Flatness control apparatus for a hot rolling mill
AssigneeKabushiki Kaisha Toshiba
InventorTomoyuki Tezuka
Life of this patent
Estimating the term…
Abstract
A flatness control apparatus for controlling the flatness of a strip in a hot rolling mill, wherein a strip width meter measures center line error values of the strip. The center line error values are the offsets of the center of the strip from the center of the hot rolling mill line and are positive if the center of the strip is offset toward a drive side of the mill. A flatness meter, installed on the delivery side of the mill, measures flatness of the strip at positions specified by the flatness control apparatus. Based on the center line error values and the flatness measurements, the flatness control apparatus calculates adjustments to be made to a work roll bending apparatus on a final stand in the mill in order to control strip flatness.
Claims16
A flatness control apparatus for a hot rolling mill, comprising:
- a strip width meter, installed on an entry side of the hot rolling mill, configured to measure center line error values of a strip;
- a flatness meter, installed on a delivery side of the hot rolling mill configured to measure flatness of the strip;
- an actuator configured to control the flatness of the strip;
- means for determining positions on the strip at which to measure the flatness with the flatness meter based on the center line error values and pre-set strip width values;
- means for determining deviations between measured flatness values and pre-set flatness reference values;
- means for determining correction actuator values based on the deviations;
- and
- means for determining manipulated actuator values based on the correction actuator values.
A flatness control apparatus for a hot rolling mill, comprising:
- a strip width meter, installed on a delivery side of the hot rolling mill, configured to measure center line error values of a strip;
- a flatness meter, installed on the delivery side of the hot rolling mill, configured to measure flatness of the strip;
- an actuator configured to control the flatness of the strip;
- means for presuming center line error values of a next strip based on center line error values of a previous strip, the next strip rolled after the previous strip;
- means for determining positions on the next strip at which to measure the flatness with the flatness meter based on the center line error values of the next strip and pre-set strip width values;
- means for determining deviations between measured flatness values and pre-set flatness reference values;
- means for determining correction actuator values based on the deviations;
- and
- means for determining manipulated actuator values based on the correction actuator values.
A flatness control apparatus for a hot rolling mill, comprising:
- a first strip width meter, installed on an entry side of the hot rolling mill, configured to measure first center line error values of a strip;
- a second strip width meter, installed on a delivery side of the hot rolling mill, configured to measure second center line error values of a strip;
- a flatness meter, installed on the delivery side of the hot rolling mill, configured to measure flatness of the strip;
- an actuator configured to control the flatness of the strip;
- means for presuming center line error values of a next strip based on first center line error values of the next strip and first center line error values of a previous strip, and second center line error values of the previous strip, the next strip rolled after the previous strip;
- means for determining positions on the next strip at which to measure the flatness with the flatness meter based on the center line error values of the next strip presumed by the means for presuming and pre-set strip width values;
- means for determining deviations between measured flatness values and pre-set flatness reference values;
- means for determining correction actuator values based on the deviations;
- and
- means for determining manipulated actuator values based on the correction actuator values.
A flatness control apparatus for a hot rolling mill, comprising:
- a strip width meter, installed on a delivery side of the hot rolling mill, configured to measure center line error values of a strip;
- a flatness meter, installed on the delivery side of the hot rolling mill, configured to measure flatness of the strip;
- an actuator configured to control a flatness of the strip:
- means for correcting measured flatness values of the flatness meter based on the center line error values;
- means for determining deviations between the measured flatness values corrected by the means for correcting and pre-set flatness reference values;
- means for determining correction actuator values based on the deviations;
- and
- means for determining manipulated actuator values based on the correction actuator values.
Dependencies are inferred from the claim text.