EP0811435B1 - Presetting for a cold mill reversing stand - Google Patents

Presetting for a cold mill reversing stand Download PDF

Info

Publication number
EP0811435B1
EP0811435B1 EP97108853A EP97108853A EP0811435B1 EP 0811435 B1 EP0811435 B1 EP 0811435B1 EP 97108853 A EP97108853 A EP 97108853A EP 97108853 A EP97108853 A EP 97108853A EP 0811435 B1 EP0811435 B1 EP 0811435B1
Authority
EP
European Patent Office
Prior art keywords
data
strip
actuator position
coil
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97108853A
Other languages
German (de)
French (fr)
Other versions
EP0811435A2 (en
EP0811435A3 (en
Inventor
Eberhard Dr. Neuschütz
Gert Mücke
Roger Lathe
Frank Gorgels
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BETR FORSCH INST ANGEW FORSCH
BFI VDEH Institut fuer Angewandte Forschung GmbH
Original Assignee
BETR FORSCH INST ANGEW FORSCH
BFI VDEH Institut fuer Angewandte Forschung GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7796361&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0811435(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BETR FORSCH INST ANGEW FORSCH, BFI VDEH Institut fuer Angewandte Forschung GmbH filed Critical BETR FORSCH INST ANGEW FORSCH
Publication of EP0811435A2 publication Critical patent/EP0811435A2/en
Publication of EP0811435A3 publication Critical patent/EP0811435A3/en
Application granted granted Critical
Publication of EP0811435B1 publication Critical patent/EP0811435B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/36—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/22—Pass schedule
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position

Definitions

  • the invention relates to a method for presetting the actuator positions of the band flatness at one Reversing stand or a rolling mill for the first Stitch of a new coil during cold rolling of strips especially made of stainless steel. It also affects one Procedure for presetting the controlled actuator positions the band flatness in a reversing stand or a rolling mill for restarting after one Standstill, for example with a new stitch or a roll change.
  • German patent application 44 21 005 describes a device for controlling the rolling, especially the cold rolling of stainless steel, in which Forming and plant technology restrictions for Rolling measurements outgoing design of a smooth operation and a flawless Rolled goods must be observed.
  • the roller system In With regard to a specific tape to be exercised Force set.
  • the actuator positions opposed to the roller system with regard to a certain geometry of the roll gap is set.
  • the default size depends on the tape dimensions given at the start of the stitch, i.e. the strip thickness and width, the respective material and the cross-sectional decrease.
  • the default of Reversing stand or the rolling train through the waltz can deviate significantly from operational requirements.
  • With the same rolling program are considerable individual differences when setting the Rolling parameters in the initial phase of a roll pass possible. The reason for this lies in one Overtaxing the helmsman as a result of the large number the control measures to be carried out, as well as in a different individual assessment of the Rolling events. It is therefore unavoidable that beginning and end of the band in their geometric Properties, mainly the strip thickness and flatness, from the stationary rolled middle section of the strip distinguish and therefore go to the scrap.
  • the invention is based on the problem, both the Presetting the for a new coil as well as for a cold rolled coil - after a roll stop before the next stitch or when changing the roller Automate actuator positions of the band flatness.
  • the band flatness preset of the respective roll stand for the first pass of a new one Coils even without knowledge of the existing one at the start of the stitch Strip or thickness profile of the hot strip may be possible.
  • the solution for a current coil is that according to the invention as actuator positions for the strip flatness the corresponding actual data of the first stitch a reference coil selected from n coils previously rolled are used, whose reference data, namely the scaffold setting, band flatness and coil data, the best match with the target data of the current Coils and that one each from the data of the individual actual reference state plus one of the Difference between the data of the reference state and the Target state dependent actuator change formed Actuator position is used.
  • n 1,2, ...
  • the current coil is based on that historical record rolled, the largest Flatness similarity to the target state.
  • the solution is that the actuator position for the Strip flatness based on the corresponding actual data, that existed immediately before the standstill and that each one from the data of the individual Actual reference state plus one of the difference the data of the reference state and the target state dependent actuator change formed Actuator position is used. This allows the resulting inevitably with each stitch Strain hardening of the strip to be taken into account has the same effect as if another material was rolled would.
  • the actuators for the strip flatness are automatically preset.
  • a reference state with actual data from one or from the previous one Process For this, n previously rolled coils are considered and the coil used for comparison, whose Reference data the target data of the current coil on come next.
  • process data of the reference coil For the band flatness, for example: Rolling force, strip tension, inlet and outlet thickness, position of the Flatness actuators and roller geometry.
  • the knowledge of the thickness profile of the current Coils not required.
  • the roll gap can be also adjust an unknown band profile. Which is very advantageous because the strip should do that during cold rolling Keep the profile it had from hot rolling; a Profile change during cold rolling would cause waves in the strip to lead. If the strip thickness profile is known, it can however also when determining the actuator positions be taken into account.
  • the invention relates to an automatic system for the unsteady rolling phase both with a new coil and even after a standstill.
  • the invention can be used as reference data for the first stitch of a new coils, the actual data from the start of the last n rolled coils from a category Data collection can be taken.
  • the categories are for example: quality, bandwidth and strip thickness.
  • the scaffold adjustment, band flatness and material data the best match with the Target state of the new coil. This gives also an automatic adaptation of changes that during long rolling operations, for example Long-term change in the hot strip thickness profile to adjust.
  • the invention further relates to a method for Presetting the strip thickness for a reversing stand or a rolling mill for a new coil or the next stitch of a rolled coil at each Cold rolling of strips, in particular made of stainless steel.
  • the the underlying problem is that at every stitch start required actuator positions of the strip thickness automate.
  • the roll stand should start at the start of the stitch are automatically set to a roll thickness that is maintained exactly during the steady state.
  • the strip thickness presetting of the respective roll stand for the first pass of a new one Coils even without knowledge of the existing one at the start of the stitch Strip or thickness profile of the hot strip may be possible.
  • the solution is to preset the strip thickness preferred in the context of the invention in that the strip thickness by specifying one over a period of time from the actual data of reference states of the respective Roll stand adapted rolling force or position is preset.
  • the tape thickness is preferred over the default a predetermined rolling force or the default preset a predetermined position.
  • the flow curves should be used to determine the default data over a certain previous period from the current process data for the respective roll stand be adapted. This ensures that too practical with an as yet unknown thickness profile of the tape immediately at the start of the stitch, the tape thickness which is also set in the stationary area is rolled. Because of the automatic fall time consuming Start-up processes are gone, process disruptions such as belt breaks practically excluded.
  • Table 1 shows the reference state for the various Events, namely for rolling a new one Coils or for restarting after a standstill of the mill stand.
  • Actual data from the start of the stitch of a coil are the same Category, for example quality, bandwidth and Strip thickness, that from the last n rolled coils was selected.
  • after a standstill e.g. with every new stitch or when changing the reel serve as reference data the actual data that immediately accumulated on the same coil prior to standstill.
  • the reference state determined in this way (the individual values or value examples are given in Table 1) together with the target state (also here are the individual data given in Table 1) one Arithmetic algorithm fed to the actuator positions for the flatness of the tape.
  • the actuator positions according to the invention determined that itself from the actuator position of the reference state plus the calculated actuator change. According to Table 2, the calculation is carried out on-line at Use of a roll gap model. The calculation of the new actuator positions are to be carried out iteratively. The If necessary, the iteration is ended when the Difference in actuator positions for the current iteration step to the actuator positions of the previous one Step a certain, predetermined Limit falls below This limit is oriented the position accuracy of the actuator.
  • Table 4 illustrates an implementation scheme of the Method for determining the rolling force to be specified or position to achieve the desired Target outlet thickness taking into account a reference condition.
  • the target state is defined by: the Inlet thickness of the strip, the target outlet thickness and the Belt tension.
  • the values of the Reference state - preferably online - via a Influence function depending on the measured values of the Reference state, e.g. rolling force / position, Corrected inlet thickness, outlet thickness and belt tension.
  • the result is the rolling force to be specified or position with which the belt with each new Stitch, even at the first stitch, is rolled automatically.

