EP0996514B1 - Method and device for producing thin slabs - Google Patents

Method and device for producing thin slabs Download PDF

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Publication number
EP0996514B1
EP0996514B1 EP98936178A EP98936178A EP0996514B1 EP 0996514 B1 EP0996514 B1 EP 0996514B1 EP 98936178 A EP98936178 A EP 98936178A EP 98936178 A EP98936178 A EP 98936178A EP 0996514 B1 EP0996514 B1 EP 0996514B1
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EP
European Patent Office
Prior art keywords
plane
parts
slab
mould
broad
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP98936178A
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German (de)
French (fr)
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EP0996514A1 (en
Inventor
Werner Rahmfeld
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SMS Siemag AG
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SMS Demag AG
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Publication of EP0996514A1 publication Critical patent/EP0996514A1/en
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • 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
    • B22D11/12—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
    • 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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

  • the invention relates to a continuous caster according to the preamble of patent claim 1 and a method for producing thin slabs according to the preamble of patent claim 8.
  • a liquid-cooled, width-adjustable plate mold for the continuous casting of steel strands in slab format is known, in particular for a thickness of the slabs below 100 mm, in which the shape of the broad side plates at the strand exit end of the mold corresponds to the strand format to be produced, the Broad side plates are designed as a flat surface in the adjustment area of the narrow side plates.
  • a device for the continuous casting of flat slabs in particular a steel slab with a thickness of less than 80 mm, is known, in which a smaller, similarly arched cross section on the strand exit side of the mold faces the larger, curved cross section on the pouring side and at least one Roll of at least one pair of rolls which has a supporting and guiding means arranged downstream of the mold and a caliber which is adapted to the emerging bulging strand.
  • the mold shape known from this document as well as the shape of the support and guide means arranged downstream of the mold are designed such that the mold has a shape adapted to the strand format in the edge region, that is to say Parallel side wall areas are already present in the mold and continue with the support and guide rollers of the strand guide frame.
  • a continuous caster for guiding strands is known, the broad side plates of which are concave and the concavity is constant from the upper edge of the mold to the exit of the mold and beyond to the last roll of the strand guide.
  • the concave shape advantageously extends from the beginning of one narrow side plate to the beginning of the other, opposite narrow side plate.
  • the concave shape of the broad side plates known from this document relates to a relatively complicated shape which is essentially influenced by the deflection of the roller and the current wear.
  • the strand shell in the central mold width area and thus in the funnel area is subject to a continuous bending deformation due to the withdrawal movement until it emerges from the funnel area.
  • the invention aims to provide a continuous casting device with a mold and strand guide rollers with simple structural means, which reduce the load on the strand shell and minimize the risk of longitudinal cracks and breakthroughs.
  • the mold broad sides are largely composed of flat surface parts and the strand guide rollers have a contour that is composed essentially of straight lines.
  • a flat surface is provided in the central area, which is maintained in the strand guide direction and is completely taken over by the central parts of the guide rollers beyond the mouth of the mold.
  • Flat surfaces in the direction of the narrow sides are also provided on both sides of this flat central part. The shape and inclination of these flat surfaces are exactly maintained from the entrance of the mold to the end of the strand guide frame.
  • Transition pieces are provided between the flat central surface of the mold and the flat side surfaces arranged on both sides. The extension of these transition pieces ends within the mold, so that the lower area corresponds to the strand format. In addition, this shape allows the cold strand to be introduced and removed easily when the continuous casting machine is cast on.
  • the middle part is designed to be flat in the pouring area.
  • the flat central parts of both broad slab sides taper towards each other in the strand direction until they are guided within the mold parallel to the mold mouth, forming a so-called crown.
  • the central parts in the pouring area are flat and parallel and outside the shadow area of the Dipping spout in the strand guide direction is connected by a connecting part to the central part having the "crown" in the mouth region of the mold.
  • the central parts have a shape, the contour lines of which are parallel to one another and the longitudinal extension of which is S-shaped in the strand conveying direction. The mouth of this S-shape merges tangentially into the neighboring areas.
  • the slab produced in a mold according to the invention has broad sides which are composed of three flat surfaces, the side surfaces being conical and the central surface being designed to be higher than the edge region.
  • This slab shape enables the slab to be centered better, especially at the strand withdrawal speeds which are customary today. This prevents uncontrolled movement of the strand in the mold and a so-called snaking in the strand guide frame.
  • the outer shape of the strand shell of the slab thus produced remains absolutely constant at least up to the bottom of the sump.
  • the only change to the slab is in the direction of thickness, whereby only the narrow sides are deformed.
  • the central mold width area namely the area designed as a trough, remains unchanged in its flat shape until it solidifies and ensures the most favorable lubrication conditions in the mold. Due to the mold shape according to the invention, the casting powder wets the strand surface in a definable amount in the area of greatest longitudinal crack sensitivity. Thanks to its flat shape, the strand shell is therefore not subject to any bending stress in this central mold width range, which favors the occurrence of cracks near the surface.
  • a separate cooling medium guide has a special influence on the solidification conditions of the strand shell in the area of the transition parts and the connecting part.
  • the subsequent strand guide scaffold has support and guide rollers which ensure safe transport of the slab, which still has a sump.
  • different roll forms are proposed, namely complete rolls or split rolls.
  • the 2/3 roll has a contour corresponding to the assignment of the middle part to the side part.
  • complete rolls can be used, in particular for smaller dimensions, which have the negative shape of the lower part of the mold as a contour.
  • Figures 1 and 2 show in perspective a mold with a downstream strand guide.
  • the mold has broad sides 21, between which narrow sides 22 are clamped.
  • the broad sides have a central surface 23, which is flat and is guided from the entrance to the mold mouth.
  • the central parts are arranged parallel to each other with respect to their height line and overall run conically towards one another in the strand conveying direction.
  • the middle parts 23 are connected to side parts 24 and 25 via transition parts 26 and 27.
  • transition parts 26 and 27 are wedge-shaped, the wedge tip 28 still being spaced within the mold by the distance a from the mold entrance.
  • Adjustment elements 31 are provided on the narrow sides 22, by means of which the narrow sides 22 clamped between the broad sides 21 can be adjusted to change the slab format.
  • Support and guide rollers 41 are provided below the mold.
  • Split rollers 43-45 having a cylindrical shape are shown in the present example.
  • b denotes the width of the central part 23.
  • the width b remains constant from the pouring area of the mold to the mold mouth.
  • the side plates In the pouring area, the side plates have a width f which, following the conical transition part 26 or 27, widen to the width g and keep this width constant up to the mouth of the mold.
  • the center plate has a width c in the pouring area, which widens following the wedge-shaped transition parts 26, 27 in the continuous casting direction up to the length a of the mold to the width b and from there remains constant until the mold opens.
  • the width f of the side plates 24 and 25 remains constant over the entire length L of the mold.
  • a dip spout 11 which has a tubular part 12 and a rectangular part 14, projects into the mold. Its mouth 13 protrudes below the melt level S P (dashed line).
  • FIG. 3 shows a section aa through the broad sides 21 of the mold.
  • the flat center plate 23 is shown, which merges at a distance a into a straight area which is parallel to the opposite center plate.
  • a first section of the center plate 23 is guided flat and parallel to the center axis I. This parallel part is followed by a tangential transition, a connecting part 29 which has an S-shaped shape in section and in turn merges into the parallel part of the center plate 23 in the direction of the mouth.
  • the spade-shaped part 14 of the immersion spout 11 projects into the mold to below the melt level S P.
  • the support and guide rollers 41 are shown below the mold.
  • the dashed line represents the distance D s of the side plates 24 and 25, and thus also the narrow side of the slab.
  • FIG. 4 shows a plan view of a broad side of the mold, together with the immersion spout 11 with its tubular part 12 and its rectangular part 14, as well as the mouth 13, which projects below the melt level S P.
  • the side plate 24 is shown, which has a constant width g.
  • the side plate 25 is shown, which has a width f in the entrance area of the mold, which has a width g conically following the conical transition part from the wedge tip 28.
  • the center plate 23 has a constant width b with a view of the left side of the figure.
  • the center plate 23 has a width c, which widens corresponding to the conical transition part 26 and has the constant width b from the wedge tip 28.
  • rollers 43, 44 are shown in the present figure, each of which has a cylindrical shape and are inclined towards one another in accordance with the inclination of the sides and the central surface of the slab that produces it.
  • the rollers shown in positions 3 and 4 of the stand consist of a 2/3 roller 46 and a cylindrical roller 44.
  • the roller 46 has a cylindrical section and a conical part which is adapted to the inclination of the side surfaces.
  • Positions 5 and 6 show rolls whose complete contour corresponds to the slab produced in the upstream mold, both in the middle area and in the side areas.
  • FIG. 5 shows a section through the guide frame and the slab, which also has a sump in this area.
  • the situation is shown with the opposing pairs of rollers in the central region 43 and in the side regions 44, 45. These rollers support the broad sides 51 of the shell box composed of the broad sides 51 and the narrow sides 52.
  • the shell box envelops the melt S, which forms the sump within the slab in this area.
  • a 2/3 roller 46 which supports the larger part of the slab broad side 51, and which is adjoined in the right part of the picture by a cylindrical roller 44 which supports the narrow side region.
  • the present sketch clearly shows the slab having a "crown", which can be guided exactly through the strand guide frame by the roll forms proposed here.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Description

