EP0947265B1 - Process for continuous casting and finish rolling of a cast strand within a predetermined net width - Google Patents

Process for continuous casting and finish rolling of a cast strand within a predetermined net width Download PDF

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Publication number
EP0947265B1
EP0947265B1 EP99106087A EP99106087A EP0947265B1 EP 0947265 B1 EP0947265 B1 EP 0947265B1 EP 99106087 A EP99106087 A EP 99106087A EP 99106087 A EP99106087 A EP 99106087A EP 0947265 B1 EP0947265 B1 EP 0947265B1
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EP
European Patent Office
Prior art keywords
width
strip
setting
slab
finished
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EP99106087A
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German (de)
French (fr)
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EP0947265A2 (en
EP0947265A3 (en
Inventor
Jürgen Seidel
Karl-Ernst Dr. Hensger
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SMS Siemag AG
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SMS Demag AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • the invention relates to a method for continuous casting and finish rolling of a casting slab within a given finished width tolerance, wherein for the casting slab and occasionally a follow-up ram an adjustment of the mold position especially made in accordance with different rolling conditions becomes.
  • the technology of casting thin slabs used with great advantage enables continuous casting with continuous casting formats between approx. 30 and 100 mm thickness at 800 to 2200 mm width and preferably direct rolling with Compared to conventional production processes considerably reduced forming work in a rolling mill, with the production chain from crude steel to Walzer product is significantly shortened.
  • a corresponding prior art shows the device according to EP-OS 0 149 734.
  • This document is a mold for continuous casting thin slabs with cooled broadside walls and narrow side walls, wherein the broad side walls limited to only a part of the mold height, funnel-shaped Eingello Scheme form, to the narrow sides and in the casting direction reduced to the format of the cast slab.
  • the broadside walls laterally of the funnel-shaped Eingello Schemees run in one of Slab thickness corresponding distance parallel, up to the respective narrow side wall forming a parallel area extending from the pouring area.
  • the narrow side walls are in the parallel region of the broad side walls adjustable. The adjustment, for example, the width of thin slabs u.a. also from DE 35 01 422 C2 known.
  • the invention has the object based, a method referred to in the preamble of claim 1.
  • the inventive method of width optimization can both in a multi-stand system, as well as in a reversing stand with several Find stitches application.
  • the actuators of Finishing line relieved and the finished width by presetting the mold slab used for slab.
  • Slab width is that preferably the finishing line actuators for the Width setting can be used.
  • the surface quality or the casting speed to avoid a change in the mold position or the Verstellbeträge or frequency to minimize, become the effective parameters of the finishing train used for the width so that the desired (often the same) finished tape width within the tolerance arises (see explanations to Fig. 3).
  • An embodiment of the method provides that the width preset for the Kokillenstellglieder and the finishing line actuators (preset) made so is that for each rolled strip about the middle of the tolerance band of the Finished width results.
  • a width presetting is made on the mold and at the same time the adjustment can be withdrawn in the rolling mill.
  • the method according to the invention provides that by comparing the measured width of the casting slab with the calculated slab width an adaptation correction coefficient won and to correct the Breitungsmodelles is used.
  • a width error measured in the area of the casting machine can be applied to the Breitungsmodell be switched to the finishing train.
  • the minimum / maximum Setting ranges of the finished road links are determined so that only after reaching minimum or maximum adjustment ranges of the finishing road actuators one Change the mold position is made.
  • the diagram lines in the upper area of FIG. 1 show a stitch plan with a larger number of coils, with the thicknesses of the products of individual coils between 1 and 3 mm vary.
  • the lower diagram shows that, when the position is kept constant the Kokille set themselves significantly different bandwidths.
  • the hatched Surfaces below the bandwidth line give the thickness of the rolled strip resulting overwidths. It can be seen that with increasing thickness a rolled strip whose width decreases disproportionately. It turns out the conclusion that for each finished strip a calculation of the necessary mold width must be carried out, and for the associated instantaneous cast slab or for the present slab.
  • a width adjustment The mold of slab to slab is required, as is the dependence between strip thickness and width can be read from the diagrams of FIG. 1, to the width of, for example. 1 mm strip thickness rolled strip within the tolerance width Tol, i. to lie under the hatched area.
  • the maximum permissible strip dimensions of a planned production program are considered and the effective parameters ( ⁇ W) of the finishing train are used in the direction of spreading or constriction. If the input width (B BR ) is present, then according to the flowchart of FIG. 2, the finishing line effect parameters ( ⁇ W) for the bandwidth corresponding to the claimed fine adjustment order are used such that the difference between the calculated tape width and the target width is less than Compliance with plant and material limits is minimized.
  • the width of the rolled strip is checked to see whether it is within the permissible range. If so, then there is no iteration of the optimization measures. If not, iteratively, ie step by step, the finishing-line parameters are changed.
  • the finishing line adjustment consisting of pass plan model 10, contour model 11 and spreading model 12 is restarted both for the width change (12a) on the casting machine (Caster C) and for the change in width (FIG. 12b) in the finishing line F.
  • This iteration loop is called up until the possibilities of changing the finishing-line effective parameters ⁇ W have been exhausted.
  • the designations B F1-n denote the bandwidths between the individual stands of the finishing train.
  • the flowchart further shows that an adaptation value 13 is obtained by comparing the measured width of the casting slab B BR with the calculated slab width (12 a). Also, the measured bandwidth 16 is used compared to the calculated bandwidth 14 for a correction value and applied to the spreading model 12. When the effective finished width B F is reached, the iteration for the change of the finishing line effective parameters is finished and the correct finished product needs no further corrections.
  • the mold width B K is chosen such that for the finished product 2, the bandwidth B F2 is in the hatched tolerance window or equal to the target width B Z , then often result for the finished product 1 with the same mold width excess width B F1 .
  • the width effective ranges W 1 , W 2 of the finishing line actuators for both finished products 2 and 1 are then determined.
  • the mean value B M between the maximum possible finished width B F2 and the minimum possible finished width B F1 is determined.
  • the optimized widths B ' F1 result with the use of the finishing line actuators .
  • B 'F2 both of which are within tolerance window width ⁇ B. If the finished width B ' F2 lies below the minimum width tolerance limit, ie in the impermissible range, then the mold width must be corrected by this amount.

