EP2328697B1 - Operating method for a stretch leveler with superimposed elongation control and subordinate tension control - Google Patents

Operating method for a stretch leveler with superimposed elongation control and subordinate tension control Download PDF

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Publication number
EP2328697B1
EP2328697B1 EP09779474A EP09779474A EP2328697B1 EP 2328697 B1 EP2328697 B1 EP 2328697B1 EP 09779474 A EP09779474 A EP 09779474A EP 09779474 A EP09779474 A EP 09779474A EP 2328697 B1 EP2328697 B1 EP 2328697B1
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Prior art keywords
controller
speed
desired value
elongation
output
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German (de)
French (fr)
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EP2328697B2 (en
EP2328697A1 (en
Inventor
Ralf Smukalski
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Primetals Technologies Germany GmbH
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Siemens AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling

Definitions

  • the present invention further relates to a computer program for a control device of a drafting jig, the computer program comprising machine commands that are directly executable by the control device, wherein the execution of the machine commands by the control device causes the control device to operate the drafting jig according to such an operating method.
  • the present invention further relates to a control device for a stretcher, wherein the control device is designed such that it has at least one operating mode in which it operates the stretcher according to such an operating method.
  • Such an operating method and the associated stretcher are from the JP 11 347 630 A known.
  • a strip tension control in a treatment line for a material strip which has a number of treatment areas.
  • separation roller sets are arranged in front of the first treatment area, between the treatment areas and behind the last treatment area.
  • the belt trains which are present in the treatment areas are detected and used in conjunction with a respective desired train for regulating the speed difference between the separation roller set upstream of the respective treatment area and the separation roller set arranged downstream of the respective treatment area.
  • Stretching funnels of the type described above are generally operated alternatively in Wergmode or Elongationsregelmode.
  • Switzerlandregelmode there is no elongation of the band.
  • the output speed is equal to the input speed.
  • the corresponding speed setpoints also match.
  • the tape tension is not regulated in the prior art.
  • the strip tension is monitored for compliance with an absolute value. If the absolute strip tension exceeds a maximum permissible strip tension, the elongation setpoint is reduced in order to lower the strip tension again. If the absolute strip tension falls below the maximum permissible strip tension, the elongation setpoint is slowly increased back to the original elongation setpoint via a ramp function.
  • Another problem of the prior art is that during common changes in the speed setpoints, ie during acceleration and deceleration of the belt, strong deviations of the actual actual elongation from the elongation setpoint occur.
  • the object of the present invention is to provide possibilities by means of which vibrations in the current strip tension and in the elongation setpoint can be intercepted in a simple manner and, if possible, also the deviations in the actual elongation during acceleration and deceleration processes can be reduced.
  • the elongation controller and the draft regulator can be designed as required. It is currently preferred that the elongation controller is designed as a PI controller and that the tension controller is designed as a P controller or as a PI controller.
  • the output-side speed setpoint by multiplying the input side Velocity setpoint is determined with the elongation setpoint.
  • the object is further achieved by a computer program having the features of claim 5.
  • the execution of the machine commands by the control device causes the control device to operate the stretcher according to an operating method according to the invention.
  • the computer program can be stored on a mobile data carrier. Alternatively, it may be stored in the controller.
  • control device having the features of claim 8.
  • the control device is thus designed such that it has at least one operating mode in which it operates the stretcher according to an operating method according to the invention.
  • the object is achieved by a stretcher with the features of claim 12.
  • the stretcher has a control device designed according to the invention.
  • a stretch leveler comprises an input-side conveyor element 1, a bending element 2, and an output-side conveyor element 3.
  • the input-side conveyor element 1 and the output-side conveyor element 3, optionally also the bending element 2, are controlled by a control device 4.
  • the input-side conveyor element 1 is usually designed as an S-roller set. It may have two or more than two rollers 5a to 5d. Is shown in FIG. 1 an embodiment of the input-side conveyor element 1 with four rollers 5a to 5d. This embodiment is common in the context of the present invention, but not mandatory.
  • the rollers 5a to 5d of the input-side conveyor element 1 are at least partially driven.
  • the roller 5d that is, the bending member 2 immediately upstream roller 5d, is driven.
  • the input-side conveyor element 1 leads to the bending element 2 a band 6.
  • the band 6 is usually a metal band 6, for example a steel, aluminum or copper band. In some cases, the band 6 may also be formed as a textile band.
  • the feeding of the belt 6 to the bending element 2 takes place with an input speed v1.
  • an input-side speed controller 7 is provided to which the input speed v1 and an input-side speed setpoint v1 * are supplied.
  • the input-side speed controller 7 causes the input-side conveyor element 1 is controlled to the input-side speed setpoint v1. It outputs for this purpose a suitable control signal S1 to the input-side conveyor element 1. For example, it can control a drive of the roller 5d accordingly.
  • the output-side conveyor element 3 is usually designed as an S-roller set. Analogously to the input-side conveying element 1, the S-roller set may have two or more than two rollers 8a to 8d. Shown in FIG. 1 four rollers 8a to 8d. This embodiment is common in the context of the present invention, but not mandatory.
  • rollers 8a to 8d of the output-side conveyor element 3 are at least partially driven.
  • the innermost roller 8a that is, the bending element 2 immediately downstream roller 8a, is driven.
  • an output-side speed controller 9 is provided to which the output speed v2 and an output-side speed setpoint v2 * are supplied.
  • the output-side speed controller 9 causes the output-side conveyor element 3 to the output-side speed setpoint v2 * is regulated. It outputs for this purpose a suitable actuating signal S2 to the output-side conveyor element 3. For example, it can drive a drive of the roller 8a accordingly.
  • the bending element 2 has a number of rollers 10. Shown in FIG. 1 however, the number of rollers 10 of the flexure 2 could alternatively be greater or less than five.
  • the rollers 10 are not driven in the rule. They could, however, be powered.
  • the rollers 10 of the bending element 2 are employed on the belt 6. By means of the rollers 10, the band 6 is deflected in the bending element 2 alternately up and down.
  • the stretcher is usually operated, inter alia, in a Switzerlandregelmode.
  • the output-side speed setpoint v2 * is equal to the input-side speed setpoint v1 *.
  • an actual tension value Z is detected, which prevails in the belt 6 between the conveying elements 1, 3.
  • the actual train value Z is regulated to a train setpoint Z *.
  • the Switzerlandregelmode may also be possible in the context of the present invention. This is not important. It is crucial that the stretcher be operated (at least among others) in a Elongationsregelmode.
  • the elongation control mode will be explained in more detail below.
  • the output-side speed setpoint v2 * is greater than the input-side speed setpoint v1 *.
  • the output speed v2 is also greater than the input speed v1.
  • the speed difference between the output speed v2 and the input speed v1 is in this case such that the belt 6 is plastically stretched between the conveyor elements 1, 3.
  • the input speed v1 and the output speed v2 are detected.
  • the detection takes place by means of corresponding speed detection elements 12, 13.
  • the speeds v1, v2 of the outer rollers 5a, 8d are detected.
  • the detected velocities v1, v2 are supplied not only to the speed controllers 7, 9, but also to an elongation detector 14 which determines an elongation actual value e for the band 6 on the basis of the input speed v1 and the initial speed v2.
  • the elongation actual value e and an elongation setpoint e * (with e *> 1) are fed to an elongation controller 15.
  • the elongation controller 15 determines a train setpoint Z * based on the values e, e * supplied to it.
  • the elongation controller 15 can be of any desired design, for example as a P controller, as a PI controller, as a PID controller, as a PT1 controller or as a PT2 controller. Usually, the elongation controller 15 is designed as a PI controller.
  • the tension controller 16 is further supplied with the Weristwert Z.
  • the Buchistwert Z can in this case by means of the Werer conductedselements 11 or otherwise detected by means of another, not shown train detection element.
  • the tension controller 16 determines a speed addition setpoint ⁇ v * based on the values Z and Z * or Z and ZMAX * supplied to it.
  • the tension regulator 16 can be designed as desired for this purpose.
  • the above statements on the design of the elongation controller 15 are analogously applicable.
  • the tension controller 16 is designed either as a P controller or as a PI controller. Both embodiments are in FIG. 1 shown. However, since both embodiments are alternative to each other, both embodiments are in FIG. 1 shown only by dashed lines.
  • the additional speed setpoint value ⁇ v * is fed to a connection element 18.
  • the Aufschaltelement 18 is further supplied to the output side speed setpoint v2 *.
  • the connection element 18 switches on the additional speed setpoint value ⁇ v * to the output speed setpoint value v2 *.
  • the output speed setpoint v2 * can in principle be determined in any way.
  • the output-side speed setpoint v2 * may first be set equal to the input-side speed setpoint v1 * or may differ from the input-side speed setpoint v1 * by a fixed value.
  • the input-side speed command value v1 * and the elongation command value e * are supplied to a multiplier 19.
  • the multiplier 19 determines the output-side speed command value v2 * by multiplying the input-side speed command value v1 * by the elongation command value e *.
  • control device 4 as shown in FIG. 1 is built in hardware. Often, however, the control device 4 according to the representation of FIG. 2 designed as a software programmable controller. In this case, the control device 4 has a processor 20, which executes a computer program 21. The computer program 21 in this case determines the mode of action of the control device 4.
  • the computer program 21 comprises according to FIG. 2 Machine commands 22, which are directly abaillebar by the control device 4 (more precisely: by the processor 20 of the control device 4).
  • the execution of the machine commands 22 by the control device 4 causes the control device 4 to operate the stretcher as described above in connection with FIG FIG. 1 was explained.
  • the computer program 21 must be stored in an internal memory 23 of the control device 4. At this time, the computer program 21 is thus stored in the control device 4. However, the feeding of the computer program 21 to the control device 4 can take place in various ways.
  • the control device 4 must have a corresponding interface for the mobile data carrier 24.
  • the mobile data carrier 24 can be designed as needed. For example, it can be used as a CD-ROM, as an SD memory card or as shown in FIG. 2 be designed as a USB memory stick.
  • control device 4 it is possible to supply the computer program 21 of the control device 4 via a computer-computer connection 25.
  • the control device 4 must have a corresponding interface to the computer-computer connection 25.
  • the computer-computer connection 25 may for example be a LAN or a larger computer network, in particular the World Wide Web.
  • the present invention has many advantages.
  • a stable, vibration-free behavior of the stretch leveler can be achieved.
  • the strong deviations between elongation setpoint e * and elongation actual value e which occur in the prior art, can be significantly reduced. In tests, the deviations could be reduced to approx. 20% of the previous deviation.
  • the elongation actual value e also follows the elongation setpoint e * quickly and without appreciable overshoot when the elongation setpoint e * changes.
  • the stretch leveler runs more stable. As a result, a significant production and quality improvement can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Control Of Metal Rolling (AREA)