Landscapes

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

Description

Die Erfindung betrifft ein Verfahren zum Voreinstellen der Stellgliedpositionen der Bandplanheit bei einem Reversiergerüst oder einer Walzstraße für den ersten Stich eines neuen Coils beim Kaltwalzen von Bändern insbesondere aus Edelstahl. Sie betrifft ferner ein Verfahren zum Voreinstellen der geregelten Stellgliedpositionen der Bandplanheit bei einem Reversiergerüst oder einer Walzstraße für das Wiederanfahren nach einem Stillstand, beispielsweise bei einem neuen Stich oder einem Walzenwechsel.The invention relates to a method for presetting the actuator positions of the band flatness at one Reversing stand or a rolling mill for the first Stitch of a new coil during cold rolling of strips especially made of stainless steel. It also affects one Procedure for presetting the controlled actuator positions the band flatness in a reversing stand or a rolling mill for restarting after one Standstill, for example with a new stitch or a roll change.

Beim Kaltwalzen von Bändern, speziell Edelstahlbändern, treten bei ungeeigneter Einstellung der Walzspaltkontur in dem gewalzten Band Längenunterschiede - sogenannte Planheitsfehler - auf. Wird mit Längszug gewalzt, so führen diese Längenunterschiede zu einer ungleichmäßigen Zugspannungsverteilung über die Bandbreite. Die Längen- bzw. Zugspannungsdifferenzen können sehr unterschiedlich sein. When cold rolling strips, especially stainless steel strips, occur when the roll gap contour is unsuitable in the rolled strip length differences - so-called Flatness error - on. Is rolled with longitudinal tension, so these differences in length lead to an uneven Tension distribution over the bandwidth. The lengths- or tension differences can be very different his.

Zur Beeinflussung der Längen- bzw. Zugspannungsverteilung wurden verschiedene Regelverfahren entwickelt, welche die über die Bandbreite gemessene Zugspannungs- bzw. Längenmeßwerte auswerten und danach die Stellglieder beispielsweise die Walzenbiegung der Walzstraße betätigen. Die deutsche Offenlegungsschrift 44 21 005 beschreibt eine Vorrichtung zum Steuern des Walzens, insbesondere des Kaltwalzens von Edelstahl, bei der umform- und anlagetechnische Restriktionen zur von walztechnischen Messungen ausgehenden Gestaltung eines reibungslosen Betriebsablaufs und eines einwandfreien Walzgutes einzuhalten sind.For influencing the length or tension distribution different control methods have been developed, which the tensile stress measured over the bandwidth or evaluate length measurements and then the actuators for example the roll bending of the rolling mill actuate. The German patent application 44 21 005 describes a device for controlling the rolling, especially the cold rolling of stainless steel, in which Forming and plant technology restrictions for Rolling measurements outgoing design of a smooth operation and a flawless Rolled goods must be observed.

