EP0962266B1 - Method of regulating the exit thickness of a rolled strip - Google Patents

Method of regulating the exit thickness of a rolled strip Download PDF

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Publication number
EP0962266B1
EP0962266B1 EP99110932A EP99110932A EP0962266B1 EP 0962266 B1 EP0962266 B1 EP 0962266B1 EP 99110932 A EP99110932 A EP 99110932A EP 99110932 A EP99110932 A EP 99110932A EP 0962266 B1 EP0962266 B1 EP 0962266B1
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EP
European Patent Office
Prior art keywords
thickness
roll stand
strip
speed
manipulated variable
Prior art date
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Revoked
Application number
EP99110932A
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German (de)
French (fr)
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EP0962266A2 (en
EP0962266A3 (en
Inventor
Andreas Dr.-Ing. Hambrecht
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Alstom Power Conversion GmbH
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Alstom Power Conversion GmbH
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Application filed by Alstom Power Conversion GmbH filed Critical Alstom Power Conversion GmbH
Publication of EP0962266A2 publication Critical patent/EP0962266A2/en
Publication of EP0962266A3 publication Critical patent/EP0962266A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions

Definitions

  • the invention relates to a method for regulating the outlet thickness of a rolled strip according to the preamble of claim 1.
  • a so-called thickness feedforward control which corrects the position of the roll stand, ie the size of the roll gap, in accordance with the thickness deviation ⁇ h e of the incoming strip.
  • the disadvantage is that - as for any device that only makes a correction based on an inlet measured value without feedback of the change achieved - the outlet thickness h a can only be controlled, but not regulated, by means of pilot control.
  • any remaining thickness errors downstream of the roll stand are recorded with a thickness measuring device and corrected by changing the position of the roll stand or, in the case of small strip thicknesses, by changing the strip retraction.
  • the pitch ie the roll gap of the roll stand
  • a change in rolling force thus acts as a manipulated variable. Since the control loop only receives the measured value for the setpoint deviation ⁇ h a with a time delay due to the strip running time corresponding to the distance between the roll gap and the thickness gauge, the control loop gain cannot be set too large in order to avoid oscillation of the control loop.
  • a disadvantage when using the rolling force as a manipulated variable for control the outlet thickness is limited to a relatively small one Range. Too great a rolling force would make the strip shape unfavorable influence. In addition, one hardly becomes by adjusting the rolling force dominant influence on various other rolling parameters, which in turn has an impact on the tape quality and partly on the Have the outlet thickness of the rolled strip.
  • the object of the invention is to provide a method of the type mentioned at the outset which avoids the above-mentioned disadvantages of the known methods.
  • the object is achieved by the characterizing features of claim 1.
  • the coefficient of friction ⁇ is dependent, for example, on the temperature in the roll gap, on a lubrication, in particular its film thickness, and also on the leading speed of the roll stand.
  • a preferred embodiment is according to claim 3 by Speed setting for influencing the master speed or given a change in guidance speed.
  • the speed is in terms of measurement technology, for example using a Hall sensor, very precisely verifiable.
  • Claim 4 characterizes a simple possibility of a multi-skeleton Control the rolling mill with regard to the strip thickness.
  • the figure shows, in a highly simplified, schematic representation, the main components of a rolling mill in conjunction with a regulation of the outlet thickness h a of a strip to be rolled — not shown.
  • a roll stand 1 is equipped with rolls 2 and a drive 3.
  • the strip is rolled in a roll gap 4 by means of plastic forming to a target run-out thickness h a .
  • Downstream of this last roll stand 1 of a further n stands 5.1, 5.2, 5.3 ... 5.
  • the rolling train has a continuous or intermittent thickness measurement 6 of the outgoing strip.
  • the measured value h a is fed to a control device 7 which acts on a master setpoint 8.
  • This master setpoint is fed to all roll stands 1, 5.1, 5.2, 5.3 ... 5. n and, if necessary, also to the reels.
  • This master setpoint acts on the respective drives - exemplified for the roll stand 1 as drive 3 - in the sense of a speed adjustment of the rolls 2.
  • the resulting setting of the master speed v of the roll stand 1, 5.1, 5.2, 5.3 ... 5.
  • ⁇ f ( v ) the coefficient of friction ⁇ .
  • This coefficient of friction ⁇ in turn influences the outlet thickness h a , which closes the control loop.
  • the invention is not limited to the above Embodiment. Rather, a number of variants are conceivable which even if the execution is fundamentally different Make use of features of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The method for regulating the exit thickness of a rolled strip after at least one roll stand, with the deviation from the strip target thickness used as a controller of an adjustment variable, is characterized by the fact that the coefficient of friction between the roll stand and the strip is used as an adjustment variable.