Description

Die vorliegende Erfindung betrifft ein Betriebsverfahren für einen Streckrichter, der ein eingangsseitiges Förderelement, ein Biegeelement und ein ausgangsseitiges Förderelement umfasst,

  • wobei dem Biegeelement vom eingangsseitigen Förderelement mit einer Eingangsgeschwindigkeit ein Band, insbesondere ein Metallband, zugeführt wird,
  • wobei das Band vom ausgangsseitigen Förderelement mit einer Ausgangsgeschwindigkeit aus dem Biegeelement abgeführt wird,
  • wobei die Ausgangsgeschwindigkeit größer als die Eingangsgeschwindigkeit ist, so dass das Band plastisch gestreckt wird,
  • wobei das Band im Biegeelement mittels an das Band angestellter Rollen des Biegeelements alternierend nach oben und unten ausgelenkt wird,
  • wobei das eingangsseitige Förderelement auf einen eingangsseitigen Geschwindigkeitssollwert und das ausgangsseitige Förderelement auf einen ausgangsseitigen Geschwindigkeitssollwert geregelt werden,
  • wobei die Eingangsgeschwindigkeit und die Ausgangsgeschwindigkeit erfasst werden und aus ihnen ein Elongationsistwert für das Band ermittelt wird,
  • wobei der Elongationsistwert und ein Elongationssollwert einem Elongationsregler zugeführt werden.
The present invention relates to an operating method for a drafting jig comprising an input-side conveying element, a bending element and an output-side conveying element,
  • the strip element being fed from the input-side conveying element at an input speed to a strip, in particular a metal strip,
  • wherein the belt is removed from the output side conveyor at an output speed from the flexure,
  • wherein the initial speed is greater than the input speed, so that the belt is stretched plastically,
  • the strip being deflected alternately up and down in the bending element by means of rolls of the bending element which are employed on the strip,
  • wherein the input-side conveying element is controlled to an input-side speed setpoint and the output-side conveying element to an output-side speed setpoint,
  • wherein the input speed and the output speed are detected and from which an elongation actual value for the band is determined,
  • wherein the Elongationsistwert and a Elongationssollwert be fed to a Elongationsregler.

Die vorliegende Erfindung betrifft weiterhin ein Computerprogramm für eine Steuereinrichtung eines Streckrichters, wobei das Computerprogramm Maschinenbefehle umfasst, die von der Steuereinrichtung unmittelbar abarbeitbar sind, wobei die Abarbeitung der Maschinenbefehle durch die Steuereinrichtung bewirkt, dass die Steuereinrichtung den Streckrichter gemäß einem derartigen Betriebsverfahren betreibt.The present invention further relates to a computer program for a control device of a drafting jig, the computer program comprising machine commands that are directly executable by the control device, wherein the execution of the machine commands by the control device causes the control device to operate the drafting jig according to such an operating method.

Die vorliegende Erfindung betrifft weiterhin eine Steuereinrichtung für einen Streckrichter, wobei die Steuereinrichtung derart ausgebildet ist, dass sie mindestens einen Betriebsmode aufweist, in dem sie den Streckrichter gemäß einem derartigen Betriebsverfahren betreibt.The present invention further relates to a control device for a stretcher, wherein the control device is designed such that it has at least one operating mode in which it operates the stretcher according to such an operating method.