Weitere Regelverfahren sind in der Zeitschrift "Iron and Steel Engineer", Juni 1979, Seiten 55 bis 60 und März 1984, Seiten 31 bis 38 beschrieben. Bei diesen Regelverfahren werden von den gemessenen Zugspannungs- bzw. Längenwerten lediglich einige Werte an den Bandkanten und in der Bandmitte zum Berechnen der Verstellwerte herangezogen. Ein weiteres Regelverfahren ist beschrieben in "Neue Hütte" 1986, Seiten 365 bis 370. Bei diesem Verfahren werden die Zugspannungs- und Längenmeßwerte nach der Fehlerquadratmethode durch ein Polynom n-ten-Grades angenährt. Schließlich ist in "Metallurgical Plant and Technology" 1984, Seiten 72 bis 77, ein Planheitsregelverfahren beschrieben, bei dem die Stellglieder so kombiniert verstellt werden, daß das Verhältnis der Verstellwege auch während des Verstellens konstant bleibt.Further control procedures are in the magazine "Iron and Steel Engineer ", June 1979, pages 55 to 60 and March 1984, pages 31 to 38. With these Control procedures are based on the measured tensile stress or length values only a few values at the strip edges and in the middle of the band to calculate the adjustment values used. Another control procedure is described in "Neue Hütte" 1986, pages 365 to 370. With this method the tensile stress and Length measurements according to the least squares method with a Polynomial n-degree degrees approximated. Finally in "Metallurgical Plant and Technology" 1984, pages 72 to 77, described a flatness control method in which the Actuators are adjusted so that the combination Ratio of the adjustment paths also during the adjustment remains constant.

Beim Einsatz des zuletzt erwähnten Planheitsregelverfahrens zum Herstellen kalt gewalzter Bänder ergibt sich im allgemeinen ein qualitativ gutes Band, wenn der Prozeß in der stationären Walzphase abläuft. Dies gilt für die Banddicke, die mechanischen Eigenschaften und die Bandplanheit. Wesentlich ungünstiger stellen sich die Verhältnisse in der instationären Phase, wenn sich das Band nur in einem Teil der Gerüste einer Walzstraße befindet, dar, d.h. in der Bandeinfädelphase, aber auch in der Anfangsphase jedes Walzstiches. Diese Phasen laufen bisher weitgehend ohne automatische Regelung ab. Sie bleiben in starkem Maße dem Eingriff des Walzers vorbehalten, der im Hinblick auf eine bestimmte Banddicke und Bandplanheit unter anderem die folgenden Werte einstellt: Walzkraft, Anstellposition, Position der Stellglieder zum Beeinflussen des Walzspaltes, Vor- und Rückzugskräfte, Walzgeschwindigkeit und Kühlmittelmenge.When using the flatness control method mentioned last results for the production of cold rolled strips generally a good quality tape if the Process in the stationary rolling phase takes place. this applies for the strip thickness, the mechanical properties and the band flatness. They turn out to be considerably less favorable the conditions in the transient phase when the strip only in part of the stands of a rolling mill is, i.e. in the threading phase, but also in the initial phase of each roll pass. These phases have so far largely run without automatic control. They remain to a large extent in the engagement of the roller reserved with regard to a particular Strip thickness and flatness among others the following Sets values: rolling force, position, position the actuators for influencing the roll gap, pre and retraction forces, rolling speed and Amount of coolant.

Bei der Vorgabe der Walzkraft wird das Walzensystem im Hinblick auf eine bestimmte auf das Band auszuübende Kraft eingestellt. Bei der Vorgabe der Stellgliedpositionen dagegen wird das Walzensystem im Hinblick auf eine bestimmte Geometrie des Walzspaltes eingestellt.When the rolling force is specified, the roller system in With regard to a specific tape to be exercised Force set. When specifying the actuator positions opposed to the roller system with regard to a certain geometry of the roll gap is set.

Die Größenvoreinstellung richtet sich dabei nach den jeweils bei Stichbeginn gegebenen Bandabmessungen, also der Banddicke und -breite, dem jeweiligen Werkstoff und der Querschnittsabnahme. Die Voreinstellung des Reversiergerüsts oder der Walzstraße durch den Walzer kann erheblich von betrieblichen Vorgaben abweichen. Außerdem sind bei gleichem Walzprogramm beträchtliche individuelle Unterschiede beim Einstellen der Walzparameter in der Anfangsphase eines Walzstiches möglich. Die Ursache hierfür liegt sowohl in einer Überforderung des Steuermannes als Folge der Vielzahl der auszuführenden Stellmaßnahmen, als auch in einer unterschiedlichen individuellen Bewertung des Walzgeschehens. Daher ist es nicht zu vermeiden, daß sich Bandanfang und Bandende in ihren geometrischen Eigenschaften, vorwiegend der Banddicke und -ebenheit, von dem stationär gewalzten Mittelabschnitt des Bandes unterscheiden und daher in den Schrott gehen.The default size depends on the tape dimensions given at the start of the stitch, i.e. the strip thickness and width, the respective material and the cross-sectional decrease. The default of Reversing stand or the rolling train through the waltz can deviate significantly from operational requirements. In addition, with the same rolling program are considerable individual differences when setting the Rolling parameters in the initial phase of a roll pass possible. The reason for this lies in one Overtaxing the helmsman as a result of the large number the control measures to be carried out, as well as in a different individual assessment of the Rolling events. It is therefore unavoidable that beginning and end of the band in their geometric Properties, mainly the strip thickness and flatness, from the stationary rolled middle section of the strip distinguish and therefore go to the scrap.

Besondere Schwierigkeiten bereitet sowohl für den Handbetrieb als auch für den automatischen Betrieb das Voreinstellen der Gerüste für den ersten Stich, da in den wenigsten Fällen das hierfür benötigte Dickenprofil bekannt ist.Special difficulties arise for both Manual operation as well as for automatic operation Presetting the frameworks for the first stitch, as in in very few cases the thickness profile required for this is known.

Der Erfindung liegt das Problem zugrunde, sowohl die Voreinstellung der für ein neues Coil als auch für ein kaltangewalztes Coil - nach einem Walzenstillstand vor dem nächsten Stich oder bei Walzenwechsel erforderlichen Stellgliedpositionen der Bandplanheit zu automatisieren. Außerdem sollte die Bandplanheits-Voreinstellung des jeweiligen Walzgerüstes für den ersten Stich eines neuen Coils auch ohne Kenntnis des bei Stichbeginn vorhandenen Band- bzw. Dickenprofils des Warmbandes möglich sein.The invention is based on the problem, both the Presetting the for a new coil as well as for a cold rolled coil - after a roll stop before the next stitch or when changing the roller Automate actuator positions of the band flatness. In addition, the band flatness preset of the respective roll stand for the first pass of a new one Coils even without knowledge of the existing one at the start of the stitch Strip or thickness profile of the hot strip may be possible.