Abstract

The mold width is preset with the limiting values of the final strip width. For each new cast strip calculations are carried out for optimal application of the control elements of the mold and the finish rolling section. With the width of the cast strip at the entry into the finish rolling section known, additional optimization of the final strip width is undertaken using the control elements of the finish rolling section.

Description

Die Erfindung betrifft ein Verfahren zum Stranggießen und Fertigwalzen einer Gießbramme innerhalb einer vorgegebenen Fertigbreitentoleranz, wobei für die Gießbramme und fallweise eine Folgebramme eine Einstellung der Kokillenposition insbesondere nach Maßgabe unterschiedlicher Walzbedingungen vorgenommen wird.The invention relates to a method for continuous casting and finish rolling of a casting slab within a given finished width tolerance, wherein for the casting slab and occasionally a follow-up ram an adjustment of the mold position especially made in accordance with different rolling conditions becomes.

Die mit großem Vorteil angewendete Technologie des Gießens dünner Brammen ermöglicht das Stranggießen mit Stranggussformaten zwischen ca. 30 und 100 mm Dicke bei 800 bis 2200 mm Breite und ein bevorzugt direktes Auswalzen mit gegenüber konventionellen Produktionsverfahren erheblich verringerter Umformarbeit in einer Walzstraße, wobei die Produktionskette vom Rohstahl bis zum Walzerzeugnis erheblich verkürzt ist.The technology of casting thin slabs used with great advantage enables continuous casting with continuous casting formats between approx. 30 and 100 mm thickness at 800 to 2200 mm width and preferably direct rolling with Compared to conventional production processes considerably reduced forming work in a rolling mill, with the production chain from crude steel to Walzer product is significantly shortened.

Bei dieser Technologie werden zunehmend höhere Anforderungen an die einzuhaltenden Breitentoleranzen des Fertigproduktes gefordert.With this technology, increasingly higher demands are to be met Width tolerances of the finished product required.

Es ist allgemein bekannt, Brammen-Kokillen zur Einstellung eines vorgegebenen Brammen-Formates mit verstellbaren Breitseiten- und/oder Schmalseitenwänden sowie mit zugehörigen mechanischen bzw. hydraulischen Stellgliedern auszurüsten.It is well known slab molds for setting a given Slab formats with adjustable broadside and / or narrow side walls and equip with associated mechanical or hydraulic actuators.

Einen entsprechenden Stand der Technik zeigt die Vorrichtung nach der EP-OS 0 149 734. Es handelt sich bei diesem Dokument um eine Kokille zum Stranggießen von Dünnbrammen mit gekühlten Breitseitenwänden und Schmalseitenwänden, wobei die Breitseitenwände einen nur auf einen Teil der Kokillenhöhe beschränkten, trichterförmigen Eingießbereich bilden, der zu den Schmalseiten und in Gießrichtung auf das Format der gegossenen Bramme reduziert ist. Die Breitseitenwände seitlich des trichterförmigen Eingießbereiches verlaufen in einem der Brammendicke entsprechenden Abstand parallel, bis zu der jeweiligen Schmalseitenwand unter Bildung eines jeweils vom Eingießbereich ausgehenden Parallelbereichs. Die Schmalseitenwände sind im Parallelbereich der Breitseitenwände verstellbar. Die Verstellung bspw. der Breite von Dünnbrammen ist u.a. auch aus der DE 35 01 422 C2 bekannt.A corresponding prior art shows the device according to EP-OS 0 149 734. This document is a mold for continuous casting thin slabs with cooled broadside walls and narrow side walls, wherein the broad side walls limited to only a part of the mold height, funnel-shaped Eingießbereich form, to the narrow sides and in the casting direction reduced to the format of the cast slab. The broadside walls laterally of the funnel-shaped Eingießbereiches run in one of Slab thickness corresponding distance parallel, up to the respective narrow side wall forming a parallel area extending from the pouring area. The narrow side walls are in the parallel region of the broad side walls adjustable. The adjustment, for example, the width of thin slabs u.a. also from DE 35 01 422 C2 known.

Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren der im Oberbegriff von Anspruch 1 genannten Art weiter zu entwickeln, um bei stranggegossenen und gewalzten Dünnbrammen die Einhaltung enger Breitentoleranzen beim Fertigband einhalten zu können.Based on the aforementioned prior art, the invention has the object based, a method referred to in the preamble of claim 1. Art to develop in continuous casting and rolled thin slabs compliance to be able to comply with narrow width tolerances on the finished strip.

