EP1919638A1 - Method for thickness regulation during a hot-rolling process - Google Patents

Method for thickness regulation during a hot-rolling process

Info

Publication number
EP1919638A1
EP1919638A1 EP06776361A EP06776361A EP1919638A1 EP 1919638 A1 EP1919638 A1 EP 1919638A1 EP 06776361 A EP06776361 A EP 06776361A EP 06776361 A EP06776361 A EP 06776361A EP 1919638 A1 EP1919638 A1 EP 1919638A1
Authority
EP
European Patent Office
Prior art keywords
rolling
thickness
roll
position signals
determined
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.)
Withdrawn
Application number
EP06776361A
Other languages
German (de)
French (fr)
Inventor
Olaf Norman Jepsen
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 Demag AG
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Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1919638A1 publication Critical patent/EP1919638A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • B21B1/24—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 continuous or semi-continuous process
    • B21B1/26—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 continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • B21B1/34—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 hot-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
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/06—Mill spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
    • 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
    • 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
    • B21B38/08—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-force

Definitions

  • the invention relates to a method for thickness control during rolling, in particular during hot rolling with at least one roll stand, wherein u.a. the current, middle position of the setting cylinder of the roll stand and the cumulative rolling force of the same are taken into account.
  • From DE 20 20 402 is a method for calculating the thickness G1 thin, hard workpieces after a Reduzier devisgang by a Reduzierwalzrange with opposite rolling surfaces and a measuring device for measuring the forces apart the surfaces, during the passage of the workpiece through the opposite rolling surfaces during a Reduziervorganges
  • a signal is generated, which is a measure of the thickness G5, which is determined by the intersection of a suitable roll elongation curve and a suitable workpiece deformation curve for the reduction process
  • b) a signal is generated which is a measure for a thickness G3 defined by the intersection of the measured force curve and the roll elongation curve
  • a signal indicative of a calculated stretch error is generated by plotting the signal representing the uncertainty range as a function of the reduction predicted for the reduction pass, the rolling strain predicted for the reduction, and the relative error probability in both the
  • a signal is generated which is a measure of the thickness G5 defined by the intersection of a suitable roll elongation curve and a suitable workpiece deformation curve for the reduction process
  • a signal is generated which is a measure of a thickness G3 passing through the intersection the curve for the measured force and the roller extension curve is determined
  • a signal is generated which represents a measure of an uncertainty region, which is determined by the difference between the thickness G5 and G3 signals
  • a signal is generated, which is a measure of represents a calculated extension error in that the signal representing the uncertainty region is a function of the rolling extension predicted for the reduction pass and the relative error probability in both the predetermination of the thickness decrease and the elongation is changed
  • a signal is generated which is a measure of the calculated thickness G1 by the signal representing the thickness G3 calculated strain error is added.
  • the so-called Gaugemeter help used to determine the current strip thickness for the thickness control when Wa in the roll.
  • the measured position S D s Sos the adjusting cylinder corrected by the calculated frame strain g (see also Figure 1).
  • the framework strain g is calculated by means of the measured rolling force F D s, F O s and a framework expansion curve 1 / M G.
  • the thus determined strip thickness is then compared with the thickness setpoint and compensated. For this process, apart from the measurements of position and rolling force, an exact framework model is required.
  • the invention is therefore based on the object to improve a method of the type described above such that the above-mentioned disadvantages are avoided.
  • This object is achieved according to the invention by minimizing the amount of skeleton expansion. This happens because at least one additional position measurement is carried out by determining position signals in the nearer region of the roll gap of the rolling stands. In particular, the position signals between the work rolls and / or the back-up rolls and / or the work roll chocks and / or the support roll chocks must be taken into account / determined.
  • the advantage of the method according to the invention is that the position measurement contains a smaller amount of framework expansion. So only the roll flattening and the roll bending are to be considered. Other parts, such as the elongation of the uprights and the crossheads, need not be calculated.
  • the method according to the invention leads to a more accurate determination of the strip thickness for hard grades and, especially during thin strip rolling, improves the dynamic behavior of the thickness control.
  • the signals obtained can also be used for position regulation and / or for swivel control and / or for calculating the strip thickness and thus for regulating the strip thickness.
  • Figure 2 is a flow chart for thickness control according to the invention.
  • Fig. 1 is a flow chart for the known thickness control during rolling, in particular during hot rolling, shown.
  • An example of a pair of work rolls AW and a pair of support rollers SW existing rolling stand W has an operating side OS and a drive side DS.
  • a strip B is located between the pair of work rolls AW.
  • the cylinder position of the operating side Sos and the cylinder position of the drive side S D s are determined and the current, mean cylinder position S AC T determined.
  • the total rolling force F A c ⁇ is ER- averaging the rolling force operating side Fos and the rolling force F drive side D s determined.
  • the gantry expansion g is calculated with the aid of the total rolling force F A c ⁇ and a gantry expansion curve 1 / M G.
  • the actual strip thickness h A c ⁇ is determined by measuring the current, average cylinder position S AC T and the calculated gantry strain g.
  • the actual strip thickness h A c ⁇ is compared with the strip thickness setpoint h REF and used for thickness control.
  • the thickness controller supplies the position setpoint for the cylinder position control.
  • the known thickness control according to the flowchart of Figure 2 is improved.
  • the distance between the work roll chocks on the operator side S ROS and on the drive side S S RD is, for example, measured and then the average distance of the work roll chocks S R determined.
  • the further determined value for the current, average cylinder position S A CT is compared directly with the cylinder position setpoint S REF .
  • the scaffold module M R depends according to the invention on the selected position measurement.
  • the position measurement position signals to be taken into account for the method, wherein at least one position signal is required, are provided between the work rolls AW and / or the backup rolls SW and / or the work roll chocks and / or the backup roll chocks determined.
  • the framework strain to be taken into account in the method according to the invention is to be matched in each case to the location of the position signal obtained.