Die Lösung besteht bei einem aktuellen Coil darin, daß erfindungsgemäß als Stellgliedpositionen für die Bandplanheit die entsprechenden Ist-Daten des ersten Stichs eines aus n zuvor gewalzten Coils ausgewählten Referenz-Coils eingesetzt werden, dessen Referenzdaten, nämlich die Gerüsteinstell-, Bandplanheits- und Coildaten, die beste Übereinstimmung mit den Zieldaten des aktuellen Coils ergeben und daß jeweils eine aus den Daten des einzelnen Ist-Referenzzustandes zuzüglich einer von der Differenz der Daten des Referenzzustandes und des Zielzustandes abhängigen Stellgliedänderung gebildete Stellgliedpostion eingesetzt wird. Darin gilt n = 1,2,... Das aktuelle Coil wird auf der Basis desjenigen historischen Datensatzes gewalzt, der die größte Planheitsähnlichkeit mit dem Sollzustand besitzt.The solution for a current coil is that according to the invention as actuator positions for the strip flatness the corresponding actual data of the first stitch a reference coil selected from n coils previously rolled are used, whose reference data, namely the scaffold setting, band flatness and coil data, the best match with the target data of the current Coils and that one each from the data of the individual actual reference state plus one of the Difference between the data of the reference state and the Target state dependent actuator change formed Actuator position is used. Here n = 1,2, ... The current coil is based on that historical record rolled, the largest Flatness similarity to the target state.

Für das Verfahren zum Voreinstellen beim Wiederanfahren nach einem Stillstand bzw. von Stich zu Stich besteht die Lösung darin, daß die Stellgliedposition für die Bandplanheit ausgehend von den entsprechenden Ist-Daten, die unmittelbar vor dem Stillstand vorlagen, eingesetzt werden und daß jeweils eine aus den Daten des einzelnen Ist-Referenzzustandes zuzüglich einer von der Differenz der Daten des Referenzzustandes und des Zielzustandes abhängigen Stellgliedänderung gebildete Stellgliedposition eingesetzt wird. Dies erlaubt es, die sich bei jedem Stich zwangsläufig ergebende Kaltverfestigung des Bandes zu berücksichtigen, die sich genauso auswirkt, wie wenn ein anderer Werkstoff gewalzt würde.For the procedure for presetting when restarting after a standstill or from stitch to stitch the solution is that the actuator position for the Strip flatness based on the corresponding actual data, that existed immediately before the standstill and that each one from the data of the individual Actual reference state plus one of the difference the data of the reference state and the target state dependent actuator change formed Actuator position is used. This allows the resulting inevitably with each stitch Strain hardening of the strip to be taken into account has the same effect as if another material was rolled would.

Erfindungsgemäß können die Stellglieder für die Bandplanheit automatisch voreingestellt werden. Für die Bestimmung der einzelnen Stellgliedpositionen wird erfindungsgemäß Bezug genommen auf einen Referenzzustand mit Ist-Daten aus einem bzw. aus dem vorangegangenen Prozeß. Dazu werden n vorher gewalzte Coils betrachtet und dasjenige Coil zum Vergleich herangezogen, dessen Referenzdaten den Zieldaten des aktuellen Coils am nächsten kommen. Als Prozeßdaten des Referenz-Coils kommen für die Bandplanheit beispielsweise infrage: Walzkraft, Bandzug, Ein- und Auslaufdicke, Position der Planheitsstellglieder und Walzengeometrie.According to the invention, the actuators for the strip flatness are automatically preset. For the Determination of the individual actuator positions according to the invention referred to a reference state with actual data from one or from the previous one Process. For this, n previously rolled coils are considered and the coil used for comparison, whose Reference data the target data of the current coil on come next. As process data of the reference coil For the band flatness, for example: Rolling force, strip tension, inlet and outlet thickness, position of the Flatness actuators and roller geometry.

Erfindungsgemäß ist zum Ermitteln der Stellgliedpositionen beim Voreinstellen der Stellglieder für die Bandplanheit die Kenntnis des Dickenprofils des aktuellen Coils nicht erforderlich. Der Walzspalt läßt sich auch einem unbekannten Bandprofil anpassen. Das ist sehr vorteilhaft, denn das Band soll beim Kaltwalzen das Profil behalten, das es vom Warmwalzen her hatte; eine Profiländerung beim Kaltwalzen würde zu Wellen im Band führen. Wenn das Banddickenprofil bekannt ist, kann es jedoch ebenfalls beim Bestimmen der Stellgliedpositionen berücksichtigt werden.According to the invention for determining the actuator positions when presetting the actuators for the Strip flatness the knowledge of the thickness profile of the current Coils not required. The roll gap can be also adjust an unknown band profile. Which is very advantageous because the strip should do that during cold rolling Keep the profile it had from hot rolling; a Profile change during cold rolling would cause waves in the strip to lead. If the strip thickness profile is known, it can however also when determining the actuator positions be taken into account.

Die Erfindung bezieht sich auf eine Automatik für die instationäre Walzphase sowohl bei einem neuen Coil als auch nach einem Stillstand. Im Rahmen der Erfindung können als Referenzdaten für den ersten Stich eines neuen Coils die Ist-Daten vom Stichbeginn der letzten n gewalzten Coils aus einer nach Kategorien unterteilten Datensammlung entnommen werden. Die Kategorien sind beispielsweise: Qualität, Bandbreite und Banddicke.The invention relates to an automatic system for the unsteady rolling phase both with a new coil and even after a standstill. Within the scope of the invention can be used as reference data for the first stitch of a new coils, the actual data from the start of the last n rolled coils from a category Data collection can be taken. The categories are for example: quality, bandwidth and strip thickness.