Zur Lösung der Aufgabe wird mit der Erfindung vorgeschlagen,

  • dass zur Erzielung der vorgegebenen Fertigbreite des Walzbandes innerhalb eines Toleranzbandes zunächst eine Voreinstellung der Kokillenposition unter Berücksichtigung der extremen Bandabmessungen des geplanten Produktionsprogrammes vorgenommen wird und
  • für jede Gießbramme und fallweise eine Folgebramme eine Berechnung für die Soll-Einstellung der Kokillen-Stellglieder und der Stellglieder der Fertigstraße vorgenommen, und
  • dass bei vorliegender Breite der Gießbramme beim Eingang in die Fertigstraße eine Feineinstellung der Fertigbreite des Walzbandes mit Hilfe der Stellglieder der Fertigstraße vorgenommen wird,
  • dass die Stellglieder der Kokille entsprechend der rechnerisch ermittelten SOLL-Einstellung vor dem Gießen der Folgebramme angefahren werden, und dass der Berechnung der Kokillen-Stellglieder und/oder der Fertigstraßen-Stellglieder ein Stichplanmodell, ein Konturmodell und ein Breitungsmodell zugrunde gelegt werden, und vor dem Walzen der Folgebramme die durch Rechnung ermittelte SOLL-Einstellung der Fertigstraßen-Stellglieder angefahren wird.
To solve the problem is proposed with the invention,
  • that in order to achieve the predetermined finished width of the rolled strip within a tolerance band, a default setting of the mold position taking into account the extreme strip dimensions of the planned production program is made and
  • for each casting slab and occasionally a follow-up ram, a calculation is made for the target setting of the mold actuators and the final-section actuators; and
  • that at the present width of the casting slab on entry into the finishing line a fine adjustment of the finished width of the rolled strip is made by means of the actuators of the finishing train,
  • in that the actuators of the mold are approached according to the calculated SETPOINT setting prior to the casting of the follower ram, and that the calculation of the mold actuators and / or the finishing line actuators are based on a passplan model, a contour model and a spreading model, and before Rolling of the following ram the determined by calculation target setting of the finishing line actuators is approached.

Mit Vorteil gliedert sich das erfindungsgemäße Verfahren der Breitenoptimierung einer stranggegossenen Dünnbramme in die Schritte:

  • a) Erzeugen der Brammenbreite bzw. Bestimmen der Kokillenposition und gegebenenfalls auch der Vorbandbreite einer konventionellen Straße, sowie
  • b) Fein-Einstellung der Fertigstraßenstellglieder bei vorliegender Eingangsbreite.
    • Advantageously, the inventive method of width optimization of a continuously cast thin slab is divided into the steps:
  • a) generating the slab width or determining the Kokillenposition and possibly also the Vorbandbreite a conventional road, and
  • b) fine adjustment of the finishing road actuators at existing entrance width.

    • Dies gilt sowohl für Dünnbrammen-Fertigstraßen, wie auch für konventionelle Fertigstraßen. Das erfindungsgemäße Verfahren der Breitenoptimierung kann sowohl in einer mehrgerüstigen Anlage, als auch bei einem Reversiergerüst mit mehreren Stichen Anwendung finden.This applies both to thin slab finishing lines and to conventional finishing lines. The inventive method of width optimization can both in a multi-stand system, as well as in a reversing stand with several Find stitches application.

    Bei einer möglichen Fahrweise gemäß der Erfindung werden die Stellglieder der Fertigstraße entlastet und die Fertigbreite durch Voreinstellung der Kokille Bramme für Bramme angefahren.In a possible driving manner according to the invention, the actuators of Finishing line relieved and the finished width by presetting the mold slab used for slab.

    Ein weiterer Anwendungsfall zwecks der erfindungsgemäßen Optimierung für die Brammenbreite besteht darin, dass bevorzugt die Fertigstraßenstellglieder für die Breiteneinstellung verwendet werden.Another application for the purpose of optimizing for the invention Slab width is that preferably the finishing line actuators for the Width setting can be used.

    Um aus übergeordneten Gründen, bspw. der Oberflächenqualität oder der Gießgeschwindigkeit, eine Änderung der Kokillenposition zu vermeiden oder die Verstellbeträge bzw. -häufigkeit zu minimieren, werden die Wirkparameter der Fertigstraße für die Breite so eingesetzt, dass die gewünschte (oft gleiche) Fertigbandbreite innerhalb der Toleranz entsteht (siehe Erläuterungen zu Fig. 3). For reasons of higher importance, for example the surface quality or the casting speed, to avoid a change in the mold position or the Verstellbeträge or frequency to minimize, become the effective parameters of the finishing train used for the width so that the desired (often the same) finished tape width within the tolerance arises (see explanations to Fig. 3).

    Eine Ausgestaltung des Verfahrens sieht vor, dass die Breitenvoreinstellung für die Kokillenstellglieder und die Fertigstraßen-Stellglieder (Preset) so vorgenommen wird, dass sich für jedes Walzband etwa die Mitte des Toleranzbandes der Fertigbreite ergibt.An embodiment of the method provides that the width preset for the Kokillenstellglieder and the finishing line actuators (preset) made so is that for each rolled strip about the middle of the tolerance band of the Finished width results.

    Weiterhin sieht das Verfahren nach der Erfindung vor,

    • dass vor der Produktion einer neuen Gießbramme eine Band-Kontur-Berechnung und eine Stichplanberechnung sowie das Breitungsmodell angestoßen werden, wonach
    • eine entsprechende Voreinstellung der Kokillen-Stellglieder vorgenommen wird,
    • anschließend die effektive Breite des fertig gewalzten Bandes gemessen, und
    • das Ergebnis einer fallweise erforderlichen Korrektur des Breitungsmodells und damit der Berechnung der Fertigstraßen-Stellglieder zugrunde gelegt wird.
    Furthermore, the method according to the invention provides
    • that before the production of a new casting slab, a strip contour calculation and a stitch plan calculation as well as the spreading model are triggered, according to which
    • a corresponding presetting of the mold actuators is made,
    • then the effective width of the finished rolled strip is measured, and
    • the result of occasionally required correction of the Breitungsmodells and thus the calculation of the finishing line actuators is based.

