EP0734795A1 - Method and device for feedforward thickness control in rolling of foils - Google Patents
Method and device for feedforward thickness control in rolling of foils Download PDFInfo
- Publication number
- EP0734795A1 EP0734795A1 EP96104291A EP96104291A EP0734795A1 EP 0734795 A1 EP0734795 A1 EP 0734795A1 EP 96104291 A EP96104291 A EP 96104291A EP 96104291 A EP96104291 A EP 96104291A EP 0734795 A1 EP0734795 A1 EP 0734795A1
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- Prior art keywords
- rolling
- thickness
- decoiler
- film
- control
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- 238000005096 rolling process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000011888 foil Substances 0.000 title claims abstract 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Classifications
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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
- B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
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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
- B21B37/48—Tension control; Compression control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/02—Tension
- B21B2265/04—Front or inlet tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
Definitions
- the invention relates to a method and an apparatus for thickness pre-control in film rolling with the aid of the characteristic curves of the individual manipulated variables (e.g. strip pulls, rolling speeds) stored in a process computer for different working points (operating states) or with the aid of an on-line physical computing model, also in combination with a monitor control.
- the individual manipulated variables e.g. strip pulls, rolling speeds
- the process computer for different working points (operating states) or with the aid of an on-line physical computing model, also in combination with a monitor control.
- the thickness during film rolling can no longer be controlled with the aid of a position control, since this fails due to the extraordinarily high strip modulus of the film, which also precludes the use of a thickness precontrol, which is customary in strip rolling and with which a thickness error can be reached in good time can change the rolling force or the position of the employment so that the outlet thickness remains as unchanged as possible.
- film rolling is only regulated by means of a combined retraction tension / rolling speed control.
- the mode of operation of the tension / speed control is based on a change in the resistance to deformation of the film, so that different decreases can be set with a constant rolling force.
- the invention is therefore based on the object of providing a method and a device of the type mentioned at the outset with which the consequences of a thickness deviation on the inlet side can be compensated for more quickly and better.
- This object is achieved for the method in that thickness deviations of the film are determined on the inlet side and compensated for by a thickness precontrol.
- the invention is based here on the knowledge gained both from practical experience and from theoretical studies that a good approximation of a deviation in the thickness of the film on the inlet side can be determined directly proportional to the reduction on the outlet side. Therefore, knowledge of the effects of a change in rolling parameters, obtained empirically or determined with the aid of a physico-mathematical calculation model, makes the thickness precontrol according to the invention possible for film rolling, i.e. a timely intervention in the rolling process in order not only to react to a measured thickness error with the monitor control, but to largely avoid it in advance.
- the rolling speed and / or the tension or retraction tension be changed, but preferably, under otherwise constant conditions, the strip retraction tension by a highly dynamic traction means, preferably a highly dynamic decoiler, depending on the operating point.
- the retraction voltage is the most effective manipulated variable for influencing the film thickness. While knowledge of the performance characteristics for classical film thickness control is advantageous but not absolutely necessary, it is assumed here that the effect of a manipulated variable change for the correct measurement of the pilot control step is known exactly have to be.
- the dependencies of the effects of a change in the inlet thickness on the manipulated variable, preferably the retraction voltage are determined at various operating points and stored in the process computer for the thickness control.
- An operating point is defined by a certain combination of process parameters, e.g. Outlet thickness, rolling speed, preferred tension, roller diameter or lubrication.
- the characteristic curves of the individual manipulated variables for various operating points are stored in the process computer and the characteristic curve that is valid for the actually prevailing operating state is obtained interpolatively from the family of characteristic curves stored in the process computer for different operating points (operating states).
- the difference quotient of the corresponding manipulated variable can then be determined from the characteristic curve itself. Alternatively, the difference quotients can also be determined directly using an online physical model.
- the regulation according to the invention by means of thickness precontrol is also able to evaluate whether a precontrol intervention or a possibly necessary intervention of a downstream thickness regulation with a certain manipulated variable is still possible or sensible. If, for example, the difference quotient tends towards infinity, this means that the manipulated variable has no effect and another manipulated variable must be used, for example the outlet tension or the rolling force in film rolling, the effect of which can be seen more indirectly through a shift in the working point .
- a device for carrying out the thickness precontrol according to the invention provides that between the decoiler and the rolling mill / the roll gap of the roll stand, a thickness measuring device connected to a higher-level process computer and this is followed by a change in the path of the film strip between the decoiler and the roll gap, e.g. extending traction means are arranged.