Als Referenz-Coils für das Walzen eines neuen Coils wird erfindungsgemäß - wie gesagt - dasjenige früher gewalzte Coil ausgewählt, dessen Gerüsteinstell-, Bandplanheits- und Werkstoffdaten die beste Übereinstimmung mit dem Zielzustand des neuen Coils ergeben. Hierdurch ergibt sich auch eine automatische Adaption von Änderungen, die sich bei längerem Walzbetrieb, beispielsweise durch längerfristige Änderung des Warmbanddickenprofils einstellen.As a reference coil for rolling a new coil according to the invention - as said - that previously rolled Coil selected, the scaffold adjustment, band flatness and material data the best match with the Target state of the new coil. This gives also an automatic adaptation of changes that during long rolling operations, for example Long-term change in the hot strip thickness profile to adjust.

Sowohl bei dem erfindungsgemäßen Voreinstellen der geregelten Stellgliedpositionen bei einem neuen Coil als auch nach einem Stillstand des Walzgerüstes kann jeweils eine aus der Summe des einzelnen Ist-Referenzzustandes und einer von der Differenz des Referenz-Zustands und des Zielzustandes abhängige Stellgliedänderung gebildete Stellgliedposition eingesetzt werden. In beiden Fällen wird die Stellgliedänderung berechnet, die sich aus den Daten der Differenz des Referenzzustandes und des Zielzustandes ergibt. Mit anderen Worten: Die neue Stellgliedposition ergibt sich aus der früheren Stellgliedposition des Referenzzustandes zuzüglich einer gesondert bestimmten Stellgliedänderung. Diese läßt sich entweder unter Verwendung eines Walzspaltmodells bestimmen oder die Einflußfunktionen der Planheitsstellglieder und der Einfluß der Walzkraft werden vorab mit einem Walzspaltmodell ermittelt. Diese Vorabermittlung kann im Rahmen der Erfindung auch in Kombination mit einer Prozeßparametrierung oder allein durch eine Prozeßparametrierung erfolgen. Bei einer Prozeßparametrierung werden die Parameter eines empirischen Algorithmusses durch Versuche ermittelt, die an dem für den jeweiligen Anwendungsfall benutzten Gerüst durchzuführen sind.Both when presetting the invention controlled actuator positions for a new coil as even after the rolling stand has come to a standstill one from the sum of the individual actual reference status and one of the difference of the reference state and of the target state dependent actuator change Actuator position can be used. In both cases the actuator change is calculated, which results from the Data of the difference between the reference state and the Target state results. In other words: the new one Actuator position results from the previous one Actuator position of the reference state plus one separately determined actuator change. This can be either using a roll gap model determine or the influence functions of the Flatness actuators and the influence of the rolling force are determined in advance with a roll gap model. This Preliminary determination can also be carried out within the scope of the invention Combination with a process parameterization or alone by means of process parameterization. At a Process parameterization are the parameters of a empirical algorithm must be determined by experiments which on the one used for the respective application Scaffolding must be carried out.

Die Erfindung betrifft des weiteren ein Verfahren zum Voreinstellen der Banddicke bei einem Reversiergerüst oder einer Walzstraße für ein neues Coil oder den jeweils nächsten Stich eines angewalzten Coils beim Kaltwalzen von Bändern insbesondere aus Edelstahl. Dem liegt das Problem zugrunde, die bei jedem Stichbeginn erforderlichen Stellgliedpositionen der Banddicke zu automatisieren. Das Walzgerüst soll bei Stichbeginn automatisch auf eine Walzdicke eingestellt werden, die während des stationären Zustands exakt eingehalten wird. Vorzugsweise soll die Banddicken-Voreinstellung des jeweiligen Walzgerüstes für den ersten Stich eines neuen Coils auch ohne Kenntnis des bei Stichbeginn vorhandenen Band- bzw. Dickenprofils des Warmbandes möglich sein.The invention further relates to a method for Presetting the strip thickness for a reversing stand or a rolling mill for a new coil or the next stitch of a rolled coil at each Cold rolling of strips, in particular made of stainless steel. The the underlying problem is that at every stitch start required actuator positions of the strip thickness automate. The roll stand should start at the start of the stitch are automatically set to a roll thickness that is maintained exactly during the steady state. Preferably, the strip thickness presetting of the respective roll stand for the first pass of a new one Coils even without knowledge of the existing one at the start of the stitch Strip or thickness profile of the hot strip may be possible.

Für das Voreinstellen der Banddicke besteht die Lösung im Rahmen der Erfindung bevorzugt darin, daß die Banddicke durch Vorgabe einer über einen bestimmten Zeitraum aus den Ist-Daten von Referenzzuständen des jeweiligen Walzgerüstes adaptierten Walzkraft oder Anstellpostion voreingestellt wird.The solution is to preset the strip thickness preferred in the context of the invention in that the strip thickness by specifying one over a period of time from the actual data of reference states of the respective Roll stand adapted rolling force or position is preset.

Demgemäß wird bevorzugt die Banddicke über die Vorgabe einer vorbestimmten Walzkraft oder über die Vorgabe einer vorbestimmten Anstellposition voreingestellt. Dabei sollten die Fließkurven zum Bestimmen der Vorgabedaten über einen gewissen vorausgegangenen Zeitraum aus den aktuellen Prozeßdaten für das jeweilige Walzgerüst adaptiert werden. Dadurch wird erreicht, daß auch bei noch unbekanntem Dickenprofil des Bandes praktisch unmittelbar bei Stichbeginn automatisch die Banddicke eingestellt wird, die auch im stationären Bereich gewalzt wird. Wegen der Automatik fallen zeitaufwendige Anfahrvorgänge weg, Prozeßstörungen wie Bandrisse sind praktisch ausgeschlossen.Accordingly, the tape thickness is preferred over the default a predetermined rolling force or the default preset a predetermined position. The flow curves should be used to determine the default data over a certain previous period from the current process data for the respective roll stand be adapted. This ensures that too practical with an as yet unknown thickness profile of the tape immediately at the start of the stitch, the tape thickness which is also set in the stationary area is rolled. Because of the automatic fall time consuming Start-up processes are gone, process disruptions such as belt breaks practically excluded.