    Mit Vorteil wird durch das erfindungsgemäße Produktionssteuerungssystem erreicht, dass eine Breitenvoreinstellung an der Kokille vorgenommen wird und gleichzeitig die Verstellbereiche in der Walzstraße zurückgenommen werden können.Advantageously, it is achieved by the production control system according to the invention, that a width presetting is made on the mold and at the same time the adjustment can be withdrawn in the rolling mill.

    Eine weitere Ausgestaltung des Verfahrens sieht vor, dass für einen optimalen Einsatz der Stellglieder für Kokille und Fertigstraße zur Erzielung hoher Genauigkeit ein Breitungsmodell als Grundlage für eine Voreinstellung verwendet wird, das wenigstens die folgenden Einflüsse berücksichtigt:

    • Breitenänderung zwischen Kokille und Austritt aus der Gießmaschine (Caster)
    • Temperaturschrumpf von der Gießmaschine (Caster) bis zum Fertigband
    • Bandzüge innerhalb der Fertigstraße
    • Konturänderungen der Brammenform bis hin zur Fertigbandform
    • Planheitszustand des Bandes zwischen den Fertiggerüsten
    • natürliche Breitung des Bandes, Dicke des Bandes
    • Walzgeschwindigkeit, Walztemperatur
    • Materialqualität des Bandes
    • Stauchabnahme
    • Brammen- bzw. Vorbandkontur (als Meß- oder Rechenwert).
    A further embodiment of the method provides that, for optimal use of the actuators for mold and finishing train to achieve high accuracy, a Breitungsmodell is used as a basis for a default, which takes into account at least the following influences:
    • Width change between mold and exit from the caster
    • Temperature shrinkage from the casting machine (caster) to the finished strip
    • Band hoops inside the finishing train
    • Contour changes of the slab shape up to the finished strip shape
    • Flatness condition of the strip between the finishing stands
    • natural spread of the band, thickness of the band
    • Rolling speed, rolling temperature
    • Material quality of the tape
    • upsetting loss
    • Slab or pre-band contour (as measured or calculated value).

    Weiterhin sieht das Verfahren nach der Erfindung vor, dass durch Vergleich der gemessenen Breite der Gießbramme mit der berechneten Brammenbreite ein Adaptions-Korrekturkoeffizient gewonnen und zur Korrektur des Breitungsmodelles verwendet wird.Furthermore, the method according to the invention provides that by comparing the measured width of the casting slab with the calculated slab width an adaptation correction coefficient won and to correct the Breitungsmodelles is used.

    Auch kann ein im Bereich der Gießmaschine gemessener Breitenfehler auf das Breitungsmodell der Fertigstraße aufgeschaltet werden.Also, a width error measured in the area of the casting machine can be applied to the Breitungsmodell be switched to the finishing train.

    Mit dem Verfahren nach der Erfindung ist weiterhin vorgesehen, dass zur Fein-Einstellung der Fertigbreite des gewalzten Bandes in der Fertigstraße die folgenden Wirkparameter in der angegebenen Rangfolge berücksichtigt und derart eingesetzt werden, dass die Differenz zwischen der errechneten Breite und der Zielbreite minimiert wird:

    • Änderung der Abnahmeverteilung in der Straße
    • Änderung des Zielprofils im Rahmen des Profiltoleranzbandes
    • Änderung der Zugspannung zwischen den Gerüsten
    • Einsatz eines Stauchers
    • Änderung der aktiven Gerüstzahl oder der Stichanzahl.
    With the method according to the invention, it is further provided that, for the fine adjustment of the finished width of the rolled strip in the finishing train, the following effective parameters are considered in the given order of priority and used in such a way that the difference between the calculated width and the target width is minimized:
    • Change of the decrease distribution in the street
    • Change of the target profile within the profile tolerance band
    • Change of tension between the scaffolds
    • Use of a stuffer
    • Change of active skeleton number or number of stitches.

    Und schließlich ist mit dem Verfahren vorgesehen, dass zur Erweiterung des Toleranzbereiches für die Einstellung der Kokillenposition die minimalen/maximalen Stellbereiche der Fertigstraßenglieder ermittelt werden, so dass erst nach Erreichen minimaler oder maximaler Stellbereiche der Fertigstraßenstellglieder eine Änderung der Kokillenposition vorgenommen wird.And finally, with the procedure provided that for extending the tolerance range for setting the mold position the minimum / maximum Setting ranges of the finished road links are determined so that only after reaching minimum or maximum adjustment ranges of the finishing road actuators one Change the mold position is made.

    Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung einiger in Zeichnungen diagrammatisch dargestellter Beispiele. Es zeigen:

    Figur 1
    ein Walzprogramm mit einer Anzahl Coils unterschiedlicher Banddicke und daraus resultierender unterschiedlicher Fertigbreite bei konstant eingestellter Kokillenposition (dargestellt anhand einer bekannten CSP-Anlage);
    Figur 2
    ein Berechnungsmodell zur Bestimmung und zur Fein-Einstellung der Bandbreite;
    Figur 3
    Diagramme gleicher Kokillenbreite für unterschiedliche Fertigprodukte mit und ohne Optimierungsverfahren.
    Further details, features and advantages of the invention will become apparent from the following explanation of some diagrammatically illustrated examples in drawings. Show it:
    FIG. 1
    a rolling program with a number of coils of different strip thickness and resulting different finished width with constant set mold position (shown using a known CSP system);
    FIG. 2
    a calculation model for determining and fine-tuning the bandwidth;
    FIG. 3
    Diagrams of the same mold width for different finished products with and without optimization method.

