EP1908534B1 - Rolling mill and method for flexible cold or hot one-way or reverse rolling of a metal strip - Google Patents

Rolling mill and method for flexible cold or hot one-way or reverse rolling of a metal strip Download PDF

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Publication number
EP1908534B1
EP1908534B1 EP20070018882 EP07018882A EP1908534B1 EP 1908534 B1 EP1908534 B1 EP 1908534B1 EP 20070018882 EP20070018882 EP 20070018882 EP 07018882 A EP07018882 A EP 07018882A EP 1908534 B1 EP1908534 B1 EP 1908534B1
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EP
European Patent Office
Prior art keywords
strip
roller
rolling mill
roller pair
eccentric
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Revoked
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EP20070018882
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German (de)
French (fr)
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EP1908534A1 (en
Inventor
Axel Dipl.-Ing. Barten (Eth)
Rainer Dipl.-Ing. Neukant
Werner Ing. Stahl
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Achenbach Buschhetten GmbH and Co KG
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Achenbach Buschhetten GmbH and Co KG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/24—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
    • 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
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/08—Coiler speed

Definitions

  • the invention relates to a rolling mill and to a method for flexible cold or warm disposable or reversing rolling of metal strip, in particular of steel, with variable strip thickness, with a roll stand having a set of rolls and a Anstellsystem for adjusting the roll gap, one of the rolling mill upstream Uncoiler and a rolling mill downstream reel for the rolled strip, which are equipped with a variable speed drive.
  • the EP 1 121 990 A2 describes a rolling mill for flexible rolling of strip material with a periodically varying strip thickness. Between the uncoiler and the roll stand and the hanger and the roll stand a Ausretesry disrupt dancer roll is arranged, around which the strip material is looped around. The position of the dancer roller to the horizontal belt plane is force-controlled to compensate for a changing material flow or a changing belt speed due to a changing material jam at the roll nip input and a changing material lead at the nip exit with an adjustment of the roll gap and set a constant strip tension.
  • the position changes of the dancer rollers due to the balance problems between the tape take-off from the uncoiler and the tape feeder in the nip and / or between the tape exit from the nip and the winding of the tape on the reel are continuously determined and in signals for speed control of the uncoiler and the coiler implemented.
  • the periodicity of the strip thickness change is determined, and a disturbance variable is applied to compensate for the acceleration forces acting on the dancer rollers.
  • a rolling mill for flexible rolling of metal strips in which the strip tensioning on the metal strip is regulated by means of a strip tension compensation device.
  • the tape tension compensation device is formed by a deflection roller which is displaceable or pivotable for changing the distance between the tape reels and the nip. By adjusting the deflection roller, the strip running geometry is adapted to the strip length located in each case between the reel and the rolling stand and thus the desired strip tension is maintained.
  • an S-roll unit is used as a tape storage, which is equipped for Bandzugregelung with a pivoting pulley with a hydraulic linear actuator, wherein at least one of the two pulleys is rotationally driven in order to optimally influence the tensile structure in the band.
  • the invention has for its object to develop a rolling mill and a method for flexible rolling of metal strip, compared to the rolling mills and rolling processes of the prior art for flexible rolling of strip material higher rolling speeds, taking into account the physical boundary conditions such as tape storage length, inertias of the actuators and band tension error due to deviation from the ideal acceleration characteristic, in particular in the reversal points of the band acceleration when the band thickness profile changes, and by avoiding abruptly opposite mass accelerations of the tape storage devices.
  • FIGS. 1 and 2 illustrated schematically rolling mill designs.
  • FIG. 1 shows the schematic structure of a 4-high mill for flexible cold-disposable rolling of metal strip with variable strip thickness.
  • the rolling mill comprises a roll stand 1, in which two work rolls 2, 3 and two support rolls 4, 5 and a setting system for adjusting the roll gap 6 are installed, a roll stand 1 upstream reel 7 and a roll stand downstream reel 8 for the rolled strip.
  • the host computer for the regulation of Banddickenprofils the strip thickness course additionally passes as a function of time to a Material Wegdiktor that generates a pilot-controlled torque application for the speed control of uncoiler and reel, taking into account the material backlog at the tape inlet side and the material advance on the strip outlet side of the rolling stand and in knowledge of the drive-specific torque control times.
  • This torque precontrol can be positive or negative depending on the thickness transition thick-thin or thin-thick and of the rolling direction.
  • the entire rolling process is carried out with a length segment and / or time segment control.
  • the in FIG. 2 shown rolling mill equipped with a arranged between the pay-off reel 7 and the roll stand 1 tape storage 10 and another arranged between the roll stand 1 and the reel 8 tape storage 11.
  • the band memories 10, 11 are used to compensate for remaining residual errors in the mass flow of the rolled strip due to the limited drive dynamics of the reel drives in the area of the reversal points of the belt acceleration with a change in the strip thickness profile.
  • the tape storage 10, 11 are each formed as an S-pair of rollers 12 having an upper and a lower guide roller 13, 14, an eccentric mounting of the axes of rotation 15, 16 of the upper and lower guide rollers 13, 14 in bearing units 17, 18 and a variable Adjustment of the mutual position of the axes of rotation 15, 16 of the two guide rollers 15, 16 by a rotational adjustment of one or both axes of rotation 15, 16 about the bearing units 17, 18 by means of a rotary drive for setting different loop lengths of in a loop 19 around the two guide rollers 13, 14th rolled strip 9 guided by the S-roller pair 12.
  • the different loop lengths are used in conjunction with the eccentric adjustment Fast tape storage used to catch remaining deviations from the target acceleration.
  • the eccentric adjustment has the advantage over the known tape stores that the adjustment can be made comparatively quickly, since no large masses with corresponding inertia have to be accelerated over a large distance.
  • the eccentric adjustment of the axes of rotation of the pulleys of the S-roller pair can be carried out both pilot-controlled by the Material Wegdiktor as well as regulated by the measured strip tension.
  • the rolling process can also be extended by returning process measured values, such as, for example, strip tension and / or eccentric adjustment force, as opposed to the calculated determination of state variables.
  • the angle of rotation of the eccentric adjustment of the axis of rotation 15 of at least one deflection roller 13 of the S-roller pair 12 is determined from the Exzenterausgangsgna and as a function of the belt speed error from the acceleration deviation.
  • the angular velocity of the eccentric adjustment of the axis of rotation 15 of at least one deflection roller 13 of the S-roller pair 12 is determined from the Exzenterausgangsgna and as a function of the belt speed error from the acceleration deviation.
  • the angle of rotation and the angular speed of the eccentric adjustment of the axis of rotation 15 of at least one deflection roller 13 of the S-roller pair 12 can be determined from the eccentric output position and depending on the belt speed error from the acceleration deviation.
  • the dead centers of the eccentric adjustment of the rotational axis 15 of at least one deflection roller 13 of the S-roller pair 12 are arranged approximately on the bisector of the wrap angle of the guide roller or the guide rollers.
  • At least one deflection roller 13 of the S-roller pair 12 is equipped with a brake drive.
  • the S-roller section can be equipped with drives for train construction and train dismantling.
  • the S-roller pairs 12 are arranged below the belt running plane 20-20 and the eccentric bearing units 17, 18 of the upper and lower deflection rollers 13, 14 of the S-roller pairs 12 are located in a vertical plane 21-21.
  • the rotation axes 15, 16 of the guide rollers 13, 14 of the two S-roller pairs 12 are rotated about the vertical plane 21-21 of the eccentric bearing units 17, 18 of the guide rollers in a maximum distance from each other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Description

