EP0551311A1 - Liquid-cooled mould for continuous casting of steel billets in slab form. - Google Patents

Liquid-cooled mould for continuous casting of steel billets in slab form.

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Publication number
EP0551311A1
EP0551311A1 EP91916776A EP91916776A EP0551311A1 EP 0551311 A1 EP0551311 A1 EP 0551311A1 EP 91916776 A EP91916776 A EP 91916776A EP 91916776 A EP91916776 A EP 91916776A EP 0551311 A1 EP0551311 A1 EP 0551311A1
Authority
EP
European Patent Office
Prior art keywords
mold
height
section
side plates
strand
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.)
Granted
Application number
EP91916776A
Other languages
German (de)
French (fr)
Other versions
EP0551311B1 (en
Inventor
Giovanni Arvedi
Giovanni Gosio
Ulrich Siegers
Luciano Manini
Fritz-Peter Pleschiutschnigg
Lothar Parschat
Hans-Guenther Thurm
Harald Luedorff
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
Publication date
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0551311A1 publication Critical patent/EP0551311A1/en
Application granted granted Critical
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Classifications

    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/043—Curved moulds

Definitions

  • the invention relates to a liquid-cooled, width-adjustable plate mold for the continuous casting of steel strands in
  • the mold exit corresponds to the desired strand format.
  • a corresponding mold for a strand with an oval cross section is known from US Pat. No. 2,767,448.
  • This mold relates to a so-called block mold, ie the cross-section of the mold cannot be changed or is not suitable for setting different strand formats.
  • DE 3501 422 C2 a mold belongs to the prior art, the narrow side walls of which can be adjusted to different strand dimensions and the pouring opening has an oval cross-sectional area.
  • the mold tapers in such a way that the slab broad sides are formed with parallel walls, while the narrow side walls diverge from the pouring side to the pouring side. but keep their concave shape.
  • Such a mold is also known from EP 0249 146 or US Pat. No. 4,716,955.
  • molds are known, with flat surfaces of the narrow sides of the mold and broad sides that bulge outwards over the entire height of the mold.
  • Mold wall Deformation of the strand shell occurs when the strand passes through the mold, which can lead to cracking in the strand shell.
  • the present invention is based on the object
  • Part of the invention is that the reduction in the apex height can be done both linearly and after an e-function.
  • the crowning provided according to the invention can also differ from the circular shape in a polygon or from the combination of Polygonal trains and floor elements. Overall, it is provided that at the bottom of the mold, that is to say at the end of the strand exit, there is still the optimum crowning, for example, 1 mm per side for a rolling process. Accordingly, the following roller strand guide is designed in accordance with the crowning of the strand. This results in the advantage, among other things, that all rolls of the same diameter can be freely converted in their position and no deformation work with regard to changing the crowning has to be carried out.
  • Fig. 1 is a plan view of a mold in cross section A-A
  • FIG. 2 shows a partial image according to FIG. 1 with the position of the narrow sides for a maximum slab width
  • Fig. 3 is a longitudinal section B-B of Fig. 1 and
  • Fig. 4 shows the adjustment range of the mold according to Figs. 1 and
  • Fig. 5 shows another embodiment in longitudinal section
  • the mold consists of broad side plates 1 with narrow side plates 2 arranged between them.
  • the narrow side plates 2 defnue the smallest casting cross-section achievable with this mold, ie the smallest slab width (b min).
  • this area 3 a flat, arc-shaped recess, seen in cross section extending over this area 3, is worked into the broad side plate 1 on the sides forming the casting cross section.
  • the arch height or apex height 13 compared to an inscribed rectangle - chord of the arch - on the pouring side 4 of the mold is a maximum of 12 mm above one Section 6 of about 1/3 of the mold height and then decreases to the lower edge 5 of the mold hm to an arc height of 1 mm (Fig. 5).
  • the selected crowning on the casting side of the mold corresponds to a max. Strand tray extension over the format width of 20% of shrinkage.
  • areas 3 ′ adjoin the area 3 of the broad side plate 1 1, within which the narrow side plates 2 can be adjusted (FIG. 2). These areas 3 ′ extend over the entire mold height with a constant cross-sectional area for the strand to be produced.
  • the broad side plates 1 are machined in the area 3 'in such a way that the surface enclosed by the broad sides in plan view, starting from the side lines of the inscribed rectangle, form an isosceles trapezoid in such a way that the larger base line of the trapezoid coincides with the side lines of the inscribed rectangle .
  • the base line of the trapezoid is 0.4 mm longer than the opposite side.
  • the contact pressure of the broad side plates on the narrow side plates is first reduced when the width is adjusted, the narrow side plates are then moved and then the broad side plates are then pressed again.
  • the described configuration of the broad side plate 1 is applicable to straight and circular chill molds and also to curved chill molds with several different radii of curvature, as shown in FIG. 3 and designated R1-R4.
  • a mold is shown, the pouring side of a straight section 6 with a subsequent arcuate part consists.
  • the immersion spout 7 which is elongate in cross section, for supplying the melt.
  • the broad side plates 1 are cooled by means of water which is passed through channels 8 in the rear of the shaping wall consisting of copper.
  • the copper walls are fastened in the usual way to a plate, not shown, which at the same time covers the channels, via bolts which engage in recesses 9.
  • the cooling channels 8 have a depth, at least in the upper mold half, such that the distance of the channel base 8 ', seen in plan view, increases from the mold center 10 to the narrow side walls 2 in relation to the surface of the broad side plate 1 facing the melt.
  • the mold consists of three areas with different crown heights 13 of the arc.
  • the area 6, here also designated L1 corresponds to that as described in FIG. 5.
  • the apex height 13 decreases linearly to an amount 14 which corresponds to that at the mold exit 5.
  • the lower mold section 12 thus has a constant apex height 13. While a certain crowning is also present on the lower edge 5 of the mold in the embodiments described so far, the shape of the broadside plate 1 on the lower edge - i.e. at the end of the strand exit - of the mold corresponds to the strand format to be produced in the embodiment according to Figures 6-8.
  • the transition from the cambered pouring side 4 to the lower edge 5 clearly results from the steps shown in FIGS. 6-8.
  • the shrinking process of the strand is possibly hindered or blocked by parallel broad-side copper plates, but rather facilitated by the crowning,