Schließlich betrifft die vorliegende Erfindung einen Streckrichter für ein Band, insbesondere ein Metallband,

  • wobei der Streckrichter ein eingangsseitiges Förderelement, ein Biegeelement und ein ausgangsseitiges Förderelement umfasst,
  • wobei das Band dem Biegeelement vom eingangsseitigen Förderelement zuführbar ist,
  • wobei das Band vom ausgangsseitigen Förderelement aus dem Biegeelement abführbar ist,
  • wobei das Band im Biegeelement mittels an das Band angestellter Rollen des Biegeelements alternierend nach oben und unten auslenkbar ist,
  • wobei der Streckrichter eine Steuereinrichtung aufweist.
Finally, the present invention relates to a stretcher for a strip, in particular a metal strip,
  • the stretcher comprises an input-side conveyor element, a bending element and an output-side conveyor element,
  • wherein the band is fed to the bending element from the input-side conveyor element,
  • wherein the band is dischargeable from the output side conveying element of the bending element,
  • wherein the band in the bending element is alternately deflectable upwards and downwards by means of rollers of the bending element which are employed on the belt,
  • wherein the stretcher comprises a control device.

Ein derartiges Betriebsverfahren und der zugehörige Streckrichter sind aus der JP 11 347 630 A bekannt.Such an operating method and the associated stretcher are from the JP 11 347 630 A known.

Bei der genannten JP-Schrift scheint anhand des Vergleichs direkt der ausgangsseitige Geschwindigkeitssollwert nachgeführt zu werden.In the case of the cited JP document, the comparison of the speed setpoint on the output side seems to be tracked directly on the basis of the comparison.

Aus der DE 103 42 798 B3 ist eine Bandzugregelung in einer Behandlungslinie für ein Materialband bekannt, die eine Anzahl von Behandlungsbereichen aufweist. Zur Zugentkopplung sind vor dem ersten Behandlungsbereich, zwischen den Behandlungsbereichen und hinter dem letzten Behandlungsbereich Trennrollensätze angeordnet. Die in den Behandlungsbereichen anstehenden Bandzüge werden erfasst und in Verbindung mit einem jeweiligen Sollzug zur Regelung der Geschwindigkeitsdifferenz zwischen dem dem jeweiligen Behandlungsbereich vorgeordneten und dem dem jeweiligen Behandlungsbereich nachgeordneten Trennrollensatz verwendet.From the DE 103 42 798 B3 For example, a strip tension control in a treatment line for a material strip is known which has a number of treatment areas. For decoupling separation roller sets are arranged in front of the first treatment area, between the treatment areas and behind the last treatment area. The belt trains which are present in the treatment areas are detected and used in conjunction with a respective desired train for regulating the speed difference between the separation roller set upstream of the respective treatment area and the separation roller set arranged downstream of the respective treatment area.

Bei Streckrichtern besteht oftmals keine mechanische Kopplung des eingangsseitigen Förderelements und des ausgangsseitigen Förderelements über ein Getriebe oder eine Welle. Die einzige mechanische Kopplung der Förderelemente miteinander besteht über das Band.With stretch levelers there is often no mechanical coupling of the input-side conveyor element and the output-side conveyor element via a gear or a shaft. The only mechanical coupling of the conveyor elements together is via the belt.

Streckrichter der obenstehend beschriebenen Art werden in der Regel alternativ im Zugregelmode oder im Elongationsregelmode betrieben. Im Zugregelmode erfolgt keine Elongation des Bandes. Die Ausgangsgeschwindigkeit ist gleich der Eingangsgeschwindigkeit. Auch stimmen die korrespondierenden Geschwindigkeitssollwerte überein.Stretching funnels of the type described above are generally operated alternatively in Zugregelmode or Elongationsregelmode. In Zugregelmode there is no elongation of the band. The output speed is equal to the input speed. The corresponding speed setpoints also match.

Im Elongationsregelmode wird im Stand der Technik der Bandzug nicht geregelt. Der Bandzug wird jedoch auf Einhalten eines Absolutwertes überwacht. Überschreitet der absolute Bandzug einen maximal zulässigen Bandzug, wird der Elongationssollwert reduziert, um den Bandzug wieder zu senken. Unterschreitet der absolute Bandzug den maximal zulässigen Bandzug, wird der Elongationssollwert langsam über eine Rampenfunktion wieder auf den ursprünglichen Elongationssollwert erhöht.In Elongationsregelmode the tape tension is not regulated in the prior art. However, the strip tension is monitored for compliance with an absolute value. If the absolute strip tension exceeds a maximum permissible strip tension, the elongation setpoint is reduced in order to lower the strip tension again. If the absolute strip tension falls below the maximum permissible strip tension, the elongation setpoint is slowly increased back to the original elongation setpoint via a ramp function.

Im Stand der Technik kommt es oftmals vor, dass diese Sicherheitsfunktion zu Schwingungen im Elongationssollwert und im aktuellen Bandzug führt. Trotz verschiedener Rampenfunktionen, Einschaltverzögerungen, Ausschaltverzögerungen und anderen logischen Funktionen kommt es im Stand der Technik - zumindest bei bestimmten Materialien - zu einem ständigen Wechsel zwischen Reduzieren und Erhöhen des Elongationssollwerts. Diese Schwingung findet im Stand der Technik oftmals über mehrere Minuten statt.In the prior art, it often happens that this safety function leads to oscillations in the elongation setpoint and in the current strip tension. Despite various ramp functions, switch-on delays, switch-off delays and other logic functions, in the prior art - at least for certain materials - there is a constant change between reducing and increasing the elongation setpoint. This oscillation often takes place in the prior art over several minutes.

Ein weiteres Problem des Standes der Technik besteht darin, dass während gemeinsamer Änderungen der Geschwindigkeitssollwerte, also beim Beschleunigen und Abbremsen des Bandes, starke Abweichungen der tatsächlichen Istelongation vom Elongationssollwert auftreten.Another problem of the prior art is that during common changes in the speed setpoints, ie during acceleration and deceleration of the belt, strong deviations of the actual actual elongation from the elongation setpoint occur.

Die Aufgabe der vorliegenden Erfindung besteht darin, Möglichkeiten zu schaffen, mittels derer auf einfache Weise Schwingungen im aktuellen Bandzug und im Elongationssollwert abgefangen werden können und nach Möglichkeit auch die Abweichungen in der Istelongation während Beschleunigungs- und Verzögerungsvorgängen reduziert werden können.The object of the present invention is to provide possibilities by means of which vibrations in the current strip tension and in the elongation setpoint can be intercepted in a simple manner and, if possible, also the deviations in the actual elongation during acceleration and deceleration processes can be reduced.

Die Aufgabe wird durch ein Betriebsverfahren mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen des Betriebsverfahrens sind Gegenstand der abhängigen Ansprüche 2 bis 4.The object is achieved by an operating method with the features of claim 1. Advantageous embodiments of the operating method are the subject of the dependent claims 2 to 4.

