EP0721811A1 - Method of regulating the roll gap section - Google Patents

Method of regulating the roll gap section Download PDF

Info

Publication number
EP0721811A1
EP0721811A1 EP95119765A EP95119765A EP0721811A1 EP 0721811 A1 EP0721811 A1 EP 0721811A1 EP 95119765 A EP95119765 A EP 95119765A EP 95119765 A EP95119765 A EP 95119765A EP 0721811 A1 EP0721811 A1 EP 0721811A1
Authority
EP
European Patent Office
Prior art keywords
stand
changes
geometry
positions
change
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.)
Ceased
Application number
EP95119765A
Other languages
German (de)
French (fr)
Inventor
Klaus-Dieter Haberkamm
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag AG
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
Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0721811A1 publication Critical patent/EP0721811A1/en
Ceased legal-status Critical Current

Links

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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • 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
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
    • B21B38/105—Calibrating or presetting roll-gap

Definitions

  • the invention relates to a method for controlling the roll gap profile in strip rolling mills with drive and operator-side hydraulic adjustment devices, by means of which the rolls can be adjusted in a stand in a position-controlled manner.
  • the roll gap profile is influenced by shifting and / or by entangling and / or by correspondingly bending rolls in the roll stand. Such influences and influences by changes in force also cause changes in the position of the rollers.
  • the framework is in a reproducible state e.g. calibrated after a roll change.
  • the actuators used are in a neutral or initial position. Since the lower rolls of a roll stand are supported relatively rigidly on the foundations, but the upper rolls of the roll stand are supported less rigidly on the stand, leaving the starting situation as a result of the described influence on the stand geometry or in the force ratio increases the upper rolls change their position as the lower rollers do. This leads to undesired changes in the roll gap, with the result that the rolls have a different inclination to one another.
  • the axial displacement of one or more rollers changes the center of gravity. This changes the torque determined and compensated for during calibration in relation to the center of the scaffold. The operator must take this resulting inclination Manually change it so that a suitable roll gap profile is created.
  • the invention has for its object to be able to carry out such roll gap changes very quickly without the help of an experienced operator.
  • the associated changes in position or the changes in position caused by the changes are determined in the otherwise unloaded scaffold.
  • the position changes in the position determined for the corresponding changes are used in order to counteract the changes in the position of the position which inevitably occur during rolling.
  • the associated adjustment positions resulting from changes in the stand geometry and / or changes in the force relationships in the stand can be determined by tests before the rolling process, e.g. by recording one drive-side and one operator-side curve of the adjustment changes depending on the scaffold geometry and by recording one drive-side and one operator-side curve of the adjustment change depending on the force relationships.
  • the individual values of this curve are stored in the memory.
  • This subordinate control loop can be used to apply correction values to the actual control loop for the adjustment control, which preclude a change in the roll gap.

Landscapes

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

Abstract

In strip rolling mills with hydraulic roll adjustment, the shape of the roll gap is controlled by a method where the stand is calibrated using a reproducible set of rolling data prior to starting rolling. Position adjustment devices change stand geometry and/or load conditions. Changes in stand geometry and/or force conditions during rolling are compensated for by using the difference from the determined associated adjustment positions on drive and operating sides and regulating to zero. This regulation is secondary to adjustment regulation of the stand.

Description

Die Erfindung betrifft ein Verfahren zur Regelung des Walzspaltprofils in Bandwalzwerken mit antriebs- und bedienseitigen hydraulischen Anstellvorrichtungen, über welche die Walzen positionsgeregelt in einem Gerüst anstellbar sind.The invention relates to a method for controlling the roll gap profile in strip rolling mills with drive and operator-side hydraulic adjustment devices, by means of which the rolls can be adjusted in a stand in a position-controlled manner.