Abstract

La présente invention concerne une lingotière à plaques refroidie par liquide et réglable en largeur, destinée à la coulée en continu de billettes d'acier sous forme de brames, en particulier d'une épaisseur inférieure à 100 mm. Les plaques de face (1) et les plaques de rive (2) de la lingotière définissant la forme de la billette donnent à cette dernière dans le sens transversal une section épaissie, et les plaques de rive sont sensiblement parallèles sur toute la hauteur de la lingotière. Les plaques de face (1) sont concaves sur une zone (3) correspondant à la plus petite largeur de la brame de manière qu'en coupe transversale le point culminant de la paroi de la lingotière formant un arc présente une hauteur spécifique par rapport à un rectangle inscrit. La forme des plaques au niveau de la zone d'évacuation (5) des billettes correspond au format de billette voulu.The present invention relates to a liquid-cooled and width-adjustable plate ingot mold intended for the continuous casting of steel billets in the form of slabs, in particular with a thickness of less than 100 mm. The face plates (1) and the edge plates (2) of the mold defining the shape of the billet give the latter in the transverse direction a thickened section, and the edge plates are substantially parallel over the entire height of the ingot mold. The face plates (1) are concave over an area (3) corresponding to the smallest width of the slab so that in cross section the highest point of the wall of the mold forming an arc has a specific height with respect to an inscribed rectangle. The shape of the plates at the discharge area (5) of the billets corresponds to the desired billet format.