Die Erfindung betrifft ein Walzwerk sowie ein Verfahren zum flexiblen Kalt- oder Warm- Einweg- oder Reversierwalzen von Metallband, insbesondere aus Stahl, mit veränderlicher Banddicke, mit einem Walzgerüst, das einen Walzensatz und ein Anstellsystem zur Einstellung des Walzspaltes aufweist, einer dem Walzgerüst vorgeordneten Abhaspel und einer dem Walzgerüst nachgeordneten Aufhaspel für das Walzband, die mit einem drehzahlgeregelten Antrieb ausgerüstet sind.The invention relates to a rolling mill and to a method for flexible cold or warm disposable or reversing rolling of metal strip, in particular of steel, with variable strip thickness, with a roll stand having a set of rolls and a Anstellsystem for adjusting the roll gap, one of the rolling mill upstream Uncoiler and a rolling mill downstream reel for the rolled strip, which are equipped with a variable speed drive.

Die beim flexiblen Walzen in Bandlängsrichtung verlaufende Dickenänderung führt aufgrund der Massenflussgesetze zu Geschwindigkeitsänderungen des Walzbandes. Dies hat zur Folge, dass bei einer Verringerung des Walzspaltes und damit der Banddicke am Bandauslauf des Walzgerüstes eine Erhöhung der Bandgeschwindigkeit und am Bandeinlauf des Walzgerüstes eine Verringerung der Bandgeschwindigkeit auftritt. Analog dazu tritt beim Auffahren des Walzspaltes ein umgekehrtes Geschwindigkeitsverhalten des Walzbandes auf. Werden Bandlängsprofile mit steilen Dickenrampen und hohen Walzgeschwindigkeiten gewalzt, ist nicht selten die Regelung der Bandhaspel mit der Geschwindigkeitsanpassung überfordert. Infolgedessen kommt es zu Bandzugänderungen, die zum einen die Walzbedingungen und damit die Profilgenauigkeit und zum anderen die Wickelgüte des Bandcoils auf den Bandhaspeln erheblich beeinträchtigen und gegebenenfalls sogar zu Bandrissen führen können.The change in thickness running in the longitudinal direction of the flexible rolling results in changes in the speed of the rolled strip due to the mass flow laws. This has the consequence that with a reduction of the roll gap and thus the strip thickness at the strip outlet of the roll stand, an increase of the strip speed and at the strip inlet of the roll stand, a reduction of the strip speed occurs. Similarly, occurs when driving up the nip an inverse speed behavior of the rolled strip. If strip longitudinal profiles are rolled with steep thickness ramps and high rolling speeds, it is not uncommon to regulate the band reel with the speed adjustment. As a result, it comes to Bandzugänderungen, on the one hand significantly affect the rolling conditions and thus the profile accuracy and on the other hand, the winding quality of the band coil on the tape reels and possibly even can lead to tape breaks.