Description

Die Erfindung betrifft ein Verfahren zur Regelung der Auslaufdicke eines gewalzten Bandes gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for regulating the outlet thickness of a rolled strip according to the preamble of claim 1.

Bei der Herstellung gewalzter Bänder werden häufig höchste Ansprüche an die Dickentoleranz (bis in den µm-Bereich) gestellt. Außerdem besteht das Erfordernis, die verwertbare Länge des Bandes zu steigern, d.h., den Dickenfehler möglichst auch in der Beschleunigungs- bzw. Abbremsphase der Walzstraße auszuregeln. Bei Beschleunigung und Verzögerung treten jedoch Störgrößen auf, die durch eine geschwindigkeitsabhängige Änderung der Verformungseigenschaften im Walzspalt erzeugt werden.The highest demands are often placed on the production of rolled strips the thickness tolerance (down to the µm range). In addition, there is Requirement to increase the usable length of the tape, i.e. the Thickness errors as far as possible also in the acceleration or deceleration phase of the rolling mill. Accelerate and decelerate however, disturbance variables caused by a speed-dependent Change in the deformation properties are generated in the roll gap.

Es ist bekannt, eine Dickenregelung nach dem Prinzip des konstanten Massenflusses zu realisieren. Da der Volumendurchsatz stromauf und stromab des Walzgerüstes konstant ist und während des Walzprozesses keine nennenswerte Veränderung der Breite des Bandes eintritt, gilt: hu = he ve / va mit ve als Einlaufgeschwindigkeit, va als Auslaufgeschwindigkeit, he als Einlaufdicke und ha als Auslaufdicke. Um die Auslaufdicke h a möglichst konstant zu halten, muß also der Einfluß einer schwankenden Einlaufdicke he kompensiert und das Geschwindigkeitsverhältnis ve /va konstant gehalten werden. Dazu wird eine sogenannte Dickenvorsteuerung eingesetzt, die entsprechend der Dickenabweichung Δhe des einlaufenden Bandes die Anstellposition des Walzgerüstes, d.h. die Größe des Walzspaltes, korrigiert. Nachteilig ist, daß - wie für jede Einrichtung, die nur aufgrund eines Einlaufmeßwertes ohne Rückmeldung der erreichten Änderung eine Korrektur durchführt - mittels Vorsteuerung die Auslaufdicke ha nur steuerbar, nicht aber regelbar ist. Die zweite Forderung (ve /va = const) wird durch Drehzahlregelungen und konstante Haspelzüge, d.h. konstante Bandvor- und -Rückzüge, erreicht. Verbleibende Dickenfehler stromab des Walzgerüstes werden mit einem Dickenmeßgerät erfaßt und durch entsprechende Änderung der Anstellposition des Walzgerüstes bzw. bei kleinen Banddicken durch Änderung des Bandrückzuges korrigiert. In Abhängigkeit von der Beschleunigung oder der Verzögerung der Bandgeschwindigkeit wird die Anstellung, d.h. der Walzspalt des Walzgerüstes auf- bzw. zugefahren. Als Stellgröße fungiert hier folglich eine Walzkraftänderung. Da der Regelkreis den Meßwert für die Sollwertabweichung Δha wegen der Bandlaufzeit entsprechend dem Abstand zwischen Walzspalt und Dickenmeßgerät nur zeitverzögert erhält, kann die Regelkreisverstärkung nicht all zu groß eingestellt werden, um ein Schwingen des Regelkreises zu vermeiden.It is known to implement a thickness control based on the principle of constant mass flow. Since the volume throughput upstream and downstream of the rolling stand is constant and there is no significant change in the width of the strip during the rolling process, the following applies: h u = h e v e / v a with v e as the infeed speed, v a as the outfeed speed, h e as the infeed thickness and h a as the outlet thickness. In order to keep the outlet thickness h a as constant as possible, the influence of a fluctuating inlet thickness h e must therefore be compensated for and the speed ratio v e / v a kept constant. For this purpose, a so-called thickness feedforward control is used, which corrects the position of the roll stand, ie the size of the roll gap, in accordance with the thickness deviation Δh e of the incoming strip. The disadvantage is that - as for any device that only makes a correction based on an inlet measured value without feedback of the change achieved - the outlet thickness h a can only be controlled, but not regulated, by means of pilot control. The second requirement ( v e / v a = const ) is achieved by speed controls and constant reel pulls, ie constant strip advance and retraction. Any remaining thickness errors downstream of the roll stand are recorded with a thickness measuring device and corrected by changing the position of the roll stand or, in the case of small strip thicknesses, by changing the strip retraction. Depending on the acceleration or deceleration of the belt speed, the pitch, ie the roll gap of the roll stand, is opened or closed. A change in rolling force thus acts as a manipulated variable. Since the control loop only receives the measured value for the setpoint deviation Δ h a with a time delay due to the strip running time corresponding to the distance between the roll gap and the thickness gauge, the control loop gain cannot be set too large in order to avoid oscillation of the control loop.