Bei dem bevorzugten Verfahren zum Voreinstellen der Banddicke vor einem neuen Stich wird - wie üblich - beim Übergang vom Stich n zum Stich n+1 (n = 0,1,2...) nicht nur ein kleinerer Walzspalt eingestellt, sondern es werden auch die übrigen Kennwerte des Walzgerüstes so geändert, daß das Band bei unverändertem relativen Dickenprofil dünner wird. Vorzugsweise lassen sich somit Walzdicken bzw. Walzspaltweiten bei Stichbeginn automatisch voreinstellen, die im weiteren Verlauf des Walzens exakt eingehalten werden.In the preferred method for presetting the Strip thickness before a new stitch is - as usual - at No transition from stitch n to stitch n + 1 (n = 0.1.2 ...) just set a smaller nip, but it the other characteristic values of the roll stand will also be the same changed that the tape with unchanged relative Thickness profile becomes thinner. Thus, preferably Roll thicknesses or roll gap widths at the start of the stitch automatically preset, which later in the Rolls are observed exactly.

Anhand der schematischen Darstellung in den beiliegenden Flußschemata werden Einzelheiten der Erfindung erläutert. Es zeigen:

Tafel 1
die Vorgehensweise bei der Bezugnahme auf einen Referenzzustand beim Voreinstellen der Bandplanheit;
Tafel 2
die Ermittlung der neuen Stellgliedpositionen für die Bandplanheit mit Hilfe einer On-line-Berechnung des Walzspalts unter Berücksichtigung des Referenzzustandes;
Tafel 3
die Ermittlung der neuen Stellgliedpositionen mit Hilfe von Einflußfunktionen und Einflußfaktoren, die für die verschiedenen Planheitsstellglieder sowie die Walzkraft über eine Vorabbestimmung mit einem Walzspaltmodell ermittelt werden und
Tafel 4
die Ermittlung der Walzkraft bzw. Anstellposition für eine gewünschte Banddicke.
Details of the invention are explained on the basis of the schematic representation in the enclosed flow diagrams. Show it:
Plate 1
the procedure for referencing a reference condition when presetting the band flatness;
Plate 2
the determination of the new actuator positions for the strip flatness with the help of an on-line calculation of the roll gap taking into account the reference state;
Table 3
the determination of the new actuator positions with the aid of influencing functions and influencing factors, which are determined for the various flatness actuators and the rolling force via a preliminary determination with a roll gap model and
Plate 4
the determination of the rolling force or position for a desired strip thickness.

In Tafel 1 wird der Referenzzustand für die verschiedenen Ereignisse, nämlich für das Walzen eines neuen Coils oder für das Wiederanfahren nach einem Stillstand des Walzgerüsts unterschieden. Im ersten Fall dienen als Referenzdaten für den ersten Stich des neuen Coils die Ist-Daten vom Stichbeginn eines Coils gleicher Kategorie, beispielsweise Qualität, Bandbreite und Banddicke, das aus den letzten n gewalzten Coils ausgewählt wurde. Im anderen Fall nach einem Stillstand, z.B. bei jedem neuen Stich oder bei einem Walzenwechsel dienen als Referenzdaten die Ist-Daten, die unmittelbar vor dem Stillstand bei demselben Coil angefallen sind. Der so bestimmte Referenzzustand (die einzelnen Werte oder Wertbeispiele sind in Tafel 1 angegeben) wird zusammen mit dem Sollzustand (auch hierzu sind die einzelnen Daten in der Tafel 1 angegeben) einem Rechenalgorythmus zugeführt, der die Stellgliedpositionen für die Bandplanheit liefert.Table 1 shows the reference state for the various Events, namely for rolling a new one Coils or for restarting after a standstill of the mill stand. In the first case, serve as Reference data for the first stitch of the new coil Actual data from the start of the stitch of a coil are the same Category, for example quality, bandwidth and Strip thickness, that from the last n rolled coils was selected. In the other case after a standstill, e.g. with every new stitch or when changing the reel serve as reference data the actual data that immediately accumulated on the same coil prior to standstill. The reference state determined in this way (the individual values or value examples are given in Table 1) together with the target state (also here are the individual data given in Table 1) one Arithmetic algorithm fed to the actuator positions for the flatness of the tape.

Nach den Flußschemata von Tafel 2 und 3 werden die erfindungsgemäßen Stellgliedpositionen ermittelt, die sich aus der Stellgliedposition des Referenzzustandes zuzüglich der berechneten Stellgliedänderung ergeben. Gemäß Tafel 2 erfolgt die Berechnung On-Line unter Verwendung eines Walzspaltmodells. Die Berechnung der neuen Stellgliedpositionen soll iterativ erfolgen. Die Iteration wird gegebenenfalls dann beendet, wenn die Differenz der Stellgliedpositionen des aktuellen Iterationsschrittes zu den Stellgliedpositionen des vorhergehenden Schrittes einen bestimmten, vorgegebenen Grenzwert unterschreitet Dieser Grenzwert orientiert sich an der Positionsgenauigkeit des Stellgliedes.According to the flow diagrams in Table 2 and 3, the actuator positions according to the invention determined that itself from the actuator position of the reference state plus the calculated actuator change. According to Table 2, the calculation is carried out on-line at Use of a roll gap model. The calculation of the new actuator positions are to be carried out iteratively. The If necessary, the iteration is ended when the Difference in actuator positions for the current iteration step to the actuator positions of the previous one Step a certain, predetermined Limit falls below This limit is oriented the position accuracy of the actuator.