Die Erfindung betrifft eine Stranggießanlage gemäß dem Oberbegriff des Patentanspruchs 1 und ein Verfahren zum Erzeugen von Dünnbrammen gemäß dem Oberbegriff des Patentanspruchs 8.The invention relates to a continuous caster according to the preamble of patent claim 1 and a method for producing thin slabs according to the preamble of patent claim 8.

Aus DE 41 31 829 C2 ist eine flüssigkeitsgekühlte breitenverstellbare Plattenkokille für das Stranggießen von Strängen aus Stahl im Brammenformat bekannt, insbesondere für eine Dicke der Brammen unter 100 mm, bei der die Form der Breitseitenplatten am Strangaustrittsende der Kokille dem zu erzeugenden Strangformat entspricht, wobei die Breitseitenplatten im Verstellbereich der Schmalseitenplatten als ebene Fläche ausgebildet sind.From DE 41 31 829 C2, a liquid-cooled, width-adjustable plate mold for the continuous casting of steel strands in slab format is known, in particular for a thickness of the slabs below 100 mm, in which the shape of the broad side plates at the strand exit end of the mold corresponds to the strand format to be produced, the Broad side plates are designed as a flat surface in the adjustment area of the narrow side plates.

Ein Hinweis, daß das zu erzeugende Strangformat eine Balligkeit auch nach Verlassen der Kokille aufweisen soll, ist dieser Schrift nicht zu entnehmen.This document does not indicate that the strand format to be produced should have a crown even after leaving the mold.

Aus DE 36 27 991 ist eine Einrichtung zum Stranggießen von flachen Brammen, insbesondere einer Stahlbramme mit einer Dicke unter 80 mm bekannt, bei der ein im Mittenbereich kleinerer gleichartig ausgewölbter Querschnitt auf der Strangaustrittsseite der Kokille dem größeren gewölbten Querschnitt auf der Eingießseite gegenübersteht und mindestens eine Rolle mindestens eines Rollenpaares der der Kokille nachgeordneten Stützund Führungsmittel ein dem austretenden ausgewölbten Strang angepaßtes Kaliber aufweist.From DE 36 27 991 a device for the continuous casting of flat slabs, in particular a steel slab with a thickness of less than 80 mm, is known, in which a smaller, similarly arched cross section on the strand exit side of the mold faces the larger, curved cross section on the pouring side and at least one Roll of at least one pair of rolls which has a supporting and guiding means arranged downstream of the mold and a caliber which is adapted to the emerging bulging strand.

