EP1121990A2 - Device for rolling strips with a periodically variable thickness - Google Patents

Device for rolling strips with a periodically variable thickness Download PDF

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Publication number
EP1121990A2
EP1121990A2 EP01102289A EP01102289A EP1121990A2 EP 1121990 A2 EP1121990 A2 EP 1121990A2 EP 01102289 A EP01102289 A EP 01102289A EP 01102289 A EP01102289 A EP 01102289A EP 1121990 A2 EP1121990 A2 EP 1121990A2
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EP
European Patent Office
Prior art keywords
strip
roll
thickness
reel
roll gap
Prior art date
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Granted
Application number
EP01102289A
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German (de)
French (fr)
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EP1121990B1 (en
EP1121990A3 (en
EP1121990B2 (en
Inventor
Jürgen Dr.-Ing. Klöckner
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Josef Frohling GmbH
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Josef Frohling GmbH
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Classifications

    • 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
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
    • 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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • 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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • 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
    • B21B37/52—Tension control; Compression control by drive motor control
    • B21B37/54—Tension control; Compression control by drive motor control including coiler drive control, e.g. reversing mills
    • 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 present invention relates to the rolling of strips, by means of a roll stand with a set of rollers for limitation of the roll gap and an adjustment system for determination the width of the roll gap.
  • a decoiler Located in front of the rolling stand there is a decoiler, a decoiler is the roll stand subordinate.
  • the strip material to be reduced in thickness is unwound from the decoiler under tension, passed through the nip between the rolls of the roll set and again under tension on the take-up reel wound up.
  • the aim is to be as uniform as possible Thickness of the strip-like rolling stock after leaving the Roll gap, as is naturally the case on the decoiler strip-shaped starting rolling stock in the form of a coil the same possible thickness over the entire length Length.
  • strip-shaped rolling stock has a starting thickness that is as constant as possible and have a constant, smaller final thickness as possible. Should, for example in body construction, sheet metal in various Areas have different thicknesses, so are metal strips different thicknesses welded together.
  • Sheet metal strips have already been rolled in the laboratory Longitudinal direction of the belt successive belt sections of different thicknesses. One-off sections follow different sections Thicknesses on each other, it can be relatively easy by changing the width of the roll gap.
  • stripe sections should be different Thicknesses follow one another, so only a relatively small one Belt speed a smooth transition between the individual band sections of different thicknesses guaranteed become.
  • the possible tape running speed is too low to the laboratory operation in the area of industrial mass production to take over.
  • the problems with the production of tapes periodically consecutive band sections different Strip thicknesses are due to the fact that when changing the degree of rolling, the belt speeds on Change the entrance and exit of the roll gap and advance and backing up the tape relative to the peripheral speed of the Change work rolls with the stitch change. That’s why the speed of the reel drives is constantly changing Process conditions are adjusted. For this are speed changes up to 50% of the nominal speed in short time (e.g. 0.15 seconds) is required. This leads to the previously known cold rolling mills for violent fluctuations in strip tension. This results in an irregular structure of what is to be wound up Coils, impermissible deviations in the final roll thickness of their setpoint, risk of belt breaks and damage to system parts.
  • a rolling mill becomes more relevant State of the art provided that there is a decoiler on the inlet side in front of a roll stand and preferably also pulleys, Has tape tension measuring devices and tape thickness measuring devices as well a reel on the outlet side according to the roll stand mentioned and preferably again deflection rollers, tape tension measuring devices and has tape thickness gauges. It is marked Invention above all through a balancing or dancer role on the inlet side and another dancer roll on the outlet side.
  • the roll stand (main drive) is speed-controlled on the desired speed set. In stationary Rolling operation, the rollers rotate with practically constant Peripheral speed.
  • the dancer roles are force-controlled with the task, the desired one Apply tape tension.
  • the reel is speed controlled, with the target speed taking into account the respective coil diameter the average of the belt speed is set.
  • the positions of the dancer rolls are monitored and control signals for correcting the reel speeds are derived, for example as follows: If the dancer roll on the inlet side drops too low below the lower switching point, the uncoiling is delayed accordingly. If this dancer roll rises too far above the upper switching point, the uncoiling is accelerated. If the dancer roll on the outlet side sinks too far, the reel must travel a little faster and vice versa.
  • the belt pulls on the inlet and outlet sides of the roll stand are practically constant (within narrow tolerances).
  • the tape thickness can be varied relatively arbitrarily, without risking tape breaks and damage to the system.
  • FIG. 2 A rolling mill with a compensating roller according to the invention or dancer roll on the inlet and outlet side of a Roll stand is shown in Fig. 2 and described below. It is understood that this is only a Embodiment of the invention is.
  • a roll stand 1 is arranged in the center of the rolling mill, in the two work rolls 2, 3 determine the width of the roll gap, through which the band-shaped rolling material 4 is forcibly passed is to the actual thickness of the rolling material 4 before Roll stand 1 to the smaller target thickness after the roll stand 1 to reduce. Otherwise, the structure of the roll stand corresponds 1 the state of the art, so that further representation and Description is dispensed with and only two backup rollers or rollers 5, 6 and a device 7 are shown, with the device 7, the rollers perpendicular to the metal strip are adjustable to determine the width of the roll gap or to be able to change.
  • the input thickness of the tape 4 before the roll stand 1 is assumed to be constant, as is the section 8 shows the line in the diagram according to FIG.
  • the thickness of the strip material should be reduced to a target value as determined by the Section 9 of the line in the diagram shown in FIG. 1 is.
  • This target thickness of the strip material should now differ not constant from the state of the art, but rather be different, the change in target thickness periodically should repeat itself at a relatively high level Belt running speed (partial figure 1a).
  • the roll stand 1 is speed-controlled and set to the desired target speed
  • the dancer rolls 12, 13 are force-controlled to achieve the desired To apply the tape tension
  • the reels 10 and 11 are speed-controlled, taking into account the target speed of the respective coil diameter to the mean value of the belt speed is set, i.e. that from the uncoiler 10 as much tape 4 is unwound as the rolling stand 1 moves in and that so much tape 4 is wound up from the reel 11, as the mill stand 1 releases on the outlet side.
  • the dancer roles 12, 13 are adjustable up and down like it is expressed by the double arrows 14, 15. To the functions reference is made in detail to what has been said above.
  • the rolling force corresponding to the periodic or cyclical variable changes in thickness of the strip material periodically or fluctuates cyclically.
  • This can lead to in the strip material in its central region in the longitudinal direction of the strip form successive waves when the thickness decrease of the rolled strip is relatively small, and that form such waves in the edge areas of the rolled strip, if the reduction in thickness of the rolled strip is relatively large.
  • the Problem of this edge or medium wave training is manageable, if periodic changes in thickness in relative large intervals are made and the adjustments to the need the edge wave suppression or elimination and Medium wave suppression or elimination only at large intervals exists, be it because of the spatial, or because of the time intervals between two successive changes in thickness are correspondingly large, or, in other words, Flatness control systems only on relatively long-wave Process changes have to react.
  • the present invention shows in her further training how the described Problem can be solved if the distance between two each of periodically recurring changes in thickness short and in particular shorter than the distance between the Roll stand and a flatness measuring system is.
  • the problem is illustrated in FIG. 3.
  • the mill stand 1 follows a thickness measurement on the rolled strip 4 in the thick area n + 1, in Distance 18 from the mill stand, while in the direction of Roll strip feed preceding thick strip area n at a distance 19 from the roll stand 12 by means of a flatness measuring system 16 the flatness of the rolled strip is determined.
  • the next thick area has n + 1 already leave the mill stand 1, a consideration is no longer possible for the range n + 1, but only for later thick strip sections from n + 2, for the a new appointment has been made. This condition should be removed and corrections to maintain optimal flatness can be taken into account for the rolling of the section n + 1.
  • Determining the deviation of the actual value from the target value and a new setpoint is already calculated for the next strip section to be rolled.