Description

Flüssigkeitsgekühlte Kokille für das Stranggießen von Strängen aus Stahl im Brammenformat  Liquid-cooled mold for the continuous casting of steel strands in slab format
Die Erfindung betrifft eine flüssigkeitsgekühlte, breitenverstellbare Plattenkokille für das Stranggießen von Strängen aus Stahl im The invention relates to a liquid-cooled, width-adjustable plate mold for the continuous casting of steel strands in
Brammenformat, insbesondere mit einer Dicke der Brammen unter 100 mm. Slab format, in particular with a slab thickness of less than 100 mm.
Zur Erzeugung von Stahlsträngen im Brammenformat bedient man slon üblicherweise Kokillen, deren freie Querschnittsflache am For the production of steel strands in slab format, slon is usually used, the free cross-sectional area of which
Kokillenausgang dem gewünschten Strangformat entspricht. The mold exit corresponds to the desired strand format.
Aus der US-PS 2767448 ist eine entsprechende Kokille für einen Strang mit ovalem Querschnitt bekannt. Diese Kokille betrifft eine sogeoannte Blockkokille, d. h. die Kokille ist im Querschnitt nicht veränderbar bzw. für die Einstellung verschiedener Strangformate nicht geeignet. Ferner gehört durch die DE 3501 422 C2 eine Kokille zum Stand der Technik, deren Schmalseitenwände auf unterschiedliche Strangabmessungen einstellbar ist und deren Eingießöffnung eine ovale Querschnittsfläche aufweist. Zum Austrittsende hin verjüngt sich die Kokille derart, daß, die Brammenbreitseiten parallelwandig ausgebildet sind, während die Schmalseitenwände von der Eingießseite zur Ausgießseite divergieren, ihre konkave Form jedoch beibehalten. Eine derartige Kokille ist ebenso aus der EP 0249 146, bzw. der US-PS 47 16 955 bekannt. A corresponding mold for a strand with an oval cross section is known from US Pat. No. 2,767,448. This mold relates to a so-called block mold, ie the cross-section of the mold cannot be changed or is not suitable for setting different strand formats. Furthermore, from DE 3501 422 C2, a mold belongs to the prior art, the narrow side walls of which can be adjusted to different strand dimensions and the pouring opening has an oval cross-sectional area. Towards the exit end, the mold tapers in such a way that the slab broad sides are formed with parallel walls, while the narrow side walls diverge from the pouring side to the pouring side. but keep their concave shape. Such a mold is also known from EP 0249 146 or US Pat. No. 4,716,955.
Gemäß DE-AI 36 27991 und WO 87/00099 sind Kokillen bekannt, mit ebenen Flächen der Kokillenschmalseiten und über die ganze Höhe der Kokille nach außen gewölbten Breitseiten. According to DE-AI 36 27991 and WO 87/00099, molds are known, with flat surfaces of the narrow sides of the mold and broad sides that bulge outwards over the entire height of the mold.
Bei Anwendung all dieser Kokillen ist zu verzeichnen, daß offenbar bedingt durch unterschiedliches Anliegen der Strangschale an der When using all of these molds it can be noted that apparently due to different concerns of the strand shell on the
Kokillenwand Verformungen der Strangschale beim Durchgang des Stranges durch die Kokille auftreten, die zu Rißbildungen in der Strangschale führen können. Mold wall Deformation of the strand shell occurs when the strand passes through the mold, which can lead to cracking in the strand shell.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die The present invention is based on the object
Abkühlungsverhältnisse innerhalb der Stranggießkokille zu verbessern und beim Durchgang des Stranges durch die Kokille ein Blockieren der To improve cooling conditions within the continuous casting mold and blocking the passage of the strand through the mold
Bewegung des Stranges auch in Breitenrichtung zu vermeiden, so daß die Gefahr von Längsrissen und Durchbrüchen weitestgehend ausgeschlossen ist. Avoid movement of the strand in the width direction, so that the risk of longitudinal cracks and breakthroughs is largely excluded.
Bei einer Kokille gemäß Gattungsbegriff des Anspruches 1 wird die Aufgabe erfindungsgemäß durch die Merkmale des kennzeichnenden Teiles des Anspruches 1 gelöst. In a mold according to the preamble of claim 1, the object is achieved according to the invention by the features of the characterizing part of claim 1.
Weitere Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben. Further refinements of the invention are specified in the subclaims.