Nachteilig bei der Verwendung der Walzkraft als Stellgröße zur Regelung der Auslaufdicke ist die Beschränkung auf einen relativ geringen Stellbereich. Eine all zu große Walzkraft würde die Bandform ungünstig beeinflussen. Außerdem wird durch Walzkraftverstellung eine kaum zu beherrschende Einflußnahme auf diverse weitere Walzparameter ausgeübt, welche wiederum Auswirkungen auf die Bandqualität und teilweise auf die Auslaufdicke des gewalzten Bandes haben.A disadvantage when using the rolling force as a manipulated variable for control the outlet thickness is limited to a relatively small one Range. Too great a rolling force would make the strip shape unfavorable influence. In addition, one hardly becomes by adjusting the rolling force dominant influence on various other rolling parameters, which in turn has an impact on the tape quality and partly on the Have the outlet thickness of the rolled strip.

Aufgabe der Erfindung ist es, ein Verfahren der eingangs genannten Art anzugeben, das oben genannte Nachteile der bekannten Verfahren vermeidet.
Erfindungsgemäß wird die Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Durch Einflußnahme auf den Reibungskoeffizienten µ zwischen Walzgerüst und gewalztem Band als Stellgröße ergibt sich eine größere Genauigkeit und Reproduzierbarkeit der Regelung, wodurch letztlich die Auslaufdicke ha des gewalzten Bandes auch in der Anlauf- bzw. Bremsphase der Walzstraße konstant gehalten werden kann. The object of the invention is to provide a method of the type mentioned at the outset which avoids the above-mentioned disadvantages of the known methods.
According to the invention the object is achieved by the characterizing features of claim 1. By influencing the coefficient of friction µ between the roll stand and the rolled strip as a manipulated variable, the control is more accurate and reproducible, which ultimately allows the runout thickness h a of the rolled strip to be kept constant even during the start-up or braking phase of the rolling train.

Ausschußlängen am Anfang und am Ende des Bandes, welche eingeschmolzen und neu gewalzt werden müssen, werden auf ein Minimum reduziert.Reject lengths at the beginning and end of the tape, which must be melted down and re-rolled to a minimum reduced.

