Patent ID: 6708077
Filing Date: 2004-03-16
Classification: B21B,C21D

Abstract:
A method for pacing an extraction of billets from a furnace intended for a stand having at least one strand, the method comprising the steps of:extracting a first billet from the furnace at a first time, the first billet being intended for a first strand of the stand; predicting a rolling time of the first billet through the first strand based at least in part on at least one measured property of the first billet; determining a first correction value based on an equation: Corn=Cornâˆ’1+(Measured_TimeStrand1âˆ’Rolling_TimeStrand1âˆ’Cornâˆ’1)*k where Corn represents the first correction value, Cornâˆ’1 represents a previous correction value used to adjust a timing of an extraction of a previously extracted billet from the furnace intended for the first strand, Measured_TimeStrand1 represents a measured rolling time of the previously extracted billet at the first strand, Rolling_TimeStrand1 represents a predicted rolling time of the previously extracted billet at the first strand, and k represents a real-number adjustment factor;determining a first furnace time based at least in part on the predicted rolling time of the first billet, a desired gap between billets at the first strand, and the correction value; and extracting a second billet from the furnace at a second time subsequent to the first time, the second billet being intended for the first strand, and wherein a difference between the first time and the second time is substantially equivalent to the first furnace time.