Erfindungsgemäß werden bei dem Betriebsverfahren zusätzlich zu den eingangs genannten Maßnahmen folgende Maßnahmen ergriffen:

  • Der Elongationsregler ermittelt anhand der ihm zugeführten Werte, also anhand des Elongationsistwerts und des Elongationssollwerts, einen Zugsollwert.
  • Ein Zugistwert wird erfasst.
  • Der Zugsollwert wird auf einen maximalen Zugsollwert begrenzt.
  • Der Zugistwert und der auf den maximalen Zugsollwert begrenzte Zugsollwert werden einem Zugregler zugeführt, der anhand der ihm zugeführten Werte, also anhand des Zugistwerts und des begrenzten Zugsollwerts, einen Geschwindigkeitszusatzsollwert ermittelt.
  • Der Geschwindigkeitszusatzsollwert wird auf den ausgangsseitigen Geschwindigkeitssollwert aufgeschaltet.
According to the invention, the following measures are taken in the operating method in addition to the measures mentioned above:
  • The elongation controller determines a tension setpoint on the basis of the values supplied to it, that is to say on the basis of the elongation actual value and the elongation setpoint.
  • An actual train value is recorded.
  • The tension setpoint is limited to a maximum tension setpoint.
  • The actual train value and the train setpoint limited to the maximum train setpoint are fed to a train controller, which determines a supplementary speed setpoint on the basis of the values supplied to it, that is to say based on the actual train value and the limited train setpoint.
  • The additional speed setpoint is switched to the output speed setpoint.

Der Elongationsregler und der Zugregler können nach Bedarf ausgebildet sein. Bevorzugt ist derzeit, dass der Elongationsregler als PI-Regler ausgebildet ist und dass der Zugregler als P-Regler oder als PI-Regler ausgebildet ist.The elongation controller and the draft regulator can be designed as required. It is currently preferred that the elongation controller is designed as a PI controller and that the tension controller is designed as a P controller or as a PI controller.

In einer weiter bevorzugten Ausgestaltung der vorliegenden Erfindung ist vorgesehen, dass der ausgangsseitige Geschwindigkeitssollwert durch Multiplizieren des eingangsseitigen Geschwindigkeitssollwerts mit dem Elongationssollwert ermittelt wird.In a further preferred embodiment of the present invention it is provided that the output-side speed setpoint by multiplying the input side Velocity setpoint is determined with the elongation setpoint.

Die Aufgabe wird weiterhin durch ein Computerprogramm mit den Merkmalen des Anspruchs 5 gelöst. Erfindungsgemäß bewirkt die Abarbeitung der Maschinenbefehle durch die Steuereinrichtung, dass die Steuereinrichtung den Streckrichter gemäß einem erfindungsgemäßen Betriebsverfahren betreibt.The object is further achieved by a computer program having the features of claim 5. According to the invention, the execution of the machine commands by the control device causes the control device to operate the stretcher according to an operating method according to the invention.

Das Computerprogramm kann auf einem mobilen Datenträger gespeichert sein. Alternativ kann es in der Steuereinrichtung gespeichert sein.The computer program can be stored on a mobile data carrier. Alternatively, it may be stored in the controller.

Weiterhin wird die Aufgabe durch eine Steuereinrichtung mit den Merkmalen des Anspruchs 8 gelöst. Erfindungsgemäß ist die Steuereinrichtung also derart ausgebildet, dass sie mindestens einen Betriebsmode aufweist, in dem sie den Streckrichter gemäß einem erfindungsgemäßen Betriebsverfahren betreibt.Furthermore, the object is achieved by a control device having the features of claim 8. According to the invention, the control device is thus designed such that it has at least one operating mode in which it operates the stretcher according to an operating method according to the invention.

Schließlich wird die Aufgabe durch einen Streckrichter mit den Merkmalen des Anspruchs 12 gelöst. Erfindungsgemäß weist der Streckrichter eine erfindungsgemäß ausgebildete Steuereinrichtung auf.Finally, the object is achieved by a stretcher with the features of claim 12. According to the invention, the stretcher has a control device designed according to the invention.

Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen in Verbindung mit den Zeichnungen. Es zeigen in Prinzipdarstellung:

FIG 1
einen Streckrichter nebst zugehöriger Steuereinrichtung und
FIG 2
eine mögliche Ausgestaltung der Steuereinrichtung des Streckrichters von FIG 1.
Further advantages and details will become apparent from the following description of exemplary embodiments in conjunction with the drawings. In a schematic representation:
FIG. 1
a stretch leveler together with associated control device and
FIG. 2
a possible embodiment of the control device of the drafting of FIG. 1 ,

Gemäß FIG 1 umfasst ein Streckrichter ein eingangsseitiges Förderelement 1, ein Biegeelement 2, und ein ausgangsseitiges Förderelement 3. Das eingangsseitige Förderelement 1 und das ausgangsseitige Förderelement 3, gegebenenfalls auch das Biegeelement 2, werden von einer Steuereinrichtung 4 gesteuert.According to FIG. 1 a stretch leveler comprises an input-side conveyor element 1, a bending element 2, and an output-side conveyor element 3. The input-side conveyor element 1 and the output-side conveyor element 3, optionally also the bending element 2, are controlled by a control device 4.

Das eingangsseitige Förderelement 1 ist in der Regel als S-Rollensatz ausgebildet. Es kann zwei oder mehr als zwei Rollen 5a bis 5d aufweisen. Dargestellt ist in FIG 1 eine Ausgestaltung des eingangsseitigen Förderelements 1 mit vier Rollen 5a bis 5d. Diese Ausgestaltung ist im Rahmen der vorliegenden Erfindung üblich, aber nicht zwingend.The input-side conveyor element 1 is usually designed as an S-roller set. It may have two or more than two rollers 5a to 5d. Is shown in FIG. 1 an embodiment of the input-side conveyor element 1 with four rollers 5a to 5d. This embodiment is common in the context of the present invention, but not mandatory.

Die Rollen 5a bis 5d des eingangsseitigen Förderelements 1 sind zumindest teilweise angetrieben. Insbesondere die Rolle 5d, das heißt die dem Biegeelement 2 unmittelbar vorgeordnete Rolle 5d, ist angetrieben.The rollers 5a to 5d of the input-side conveyor element 1 are at least partially driven. In particular, the roller 5d, that is, the bending member 2 immediately upstream roller 5d, is driven.

Das eingangsseitige Förderelement 1 führt dem Biegeelement 2 ein Band 6 zu. Das Band 6 ist in der Regel ein Metallband 6, beispielsweise ein Stahl-, Aluminium- oder Kupferband. In manchen Fällen kann das Band 6 auch als Textilband ausgebildet sein.The input-side conveyor element 1 leads to the bending element 2 a band 6. The band 6 is usually a metal band 6, for example a steel, aluminum or copper band. In some cases, the band 6 may also be formed as a textile band.

Das Zuführen des Bandes 6 zum Biegeelement 2 erfolgt mit einer Eingangsgeschwindigkeit v1. Zu diesem Zweck ist ein eingangsseitiger Geschwindigkeitsregler 7 vorhanden, dem die Eingangsgeschwindigkeit v1 und ein eingangsseitiger Geschwindigkeitssollwert v1* zugeführt werden. Der eingangsseitige Geschwindigkeitsregler 7 bewirkt, dass das eingangsseitige Förderelement 1 auf den eingangsseitigen Geschwindigkeitssollwert v1 geregelt wird. Er gibt zu diesem Zweck ein geeignetes Stellsignal S1 an das eingangsseitige Förderelement 1 aus. Beispielsweise kann er einen Antrieb der Rolle 5d entsprechend ansteuern.The feeding of the belt 6 to the bending element 2 takes place with an input speed v1. For this purpose, an input-side speed controller 7 is provided to which the input speed v1 and an input-side speed setpoint v1 * are supplied. The input-side speed controller 7 causes the input-side conveyor element 1 is controlled to the input-side speed setpoint v1. It outputs for this purpose a suitable control signal S1 to the input-side conveyor element 1. For example, it can control a drive of the roller 5d accordingly.