Da die plastischen Umformeigenschaften ganz erheblich von dem Reibungskoeffizienten µ abhängen, ergibt sich ein großer Stellbereich, wobei für die Verstellung des Reibungskoeffizienten µ mehrere Möglichkeiten zur Verfügung stehen. Der Reibungskoeffizient µ ist beispielsweise von der Temperatur im Walzspalt, von einer Schmierung, insbesondere deren Filmdicke, und auch von der Leitgeschwindigkeit des Walzgerüstes abhängig.Since the plastic forming properties depend considerably on the coefficient of friction µ , there is a large adjustment range, with several options being available for adjusting the coefficient of friction µ . The coefficient of friction μ is dependent, for example, on the temperature in the roll gap, on a lubrication, in particular its film thickness, and also on the leading speed of the roll stand.

Gemäß Anspruch 2 ist vorgesehen, als Stellgröße zur Änderung des Reibungskoeffizienten die Leitgeschwindigkeit ν des Walzgerüstes mit µ = f(v) zu verwenden. Diese Geschwindigkeit ist vorteilhafterweise sehr feinfühlig einstellbar.According to claim 2 it is provided to use the master speed ν of the roll stand with µ = f ( v ) as the manipulated variable for changing the coefficient of friction. This speed can advantageously be set very sensitively.

Eine zu bevorzugende Ausführungsform ist gemäß Anspruch 3 durch die Drehzahleinstellung für die Einflußnahme auf die Leitgeschwindigkeit bzw. eine Leitgeschwindigkeitsänderung gegeben. Die Drehzahl ist meßtechnisch, beispielsweise mittels eines Hall-Sensors, sehr exakt überprüfbar.A preferred embodiment is according to claim 3 by Speed setting for influencing the master speed or given a change in guidance speed. The speed is in terms of measurement technology, for example using a Hall sensor, very precisely verifiable.

Anspruch 4 charakterisiert eine einfache Möglichkeit, eine mehrgerüstige Walzstraße hinsichtlich der Banddicke zu regeln.Claim 4 characterizes a simple possibility of a multi-skeleton Control the rolling mill with regard to the strip thickness.

Nachfolgend wird die Erfindung anhand eines figürlich dargestellten Ausführungsbeispiels näher erläutert.
Die Figur zeigt in stark vereinfachter schematisierter Darstellungsweise die Hauptbestandteile einer Walzstraße in Verbindung mit einer Regelung der Auslaufdicke ha eines zu walzenden -nicht dargestellen- Bandes. Ein Walzgerüst 1 ist mit Walzen 2 und einem Antrieb 3 ausgestattet. Das Band wird in einem Walzspalt 4 mittels plastischer Umformung auf eine Soll-Auslaufdicke ha gewalzt. Stromab dieses letzten Walzgerüstes 1 einer noch n weitere Gerüste 5.1, 5.2, 5.3 ... 5. n aufweisenden Walzstraße erfolgt eine kontinuierliche oder taktweise Dickenmessung 6 des auslaufenden Bandes. Der Meßwert ha wird einer Regeleinrichtung 7 zugeführt, welche einen Leitsollwertgeber 8 beaufschlagt. Letzterer generiert eine Stellgröße, die ein Maß für eine Walzgeschwindigkeit ν darstellt. Dieser Leitsollwert wird allen Walzgerüsten 1, 5.1, 5.2, 5.3 ... 5.n sowie gegebenenfalls auch den Haspeln zugeführt. Dieser Leitsollwert wirkt auf die jeweiligen Antriebe - beispielhaft für das Walzgerüst 1 als Antrieb 3 dargestellt - im Sinne einer Drehzahlverstellung der Walzen 2. Letzlich wird durch die daraus resultierende Einstellung der Leitgeschwindigkeit v des Walzgerüstes 1, 5.1, 5.2, 5.3 ... 5. n wegen µ = f (v) der Reibungskoeffizient µ vorgegeben. Dieser Reibungskoeffizient µ wiederum beeinflußt die Auslaufdicke ha , womit der Regelkreis geschlossen ist.The invention is explained in more detail below on the basis of an exemplary embodiment illustrated in the figures.
The figure shows, in a highly simplified, schematic representation, the main components of a rolling mill in conjunction with a regulation of the outlet thickness h a of a strip to be rolled — not shown. A roll stand 1 is equipped with rolls 2 and a drive 3. The strip is rolled in a roll gap 4 by means of plastic forming to a target run-out thickness h a . Downstream of this last roll stand 1 of a further n stands 5.1, 5.2, 5.3 ... 5. n, the rolling train has a continuous or intermittent thickness measurement 6 of the outgoing strip. The measured value h a is fed to a control device 7 which acts on a master setpoint 8. The latter generates a manipulated variable that represents a measure of a rolling speed ν. This master setpoint is fed to all roll stands 1, 5.1, 5.2, 5.3 ... 5. n and, if necessary, also to the reels. This master setpoint acts on the respective drives - exemplified for the roll stand 1 as drive 3 - in the sense of a speed adjustment of the rolls 2. Ultimately, the resulting setting of the master speed v of the roll stand 1, 5.1, 5.2, 5.3 ... 5. n given µ = f ( v ) the coefficient of friction µ. This coefficient of friction μ in turn influences the outlet thickness h a , which closes the control loop.