Die aus dieser Schrift bekannte Kokillenform wie auch die Form der der Kokille nachgeordneten Stütz- und Führungsmittel sind derart ausgestaltet, daß im Kantenbereich die Kokille eine dem Strangformat angepaßte Form aufweist, also bereits in der Kokille parallele Seitenwandbereiche vorhanden sind, die sich bei den Stütz- und Führungsrollen des Strangführungsgerüstes fortsetzen.The mold shape known from this document as well as the shape of the support and guide means arranged downstream of the mold are designed such that the mold has a shape adapted to the strand format in the edge region, that is to say Parallel side wall areas are already present in the mold and continue with the support and guide rollers of the strand guide frame.

Aus DE 44 03 0 45 ist eine Stranggießanlage zum Führen von Strängen bekannt, deren Breitseitenplatten konkav ausgeführt sind und die Konkavität von der Oberkante der Kokille bis zum Austritt der Kokille und darüber hinaus bis zur letzten Rolle der Strangführung konstant ist. Die konkave Form verläuft dabei in vorteilhafter Weise vom Beginn der einen Schmalseitenplatte bis zum Beginn der anderen, gegenüberliegenden Schmalseitenplatte.From DE 44 03 0 45 a continuous caster for guiding strands is known, the broad side plates of which are concave and the concavity is constant from the upper edge of the mold to the exit of the mold and beyond to the last roll of the strand guide. The concave shape advantageously extends from the beginning of one narrow side plate to the beginning of the other, opposite narrow side plate.

Die aus dieser Schrift bekannte konkave Form der Breitseitenplatten betreffen eine relativ komplizierte Form, die im wesentlichen von der Durchbiegung der Rolle und dem aktuellen Verschleiß beeinflußt wird.The concave shape of the broad side plates known from this document relates to a relatively complicated shape which is essentially influenced by the deflection of the roller and the current wear.

Die Strangschale im mittleren Kokillen-Breiten-Bereich und somit im Trichterbereich unterliegt in Folge der Abzugsbewegung bis zum Austritt aus dem Trichterbereich in nachteiliger Weise einer stetigen Biegeverformung.The strand shell in the central mold width area and thus in the funnel area is subject to a continuous bending deformation due to the withdrawal movement until it emerges from the funnel area.

In den genannten Schriften ist in Bezug auf die Strangdickenverformung mit flüssigem Sumpf direkt unterhalb der Kokille, dem sogenannten cast rolling, die Abstufung der Dicken-Reduktions-Schritte bezüglich des Breitenprofils des Stranges nicht eindeutig definierbar.In the cited documents, the grading of the thickness reduction steps with respect to the width profile of the strand cannot be clearly defined in relation to the strand thickness deformation with liquid sump directly below the mold, the so-called cast rolling.

Die Erfindung strebt das Ziel an, mit einfachen konstruktiven Mitteln eine Stranggießeinrichtung mit einer Kokille und Strangführungsrollen zu schaffen, die die Belastung der Strangschale mindern und die Gefahr von Längsrissen wie auch von Durchbrüchen minimieren.The invention aims to provide a continuous casting device with a mold and strand guide rollers with simple structural means, which reduce the load on the strand shell and minimize the risk of longitudinal cracks and breakthroughs.

Die Erfindung erreicht dieses Ziel durch die Merkmale des Anspruchs 1 und des Verfahrensanspruchs 8. Die Unteransprüche zeigen vorteilhafte Weiterbildungen der Erfindung.The invention achieves this aim by the features of claim 1 and method claim 8. The subclaims show advantageous developments of the invention.

Erfindungsgemäß sind die Kokillenbreitseiten weitgehend aus ebenen Flächenteilen zusammengesetzt und die Strangführungsrollen weisen eine Kontur auf, die im wesentlichen aus Geraden sich zusammensetzt. Bereits von dem Eingang der Kokille an ist im Mittenbereich eine ebene Fläche vorgesehen, die in Strangführungsrichtung beibehalten wird und über die Mündung der Kokille hinaus von den Mittenteilen der Führungsrollen vollständig übernommen wird.According to the mold broad sides are largely composed of flat surface parts and the strand guide rollers have a contour that is composed essentially of straight lines. Already from the entrance of the mold, a flat surface is provided in the central area, which is maintained in the strand guide direction and is completely taken over by the central parts of the guide rollers beyond the mouth of the mold.

Zu beiden Seiten dieses ebenen Mittenteils sind ebenfalls ebene Flächen in Richtung der Schmalseiten vorgesehen. Diese ebenen Flächen werden sowohl in ihrer Form wie auch in ihrer Neigung vom Eingang der Kokille an bis Ende des Strangführungsgerüstes exakt beibehalten.Flat surfaces in the direction of the narrow sides are also provided on both sides of this flat central part. The shape and inclination of these flat surfaces are exactly maintained from the entrance of the mold to the end of the strand guide frame.

Zwischen der ebenen Mittenfläche der Kokille und den an beiden Seiten angeordneten ebenen Seitenflächen sind Übergangsstücke vorgesehen. Die Erstreckung dieser Übergangsstücke endet innerhalb der Kokille, so daß der untere Bereich dem Strangformat entspricht. Darüber hinaus erlaubt diese Form ein einfaches Einbringen und Ausfördern des Kaltstranges beim Angießen der Stranggießanlage.Transition pieces are provided between the flat central surface of the mold and the flat side surfaces arranged on both sides. The extension of these transition pieces ends within the mold, so that the lower area corresponds to the strand format. In addition, this shape allows the cold strand to be introduced and removed easily when the continuous casting machine is cast on.