Auch das ausgangsseitige Förderelement 3 ist in der Regel als S-Rollensatz ausgebildet. Analog zum eingangsseitigen Förderelement 1 kann der S-Rollensatz zwei oder mehr als zwei Rollen 8a bis 8d aufweisen. Dargestellt sind in FIG 1 vier Rollen 8a bis 8d. Diese Ausgestaltung ist im Rahmen der vorliegenden Erfindung üblich, aber nicht zwingend.The output-side conveyor element 3 is usually designed as an S-roller set. Analogously to the input-side conveying element 1, the S-roller set may have two or more than two rollers 8a to 8d. Shown in FIG. 1 four rollers 8a to 8d. This embodiment is common in the context of the present invention, but not mandatory.

Die Rollen 8a bis 8d des ausgangsseitigen Förderelements 3 sind zumindest teilweise angetrieben. Insbesondere die innerste Rolle 8a, das heißt die dem Biegeelement 2 unmittelbar nachgeordnete Rolle 8a, ist angetrieben.The rollers 8a to 8d of the output-side conveyor element 3 are at least partially driven. In particular, the innermost roller 8a, that is, the bending element 2 immediately downstream roller 8a, is driven.

Mittels des ausgangsseitigen Förderelements 3 wird das Band 6 aus dem Biegeelement 2 abgeführt. Das Abführen erfolgt mit einer Ausgangsgeschwindigkeit v2. Zu diesem Zweck ist ein ausgangsseitiger Geschwindigkeitsregler 9 vorhanden, dem die Ausgangsgeschwindigkeit v2 und ein ausgangsseitiger Geschwindigkeitssollwert v2* zugeführt werden. Der ausgangsseitige Geschwindigkeitsregler 9 bewirkt, dass das ausgangsseitige Förderelement 3 auf den ausgangsseitigen Geschwindigkeitssollwert v2* geregelt wird. Er gibt zu diesem Zweck ein geeignetes Stellsignal S2 an das ausgangsseitige Förderelement 3 aus. Beispielsweise kann er einen Antrieb der Rolle 8a entsprechend ansteuern.By means of the output-side conveyor element 3, the band 6 is removed from the bending element 2. The removal takes place with an initial speed v2. For this purpose, an output-side speed controller 9 is provided to which the output speed v2 and an output-side speed setpoint v2 * are supplied. The output-side speed controller 9 causes the output-side conveyor element 3 to the output-side speed setpoint v2 * is regulated. It outputs for this purpose a suitable actuating signal S2 to the output-side conveyor element 3. For example, it can drive a drive of the roller 8a accordingly.

Auch das Biegeelement 2 weist eine Anzahl von Rollen 10 auf. Dargestellt sind in FIG 1 fünf derartige Rollen 10. Die Anzahl an Rollen 10 des Biegeelements 2 könnte jedoch alternativ größer oder kleiner als fünf sein. Die Rollen 10 sind in der Regel nicht angetrieben. Sie könnten jedoch angetrieben sein. Die Rollen 10 des Biegeelements 2 sind an das Band 6 angestellt. Mittels der Rollen 10 wird das Band 6 im Biegeelement 2 alternierend nach oben und unten ausgelenkt.Also, the bending element 2 has a number of rollers 10. Shown in FIG. 1 however, the number of rollers 10 of the flexure 2 could alternatively be greater or less than five. The rollers 10 are not driven in the rule. They could, however, be powered. The rollers 10 of the bending element 2 are employed on the belt 6. By means of the rollers 10, the band 6 is deflected in the bending element 2 alternately up and down.

Der Streckrichter ist in der Regel unter anderem in einem Zugregelmode betreibbar. Im Zugregelmode ist der ausgangsseitige Geschwindigkeitssollwert v2* gleich dem eingangsseitigen Geschwindigkeitssollwert v1*. Mittels eines Zugerfassungselements 11 wird ein Zugistwert Z erfasst, der im Band 6 zwischen den Förderelementen 1, 3 herrscht. Der Zugistwert Z wird auf einen Zugsollwert Z* geregelt.The stretcher is usually operated, inter alia, in a Zugregelmode. In the train control mode, the output-side speed setpoint v2 * is equal to the input-side speed setpoint v1 *. By means of a tension detection element 11, an actual tension value Z is detected, which prevails in the belt 6 between the conveying elements 1, 3. The actual train value Z is regulated to a train setpoint Z *.

Der Zugregelmode kann auch im Rahmen der vorliegenden Erfindung möglich sein. Dies ist jedoch nicht von Bedeutung. Entscheidend ist, dass der Streckrichter (zumindest unter anderem) in einem Elongationsregelmode betreibbar ist. Der Elongationsregelmode wird nachstehend näher erläutert.The Zugregelmode may also be possible in the context of the present invention. This is not important. It is crucial that the stretcher be operated (at least among others) in a Elongationsregelmode. The elongation control mode will be explained in more detail below.

Im Elongationsregelmode ist der ausgangsseitige Geschwindigkeitssollwert v2* größer als der eingangsseitige Geschwindigkeitssollwert v1*. Hiermit korrespondierend ist auch die Ausgangsgeschwindigkeit v2 größer als die Eingangsgeschwindigkeit v1. Der Geschwindigkeitsunterschied zwischen der Ausgangsgeschwindigkeit v2 und der Eingangsgeschwindigkeit v1 ist hierbei derart, dass das Band 6 zwischen den Förderelementen 1, 3 plastisch gestreckt wird.In the elongation control mode, the output-side speed setpoint v2 * is greater than the input-side speed setpoint v1 *. Correspondingly, the output speed v2 is also greater than the input speed v1. The speed difference between the output speed v2 and the input speed v1 is in this case such that the belt 6 is plastically stretched between the conveyor elements 1, 3.

Wie bereits erwähnt, werden die Eingangsgeschwindigkeit v1 und die Ausgangsgeschwindigkeit v2 erfasst. Die Erfassung erfolgt mittels entsprechender Geschwindigkeitserfassungselemente 12, 13. In der Regel werden die Geschwindigkeiten v1, v2 der äußeren Rollen 5a, 8d erfasst. Die erfassten Geschwindigkeiten v1, v2 werden jedoch nicht nur den Geschwindigkeitsreglern 7, 9 zugeführt, sondern auch einem Elongationsermittler 14, der anhand der Eingangsgeschwindigkeit v1 und der Ausgangsgeschwindigkeit v2 einen Elongationsistwert e für das Band 6 ermittelt.As already mentioned, the input speed v1 and the output speed v2 are detected. The detection takes place by means of corresponding speed detection elements 12, 13. As a rule, the speeds v1, v2 of the outer rollers 5a, 8d are detected. However, the detected velocities v1, v2 are supplied not only to the speed controllers 7, 9, but also to an elongation detector 14 which determines an elongation actual value e for the band 6 on the basis of the input speed v1 and the initial speed v2.