- a loop-forming brake and / or tension frame could be used, for example, as a traction means that changes the path length, but an advantageously force-controlled or position-controlled, hydraulically adjustable control roller is preferably proposed, for example the middle roller of a 3-roller bridge. This is because there is a highly dynamic traction device required for the timely changing of the retraction voltage; alternatively, the decoiler could also be used.
- the force or position-controlled control roller immersed in the strip run of the film to be rolled in front of the roll stand causes a change in the distance between the decoiler or the film strip bundle and the roll gap, i.e. an elastic change in the length of the film strip and, correspondingly, a change in tension depending on the working point.
- the thickness measuring device arranged for measuring the inlet thickness between the decoiler and the roll gap can be of a commercial type.
- the control roller can be returned to the neutral position by changing the retraction voltage setpoint and carrying the retraction voltage control window.
- the method can also be carried out directly using a highly dynamic reel.
- FIG. 1 shows a diagram of a system 1 for rolling a film or a film strip 2.
- the film strip 2 is drawn off from a collar 3 of a decoiler 4 and fed to the roll gap 5 of a roll stand 6 of a downstream rolling mill, not shown in detail.
- the roll stand 6 consists of an upper and a lower support roll 7 and the associated work rolls 8.
- a commercially available thickness measuring device 9 is arranged between the decoiler 4 and the rolling mill or stand 6 and is electrically connected to a superordinate process computer 10.
- the thickness measuring device 9 is followed by a traction means 11 arranged in front of the roll stand 6 in the form of a 3-roller bridge composed of three rollers 12 or 13.
- the middle roller 13 is designed as a force-controlled or position-controlled, hydraulically adjustable and also electrically connected to the process computer 10 control roller, which - as shown - dips into the film strip as required and influences the retraction tension by means of a change in the band loop 14.
- the process computer 10 In order to pre-control the thickness of the film strip 2 before it enters the rolling stand 6, the process computer 10 has stored, using a calculation model or empirically determined effect characteristics of the individual manipulated variables for different operating points, or the effect of the Actuating variables are calculated online.
- FIG. 2 shows another embodiment of a system 100 for rolling a film or a film strip 2.
- the sequence largely corresponds to that of system 1 according to FIG. 1, with the exception that the rapid retraction changes necessary for the thickness control are not by means of an intermediate traction means , but can be made directly with a highly dynamic reel 16.
- FIG. 3 An example of a thickness feedforward control in the system 1 or 100 according to FIG. 1 or FIG. 2, in order to compensate for an incoming change in film thickness with a constant outlet thickness (33 ⁇ m), constant rolling force (6000 kN) and constant rolling speed by suitably changing the retraction tension, is shown in the diagram of FIG. 3.
- a thickness feedforward control in the system 1 or 100 according to FIG. 1 or FIG. 2 in order to compensate for an incoming change in film thickness with a constant outlet thickness (33 ⁇ m), constant rolling force (6000 kN) and constant rolling speed by suitably changing the retraction tension, is shown in the diagram of FIG. 3.
- an increase in the inlet thickness of the film strip 2 from 72 ⁇ m to 74 ⁇ m is assumed.
- the control roller 13 of the traction means 11 is lowered into the tape run of the film 2 as shown in FIG. 1, so that an elastic change in length of the film tape 2 is brought about. This is done in a timely manner, ie with a high dynamic of the train change, which enables the adjustable, ie lowering and raising, control roller 13.
- the thickness measuring device 9 arranged between the decoiler 4 and the roll gap 5 or roll stand 6, an additive and based on the characteristic curve and of the run-in thickness error reach the measured change in tension, so that with the described control a thickness error is avoided in advance or largely reduced.
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Dickenvorsteuerung beim Folienwalzen mit Hilfe von in einem Prozeßrechner abgespeicherten Wirkungskennlinien der einzelnen Stellgrößen (z.B. Bandzüge, Walzgeschwindigkeiten) für verschiedene Arbeitspunkte (Betriebszustände) bzw. mit Hilfe eines on-line arbeitenden physikalischen Rechenmodells, auch in Kombination mit einer Monitorregelung.The invention relates to a method and an apparatus for thickness pre-control in film rolling with the aid of the characteristic curves of the individual manipulated variables (e.g. strip pulls, rolling speeds) stored in a process computer for different working points (operating states) or with the aid of an on-line physical computing model, also in combination with a monitor control.