Die EP 1 121 990 A2 beschreibt ein Walzwerk zum flexiblen Walzen von Bandmaterial mit einer periodisch veränderlichen Banddicke. Zwischen der Abhaspel und dem Walzgerüst sowie der Aufhapsel und dem Walzgerüst ist jeweils eine Ausgleichsbeziehungsweise Tänzerrolle angeordnet, um die das Bandmaterial schleifenförmig herumgeführt ist. Die Position der Tänzerrolle zur horizontalen Bandlaufebene wird kraftgeregelt, um einen sich ändernde Materialfluss beziehungsweise eine sich ändernde Bandgeschwindigkeit aufgrund eines sich ändernden Materialstaus am Walzspalteingang und einer sich ändernden Materialvoreilung am Walzspaltausgang bei einer Verstellung des Walzspaltes auszugleichen und einen konstanten Bandzug einzustellen. Die Positionsveränderungen der Tänzerrollen infolge der Gleichgewichtsstörungen zwischen dem Bandabzug von der Abhaspel und dem Bandeinzug in den Walzspalt und/oder zwischen dem Bandaustritt aus dem Walzspalt und dem Aufwickeln des Bandes auf die Aufhaspel werden laufend ermittelt und in Signale zur Drehzahlregelung der Ab- und der Aufhaspel umgesetzt. Zur Verbesserung der Bandzugkonstanz wird die Periodizität der Banddickenänderung ermittelt und zur Kompensation der auf die Tänzerrollen einwirkenden Beschleunigungskräfte wird eine ' Störgröße aufgeschaltet.The EP 1 121 990 A2 describes a rolling mill for flexible rolling of strip material with a periodically varying strip thickness. Between the uncoiler and the roll stand and the hanger and the roll stand a Ausgleichsbeziehungsweise dancer roll is arranged, around which the strip material is looped around. The position of the dancer roller to the horizontal belt plane is force-controlled to compensate for a changing material flow or a changing belt speed due to a changing material jam at the roll nip input and a changing material lead at the nip exit with an adjustment of the roll gap and set a constant strip tension. The position changes of the dancer rollers due to the balance problems between the tape take-off from the uncoiler and the tape feeder in the nip and / or between the tape exit from the nip and the winding of the tape on the reel are continuously determined and in signals for speed control of the uncoiler and the coiler implemented. In order to improve the strip tension constancy, the periodicity of the strip thickness change is determined, and a disturbance variable is applied to compensate for the acceleration forces acting on the dancer rollers.

Zur Lösung der beim flexiblen Walzen von Bandmaterial bei einer Änderung des Banddickenverlaufs und größeren Bandgeschwindigkeiten auftretenden Probleme bezüglich des Massenflusses und des Bandzuges wird mit der DE 101 33 756 A1 ein Kaltwalzwerk mit einem Einzelgerüst, einer diesem vorgeordneten Abhaspel und einer diesem nachgeordneten Aufhaspel für das Bandmaterial sowie einem zwischen der Abhaspel und dem Walzgerüst angeordneten Bandspeicher für eine Massenflussregelung und eine Bandzugregelung beim Walzprozess vorgeschlagen. Der Bandspeicher wird durch eine Tänzerrolle gebildet, die gegenüber dem Walzband in einem bestimmten Winkel anstellbar ist und mit einer bestimmten Kraft beaufschlagbar ist, so dass sich eine Schlinge im Band bildet, deren Schlingenlänge sich mit der Position der Tänzerrolle ändert, so dass unterschiedliche Bandlängen gespeichert werden können.To solve the problems occurring in the flexible rolling of strip material with a change in the strip thickness profile and higher belt speeds with respect to the mass flow and the strip tension is with the DE 101 33 756 A1 a cold rolling mill with a single stand, this upstream reel and a downstream reel for the strip material and a arranged between the reel and the rolling mill strip accumulator proposed for a mass flow control and a Bandzugregelung during the rolling process. The tape storage is by a dancer roll formed, which is adjustable against the rolled strip at a certain angle and can be acted upon by a certain force, so that a loop forms in the band, the loop length changes with the position of the dancer roll, so that different lengths of tape can be stored.

Aus der DE 103 10 399 A1 ist ein Walzwerk zum flexiblen Walzen von Metallbändern bekannt, bei dem der auf dem Metallband lastende Bandzug mittels einer Bandzugausgleichsvorrichtung geregelt wird. Die Bandzugausgleichsvorrichtung wird durch eine Umlenkrolle gebildet, die zur Veränderung des Abstandes zwischen den Bandhaspeln und dem Walzspalt verschiebbar oder verschwenkbar ist. Durch die Verstellung der Umlenkrolle wird die Bandlaufgeometrie an die sich jeweils zwischen der Haspel und dem Walzgerüst befindlichen Bandlänge angepasst und damit der gewünschte Bandzug aufrechterhalten.From the DE 103 10 399 A1 For example, a rolling mill for flexible rolling of metal strips is known in which the strip tensioning on the metal strip is regulated by means of a strip tension compensation device. The tape tension compensation device is formed by a deflection roller which is displaceable or pivotable for changing the distance between the tape reels and the nip. By adjusting the deflection roller, the strip running geometry is adapted to the strip length located in each case between the reel and the rolling stand and thus the desired strip tension is maintained.

Bei dem aus der EP 1 464 415 A2 bekannten Walzwerk zum flexiblen Walzen von Metallband werden zur Regelung des Bandzuges Bandspeicher eingesetzt, die als S-Rollenpaare ausgebildet sind, deren eine Umlenkrolle zu der anderen Rolle zur Einstellung unterschiedlicher Schlaufenlängen des um die beiden Rollen geführten Walzbandes verstellbar ist, wobei zur Einstellung der effektiv auf den gewickelten Bund wirkenden Bandzüge die bekannte Funktion der Zugsteigerung und Zugreduzierung einer S-Rollenanordnung zur Anwendung gelangt.In the from the EP 1 464 415 A2 known rolling mill for flexible rolling of metal strip are used to control the tape tension band memory, which are designed as S-pairs of rollers whose deflection roller is adjustable to the other role for setting different loop lengths of the guided around the two rolls rolled strip, wherein for setting the effective on the band wound coils acting the known function of Zugsteigerung and Zugreduzierung an S-roller assembly comes to the application.

Bei dem Walzwerk gemäß der DE 10 2004 041 321 A1 zum flexiblen Walzen von Metallband wird ebenfalls eine S-Rolleneinheit als Bandspeicher eingesetzt, die zur Bandzugregelung mit einer schwenkbaren Umlenkrolle mit einem hydraulischen Linearstellglied ausgerüstet ist, wobei mindestens eine der beiden Umlenkrollen drehangetrieben ist, um den Zugaufbau im Band optimal beeinflussen zu können.In the rolling mill according to the DE 10 2004 041 321 A1 for flexible rolling of metal strip also an S-roll unit is used as a tape storage, which is equipped for Bandzugregelung with a pivoting pulley with a hydraulic linear actuator, wherein at least one of the two pulleys is rotationally driven in order to optimally influence the tensile structure in the band.