Gemäß Tafel 3 werden die Einflußfunktionen der Planheitsstellglieder und der Einfluß der Walzenkraft vorab mit Hilfe des Walzspaltmodells ermittelt. Die Einzelheiten der aufeinanderfolgenden Operationen ergeben sich in übersichtlicher Weise aus den Tafeln 2 und 3.According to Table 3, the influencing functions of the flatness actuators and the influence of the roll force beforehand determined with the help of the roll gap model. The Details of the successive operations result in a clear manner from the tables 2 and 3.

Die Tafel 4 veranschaulicht ein Ausführungsschema des Verfahrens zum Ermitteln der vorzugebenden Walzkraft bzw. Anstellposition zwecks Erreichens der gewünschten Soll-Auslaufdicke unter Berücksichtigung eines Referenzzustandes. Der Zielzustand ist definiert durch: die Einlaufdicke des Bandes, die Soll-Auslaufdicke und den Bandzug. Zum Erreichen des Ziels werden die Werte des Referenzzustandes - vorzugsweise on-line - über eine Einflußfunktion abhängig von den Meßwerten des Referenzzustandes, beispielsweise Walzkraft/Anstellposition, Einlaufdicke, Auslaufdicke und Bandzug korrigiert. Das Ergebnis ist die vorzugebende Walzkraft oder Anstellposition, mit der das Band bei jedem neuen Stich, auch beim ersten Stich, automatisch gewalzt wird.Table 4 illustrates an implementation scheme of the Method for determining the rolling force to be specified or position to achieve the desired Target outlet thickness taking into account a reference condition. The target state is defined by: the Inlet thickness of the strip, the target outlet thickness and the Belt tension. To achieve the goal, the values of the Reference state - preferably online - via a Influence function depending on the measured values of the Reference state, e.g. rolling force / position, Corrected inlet thickness, outlet thickness and belt tension. The result is the rolling force to be specified or position with which the belt with each new Stitch, even at the first stitch, is rolled automatically.

Claims (6)

  1. Process for pre-setting the actuator position of a reversing stand or mill train for the initial pass of a new coil during cold rolling of strip steel, in particular stainless steel, characterised in that the measured data of the initial pass of a previously rolled reference coil is used as reference data for the flatness actuator position. The said reference coil is chosen from n previously rolled coils. This measured data comes closest to the desired target data for the new coil. One actuator position is used each time. This actuator position is derived from the data of each individual actual reference condition and an actuator position modification which is derived from the difference between the reference and the target condition data.
  2. Process for pre-setting the actuator position of a reversing stand or a mill train for restarting the mill after a stoppage during the cold rolling of strip steel, in particular stainless steel characterised in that the actuator positions for controlling flatness of the strip, based on the corresponding measured data which were available immediately before the stoppage, are used and that for each operation one actuator position is resulting from the data of each individual actual reference condition and an actuator position modification which is derived from the difference between the reference and the target condition data.
  3. Process according to claim 1 or 2, characterised in that actuator position change is employed based on a roll nip model or process parametrisation.
  4. Process according to one of claims 1 to 3, characterised in that the influence of the flatness data and roll force determined by a roll nip model or process parametrisation is taken into consideration.
  5. Process according to one of claims 1 to 4 for pre-setting the strip thickness actuator position at a reversing stand or mill train for the cold rolling of strip steel for a new coil or for the next pass of a coil which is already in the process of rolling, characterised in that the strip thickness is pre-set by predetermining an adapted roll force or control position which is derived over a period of time from the measured data of reference conditions of the roll stand or mill train.
  6. Process according to claim 5 characterised in that the roll force, the control position, the entry thickness, the exit thickness and / or the strip tension are taken into account regarding the measured data of each reference condition.
EP97108853A 1996-06-07 1997-06-03 Presetting for a cold mill reversing stand Expired - Lifetime EP0811435B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19622825A DE19622825B4 (en) 1996-06-07 1996-06-07 Presetting for cold rolling reversing stand
DE19622825 1996-06-07

Publications (3)

Publication Number Publication Date
EP0811435A2 EP0811435A2 (en) 1997-12-10
EP0811435A3 EP0811435A3 (en) 1998-05-06
EP0811435B1 true EP0811435B1 (en) 2001-09-05

Family

ID=7796361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97108853A Expired - Lifetime EP0811435B1 (en) 1996-06-07 1997-06-03 Presetting for a cold mill reversing stand

Country Status (4)

Country Link
US (1) US5987948A (en)
EP (1) EP0811435B1 (en)
JP (1) JP3996976B2 (en)
DE (1) DE19622825B4 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831480C1 (en) * 1998-07-14 2000-01-13 Schloemann Siemag Ag Process for presetting cold forming plants
DE19851554C2 (en) * 1998-11-09 2001-02-01 Siemens Ag Method and device for presetting a rolling mill
DE19900428A1 (en) * 1999-01-08 2000-07-13 Sms Demag Ag Rolling mill for rolling rod-shaped rolling stock, e.g. B. steel bars or wire
ATE255964T1 (en) * 1999-12-23 2003-12-15 Abb Ab METHOD AND DEVICE FOR PLANNING CONTROL
DE10106584A1 (en) 2001-02-13 2002-09-19 Siemens Ag Method and device for presetting process variables of a rolling mill for rolling metal strips
US8707529B2 (en) * 2008-12-11 2014-04-29 The Material Works, Ltd. Method and apparatus for breaking scale from sheet metal with recoiler tension and rollers adapted to generate scale breaking wrap angles
EP2527052A1 (en) * 2011-05-24 2012-11-28 Siemens Aktiengesellschaft Operating method for a mill train
CN102688896B (en) * 2012-05-16 2014-04-16 燕山大学 Mechanism model-based virtual crown gauge setting method for four-roll cold continuous rolling machine set
WO2023146701A1 (en) * 2022-01-27 2023-08-03 Novelis Inc. System and method for controlling threading in a rolling mill