In einer vorteilhaften Ausgestaltung ist im Eingießbereich das Mittenteil ebenflächig ausgestaltet. Die ebenen Mittenteile beider Brammen-Breitseiten laufen in Strangrichtung konisch aufeinander zu, bis sie innerhalb der Kokille eine sogenannte Crown bildend parallel bis zur Kokillenmündung geführt werden.In an advantageous embodiment, the middle part is designed to be flat in the pouring area. The flat central parts of both broad slab sides taper towards each other in the strand direction until they are guided within the mold parallel to the mold mouth, forming a so-called crown.

In einer weiteren vorteilhaften Ausgestaltung sind die Mittenteile im Eingießbereich ebenflächig und parallel geführt und außerhalb des Schattenbereichs des Tauchausgußes in Strangführungsrichtung durch ein Verbindungsteil mit dem die "Crown" aufweisenden Mittelteil im Mündungsbereich der Kokille verbunden. Die Mittenteile weisen dabei eine Form auf, deren Höhenlinien zueinander parallel sind und deren Längserstreckung in Strangförderrichtung S-förmig ausgestaltet sind. Die Mündung dieser S-Form geht jeweils tangential in die benachbarten Flächen über.In a further advantageous embodiment, the central parts in the pouring area are flat and parallel and outside the shadow area of the Dipping spout in the strand guide direction is connected by a connecting part to the central part having the "crown" in the mouth region of the mold. The central parts have a shape, the contour lines of which are parallel to one another and the longitudinal extension of which is S-shaped in the strand conveying direction. The mouth of this S-shape merges tangentially into the neighboring areas.

Die in einer erfindungsgemäßen Kokille erzeugten Bramme besitzt Breitseiten, die sich aus drei ebenen Flächen zusammensetzt, wobei die Seitenflächen konisch ausgestaltet sind und die Mittenfläche im Vergleich zum Kantenbereich erhöht ausgestaltet ist. Durch diese Brammenform wird ein besseres Zentrieren der Bramme, gerade bei den heute üblichen Strangabzugsgschwindigkeiten, möglich. Ein unkontrolliertes Bewegen des Stranges in der Kokille und ein Schlingeln, das sogenannte Snaking, im Strangführungsgerüst wird hierdurch vermieden.The slab produced in a mold according to the invention has broad sides which are composed of three flat surfaces, the side surfaces being conical and the central surface being designed to be higher than the edge region. This slab shape enables the slab to be centered better, especially at the strand withdrawal speeds which are customary today. This prevents uncontrolled movement of the strand in the mold and a so-called snaking in the strand guide frame.

Die äußere Form der Strangschale der so erzeugten Bramme bleibt mindestens bis zur Sumpfspitze absolut konstant. Die einzige Änderung der Bramme erfolgt in Dickenrichtung, wobei ausschließlich die Schmalseiten verformt werden.The outer shape of the strand shell of the slab thus produced remains absolutely constant at least up to the bottom of the sump. The only change to the slab is in the direction of thickness, whereby only the narrow sides are deformed.

Der mittlere Kokillenbreitenbereich, und zwar der als Trog ausgestaltete Bereich, bleibt in seiner ebenen Form unverändert bis zum Durcherstarren und gewährleistet in der Kokille die günstigsten Schmierbedingungen. Durch die erfindungsgemäße Kokillenform benetzt das Gießpulver im Bereich der größten Längsrißempfindlichkeit die Strangoberfläche in sicher vorgebbarer Menge. Die Strangschale unterliegt also in diesem mittleren Kokillen-Breiten-Bereich dank ihrer ebenen Form keinerlei Biegespannung, die das Auftreten von oberflächennahen Rissen begünstigt.The central mold width area, namely the area designed as a trough, remains unchanged in its flat shape until it solidifies and ensures the most favorable lubrication conditions in the mold. Due to the mold shape according to the invention, the casting powder wets the strand surface in a definable amount in the area of greatest longitudinal crack sensitivity. Thanks to its flat shape, the strand shell is therefore not subject to any bending stress in this central mold width range, which favors the occurrence of cracks near the surface.

Besonderen Einfluß auf die Erstarrungsverhältnisse der Strangschale im Bereich der Übergangsteile und des Verbindungsteils wird durch eine separate Kühlmedienführung genommen.A separate cooling medium guide has a special influence on the solidification conditions of the strand shell in the area of the transition parts and the connecting part.

Das anschließende Strangführungsgerüst weist Stütz- und Führungsrollen auf, die einen sicheren Transport der noch einen Sumpf aufweisenden Bramme gewährleisten. Erfindungsgemäß werden verschiedene Rollenformen vorgeschlagen, und zwar Komplettrollen oder auch geteilte Rollen.The subsequent strand guide scaffold has support and guide rollers which ensure safe transport of the slab, which still has a sump. According to the invention, different roll forms are proposed, namely complete rolls or split rolls.

Bei den geteilten Rollen kommen einfache Zylinderrollen zum Einsatz, die zueinander entsprechend der Ausgestaltung der Mitten- bzw. Seitenflächen der von der Kokille vorgegebenen Brammenform angepaßt ist.In the case of the divided rollers, simple cylindrical rollers are used, which are adapted to one another in accordance with the configuration of the center or side surfaces of the slab shape specified by the mold.