Mit der DE 102 54 178 A1 werden ein Verfahren zur Ermittlung von Zustandsgrößen eines Walzprozesses und die daraus abgeleiteten Regelungsverfahren beschrieben. Durch die dort zum Beispiel erläuterte hochdynamische Analyse nach der Massenflusskonstanz werden Bandzugabweichungen während des Walzprozesses vom Sollwert vor allem in den Beschleunigungs- und Abbremsphasen verhindert.With the DE 102 54 178 A1 A method for determining state variables of a rolling process and the control methods derived therefrom are described. The highly dynamic analysis according to the mass flow constancy explained there, for example, prevents strip tension deviations during the rolling process from the setpoint, especially in the acceleration and deceleration phases.

Die verschiedenen Bandspeicherkonstruktionen der vorbeschriebenen Walzwerke zum Ausgleich der beim flexiblen Walzen von Bandmaterial auftretenden Massenflussänderungen beziehungsweise Bandlängenunterschiede verfolgen den Zweck, die auf den Walzspalt rückwirkenden Bandzüge konstant zu halten. Dies ist jedoch nur dann möglich, wenn die zum Beispiel durch die gewünschten Längen der dünnen Profilstellen durch den Massenfluss bedingten Längendifferenzen innerhalb der Stellwege der Ausgleichsglieder liegen. Zum anderen ergeben sich weitere Störgrößen durch das Beschleunigungsvermögen der Antriebe der Ausgleichsstellglieder infolge ihrer eigenen Massenträgheitsmomente.The various strip storage designs of the above-described rolling mills to compensate for the occurring during flexible rolling of strip material mass flow changes or band length differences pursue the purpose of keeping the roll gap on the roll gap constant. However, this is only possible if, for example, due to the desired lengths of the thin profile points due to the mass flow length differences lie within the travel paths of the compensating members. On the other hand, further disturbing variables result from the acceleration capacity of the drives of the compensation actuators as a result of their own mass moments of inertia.

Der Erfindung liegt die Aufgabe zugrunde, ein Walzwerk sowie ein Verfahren zum flexiblen Walzen von Metallband zu entwickeln, die gegenüber den Walzwerken und den Walzverfahren nach dem Stand der Technik zum flexiblen Walzen von Bandmaterial höhere Walzgeschwindigkeiten unter Beachtung der physikalischen Grenzbedingungen wie Bandspeicherlänge, Massenträgheiten der Stellglieder und Bandzugfehler durch Abweichung von der idealen Beschleunigungscharakteristik, insbesondere in den Umkehrpunkten der Bandbeschleunigung bei einer Änderung des Banddickenprofils, und durch die Vermeidung von abrupt gegenläufigen Massenbeschleunigungen der Bandspeichereinrichtungen ermöglichen.The invention has for its object to develop a rolling mill and a method for flexible rolling of metal strip, compared to the rolling mills and rolling processes of the prior art for flexible rolling of strip material higher rolling speeds, taking into account the physical boundary conditions such as tape storage length, inertias of the actuators and band tension error due to deviation from the ideal acceleration characteristic, in particular in the reversal points of the band acceleration when the band thickness profile changes, and by avoiding abruptly opposite mass accelerations of the tape storage devices.

Diese Aufgabe wird durch die Walzwerke mit den Merkmalen der Patentansprüche 1 und 3 sowie das Walzverfahren gemäß Patentanspruch 17 gelöst.This object is achieved by the rolling mills with the features of claims 1 and 3 and the rolling method according to claim 17.

Die Erfindung wird nachfolgend anhand von zwei in den Figuren 1 und 2 schematisch dargestellten Walzwerkkonstruktionen erläutert.The invention is described below with reference to two in the FIGS. 1 and 2 illustrated schematically rolling mill designs.

Figur 1 zeigt den schematischen Aufbau eines Quartowalzwerkes zum flexiblen Kalt-Einwegwalzen von Metallband mit veränderlicher Banddicke. Das Walzwerk umfasst ein Walzgerüst 1, in das zwei Arbeitswalzen 2, 3 und zwei Stützwalzen 4, 5 sowie ein Anstellsystem zur Einstellung des Walzspaltes 6 eingebaut sind, eine dem Walzgerüst 1 vorgeordnete Abhaspel 7 und eine dem Walzgerüst nachgeordnete Aufhaspel 8 für das Walzband 9. FIG. 1 shows the schematic structure of a 4-high mill for flexible cold-disposable rolling of metal strip with variable strip thickness. The rolling mill comprises a roll stand 1, in which two work rolls 2, 3 and two support rolls 4, 5 and a setting system for adjusting the roll gap 6 are installed, a roll stand 1 upstream reel 7 and a roll stand downstream reel 8 for the rolled strip. 9

Zur Kompensation beziehungsweise Regelung der beim flexiblen Walzen auftretenden Massenflussänderungen des Walzbandes 9 und der von diesen abhängigen Bandgeschwindigkeit sowie zur Regelung des Bandzuges insbesondere im Bereich der Umkehrpunkte der Bandbeschleunigung bei einer Änderung des Banddickenprofils wird eine Drehzahlregelung der Antriebe von Ab- und Aufwickelhaspel 7, 8 mit überlagerter Leitwertregelung eingesetzt.To compensate or control the occurring during flexible rolling mass flow changes of the rolled strip 9 and the dependent of these belt speed and to control the strip tension, in particular in the range of reversal points of the belt acceleration with a change in the strip thickness profile is a speed control of the drives of unwinding and Aufwickelhaspel 7, 8 with superimposed conductance control used.

