Board thickness presumption manner and the device and the board thickness control unit null in board thickness controlling

摘要

PURPOSE:To control a plate thickness with high accuracy in consideration of an expansion of a gage-meter type roll in a plate thickness control. CONSTITUTION:A rolling load P, a draft position S, a bender load Pb are detected, further, the plate thickness (h) and a temperature a rolled stock 1 are measured on the outlet side of a mill 20. The expansion DELTAu of the roll is calculated by a roll expansion estimating part 11 through a measured temperature 20, each detected measured data are sent to a parameter estimating part 13 through a data tracking part 12 and each parameter (mill constant, bender mill constant, rolling offset, roll expansion) in an estimating expression of the plate thickness directly below the rolled roll is identified by a statical technique. The plate thickness (h) is recalculated by these identified parameters in an arithmetic part for the plate thickness and this estimated value (h) for the plate thickness is fed back to control the plate thickness.