Abstract

The arrangement has a roller system (1) with a roller set and a roller gap setting system. The strip (4) passes from a spool (10) into the gap with an initial thickness and leaves the gap with a desired thickness and onto another spool (11). The strip passes in loops round compensation rollers (12,13) between the spools and the roller system that are regulated to achieve a desired strip tension.

Description

Die vorliegende Erfindung bezieht sich auf das Walzen von Bändern, mittels eines Walzgerüstes mit einem Walzensatz zur Begrenzung des Walzspaltes und einem Anstellsystem zur Bestimmung der Weite des Walzspaltes. Vor dem Walzgerüst befindet sich eine Abwickelhaspel, eine Aufwickelhaspel ist dem Walzgerüst nachgeordnet. Das in seiner Dicke zu reduzierende Bandmaterial wird von der Abwickelhaspel unter Zug abgewickelt, durch den Walzspalt zwischen den Walzen des Walzensatzes hindurchgeführt und wiederum unter Zug auf die Aufwickelhaspel aufgewickelt. Angestrebt wird dabei eine möglichst gleichmäßige Dicke des bandförmigen Walzgutes nach dem Verlassen des Walzspaltes, wie selbstverständlich auch das auf der Abwickelhaspel in der Form eines Coils befindliche bandförmige Ausgangswalzgut eine möglichst gleiche Dicke über die gesamte Länge haben soll. Es soll also bei den bekannten Lösungen das bandförmige Walzgut eine möglichst konstante Ausgangsdicke und eine möglichst konstante, geringere Enddicke haben. Sollen, beispielsweise im Karosseriebau, flächige Bleche in verschiedenen Bereichen unterschiedliche Dicken haben, so werden Blechbänder unterschiedlicher Dicken miteinander verschweißt.The present invention relates to the rolling of strips, by means of a roll stand with a set of rollers for limitation of the roll gap and an adjustment system for determination the width of the roll gap. Located in front of the rolling stand there is a decoiler, a decoiler is the roll stand subordinate. The strip material to be reduced in thickness is unwound from the decoiler under tension, passed through the nip between the rolls of the roll set and again under tension on the take-up reel wound up. The aim is to be as uniform as possible Thickness of the strip-like rolling stock after leaving the Roll gap, as is naturally the case on the decoiler strip-shaped starting rolling stock in the form of a coil the same possible thickness over the entire length Length. So it should be with the known solutions strip-shaped rolling stock has a starting thickness that is as constant as possible and have a constant, smaller final thickness as possible. Should, for example in body construction, sheet metal in various Areas have different thicknesses, so are metal strips different thicknesses welded together.

Im Laborbetrieb wurden auch schon Blechbänder gewalzt, die in Längsrichtung des Bandes aufeinanderfolgenden Bandabschnitten unterschiedlicher Dicken haben. Folgen einmalig Abschnitte unterschiedlicher Dicken aufeinander, so kann das relativ problemlos durch Veränderung der Weite des Walzspaltes erfolgen. Sheet metal strips have already been rolled in the laboratory Longitudinal direction of the belt successive belt sections of different thicknesses. One-off sections follow different sections Thicknesses on each other, it can be relatively easy by changing the width of the roll gap.