    Zum besseren Verständnis werden zunächst die Zeichnungen in den Figuren 1 bis 3 wie folgt erläutert: Figur 1 dF(mm) = Fertigbanddicke ΔBF(mm) = Breitenabweichung Tol = max. Toleranzbreite des Walzbandes BFSoll = SOLL-Fertigbreite des Walzbandes Ww = Walzenwechsel Figur 2 BK = Kokillenbreite/Vorbandbreite (Kopf/Ende) BF = eff. Fertigbreite des Walzbandes BF1-n = Bandbreiten zwischen den Gerüsten BBR = gemessene Brammenbreite Δ W = Änderung der Fertigstraßen-Wirkparameter 10 = Stichplan-Modell 11 = Kontur-Modell 12 = Breitungs-Modell (C = Caster = Gießmaschine; F = Fertigstraße) 13 = Adaption Gießmaschinenbreite 14 = Adaption Bandbreite 15 = Position Seitenführungen 16 = gemessene Fertigbreite des Walzbandes Figur 3 BK1; BK2 = Kokillenbreite ohne Optimierung BKopt = Kokillenbreite mit Optimierung W1; W2 = Wirkglieder-Stellbereich der Fertigstraße St = Einfluß der Stellglieder BF1; BF2 = Fertigbandbreiten ohne Optimierung B'F1; B'F2 = Fertigbandbreiten mit Optimierung BZ = Zielbreite Δ B = Breitentoleranz des Walzbandes Δ Bopt = Breitendifferenz der Kokille zwischen den Positionen mit und ohne Optimierung BM = Mittelwert zwischen max. möglicher Fertigbreite BF2 und min. möglicher Fertigbreite BF1 Index 1 = Fertigprodukt 1 Index 2 = Fertigprodukt 2 For a better understanding, the drawings in FIGS. 1 to 3 will first be explained as follows: FIG. 1 d F (mm) = Finished strip thickness ΔB F (mm) = width deviation Tol = Max. Tolerance width of the rolled strip B FSoll = DESIRED ready width of the rolled strip Ww = roll change FIG. 2 B K = Mold width / pre-width (head / end) B F = eff. Finished width of the rolled strip B F1-n = Bandwidths between the scaffolds B BR = measured slab width ΔW = Modification of the finishing line effect parameters 10 = Pass schedule model 11 = Contour model 12 = Breitungs model (C = caster = casting machine, F = finishing line) 13 = Adaptation casting machine width 14 = Adaptation bandwidth 15 = Position side guides 16 = measured finished width of the rolled strip FIG. 3 B K1 ; B K2 = Mold width without optimization B Kopt = Mold width with optimization W 1 ; W 2 = Actuator setting range of the finishing train St = Influence of the actuators B F1 ; B F2 = Finished bandwidths without optimization B 'F1; B ' F2 = Finished bandwidths with optimization B Z = target width Δ B = Width tolerance of the rolled strip Δ Bopt = Width difference of the mold between the positions with and without optimization B M = Mean value between max. possible finished width B F2 and min. possible finished width B F1 Index 1 = Finished product 1 Index 2 = Finished product 2

    Die Diagrammlinien im oberen Bereich der Fig. 1 zeigen einen Stichplan mit einer größeren Anzahl von Coils, wobei die Dicken der Produkte einzelner Coils zwischen 1 und 3 mm variieren. The diagram lines in the upper area of FIG. 1 show a stitch plan with a larger number of coils, with the thicknesses of the products of individual coils between 1 and 3 mm vary.

    In den unteren Diagrammlinien zeigt sich, dass bei konstant gehaltener Position der Kokille sich erheblich unterschiedliche Bandbreiten einstellen. Die schraffierten Flächen unter der Bandbreitenlinie geben die bei geringer Dicke des Walzbandes entstehenden Überbreiten an. Hieraus ist erkennbar, dass mit zunehmender Dicke eines gewalzten Bandes dessen Breitung überproportional abnimmt. Es ergibt sich die Folgerung, dass für jedes Fertigband eine Berechnung der notwendigen Kokillenbreite durchgeführt werden muß, und zwar für die dazugehörige augenblicklich gegossene Bramme bzw. für die vorliegende Bramme. Eine Breitenverstellung der Kokille von Bramme zu Bramme ist erforderlich, wie dies aus der Abhängigkeit zwischen Banddicke und Breitung aus den Diagrammen von Fig. 1 ablesbar ist, um mit der Breite eines bspw. auf 1 mm Banddicke ausgewalzten Bandes innerhalb der Toleranzbreite Tol, d.h. unter der schraffierten Fläche zu liegen.The lower diagram shows that, when the position is kept constant the Kokille set themselves significantly different bandwidths. The hatched Surfaces below the bandwidth line give the thickness of the rolled strip resulting overwidths. It can be seen that with increasing thickness a rolled strip whose width decreases disproportionately. It turns out the conclusion that for each finished strip a calculation of the necessary mold width must be carried out, and for the associated instantaneous cast slab or for the present slab. A width adjustment The mold of slab to slab is required, as is the dependence between strip thickness and width can be read from the diagrams of FIG. 1, to the width of, for example. 1 mm strip thickness rolled strip within the tolerance width Tol, i. to lie under the hatched area.