Mit zur Erfindung gehört, daß die Verringerung der Scheitelhöhe sowohl linear als auch nach einer e-Funktion erfolgen kann. Die gemäß der Erfindung vorgesehene Bombierung kann auch abweichend von der Kreisform in einem Polygon bestehen oder aus der Kombination von Polygonalzügen und Bodenelementen. Insgesamt ist vorgesehen, daß am Fuß der Kokille, also am Strangaustrittsende, noch die für einen Walzprozeß optimale Bombierung von z.B. 1 mm pro Seite vorliegt. Demgemäß ist die folgende Rollen-Strangführung entsprechend der Bombierung des Stranges ausgebildet. Dies ergibt u.a. den Vorteil, daß alle Rollen gleichen Durchmessers in ihrer Position beliebig konvertierbar sind und keine Verformungsarbeit hinsichtlich der Veränderung der Bombierung zu leisten ist. Part of the invention is that the reduction in the apex height can be done both linearly and after an e-function. The crowning provided according to the invention can also differ from the circular shape in a polygon or from the combination of Polygonal trains and floor elements. Overall, it is provided that at the bottom of the mold, that is to say at the end of the strand exit, there is still the optimum crowning, for example, 1 mm per side for a rolling process. Accordingly, the following roller strand guide is designed in accordance with the crowning of the strand. This results in the advantage, among other things, that all rolls of the same diameter can be freely converted in their position and no deformation work with regard to changing the crowning has to be carried out.
Die Zeichnung stellt ein Ausführungsbeispiel einer erfindungsgemäßen Kokille dar. Es zeigen The drawing shows an embodiment of a mold according to the invention
Fig. 1 eine Draufsicht auf eine Kokille im Querschnitt A-A Fig. 1 is a plan view of a mold in cross section A-A
nach Fig. 3 für eine minimale Brammenbreite  3 for a minimum slab width
Fig. 2 ein Teilbild nach Fig. 1 mit der Stellung dei Schmalseiten für eine maximale Brammenbreite,  2 shows a partial image according to FIG. 1 with the position of the narrow sides for a maximum slab width,
Fig. 3 einen Längsschnitt B-B nach Fig. 1 und  Fig. 3 is a longitudinal section B-B of Fig. 1 and
Fig. 4 den Verstellberench der Kokille nach den Fig. 1 und  Fig. 4 shows the adjustment range of the mold according to Figs. 1 and
2 in vergrößerter Darstellung.  2 in an enlarged view.
Fig. 5 eine weitere Ausführungsform im Längsschnitt  Fig. 5 shows another embodiment in longitudinal section
Fig.6-8 eine abgewandelte Ausführung in Schnitten  Fig.6-8 a modified version in sections
In den Zeichnungen sind gleiche Teile mit gleichen Bezugszeichen versehen. Die Kokille besteht aus Breitseitenplatteii 1 mit zwischen diesen verschiebbai angeordneten Schmalseitenplatten 2. In der in Fig. 1 dargestellten Lage defnueien die Schmalseitenplatten 2 den mit dieser Kokille erzielbaren kleinsten Gießquerschiu tt , also die geringste Brammenbrei te ( b min). In diesem Bereich 3 ist in die Breitseitenplatteii 1 auf den den Gießquerschnitt bildenden Seiten eine flache, bogenförmige, im Querschnitt gesehen sich üder diesen Bereich 3 erstreckende Ausnehmung eingearbeitet. Die Bogenhöhe bzw. Scheitelhöhe 13 gegenüber einem eingeschriebenen Rechteck - Sehne des Bogens - beträgt an der Eingießseite 4 der Kokille maximal 12 mm über einen Abschnitt 6 von ca. 1/3 der Kokillenhöhe und verringert sich dann zur Unterkante 5 der Kokille hm auf eine Bogenhöhe von 1 mm (Fig. 5). Die gewählte Bombierung an der Eingießseite der Kokille entspricht einer max. Strangschalenverlängeruiig über die Format-Breite von 20 % des Schrumpfens. In the drawings, the same parts are provided with the same reference numerals. The mold consists of broad side plates 1 with narrow side plates 2 arranged between them. In the position shown in FIG. 1, the narrow side plates 2 defnue the smallest casting cross-section achievable with this mold, ie the smallest slab width (b min). In this area 3, a flat, arc-shaped recess, seen in cross section extending over this area 3, is worked into the broad side plate 1 on the sides forming the casting cross section. The arch height or apex height 13 compared to an inscribed rectangle - chord of the arch - on the pouring side 4 of the mold is a maximum of 12 mm above one Section 6 of about 1/3 of the mold height and then decreases to the lower edge 5 of the mold hm to an arc height of 1 mm (Fig. 5). The selected crowning on the casting side of the mold corresponds to a max. Strand tray extension over the format width of 20% of shrinkage.
