Dynamic roll gap control during flexible rolling of metal strips

A method for dynamically controlling a roll gap during flexible rolling of metallic strip material with the steps:

• defining a nominal thickness profile with defined nominal corner points and profile sections lying between the nominal corner points, wherein nominal intermediate points are defined on at least a partial number of the profile sections lying between the nominal corner points, and wherein respective two profile sections adjoining a nominal corner point have different mean gradients;
• flexible rolling the strip material so as to produce a plurality of recurring strip portions according to the nominal thickness profile;
• measuring an actual thickness profile of one of the recurring strip portions of the flexible rolled strip material and determining actual corner points corresponding to the nominal corner points, and determining actual intermediate points corresponding to the nominal intermediate points;
• comparing the nominal corner points with the corresponding actual corner points and determining respective corner point comparison values from the nominal corner points and the corresponding actual corner points;
• comparing the nominal intermediate points with the corresponding actual intermediate points and determining respective intermediate point comparison values from the nominal intermediate points and the corresponding actual intermediate points;
• and
• controlling the roll gap during flexible rolling of another one of the recurring strip portions depending on the corner point comparison values and the intermediate point comparison values of the one of the recurring strip portions.