ECCENTRIC ROLL DETECTION OF ROLLING MILL

PURPOSE:To accurately effect separated detection of an eccentric waveform of top and bottom back-up roll, by detecting separately each eccentricity of top and bottom back-up roll (BUR) and detecting separately eccentricity in an approximated manner on each revolution of top or bottom back-up roll by the specified value. CONSTITUTION:Top BUR 4 and bottom BUR 7 of a rolling mill 1 are provided with revolution angle meter 5 for the top BUR and that 8 for the bottom BUR respectively and further, rolling dynamometer 2 and screw-down mechanism 3 are installed. A roll eccentricity control apparatus 26 operates the mechanism 3 for controlling the roll eccentricity based upon an outputs of revolution angle meters 5 and 8. Amplitude and phase of each eccentricity of top and bottom BUR required for the roll eccentricity control are recorded in an amplitude and phase memory and arithmetic operating apparatus 25 and the amplitude and phase data of each eccentricity of top and bottom BUR are updated for each start timing of each apparatus by the outputs of eccentricity separating and detecting apparatus 22 of top and bottom BUR and the outputs of eccentricity approximate separating and detecting apparatus 24 or top and bottom BUR.