Die Erfindung beschränkt sich nicht auf das vorstehend angegebene Ausführungsbeispiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche auch bei grundsätzlich anders gearteter Ausführung von den Merkmalen der Erfindung Gebrauch machen.The invention is not limited to the above Embodiment. Rather, a number of variants are conceivable which even if the execution is fundamentally different Make use of features of the invention.

Claims (4)

  1. Method of regulating the exit thickness ha of a rolled strip downstream of at least one roll stand (1, 5.1, 5.2, 5.3 ... 5.n), a setpoint deviation Δha of the exit thickness ha as a control input affecting a manipulated variable, characterized in that the coefficient of friction µ between roll stand (1, 5.1, 5.2, 5.3 ... 5.n) and rolled strip is provided as the manipulated variable.
  2. Method according to Claim 1, characterized in that the conveying speed v of the roll stand (1, 5.1, 5.2, 5.3 ... 5.n), µ = f (v) or a quantity derived therefrom is provided as the manipulated variable.
  3. Method according to Claim 2, characterized in that the speed n of a drive (3) of the roll stand (1, 5.1, 5.2, 5.3 ... 5.n) is provided as the manipulated variable.
  4. Method according to any of the preceding Claims, characterized in that the coefficient of friction µ or a quantity influencing said coefficient is fed as a manipulated variable to all roll stands (1, 5.1, 5.2, 5.3 ... 5.n) and winches by means of a transmitter (8).
EP99110932A 1998-06-05 1999-06-04 Method of regulating the exit thickness of a rolled strip Revoked EP0962266B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19825121A DE19825121A1 (en) 1998-06-05 1998-06-05 Process for regulating the outlet thickness of a rolled strip
DE19825121 1998-06-05

Publications (3)

Publication Number Publication Date
EP0962266A2 EP0962266A2 (en) 1999-12-08
EP0962266A3 EP0962266A3 (en) 2002-05-08
EP0962266B1 true EP0962266B1 (en) 2004-02-25

Family

ID=7869989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99110932A Revoked EP0962266B1 (en) 1998-06-05 1999-06-04 Method of regulating the exit thickness of a rolled strip

Country Status (3)

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EP (1) EP0962266B1 (en)
AT (1) ATE260150T1 (en)
DE (2) DE19825121A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03285719A (en) * 1990-04-02 1991-12-16 Sumitomo Metal Ind Ltd Measuring method for friction coefficient and deformation resistance of rolling mill
JPH07290126A (en) * 1994-04-27 1995-11-07 Hitachi Ltd Device for estimating friction coefficient
JP3443974B2 (en) * 1994-09-22 2003-09-08 住友金属工業株式会社 Roll gap setting method

Also Published As

Publication number Publication date
EP0962266A2 (en) 1999-12-08
DE59908616D1 (en) 2004-04-01
ATE260150T1 (en) 2004-03-15
DE19825121A1 (en) 1999-12-09
EP0962266A3 (en) 2002-05-08

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