Im Gegensatz zum Bandwalzen läßt sich die Dicke beim Folienwalzen nicht mehr mit Hilfe einer Positionsregelung regeln, da diese wegen des außerordentlich hohen Bandmoduls der Folie versagt, was auch den Einsatz einer beim Bandwalzen üblichen Dickenvorsteuerung ausschließt, mit der sich rechtzeitig mit dem Erreichen eines einlaufenden Dickenfehlers die Walzkraft bzw. die Position der Anstellung so verändern läßt, daß die Auslaufdicke möglichst unverändert bleibt. Beim Folienwalzen wird wegen des hohen Bandmoduls nur noch mittels einer kombinierten Rückzugsspannung-/Walzgeschwindigkeitsregelung geregelt. Die Wirkungsweise der Zug-/Geschwindigkeitsregelung basiert auf einer Veränderung des Umformwiderstandes der Folie, so daß sich bei konstanter Walzkraft unterschiedliche Abnahmen einstellen lassen.In contrast to strip rolling, the thickness during film rolling can no longer be controlled with the aid of a position control, since this fails due to the extraordinarily high strip modulus of the film, which also precludes the use of a thickness precontrol, which is customary in strip rolling and with which a thickness error can be reached in good time can change the rolling force or the position of the employment so that the outlet thickness remains as unchanged as possible. Due to the high strip module, film rolling is only regulated by means of a combined retraction tension / rolling speed control. The mode of operation of the tension / speed control is based on a change in the resistance to deformation of the film, so that different decreases can be set with a constant rolling force.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art zu schaffen, mit denen sich die Folgen einer einlaufseitigen Dickenabweichung schneller und besser kompensieren lassen.The invention is therefore based on the object of providing a method and a device of the type mentioned at the outset with which the consequences of a thickness deviation on the inlet side can be compensated for more quickly and better.
Diese Aufgabe wird für das Verfahren dadurch gelöst, daß Dickenabweichungen der Folie einlaufseitig ermittelt und durch eine Dickenvorsteuerung kompensiert werden. Der Erfindung liegt hierbei die sowohl durch praktische Erfahrungen als auch durch theoretische Untersuchungen gewonnene Erkenntnis zugrunde, daß in guter Näherung eine einlaufseitige Dickenabweichung der Folie direkt proportional zur Reduktion auch auslaufseitig feststellbar ist. Daher machen empirisch gewonnene oder mit Hilfe eines physikalisch-mathematischen Berechnungsmodells ermittelte Kenntnisse über die Auswirkungen einer Änderung von Walzparametern die erfindungsgemäße Dickenvorsteuerung für das Folienwalzen möglich, d.h. einen zeitgerechten Eingriff in den Walzprozeß, um nicht erst mit der Monitorregelung auf einen gemessenen Dickenfehler zu reagieren, sondern ihn bereits im voraus weitgehend zu vermeiden.This object is achieved for the method in that thickness deviations of the film are determined on the inlet side and compensated for by a thickness precontrol. The invention is based here on the knowledge gained both from practical experience and from theoretical studies that a good approximation of a deviation in the thickness of the film on the inlet side can be determined directly proportional to the reduction on the outlet side. Therefore, knowledge of the effects of a change in rolling parameters, obtained empirically or determined with the aid of a physico-mathematical calculation model, makes the thickness precontrol according to the invention possible for film rolling, i.e. a timely intervention in the rolling process in order not only to react to a measured thickness error with the monitor control, but to largely avoid it in advance.
Es wird vorgeschlagen, daß die Walzgeschwindigkeit und/oder die Vorzug- oder Rückzugspannung geändert, vorzugsweise jedoch bei ansonsten gleichbleibenden Bedingungen die Bandrückzugspannung durch ein hochdynamisches Zugmittel, vorzugsweise eine hochdynamische Ablaufhaspel, in Abhängigkeit vom Arbeitspunkt geändert wird. Analog zur Monitorregelung stellt nämlich die Rückzugspannung die wirksamste Stellgröße zur Beeinflussung der Foliendicke dar. Während die Kenntnis der Wirkungskennlinien für die klassische Foliendickenregelung zwar vorteilhaft, aber nicht zwingend notwendig ist, wird hier vorausgesetzt, daß die Auswirkung einer Stellgrößenänderung zur richtigen Bemessung des Vorsteuerungsschrittes genau bekannt sein muß. Zur richtigen Bemessung des Vorsteuerungsschrittes werden daher die Abhängigkeiten der Auswirkungen einer Einlaufdickenänderung von der Stellgröße, vorzugsweise der Rückzugspannung, an verschiedenen Arbeitspunkten ermittelt und in den Prozeßrechner für die Dickenregelung abgespeichert. Ein Arbeitspunkt ist definiert durch eine bestimmte Kombination von Prozeßparametern, z.B. Auslaufdicke, Walzgeschwindigkeit, Vorzugsspannung, Walzendurchmesser oder Schmierung.It is proposed that the rolling speed and / or the tension or retraction tension be changed, but preferably, under otherwise constant conditions, the strip retraction tension by a highly dynamic traction means, preferably a highly dynamic decoiler, depending on the operating point. Analogous to monitor control, the retraction voltage is the most effective manipulated variable for influencing the film thickness. While knowledge of the performance characteristics for classical film thickness control is advantageous but not absolutely necessary, it is assumed here that the effect of a manipulated variable change for the correct measurement of the pilot control step is known exactly have to be. In order to correctly dimension the pilot control step, the dependencies of the effects of a change in the inlet thickness on the manipulated variable, preferably the retraction voltage, are determined at various operating points and stored in the process computer for the thickness control. An operating point is defined by a certain combination of process parameters, e.g. Outlet thickness, rolling speed, preferred tension, roller diameter or lubrication.
