(19)
(11) EP 0 151 675 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.11.1987 Bulletin 1987/45

(43) Date of publication A2:
21.08.1985 Bulletin 1985/34

(21) Application number: 84107573

(22) Date of filing: 29.04.1981
(84) Designated Contracting States:
DE FR GB

(71) Applicant: KAWASAKI STEEL CORPORATION
 ()

(72) Inventors:
  • Aizawa, Hitoshi
     ()
  • Takarada, Masaaki
     ()

   


(54) Method of automatically controlling the rate of reduction in a rolling mill


(57) The invention describes a method for automatically controlling the rate of reduction suitable for ARC mode of the method for automatically controlling the strip thickness, the rate of reduction is controlled such that an output thickness of the material is calculated from an actually measured input thickness of the material and the desired rate of reduction based on the principle of the constant mass-flow rate of the material being rolled an input thickness is estimated from the calculated output thickness, an input length and an output length and an error signal between the estimated input thickness and the actually measured input thickness is diminished to zero.






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