Weiterhin wird vorgeschlagen, die Rollen im Verhältnis 2/3 zur 1/3 aufzuteilen, und diese Aufteilung abwechselnd durchzuführen. Hierbei besitzt die 2/3-Rolle eine der Zuordnung des Mittenteils zum Seitenteil entsprechende Kontur.It is also proposed to split the roles in a 2/3 to 1/3 ratio and to carry out this split alternately. Here, the 2/3 roll has a contour corresponding to the assignment of the middle part to the side part.

In Abhängigkeit der Brammenbreite können insbesondere bei kleineren Abmessungen Komplettrollen zum Einsatz kommen, die als Kontur die Negativform des unteren Teils der Kokille aufweisen.Depending on the width of the slab, complete rolls can be used, in particular for smaller dimensions, which have the negative shape of the lower part of the mold as a contour.

Ein Beispiel der Erfindung ist in der beiliegenden Zeichnung dargelegt. Dabei zeigen:

Figur 1
Stranggießkokille mit konstantem Mittenteil
Figur 2
Stranggießkokille mit konstanten Seitenteilen
Figur 3
Schnitt durch die Stranggießeinrichtung
Figur 4
Draufsicht auf die Stranggießeinrichtung
Figur 5
Schnitt durch das Strangführungsgerüst
An example of the invention is set out in the accompanying drawing. Show:
Figure 1
Continuous casting mold with constant middle part
Figure 2
Continuous casting mold with constant side parts
Figure 3
Section through the continuous caster
Figure 4
Top view of the continuous caster
Figure 5
Section through the strand guide frame

Die Figuren 1 und 2 zeigen perspektivisch eine Kokille mit nachgeschaltetem Strangführungsgerüst.Figures 1 and 2 show in perspective a mold with a downstream strand guide.

Die Kokille weist dabei Breitseiten 21 auf, zwischen denen Schmalseiten 22 eingeklemmt sind. Die Breitseiten besitzen eine Mittenfläche 23, die ebenflächig ausgestaltet ist und von dem Eingang bis zur Kokillenmündung geführt ist.The mold has broad sides 21, between which narrow sides 22 are clamped. The broad sides have a central surface 23, which is flat and is guided from the entrance to the mold mouth.

Im Eingießbereich bis zu einer Länge a vom Eingang der Kokille gerechnet, sind die Mittenteile bezüglich ihrer Höhenlinie zueinander parallel angeordnet und verlaufen insgesamt konisch in Strangförderrichtung aufeinander zu. In diesem Bereich sind die Mittenteile 23 über Übergangsteile 26 und 27 mit Seitenteilen 24 und 25 verbunden.Calculated in the pouring area up to a length a from the entrance of the mold, the central parts are arranged parallel to each other with respect to their height line and overall run conically towards one another in the strand conveying direction. In this area, the middle parts 23 are connected to side parts 24 and 25 via transition parts 26 and 27.

Die Übergangsteile 26 und 27 sind keilförmig ausgestaltet, wobei die Keilspitze 28 noch innerhalb der Kokille mit dem Abstand a zum Kokilleneingang beabstandet ist.The transition parts 26 and 27 are wedge-shaped, the wedge tip 28 still being spaced within the mold by the distance a from the mold entrance.

An den Schmalseiten 22 sind Verstellelemente 31 vorgesehen, durch die die zwischen den Breitseiten 21 eingeklemmten Schmalseiten 22 zur Veränderung des Brammenformats verstellbar sind.Adjustment elements 31 are provided on the narrow sides 22, by means of which the narrow sides 22 clamped between the broad sides 21 can be adjusted to change the slab format.

Unterhalb der Kokille sind Stütz- und Führungsrollen 41 vorgesehen. Im vorliegenden Beispiel sind geteilte, eine zylindrische Form aufweisende Rollen 43-45 dargestellt.Support and guide rollers 41 are provided below the mold. Split rollers 43-45 having a cylindrical shape are shown in the present example.

In der Figur 1 ist mit b die Breite des Mittenteils 23 bezeichnet. In der vorliegenden Figur bleibt die Breite b beginnend im Eingießbereich der Kokille konstant bis zur Kokillenmündung.In Figure 1, b denotes the width of the central part 23. In the present figure, the width b remains constant from the pouring area of the mold to the mold mouth.

Im Eingießbereich weisen die Seitenplatten eine Breite f auf, die sich dem konischen Übergangsteil 26 oder 27 folgend auf die Breite g verbreitem und diese Breite konstant bis zur Mündung der Kokille beibehalten.In the pouring area, the side plates have a width f which, following the conical transition part 26 or 27, widen to the width g and keep this width constant up to the mouth of the mold.

In der Figur 2 hat im Eingießbereich die Mittenplatte eine Breite c, die sich den keilförmigen Übergangsteilen 26, 27 folgend in Stranggießrichtung bis zur Länge a der Kokille auf die Breite b verbreitert und ab dort bis zur Mündung der Kokille konstant bleibt.In FIG. 2, the center plate has a width c in the pouring area, which widens following the wedge-shaped transition parts 26, 27 in the continuous casting direction up to the length a of the mold to the width b and from there remains constant until the mold opens.

Bei dieser Ausgestaltung bleibt die Breite f der Seitenplatten 24 und 25 über die gesamte Länge L der Kokille konstant.In this embodiment, the width f of the side plates 24 and 25 remains constant over the entire length L of the mold.

In die Kokille ragt ein Tauchausguß 11, der einen rohrförmigen Teil 12 und einen rechteckigen Teil 14 besitzt. Seine Mündung 13 ragt bis unterhalb des Schmelzenpegels SP (gestrichelte Linie).A dip spout 11, which has a tubular part 12 and a rectangular part 14, projects into the mold. Its mouth 13 protrudes below the melt level S P (dashed line).

Die Figur 3 zeigt einen Schnitt aa durch die Breitseiten 21 der Kokille.FIG. 3 shows a section aa through the broad sides 21 of the mold.

