Method for producing metal strips

Patent metadata

Field	Value
Publication number	US-10625317-B2
Application number	US-201615558020-A
Country	US
Kind code	B2
Filing date	Mar 15, 2016
Priority date	Mar 16, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A method for producing metal strip in a rolling mill, so that as a result of a more accurate manufacturing of metal strips in the future, a more precise forecasting of the profile contour of the metal strip can be obtained over the width of the metal strip, as well as a more precise setting of the profile actuator of the rolling mill. A forecast value is calculated for the profile contour within the context of the simulation of the rolling process before the rolling of the metal strip. In contrast to that, the calculation in the simulation is not conducted prior to the rolling, but instead it is obtained by a post-calculation after the rolling of the metal strip has been carried out.

First claim

The invention claimed is:

1. A method for producing metal strips in a rolling mill with a desired profile contour, comprising the following steps:
a) presetting a target value for the profile contour for at least one reference position bi in the width direction for at least one n′th metal strip;
b) simulating a rolling process on a rolling line for producing the metal strips with the-aid of a process model, wherein setting values for profile actuators and a forecast value C P (n)bi for the profile contour of the n′th metal strip are calculated at the reference position bi that is as close as possible the target value, the calculated setting values taking into consideration old adaptation values ΔC(n−x)bi based on a difference between an old measured actual value C actual (n−x)bi for the profile contour and an old forecast value C P (n−x) calculated for the profile contour of the n′th metal strip at the reference position bi and with potential restrictions with respect to the profile actuators;
c) setting the profile actuators with the calculated setting values;
d) rolling the n′th metal strip;
e) measuring an actual value C actual (n)bi of the profile contour of the rolled n′th metal strip at the reference position bi; and
f) determining a new adaptation value ΔC(n) bi based on the difference between the actual value C actual (n)bi measured in step e) and the forecast value C P (n)bi calculated in step b) for the profile contour of the n′th metal strip at the reference position bi;
wherein the steps a), b) and c) are carried out before the rolling of the at least n′th metal strip for a plurality |, wherein |≥2, of reference positions bi, wherein 1≤i≤|, in at least one width section of the at least n′th metal strip;
wherein the steps e) and f) are carried out after the rolling of the at least n′th metal strip for the plurality | of reference positions bi in order to determine the new adaptation value ΔC(n) bi at the plurality | of the reference positions bi in the at least one width section of the at least n′th metal strip; and
g) wherein during a subsequent production of a further longitudinal section of the n′th metal strip or of an n+x′th metal strip, wherein x=1, 2, etc., at least the steps a) through d) are repeated with n=n+x, wherein the new adaptation values ΔC(n) bi determined previously according to step f) at least for the n′th metal strip are taken into account for the plurality | of the reference positions bi during the calculation of the settings for the profile actuator and for the calculation of the forecast values according to step b) for the n+x′th metal strip as old adaptation values.

2. The method according to claim 1 , wherein the determination of the new adaptation value ΔC(n)bi according to step f) at the reference positions bi of the n′th metal strip is carried out at least partially as a short-term adaptation value ΔC K (n)bi calculated according to the following formula:
Δ C ( n ) bi=ΔC K ( n ) bi=ΔC K ( n−x ) bi +[ C actual ( n ) bi−C P ( n ) bi ],

wherein:
K: short-term adaptation,
x=1, 2, 3 . . . ;
ΔC K (n−x)bi: old short-term adaptation value;
C actual (n)bi: measured actual value for the profile contour of the n′th metal strip at the reference position bi; and
C P (n)bi: calculated forecast value or calculated strip profile.

3. A method for producing metal strips in a rolling mill with a desired profile contour, provided with the following steps:
a) presetting a target value for the profile contour for at least one reference position bi in the width direction for at least one n′th metal strip;
b) simulating a rolling process on the rolling line for producing the metal strips with the aid of a process model, wherein the setting values for profile actuators are calculated in such a way to obtain a target value is close as possible to the desired profile contour while taking into account all adaptation values at reference positions bi and possible restrictions with respect to the profile actuators;
d) adjusting the profile actuators with the calculated adjustment values;
d) rolling the n′th metal strip;
e) measuring the actual value C actual (n)bi of the profile contour of the rolled n′th metal strip at the reference position bi;
e′) calculating a recalculated forecast value C′ P (n)bi for the profile contour of the n′th metal strip at the reference position bi on the basis of the rolling mill conditions and current processing positions, as present during the rolling of the n′th metal strip according to step d); and
f) determining a new adaptation value ΔC(n) bi based on the difference between the actual value C actual (n)bi and the forecast value C P (n)bi recalculated for the profile contour of the n′th metal strip at the reference position bi;
wherein the steps a), b) and c) are carried out before the rolling of the at least n′th metal strip for a plurality |, wherein |≥2, of reference positions bi, wherein 1≤|, in at least one width section of the at least n′th metal strip; wherein the steps e), e′) and f) are carried out after the rolling of the at least n′th metal strip for the plurality of reference positions bi in order to determine the new adaptation value ΔC(n) bi at the plurality of the reference positions bi in the at least one width section of the at least n′th metal strip; and
g) wherein during a subsequent production of a further longitudinal section of the n′th metal strip or of an n+x′th metal strip, wherein x=1, 2, etc., at least the steps a) through d) are repeated with n=n+x, wherein the new adaptation values ΔC(n) bi determined previously according to step f) at least for the n′th metal strip are taken into account for the plurality | of the reference positions bi during the calculation of the settings for the profile actuator and for the calculation of the forecast values according to step b) for the n+x′th metal strip as old adaptation values.

4. The method according to claim 3 , wherein the determination of the new adaptation value ΔC(n)bi according to step f) at the reference positions bi of the n′th metal strip is carried out at least partially as a short-term adaptation value ΔC K (n)bi calculated according to the following formula:
Δ C ( n ) bi=ΔC K ( n ) bi=ΔC K ( n−x ) bi +[ C actual ( n ) bi−C′ P ( n ) bi ],

wherein:
K: short-term adaptation,
x=1, 2, 3 . . . ;
ΔC K (n−x)bi: old short-term adaptation value;
C actual (n)bi: measured actual value for the profile contour of the n′th metal strip at the reference position bi; and
value C′ P (n)bi: measured recalculated forecast value or strip profile to be recalculated.

5. The method according to claim 3 , wherein the determination of new adaptation value ΔC(n)bi according to claim f) at the reference positions bi is carried at least partially as long-term adaptation values ΔC L (n)bi by carrying out the following steps:
determining the adaptation values by repeating the steps a) through f) at a plurality | of reference positions bi for a plurality of metal strips of an adaptation group processed by rolling before the n+x′th metal strip; and
calculating the long-term position values ΔC L (n)bi based on average values of the adaptation values, or based on average values of differences between the actual values and forecast values for the profile contour for the plurality of metal strips, in each case at a reference position bi.

6. The method according to claim 2 , wherein determination of the adaptation value ΔC(n)bi according to step f) as a sum adaptation value ΔC S (n)bi based on a sum of the calculated short-term adaptation value ΔC K (n)bi and long term adaptation value ΔC L (n)bi to be used for the metal strip n+x, the long term adaptation value ΔC L (n)bi being calculated as average values of the adaptation values or average value

Assignees

• Sms Group Gmbh

Inventors

• Seidel Jürgen
• Baumgärtel Uwe
• Wachsmann Ralf

Classifications

• B21B2263/02

  Profile, e.g. of plate, hot strip, sections · CPC title

• B21B37/28 Primary

  Control of flatness or profile during rolling of strip, sheets or plates · CPC title