Der Elongationsistwert e und ein Elongationssollwert e* (mit e* > 1) werden einem Elongationsregler 15 zugeführt. Der Elongationsregler 15 ermittelt anhand der ihm zugeführten Werte e, e* einen Zugsollwert Z*.The elongation actual value e and an elongation setpoint e * (with e *> 1) are fed to an elongation controller 15. The elongation controller 15 determines a train setpoint Z * based on the values e, e * supplied to it.

Der Elongationsregler 15 kann beliebig ausgebildet sein, beispielsweise als P-Regler, als PI-Regler, als PID-Regler, als PT1-Regler oder als PT2-Regler. Üblicherweise ist der Elongationsregler 15 als PI-Regler ausgebildet.The elongation controller 15 can be of any desired design, for example as a P controller, as a PI controller, as a PID controller, as a PT1 controller or as a PT2 controller. Usually, the elongation controller 15 is designed as a PI controller.

Der Zugsollwert Z* wird einem Zugregler 16 zugeführt. Zwischen dem Elongationsregler 15 und dem Zugregler 16 ist jedoch ein Begrenzungselement 17 angeordnet. Das Begrenzungselement 17 begrenzt den Zugsollwert Z* auf einen maximalen Zugsollwert ZMAX*. Der maximale Zugsollwert ZMAX* ist derart bestimmt, dass er oberhalb der Streckgrenze des Bandes 6 liegt, aber unterhalb eines Wertes, ab dem - insbesondere in Lagern der Rollen 10 des Biegeelements 2 - übermäßiger Verschleiß auftritt. Dem Zugregler 16 wird daher zugeführt

  • der Zugsollwert Z*, wenn der Zugsollwert Z* kleiner als der maximale Zugsollwert ZMAX* ist, und
  • anderenfalls der maximale Zugsollwert ZMAX*.
The train setpoint Z * is fed to a tension controller 16. Between the elongation controller 15 and the tension regulator 16, however, a limiting element 17 is arranged. The limiting element 17 limits the train setpoint Z * to a maximum train setpoint ZMAX *. The maximum tension set value ZMAX * is determined such that it lies above the yield strength of the belt 6, but below a value above which excessive wear occurs, in particular in bearings of the rollers 10 of the bending element 2. The tension regulator 16 is therefore supplied
  • the train setpoint Z *, if the train setpoint Z * is less than the maximum train setpoint ZMAX *, and
  • otherwise the maximum tension setpoint ZMAX *.

Dem Zugregler 16 wird weiterhin der Zugistwert Z zugeführt. Der Zugistwert Z kann hierbei mittels des Zugerfassungselements 11 oder anderweitig mittels eines anderen, nicht dargestellten Zugerfassungselements erfasst werden.The tension controller 16 is further supplied with the Zugistwert Z. The Zugistwert Z can in this case by means of the Zugerfassungselements 11 or otherwise detected by means of another, not shown train detection element.

Der Zugregler 16 ermittelt anhand der ihm zugeführten Werte Z und Z* bzw. Z und ZMAX* einen Geschwindigkeitszusatzsollwert δv*. Der Zugregler 16 kann zu diesem Zweck beliebig ausgebildet sein. Die obigen Ausführungen zur Ausbildung des Elongationsreglers 15 sind analog anwendbar. Üblicherweise ist der Zugregler 16 entweder als P-Regler oder als PI-Regler ausgebildet. Beide Ausgestaltungen sind in FIG 1 dargestellt. Da beide Ausgestaltungen jedoch alternativ zueinander stehen, sind beide Ausgestaltungen in FIG 1 nur gestrichelt dargestellt.The tension controller 16 determines a speed addition setpoint δv * based on the values Z and Z * or Z and ZMAX * supplied to it. The tension regulator 16 can be designed as desired for this purpose. The above statements on the design of the elongation controller 15 are analogously applicable. Usually, the tension controller 16 is designed either as a P controller or as a PI controller. Both embodiments are in FIG. 1 shown. However, since both embodiments are alternative to each other, both embodiments are in FIG. 1 shown only by dashed lines.

Der Geschwindigkeitszusatzsollwert δv* wird einem Aufschaltelement 18 zugeführt. Dem Aufschaltelement 18 wird weiterhin der ausgangsseitige Geschwindigkeitssollwert v2* zugeführt. Das Aufschaltelement 18 schaltet den Geschwindigkeitszusatzsollwert δv* auf den ausgangsseitigen Geschwindigkeitssollwert v2* auf.The additional speed setpoint value δv * is fed to a connection element 18. The Aufschaltelement 18 is further supplied to the output side speed setpoint v2 *. The connection element 18 switches on the additional speed setpoint value δv * to the output speed setpoint value v2 *.

Der ausgangsseitige Geschwindigkeitssollwert v2* kann prinzipiell auf beliebige Weise ermittelt werden. Insbesondere kann der ausgangsseitige Geschwindigkeitssollwert v2* zunächst gleich dem eingangsseitigen Geschwindigkeitssollwert v1* gesetzt werden oder sich vom eingangsseitigen Geschwindigkeitssollwert v1* um einen festen Wert unterscheiden. Vorzugsweise jedoch werden der eingangsseitige Geschwindigkeitssollwert v1* und der Elongationssollwert e* einem Multiplizierer 19 zugeführt. Der Multiplizierer 19 ermittelt durch Multiplizieren des eingangsseitigen Geschwindigkeitssollwerts v1* mit dem Elongationssollwert e* den ausgangsseitigen Geschwindigkeitssollwert v2*.The output speed setpoint v2 * can in principle be determined in any way. In particular, the output-side speed setpoint v2 * may first be set equal to the input-side speed setpoint v1 * or may differ from the input-side speed setpoint v1 * by a fixed value. Preferably, however, the input-side speed command value v1 * and the elongation command value e * are supplied to a multiplier 19. The multiplier 19 determines the output-side speed command value v2 * by multiplying the input-side speed command value v1 * by the elongation command value e *.

Es ist möglich, dass die Steuereinrichtung 4 entsprechend der Darstellung in FIG 1 in Hardware aufgebaut ist. Oftmals jedoch ist die Steuereinrichtung 4 entsprechend der Darstellung von FIG 2 als softwareprogrammierbare Steuereinrichtung ausgebildet. In diesem Fall weist die Steuereinrichtung 4 einen Prozessor 20 auf, der ein Computerprogramm 21 abarbeitet. Das Computerprogramm 21 bestimmt in diesem Fall die Wirkungsweise der Steuereinrichtung 4.It is possible that the control device 4 as shown in FIG FIG. 1 is built in hardware. Often, however, the control device 4 according to the representation of FIG. 2 designed as a software programmable controller. In this case, the control device 4 has a processor 20, which executes a computer program 21. The computer program 21 in this case determines the mode of action of the control device 4.

Das Computerprogramm 21 umfasst gemäß FIG 2 Maschinenbefehle 22, die von der Steuereinrichtung 4 (genauer: vom Prozessor 20 der Steuereinrichtung 4) unmittelbar abarbeitbar sind. Die Abarbeitung der Maschinenbefehle 22 durch die Steuereinrichtung 4 bewirkt, dass die Steuereinrichtung 4 den Streckrichter so betreibt, wie dies obenstehend in Verbindung mit FIG 1 erläutert wurde.The computer program 21 comprises according to FIG. 2 Machine commands 22, which are directly abarbeitbar by the control device 4 (more precisely: by the processor 20 of the control device 4). The execution of the machine commands 22 by the control device 4 causes the control device 4 to operate the stretcher as described above in connection with FIG FIG. 1 was explained.