Landscapes

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

Abstract

The invention relates to a method for thickness regulation during a rolling, especially hot-rolling, process, using at least one roll stand. The actual, average position of the adjustment cylinders of the roll stand and the total rolling force of the same are taken into account. According to the invention, at least one additional position measurement is carried out by the detection of position signals close to the roll gap of the roll stand.

Description

Verfahren zur Dickenregelung beim WarmwalzenMethod for thickness control during hot rolling
Die Erfindung betrifft ein Verfahren zur Dickenregelung beim Walzen, insbesondere beim Warmwalzen mit mindestens einem Walzgerüst, wobei u.a. die aktuelle, mittlere Position der Anstellzylinder des Walzgerüsts und die Sum- menwalzkraft derselben berücksichtigt werden.The invention relates to a method for thickness control during rolling, in particular during hot rolling with at least one roll stand, wherein u.a. the current, middle position of the setting cylinder of the roll stand and the cumulative rolling force of the same are taken into account.
Aus der DE 20 20 402 ist ein Verfahren zur Berechnung der Dicke G1 dünner, harter Werkstücke nach einem Reduzierdurchgang durch eine Reduzierwalzstrecke mit gegenüberliegenden Walzflächen und eine Messeinrichtung zur Messung der die Oberflächen auseinanderdrückenden Kräfte, die beim Durchgang des Werkstückes durch die gegenüberliegenden Walzflächen während eines Reduziervorganges erzeugt werden bekannt, bei dem: a) ein Signal erzeugt wird, das ein Maß für die Dicke G5 ist, die durch den Schnittpunkt einer geeigneten Walzendehnungskurve und einer geeigneten Werkstückverformungskurve für den Reduziervorgang festgelegt ist, b) ein Signal erzeugt wird, das ein Maß für eine Dicke G3 darstellt, die durch den Schnittpunkt der Kurve für die gemessene Kraft und die Walzendehnungskurve festgelegt ist, c) ein Signal erzeugt wird, das ein Maß für einen Unsicherheitsbereich darstellt, der durch die Differenz zwischen den Dicken G5 und G3 darstellenden Signalen bestimmt ist, d) ferner ein Signal erzeugt wird, das ein Maß für einen berechneten Streckungsfehler darstellt, indem das den Unsicherheitsbereich darstellende Signal als eine Funktion der für den Reduzierdurchgang vorausbestimmten Dickenabnahme, der für den Reduziervorgang vorausgesagten Walzendehnung und der relativen Fehlerwahrscheinlichkeit sowohl bei der Vorausbestimmung der Dickenabnahme als auch der Dehnung verändert wird, und e) ein Signal erzeugt wird, das ein Maß für die berechnete Dicke G1 ist, indem das die Dicke G3 darstellende Signal zu dem berechneten Dehnungsfehler hinzuaddiert wird.From DE 20 20 402 is a method for calculating the thickness G1 thin, hard workpieces after a Reduzierdurchgang by a Reduzierwalzstrecke with opposite rolling surfaces and a measuring device for measuring the forces apart the surfaces, during the passage of the workpiece through the opposite rolling surfaces during a Reduziervorganges A signal is generated, which is a measure of the thickness G5, which is determined by the intersection of a suitable roll elongation curve and a suitable workpiece deformation curve for the reduction process, b) a signal is generated which is a measure for a thickness G3 defined by the intersection of the measured force curve and the roll elongation curve, c) generating a signal representing a measure of an uncertainty region which determines the signals representing the difference between the thicknesses G5 and G3 is, d) f More specifically, a signal indicative of a calculated stretch error is generated by plotting the signal representing the uncertainty range as a function of the reduction predicted for the reduction pass, the rolling strain predicted for the reduction, and the relative error probability in both the prediction of the thickness decrease and the reduction Elongation is changed, and e) generating a signal indicative of the calculated thickness G1 by adding the signal representing the thickness G3 to the calculated strain error.