Sollen jedoch periodisch Streifenabschnitte unterschiedlicher Dicken aufeinanderfolgen, so kann nur bei einer relativ geringen Bandlaufgechwindigkeit ein sauberer Übergang zwischen den einzelnen unterschiedlich dicken Bandabschnitten gewährleistet werden. Die mögliche Bandlaufgeschwindigkeit ist zu gering, um den Laborbetrieb in den Bereich industrieller Massenfertigung zu übernehmen. Die Probleme bei der Fertigung von Bändern mit periodisch aufeinanderfolgenden Bandabschnitten unterschiedlicher Banddicken sind in der Tatsache begründet, dass bei Veränderung des Abwalzgrades sich die Bandgeschwindigkeiten am Eingang und am Ausgang des Walzspaltes verändern und Voreilung und Rückstau des Bandes relativ zur Umfangsgechwindigkeit der Arbeitswalzen mit der Stichveränderung verändern. Darum müssen die Haspelantriebe in ihrer Gechwindigkeit ständig an die veränderlichen Prozeßbedingungen angepaßt werden. Hierzu sind Geschwindigkeitsänderungen bis zu 50% der Nenngeschwindigkeit in kurzer Zeit (z.B. 0,15 Sek.) erforderlich. Dies führt bei den bisher bekannten Kaltwalzwerken zu heftigen Schwankungen der-Bandzüge. Daraus folgen ein unregelmäßiger Aufbau des aufzuwikkelnden Coils, unzulässige Abweichungen der Endwalz-Dicke von ihrem Sollwert, Risiko von Bandrissen und Beschädigung von Anlagenteilen.However, periodically, stripe sections should be different Thicknesses follow one another, so only a relatively small one Belt speed a smooth transition between the individual band sections of different thicknesses guaranteed become. The possible tape running speed is too low to the laboratory operation in the area of industrial mass production to take over. The problems with the production of tapes periodically consecutive band sections different Strip thicknesses are due to the fact that when changing the degree of rolling, the belt speeds on Change the entrance and exit of the roll gap and advance and backing up the tape relative to the peripheral speed of the Change work rolls with the stitch change. That’s why the speed of the reel drives is constantly changing Process conditions are adjusted. For this are speed changes up to 50% of the nominal speed in short time (e.g. 0.15 seconds) is required. This leads to the previously known cold rolling mills for violent fluctuations in strip tension. This results in an irregular structure of what is to be wound up Coils, impermissible deviations in the final roll thickness of their setpoint, risk of belt breaks and damage to system parts.

Mit großen Arbeitsgeschwindigkeiten sind die bisher vorgeschlagenen Verfahren nicht durchführbar. Senkt man die Geschwindigkeit der Anlage so weit ab, dass der Prozeß beherrschbar ist, so wird die Produktionsleistung so gering, dass der anlagetechnische Aufwand nicht gerechtfertigt wird. Mit den bisher gegebenen Möglichkeiten können Bänder mit periodisch aufeinanderfolgenden Bandabschnitten unterschiedlicher Dicke wirtschaftlich nicht gefertigt werden. At high working speeds, the previously proposed are Procedure not feasible. If you lower the speed the system so far that the process is manageable production output is so low that the technical investment is not justified. With the possibilities given so far, tapes can be periodically successive band sections different Thickness cannot be manufactured economically.

Vor diesem technischen und wirtschaftlichen Hintergrund ist es nun Aufgabe der vorliegenden Erfindung, eine Möglichkeit aufzuzeigen, auf wirtschaftlich akzeptable Weise zu Coils aufgewickelte Metall-Bänder unter Zug abzuwickeln, in der Dicke zu reduzieren und anschließend unter Zug wieder aufzuwickeln, wobei eine relativ konstante Banddicke (= Ist-Dicke) auf der Einlaufseite unterstellt werden soll und eine periodisch veränderliche Banddicke (=Soll-Dicke) auf der Auslaufseite erreichbar sein woll, wie es in Fig. 1 diagrammartig dargestellt ist.Against this technical and economic background, it is now the object of the present invention to show a possibility wound into coils in an economically acceptable manner Unwind metal strips under tension, in thickness too reduce and then rewind under tension, whereby a relatively constant strip thickness (= actual thickness) on the Inlet side should be assumed and a periodically changing Strip thickness (= target thickness) can be reached on the outlet side want to be, as shown diagrammatically in FIG. 1 is.

Die Mittel zur Lösung dieser Aufgabe ergeben sich aus den Ansprüchen.The means for solving this problem result from the claims.

Demzufolge wird bei der Erfindung ein Walzwerk als relevanter Stand der Technik vorausgesetzt, das einlaufseitig eine Abhaspel vor einem Walzgerüst und vorzugsweise auch Umlenkrollen, Bandzugmeßeinrichtungen und Banddickenmeßgeräte aufweist sowie auslaufseitig eine Aufhaspel nach dem genannten Walzgerüst sowie vorzugsweise wiederum Umlenkrollen, Bandzugmeßeinrichtungen und Banddickenmeßgeräte aufweist. Gekennzeichnet ist die Erfindung vor allem durch eine Ausgleichs- bzw. Tänzerrolle einlaufseitig und eine weitere Tänzerrolle auslaufseitig.Accordingly, in the invention, a rolling mill becomes more relevant State of the art provided that there is a decoiler on the inlet side in front of a roll stand and preferably also pulleys, Has tape tension measuring devices and tape thickness measuring devices as well a reel on the outlet side according to the roll stand mentioned and preferably again deflection rollers, tape tension measuring devices and has tape thickness gauges. It is marked Invention above all through a balancing or dancer role on the inlet side and another dancer roll on the outlet side.