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57137014A (en) * 1981-02-17 1982-08-24 Sumitomo Metal Ind Ltd Controlling method for flatness of steel plate by variable crown roll
JPH0653283B2 (en) * 1986-04-02 1994-07-20 株式会社日立製作所 Adaptive control method in rolling mill
US4745556A (en) * 1986-07-01 1988-05-17 T. Sendzimir, Inc. Rolling mill management system
NL8700776A (en) * 1987-04-02 1988-11-01 Hoogovens Groep Bv METHOD FOR PRESETING A ROLLING MILL AND A CONTROL DEVICE SUITABLE FOR THAT.
JPS6478612A (en) * 1987-09-21 1989-03-24 Kobe Steel Ltd Arithmetic unit for gap between rolls of multistage rolling mill
SU1547898A1 (en) * 1988-06-07 1990-03-07 Киевский институт автоматики им.ХХУ съезда КПСС Method of automatic controlling a set of mechanical propeties of steel sheets being rolled and system for effecting same
US5054302A (en) * 1989-04-07 1991-10-08 Kawasaki Steel Corporation Hardness compensated thickness control method for wet skin-pass rolled sheet
DE4040360A1 (en) * 1990-12-17 1991-06-27 Siemens Ag Multiple-stand strip rolling control - uses model comparisons and converging parameters to maintain strip profile and flatness
JPH05138220A (en) * 1991-11-22 1993-06-01 Hitachi Ltd Device and method for adjusting zero in presence of sheet for continuous mill
US5680784A (en) * 1994-03-11 1997-10-28 Kawasaki Steel Corporation Method of controlling form of strip in rolling mill
JP2677964B2 (en) * 1994-03-11 1997-11-17 川崎製鉄株式会社 Rolling mill shape control initial setting method
DE4421005B4 (en) * 1994-06-18 2007-09-27 Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH Device for controlling the rolling
JPH0824927A (en) * 1994-07-18 1996-01-30 Nisshin Steel Co Ltd Method and device for automatic control of rolling shape of metal strip
US5609053A (en) * 1994-08-22 1997-03-11 Alcan Aluminum Corporation Constant reduction multi-stand hot rolling mill set-up method
DE19545262B4 (en) * 1995-11-25 2004-08-05 Alstom Power Conversion Gmbh Device for operating a multi-stand rolling mill

Also Published As

Publication number Publication date
US5987948A (en) 1999-11-23
JP3996976B2 (en) 2007-10-24
DE19622825A1 (en) 1997-12-11
EP0811435A2 (en) 1997-12-10
EP0811435A3 (en) 1998-05-06
DE19622825B4 (en) 2005-03-31
JPH1052706A (en) 1998-02-24

Similar Documents

Publication Publication Date Title
DE69102280T2 (en) METHOD AND SYSTEM FOR THE PRODUCTION OF STEEL TAPE COILS DIRECTLY GENERATED FROM A HOT ROLLING MILL WITH COLD ROLLING PROPERTIES.
DE19522494C2 (en) Process for rolling a metal strip
DE1427892A1 (en) Control and regulation device for rolling mill
DE2944035C2 (en)
DE19540978A1 (en) Production plant for the continuous or discontinuous rolling out of hot strip
DE2023799B2 (en) Device for controlling a cooling device for strip-shaped rolling stock
EP0121148A1 (en) Method of making hot rolled strip with a high quality section and flatness
EP0811435B1 (en) Presetting for a cold mill reversing stand
DE1527761C3 (en) Device for the operational compensation of the change in the crowning of the work rolls of a rolling mill
EP1519798A1 (en) Method and casting roller plant for the semi-endless or endless rolling by casting of a metal in particular a steel strip which may be transversely separated as required after solidification
DE1427888B2 (en) Device for reducing the thickness of strip material
DE3303829C2 (en)
DE2808888C2 (en) Rolling mill
DE3026229C2 (en)
DE1126492B (en) Device for controlling the strip thickness in continuous hot rolling mills
DE19511801A1 (en) Method and device for thickness control in film rolling
EP1069963B1 (en) Method and device for producing cambered sections of spring band
DE1958162A1 (en) Procedure for advance control of a tandem mill
DE10159608C5 (en) Rolling process and rolling train for a band with a weld
WO2010020488A1 (en) Method for controlling or regulating a drive load of a motor driving a roller of a roller combination, control and/or regulating device, machine-readable program code, storage medium, and industrial plant
EP0272204B1 (en) Method for controlling the thickness of tubewall
EP3877141A1 (en) Method and device for monitoring an edge section of a film web
DE3637043A1 (en) Method for the predetermined maintenance of narrow thickness tolerances during the rolling of rolling stock in hot-strip rolling trains
DE19644131C2 (en) Method for optimizing the distribution of strip width at the ends of a strip passing through a rolling train in one or more passes
DE3807399C3 (en) Process for regulating the gap width between the work rolls of a cold rolling stand for the production of strips of metal

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): FR GB SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): FR GB SE

17P Request for examination filed

Effective date: 19981104

AKX Designation fees paid

Free format text: FR GB SE

RBV Designated contracting states (corrected)

Designated state(s): FR GB SE

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 20001010

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): FR GB SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20011206

ET Fr: translation filed
PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: ABB PATENT GMBH

Effective date: 20020524

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBO Opposition rejected

Free format text: ORIGINAL CODE: EPIDOS REJO

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION REJECTED

27O Opposition rejected

Effective date: 20030410

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20090623

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20090618

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090623

Year of fee payment: 13

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100603

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100603

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100604