configured to decide a predetermined pass schedule;
• and
• a rolling mill control device configured to control the reduction devices and the strip shape control actuators based on the predetermined pass schedule decided in the decision control device,
• wherein:
• the decision control device is configured to decide the predetermined pass schedule by adjusting rolling force per unit width at a last stand of the hot finishing tandem rolling mill to cause an edge-up or edge drop on an outlet side of the last stand to fall within a predetermined range based on a relationship between a strip crown and the edge-up or edge drop on the outlet side of the last stand with respect to the rolling force per unit width and a flatness control parameter, obtained regarding the last stand, and configured to adjust the flatness control parameter of the last stand to cause flatness on the outlet side of the last stand to fall within a predetermined range and cause the strip crown to become a predetermined value or smaller, and
• the rolling mill control device is configured to control the reduction devices to obtain the adjusted rolling force per unit width at the last stand and control the strip shape control actuators to obtain the adjusted flatness control parameter of the last stand,
• wherein the flatness control parameter includes at least one of a work roll bending force of a work roll bender of the last stand, a roll cross angle of the last stand, or an amount of roll shift of the last stand.