    Wie das Flußdiagramm der Fig. 2 zeigt, besteht eine Optimierungsaufgabe für die Bandfertigbreite darin, bevorzugt die Fertigstraßenstellglieder für die Breiteneinstellung zu verwenden. Um für die Kokille die Häufigkeit der Verstellung der Kokillenverstellglieder zu minimieren oder deren Verstellung zu vermeiden, werden die Wirkparameter (ΔW) der Fertigstraße so eingesetzt, dass die gewünschte Fertigbandbreite innerhalb der vorgegebenen Toleranz eingehalten wird.As the flow chart of Fig. 2 shows, there is an optimization task for the Belt width in it, preferably the finishing road actuators for the width adjustment to use. For the mold, the frequency of adjustment of Kokillenverstellglieder to minimize or avoid their misalignment the effective parameters (ΔW) of the finishing train are used so that the desired finished bandwidth within the specified tolerance.

    Bei der Optimierung werden die maximal zulässigen Bandabmessungen eines geplanten Produktionsprogrammes betrachtet und die Wirkparameter (ΔW) der Fertigstraße in Richtung Breitung bzw. Einschnürung eingesetzt. Liegt die Eingangsbreite (BBR) vor, so werden gemäß dem Flußdiagramm nach Fig. 2 die Fertigstraßen-Wirkparameter (ΔW) für die Bandbreite entsprechend der beanspruchten Rangfolge zur Fein-Einstellung so eingesetzt, dass die Differenz zwischen der gerechneten Bandfertigbreite und der Zielbreite unter Beachtung der Anlagen- und Materialgrenzen minimiert wird. During optimization, the maximum permissible strip dimensions of a planned production program are considered and the effective parameters (ΔW) of the finishing train are used in the direction of spreading or constriction. If the input width (B BR ) is present, then according to the flowchart of FIG. 2, the finishing line effect parameters (ΔW) for the bandwidth corresponding to the claimed fine adjustment order are used such that the difference between the calculated tape width and the target width is less than Compliance with plant and material limits is minimized.

    Dabei wird ausgehend von einer Voreinstellung einer Standard-Fertigstraße die Breite des gewalzten Bandes überprüft, ob diese im zulässigen Bereich liegt. Wenn ja, dann findet keine Iteration der Optimierungsmaßnahmen statt. Wenn nein, dann werden iterativ, d.h. Schritt für Schritt, die Fertigstraßenparameter geändert. Nach Festlegung der Änderung erfolgt ein erneutes Anstoßen der Fertigstraßeneinstellung bestehend aus Stichplan-Modell 10, Kontur-Modell 11 und Breitungs-Modell 12, und zwar sowohl für die Breitenänderung (12a) an der Gießmaschine (Caster C), als auch für die Breitenänderung (12b) in der Fertigstraße F. Diese Iterationsschleife wird so oft aufgerufen, bis die Änderungs-Möglichkeiten der Fertigstraßen-Wirkparameter Δ W ausgeschöpft sind. Mit der Bezeichnung BF1-n sind die Bandbreiten zwischen den einzelnen Gerüsten der Fertigstraße bezeichnet. Das Flußdiagramm zeigt ferner, dass durch Vergleich der gemessenen Breite der Gießbramme BBR mit der errechneten Brammenbreite (12a) ein Adaptionswert 13 gewonnen wird. Ebenfalls wird die gemessene Bandbreite 16 im Vergleich zur errechneten Bandbreite 14 für einen Korrekturwert verwendet und dem Breitungsmodell 12 aufgeschaltet. Bei Erreichen der effektiven Fertigbreite BF ist die Iteration für die Änderung der Fertigstraßen-Wirkparameter beendet und das korrekte Fertigprodukt bedarf keiner weiteren Korrekturen.In this case, based on a default setting of a standard finishing line, the width of the rolled strip is checked to see whether it is within the permissible range. If so, then there is no iteration of the optimization measures. If not, iteratively, ie step by step, the finishing-line parameters are changed. After the change has been made, the finishing line adjustment consisting of pass plan model 10, contour model 11 and spreading model 12 is restarted both for the width change (12a) on the casting machine (Caster C) and for the change in width (FIG. 12b) in the finishing line F. This iteration loop is called up until the possibilities of changing the finishing-line effective parameters Δ W have been exhausted. The designations B F1-n denote the bandwidths between the individual stands of the finishing train. The flowchart further shows that an adaptation value 13 is obtained by comparing the measured width of the casting slab B BR with the calculated slab width (12 a). Also, the measured bandwidth 16 is used compared to the calculated bandwidth 14 for a correction value and applied to the spreading model 12. When the effective finished width B F is reached, the iteration for the change of the finishing line effective parameters is finished and the correct finished product needs no further corrections.

    In der Fig. 3 wird die Vorgehensweise bei Ermittlung der optimalen Kokillenbreite mit dem Ziel für das geplante Produktionsspektrum eines Walzprogramms möglichst gleiche Kokillenpositionen zu wählen, gezeigt.In Fig. 3, the procedure for determining the optimum mold width as far as possible with the aim of the planned production spectrum of a rolling program to select the same mold positions shown.

    Es sind zur Veranschaulichung Diagrammlinien gleicher Kokillenbreite für unterschiedliche Fertigprodukte mit und ohne Optimierung dargestellt. Die gestrichelten Linien zeigen Fertigbandbreiten bei Standard-Fahrweise, d.h. ohne Kokillenbreitenoptimierung und ohne Nutzung der Fertigstraßen-Stellglieder. Die dick ausgezogenen Linien zeigen Fertigbandbreiten mit Kokillenbreitenoptimierung und mit Einsatz der Fertigstraßen-Stellglieder. By way of illustration, there are graph lines of the same mold width for different ones Finished products with and without optimization shown. The dashed Lines show finished bandwidths in standard driving, i. without mold width optimization and without the use of the finishing line actuators. The thick undressed Lines show finished strip widths with mold width optimization and with insert the finishing line actuators.

