JPS5471751A - Controller for hot rolling mill - Google Patents

Abstract

PURPOSE: To accurately compensated the difference in the elongation, etc., of the rolled material, by continuously measuring the variable element of the rolled material at two points on the line, and by adjusting the magnifying power of coordinate axis and phase of either one of measured signal so as to make maximum the correlation function for two signals.

CONSTITUTION: The broadside rolling load signal from the load cell 11 and the length timing signal from the tachometer 12, are inputted to the reader/controller 6 whose output for the pattern of load fluctuation is memorized in the signal memory 7. The signal from the thermometer 5 and the length timing signal from the tachometer 13, are inputted to the reader/controller 8, whose output for the pattern of temperature fluctuation is memorized in the signal memory 9. The temperature signal is successively taken out of the memory 9; the load signal is taken out of the memory 7, correlating with combination between the upper and lower limit 17a, 17b, of forecast elongation in the next rolling pass and the upper and lower limit 18a, 18b, of the phase difference; the combination for making maximum the correlation function is operated by the operator 10. This signal is successively inputted to the sheet thickness controller 14, and the opening of the edger roll is feed- forward controlled correspondingly to the deviation of the measured load value 20 of memory 7 from the reference value.

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