Zum Zeitpunkt des Abarbeitens der Maschinenbefehle 22 muss das Computerprogramm 21 in einem internen Speicher 23 der Steuereinrichtung 4 hinterlegt sein. Zu diesem Zeitpunkt ist das Computerprogramm 21 also in der Steuereinrichtung 4 gespeichert. Das Zuführen des Computerprogramms 21 zur Steuereinrichtung 4 kann jedoch auf verschiedene Weise erfolgen.At the time of execution of the machine commands 22, the computer program 21 must be stored in an internal memory 23 of the control device 4. At this time, the computer program 21 is thus stored in the control device 4. However, the feeding of the computer program 21 to the control device 4 can take place in various ways.

So ist es beispielsweise möglich, das Computerprogramm 21 vorab in dem internen Speicher 23 zu speichern und den internen Speicher 23 erst danach, also nach dem Abspeichern des Computerprogramms 21 im internen Speicher 23, in die Steuereinrichtung 4 einzusetzen. Alternativ ist es möglich, das Computerprogramm 21 auf einem mobilen Datenträger 24 zu speichern. In diesem Fall muss die Steuereinrichtung 4 eine entsprechende Schnittstelle für den mobilen Datenträger 24 aufweisen. Der mobile Datenträger 24 kann nach Bedarf ausgebildet sein. Beispielsweise kann er als CD-ROM, als SD-Speicherkarte oder entsprechend der Darstellung in FIG 2 als USB-Memorystick ausgebildet sein.Thus, for example, it is possible to store the computer program 21 in advance in the internal memory 23 and to insert the internal memory 23 into the control device 4 only after that, ie after the computer program 21 has been stored in the internal memory 23. Alternatively, it is possible to save the computer program 21 on a mobile data carrier 24. In this case, the control device 4 must have a corresponding interface for the mobile data carrier 24. The mobile data carrier 24 can be designed as needed. For example, it can be used as a CD-ROM, as an SD memory card or as shown in FIG. 2 be designed as a USB memory stick.

Wiederum alternativ ist es möglich, das Computerprogramm 21 der Steuereinrichtung 4 über eine Rechner-Rechner-Verbindung 25 zuzuführen. In diesem Fall muss die Steuereinrichtung 4 über eine entsprechende Schnittstelle zur Rechner-Rechner-Verbindung 25 verfügen. Die Rechner-Rechner-Verbindung 25 kann beispielsweise ein LAN oder ein größeres Rechnernetz sein, insbesondere das World Wide Web.Again, alternatively, it is possible to supply the computer program 21 of the control device 4 via a computer-computer connection 25. In this case, the control device 4 must have a corresponding interface to the computer-computer connection 25. The computer-computer connection 25 may for example be a LAN or a larger computer network, in particular the World Wide Web.

Die vorliegende Erfindung weist viele Vorteile auf. So kann insbesondere ein stabiles, schwingungsfreies Verhalten des Streckrichters erreicht werden. Auch können die starken Abweichungen zwischen Elongationssollwert e* und Elongationsistwert e, die im Stand der Technik auftreten, deutlich reduziert werden. Bei Versuchen konnten die Abweichungen auf ca. 20 % der vorherigen Abweichung reduziert werden. Auch folgt der Elongationsistwert e bei einer Änderung des Elongationssollwerts e* schnell und ohne nennenswertes Überschwingen dem Elongationssollwert e*. Der Streckrichter läuft stabiler. Im Ergebnis ist somit eine deutliche Produktions- und Qualitätsverbesserung erreichbar.The present invention has many advantages. In particular, a stable, vibration-free behavior of the stretch leveler can be achieved. Also, the strong deviations between elongation setpoint e * and elongation actual value e, which occur in the prior art, can be significantly reduced. In tests, the deviations could be reduced to approx. 20% of the previous deviation. The elongation actual value e also follows the elongation setpoint e * quickly and without appreciable overshoot when the elongation setpoint e * changes. The stretch leveler runs more stable. As a result, a significant production and quality improvement can be achieved.

Die obige Beschreibung dient ausschließlich der Erläuterung der vorliegenden Erfindung. Der Schutzumfang der vorliegenden Erfindung soll hingegen ausschließlich durch die beigefügten Ansprüche bestimmt sein.The above description is only for explanation of the present invention. The scope of the present invention, however, is intended to be determined solely by the appended claims.

Claims (12)