Es ist bekannt, daß das Walzspaltprofil durch Verschieben und/oder durch Verschränken und/oder durch entsprechendes Biegen von Walzen im Walzgerüst beeinflußt wird. Derartige Beeinflussungen sowie Beeinflussungen durch Kräfteänderungen bewirken auch Änderungen in der Anstellung der Walzen. Üblicherweise wird das Gerüst in einem reproduzierbaren Zustand z.B. nach einem Walzenwechsel kalibriert. Dabei befinden sich die verwendeten Stellglieder in einer neutralen bzw. Ausgangsstellung. Da sich die unteren Walzen eines Walzgerüstes auf den Fundamenten verhältnismäßig starr abstützen, die oberen Walzen des Walzgerüstes sich jedoch weniger starr am Ständer abstützen, bewirkt ein Verlassen der Ausgangssituation durch die geschilderte Beeinflussung in der Gerüstgeometrie bzw. im Kräfteverhältnis, daß sich die oberen Walzen stärker in ihrer Anstellung verändern als es die unteren Walzen tun. Dadurch kommt es zu ungewollten Veränderungen des Walzspalts mit der Folge, daß die Walzen eine andere Neigung zueinander einnehmen.It is known that the roll gap profile is influenced by shifting and / or by entangling and / or by correspondingly bending rolls in the roll stand. Such influences and influences by changes in force also cause changes in the position of the rollers. Usually the framework is in a reproducible state e.g. calibrated after a roll change. The actuators used are in a neutral or initial position. Since the lower rolls of a roll stand are supported relatively rigidly on the foundations, but the upper rolls of the roll stand are supported less rigidly on the stand, leaving the starting situation as a result of the described influence on the stand geometry or in the force ratio increases the upper rolls change their position as the lower rollers do. This leads to undesired changes in the roll gap, with the result that the rolls have a different inclination to one another.

Im einfachsten Fall führt z.B. das axiale Verschieben einer oder mehrerer Walzen zur Änderung des Schwerpunktes. Damit wird das beim Kalibrieren festgestellte und kompensierte Moment, bezogen auf die Gerüstmitte, verändert. Der Operator muß diese entstehende Schräglage manuell so verändern, daß ein wieder geeignetes Walzspaltprofil entsteht.In the simplest case, for example, the axial displacement of one or more rollers changes the center of gravity. This changes the torque determined and compensated for during calibration in relation to the center of the scaffold. The operator must take this resulting inclination Manually change it so that a suitable roll gap profile is created.

Der Erfindung liegt die Aufgabe zugrunde, derartige Walzspaltveränderungen ohne die Hilfe eines erfahrenen Operators sehr schnell durchführen zu können.The invention has for its object to be able to carry out such roll gap changes very quickly without the help of an experienced operator.

Zur Lösung dieser Aufgabe werden die Merkmale des Anspruchs 1 vorgeschlagen.To achieve this object, the features of claim 1 are proposed.

Zu jeder denkbaren Änderung von der Ausgangsstellung bzw. von dem Ausgangskräfteverhältnis, in denen das Gerüst kalibriert wurde, werden die dazugehörigen bzw. die durch die Änderungen hervorgerufenen Positionsänderungen in der Anstellung bei ansonsten unbelastetem Gerüst ermittelt. Während des Walzvorgangs werden bei sich ändernden Verhältnissen in der Gerüstgeometrie bzw. bei Änderungen in den Kräfteverhältnissen im Gerüst die zu den entsprechenden Änderungen ermittelten Positionsänderungen der Anstellung dazu herangezogen, um den sich zwangsläufig beim Walzen einstellenden Anstellpositionsänderungen entgegenzuwirken.For every conceivable change from the initial position or from the initial force ratio in which the scaffold was calibrated, the associated changes in position or the changes in position caused by the changes are determined in the otherwise unloaded scaffold. When the conditions in the stand geometry change or in the force relationships in the stand change during the rolling process, the position changes in the position determined for the corresponding changes are used in order to counteract the changes in the position of the position which inevitably occur during rolling.

Damit kann während des Walzvorgangs jeder denkbaren Änderung in der Gerüstgeometrie bzw. in den Kräfteverhältnissen entgegengewirkt werden, ohne daß sich Fehlstellungen des Walzspaltes ergeben, wie sie sich z.B. bei einfachen Anstellregelungen erst ergeben müssen, um anschließend auf einen optimalen Sollwert ausgeregelt werden zu können.This means that any conceivable change in the stand geometry or in the force relationships can be counteracted during the rolling process without resulting in misalignments of the roll gap, such as occur e.g. in the case of simple adjustment rules must first result in order to then be able to be adjusted to an optimal setpoint.

Es ist zweckmäßig, die Änderungen der Gerüstgeometrie und/oder der Kräfteverhältnisse im Gerüst sowie die zu diesen Änderungen gehörenden antriebs- und bedienseitigen Positionsänderungen der Anstellvorrichtungen in Speichern abzulegen, so daß sie beim Walzvorgang stets zur Verfügung stehen und aus dem Speicher ausgelesen werden können, um zur Regelung der Anstellposition herangezogen zu werden.It is expedient to store the changes in the stand geometry and / or the force relationships in the stand as well as the drive and operator-side position changes of the adjusting devices belonging to these changes in memories so that they are always available during the rolling process and can be read out from the store to be used to regulate the starting position.