Es läßt sich damit sowohl die notwendige Zahl als auch die Größe der Eingriffe der nachgeschalteten Dickenregelung so klein wie möglich halten, so daß sich entsprechend die durch die Regelung selbst induzierten Störungen des Walzprozesses entscheidend verringern lassen. Die mit Hilfe eines Berechnungsmodelles oder empirisch ermittelten Wirkungskennlinien der einzelnen Stellgrößen für verschiedene Arbeitspunkte sind im Prozeßrechner abgelegt und diejenige Kennlinie, die für den tatsächlich vorherrschenden Betriebszustand gültig ist, wird interpolativ aus der Schar der im Prozeßrechner für verschiedene Arbeitspunkte (Betriebszustände) hinterlegten Kennlinien gewonnen. Aus der Kennlinie selbst läßt sich dann der Differenzquotient der entsprechenden Stellgröße ermitteln. Alternativ lassen sich die Differenzquotienten auch direkt mit Hilfe eines on-line arbeitenden physikalischen Modells ermitteltn. Diese Differenzenquotienten geben an, welche Rückzugsspannungs- bzw. Stellgrößenänderung vorgenommen werden muß, um eine bestimmte Auslaufdickenänderung zu erreichen, z.B. 1 µm Auslaufdickenfehler ausgleichen zu können. Multiplikativ verknüpft mit dem aufgrund einer Einlaufdickenänderung zu erwartenden Auslaufdickenfehler erhält man dann die zur Fehlerkompensation notwendige Änderung der Stellgröße.It can be so small both the necessary number and the size of the interventions of the downstream thickness control keep as possible so that the disturbances of the rolling process induced by the control itself can be decisively reduced. The characteristic curves of the individual manipulated variables for various operating points, determined with the aid of a calculation model or empirically determined, are stored in the process computer and the characteristic curve that is valid for the actually prevailing operating state is obtained interpolatively from the family of characteristic curves stored in the process computer for different operating points (operating states). The difference quotient of the corresponding manipulated variable can then be determined from the characteristic curve itself. Alternatively, the difference quotients can also be determined directly using an online physical model. These difference quotients indicate which retraction voltage or manipulated variable change has to be made in order to achieve a specific change in outlet thickness, for example to be able to compensate for 1 µm outlet thickness errors. Multiplicatively linked to the discharge thickness error to be expected due to a change in the inlet thickness, the change in the manipulated variable required for error compensation is then obtained.
Die erfindungsgemäße Regelung mittels Dickenvorsteuerung ist darüber hinaus in der Lage bewerten zu können, ob ein Vorsteuerungseingriff oder ein unter Umständen notwendiger Eingriff einer nachgeschalteten Dickenregelung mit einer bestimmten Stellgröße noch möglich oder sinnvoll ist. Falls zum Beispiel der Differenzenquotient gegen unendlich strebt, bedeutet dies, daß die Stellgröße keine Wirkung mehr hat und eine andere Stellgröße herangezogen werden muß, beim Folienwalzen beispielsweise die Auslaufzugspannung oder auch die Walzkraft, deren Wirkung aber eher mittelbar durch eine Verlagerung des Arbeitspunktes zu sehen ist.The regulation according to the invention by means of thickness precontrol is also able to evaluate whether a precontrol intervention or a possibly necessary intervention of a downstream thickness regulation with a certain manipulated variable is still possible or sensible. If, for example, the difference quotient tends towards infinity, this means that the manipulated variable has no effect and another manipulated variable must be used, for example the outlet tension or the rolling force in film rolling, the effect of which can be seen more indirectly through a shift in the working point .