In der DE 26 57 455 A1 ist ein Verfahren zur Kompensation der Walzenverfor- mung an regelbar vorgespannten Walzgerüsten beschrieben, bei denen die Banddicke über hydraulische Stellglieder geregelt wird, und bei dem durch hydraulische Vorspannzylinder die Anstellkraft (F3) als Summe von Walzkraft und regelbarer Vorspannkraft nach der GleichungDE 26 57 455 A1 describes a method for compensating the roll deformation on controllably prestressed rolling stands, in which the strip thickness is regulated by hydraulic actuators, and in which by hydraulic prestressing cylinders the setting force (F 3 ) as the sum of rolling force and controllable Preload force according to the equation
F3 = (FaO + (Fr - Fr0)) * Ca/(C, + C3)F 3 = (FAO + (F r - Fr 0)) * C a / (C, + C 3)
derart verändert wird, dass zum Grundsollwert (Fao) der Anstellkraft ein Zusatzvollwert addiert wird, der aus der Differenz zwischen Istwert (Fr) der Vorspannkraft und Anfangswert (Fro) der Vorspannkraft gebildet wird und mit dem Ver- hältnis (ca /(c, + ca)) der Federsteifigkeit (ca) des äußeren Gerüstteiles zuris changed such that to the basic setpoint (F a o) of the adjusting force an additional complete value is added, which is formed from the difference between the actual value (F r ) of the biasing force and initial value (F r o) of the biasing force and with the ratio (c a / (c, + c a )) of the spring stiffness (c a ) of the outer frame part to
Summe der Federsteifigkeit des inneren (c,) und äußeren Gerüstteiles (ca) bewertet wird.Sum of the spring stiffness of the inner (c) and outer frame part (c a ) is evaluated.
Aus der DE 16 02 195 A1 ist ein Verfahren zur Berechnung der Dicke dünner harter Werkstücke bekannt.From DE 16 02 195 A1 a method for calculating the thickness of thin hard workpieces is known.
Dass ein Signal erzeugt wird, das ein Maß für die Dicke G5 ist, die durch den Schnittpunkt einer geeigneten Walzendehnungskurve und einer geeigneten Werkstückverformungskurve für den Reduziervorgang festgelegt ist, ein Signal erzeugt wird, das ein Maß für eine Dicke G3 darstellt, die durch den Schnittpunkt der Kurve für die gemessene Kraft und die Walzendehnungskurve festgelegt ist, ein Signal erzeugt wird, das ein Maß für einen Unsicherheitsbereich darstellt, der durch die Differenz zwischen den Dicken G5 und G3 darstellenden Signale bestimmt ist, ferner ein Signal erzeugt wird, das ein Maß für einen berechneten Streckungsfehler darstellt, indem das den Unsicherheitsbereich darstellende Signal als ei- ne Funktion der für den Reduzierdurchgang vorausgesagten Walzendehnung und der relativen Fehlerwahrscheinlichkeit sowohl bei der Vorausbestimmung de Dickenabnahme als auch der Dehnung verändert wird, und ein Signal erzeugt wird, das ein Maß für die berechnete Dicke G1 ist, indem das die Dicke G3 darstellende Signal zu dem berechneten Dehnungsfehler hinzu- addiert wird.That a signal is generated which is a measure of the thickness G5 defined by the intersection of a suitable roll elongation curve and a suitable workpiece deformation curve for the reduction process, a signal is generated which is a measure of a thickness G3 passing through the intersection the curve for the measured force and the roller extension curve is determined, a signal is generated which represents a measure of an uncertainty region, which is determined by the difference between the thickness G5 and G3 signals, and a signal is generated, which is a measure of represents a calculated extension error in that the signal representing the uncertainty region is a function of the rolling extension predicted for the reduction pass and the relative error probability in both the predetermination of the thickness decrease and the elongation is changed, and a signal is generated which is a measure of the calculated thickness G1 by the signal representing the thickness G3 calculated strain error is added.
