JPS5779011A - Controlling method for sheet breadth in hot strip mill - Google Patents

Abstract

PURPOSE: To exactly control the sheet breadth, by adding a prescribed correction to the sheet breadth detected by a breadth meter on the feed-in side of the mill for various points along the longitude, by extracting the minimum sheet breadth from these data, by computing the deviation of this minimum breadth from an aimed breadth size, and by controlling the tension in order to eliminate this deviation.

CONSTITUTION: A material information signal is inputted by a process computer to a function generator 42; the output of the function generator 42 is inputted to a breadth changing rate computer 44, which then adds an output signal of loopers 31W35 to its input, and computes the breadth changing rate due to the change of the tension; then, the computer 44 inputs thus computed breadth changing rate to a tracking device 50. Meanwhile, a rolling schedule signal is inputted to the tracking device 50 through a spread rate computer 46 and a forward slip computer 48. A corrected sheet breadth obtained by adding a signal of a breadth meter 40 to the input of the said tracking device 50 is inputted to a controlled sheet breadth extractor 52 which then extracts a minimum strip breadth and inputs it to a controlled tension computer 58. This computer 58 receives an output of an aimed breadth setter 54 and outputs an aimed tension value for eliminating the breadth deviation; hereby, the breadth control is proceeded.

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