Im linken Teil der Figur ist die ebenflächige Mittenplatte 23 dargestellt, die im Abstand a in ein geraden parallel zur gegenüberliegenden Mittenplatte geführten Bereich übergeht.In the left part of the figure, the flat center plate 23 is shown, which merges at a distance a into a straight area which is parallel to the opposite center plate.

Im rechten Teil der Figur ist ein erster Abschnitt der Mittenplatte 23 ebenflächig und parallel zur Mittenachse I geführt. An diesen parallelen Teil schließt sich mit tangentialem Übergang ein Verbindungsteil 29 an, das im Schnitt eine s-förmige Gestalt besitzt und wiederum in den parallelen Teil der Mittenplatte 23 in Richtung der Mündung übergeht.In the right part of the figure, a first section of the center plate 23 is guided flat and parallel to the center axis I. This parallel part is followed by a tangential transition, a connecting part 29 which has an S-shaped shape in section and in turn merges into the parallel part of the center plate 23 in the direction of the mouth.

Im Eingangsbereich ragt in die Kokille bis unterhalb des Schmelzenpegels SP der spatenförmige Teil 14 des Tauchausgußes 11.In the entrance area, the spade-shaped part 14 of the immersion spout 11 projects into the mold to below the melt level S P.

Unterhalb der Kokille sind die Stütz- und Führungsrollen 41 dargestellt.The support and guide rollers 41 are shown below the mold.

Die gestrichelte Linie stellt den Abstand Ds der Seitenplatten 24 bzw. 25 dar, und damit auch die Schmalseite der Bramme.The dashed line represents the distance D s of the side plates 24 and 25, and thus also the narrow side of the slab.

In der Figur 4 ist eine Draufsicht auf eine Kokillenbreitseite dargestellt, zusammen mit dem Tauchausguß 11 mit seinem rohrförmigen Teil 12 und seinem rechteckigen Teil 14 sowie der Mündung 13, die bis unterhalb des Schmelzenpegels SP ragt.FIG. 4 shows a plan view of a broad side of the mold, together with the immersion spout 11 with its tubular part 12 and its rectangular part 14, as well as the mouth 13, which projects below the melt level S P.

Im rechten Teil der Figur ist die Seitenplatte 24 dargestellt, die eine konstante Breite g besitzt.In the right part of the figure, the side plate 24 is shown, which has a constant width g.

Im linken Teil der Figur ist die Seitenplatte 25 dargestellt, die im Eingangsbereich der Kokille eine Breite f aufweist, die sich dem konischen Übergangsteil konisch folgend ab der Keilspitze 28 eine Breite g besitzt.In the left part of the figure, the side plate 25 is shown, which has a width f in the entrance area of the mold, which has a width g conically following the conical transition part from the wedge tip 28.

Die Mittenplatte 23 besitzt mit Blick auf die linke Seite der Figur eine konstante Breite b.The center plate 23 has a constant width b with a view of the left side of the figure.

Mit Blick auf die rechte Seite besitzt die Mittenplatte 23 eine Breite c, die sich entsprechend dem konischen Übergangsteil 26 verbreitert und ab der Keilspitze 28 die konstante Breite b besitzt.With a view of the right side, the center plate 23 has a width c, which widens corresponding to the conical transition part 26 and has the constant width b from the wedge tip 28.

Unterhalb der Kokille sind verschiedene Rollen 43, 44 dargestellt.Various rollers 43, 44 are shown below the mold.

Unmittelbar der Kokille nachfolgend sind in der vorliegenden Figur insgesamt drei Rollen 43, 44 dargestellt, die jeweils eine zylindrische Form besitzen und zueinander entsprechend der Neigung der Seiten und der Mittenfläche der erzeugenden Bramme einander zugeneigt sind.Immediately following the mold, a total of three rollers 43, 44 are shown in the present figure, each of which has a cylindrical shape and are inclined towards one another in accordance with the inclination of the sides and the central surface of the slab that produces it.

Die auf der Position 3 und 4 des Gerüstes dargestellten Rollen bestehen aus einer 2/3-Rolle 46 und einer zylindrischen Rolle 44. Die Rolle 46 besitzt einen zylindrischen Abschnitt und einen der Neigung der Seitenflächen angepaßten konischen Teil.The rollers shown in positions 3 and 4 of the stand consist of a 2/3 roller 46 and a cylindrical roller 44. The roller 46 has a cylindrical section and a conical part which is adapted to the inclination of the side surfaces.

Auf den Positionen 5 und 6 sind Rollen dargestellt, deren Komplettkontur der in der vorgeschalteten Kokille erzeugten Bramme sowohl im Mittenbereich wie auch in den Seitenbereichen entspricht.Positions 5 and 6 show rolls whose complete contour corresponds to the slab produced in the upstream mold, both in the middle area and in the side areas.

Die Figur 5 zeigt einen Schnitt durch das Führungsgerüst und die in diesem Bereich noch einen Sumpf aufweisende Bramme. Im oberen Teil des Bildes ist die Situation dargestellt mit den sich gegenüberliegenden Rollenpaaren im Mittenbereich 43 und in den Seitenbereichen 44, 45. Diese Rollen stützen die Breitseiten 51 des sich aus den Breitseiten 51 und den Schmalseiten 52 zusammensetzenden Schalenkastens. Der Schalenkasten umhüllt dabei die Schmelze S, die in diesem Bereich den Sumpf innerhalb der Bramme bildet.FIG. 5 shows a section through the guide frame and the slab, which also has a sump in this area. In the upper part of the picture the situation is shown with the opposing pairs of rollers in the central region 43 and in the side regions 44, 45. These rollers support the broad sides 51 of the shell box composed of the broad sides 51 and the narrow sides 52. The shell box envelops the melt S, which forms the sump within the slab in this area.

