JPS5577922A - Feedforward controlling method for thickness of rolled material - Google Patents

Abstract

PURPOSE:To make possible the thickness deviation on the exit side of the rolling mill to be surely excluded, by detecting thickness deviation on the entry side of the mill, by operating the actual plasticity constant from actual rolling conditions including actual rolling load, and by correcting the controlled amount of the reducing rolls' gap depending on the result of above operations. CONSTITUTION:The rolling plant is constituted of the rolling mill 12, reducing rolls 14, the rolling load detector 15, the thickness detector 16, etc. The draft correction arithmetic unit 20 operates the draft correction depending on the entry side thickness of the rolled material 10 being detected by the thickness detector 16. On the other hand, the actual plasticity constant is operated by the plasticity constant arithmetic unit 34 depending on the actual rolling conditions including actually measured rolling load detected by the rolling load detector 15. This plasticity constant together with the previously calculated plasticity constant of the rolled material 10 are inputted to the adaptable correction factor arithmetic unit 36, which then operates the adaptable correction factor that is multiplied by the draft position correction; the result of this multiplication is inputted to the draft position controller 22 which then controls the reducing rolls' gap.