  1. Operating method for a stretch leveller which comprises an input-side feed element (1), a bending element (2) and an output-side feed element (3),
    - wherein a strip (6), in particular a metal strip (6), is fed to the bending element (2) by the input-side feed element (1) with an input speed (v1),
    - wherein the strip (6) is discharged from the bending element (2) by the output-side feed element (3) with an output speed (v2),
    - wherein the output speed (v2) is higher than the input speed (v1), with the result that the strip (6) is plastically stretched,
    - wherein the strip (6) is deflected alternately upwards and downwards in the bending element (2) by means of rollers (10), positioned against the strip (6), of the bending element (2),
    - wherein the input-side feed element (1) is adjusted to an input-side speed desired value (v1*) and the output-side feed element (3) is adjusted to an output-side speed desired value (v2*),
    - wherein the input speed (v1) and the output speed (v2) are sensed and an elongation actual value (e) for the strip (6) is determined from them,
    - wherein the elongation actual value (e) and an elongation desired value (e*) are fed to an elongation controller (15),
    characterized
    - in that the elongation controller (15) determines a tension desired value (Z*) on the basis of the values (e, e*) fed to said elongation controller (15),
    - in that the tension desired value (Z*) is limited to a maximum tension desired value (ZMAX*),
    - in that a tension actual value (Z) is sensed,
    - in that the tension actual value (Z) and the tension desired value (Z*) which is limited to the maximum tension desired value (ZMAX*) are fed to a tension controller (16) which determines a speed additional desired value (δv*) on the basis of the values (Z, Z*) which are fed to said tension controller (16), and
    - in that the speed additional desired value (δv*) is applied to the output-side speed desired value (v2*).
  2. Operating method according to Claim 1,
    characterized in that the elongation controller (15) is embodied as a PI controller.
  3. Operating method according to Claim 1 or 2,
    characterized in that the tension controller (16) is embodied as a P controller or as a PI controller.
  4. Operating method according to Claim 1, 2 or 3,
    characterized in that the output-side speed desired value (v2*) is determined by multiplying the input-side speed desired value (v1*) by the elongation desired value (e*).
  5. Computer program for a control device (4) of a stretch leveller, wherein the computer program comprises machine instructions (22) which can be processed directly by the control device (4), wherein the processing of the machine instructions (22) by the control device (4) causes the control device (4) to operate the stretch leveller in accordance with an operating method according to one of the above claims.
  6. Computer program according to Claim 5,
    characterized in that said computer program is stored on a mobile data carrier (24).
  7. Computer program according to Claim 5,
    characterized in that said computer program is stored in the control device (4).
  8. Control device for a stretch leveller which comprises an input-side feed element (1), a bending element (2) and an output-side feed element (3),
    - wherein the control device has an input-side speed controller (7), an output-side speed controller (9), an elongation-determining device (14), an elongation controller (15), a tension controller (16), a limiting element (17) and an application element (18),
    - wherein the control device has at least one operating mode in which the specified elements (7, 9, 14, 15, 16, 17, 18) of the control device interact as follows:
    - an input speed value (v1), with which a strip (6), in particular a metal strip (6), is fed to the bending element (2) by the input-side feed element (1), is fed to the input-side speed controller (7);
    - the input-side speed controller (7) outputs to the input-side feed element (1) an input-side actuation signal (S1) by means of which the input-side feed element (1) is adjusted to an input-side speed desired value (v1*);
    - an output speed value (v2), with which the strip (6) is discharged from the bending element (2) by the output-side feed element (3), is fed to the output-side speed controller (9),
    - the output-side speed controller (9) outputs to the output-side feed element (3) an output-side actuation signal (S2) by means of which the output-side feed element (1) is adjusted to an output-side speed desired value (v2*),
    - the input speed value (v1) and the output speed value (v2) are fed to the elongation-determining device (14);
    - the elongation-determining device (14) determines an elongation actual value (e) for the strip (6) from the values (v1, v2) which are fed to said elongation-determining device (14);
    - the elongation actual value (e) and an elongation desired value (e*) are fed to the elongation controller (15);
    - the elongation controller (15) determines a tension desired value (Z*) on the basis of the values (e, e*) which are fed to said elongation controller (15);
    - the limiting element (17) is arranged downstream of the elongation controller (15) and limits the tension desired value (Z*) to a maximum tension desired value (ZMAX*);
    - a sensed tension actual value (Z) and the tension desired value (Z*) which is limited to the maximum tension desired value (ZMAX*) are fed to the tension controller (16);
    - the tension controller (16) determines a speed additional desired value (δv*) on the basis of the values (Z, Z*) which are fed to said tension controller (16);
    - the speed additional desired value (δv*) and the output-side speed desired value (v2*) are fed to the application element (18); and
    - the application element (18) applies the speed additional desired value (δv*) to the output-side speed desired value (v2*).
  9. Control device according to Claim 8,
    characterized in that the elongation controller (15) is embodied as a PI controller.
  10. Control device according to Claim 8 or 9,
    characterized in that the tension controller (16) is embodied as a P controller or as a PI controller.
  11. Control device according to Claim 8, 9 or 10, characterized in that the control device has a multiplier (19) to which the input-side speed desired value (v1*) and the elongation desired value (e*) are fed and which determines, in the at least one operating mode, the output-side speed desired value (v2*) by multiplying the input-side speed desired value (v1*) by the elongation desired value (e*).
  12. Stretch leveller for a strip (6), in particular a metal strip (6),
    - wherein the stretch leveller comprises an input-side feed element (1), a bending element (2) and an output-side feed element (3),
    - wherein the strip (6) can be fed to the bending element (2) by the input-side feed element (1),
    - wherein the strip (6) can be discharged from the bending element (2) by the output-side feed element (3),
    - wherein the strip (6) can be deflected alternately upwards and downwards in the bending element (2) by means of rollers (10), which are positioned against the strip (6), of the bending element (2),
    - wherein the stretch leveller has a control device (4) according to one of Claims 8 to 11.
EP09779474.7A 2008-09-01 2009-05-14 Operating method for a stretch leveler with superimposed elongation control and subordinate tension control Active EP2328697B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09779474T PL2328697T3 (en) 2008-09-01 2009-05-14 Operating method for a stretch leveler with superimposed elongation control and subordinate tension control

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008045340A DE102008045340A1 (en) 2008-09-01 2008-09-01 Operating method for a drafting jig with superimposed elongation control and subordinate tension control
PCT/EP2009/055820 WO2010022992A1 (en) 2008-09-01 2009-05-14 Operating method for a stretch leveler with superimposed elongation control and subordinate tension control

Publications (3)

Publication Number Publication Date
EP2328697A1 EP2328697A1 (en) 2011-06-08
EP2328697B1 true EP2328697B1 (en) 2013-01-30
EP2328697B2 EP2328697B2 (en) 2019-10-09

Family

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CN (1) CN102137725B (en)
DE (1) DE102008045340A1 (en)
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WO2013035449A1 (en) * 2011-09-07 2013-03-14 スチールプランテック株式会社 Roller leveler and metal plate leveling method using same
WO2014017944A1 (en) * 2012-07-27 2014-01-30 Totsky Ivan Timofeevich Method for the cold deformation of a continuous metal strip
DE102018111627A1 (en) * 2018-01-23 2019-07-25 Klaus Lenz Stretch-bending straightening system and method for its operation

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JPS5581009A (en) * 1978-12-14 1980-06-18 Nippon Steel Corp Skin-pass rolling shape control method of cold rolled hoop after continuous annealing and equipment thereof
DE2911983C2 (en) * 1979-03-27 1986-03-20 Mannesmann AG, 4000 Düsseldorf Device for regulating systems for stretch-bending and straightening continuously passing strips
JPH0237803B2 (en) † 1984-08-18 1990-08-27 Yaskawa Denki Seisakusho Kk TENSHONREBERA
DE3525343C1 (en) * 1985-04-20 1986-12-11 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg Method and apparatus for the continuous levelling of metal strips
GB2174027B (en) * 1985-04-20 1988-07-13 Bwg Bergwerk Walzwerk Process and equipment for continuous flattening of particularly thin metal strip
JP2518370B2 (en) † 1988-12-28 1996-07-24 株式会社安川電機 Tension leveler control method
JPH0768319A (en) * 1993-06-29 1995-03-14 Kawasaki Steel Corp Method for controlling tension leveler
DE19520541C2 (en) * 1995-06-03 1999-01-14 Bwg Bergwerk Walzwerk Method and device for correcting a rolled metal strip which is bent horizontally in the strip plane, in particular a metal strip with a strip thickness of 0.5 mm to 2.0 mm
JPH11347630A (en) 1998-06-03 1999-12-21 Yodogawa Steel Works Ltd Actual result of elongation percentage calculating method and elongation percentage control method of metal plate in tension leveler
JP4333162B2 (en) † 2003-02-27 2009-09-16 Ｊｆｅスチール株式会社 Elongation rate control method by tension leveler
DE10342798B3 (en) 2003-09-16 2005-03-10 Siemens Ag Process to maintain tension of moving metal web through succession of treatment stations defined by sets of rollers
DE102004048658A1 (en) * 2004-10-06 2006-04-20 Sms Demag Ag Apparatus for continuous drawing of a metal strip and method for operating such a device
CN201464909U (en) * 2009-08-11 2010-05-12 天津赛瑞机器设备有限公司 Core rod pressure flattening machine control system based on PLC

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PL2328697T3 (en) 2013-07-31
CN102137725B (en) 2013-09-11
DE102008045340A1 (en) 2010-03-04
CN102137725A (en) 2011-07-27
EP2328697B2 (en) 2019-10-09
EP2328697A1 (en) 2011-06-08
WO2010022992A1 (en) 2010-03-04

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