Beispiel: Example:
Strangbreite 1.000 mm  String width 1,000 mm
Schrumpf (0,8 %) 8 mm  Shrinkage (0.8%) 8 mm
zusätzliche Längung max. 1,6 mm  additional elongation max. 1.6 mm
Zur Vergrößerung derr Brammenbreite schließen sich an den Bereich 3 der Breitseitenplatteii 1 seitlich Bereiche 3' an, innerhalb der die Schmalseitenplatten 2 verstellt werden können (Fig. 2). Diese Bereiche 3' erstrecken sich bei gleichbleibender Querschnittsfläche für den zu erzeugenden Strang über die gesamte Kokillenhöhe. Die Breitseitenplatten 1 sind in dem Bereich 3' derart bearbeitet, daß die von den Breitseiten eingeschlossene Fläche in der Draufsicht, ausgehend von den Seitenlinien des eingeschriebenen Rechteckes, ein gleichschenkliges Trapez bilden derart, daß die größere Grundlinie des Trapezes mit den Seitenlinien des eingeschriebenen Rechteckes übereinstimmt. Dabei ist die Grundlinie des Trapezes 0,4 mm länger als die gegenüberliegende Seite. In Hinblick auf diese Neigung des Bereiches 3' wird bei einer Breitenverstellung zunächst der Anpreßdruck der Breitseitenplatten an die Schmalseitenplatten verringert, die Schmalseitenplatten werden dann verschoben und anschließend werden dann die Breitseitenplatteii wieder angepreßt. Die beschriebene Ausbildung der Breitseitenplatteii 1 ist anwendbar bei graden und kreisbogenförmigen Kokillen und auch bei gebogenen Kokillen mit mehreren, unterschiedlichen Krümmungsradien, wie in Fig. 3 dargestellt und mit R1 - R4 bezeichnet. To increase the width of the slab, areas 3 ′ adjoin the area 3 of the broad side plate 1 1, within which the narrow side plates 2 can be adjusted (FIG. 2). These areas 3 ′ extend over the entire mold height with a constant cross-sectional area for the strand to be produced. The broad side plates 1 are machined in the area 3 'in such a way that the surface enclosed by the broad sides in plan view, starting from the side lines of the inscribed rectangle, form an isosceles trapezoid in such a way that the larger base line of the trapezoid coincides with the side lines of the inscribed rectangle . The base line of the trapezoid is 0.4 mm longer than the opposite side. In view of this inclination of the area 3 ', the contact pressure of the broad side plates on the narrow side plates is first reduced when the width is adjusted, the narrow side plates are then moved and then the broad side plates are then pressed again. The described configuration of the broad side plate 1 is applicable to straight and circular chill molds and also to curved chill molds with several different radii of curvature, as shown in FIG. 3 and designated R1-R4.
In der Fig. 5 ist eine Kokille dargestellt, die eingießseitig aus einem geraden Abschnitt 6 mit anschließendem bogenförmggen Teil besteht. In den geraden Abschnitt 6 der Kokille ragt der im Querschnitt längliche Tauchausguß 7 für die Schmelzenzufuhr hinein. Die Breitseitenplatten 1 werden mittels Wasser, das durch Kanäle 8 in der Rückseite der aus Kupfer bestehenden formgebenden Wand geleitet wird, gekühlt. Die Kupferwände sind in üblicher Weise an einer nicht dargestellten Platte, die gleichzeitig die Kanäle abdeckt, über Bolzen, die in Ausnehmungen 9 eingreifen, befestigt. In Fig. 5 a mold is shown, the pouring side of a straight section 6 with a subsequent arcuate part consists. In the straight section 6 of the mold protrudes the immersion spout 7, which is elongate in cross section, for supplying the melt. The broad side plates 1 are cooled by means of water which is passed through channels 8 in the rear of the shaping wall consisting of copper. The copper walls are fastened in the usual way to a plate, not shown, which at the same time covers the channels, via bolts which engage in recesses 9.
Die Kühlkanäle 8 haben mindestens in der oberen Kokillenhälfte eine Tiefe derart, daß sich der Abstand der Kanalsohle 8', in der Draufsicht gesehen, von der Kokillenmitte 10 zu den Schmalseitenwänden 2 in gegenüber der der Schmelze zugekehrten Oberfläche der Breitseitenplatte 1 vergrößert. The cooling channels 8 have a depth, at least in the upper mold half, such that the distance of the channel base 8 ', seen in plan view, increases from the mold center 10 to the narrow side walls 2 in relation to the surface of the broad side plate 1 facing the melt.