Bisher wird für die Dickenregelung beim Wa im band walzen das sogenannte Gaugemeterprinzip zur Ermittlung der aktuellen Banddicke verwendet. Dazu wird die gemessene Position SDs. Sos der Anstellzylinder um die berechnete Gerüstdehnung g korrigiert (siehe auch Figur 1 ). Die Gerüstdehnung g wird mit Hilfe der gemessenen Walzkraft FDs, FOs und einer Gerüstdehnkurve 1/MG berechnet. Die so ermittelte Banddicke wird dann mit dem Dickensollwert verglichen und ausgeregelt. Für dieses Verfahren ist, neben den Messungen von Position und Walzkraft, ein genaues Gerüstmodell erforderlich.So far, the so-called Gaugemeterprinzip used to determine the current strip thickness for the thickness control when Wa in the roll. For this purpose, the measured position S D s. Sos the adjusting cylinder corrected by the calculated frame strain g (see also Figure 1). The framework strain g is calculated by means of the measured rolling force F D s, F O s and a framework expansion curve 1 / M G. The thus determined strip thickness is then compared with the thickness setpoint and compensated. For this process, apart from the measurements of position and rolling force, an exact framework model is required.
Beim Walzen von harten Güten und dünnen Bändern führen kleine Ungenauig- keiten im Gerüstmodell zu relativ großen Fehlern in der Banddicke und unter Umständen zur Instabilität der Dickenregelung.When rolling hard grades and thin tapes, small inaccuracies in the framework model lead to relatively large errors in the strip thickness and, under certain circumstances, to the instability of the thickness control.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Art derart zu verbessern, dass die oben aufgezeigten Nachteile vermieden werden.The invention is therefore based on the object to improve a method of the type described above such that the above-mentioned disadvantages are avoided.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Gerüstdeh- nungsanteil minimiert wird. Dieses geschieht dadurch, dass mindestens eine zusätzliche Positionsmessung durch Ermittlung von Positionssignalen im näheren Bereich des Walzspaltes der Walzgerüste durchgeführt wird. Hierbei sind insbesondere die Positionssignale zwischen den Arbeitswalzen und / oder den Stützwalzen und / oder den Arbeitswalzeneinbaustücken und / oder den Stütz- walzeneinbaustücken zu berücksichtigen / zu ermitteln. Der Vorteil des erfindungsgemäßen Verfahrens besteht darin, dass die Positionsmessung einen geringeren Gerüstdehnungsanteil enthält. So sind nur die Walzenabplattung und die Walzenbiegung zu berücksichtigen. Andere Anteile, wie die Dehnung der Ständer und der Querhäupter, müssen nicht berechnet werden. Speziell bei einer Messung des Abstandes der Arbeitswalzenbaustü- cke müssen die Aufschwemmung der Morgoil - Lager, die Biegung der Stützwalzen und Stützwalzenexzentrizitäten nicht berücksichtigt werden. Wie in Figur 2 dargestellt, wird das aus dem Stand der Technik bekannte Verfahren zur Dickenregelung weiterhin vollständig eingesetzt und durch die oben beschriebenen Merkmale verbessert bzw. erweitert.This object is achieved according to the invention by minimizing the amount of skeleton expansion. This happens because at least one additional position measurement is carried out by determining position signals in the nearer region of the roll gap of the rolling stands. In particular, the position signals between the work rolls and / or the back-up rolls and / or the work roll chocks and / or the support roll chocks must be taken into account / determined. The advantage of the method according to the invention is that the position measurement contains a smaller amount of framework expansion. So only the roll flattening and the roll bending are to be considered. Other parts, such as the elongation of the uprights and the crossheads, need not be calculated. Especially when measuring the distance of the work roll chocks, it is not necessary to take into account the Morgoil bearings' flooding, the deflection of the backup rolls and the support roll eccentricities. As shown in Figure 2, the method known from the prior art for thickness control is still fully used and improved or extended by the features described above.