Die Erfindung wird anhand der Zeichnung erläutert, in der zeigen

Fig. 1
ein Diagramm zur Erläuterung von in Bandlängsrichtung aufeinanderfolgenden Bandabschnitten verschiedener Dicke,
Fig. 1a
einen größeren Bandlängsschnitt in kleinerer Darstellung,
Fig. 2
in diagrammartiger Darstellung eine erfindungsgemäße Anlage bezw. Vorrichtung,
Fig. 3
eine Darstellung zur Erläuterung des Problems, das mit der Erfindung in einer weiteren Ausgestaltung gelöst wird und
Fig. 4
eine weitere Erläuterung zu der weiteren Ausgestaltung der Erfindung.
The invention is explained with reference to the drawing, in which show
Fig. 1
1 shows a diagram for explaining consecutive band sections of different thicknesses in the longitudinal direction of the band,
Fig. 1a
a larger band longitudinal section in a smaller representation,
Fig. 2
a plant according to the invention in a diagrammatic representation. Contraption,
Fig. 3
a representation to explain the problem that is solved with the invention in a further embodiment and
Fig. 4
a further explanation of the further embodiment of the invention.

Mit einem solchen erfindungsgemäßen Walzwerk wird bevorzugt folgende Regelstrategie angewendet.With such a rolling mill according to the invention is preferred following control strategy applied.

Das Walzgerüst (Hauptantrieb) wird drehzahlgeregelt auf die gewünschte Soll-Geschwindigkeit eingestellt. Beim stationären Walzbetrieb drehen sich die Walzen also mit praktisch konstanter Umfangsgeschwindigkeit.The roll stand (main drive) is speed-controlled on the desired speed set. In stationary Rolling operation, the rollers rotate with practically constant Peripheral speed.

Die Tänzerrollen werden kraftgeregelt mit der Aufgabe, den gewünschten Bandzug aufzubringen.The dancer roles are force-controlled with the task, the desired one Apply tape tension.

Die Haspel werden drehzahlgeregelt, wobei die Soll-Drehzahl unter Berücksichtigung des jeweiligen Coil-Durchmessers auf den Mittelwert der Bandgeschwindigkeit eingestellt wird.The reel is speed controlled, with the target speed taking into account the respective coil diameter the average of the belt speed is set.

Das heißt, dass die Abhaspel soviel Band abspult, wie das Walzgerüst im Mittelwert einzieht und dass die Aufhaspel soviel Band aufwickelt,wie das Walzgerüst an seiner Auslaufseite abgibt.That means that the reel unwinds as much tape as that Rolling mill moves in on average and that the reel up so much The tape is wound up like the roll stand on its outlet side delivers.

Hierbei werden die Positionen der Tänzerrollen überwacht und daraus werden Stellsignale zur Korrektur der Haspelgeschwin   digkeiten abgeleitet, beispielsweise wie folgt:
   sinkt die einlaufseitige Tänzerrolle zu tief unter den unteren Schaltpunkt ab, wird die Abhaspel entsprechend verzögert.
   Steigt diese Tänzerrolle zu weit über den oberen Schaltpunkt auf, wird die Abhaspel beschleunigt.
   Bei zu weit absinkender auslaufseitiger Tänzerrolle muß die Aufhaspel etwas schneller fahren und umgekehrt.The positions of the dancer rolls are monitored and control signals for correcting the reel speeds are derived, for example as follows:
If the dancer roll on the inlet side drops too low below the lower switching point, the uncoiling is delayed accordingly.
If this dancer roll rises too far above the upper switching point, the uncoiling is accelerated.
If the dancer roll on the outlet side sinks too far, the reel must travel a little faster and vice versa.

Im Ergebnis gleichen bei der Erfindung die Tänzerrollen den variablen Materialfluß an Eingang und Ausgang des Walzgerüstes aus.As a result, the dancer roles are the same in the invention variable material flow at the entrance and exit of the roll stand out.

Sowohl die Abhaspel als auch die Aufhaspel fahren mit praktisch konstanter Wickelgeschwindigkeit unabhängig vom aktuellen Coil-Durchmesser.Both the decoiler and the coiler are practical constant winding speed regardless of the current one Coil diameter.

Die Bandzüge an Ein- und Auslaufseite des Walzgerüstes sind praktisch (in engen Toleranzen) konstant.The belt pulls on the inlet and outlet sides of the roll stand are practically constant (within narrow tolerances).

Damit sind die Voraussetzungen für ein gut gewickeltes Coil auf der Auslaufseite gegeben.This is the prerequisite for a well-wound coil given on the outlet side.

Außerdem kann die Banddicke relativ willkürlich variiert werden, ohne Bandrisse und Beschädigungen der Anlage zu riskieren.In addition, the tape thickness can be varied relatively arbitrarily, without risking tape breaks and damage to the system.

Als weitere Ausgestaltung der Erfinndung wird vorgeschlagen, dass bei periodischer Veränderung der Soll-Dicke auf der Auslaufseite die Zuordnung der Bewegung der Tänzerrollen zur Veränderung der Banddicke (bekannte Soll-Funktion) zu beobachten. As a further embodiment of the invention, it is proposed that that with periodic changes in the target thickness on the outlet side the assignment of the movement of the dancer roles to the change the strip thickness (known target function).

