DIMENSION CONTROL METHOD FOR HOT ROLLED STEEL STOCK

摘要

PURPOSE:To obtain the highly accurate feedback dimensional control by calculating and using a sectional average temp. of a hot rolled steel stock at the time changing hot rolling dimensions. CONSTITUTION:Hot rolling dimensions of a hot rolled stock 1 is measured by a dimension detector 7 and the measured dimension is outputted from the detector 7 to a dimension controller 11. A target dimension arithmetic unit 9 calculates the hot rolling target dimension based on inputs of the data of a sectional average temp. of the stock 1 from a temp. arithmetic unit 8 and of the cold rolling target dimension from a dimension setter 10. The obtained hot rolling target dimension is outputted to the dimension controller 11, which calculates a deviation between the hot rolling target dimension and a dimension of the stock 1 and outputs a dimension correction value proportioned to the deviation to a rolling mill.