In die Regelung der Haspelantriebe wird der Dickenprofil-Leitrechner zur Ermittlung der Sollwerte für die Walzspaltanstellung zur flexibeln Einstellung der Banddicke einbezogen, wobei der Leitrechner für die Regelung des Banddickenprofils den Banddickenverlauf zusätzlich als Funktion der Zeit an einen Materialflussprädiktor weitergibt, der unter Berücksichtigung des Materialrückstaus an der Bandeinlaufseite und der Materialvoreilung an der Bandauslaufseite des Walzgerüstes sowie in Kenntnis der antriebsspezifischen Momentenregelzeiten eine vorgesteuerte Momentenaufschaltung für die Drehzahlregelung von Abhaspel und Aufhaspel erzeugt. Diese Momentenvorsteuerung kann in Abhängigkeit vom Dickenübergang dick-dünn oder dünn-dick sowie von der Walzrichtung positiv oder negativ sein. Der gesamte Walzprozess erfolgt längensegment- und/oder zeitsegmentgesteuert.In the regulation of the reel drives of the thickness profile control computer for determining the setpoints for the nip position for flexible adjustment of the strip thickness is included, the host computer for the regulation of Banddickenprofils the strip thickness course additionally passes as a function of time to a Materialflussprädiktor that generates a pilot-controlled torque application for the speed control of uncoiler and reel, taking into account the material backlog at the tape inlet side and the material advance on the strip outlet side of the rolling stand and in knowledge of the drive-specific torque control times. This torque precontrol can be positive or negative depending on the thickness transition thick-thin or thin-thick and of the rolling direction. The entire rolling process is carried out with a length segment and / or time segment control.

In einer weiteren Ausführungsform ist das in Figur 2 dargestellte Walzwerk mit einem zwischen der Abhaspel 7 und dem Walzgerüst 1 angeordneten Bandspeicher 10 sowie einem weiteren zwischen dem Walzgerüst 1 und der Aufhaspel 8 angeordneten Bandspeicher 11 ausgerüstet. Die Bandspeicher 10, 11 dienen zur Kompensation verbleibender Restfehler im Massenfluss des Walzbandes aufgrund der beschränkten Antriebsdynamik der Haspelantriebe im Bereich der Umkehrpunkte der Bandbeschleunigung bei einer Änderung des Banddickenprofils. Die Bandspeicher 10, 11 sind jeweils als ein S-Rollenpaar 12 ausgebildet mit einer oberen und einer unteren Umlenkrolle 13, 14, einer exzentrischen Lagerung der Rotationsachsen 15, 16 der oberen und der unteren Umlenkrolle 13, 14 in Lagereinheiten 17, 18 sowie einer veränderlichen Einstellung der gegenseitigen Position der Rotationsachsen 15, 16 der beiden Umlenkrollen 15, 16 durch eine Drehverstellung einer oder beider Rotationsachsen 15, 16 um die Lagereinheiten 17, 18 mittels eines Drehantriebs zur Einstellung unterschiedlicher Schlaufenlängen des in einer Schlaufe 19 um die beiden Umlenkrollen 13, 14 des S-Rollenpaares 12 geführten Walzbandes 9. Die unterschiedlichen Schlaufenlängen werden im Zusammenspiel mit der Exzenterverstellung als schneller Bandspeicher zum Auffangen verbleibender Abweichungen von der Sollbeschleunigung verwendet. Die Exzenterverstellung hat gegenüber den bekannten Bandspeichern den Vorteil, dass die Verstellung vergleichsweise schnell erfolgen kann, da keine großen Massen mit entsprechender Massenträgheit über einen großen Weg beschleunigt werden müssen.In a further embodiment, the in FIG. 2 shown rolling mill equipped with a arranged between the pay-off reel 7 and the roll stand 1 tape storage 10 and another arranged between the roll stand 1 and the reel 8 tape storage 11. The band memories 10, 11 are used to compensate for remaining residual errors in the mass flow of the rolled strip due to the limited drive dynamics of the reel drives in the area of the reversal points of the belt acceleration with a change in the strip thickness profile. The tape storage 10, 11 are each formed as an S-pair of rollers 12 having an upper and a lower guide roller 13, 14, an eccentric mounting of the axes of rotation 15, 16 of the upper and lower guide rollers 13, 14 in bearing units 17, 18 and a variable Adjustment of the mutual position of the axes of rotation 15, 16 of the two guide rollers 15, 16 by a rotational adjustment of one or both axes of rotation 15, 16 about the bearing units 17, 18 by means of a rotary drive for setting different loop lengths of in a loop 19 around the two guide rollers 13, 14th rolled strip 9 guided by the S-roller pair 12. The different loop lengths are used in conjunction with the eccentric adjustment Fast tape storage used to catch remaining deviations from the target acceleration. The eccentric adjustment has the advantage over the known tape stores that the adjustment can be made comparatively quickly, since no large masses with corresponding inertia have to be accelerated over a large distance.

Die Exzenterverstellung der Rotationsachsen der Umlenkrollen des S-Rollenpaares kann sowohl vorgesteuert durch den Materialflussprädiktor als auch geregelt durch den gemessenen Bandzug erfolgen.The eccentric adjustment of the axes of rotation of the pulleys of the S-roller pair can be carried out both pilot-controlled by the Materialflussprädiktor as well as regulated by the measured strip tension.