Daraus kann man eine aus anderen Regelungsaufgaben bekannte Störgrößenaufschaltung (Vorsteuerung) ableiten. Wenn man zum Beispiel gelernt hat, wann eine Tänzerrolle mit einer bestimmten Beschleunigung bewegt werden muß, kann man die entsprechenden Beschleunigungs-Zusatzkräfte auf den Sollwert der Zugkraft der Tänzerrolle aufschalten. Damit ist eine weitere Verbesserung der Konstanz der Bandzüge möglich. Dies wirkt sich günstig auf die Stabilität des Prozesses und insbesondere auf die Qualität des Walzgutes aus (z.B. Dickentoleranzen und Oberflächenqualität).From this one can create a familiar one from other control tasks Derive feedforward control (feedforward control). If you go to Example learned when a dancer role with a particular one Acceleration must be moved, you can use the appropriate Additional acceleration forces to the target value of the pulling force the dancer role. This is another improvement the consistency of the belt pulls possible. This affects favorably on the stability of the process and in particular the quality of the rolling stock (e.g. thickness tolerances and Surface quality).

Eine Walzanlage mit erfindungsgemäß je einer Ausgleichsrolle bzw. Tänzerrolle an der Einlauf- und der Auslaufseite eines Walzgerüstes ist in Fig. 2 dargestellt und nachfolgend beschrieben. Es versteht sich, dass es sich dabei nur um ein Ausführungsbeispiel der Erfindung handelt.A rolling mill with a compensating roller according to the invention or dancer roll on the inlet and outlet side of a Roll stand is shown in Fig. 2 and described below. It is understood that this is only a Embodiment of the invention is.

Im Zentrum der Walzanlage ist ein Walzgerüst 1 angeordnet, in dem zwei Arbeitswalzen 2, 3 die Weite des Walzspaltes bestimmen, durch den das bandförmige Walzmaterial 4 zwangsweise hindurchgeführt wird, um die Istdicke des Walzmaterials 4 vor dem Walzgerüst 1 zur geringeren Solldicke nach dem Walzgerüst 1 zu reduzieren. Im übrigen entspricht der Aufbau des Walzgerüstes 1 dem Stand der Technik, sodass auf weitere Darstellung und Beschreibung verzichtet wird und nur noch zwei Stützwalzen bzw. -rollen 5, 6 sowie eine Einrichtung 7 dargestellt sind, wobei mit der Einrichtung 7 die Walzen senkrecht zum Metallband verstellbar sind, um die Weite des Walzspaltes bestimmen bzw. verändern zu können. Die Eingangsdicke des Bandes 4 vor dem Walzgerüst 1 wird als konstant unterstellt, wie es der Abschnitt 8 des Linienzuges im Diagramm gemäß Fig. 1 zeigt, in dem die Dicke des Metallbandes über dessen Länge dargestellt ist. Die Dicken- und Längenangaben sind in besonderem Maße beispielhaft. Nach dem Walzgerüst 1 soll die Dicke des Bandmaterials auf einen Soll-Wert verringert sein, wie es durch den Abschnitt 9 des Linienzuges im Diagramm gemäß Fig. 1 dargestellt ist. Diese Soll-Dicke des Bandmaterials soll nun abweichend vom industriellen Stand der Technik nicht konstant, sondern unterschiedlich sein, wobei die Solldickenveränderung periodisch sich wiederholen soll und zwar bei relativ hoher Bandlaufgeschwindigkeit (Teilfigur 1a).A roll stand 1 is arranged in the center of the rolling mill, in the two work rolls 2, 3 determine the width of the roll gap, through which the band-shaped rolling material 4 is forcibly passed is to the actual thickness of the rolling material 4 before Roll stand 1 to the smaller target thickness after the roll stand 1 to reduce. Otherwise, the structure of the roll stand corresponds 1 the state of the art, so that further representation and Description is dispensed with and only two backup rollers or rollers 5, 6 and a device 7 are shown, with the device 7, the rollers perpendicular to the metal strip are adjustable to determine the width of the roll gap or to be able to change. The input thickness of the tape 4 before the roll stand 1 is assumed to be constant, as is the section 8 shows the line in the diagram according to FIG. 1, in which shows the thickness of the metal strip over its length is. The thickness and length information are particularly exemplary. After the roll stand 1, the thickness of the strip material should be reduced to a target value as determined by the Section 9 of the line in the diagram shown in FIG. 1 is. This target thickness of the strip material should now differ not constant from the state of the art, but rather be different, the change in target thickness periodically should repeat itself at a relatively high level Belt running speed (partial figure 1a).

Hierzu ist zwischen Abhaspel 10 und Walzgerüst 1 einerseits und Aufhaspel 11 und Walzgerüst 1 andererseits je eine Ausgleichs- bzw. Tänzerrolle 12 bzw. 13 angeordnet.For this purpose, on the one hand, between uncoiler 10 and roll stand 1 and reel 11 and roll stand 1 on the other hand each a compensating or dancer roll 12 or 13 arranged.

