CONTROLLING SYSTEM FOR TENSION OF MATERIAL TO BE ROLLED, CONTROLLING METHOD FOR TENSION OF MATERIAL TO BE ROLLED, AND HOT TANDEM ROLLING MILL

摘要

PROBLEM TO BE SOLVED: To be capable of stably performing tension control even if a control input signal used for the tension control of a material to be rolled is switched and stably performing the tension control of the material to be rolled.;SOLUTION: A pressure command correction amount learning unit 3 learns a coefficient of a relevant equation representing correlation between a pressure detection value obtained by a pressure detection unit 27 and a first pressure command value correction amount based on a load detection value calculated by a first pressure command correction unit 24 when there is no abnormality in a load detection value obtained by a load detection unit 28. A device of controlling tension of a material to be rolled 1 switches a pressure command value correction amount used by a pressure command calculation unit 20 from the first pressure command value correction amount calculated by the first pressure command correction unit 24 to a second pressure command value correction amount calculated by a second pressure command correction unit 25 based on correlation studied by the pressure command correction amount learning unit 3 when a normal load detection value cannot be obtained by the load detection unit 28. Since these correction amounts are correlated, the correction amount is not largely changed during switching. Accordingly, the tension control of the material to be rolled does not become unstable.;COPYRIGHT: (C)2012,JPO&INPIT