Es empfiehlt sich, den Sollwert der Stellgröße und das Stellgrößenregelfenster zur Rückführung des Stellmittels in eine neutrale Position oder auf einen neutralen Wert zu verschieben.It is advisable to move the setpoint of the manipulated variable and the manipulated variable control window to return the actuating means to a neutral position or to a neutral value.
Eine Vorrichtung zum Durchführen der erfindungsgemäßen Dickenvorsteuerung sieht vor, daß zwischen der Ablaufhaspel und dem Walzwerk/dem Walzspalt des Walzgerüstes ein an einen übergeordneten Prozeßrechner angeschlossenes Dickenmeßgerät und diesem nachgeschaltet ein den Weg des Folienbandes zwischen der Ablaufhaspel und dem Walzspalt veränderndes, z.B. verlängerndes Zugmittel angeordnet sind. Als ein die Weglänge veränderndes Zugmittel ließe sich beispielsweise ein schlaufenbildendes Brems- und/oder Zuggerüst einsetzen, vorzugsweise wird jedoch eine vorteilhaft kraft- oder positionsgeregelte, hydraulisch anstellbare Steuerrolle vorgeschlagen, beispielsweise die mittlere Rolle eines 3-Rollen-Bridles. Es liegt damit nämlich ein für das zeitgerechte Verändern der Rückzugspannung erforderliches hochdynamisches Zugmittel vor; alternativ ließe sich auch der Ablaufhaspel einsetzen.A device for carrying out the thickness precontrol according to the invention provides that between the decoiler and the rolling mill / the roll gap of the roll stand, a thickness measuring device connected to a higher-level process computer and this is followed by a change in the path of the film strip between the decoiler and the roll gap, e.g. extending traction means are arranged. A loop-forming brake and / or tension frame could be used, for example, as a traction means that changes the path length, but an advantageously force-controlled or position-controlled, hydraulically adjustable control roller is preferably proposed, for example the middle roller of a 3-roller bridge. This is because there is a highly dynamic traction device required for the timely changing of the retraction voltage; alternatively, the decoiler could also be used.
Die in den Bandlauf der zu walzenden Folie vor dem Walzgerüst eintauchende, kraft- oder positionsgeregelte Steuerrolle bewirkt eine Abstandsänderung zwischen der Ablaufhaspel bzw. dem Folienbandbund und dem Walzspalt, d.h. eine elastische Längenänderung des Folienbandes und damit einhergehend entsprechend eine Zugspannungsänderung in Abhängigkeit vom Arbeitspunkt. Das zur Einlaufdickenmessung zwischen der Ablaufhaspel und dem Walzspalt angeordnete Dickenmeßgerät kann handelsüblicher Art sein.The force or position-controlled control roller immersed in the strip run of the film to be rolled in front of the roll stand causes a change in the distance between the decoiler or the film strip bundle and the roll gap, i.e. an elastic change in the length of the film strip and, correspondingly, a change in tension depending on the working point. The thickness measuring device arranged for measuring the inlet thickness between the decoiler and the roll gap can be of a commercial type.
Durch das Verändern des Rückzugspannungssollwertes und das Mitführen des Rückzugspannungsregelfensters läßt sich die Steuerrolle in die neutrale Position zurückführen. Anstatt sich zur Rückzugsänderung mittels einer Steuerrolle die Trägheit der Haspel zu Nutzen zu machen, kann das Verfahren auch direkt mit Hilfe einer hochdynamischen Haspel durchgeführt werden.The control roller can be returned to the neutral position by changing the retraction voltage setpoint and carrying the retraction voltage control window. Instead of using the inertia of the reel to change the retraction by means of a control roller, the method can also be carried out directly using a highly dynamic reel.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den Ansprüchen und der nachfolgenden Beschreibung, in der ein in den Zeichnungen dargestelltes Ausführungsbeispiel der Erfindung näher erläutert ist. Es zeigen:
- Fig. 1
- eine Schemazeichnung einer Anlage zum Durchführen einer Dickenvorsteuerung beim Folienwalzen mittels einer Steuerrolle;
- Fig. 2
- eine Schemazeichnung einer Anlage zum Durchführen einer Dickenvorsteuerung beim Folienwalzen mittels einem hochdynamischen Haspel; und
- Fig. 3
- ein Diagramm (Kennlinie) zur Kompensation eines Einlaufdickensprunges durch zeitgerechtes Verändern der Rückzugspannung (am Beispiel einer theoretisch ermittelten Kennlinie).