Das erfindungsgemäße Verfahren führt zu einer genaueren Ermittlung der Banddicke bei harten Güten und verbessert speziell beim Dünnbandwalzen das dynamische Verhalten der Dickenregelung.The method according to the invention leads to a more accurate determination of the strip thickness for hard grades and, especially during thin strip rolling, improves the dynamic behavior of the thickness control.
In einer Weiterentwicklung können die erhaltenen Signale auch zur Positionsregelung und / oder zur Schwenkregelung und / oder zur Berechnung der Banddicke und damit zur Regelung der Banddicke verwendet werden.In a further development, the signals obtained can also be used for position regulation and / or for swivel control and / or for calculating the strip thickness and thus for regulating the strip thickness.
Ein Ausführungsbeispiel der Erfindung wird anhand von schematischen Zeichnungen näher beschrieben. Es zeigen:An embodiment of the invention will be described in more detail with reference to schematic drawings. Show it:
Figur 1 ein Ablaufdiagramm zur Dickenreglung nach dem Stand der1 shows a flow chart for the thickness control according to the prior
Technik undTechnology and
Figur 2 ein Ablaufdiagramm zur Dickenregelung gemäß der Erfindung.Figure 2 is a flow chart for thickness control according to the invention.
In Fig. 1 ist ein Ablaufdiagramm zur bekannten Dickenregelung beim Walzen, insbesondere beim Warmwalzen, dargestellt. Ein beispielsweise aus einem Arbeitswalzenpaar AW und einem Stützwalzenpaar SW bestehendes Walzgerüst W weist eine Bedienseite OS und eine Antriebsseite DS auf. Zwischen dem Arbeitswalzenpaar AW befindet sich ein Band B. Bei dem bekannten Verfahren zur Dickenregelung werden die Zylinderposition der Bedienseite Sos und die Zylinderposition der Antriebsseite SDs ermittelt und die aktuelle, mittlere Zylinderposition SACT bestimmt. Weiterhin wird die Summenwalzkraft FAcτ durch Er- mittlung der Walzkraft Bedienseite Fos und der Walzkraft Antriebsseite FDs bestimmt. Die Gerüstdehnung g wird mit Hilfe der Summenwalzkraft FAcτ und einer Gerüstdehnkurve 1/MG berechnet.In Fig. 1 is a flow chart for the known thickness control during rolling, in particular during hot rolling, shown. An example of a pair of work rolls AW and a pair of support rollers SW existing rolling stand W has an operating side OS and a drive side DS. A strip B is located between the pair of work rolls AW. In the known method for thickness control, the cylinder position of the operating side Sos and the cylinder position of the drive side S D s are determined and the current, mean cylinder position S AC T determined. Further, the total rolling force F A cτ is ER- averaging the rolling force operating side Fos and the rolling force F drive side D s determined. The gantry expansion g is calculated with the aid of the total rolling force F A cτ and a gantry expansion curve 1 / M G.
Die aktuelle Banddicke hAcτwird durch Messung der aktuellen, mittleren Zylinderposition SACT und der berechneten Gerüstdehnung g ermittelt. Die aktuelle Banddicke hAcτ wird mit dem Banddickensollwert hREF verglichen und zur Dickenregelung verwendet. Der Dickenregler liefert den Positionssollwert für die Zylinderpositionsregelung.The actual strip thickness h A cτ is determined by measuring the current, average cylinder position S AC T and the calculated gantry strain g. The actual strip thickness h A cτ is compared with the strip thickness setpoint h REF and used for thickness control. The thickness controller supplies the position setpoint for the cylinder position control.
Gemäß der Erfindung wird die bekannte Dickenregelung gemäß dem Ablauf- diagramm nach Figur 2 verbessert. Hierzu wird beispielsweise der Abstand der Arbeitswalzeneinbaustücke auf der Bedienseite SROS und auf der Antriebsseite SRDS gemessen und dann der mittlere Abstand der Arbeitswalzeneinbaustücke SR bestimmt. Der weiterhin ermittelte Wert für die aktuelle, mittlere Zylinderposition SACT wird direkt mit dem Zylinderpositionssollwert SREF verglichen.According to the invention, the known thickness control according to the flowchart of Figure 2 is improved. For this purpose, the distance between the work roll chocks on the operator side S ROS and on the drive side S S RD is, for example, measured and then the average distance of the work roll chocks S R determined. The further determined value for the current, average cylinder position S A CT is compared directly with the cylinder position setpoint S REF .