Wie bereits oben ausgeführt, wird das Walzgerüst 1 drehzahlgeregelt und auf die gewünschte Sollgeschwindigkeit eingestellt, werden die Tänzerrollen 12, 13 kraftgeregelt, um den gewünschten Bandzug aufzubringen, und werden die Haspel 10 und 11 drehzahlgeregelt, wobei die Solldrehzahl unter Berücksichtigung des jeweiligen Coil-Durchmessers auf den Mittelwert der Bandgeschwindigkeit eingestellt wird, d.h. dass von der Abhaspel 10 soviel Band 4 abgespult wird, wie das Walzgerüst 1 einzieht und dass von der Aufhaspel 11 soviel Band 4 aufgewickelt wird, wie das Walzgerüst 1 auf der Auslaufseite abgibt. Die Tänzerrollen 12, 13 sind nach oben und unten verstellbar, wie es durch die Doppelpfeile 14, 15 ausgedrückt ist. Zu den Funktionen im einzelnen wird auf das oben Gesagte verwiesen.As already stated above, the roll stand 1 is speed-controlled and set to the desired target speed, the dancer rolls 12, 13 are force-controlled to achieve the desired To apply the tape tension, and the reels 10 and 11 are speed-controlled, taking into account the target speed of the respective coil diameter to the mean value of the belt speed is set, i.e. that from the uncoiler 10 as much tape 4 is unwound as the rolling stand 1 moves in and that so much tape 4 is wound up from the reel 11, as the mill stand 1 releases on the outlet side. The dancer roles 12, 13 are adjustable up and down like it is expressed by the double arrows 14, 15. To the functions reference is made in detail to what has been said above.

Insbesondere bei der oben beschriebenen Vorrichtung gemäß der Erfindung und deren Arbeitsweise kann das Problem auftreten, dass die Walzkraft entsprechend den periodisch bzw. zyklisch veränderlichen Dickenveränderungen des Bandmaterials periodisch bzw. zyklisch schwankt. Dies kann dazu führen, dass sich im Bandmaterial in dessen mittlerem Bereich in der Bandlängsrichtung aufeinanderfolgende Wellen ausbilden, wenn die Dikkenabnahme des Walzbandes relativ gering ist, und dass sich solche Wellen in den Randbereichen des Walzbandes ausbilden, wenn die Dickenabnahme des Walzbandes relativ groß ist. Das Problem dieser Rand- bzw. Mittelwellenausbildung ist beherrschbar, wenn periodische Dickenveränderungen in relativ großen Abständen erfolgen und die Anpassungen an die Notwendigkeit der Randwellenunterdrückung bzw. -beseitigung und der Mittelwellenunterdrückung bzw. -beseitigung nur in großen Abständen besteht, sei es, weil die räumlichen, sei es weil die zeitlichen Abstände zwischen zwei aufeinanderfolgenden Dickenveränderungen entsprechend groß sind, oder, anders ausgedrückt, Planheitsregelungssysteme nur auf relativ langwellige Prozeßveränderungen reagieren müssen. Die vorliegende Erfindung zeigt in ihrer weiteren Ausbildung auf, wie das geschilderte Problem dann gelöst werden kann, wenn der Abstand zwischen je zwei von periodisch wiederkehrenden Dickenänderungen kurz und insbesondere kürzer als der Abstand zwischen dem Walzgerüst und einem Planheitsmeßsystem ist. Erfindungsgemäß wird im Zusammenhang damit vorgeschlagen, Mittel für einen Vergleich zwischen Banddickenistwert und vorgegebenem Banddikkensollwert in der Form einer Bandverfolgungseinrichtung zu installieren und gemäß Fig. 3, 4 in der Weise zu nutzen, dass die tatsächliche Planheit des Bandes in einem Abschnitt "dick" gemessen und mit einem vorgegebenen Sollwert verglichen wird. Ergibt sich eine Abweichung des ermittelten tatsächlichen Istwertes vom Sollwert, so wird eine Veränderung der für die Planheit ursächlichen Faktoren, insbesondere also der Durchbiegung der Arbeitswalzen, bewirkt so, dass bereits der nächstfolgende Abschnitt "dick" in verbesserter Planheit gewalzt wird. In particular in the device described above according to the Invention and how it works the problem may arise that the rolling force corresponding to the periodic or cyclical variable changes in thickness of the strip material periodically or fluctuates cyclically. This can lead to in the strip material in its central region in the longitudinal direction of the strip form successive waves when the thickness decrease of the rolled strip is relatively small, and that form such waves in the edge areas of the rolled strip, if the reduction in thickness of the rolled strip is relatively large. The Problem of this edge or medium wave training is manageable, if periodic changes in thickness in relative large intervals are made and the adjustments to the need the edge wave suppression or elimination and Medium wave suppression or elimination only at large intervals exists, be it because of the spatial, or because of the time intervals between two successive changes in thickness are correspondingly large, or, in other words, Flatness control systems only on relatively long-wave Process changes have to react. The present invention shows in her further training how the described Problem can be solved if the distance between two each of periodically recurring changes in thickness short and in particular shorter than the distance between the Roll stand and a flatness measuring system is. According to the invention is proposed in connection with this, funds for a Comparison between the actual strip thickness and the specified strip thickness setpoint in the form of a tape tracking device install and use according to Fig. 3, 4 in such a way that the actual flatness of the tape in a "thick" section is measured and compared with a predetermined target value. If the actual actual value determined deviates from the target value, so a change in for the Flatness of causal factors, in particular the deflection of the work rolls, so that the next section "thick" rolled in improved flatness becomes.

Entsprechend kann für die Abschnitte "dünn" verfahren werden.The same can be done for the sections "thin".