- Fig. 1
- a schematic drawing of a system for performing a thickness feedforward control during film rolling by means of a control roller;
- Fig. 2
- a schematic drawing of a system for performing a thickness feedforward control during film rolling by means of a highly dynamic reel; and
- Fig. 3
- a diagram (characteristic curve) to compensate for an increase in the inlet thickness by changing the retraction voltage in time (using the example of a theoretically determined characteristic curve).
Die Fig. 1 zeigt ein Schema einer Anlage 1 zum Walzen einer Folie bzw. eines Folienbandes 2. Das Folienband 2 wird von einem Bund 3 einer Ablaufhaspel 4 abgezogen und dem Walzspalt 5 eines Walzgerüstes 6 eines nachgeschalteten, im einzelnen weiter nicht dargestellten Walzwerkes zugeführt. Das Walzgerüst 6 besteht aus einer oberen und einer unteren Stützwalze 7 sowie den dazugehörigen Arbeitswalzen 8.1 shows a diagram of a
Zwischen der Ablaufhaspel 4 und dem Walzwerk bzw. -gerüst 6 ist ein handelsübliches Dickenmeßgerät 9 angeordnet und elektrisch mit einem übergeordneten Prozeßrechner 10 verbunden. Dem Dickenmeßgerät 9 ist ein vor dem Walzgerüst 6 angeordnetes Zugmittel 11 in Form eines sich aus drei Rollen 12 bzw. 13 zusammensetzenden 3-Rollen-Bridles nachgeschaltet. Die mittlere Rolle 13 ist als kraft- oder positionsgeregelte, hydraulisch angstellbare und elektrisch ebenfalls mit dem Prozeßrechner 10 verbundene Steuerrolle ausgebildet, die - wie dargestellt - bedarfweise in das Folienband eintaucht und mittels einer Veränderung der Bandschlaufe 14 die Rückzugspannung beeinflußt.A commercially available thickness measuring device 9 is arranged between the
Zur Dickenvorsteuerung des Folienbandes 2, bevor dieses in das Walzgerüst 6 einläuft, sind in dem Prozeßrechner 10 mit Hilfe eines Berechnungsmodelles oder empirisch ermittelte Wirkungskennlinien der einzelnen Stellgrößen für verschiedene Arbeitspunkte abgespeichert worden oder die Wirkung der Stellgrößen wird on-line berechnet.In order to pre-control the thickness of the
Die Fig. 2 zeigt eine andere Ausführung einer Anlage 100 zum Walzen einer Folie bzw. eines Folienbandes 2. Der Ablauf entspricht weitgehend dem der Anlage 1 nach Fig. 1 mit der Ausnahme, daß die für die Dickenvorsteuerung notwendigen schnellen Rückzugänderungen nicht mittels eines zwischengeschalteten Zugmittels, sondern direkt mit einer hochdynamischen Haspel 16 vorgenommen werden.FIG. 2 shows another embodiment of a
Ein Beispiel für eine Dickenvorsteuerung bei der Anlage 1 bzw. 100 nach Fig. 1 bzw. Fig. 2, um durch geeignete Veränderung der Rückzugspannung eine einlaufende Foliendickenänderung bei konstanter Auslaufdicke (33 mym), konstanter Walzkraft (6000 kN) und konstanter Walzgeschwindigkeit auszugleichen, ist in dem Diagramm nach Fig. 3 gezeigt. Um die nachfolgend beschriebene Kompensation der Dickenabweichung des einlaufenden Folienbandes 2 zu verdeutlichen, wird ein Einlaufdickensprung des Folienbandes 2 von 72 µm auf 74 µm angenommen.An example of a thickness feedforward control in the
Dieser Einlaufdickensprung und die gültige Kennlinie des definierten Arbeitspunktes, die interpolativ aus der Vielzahl der im Prozeßrechner 10 abgespeicherten Wirkungskennlinien oder unmittelbar mittels eines physikalischen Prozeßmodelles gewonnen wird, erlauben es, den Dickensprung durch zeitgerechtes Erhöhen der Rückzugspannung von 50 N/mm2 auf 55 N/mm2 zu kompensieren; der beispielhaft gewählte Regelbereich wird durch die in Fig. 4 unterbrochene Regelungskennlinie 17 hervorgehoben.This increase in the inlet thickness and the valid characteristic of the defined operating point, which is obtained interpolatively from the large number of effect characteristics stored in the
Zur Erhöhung der Rückzugspannung auf 55 N/mm2 wird - am Beispiel der Fig. 1 - die Steuerrolle 13 des Zugmittels 11 wie in Fig. 1 gezeigt in den Bandlauf der Folie 2 abgesenkt, so daß eine elastische Längenänderung des Folienbandes 2 bewirkt wird. Dies geschieht zeitgerecht, d.h. mit einer hohen Dynamik der Zugänderung, die die anstellbare, d.h. absenk- und anhebbare Steuerrolle 13 ermöglicht. Durch die Einlaufdickenmessung des Folienbandes mittels des zwischen der Ablaufhaspel 4 und dem Walzspalt 5 bzw. Walzgerüst 6 angeordneten Dickenmeßgerätes 9 läßt sich somit eine additive und anhand der Kennlinie und des Einlaufdickenfehlers bemessene Zugänderung erreichen, so daß mit der beschriebenen Regelung ein Dickenfehler bereits im voraus vermieden bzw. weitgehend verringert wird.To increase the retraction tension to 55 N / mm 2 - using the example of FIG. 1 - the
Claims (10)
dadurch gekennzeichnet,
daß Dickenabweichungen der Folie einlaufseitig ermittelt und durch eine Dickenvorsteuerung kompensiert werden.Method for regulating the thickness of film rolling with the aid of the characteristic curves of the individual manipulated variables (eg strip tension, rolling speeds) stored in a process computer for various operating points, also in combination with a monitor control
characterized by
that deviations in the thickness of the film are determined on the inlet side and compensated for by a thickness precontrol.