Beim flexiblen Walzen von Metallband treten bei Banddickenänderungen die sogenannten Änderungspunkte oder Umkehrpunkte in der Beschleunigungscharakteristik auf. Hier ist in der Praxis zum Beispiel aufgrund limitierter Stromanstiegsgeschwindigkeiten der Antriebsregelung eine Abweichung des realen Beschleunigungsverlaufs von der idealen Beschleunigungscharakteristik festzustellen, wobei sich positive und negative Beschleunigungsfehler ergeben können. Diese Beschleunigungsfehler können auf der Grundlage der Antriebsparameter wie zum Beispiel Anregelzeiten sowie unter Ermittlung weiterer Zustandsgrößen des Walzwerks wie Banddickenreduktion, Materialvoreilung und Materialrückstau, Walzgeschwindigkeit und so weiter zunächst in einen Geschwindigkeitsfehler als Integral des Beschleunigungsfehlers und dann über die Proportionalitätsbeziehung in einen Längenfehler umgerechnet werden. Dem ermittelten Längenfehler entsprechend werden die exzentrischen Lagereinheiten der Rotationsachsen der Umlenkrollen des S-Rollenpaares verstellt, so dass der Längenfehler kompensiert und ein konstanter Bandzug erreicht wird.When flexible rolling of metal strip occur in band thickness changes, the so-called change points or reversal points in the acceleration characteristic. Here, in practice, for example, due to limited current increase speeds of the drive control, a deviation of the real acceleration curve from the ideal acceleration characteristic can be established, whereby positive and negative acceleration errors can result. These acceleration errors can first be converted into a velocity error as the integral of the acceleration error and then through the proportional relationship into a length error on the basis of the drive parameters such as ramp times and determination of further rolling process variables such as strip thickness reduction, material advance and material backlog, rolling speed and so on. The determined length error corresponding to the eccentric bearing units of the axes of rotation of the pulleys of the S-roller pair are adjusted so that the length error compensated and a constant strip tension is achieved.

In weiteren Ausführungsformen kann das Walzverfahren auch durch Rückführung von Prozessmesswerten wie zum Beispiel Bandzug und/oder Exzenterverstellkraft gegenüber der rechnerischen Ermittlung von Zustandsgrößen erweitert werden.In further embodiments, the rolling process can also be extended by returning process measured values, such as, for example, strip tension and / or eccentric adjustment force, as opposed to the calculated determination of state variables.

Es besteht die Möglichkeit, das Walzwerk um eine offlineplanheitsoptimierte Betriebsweise mit reduziertem Aufhaspelzug zu erweitern.It is possible to extend the rolling mill by a planarity optimized operation with reduced Aufhaspelzug.

Der Drehwinkel der Exzenterverstellung der Rotationsachse 15 mindestens einer Umlenkrolle 13 des S-Rollenpaares 12 wird aus der Exzenterausgangsstellung und in Abhängigkeit des Bandgeschwindigkeitsfehlers aus der Beschleunigungsabweichung bestimmt.The angle of rotation of the eccentric adjustment of the axis of rotation 15 of at least one deflection roller 13 of the S-roller pair 12 is determined from the Exzenterausgangsstellung and as a function of the belt speed error from the acceleration deviation.

Die Winkelgeschwindigkeit der Exzenterverstellung der Rotationsachse 15 mindestens einer Umlenkrolle 13 des S-Rollenpaares 12 wird aus der Exzenterausgangsstellung und in Abhängigkeit des Bandgeschwindigkeitsfehlers aus der Beschleunigungsabweichung bestimmt.The angular velocity of the eccentric adjustment of the axis of rotation 15 of at least one deflection roller 13 of the S-roller pair 12 is determined from the Exzenterausgangsstellung and as a function of the belt speed error from the acceleration deviation.

Ferner können der Drehwinkel und die Winkelgeschwindigkeit der Exzenterverstellung der Rotationsachse 15 mindestens einer Umlenkrolle 13 des S-Rollenpaares 12 aus der Exzenterausgangsstellung und in Abhängigkeit des Bandgeschwindigkeitsfehlers aus der Beschleunigungsabweichung bestimmt werden.Furthermore, the angle of rotation and the angular speed of the eccentric adjustment of the axis of rotation 15 of at least one deflection roller 13 of the S-roller pair 12 can be determined from the eccentric output position and depending on the belt speed error from the acceleration deviation.

Die Totpunkte der Exzenterverstellung der Rotationsachse 15 mindestens einer Umlenkrolle 13 des S-Rollenpaares 12 sind annähernd auf der Winkelhalbierenden des Umschlingungswinkels der Umlenkrolle beziehungsweise der Umlenkrollen angeordnet.The dead centers of the eccentric adjustment of the rotational axis 15 of at least one deflection roller 13 of the S-roller pair 12 are arranged approximately on the bisector of the wrap angle of the guide roller or the guide rollers.

Zusätzlich zu dem Drehantrieb ist mindestens eine Umlenkrolle 13 des S-Rollenpaares 12 mit einem Bremsantrieb ausgerüstet.In addition to the rotary drive, at least one deflection roller 13 of the S-roller pair 12 is equipped with a brake drive.

Werden insbesondere hohe prozessbedingte Bandzüge benötigt oder soll zur Vermeidung von Oberflächenbeschädigungen und Nachverformungen des zu einem Bund aufgewickelten Walzbandes der Wickelbandzug reduziert werden, kann die S-Rollenstrecke zum Zugaufbau und Zugabbau mit Antrieben ausgestattet werden.If, in particular, high process-related strip tension is required or if the wrapping strip tension is to be reduced in order to avoid damage to the surface and subsequent deformation of the rolled strip wound up into a bundle, the S-roller section can be equipped with drives for train construction and train dismantling.

Die S-Rollenpaare 12 sind unterhalb der Bandlaufebene 20-20 angeordnet und die exzentrischen Lagereinheiten 17, 18 der oberen und der unteren Umlenkrolle 13, 14 der S-Rollenpaare 12 befinden sich in einer Vertikalebene 21-21.The S-roller pairs 12 are arranged below the belt running plane 20-20 and the eccentric bearing units 17, 18 of the upper and lower deflection rollers 13, 14 of the S-roller pairs 12 are located in a vertical plane 21-21.