Die ebenfalls weiterhin ermittelten Werte der Walzkraft Bedienseite Fos und der Walzkraft Antriebsseite FDs führen zur Summenwalzkraft FAcτ- Diese werden erfindungsgemäß mit einem Gerüstmodul MR, der auf die Arbeitswalzeneinbaustücke bezogen ist, kombiniert und anschließend die Gerüstdehnung gR ermittelt.The likewise determined further values of the rolling force operating side Fos and the rolling force drive side F D s lead to the total rolling force F A cτ- these are inventively combined with a scaffold module M R , which is based on the work roll chocks, and then the gantry strain g R determined.
Das Gerüstmodul MR hängt erfindungsgemäß ab von der gewählten Positionsmessung. Die für das Verfahren zu berücksichtigenden Positionssignale der Positionsmessung, wobei mindestens ein Positionssignal benötigt wird, werden zwischen den Arbeitswalzen AW und / oder den Stützwalzen SW und / oder den Arbeitswalzeneinbaustücken und / oder den Stützwalzeneinbaustücken ermittelt. Die bei dem erfindungsgemäßen Verfahren zu berücksichtigende Gerüstdehnung ist jeweils auf den Ort des erhaltenen Positionssignals abzustimmen.The scaffold module M R depends according to the invention on the selected position measurement. The position measurement position signals to be taken into account for the method, wherein at least one position signal is required, are provided between the work rolls AW and / or the backup rolls SW and / or the work roll chocks and / or the backup roll chocks determined. The framework strain to be taken into account in the method according to the invention is to be matched in each case to the location of the position signal obtained.
Der Abstand auf der Bedienseite SROS und der Abstand auf der Antriebsseite SRDS führen zum mittleren Abstand der beispielsweise Arbeitswalzeneinbaustü- cke SR. AUS dem Abstand der Arbeitswalzeneinbaustücke SR und der Gerüstdehnung bezogen auf die Arbeitswalzeneinbaustücke gR wird die aktuelle Banddicke hAcτ ermittelt und mit dem Banddickensollwert hREF verglichen und ausgeregelt. The distance on the operating side SR OS and the distance on the drive side SRD S lead to the average distance of the example Arbeitswalzeneinbaustü- ck S R. From the distance of the work roll chocks S R and the frame strain with respect to the work roll chocks g R the actual tape thickness h A cτ is determined and compared with the band thickness setpoint h RE F and corrected.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
AW ArbeitswalzeAW stripper
SW StützwalzeSW support roller
W WalzgerüstW rolling stand
B BandB band
DS Antriebsseite OS BedienseiteDS drive side OS operating side
FACT SummenwalzkraftF A C T Total rolling force
Fos Walzkraft BedienseiteFos rolling force control side
FDS Walzkraft AntriebsseiteF D S rolling force drive side
SACT aktuelle, mittlere Zylinderposition Sos Zylinderposition BedienseiteSA CT current, middle cylinder position Sos cylinder position operating side
SDS Zylinderposition AntriebsseiteSDS cylinder position drive side
SREF ZylinderpositionssollwertS REF cylinder position setpoint
ΓIACT aktuelle Banddicke hREF Banddickensollwert SR mittlerer Abstand der ArbeitswalzenbaustückeΓIAC T actual strip thickness hREF strip thickness setpoint S R mean distance between the work roll sections
SROS Abstand BedienseiteS R OS distance operating side
SRDS Abstand Antriebsseite gR Gerüstdehnung bezogen auf ArbeitswalzenbaustückeS RD S Distance of drive side g R Framework strain related to work roll chocks
MR Gerüstmodel bezogen auf Arbeitswalzenbaustücke g GerüstdehnungMR scaffolding model based on work roll chocks g Scaffold elongation
MG Gerüstmodul M G scaffolding module