    Wenn die Kokillenbreite BK so gewählt ist, dass für das Fertigprodukt 2 die Bandbreite BF2 im schraffierten Toleranzfenster liegt bzw. gleich der Zielbreite BZ ist, so ergeben sich häufig für das Fertigprodukt 1 bei gleicher Kokillenbreite Überbreiten BF1.If the mold width B K is chosen such that for the finished product 2, the bandwidth B F2 is in the hatched tolerance window or equal to the target width B Z , then often result for the finished product 1 with the same mold width excess width B F1 .

    Im ersten Schritt werden dann die Breitenwirkbereiche W1, W2 der Fertigstraßen-Stellglieder für beide Fertigprodukte 2 bzw. 1 ermittelt. Im zweiten Schritt wird der Mittelwert BM zwischen maximal möglicher Fertigbreite BF2 und minimal möglicher Fertigbreite BF1 bestimmt.In the first step, the width effective ranges W 1 , W 2 of the finishing line actuators for both finished products 2 and 1 are then determined. In the second step, the mean value B M between the maximum possible finished width B F2 and the minimum possible finished width B F1 is determined.

    Die Differenz ΔBopt zwischen der Breite BM und der Zielbreite BZ ergibt die optimierte Kokillenbreite BKopt = BK - ΔBopt , um für die beiden Produkte des Produktionsprogramms das schraffierte Breitentoleranzfenster ΔB zu erreichen.The difference .DELTA.B opt between the width B M and the target width B Z gives the optimized mold width B K opt = K B - .DELTA.B opt to achieve the hatched width tolerance window Δ B for the two products of the production program.

    Ausgehend von der optimierten Kokillenbreite BKopt (B'K1 = B'K2) ergeben sich mit der Nutzung der Fertigstraßenstellglieder die optimierten Breiten B'F1; B'F2, die beide im Breitentoleranzfenster ΔB liegen. Liegt die Fertigbreite B'F2 unterhalb der minimalen Breitentoleranzgrenze, demnach im unzulässigen Bereich, so muß die Kokillenbreite um diesen Betrag korrigiert werden.Starting from the optimized mold width B Kopt (B ' K1 = B' K2 ), the optimized widths B ' F1 result with the use of the finishing line actuators . B 'F2, both of which are within tolerance window width Δ B. If the finished width B ' F2 lies below the minimum width tolerance limit, ie in the impermissible range, then the mold width must be corrected by this amount.

    Zur Ermittlung der erforderlichen Kokillenposition werden dann iterativ die Modellbausteine gemäß Fig. 2, nämlich:

    • Stichplanmodell (10)
    • Konturmodell (11)
    • Breitungsmodell (12)
    • Algorithmus zur Veränderung von Fertigstraßenwirkparametern ΔW in beanspruchter Rangfolge
    entsprechend dem Flußdiagramm nach Fig. 2 verwendet. To determine the required mold position, the model building blocks according to FIG. 2 are iteratively then, namely:
    • Schedule Model (10)
    • Contour model (11)
    • Breitungs model (12)
    • Algorithm for modifying finishing road working parameters ΔW in claimed order
    used in accordance with the flowchart of FIG. 2.

    Bedeutung der Zeichen in den Figuren:Meaning of the characters in the figures:

    Figur 1FIG. 1 dF(mm) =d F (mm) = FertigbanddickeFinished strip thickness ΔBF(mm) =ΔB F (mm) = Breitenabweichungwidth deviation Tol =Tol = max. Toleranzbreite des WalzbandesMax. Tolerance width of the rolled strip BFSoll =B FSoll = SOLL-Fertigbreite des WalzbandesDESIRED ready width of the rolled strip Ww =Ww = Walzenwechselroll change Figur 2FIG. 2 BK =B K = Kokillenbreite/Vorbandbreite (Kopf/Ende)Mold width / pre-width (head / end) BF =B F = eff. Fertigbreite des Walzbandeseff. Finished width of the rolled strip BF1-n =B F1-n = Bandbreiten zwischen den GerüstenBandwidths between the scaffolds BBR =B BR = gemessene Brammenbreitemeasured slab width Δ W =ΔW = Änderung der Fertigstraßen-WirkparameterModification of the finishing line effect parameters 10 =10 = Stichplan-ModellPass schedule model 11 =11 = Kontur-ModellContour model 12 =12 = Breitungs-Modell (C = Caster;Breitungs model (C = Caster; F = Fertigstraße)F = finishing line) 13 =13 = Adaption CasterbreiteAdaptation of caster width 14 =14 = Adaption BandbreiteAdaptation bandwidth 15 =15 = Position SeitenführungenPosition side guides 16 =16 = gemessene Fertigbreite des Walzbandesmeasured finished width of the rolled strip Figur 3FIG. 3 BK1; BK2 =B K1 ; B K2 = Kokillenbreite ohne OptimierungMold width without optimization BKopt =B Kopt = Kokillenbreite mit OptimierungMold width with optimization W1; W2 =W 1 ; W 2 = Wirkglieder-Stellbereich der FertigstraßeActuator setting range of the finishing train St =St = Stellgliederactuators BF1; BF2 =B F1 ; B F2 = Fertigbandbreiten ohne OptimierungFinished bandwidths without optimization B'F1; B'F2 =B 'F1; B ' F2 = Fertigbandbreiten mit OptimierungFinished bandwidths with optimization BZ =B Z = Zielbreite target width Δ B =Δ B = Breitentoleranz des WalzbandesWidth tolerance of the rolled strip ΔBopt =Δ Bopt = Breitendifferenz der Kokille zwischen den Positionen mit und ohne OptimierungWidth difference of the mold between the positions with and without optimization BM =B M = Mittelwert zwischen max. möglicher Fertigbreite BF2 und min. möglicher Fertigbreite BF1 Mean value between max. possible finished width B F2 and min. possible finished width B F1 Index 1 =Index 1 = Fertigprodukt 1Finished product 1 Index 2 =Index 2 = Fertigprodukt 2Finished product 2