dadurch gekennzeichnet,
daß unter Beibehaltung der anderen Walzparameter die Stellgröße, vorzugsweise die Bandzugspannung, durch ein hochdynamisches Stellmittel in Abhängigkeit vom Arbeitspunkt geändert wird.Method according to claim 1,
characterized by
that while maintaining the other rolling parameters, the manipulated variable, preferably the strip tension, is changed by a highly dynamic actuating means as a function of the operating point.
dadurch gekennzeichnet,
daß der Sollwert der Stellgröße und das Stellgrößenregelfenster zur Rückführung des Stellmittels in eine neutrale Position oder auf einen neutralen Wert verschoben wird.Method according to claim 2,
characterized by
that the setpoint of the manipulated variable and the manipulated variable control window for returning the actuating means are shifted to a neutral position or to a neutral value.
dadurch gekennzeichnet,
daß die Bandrückzugspannung durch einen hochdynamischen Ablaufhaspel in Abhängigkeit vom Arbeitspunkt geändert wird.Method according to claim 1,
characterized by
that the tape retraction tension is changed by a highly dynamic decoiler depending on the operating point.
dadurch gekennzeichnet,
daß zwischen der Ablaufhaspel (4) und dem Walzwerk (6) bzw. dem Walzspalt (5) des Walzgerüstes ein an einen übergeordneten Prozeßrechner angeschlossenes Dickenmeßgerät (9) und diesem nachgeschaltet ein den Weg des Folienbandes (2) zwischen der Ablaufhaspel (4) und dem Walzspalt (5) veränderndes Zugmittel (11) angeordnet sind.Device for regulating the thickness during the rolling of a foil strip (2) entering from a decoiler (4; 16) into a rolling mill (6), in particular for carrying out the method according to claim 1,
characterized by
that between the decoiler (4) and the rolling mill (6) or the roll gap (5) of the roll stand a thickness measuring device (9) connected to a higher-level process computer and this is followed by a path of the film strip (2) between the decoiler (4) and the rolling gap (5) changing traction means (11) are arranged.
dadurch gekennzeichnet,
daß das Zugmittel (11) eine Steuerrolle (13) aufweist.Device according to claim 5,
characterized by
that the traction means (11) has a control roller (13).
dadurch gekennzeichnet,
daß die Steuerrolle (13) kraftgeregelt ist.Apparatus according to claim 6,
characterized by
that the control roller (13) is force-controlled.
dadurch gekennzeichnet,
daß die Steuerrolle (13) positionsgeregelt ist.Apparatus according to claim 6,
characterized by
that the control roller (13) is position-controlled.
dadurch gekennzeichnet,
daß die Steuerrolle (13) hydraulisch anstellbar ist.Device according to one of claims 6 to 8,
characterized by
that the control roller (13) is hydraulically adjustable.
