Abstract
Recently, for thickness gauge of cold strip, higher accuracy is required by customers than ever. To supply high quality strip, we have developed a New AGC system, and have applied it to No.1 Cold Tandem Mill at Kawasaki steel's Mizushima Works in 1990.To decide revamping items, each item is evaluated using dynamic simulater. This revamping is composed of three functions as below. : (1)All stands back up roll roller type bearings as a substitute for oil film type bearings (mogoil bearings) (2)The new AGC controller (high-response AGC and non-interference fuzzy control) (3)The new sensors (strip speed meter of Laser Doppler Type)By this improvement, the thickness accuracy of strip is remarkably improved. The thickness accuracy is within 0.3% in the steady rolling and within 1.6% of finished thickness for a 0.8mm strip thickness in the unsteady rolling.
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