In Fig. 5 schließt sich an den Bereich 6 konstanter Scheitelhöhe 13, der etwa 1/3 der Kokiiienhöhe umfaßt und m jedem Fall den Gießspiegelbereich überdeckt, ein Bereich an, in dem die Scheitelhöhe des Bogens sich linear zum Kokillenausgang 5 hm verringert. In FIG. 5, the area 6 of constant apex height 13, which comprises approximately 1/3 of the mold height and in each case covers the area of the mold level, is followed by an area in which the apex height of the arc decreases linearly to the mold exit 5 hm.
Fig. 3 zeigt eine andere Ausführungsform. Hirr besteht die Kokille aus drei Bereichen mit unterschiedlichen Scheitelhöhen 13 des Bogens. Der Bereich 6, hier auch mit L1 bezeichnet, entspricht dem, wie in Fig. 5 beschrieben. Im anschließenden Abschnitt L2, der bei L1 ungefähr in der Mitte der Kokillenhöhe endet, geht die Scheitelhöhe 13 linear auf einen Betrag 14 zurück, der dem am Kokillenausgang 5 entspricht. Der untere Kokillenabschnitt 12 weist damit eine konstante Scheitelhöhe 13 auf. Während bei den bisher beschriebenen Ausführungen eine gewisse Bombierung auch noch an der Unterkante 5 der Kokille vorhanden ist, entspricht bei der Aushführung nach den Figuien 6 - 8 die Form der Breitseitenplatteii 1 an der Unterkante - also am Strangaustrittsende - der Kokille dem zu erzeugenden Strangformat. Der Übergang von der bombierten Eingießseite 4 zur Unterkante 5 ergibt sich aus den in den Figuren 6 - 8 dargestellten Schritten eindeutig. 3 shows another embodiment. Hirr, the mold consists of three areas with different crown heights 13 of the arc. The area 6, here also designated L1, corresponds to that as described in FIG. 5. In the subsequent section L2, which ends at L1 approximately in the middle of the mold height, the apex height 13 decreases linearly to an amount 14 which corresponds to that at the mold exit 5. The lower mold section 12 thus has a constant apex height 13. While a certain crowning is also present on the lower edge 5 of the mold in the embodiments described so far, the shape of the broadside plate 1 on the lower edge - i.e. at the end of the strand exit - of the mold corresponds to the strand format to be produced in the embodiment according to Figures 6-8. The transition from the cambered pouring side 4 to the lower edge 5 clearly results from the steps shown in FIGS. 6-8.
Das mit der erfindungsgemäßen Kokille realisierte Verfahren zur Erzeugung einer leicht bombierten Bramme bzw. Dünnbramme führt zu folgenden Vorteilen: The method for producing a slightly cambered slab or thin slab implemented with the mold according to the invention leads to the following advantages:
- gleichförmiger Materialfluß des Walzgutes über die Bandbreite im Walzspalt und damit - Uniform material flow of the rolling stock over the bandwidth in the roll gap and thus
- nohe Profilkonstanz des Fertigbandes, - no profile constancy of the finished strip,
- zentrischer Lauf der Bramme oder des Walzgutes in der Kokille sowie von Rollen- bzw. Walzenpaar zu Walzenpaar. - Centric run of the slab or the rolling stock in the mold as well as from roller or roller pair to roller pair.
Der zentrische Lauf der Bramme in der Kokille führt zu folgenden gießtechnischen Vorteilen: The central running of the slab in the mold leads to the following casting advantages:
- gleichförmiger, spezifischer Wärmetransport m die Schmal- und Breiseiten-Kupferplatten, sowohl in horizontaler als auch in vertikaler Richtung, gleichförmige Spaltausbildung zwischen Strangschaie und Cu-Platte im Gießspiegeibereich, - uniform, specific heat transport m the narrow and broadside copper plates, both in the horizontal and in the vertical direction, uniform gap formation between strand mold and copper plate in the area of the casting mirror,
- gleichförmige Schmierfilmausbildung der Gießschlacke, - uniform lubricating film formation of the casting slag,
- der Schrumpfvorgang des Stranges, besonders m Breitenrichtung, wird durch durch paralle Breitseiten-Kupferplatten eventuell behindert bzw. blockiert, sondern vielmehr durch die Bombierung erleichtert, the shrinking process of the strand, especially in the width direction, is possibly hindered or blocked by parallel broad-side copper plates, but rather facilitated by the crowning,
- Anhebung des Temperaturprofiles über die Brammenbreite im Bereich neben den Schmalseitenkanten. - Raising the temperature profile across the slab width in the area next to the narrow side edges.