Ferner besteht die Möglichkeit einer Anordnung der beiden S-Rollenpaare 12 unterhalb der Bandlaufebene 20-20 und einer Anordnung der exzentrischen Lagereinheiten 17, 18 der oberen und der unteren Umlenkrolle 13, 14 der S-Rollenpaare 12 in einer Ebene, die unter einem Winkel von +90° bis -90° zur Vertikalen verläuft.Furthermore, there is the possibility of an arrangement of the two pairs of S-rollers 12 below the strip running plane 20-20 and an arrangement of the eccentric bearing units 17, 18 of the upper and lower guide rollers 13, 14 of the S-roller pairs 12 in a plane which is at an angle of + 90 ° to -90 ° to the vertical.

Des weiteren besteht die Möglichkeit, die S-Rollenpaare 12 oberhalb der Bandlaufebene 20-20 anzuordnen und die exzentrischen Lagereinheiten 17, 18 der oberen und der unteren Umlenkrolle 13, 14 der S-Rollenpaare in einer Vertikalebene anzuordnen.Furthermore, it is possible to arrange the S-roller pairs 12 above the belt running plane 20-20 and to arrange the eccentric bearing units 17, 18 of the upper and lower deflection rollers 13, 14 of the S-roller pairs in a vertical plane.

Schließlich besteht die Möglichkeit einer Anordnung der S-Rollenpaare 12 oberhalb der Bandlaufebene 20-20 und einer Anordnung der exzentrischen Lagereinheiten 17, 18 der oberen und der unteren Umlenkrolle 13, 14 der S-Rollenpaare 12 in einer Ebene, die unter einem Winkel von +90° bis -90° zur Vertikalen verläuft.Finally, there is the possibility of arranging the S-roller pairs 12 above the strip running plane 20-20 and an arrangement of the eccentric bearing units 17, 18 of the upper and lower guide rollers 13, 14 of the S-roller pairs 12 in one Plane that extends at an angle of + 90 ° to -90 ° to the vertical.

Zur Erleichterung der Einführung des Walzbandes 9 werden die Rotationsachsen 15, 16 der Umlenkrollen 13, 14 der beiden S-Rollenpaare 12 um die Vertikalebene 21-21 der exzentrischen Lagereinheiten 17, 18 der Umlenkrollen in einen größten Abstand zueinander gedreht.To facilitate the introduction of the rolled strip 9, the rotation axes 15, 16 of the guide rollers 13, 14 of the two S-roller pairs 12 are rotated about the vertical plane 21-21 of the eccentric bearing units 17, 18 of the guide rollers in a maximum distance from each other.

Bezugszeichenreference numeral

11
Walzgerüstrolling mill
22
ArbeitswalzeStripper
33
ArbeitswalzeStripper
44
Stützwalzesupporting roll
55
Stützwalzesupporting roll
66
Walzspaltnip
77
Abhaspeluncoiler
88th
Aufhaspelcoiler
99
Walzbandrolled strip
1010
Bandspeichertape storage
1111
Bandspeichertape storage
1212
S-RollenpaarS-roll pair
1313
obere Umlenkrolle von 12upper pulley of 12
1414
untere Umlenkrolle von 12lower pulley of 12
1515
Rotationsachse von 13Rotation axis of 13
1616
Rotationsachse von 14Rotation axis of 14
1717
exzentrische Lagereinheit von 15eccentric bearing unit of 15
1818
exzentrische Lagereinheit von 16eccentric bearing unit of 16
1919
Schlaufe von 9Loop of 9
20-2020-20
BandlaufebeneStrip level
21-2121-21
Vertikalebene von 17, 18Vertical plane of 17, 18

Claims (17)