    Claims (11)

    1. Method of continuous casting and rolling to a finished state of a cast slab within a predetermined finished width tolerance of the rolled strip, wherein a setting of the mould position is undertaken, particularly in accordance with different rolling conditions, for the cast slab and from case to case a following slab, characterised in that
      for attainment of the predetermined finished width (BZ) of the rolled strip within a tolerance band (ΔB) initially a presetting of the mould position (BK) is undertaken with consideration of the extreme strip dimensions of the planned production program and
      for each cast slab and from case to case a following slab a computation for the target setting of the mould setting elements and the setting elements of the finishing train is undertaken and in the case of the width, which is present, of the cast slab at the entry into the finishing train a fine setting of the finished width of the rolled strip is undertaken with the help of the setting elements of the finishing train,
      the setting elements of the mould are driven in correspondence with the computer-ascertained target setting prior to casting of the following slab and the computation of the mould setting elements and/or the finishing train setting elements is based on a pass plan model (10), a profile model (11) and a width spread model (12) and the target setting, which is ascertained by computation, of the finishing train setting elements is moved to before rolling of the succeeding slab.
    2. Method according to claim 1, characterised in that the width presetting for the mould setting elements and the finishing train setting elements is so undertaken that approximately the centre of the tolerance band (ΔB) of the finished width of the rolled strip results for each rolled strip.
    3. Method according to claim 1 or 2, characterised in that
      before production of a new cast slab a strip profile computation and a pass plan computation as well as the width spread model are initiated, whereafter
      a corresponding presetting of the mould setting elements is undertaken,
      subsequently the effective width (BF) of the strip rolled to finished state is measured and
      the result is based on the correction of the width spread model required from case to case and thus on the computation of the finishing train setting elements.
    4. Method according to one or more of claims 1 to 3, characterised in that initially the finishing train setting elements are changed in accordance with a required correction magnitude of the presetting in the case of unchanged mould position.
    5. Method according to one or more of claims 1 to 4, characterised in that for the target setting of the setting elements for mould and finishing train for attainment of high accuracy a width spread model (12) is used as a basis for a presetting, which takes into consideration at least the following influences:
      width change between mould and exit at the casting machine
      temperature shrinkage from the casting machine up to the finished strip
      strip tension within the finishing train
      profile changes of the slab form up to the finished strip form
      planarity state of the strip between the finishing stands
      strip thickness, natural width spread of the strip
      rolling speed, rolling temperature
      material quality of the strip
      decrease in upsetting
      slab profile or prestrip profile (as measured or calculated value)
    6. Method according to one or more of claims 1 to 5, characterised in that an adaptation correction coefficient (13) is obtained through comparison of the measured width (BBR) of the cast slab with the calculated slab width and is used for correction of the width spread model (12a).
    7. Method according to one or more of claims 1 to 6, characterised in that a width error measured in the region of the casting machine is applied to the width spread model of the finishing train (12b).
    8. Method according to one or more of claims 1 to 7, characterised in that for fine setting of the finished width of the rolled strip in the finishing train the following actual parameters (ΔW) are taken into consideration in the indicated sequence and used in such a manner that the difference between the calculated width and the target width is minimised:
      change in the decrease distribution in the finishing train
      change in the target profile within the scope of the profile tolerance band
      change in the tensile stress between the stands
      use of the upsetter
      change in the active stand number or pass number.
    9. Method according to one or more of claims 1 to 8, characterised in that the minimum/maximum setting ranges of the finishing train setting elements are ascertained for enlarging the tolerance region for the setting of the mould position.
    10. Method according to one or more of claims 1 to 9, characterised in that the setting elements of the mould and/or the setting elements for the width influencing are used statically in the finishing train or variably over the strip length.
    11. Use of the method according to at least one of claims 1 to 10,
      on at least one thin slab casting machine with at least one directly downstream rolling train, particularly with multiple stands,
      on conventional finishing trains, particularly with multiple stands,
      on rolling trains with a reversing stand, particularly operating with several passes,
      on the rolling of endless strips,
      on the rolling of individual strips.
    EP99106087A 1998-03-31 1999-03-26 Process for continuous casting and finish rolling of a cast strand within a predetermined net width Expired - Lifetime EP0947265B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19814222A DE19814222A1 (en) 1998-03-31 1998-03-31 Process for continuous casting and finish rolling of a casting strand within a specified finished width tolerance
    DE19814222 1998-03-31

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    EP0947265A2 EP0947265A2 (en) 1999-10-06
    EP0947265A3 EP0947265A3 (en) 2001-01-31
    EP0947265B1 true EP0947265B1 (en) 2005-09-28

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    EP (1) EP0947265B1 (en)
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    ES (1) ES2249855T3 (en)

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    DE102015223496A1 (en) * 2015-11-26 2017-06-01 Sms Group Gmbh Method and apparatus for adjusting the width of a continuously cast metal strand

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    ES2249855T3 (en) 2006-04-01
    US6112394A (en) 2000-09-05
    EP0947265A2 (en) 1999-10-06
    ATE305347T1 (en) 2005-10-15
    DE59912593D1 (en) 2005-11-03
    EP0947265A3 (en) 2001-01-31
    JPH11319901A (en) 1999-11-24
    DE19814222A1 (en) 1999-10-07

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