EP0323958B1 - Device for continuous casting of flat slabs - Google Patents

Device for continuous casting of flat slabs Download PDF

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Publication number
EP0323958B1
EP0323958B1 EP19870905187 EP87905187A EP0323958B1 EP 0323958 B1 EP0323958 B1 EP 0323958B1 EP 19870905187 EP19870905187 EP 19870905187 EP 87905187 A EP87905187 A EP 87905187A EP 0323958 B1 EP0323958 B1 EP 0323958B1
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EP
European Patent Office
Prior art keywords
casting
mould
pouring
rollers
bulging
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
Application number
EP19870905187
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German (de)
French (fr)
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EP0323958A1 (en
Inventor
Hans Schrewe
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
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Mannesmann AG
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Filing date
Publication date
Family has litigation
Priority to DE3627991 priority Critical
Priority to DE19863627991 priority patent/DE3627991C2/de
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority claimed from AT87905187T external-priority patent/AT64115T/en
Publication of EP0323958A1 publication Critical patent/EP0323958A1/en
Application granted granted Critical
Publication of EP0323958B1 publication Critical patent/EP0323958B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6307639&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0323958(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408Moulds for casting thin slabs

Abstract

A process for continuously casting slabs having a considerably greater width than thickness, especially steel slabs less than 80 mm thick. The molten mass is poured from a casting container (1) into a chill mould (3) having on the pouring-in side a cross-section that is larger in a central area than the desired casting format and similar thereto in its edges. In order to obtain a process and device that allow steel slabs less than 80 mm thick to be faultlessly produced with a surface finish of high quality, the cross-sectional form of the pouring-in side of the chill mould is maintained along its whole length and the casting shell of the central zone of the casting (7) that comes out of the chill mould is deformed by supporting and guiding means (8) arranged directly after the chill mould, so that the casting shell, after passing through the deforming section, lies on the plane of the slab surface of the edge area (11).