Im unteren Bereich ist die Situation mit einer Komplettrolle 42 dargestellt, die einen zylindrischen Mittelteil und konisch vergrößernde Seitenbereiche besitzt.In the lower area, the situation is shown with a complete roller 42, which has a cylindrical middle part and conically enlarging side areas.

Weiterhin ist eine 2/3-Rolle 46 dargestellt, die den größeren Teil der Brammenbreitseite 51 stützt, und an die sich im rechten Teil des Bildes eine zylindrische Rolle 44 anschließt, die den Schmalseitenbereich stützt.Furthermore, a 2/3 roller 46 is shown, which supports the larger part of the slab broad side 51, and which is adjoined in the right part of the picture by a cylindrical roller 44 which supports the narrow side region.

Die vorliegende Skizze zeigt deutlich die eine "Crown" aufweisende Bramme, welche durch die hier vorgeschlagenen Rollenformen exakt durch das Strangführungsgerüst führbar ist.The present sketch clearly shows the slab having a "crown", which can be guided exactly through the strand guide frame by the roll forms proposed here.

Positionslisteposition list Zufuhrsupply

1111
TauchausgußA submerged nozzle
1212
Rohrförmiger TeilTubular part
1313
Spatenförmige MündungSpade-shaped mouth
1414
Rechteckiger TeilRectangular part
KokilleneinrichtungMold device

2121
KokillenbreitseitenKokillenbreitseiten
2222
Kokillenschmalseitenmold narrow
2323
Mittenflächecenter space
2424
Erste SeitenflächeFirst side surface
2525
Zweite SeitenflächeSecond side surface
2626
Erstes ÜbergangsteilFirst transition part
2727
Zweites ÜbergangsteilSecond transition part
2828
KeilspitzeKeilspitze
2929
Verbindungsteilconnecting part
Verstelleinrichtungadjustment

3131
Verstellelementadjustment
Führungseinrichtungguide means

4141
Stütz- und FührungsrollenSupport and guide roles
4242
Bombierte RolleCurved roll
4343
Geteilte Rolle MitteSplit roll center
4444
Geteilte Rolle 1. SeiteSplit roll 1st page
4545
Geteilte Rolle 2. SeiteSplit roll 2nd side
4646
2/3-Rolle2/3-roll
4747
Lagercamp
DS D S
Abstand SchmalseitenDistance narrow sides
DE D E
Größter Abstand BreitseitenGreatest distance broadsides
dd
Dicke TauchausgußThick diving spout
SS
Schmelzemelt
SP S P
Schmelzenpegelmelt level
BB
Strangschalestrand shell
LL
Kokillenlängemold length
aa
Entfernung von KokilleneingangRemoval of mold entrance
bb
Konstante Breite MittenteilConstant width of the middle part
cc
Breite Mittenteil EingießbereichWide center part pouring area
ff
Breite Eingießbereich SeitenteilWide pouring area side part
gG
Konstante Breite SeitenteilConstant width side part
II
Mittenachsemid-axis

Claims (10)

  1. A continuous-casting installation for producing thin slabs with a mould having adjustable sides, the broad sides (21) of which mould at least in the region of adjustment of the narrow sides (22) of the mould are in the form of plane side faces (24, 25),
    into which a submerged nozzle (11) protrudes, and in which a cross-section which is convex in the middle region on the billet exit side lies opposite a larger bulging cross-section on the pour-in side, and with pairs of support and guidance rollers succeeding the mould which have a roll pass adapted to the emerging convex billet,
    characterised in that
    a) the submerged nozzle (11) has a spade-like end piece (13) which receives the mouth and has a maximum thickness (d) corresponding to d = 0.3 to 0.5 x DE, DE being the distance between the broad sides (21) of the mould in the pour-in region,
    b) the broad sides (21) of the mould have centre parts (23) at least in the shroud area of the submerged nozzle (11) which are arranged parallel to each other with respect to their contour lines,
    c) the plane side faces (24, 25) are made conical in the direction of the narrow sides (22) of the mould,
    d) the plane-surface centre parts (23) are joined to the plane-surface side faces (24, 25) by transition parts (26, 27),
    e) the transition parts (26, 27) taper in a wedge shape in the direction of conveyance of the billet and the wedge tip (28) ends at a distance (a), measured from the upper edge of the mould, of a = 0.5 to 0.8 x L, L being the mould length, and
    f) that the support and guidance rollers (41) have a contour which corresponds to the plane-surface centre part (23) and the plane side faces (24, 25) of the broad sides (21) of the mould in the mouth region of the mould.
  2. A continuous-casting installation according to Claim 1, characterised in that the centre plates (23) are in the form of plane surfaces which approach each other conically in the direction of conveyance of the billet at an angle α where α = 5 to 10° at a = 0.5 to 0.8 x L.
  3. A continuous-casting installation according to Claim 1, characterised in that the centre parts (23) in the shroud area of the submerged nozzle (11) up to a = 0.5 to 0.8 x L are made with plane surfaces and arranged guided parallel to each other, and
    that connecting parts (29) are provided which are parallel with respect to their contour lines and have an S-shaped form in the direction of conveyance of the billet, their ends in each case merging tangentially into the preceding and subsequent part of the centre parts (23) and their transition parts (26, 27) being matched in their longitudinal extent to the connecting part (29) as far as the tip of the wedge (28).
  4. A continuous-casting installation according to Claim 1, characterised in that the transition parts (26, 27) are formed as a bulging surface, the bulging surface adjoining tangentially at one end the respective side faces (24, 25) and at the other end the centre parts (23) and having a reversal point in the centre.
  5. A continuous-casting installation according to Claim 1, characterised in that the support and guidance rollers (41) are in the form of divided rollers (42-44), the respective bearings (47) being provided in the region of the plane-surface centre parts (23).
  6. A continuous-casting installation according to Claim 1, characterised in that rollers are provided which correspond to the shape of the slab in the guide stand, which rollers are cylindrical in the centre region and are conical in the lateral regions with a diameter which increases outwards.
  7. A continuous-casting installation according to Claims 1 or 4, characterised in that the transition parts (26, 27) are connected to a separate cooling means.
  8. A method for the production of thin slabs with a predetermined camber of their broad sides in a continuous-casting installation, in which a submerged nozzle serving to supply the melt projects into a mould which is composed of broad and narrow sides and which is succeeded by a billet guide, by means of which the slab, the billet shell of which surrounds the still-liquid liquid core, is guided,
    characterised by the following steps:
    a) the broad sides of the billet shell become plane-surfaced in the region of a spade-like submerged nozzle, and in so doing parallel with respect to their contour lines,
    b) outside the shroud area of the submerged nozzle formed with a plane surface and conically tapering towards the narrow sides;
    c) in the continuous casting direction, the slab broad-side centre parts which are formed with a plane surface and located inside the shroud area are guided to each other conically up to a longitudinal extend of the mould of 40 to 60% such that their lateral edges adapt to the ends of the plane slab broad-side parts which taper conically towards the narrow sides, and
    d) wedge-shaped connecting surfaces join with the plane-surface slab broad-side centre parts and the respective plane-surface slab broad-side edge parts located outside the shroud area of the submerged nozzle;
    e) then in the mouth region and also after leaving the mould the camber formed by in each case three plane surface parts of the broad sides of the billet shell is kept of constant form as far as the tip of the liquid core of the slab.
  9. A method according to Claim 8, characterised in that to reduce the thickness of the slab in the region of the billet guidance stand exclusively the narrow sides of the slab are deformed.
  10. A method according to Claim 8, characterised in that the wedge-shaped transitions between the plane slab centre part located in the shroud area of the submerged nozzle and the slab broad-side parts tapering conically towards the narrow sides are given a form which in the longitudinal extents of the slab centre parts encloses an angle α < 5° and represents a bulging surface, which has centrally a reversal point and at its edges adjoins the two neighbouring surfaces tangentially.
EP98936178A 1997-06-30 1998-06-15 Method and device for producing thin slabs Expired - Lifetime EP0996514B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19728957A DE19728957A1 (en) 1997-06-30 1997-06-30 Method and device for producing thin slabs
DE19728957 1997-06-30
PCT/DE1998/001633 WO1999001244A1 (en) 1997-06-30 1998-06-15 Method and device for producing thin slabs

