Appeal No. 95-2637
Application 08/128,051
APPENDIX
4. In a steel mill comprising a reheat furnace for
heating the steel pieces and a rolling mill for reducing the
steel pieces, a method of controlling the rolling temperature of
the steel pieces at a position in the rolling mill by
continuously, dynamically modifying conditions in the reheat
furnace comprising the steps of:
selecting from a mill practice table relating an
initial aim discharge temperature of the steel pieces from the
reheat furnace and an aim temperature of the steel pieces in the
rolling mill for specific grades, product shapes and sizes;
using a reheat furnace model for calculating a
calculated discharge temperature from the reheat furnace of a
steel piece based upon grade, size, tracking information and
measured temperatures in the reheat furnace, wherein said
calculation of a reheat furnace discharge temperature is repeated
for each steel piece leaving the reheat furnace;
modifying furnace conditions to drive said
calculated discharge temperature to said aim discharge
temperature;
measuring a temperature of the steel piece in the
rolling mill, wherein said measuring of the steel piece
temperature is repeated for each steel piece passing through the
rolling mill;
determining a ratio between said calculated
discharge temperature from the reheat furnace and said measured
rolling mill temperatures for steel pieces in the mill;
statistically filtering said ratios to remove
extreme values of said ratios based upon time in the rolling mill
to provide filtered ratios;
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Last modified: November 3, 2007