Description

  • Die vorliegende Erfindung betrifft eine Einrichtung zum Stanggießen von flachen Brammen gemäß dem Oberbegriff des Patentanspruchs 1.The present invention relates to a device for the continuous casting of flat slabs according to the preamble of claim 1.
  • Eine Stranggießkokille dieser Art ist aus der GB-A-11 99 805 bekannt, wobei hier nicht nur die Querschnittsform, sondern auch der Querschnitt selbst von der Eintrittsseite bis zur Ausstrittsseite der Kokille gleich bleibt. Die endgültige Strangquerschnittsform wird durch die im Anschluß an die Kokille angeordnete Walzen allein gebildet.A continuous casting mold of this type is known from GB-A-11 99 805, where not only the cross-sectional shape, but also the cross-section itself remains the same from the inlet side to the outlet side of the mold. The final strand cross-sectional shape is formed solely by the rollers arranged after the mold.
  • Aus der EP-A2 0 149 734 ist weiterhin eine Kokille zum Stranggießen von Stahlband bekannt, bei der die Breitseitenwände einen oberen trichterförmigen Eingießbereich bilden.From EP-A2 0 149 734 a mold for the continuous casting of steel strip is also known, in which the broad side walls form an upper funnel-shaped pouring area.
  • Schließlich ist aus der DE-A1-34 00 220 eine Kokille bekannt, die den Nachteil hat, daß am Übergang vom querschnittsvergrößernden Eingießbereich zum gewünschten Strangformat innerhalb der Kokille starke Biegebeanspruchungen der Strangschale auftreten. Zur Verringerung der Biegebeaspruchung muß zum einen der Umformwinkel α klein gehalten und zum anderen Gießund Abkülgeschwindigkeit in so engen Grenzen gewählt werden, daß die Strangschhale ohne Anrisse ausgefördert werden kann. Bei dieser Art der Ausbildung der Kokille tritt am Übergang eine starke Reibung auf, die auch durch die bereits bekante Schmierung nur in einem gerigen Umfang verringert werden kann. Die bekannte Kokille hat noch den weiteren Nachteil, daß unter Beibehaltung eines kleinen Umforwinkels α, vorzugsweise < 10°, die Kokille um so länger gemacht werden muß, je geringer die Dicke der Bramme sein soll.Finally, a mold is known from DE-A1-34 00 220, which has the disadvantage that strong bending stresses of the strand shell occur at the transition from the pouring area which increases the cross-section to the desired strand format within the mold. To reduce the bending stress, on the one hand, the forming angle α must be kept small and, on the other hand, the casting and cooling speed must be selected within such narrow limits that the strand neck can be removed without cracks. In this type of mold design, there is a strong friction at the transition, which can only be reduced to a limited extent by the lubrication already known. The known mold has the further disadvantage that under Maintaining a small Umforwinkel α, preferably <10 °, the mold must be made the longer, the smaller the thickness of the slab should be.
  • Aufgabe der vorliegenden Erfindung ist es, ein Verfahren und eine Einrichtung zu schaffen, mit denen Stahlbrammen mit Dicken unter 80 mm fehlerfrei und mit hoher Oberflächengüte hergestellt werden können.The object of the present invention is to provide a method and a device with which steel slabs with thicknesses below 80 mm can be produced without defects and with a high surface quality.
  • Diese Aufgabe wird erfindungsgemäß mit den Merkmalen im Kennzeichen des Anspruchs 1 gelöst.This object is achieved with the features in the characterizing part of claim 1.
  • Der Grad der Auswölbung wird erfindungsgemäß so gewählt, daß in Abhängigkeit des Außendurchmessers des benutzten Gießrohres ein Mindestabstand von 20 mm zum Scheitelpunkt der Auswölbung auf der Eingießseite in Höhe des Gießspiegels eingehalten wird. Die Linien des Überganges von der Auswölbung zu dem in der Ebene der Brammenoberfläche liegenden Teil verlaufen konisch. Die Konizität ist in Längserstreckung der Querschnittsvergrößerung des ausgewölbten Bereiches angepaßt und liegt unter einem Wert von 1,2%.The degree of bulging is chosen according to the invention so that, depending on the outside diameter of the pouring tube used, a minimum distance of 20 mm from the apex of the bulging on the pouring side is maintained at the level of the pouring level. The lines of the transition from the bulge to the part lying in the plane of the slab surface are tapered. In the longitudinal direction, the taper is adapted to the cross-sectional enlargement of the bulged area and is below a value of 1.2%.