In Fig. 3 ist das Problem verdeutlicht. Dem Walzgerüst 1 folgt eine Dickenmessung am Walzband 4 im dicken Bereich n + 1, im Abstand 18 vom Walzgerüst, während im in der Richtung des Walzbandvorschubes vorhergehenden dicken Bandbereich n im Abstand 19 vom Walzgerüst 12 mittels eines Planheitsmeßsystems 16 die Planheit des Walzbandes ermittelt wird. Während eine etwaige Abweichung des Planheitsistwertes vom Sollwert im Bereich n festgestellt wird, hat der nächstfolgende dicke Bereich n + 1 bereits das Walzgerüst 1 verlassen, eine Berücksichtigung für den Bereich n + 1 ist nicht mehr möglich, sondern erst für spätere dicke Bandabschnitte ab n + 2, für die eine Neueinstellung erfolgt ist. Dieser Zustand soll beseitigt werden und Korrekturen zum Erhalt optimaler Planheit bereits für das Walzen des Abschnittes n + 1 berücksichgt werden können. Dies geschieht mit einem symbolisch dargestellten Bandverfolgungssystem 17 das insbesondere ein Schieberegister ist, wie es an sich von der Massenfluß-Regelung bekannt ist. Es stellt sich der Erfolg gemäß Fig. 4 ein, indem im Bereich "dick" das Messen der Planheit im Bereich "dick" und im Bereich "dünn" das Messen der Planheit im Bereich "dünn" erfolgt.The problem is illustrated in FIG. 3. The mill stand 1 follows a thickness measurement on the rolled strip 4 in the thick area n + 1, in Distance 18 from the mill stand, while in the direction of Roll strip feed preceding thick strip area n at a distance 19 from the roll stand 12 by means of a flatness measuring system 16 the flatness of the rolled strip is determined. During one any deviation of the flatness actual value from the nominal value in the range n is determined, the next thick area has n + 1 already leave the mill stand 1, a consideration is no longer possible for the range n + 1, but only for later thick strip sections from n + 2, for the a new appointment has been made. This condition should be removed and corrections to maintain optimal flatness can be taken into account for the rolling of the section n + 1. This is done with a symbolically shown tape tracking system 17 which is in particular a shift register, as is known per se from the mass flow regulation. It the success according to FIG. 4 occurs by in the area "thick" the measurement of flatness in the area "thick" and in the area "thin" the flatness is measured in the "thin" area.

Das Ermitteln der Abweichung des Istwertes vom Sollwert und das Berechnen eines neuen Sollwertes erfolgen bereits für den nächsten noch zu walzenden Bandabschnitt.Determining the deviation of the actual value from the target value and a new setpoint is already calculated for the next strip section to be rolled.

Claims (9)

