"Apparatus And Method For Controlling Tension Of Rolling Material And Tendem Hot Rolling Machine"

Abstract: For performing tension control of a rolling material stably, when there is no abnormality in a load detected value obtained from a load detecting part 28, a pressure command correction amount learning part 3 learns a coefficient of a relational expression representing a correlation between a pressure detected value acquired by a pressure detecting part 27 and a first pressure command value correction amount based on a load detected value computed by a first pressure command correcting part 24. When a normal load detected value cannot be acquired by the load detecting part 28, a rolling material tension control apparatus 1 switches a pressure command value correction amount used by a pressure command computing part 20 from the first pressure command value correction amount computed by the first pressure command correcting part 24 to a second pressure command value correction amount computed by a second pressure command correcting part 25 on the basis of the correlation learned by the pressure command correction amount learning part 3. Since these correction amounts are correlated with each other, when the correction amount is switched, the correction amount does not substantially change. Therefore, tension control for a rolling material does not become unstable.

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