Publications (2)

Publication Number Publication Date
EP0996514A1 EP0996514A1 (en) 2000-05-03
EP0996514B1 true EP0996514B1 (en) 2003-09-10

Family

ID=7834893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98936178A Expired - Lifetime EP0996514B1 (en) 1997-06-30 1998-06-15 Method and device for producing thin slabs

Country Status (11)

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US (1) US6810943B2 (en)
EP (1) EP0996514B1 (en)
KR (1) KR100573751B1 (en)
AR (1) AR012755A1 (en)
AT (1) ATE249299T1 (en)
AU (1) AU8531998A (en)
BR (1) BR9811275A (en)
DE (2) DE19728957A1 (en)
TR (1) TR199903303T2 (en)
TW (1) TW372204B (en)
WO (1) WO1999001244A1 (en)

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CN110198795A (en) * 2016-11-18 2019-09-03 达涅利机械设备股份公司 Continuous casting apparatus for sheet billet

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DE19742795A1 (en) † 1997-09-27 1999-04-01 Schloemann Siemag Ag Funnel geometry of a mold for the continuous casting of metal
AT410766B (en) * 2001-09-28 2003-07-25 Voest Alpine Ind Anlagen ended mold
KR100940680B1 (en) * 2002-12-27 2010-02-08 주식회사 포스코 A funnel mold for thin slab continuous casting
DE102005028703A1 (en) * 2005-06-20 2006-12-28 Siemens Ag Regulating and or controlling method e.g. for adjusting segment in continuous casting installation, involves having lower frame and upper frame positioned in relation to each other by adjusting elements
DE202012004204U1 (en) * 2011-05-03 2012-06-15 Central Iron & Steel Research Institute Bevelled narrow-side copper plate for casting mold with funnel-shaped curved surface

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US4716955A (en) * 1986-06-11 1988-01-05 Sms Concast Inc. Continuous casting method
DE3627991A1 (en) * 1986-08-18 1988-02-25 Mannesmann Ag METHOD FOR CONTINUOUSLY MOLDING SLABS AND DEVICE FOR CARRYING OUT THE METHOD
DE3640525C2 (en) * 1986-11-27 1996-02-15 Schloemann Siemag Ag Mold for the continuous casting of steel strip
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Publication number Priority date Publication date Assignee Title
CN110198795A (en) * 2016-11-18 2019-09-03 达涅利机械设备股份公司 Continuous casting apparatus for sheet billet
CN110198795B (en) * 2016-11-18 2021-06-01 达涅利机械设备股份公司 Continuous casting device for thin slabs

Also Published As

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KR100573751B1 (en) 2006-04-24
TW372204B (en) 1999-10-21
TR199903303T2 (en) 2000-07-21
DE19728957A1 (en) 1999-01-07
WO1999001244A1 (en) 1999-01-14
BR9811275A (en) 2000-07-18
US20030150589A1 (en) 2003-08-14
DE59809580D1 (en) 2003-10-16
AR012755A1 (en) 2000-11-08
KR20010014325A (en) 2001-02-26
EP0996514A1 (en) 2000-05-03
US6810943B2 (en) 2004-11-02
ATE249299T1 (en) 2003-09-15
AU8531998A (en) 1999-01-25

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