dadurch gekennzeichnet,
daß das Zugmittel (11) ein hochdynamischer Ablaufhaspel (16) ist.Device according to claim 5,
characterized by
that the traction means (11) is a highly dynamic decoiler (16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19511801A DE19511801A1 (en) | 1995-03-30 | 1995-03-30 | Method and device for thickness control in film rolling |
| DE19511801 | 1995-03-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0734795A1 true EP0734795A1 (en) | 1996-10-02 |
| EP0734795B1 EP0734795B1 (en) | 2000-01-26 |
Family
ID=7758235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96104291A Expired - Lifetime EP0734795B1 (en) | 1995-03-30 | 1996-03-19 | Method for feedforward thickness control in rolling of foils |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5771724A (en) |
| EP (1) | EP0734795B1 (en) |
| JP (1) | JP3697313B2 (en) |
| KR (1) | KR100394489B1 (en) |
| AT (1) | ATE189140T1 (en) |
| CA (1) | CA2173049C (en) |
| DE (2) | DE19511801A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100775462B1 (en) * | 2001-09-05 | 2007-11-12 | 주식회사 포스코 | Rolling method of slab |
| DE102006008574A1 (en) * | 2006-02-22 | 2007-08-30 | Siemens Ag | Reducing the influence of roller excentricity on the thickness of a rolled material, comprises identifying the roller excentricity and determining a correction signal for a control unit |
| CN101934289B (en) * | 2009-06-30 | 2013-12-25 | 上海宝信软件股份有限公司 | Adjusting method of stainless-steel cold continuous-rolling roll gap |
| CN104324951B (en) * | 2013-07-22 | 2016-08-24 | 宝山钢铁股份有限公司 | Single chassis starts rolling force setup and control method |
| CN103801563A (en) * | 2014-01-22 | 2014-05-21 | 江苏亨特宏业重工有限公司 | Fixed roller device of aluminum foil mill |
| CN104492828A (en) * | 2014-12-27 | 2015-04-08 | 陆余圣 | Laser displacement induction device for rolling machine and using method of laser displacement induction device |
| TWI580489B (en) * | 2015-10-07 | 2017-05-01 | Metal Ind Res And Dev Centre | Sheet thickness precision control equipment |
| ITUB20169972A1 (en) * | 2016-01-14 | 2017-07-14 | Guasta Fabrizio | Aluminum foil rolling process |
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| JPS57103724A (en) * | 1980-12-19 | 1982-06-28 | Hitachi Ltd | Automatic thickness controlling system in metallic foil rolling mill |
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| JPH0246918A (en) * | 1988-08-04 | 1990-02-16 | Showa Alum Corp | Automatic control method for rolling foil or the like |
| JPH02268913A (en) * | 1989-04-06 | 1990-11-02 | Kobe Steel Ltd | Rolling mill equipped with device for absorbing variation of tension on inlet side |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU858955A1 (en) * | 1979-08-17 | 1981-08-30 | за вители А,П. Грудев, А.Д. Размахнин, К. А. Ивано|в В.Г. Шув ков, В.А. Сорокин и Г.В. Фот 5с&. ::п:;;-/7-: | Continuous rolling mill |
| JPS5650709A (en) * | 1979-09-29 | 1981-05-08 | Sumitomo Metal Ind Ltd | Preventing method for fluctuation of finished breadth in hot strip mill |
| JPS5841602A (en) * | 1981-09-03 | 1983-03-10 | Sumitomo Metal Ind Ltd | Cold rolling method |
| CH663555A5 (en) * | 1984-02-06 | 1987-12-31 | Escher Wyss Ag | METHOD AND DEVICE FOR ROLLING ALUMINUM FILMS. |
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1995
- 1995-03-30 DE DE19511801A patent/DE19511801A1/en not_active Withdrawn
-
1996
- 1996-03-19 EP EP96104291A patent/EP0734795B1/en not_active Expired - Lifetime
- 1996-03-19 AT AT96104291T patent/ATE189140T1/en active
- 1996-03-19 DE DE59604264T patent/DE59604264D1/en not_active Expired - Lifetime
- 1996-03-29 KR KR1019960009089A patent/KR100394489B1/en not_active IP Right Cessation
- 1996-03-29 US US08/625,730 patent/US5771724A/en not_active Expired - Lifetime
- 1996-03-29 CA CA002173049A patent/CA2173049C/en not_active Expired - Fee Related
- 1996-03-29 JP JP07712196A patent/JP3697313B2/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2173049A1 (en) | 1996-10-01 |
| EP0734795B1 (en) | 2000-01-26 |
| KR100394489B1 (en) | 2003-12-24 |
| US5771724A (en) | 1998-06-30 |
| CA2173049C (en) | 2007-06-12 |
| DE59604264D1 (en) | 2000-03-02 |
| ATE189140T1 (en) | 2000-02-15 |
| KR960033578A (en) | 1996-10-22 |
| JPH08281313A (en) | 1996-10-29 |
| DE19511801A1 (en) | 1996-10-02 |
| JP3697313B2 (en) | 2005-09-21 |
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