Claims

Patentansprüche claims
1. Verfahren zur Dickenregelung beim Walzen, insbesondere beim Warmwalzen mit mindestens einem Walzgerüst, wobei u.a. die aktuelle, mittlere Position der Anstellzylinder des Walzgerüsts und die Summenwalzkraft derselben berücksichtigt werden, dadurch gekennzeichnet, dass mindestens eine zusätzliche Positionsmessung durch Ermittlung von Positionssignalen im näheren Bereich des Walzspaltes der Walzgerüste durchgeführt wird.1. A method for thickness control during rolling, in particular during hot rolling with at least one roll stand, wherein u.a. the current, middle position of the setting cylinder of the roll stand and the sum rolling force thereof are taken into account, characterized in that at least one additional position measurement is carried out by determining position signals in the nearer region of the rolling gap of the rolling stands.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Positionssignale zwischen den Arbeitswalzen und / oder den Stützwalzen und / oder den Arbeitswalzeneinbaustücken und / oder den Stützwalzeneinbaustücken ermittelt werden.2. The method according to claim 1, characterized in that the position signals between the work rolls and / or the backup rolls and / or the work roll chocks and / or the backup roll chocks are determined.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Positionssignale zur Positionsregelung verwendet wer- den.3. The method according to claim 1 or 2, characterized in that the position signals are used for position control.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Positionssignale zur Schwenkregelung verwendet wer- den. 4. The method according to any one of claims 1 to 3, characterized in that the position signals are used for the swivel control.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Positionssignale zur Berechnung der Banddicke verwendet werden. 5. The method according to any one of claims 1 to 4, characterized in that the position signals are used to calculate the strip thickness.
EP06776361A 2005-08-26 2006-07-24 Method for thickness regulation during a hot-rolling process Withdrawn EP1919638A1 (en)

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DE102005040690 2005-08-26
DE102005042837A DE102005042837A1 (en) 2005-08-26 2005-09-09 Method for thickness control during hot rolling
PCT/EP2006/007249 WO2007022841A1 (en) 2005-08-26 2006-07-24 Method for thickness regulation during a hot-rolling process

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