Vorrichtung zum Walzen von Bändern mit periodisch veränderlicher Banddicke, wobei die Walzvorrichtung ein Walzgerüst mit einem Walzensatz und einem Anstellsystem zur Bestimmung des Walzspaltes aufweist, dem das Bandmaterial mit einer Ausgangsdicke eingangsseitig von einer Abhaspel aus zugeführt wird und von dem aus das Bandmaterial mit der jeweils gewollten Enddicke ausgangsseitig einer Aufhaspel zugeführt wird, dadurch gekennzeichnet, dass sowohl zwischen der Abhaspel (10) und dem Walzgerüst (1) als auch zwischen dem Walzgerüst (1) und der Aufhaspel (11) eine Ausgleichs-bzw.Tänzerrolle (12, 13) angeordnet ist, um die das Bandmaterial (4) schleifenförmig herumgeführt ist, und die bei konstanter Umfangsgeschwindigkeit der den Walzspalt bestimmenden Walzen (2, 3) des Walzgerüsts (1) geregelt werden, um einen gewollten Bandzug aufzubringen.Device for rolling strips with periodically variable strip thickness, the rolling device having a roll stand with a set of rollers and a setting system for determining the roll gap, to which the strip material with an initial thickness is fed on the input side from a decoiler and from which the strip material with the desired one Final thickness is fed to a reel on the output side, characterized in that a compensating or dancer roll (12, 13) is arranged both between the uncoiler (10) and the roll stand (1) and between the roll stand (1) and the reel (11) around which the strip material (4) is looped around and which are regulated at constant circumferential speed of the rolls (2, 3) of the roll stand (1) that determine the roll gap in order to apply a desired strip tension. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Tänzerrollen (12, 13) mit dem Ziel kraftgeregelt werden, dass ein gewollter Bandzug vorliegt.Apparatus according to claim 1, characterized in that the dancer rolls (12, 13) are force-controlled with the aim that there is a desired tape tension. Vorrichtung nach den Ansprüchen 1 und 2, dadurch gekenn zeichnet, dass die Haspel (10, 11) drehzahlgeregelt sind.Device according to claims 1 and 2, characterized in that the reel (10, 11) are speed-controlled. Vorrichtung nach den Ansprüchen 1 bis 3, dadurch gekenn zeichnet, dass die Soll-Drehzahl der Haspel (10, 11) unter Berücksichtigung des jeweiligen Coil-Durchmessers auf den Mittelwert der Bandgeschwindigkeit eingestellt wird und von der Abhaspel (10) so viel Band (4) abgespult wird, wie im Mittel Band in den Walzspalt eingezogen wird und so viel Band auf die Aufhaspel (11) aufgewickelt wird, wie Band den Walzspalt verläßt. Device according to claims 1 to 3, characterized in that the target speed of the reel (10, 11) is adjusted to the mean value of the strip speed, taking into account the respective coil diameter, and as much strip (4) from the reel (10) ) is unwound, as on the average strip is drawn into the roll gap and as much strip is wound onto the reel (11) as the strip leaves the roll gap. Vorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, dass Ortsverlagerungen der Tänzerrollen (12, 13) infolge der Gleichgewichtsstörungen zwischen Bandabzug von der Abhaspel (10) und dem Bandeinzug in den Walzspalt und/oder zwischen Bandaustritt aus dem Walzspalt und Aufwickeln des Bandes auf die Aufhaspel (11) ermittelt und in Regelsignale für die Drehzahlen von Ab- und Aufhaspel umgesetzt werden.Device according to claims 1 to 4, characterized in that the dancer rolls (12, 13) are displaced as a result of the equilibrium disturbances between strip take-off from the uncoiler (10) and the strip feed into the roll gap and / or between strip exit from the roll gap and winding up of the strip the reel (11) is determined and converted into control signals for the speeds of reeling and reeling. Vorrichtung insbesondere nach einem der Ansprüche 1 bis 5, gekennzeichnet durch ein Mittel zum Verfolgen des Materialflusses und zur Lieferung von Befehlssignalen für die Bestimmung der in periodischer Folge sich ändernden Banddikke.Device in particular according to one of claims 1 to 5, characterized by a means for tracking the material flow and for supplying command signals for determining the strip thickness, which changes in a periodic sequence. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass das Mittel zum Verfolgen des Materialflusses ein an sich bekanntes Schieberegister ist.Apparatus according to claim 6, characterized in that the means for tracking the material flow is a shift register known per se. Vorrichtung nach Anspruch 6 oder Anspruch 7, gekennzeichnet durch Mittel zur Verbesserung der Konstanz des Bandzuges durch Ermittlung der Periodizität der Banddickenänderung und die Aufschaltung einer Störgröße für die Kompensation der auf die Ausgleichs- bzw. Tänzerrollen (12, 13) einwirkenden Beschleunigungskräfte.Apparatus according to claim 6 or claim 7, characterized by means for improving the consistency of the strip tension by determining the periodicity of the strip thickness change and the application of a disturbance variable for the compensation of the acceleration forces acting on the compensating or dancer rolls (12, 13). Vorrichtung nach einem der Ansprüche 6 bis 8, gekennzeichnet durch eine zyklische abtastende Planheitsregelung, die auf der Basis eines Meßsystems zur Materialverfolgung jeweils die im Bereich des Bandaustritts aus dem Walzspalt gemessene Bandplanheit-Istwert mit einem vorgegebenen Bandplanheit-Sollwert vergleicht und Korrekturbefehle für die Walzenbiegung und gegebenenfalls andere, die Bandplanheit beeinflussende Komponenten bildet.Device according to one of claims 6 to 8, characterized by a cyclic scanning flatness control which, on the basis of a measuring system for material tracking, compares the actual strip flatness value measured in the area of the strip exit from the roll gap with a predetermined strip flatness target value and correction commands for the roll bending and possibly other components that influence the flatness of the strip.
EP01102289A 2000-02-02 2001-02-01 Device for rolling strips with a periodically variable thickness Expired - Lifetime EP1121990B2 (en)

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DE10310399A1 (en) * 2003-03-07 2004-09-23 Sundwig Gmbh Device and method for rolling metal strips
DE10310399B4 (en) * 2003-03-07 2005-03-03 Sundwig Gmbh Apparatus and method for rolling metal strips
WO2007104616A1 (en) * 2006-03-15 2007-09-20 Siemens Aktiengesellschaft Rolling method for rolled material for introducing a step in the rolled material
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US8356504B2 (en) 2006-03-15 2013-01-22 Siemens Aktiengesellschaft Rolling method for a rolled product for introducing a step into the rolled product
EP1908534A1 (en) * 2006-10-07 2008-04-09 ACHENBACH BUSCHHÜTTEN GmbH Rolling mill and method for flexible cold or hot one-way or reverse rolling of a metal strip
DE102008035738B4 (en) 2007-07-31 2020-06-18 Danieli Germany GmbH Rolling device
US20170239700A1 (en) * 2016-02-23 2017-08-24 Bilstein Gmbh & Co. Kg Method of and apparatus for rolling strip of fluctuating thickness
US10413949B2 (en) * 2016-02-23 2019-09-17 Bilstein Gmbh & Co. Kg Method of and apparatus for rolling strip of fluctuating thickness
CN106670242B (en) * 2017-02-09 2018-05-04 广西南南铝加工有限公司 The device of the offline Strip Shape of On-line Control
CN106670242A (en) * 2017-02-09 2017-05-17 广西南南铝加工有限公司 Device for controlling shape of off-line strip in on-line manner
DE102019215265A1 (en) 2018-12-06 2020-06-10 Sms Group Gmbh Method for operating a roll stand for step rolling
WO2020114976A1 (en) 2018-12-06 2020-06-11 Sms Group Gmbh Method for operating a roll stand for stepped rolling
CN113226580A (en) * 2018-12-06 2021-08-06 Sms集团有限公司 Method for handling rolling stands for stepped rolling
JP2022510024A (en) * 2018-12-06 2022-01-25 エス・エム・エス・グループ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Methods for operating rolling stands for stepwise rolling
CN113226580B (en) * 2018-12-06 2024-03-19 Sms集团有限公司 Method for actuating a rolling stand for stepped rolling
CN114074121A (en) * 2021-11-18 2022-02-22 东北大学 Speed compensation method for constant-speed rolling of variable-thickness plate strip

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EP1121990A3 (en) 2004-01-14
EP1121990B2 (en) 2012-02-29

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