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US 4,587,819 AGranted
Method and circuit for flatness control in rolling mills
AssigneeBrown, Boveri & Cie AG
InventorMarek Hausen
Life of this patent
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AssigneeBrown, Boveri & Cie AG
InventorMarek Hausen
Estimating the term…
A method for controlling flatness in cold-rolling mills having a roll stand with at least six rolls including intermediate and working rolls capable of being deflected, includes measuring tensile stress distribution over the width of a strip to be rolled having central and edge regions, comparing the measured tensile stress distribution with a desired predeterminable tensile stress distribution, determining a deviation at the central region of the strip between the measured and desired tensile stress distribution, determining a deviation at the edge region of the strip between the measured and desired tensile stress distribution, forming a strip center coefficient from the central region deviation in the form of a deviation control for influencing deflection of the intermediate roll, and forming a strip edge coefficient from the edge region deviation in the form of a deviation control for influencing deflection of the working roll, and a circuit for carrying out the method.
Method for controlling flatness in cold-rolling mills having a roll stand with a least six rolls including intermediate and working rolls capable of being deflected, which comprises measuring tensile stress distribution over the width of a strip to be rolled having central and edge regions, comparing the measured tensile stress distribution with a desired predeterminable tensile stress distribution, determining a deviation at the central region of the strip between the measured and desired tensile stress distribution, determining a deviation at the edge region of the strip between the measured and desired tensile stress distribution, forming a strip center coefficient from the central region deviation in the form of a deviation control for influencing deflection of the intermediate roll, and forming a strip edge coefficient from the edge region deviation in the form of a deviation control for influencing deflection of the working roll.
Circuit for controlling flatness in cold-rolling mills having a roll stand with at least six rolls including intermediate and working rolls capable of being deflected, comprising means for measuring tensile stress distribution over the width of a strip to be rolled having central and edge regions, means connected to said measuring means for comparing the measured tensile stress distribution with a desired predetermined tensile stress distribution forming a tensile stress distribution difference signal, a measured-value processing device having a measured-value input connected to said comparing means for forming a strip center coefficient and a strip edge coefficient from said tensile stress distribution difference signal, first and second control lines connected to said measured-value processing device, at least one first control element connected to said first control line for controlling deflection of the intermediate roll, and at least one second control element connected to said second control line for controlling deflection of the working roll.
Dependencies are inferred from the claim text.