  1. Rolling mill for flexible cold or hot, one-way or reverse rolling of metal strip (9), in particular made of steel, with changeable strip width, having a roll stand (1) which has a set of rolls (2, 3, 4, 5) and an adjustment system for adjustment of the roll gap, an uncoiler (7) which is disposed in front of the roll stand (1) and a coiler (8) which is disposed after the roll stand (1) for the metal strip (9), which are equipped with a speed-controlled drive, characterised by speed control of the drives of uncoiler and coiler (7, 8) with superimposed conduction control for compensation or control of the mass flow changes of the metal strip (9) and of the strip tension speed which is dependent thereon, and also for control of the strip tension, in particular in the region of the arrest points of the strip acceleration during a change of the strip thickness profile.
  2. Rolling mill according to claim 1, characterised by inclusion of the thickness profile conduction calculator in order to determine the reference values for the roll gap adjustment for flexible adjustment of the strip thickness in the control of the coiler drives, the conduction calculator for control of the strip thickness profile transmitting the strip thickness course in addition as a function of time to a material flow predictor which, taking into account the backward slip of the material at the strip inlet side and the material advance at the strip outlet side of the roll stand (1) and also, with knowledge of the drive-specific moment control times, produces a pilot moment switch-on for the speed control of uncoiler (7) and coiler (8).
  3. Rolling mill according to claim 1 and 2, characterised by being equipped with a rapid strip store (10, 11), which is disposed between uncoiler (7) and roll stand (1) and/or coiler (8) and roll stand (1) for compensation of the remaining residual errors in the mass flow of the metal strip (9) and in the strip tension due to the restricted drive dynamics of the coiler drives in the region of the arrest points of the strip acceleration during a change in the strip thickness profile, and also a configuration of the strip store or of the strip stores (10, 11) as an S-roller pair (12) with an upper and a lower deflection roller (13, 14), an eccentric mounting of the axes of rotation (15, 16) of the upper and/or lower deflection rollers (13, 14) in mounting units (17, 18) and also a changeable adjustment of the mutual position of the axes of rotation (15, 16) of the two deflection rollers (13, 14) by means of a rotational displacement of one or both axes of rotation (15, 16) about the mounting units (17, 18) by means of a rotational drive for adjustment of different loop lengths of the metal strip (9) which is guided in a loop (19) about the two deflection rollers (13, 14) of the S-roller pair (12).
  4. Rolling mill according to claim 3, characterised in that the eccentric displacement at least of one deflection roller (13, 14) of an S-roller pair or of both S-roller pairs (12) is piloted by the material flow predictor.
  5. Rolling mill according to claim 3, characterised in that the eccentric displacement at least of one deflection roller (13, 14) of an S-roller pair or of both S-roller pairs (12) is effected controlled by the measured strip tension.
  6. Rolling mill according to one of the claims 3 to 5, characterised in that the angle of rotation of the eccentric displacement of the axis of rotation (15) at least of one deflection roller (13) of the S-roller pair (12) is determined from the eccentric initial position and as a function of the strip speed error from the acceleration deviation.
  7. Rolling mill according to one of the claims 3 to 6, characterised in that the angular velocity of the eccentric displacement of the axis of rotation (15) at least of one deflection roller (13) of the S-roller pair (12) is determined from the eccentric initial position and as a function of the strip speed error from the acceleration deviation.
  8. Rolling mill according to one of the claims 3 to 6, characterised in that the angle of rotation and the rotational angular velocity of the eccentric displacement of the axis of rotation (15) at least of one deflection roller (13) of the S-roller pair (12) are determined from the eccentric initial position and as a function of the strip speed error from the acceleration deviation.
  9. Rolling mill according to one of the claims 3 to 8, characterised in that the dead points of the eccentric displacement of the axis of rotation (15) at least of one deflection roller (13) of the S-roller pair (12) are disposed approximately on the angular bisector of the loop angle of the deflection roller or of the deflection rollers.
  10. Rolling mill according to one of the claims 3 to 9, characterised by a deflection roller or both deflection rollers (13, 14) of the S-roller pair or of both S-roller pairs (12) being equipped with a brake drive.
  11. Rolling mill according to one of the claims 3 to 10, characterised by an arrangement of an S-roller pair or both S-roller pairs (12) below the strip running plane (20 - 20) and an arrangement of the eccentric mounting units. (17, 18) of the upper and of the lower deflection roller (13, 14) of the S-roller pair or of the S-roller pairs (12) in a vertical plane (21 - 21).
  12. Rolling mill according to one of the claims 3 to 10, characterised by an arrangement of an S-roller pair or of both S-roller pairs (12) below the strip running plane (20 - 20) and an arrangement of the eccentric mounting units (17, 18) of the upper and of the lower deflection roller (13, 14) of the S-roller pair or of the S-roller pairs (12) in a plane which extends at an angle of +90° to -90° to the vertical.
  13. Rolling mill according to one of the claims 3 to 10, characterised by an arrangement of an S-roller pair or of both S-roller pairs (12) above the strip running plane (20 - 20) and an arrangement of the eccentric mounting units (17, 18) of the upper and of the lower deflection roller (13, 14) of the S-roller pair or of the S-roller pairs (12) in a vertical plane (21 - 21).
  14. Rolling mill according to one of the claims 3 to 10, characterised by an arrangement of an S-roller pair or of both S-roller pairs (12) above the strip running plane (20 - 20) and an arrangement of the eccentric mounting units (17, 18) of the upper and of the lower deflection roller (13, 14) of the S-roller pair or of the S-roller pairs (12) in a plane which extends at an angle of +90° to -90° to the vertical.
  15. Rolling mill according to one of the claims 3 to 14, characterised by a rotation of the axes of rotation (15, 16) of the deflection rollers (13, 14) of an S-roller pair or of both S-roller pairs (12) about the vertical plane (21 - 21) of the eccentric mounting units (17, 18) of the deflection rollers (13, 14) at a maximum spacing relative to each other in order to facilitate introduction of the roll strip (9).
  16. Rolling mill according to one of the claims 3 to 15, characterised by an offline-flatness-orientated mode of operation with reduced coiler tension.
  17. Method for flexible cold or hot, one-way or reverse rolling of metal strip (9) with changeable strip width in a rolling mill (1) which has a set of rolls (2, 3, 4, 5) and an adjustment system for adjustment of the roll gap, an uncoiler (7) which is disposed in front of the roll stand (1) and a coiler (8) which is disposed after the roll stand (1) for the metal strip (9), which are equipped with a speed-controlled drive, characterised in that the mass flow changes of the metal strip (9) and the strip speed which is dependent thereon are compensated for by speed control of the strip coiler drives such that the strip tensions in the region of the arrest points of the strip acceleration during a change of the strip thickness profile remain constant, and in that remaining residual errors in the mass flow of the metal strip (9) and in the strip tension due to the restricted drive dynamics of the coiler drives in the region of the arrest points of the strip acceleration are compensated for by at least one strip store (10, 11), which is configured as an S-roller pair (12) with an eccentric rotational displacement at least of one deflection roller of the S-roller pair for adjustment of different loop lengths of the metal strip (9) which is guided in a loop (19) about the two deflection rollers (13, 14) of the S-roller pair (12).
EP20070018882 2006-10-07 2007-09-26 Rolling mill and method for flexible cold or hot one-way or reverse rolling of a metal strip Revoked EP1908534B1 (en)

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DE200610047463 DE102006047463A1 (en) 2006-10-07 2006-10-07 Rolling mill and method for flexible cold or hot one-way or reverse rolling of metal strip

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