Method for determining conformity of rolling roll, method for rolling metal strip, and method for producing cold-rolled steel sheet

A method for determining conformity of a rolling roll,

• the method being a method for determining conformity, in a rolling mill including one or two or more stands each having a plurality of rolling rolls, of a rolling roll to be evaluated optionally selected from the plurality of rolling rolls of an optional stand of the stands,
• the method comprising:
• a rolling load data acquisition step of acquiring rolling load operation data of the stand having the roll to be evaluated;
• a circumferential speed data acquisition step of acquiring circumferential speed operation data of the roll to be evaluated;
• a vibration analysis step of analyzing a vibration behavior of the stand using the rolling load operation data of the stand having the roll to be evaluated acquired in the rolling load data acquisition step;
• a surface shape estimation step of estimating a surface shape of the roll to be evaluated during rolling of a metal strip from an analysis result of the vibration behavior of the stand having the roll to be evaluated by the vibration analysis step and the circumferential speed operation data of the roll to be evaluated acquired in the circumferential speed data acquisition step;
• and
• a conformity determination step of determining the conformity of the roll to be evaluated based on the surface shape of the roll to be evaluated estimated by the surface shape estimation step.