Die sich bei Änderungen der Gerüstgeometrie und/oder bei Änderungen der Kräfteverhältnisse im Gerüst ergebenden zugehörigen Anstellpositionen können vor dem Walzvorgang durch Versuche ermittelt werden, z.B. durch Aufnahme von einer antriebsseitigen und einer bedienseitigen Kurve der Anstelländerungen in Abhängigkeit von der Gerüstgeometrie sowie durch Aufnahme von einer antriebsseitigen und einer bedienseitigen Kurve der Anstelländerung in Abhängigkeit von den Kräfteverhältnissen. Die einzelnen Werte dieser Kurve werden im Speicher abgelegt.The associated adjustment positions resulting from changes in the stand geometry and / or changes in the force relationships in the stand can be determined by tests before the rolling process, e.g. by recording one drive-side and one operator-side curve of the adjustment changes depending on the scaffold geometry and by recording one drive-side and one operator-side curve of the adjustment change depending on the force relationships. The individual values of this curve are stored in the memory.

Es besteht aber auch die Möglichkeit, die Kurven zu errechnen. Bei genügend schnellen Rechnern mit entsprechend großer Kapazität ist es nicht zwingend notwendig, die Kurven in Speichern abzulegen. Hier können die Kurven stets online nachgerechnet und die errechneten Werte rechtzeitig zur entsprechenden Regelung der Anstellung herangezogen werden.But there is also the possibility to calculate the curves. With sufficiently fast computers with a correspondingly large capacity, it is not absolutely necessary to store the curves in memories. Here the curves can always be recalculated online and the calculated values can be used in good time to regulate the employment accordingly.

Es ist angebracht, dem an sich bekannten Regelkreis für die Anstellung der Walzen einen Regelkreis zu unterlagern, in dem die Differenz zwischen der antriebs- und bedienseitigen Anstellposition gegen Null geregelt wird. Über diesen unterlagerten Regelkreis können dem eigentlichen Regelkreis für die Anstellregelung Korrekturwerte aufgeschaltet werden, die eine Walzspaltveränderung ausschließen.It is appropriate to subordinate the control loop for the adjustment of the rollers, which is known per se, to a control loop in which the difference between the drive position and the adjustment position on the drive side is regulated towards zero. This subordinate control loop can be used to apply correction values to the actual control loop for the adjustment control, which preclude a change in the roll gap.

Claims (5)

Verfahren zur Regelung des Walzspaltprofiles in Bandwalzwerken mit antriebs- und bedienseitigen hydraulischen Anstellvorrichtungen, über welche die Walzen positionsgeregelt in einem Gerüst anstellbar sind,
dadurch gekennzeichnet,
daß vor einem Walzbeginn das Gerüst in einem reproduzierbaren Zustand kalibriert wird,
daß für Änderungen der Gerüstgeometrie und/oder der Kräfteverhältnisse im Gerüst diesen zugehörige, sich ergebende Positionsänderungen der Anstellvorrichtungen ermittelt werden, und daß während des Walzbetriebs eingestellte bzw. sich einstellende Änderungen in der Gerüstgeometrie und/oder den Kräfteverhältnissen im Gerüst durch Heranziehen der Differenz zwischen den ermittelten zugehörigen antriebs- und bedienseitigen Anstellpositionen und Regelung der Anstellung gegen Null ausgeregelt werden.Method for regulating the roll gap profile in strip rolling mills with hydraulic adjustment devices on the drive and operating side, by means of which the rollers can be adjusted in a stand in a position-controlled manner,
characterized,
that the stand is calibrated in a reproducible state before the start of rolling,
that for changes in the stand geometry and / or the force relationships in the stand, the associated resulting changes in position of the adjusting devices are determined, and that changes or set changes in the stand geometry and / or the force relationships in the stand during the rolling operation by using the difference between the determined associated drive and operator-side adjustment positions and regulation of the adjustment towards zero. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die ermittelten Änderungswerte mit den dazugehörigen, sich ergebenden antriebs- und bedienseitigen Anstellpositionen gespeichert werden und daß die zu der sich während des Walzvorgangs einstellenden Gerüstgeometrie und/oder den Kräfteverhältnissen im Gerüst gehörenden Anstellpositionen jeweils aus dem Speicher ausgelesen und zur entsprechenden Regelung herangezogen werden.Method according to claim 1,
characterized,
that the determined change values are stored with the associated, resulting drive and operating positions and that the positions related to the stand geometry occurring during the rolling process and / or the force relationships in the stand are each read from the memory and used for the corresponding control. Verfahren nach Anspruch 2,
dadurch gekennzeichnet,
daß die sich zu jeder Änderung der Gerüstgeometrie und/oder jeder Änderung der Kraftverhältnisse im Gerüst ergebenden zugehörigen Anstellpositionen durch Versuche ermittelt werden.Method according to claim 2,
characterized,
that the associated positions of attack resulting for each change in the frame geometry and / or each change in the force relationships in the frame are determined by experiments. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die sich zu jeder Änderung der Gerüstgeometrie und/oder jeder Änderung der Kräfteverhältnisse im Gerüst ergebenden zugehörigen Anstellpositionen errechnet werden.The method of claim 1 or 2,
characterized,
that the associated positions of attack resulting for each change in the frame geometry and / or each change in the force relationships in the frame are calculated. Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß die Regelung der Differenz der sich jeweils ergebenden antriebs- und bedienseitigen Anstellpositionen gegen Null der Anstellregelung des Gerüstes unterlagert wird.Method according to one of claims 1 to 4,
characterized,
that the regulation of the difference between the resulting drive and operator-side setting positions towards zero is subordinate to the setting regulation of the scaffold.
EP95119765A 1995-01-07 1995-12-14 Method of regulating the roll gap section Ceased EP0721811A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19500336A DE19500336A1 (en) 1995-01-07 1995-01-07 Process for controlling the roll gap profile
DE19500336 1995-01-07