Claims

Patentansprüche Claims
1. Flüssigkeitsgekühlte, Dreitenverstellbare Plattenkokilte für das Stranggießen von Strängen aus Stahl im Brammenformat, insbesondere für eine Dicke der Bramme unter 100 mm, 1. Liquid-cooled, three-way adjustable plate coils for the continuous casting of steel strands in slab format, in particular for a slab thickness of less than 100 mm,
flaflurch gekennzeichnet,  marked flat,
daß die formgebenden Breitseitenplatten (1) und Schmalseitenplatten (2) der Kokille in Richtung inrer Quererstreckung im Sinne einer Querschnittsvergrößerung für den Strang ausgebildet sind,  that the shaping broad side plates (1) and narrow side plates (2) of the mold are designed in the direction of their transverse extent in the sense of an increase in cross section for the strand,
die Schmalseitenplatten (2) über die Kokiiienhδne im wesentlichen paraiLei zueinander angeordnet sind,  the narrow side plates (2) are arranged essentially parallel to one another via the coconut groves,
die Breitseitenplatten (1) mindestens in einem Bereich (3) geringster Brammenbreite konkav ausgebildet sind, derart, daß im Querschnitt die Scheitelhöhe (13) der einen Bogen bildenden  the broad side plates (1) are concave in at least one region (3) of the smallest slab width in such a way that in cross section the apex height (13) of those forming an arc
Kokiltenwand gegenüber einem eingeschriebenen Rechteck auf der Eingieβseite (4) der Kokille maximal 12 mm pro 1000 mm  Mold wall opposite a inscribed rectangle on the pouring side (4) of the mold maximum 12 mm per 1000 mm
Brammenoreite (Sehnenlänge) beträgt und die Form der  Slab length (chord length) and the shape of the
Breitseitenplatten (1) am Strangaustrittsende (5) der Kokille dem ιu erzeugenden Strangformat entspricht, die Breitseitenplatten (1) im Verstellbereich (3') der Schmalseitenplatten (2) als ebene Fläche ausgebildet sind und in der der formgebenden Seite  Broad-side plates (1) at the end of the strand exit (5) of the mold correspond to the strand format that produces the broad-side plates (1) in the adjustment area (3 ') of the narrow-side plates (2) as a flat surface and in the form-giving side
abgewandten Seite schlitzartige Kanäle (8) angeordnet sind.  opposite slot-like channels (8) are arranged.
2. Kokille nach Anspruch 1, 2. mold according to claim 1,
dadurch gekennzeichnet,  characterized,
daß sicn die Scheitelhöhe (13) von der Eingieβseite (4) der Kokil le bis zum Strangaustrittsende (S) der Kokille kontinuierlich verringert. that sicn the crown height (13) from the pouring side (4) of the mold to the strand exit end (S) of the mold is continuously reduced.
3. Kokille nach Anspruch 1 oder 2, 3. mold according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
daß die 5cheitelhöhe (13) auf der Eingießseite (4) zwischen 5 bis 12 mm beträgt.  that the 5 apex height (13) on the pouring side (4) is between 5 to 12 mm.
4. Kokille nach einem der Ansprüche 1 bis 3, 4. mold according to one of claims 1 to 3,
dadurch gekennzeichnet,  characterized,
daß die Breitseitenplatten (1) am Strangaustrittseπde (5) der Kokille derart konkav ausgebildet sind, daß im Querschnitt gesehen die Scheitelhöhe (13) der den Bogen bildenden Kokillenwand noch mindestens 0,5 bis 2 mm beträgt.  that the broad side plates (1) are so concave at the strand exit end (5) of the mold that, seen in cross section, the crown height (13) of the mold wall forming the arc is still at least 0.5 to 2 mm.
5. Kokille nach einem der Ansprüche 1 bis 4, 5. mold according to one of claims 1 to 4,
dadurch gekennzeichnet,  characterized,
daß die Scheitelhöhe (13) über einen Bereich (6) von einem Drittel der Kokillenhόhe konstant ist.  that the crown height (13) is constant over a region (6) of one third of the mold height.
6. Kokille nach den Ansprüchen 1 bis 3 und 4, 6. mold according to claims 1 to 3 and 4,
dadurch gekennzeichnet,  characterized,
daß sich an den Bereich (6) konstanter Scheitelhöhe (13) ein weiterer Abschnitt (L2) anschließt, der etwa in halber Kokillenhöhe (bei 11) endet und In diesem Abschnitt (L2) sich die Scheitelhöhe (13) linear verringert.  that the region (6) of constant apex height (13) is followed by a further section (L2) which ends approximately at half the mold height (at 11) and in this section (L2) the apex height (13) decreases linearly.
7. Kokille nach einem der Ansprücne 1 bis 5, 7. mold according to one of claims 1 to 5,
dadurch gekennzeichnet,  characterized,
daß sich an den Bereich (6) konstanter Scheitelhöhe (13) ein weiterer Abschnitt (L2) anschließt, der etwa in halber Kokillenhöhe (bei 11) endet und in diesem Abschnitt (L2) sich die Scheitelhöhe (13) linear auf einen Betrag (14) verringert} der der Scheitelhöhe am Kokillenausgang (5) entspricht, so daß die untere Kokillenhälfte (12) eine bogenförmige Ausnehmung konstanter Scheitelhöhe that the region (6) of constant apex height (13) is followed by a further section (L2) which ends approximately at half the mold height (at 11) and in this section (L2) the apex height (13) linearly increases to an amount (14 ) reduced} which corresponds to the apex height at the mold exit (5), so that the lower mold half (12) an arcuate recess of constant apex height
aufweist.  having.
8. Kokille nach den Ansprüchen 1 bis 7 8. mold according to claims 1 to 7
dadurch gekennzeichnet,  characterized,
daß die Bogenlänge einer Seitenwand in Breitenrichtung im Bereich (3) der minimalen Brammenbreite im Vergleich zur Sehnenlänge nicht mehr als 20 % des Schrumpfens von ca. 1 % beträgt.  that the arc length of a side wall in the width direction in the region (3) of the minimum slab width in comparison to the chord length is not more than 20% of the shrinkage of approximately 1%.
9. Kokille nach den Ansprüchen 1 bis 8, 9. mold according to claims 1 to 8,
dadurch gekennzeichnet,  characterized,
daß der Abstand der Kanalsohle (8') der Kanäle (8) der  that the distance of the channel base (8 ') of the channels (8) of the
Kokillenbreitseiten (1) in der Draufsicht gesehen von der  Chill broadsides (1) seen from the top view
Kokillenmitte (Schnittebene B-B) zu den Außenoereichen (3') hin gegenüber der dem Strang zugekehrten Oberfläche der  Mold center (section plane B-B) towards the outer areas (3 ') opposite the surface of the strand facing the strand
Breitseitenplatte (2) zunimmt.  Broad side plate (2) increases.
10. Kokille nach Anspruch 9, 10. mold according to claim 9,
dadurch gekennzeichnet,  characterized,
daß die Kanalsohle (8') der Kanäle (8) der Kokilienwände mindestens in der oberen Kokillenhälfte in einer Ebene parallel zur  that the channel bottom (8 ') of the channels (8) of the mold walls at least in the upper mold half in a plane parallel to
Mittenebene (10) liegen.  Center plane (10).
11. Kokille nach einem der Ansprüche 1 bis 10, 11. mold according to one of claims 1 to 10,
dadurch gekennzeichnet,  characterized,
daß die im Verstellbereich (3') der Schmalseitenplatten (2) als ebene Fläche ausgebildeten Breitseitenplatten (1) von dem Abschnitt (3) geringster Brammenbreite ausgehend zur Langsmittelebene (10) hin geneigt sind und von der Eingießseite (4) bis zur unterkante (5) der Kokille einen jeweils gleichbleibenden, gegenseitigen Abstand aufweisen.  that the wide side plates (1), which are designed as a flat surface in the adjustment region (3 ') of the narrow side plates (2), are inclined from the section (3) of the smallest slab width starting from the longitudinal center plane (10) and from the pouring side (4) to the lower edge (5 ) the mold has a constant, mutual distance.
EP91916776A 1990-10-02 1991-09-23 Liquid-cooled mould for continuous casting of steel billets in slab form Revoked EP0551311B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4031691 1990-10-02
DE4031691 1990-10-02
DE4131829A DE4131829C2 (en) 1990-10-02 1991-09-20 Liquid-cooled mold for the continuous casting of steel strands in slab format
DE4131829 1991-09-20
PCT/DE1991/000761 WO1992005898A1 (en) 1990-10-02 1991-09-23 Liquid-cooled mould for continuous casting of steel billets in slab form