Publications (1)

Publication Number Publication Date
EP0721811A1 true EP0721811A1 (en) 1996-07-17

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EP95119765A Ceased EP0721811A1 (en) 1995-01-07 1995-12-14 Method of regulating the roll gap section

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Country Link
US (1) US5775154A (en)
EP (1) EP0721811A1 (en)
JP (1) JPH08238507A (en)
DE (1) DE19500336A1 (en)

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EP0985461A1 (en) * 1998-02-27 2000-03-15 Nippon Steel Corporation Sheet rolling method and sheet rolling mill
AU777487B2 (en) * 1998-02-27 2004-10-21 Nippon Steel & Sumitomo Metal Corporation Strip rolling method and strip rolling mill

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DE19718529A1 (en) * 1997-05-02 1998-11-12 Schloemann Siemag Ag Method for operating a rolling mill for hot and cold rolling flat products
CN100413610C (en) * 2005-11-30 2008-08-27 宝山钢铁股份有限公司 Control method for preventing head-bent of band-steel while milling course
US8205474B2 (en) * 2006-03-08 2012-06-26 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
US7849722B2 (en) 2006-03-08 2010-12-14 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
CN102989792B (en) * 2011-09-16 2014-07-09 上海梅山钢铁股份有限公司 Calibration method for clearance between rolls of hot-rolling vertical rolls
US9764368B2 (en) * 2011-09-23 2017-09-19 Sms Group Gmbh Rolling mill and rolling method
CN103121040B (en) * 2011-11-18 2015-03-04 宝山钢铁股份有限公司 Rapid detection method of tandem rolling rack condition
DE102020202107B4 (en) * 2020-02-19 2022-08-11 Kocks Technik Gmbh & Co Kg Device for loading rolls and internal parts of a roll stand during the adjustment of individual roll gauges
JP7420052B2 (en) * 2020-11-04 2024-01-23 トヨタ自動車株式会社 Press roll device and method for controlling the press roll device

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Publication number Priority date Publication date Assignee Title
EP0985461A1 (en) * 1998-02-27 2000-03-15 Nippon Steel Corporation Sheet rolling method and sheet rolling mill
EP0985461A4 (en) * 1998-02-27 2003-03-12 Nippon Steel Corp Sheet rolling method and sheet rolling mill
US6619087B2 (en) 1998-02-27 2003-09-16 Nippon Steel Corporation Strip rolling method and strip rolling mill
AU777487B2 (en) * 1998-02-27 2004-10-21 Nippon Steel & Sumitomo Metal Corporation Strip rolling method and strip rolling mill
EP1757379A1 (en) 1998-02-27 2007-02-28 Nippon Steel Corporation Strip rolling method and strip rolling mill
EP1757378A1 (en) * 1998-02-27 2007-02-28 Nippon Steel Corporation Strip rolling mill calibration method and device for the same
EP1757377A1 (en) * 1998-02-27 2007-02-28 Nippon Steel Corporation Strip rolling mill calibration method and device for the same

Also Published As

Publication number Publication date
US5775154A (en) 1998-07-07
DE19500336A1 (en) 1996-07-11
JPH08238507A (en) 1996-09-17

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