Publications (2)

Publication Number Publication Date
EP0551311A1 true EP0551311A1 (en) 1993-07-21
EP0551311B1 EP0551311B1 (en) 1994-11-02

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Application Number Title Priority Date Filing Date
EP91916776A Revoked EP0551311B1 (en) 1990-10-02 1991-09-23 Liquid-cooled mould for continuous casting of steel billets in slab form

Country Status (9)

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US (1) US5467809A (en)
EP (1) EP0551311B1 (en)
JP (1) JP2683725B2 (en)
KR (1) KR100206298B1 (en)
AT (1) ATE113509T1 (en)
CA (1) CA2093327C (en)
DE (2) DE4131829C2 (en)
ES (1) ES2063526T3 (en)
WO (1) WO1992005898A1 (en)

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Also Published As

Publication number Publication date
CA2093327A1 (en) 1992-04-03
DE59103447D1 (en) 1994-12-08
EP0551311B1 (en) 1994-11-02
ES2063526T3 (en) 1995-01-01
WO1992005898A1 (en) 1992-04-16
KR100206298B1 (en) 1999-07-01
KR920702263A (en) 1992-09-03
CA2093327C (en) 2002-06-25
DE4131829C2 (en) 1993-10-21
JPH06503757A (en) 1994-04-28
JP2683725B2 (en) 1997-12-03
US5467809A (en) 1995-11-21
DE4131829A1 (en) 1992-04-16
ATE113509T1 (en) 1994-11-15

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