  • Die der Kokille nachgeordneten Stütz- und Führungsmittel sind erfindungsgemäß dadurch gekennzeichnet, daß mindestens eine Rolle mindestens eines Rollenpaares ein dem austretenden Strang angepaßtes Kaliber aufweist. Die einzelnen Rollen können eine zylindrische oder kegelige bzw. ballige Form haben. Sie sind in einem Führungsgerüst federnd aufgehängt und quer zur Gießachse hydraulisch verstellbar. Damit der kalte Anfahrstrang störungsfrei die Verformungsstrecke passieren kann, wird eine bereits bekannte elektronische Wegsteuerung zur Verstellung der Rollen verwendet.According to the invention, the supporting and guiding means arranged downstream of the mold are characterized in that at least one roller of at least one pair of rollers has a caliber adapted to the emerging strand. The individual rollers can have a cylindrical or conical or spherical shape. They are resiliently suspended in a guide frame and hydraulically adjustable transversely to the casting axis. In order that the cold start-up line can pass the deformation section without problems, an already known electronic path control is used to adjust the rollers.
  • Die erforderliche Verformung des aus der Kokille austretenden Strangformates wird erfindungsgemäß so durchgeführt, daß der zwischen zwei Rollen liegende Abstand eines Rollenpaares von Rollenpaar zu Rollenpaar in Gießrichtung zwischen 0,5 bis 25 mm verringert wird. Diese Bandbreite der Zustellung der Rollen ist erforderlich, damit die werkstoffspezifischen und abmessungsbedingten Erfordernisse im Hinblick auf Rißfreiheit berücksichtigt werden können. Die Angleichung der querschnittsvergrößernden Auswölbung des aus der Kokille austretenden Strangformates an das gewünschte Strangformat wird vorzugsweise auf einer Gesamtlänge von über 1,5 m verteilt, und zwar so, daß erst nach Verlassen der Verformungsstrecke der Strangquerschnitt vollständig durcherstarrt ist, wobei die 1,5 m einer Abstandsverringerung der Rollenpaare von 25 mm zugeordnet sind.The required deformation of the strand format emerging from the mold is carried out according to the invention in such a way that the distance between a pair of rollers lying between two pairs of rollers in the casting direction is reduced between 0.5 and 25 mm. This range of delivery of the rolls is necessary so that the material-specific and dimensional requirements with regard to freedom from cracks can be taken into account. The alignment of the bulge of the strand format emerging from the mold to the desired strand format is preferably distributed over a total length of over 1.5 m, in such a way that the strand cross section is completely solidified only after leaving the deformation zone, the 1.5 m a reduction in the distance of the roller pairs of 25 mm are assigned.
  • Die das Kaliber bildenden Rollen können mit Einzelantrieb versehen sein.The rollers forming the caliber can be provided with an individual drive.
  • In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt.In the drawing, an embodiment of the invention is shown.
  • Es zeigen:
    • Fig. 1 einen Lägnsschnitt durch die Stranggießanlage,
    • Fig. 2 die Draufsicht der Kokille für Brammen mit Dicken unter 80 mm,
    • Fig. 3 einen Schnitt durch die leere Kokille entlang der Linie C-C,
    • Fig. 4, 5, 6 unterschiedliche Ausführungsformen der das Kaliber bildenden Rollen entlang der Linie A-A in Figur 1 im Bereich der Verformungsstrecke
    • Fig. 7 einen Querschnitt durch den Strang entlang der Linie B-B in Figur 1.
    Show it:
    • 1 shows a longitudinal section through the continuous caster,
    • 2 the top view of the mold for slabs with thicknesses below 80 mm,
    • 3 shows a section through the empty mold along the line CC,
    • 4, 5, 6 different embodiments of the rollers forming the caliber along the line AA in FIG. 1 in the region of the deformation path
    • 7 shows a cross section through the strand along the line BB in FIG. 1.
  • Fig. 1 zeigt einen Längsschnitt durch die erfindungsemäße Stranggießanlage zum Stranggießen von Brammen mit erheblich größerer Breite als Dicke, insbesondere von Stahlbrammen mit einer Dicke unter 80 mm, wobei Schmelze aus einem Gießgefäß 1 durch ein Gießrohr 2, welches in den Gießspiegel 4 eintaucht, einer Kokille 3 zugefürht wird. Die Kokille 3, die auf einer Rahmenkonstruktion 5 befestigt ist, kann oszillierend in Gießrichtung bewegt werden, wie durch die Pfeile 6 angedeutet. Das aus der Kokille 3 austretende ausgewölbte Strangformat 7 wird durch die nachgeordneten Stütz- und Führungsmittel 8 erfindungsgemäß so umgeformt, daß die Strangschale 10 im Mittenbereich in der Ebene der Brammenoberfläche des Kantenbereiches 11 liegt. In der Draufsicht der in Fig. 2 dargestellten Kokille 3 bilden erfindungsgemäß der ausgewölbte Quesrchnitt 12, 13 im Mittenbereich und die dem gewünschten Strangformat 11 entsprechenden Schmalseitenwände 14 den eingießseitigen und austrittsseitigen Formraum. Die Pfeile 15, 16 sollen andeuten, daß sowohl die Längsseitenwände 14 als auch die Breitseitenwände 17 verschiebbar sind, so daß das gewünschte Strangaustrittsformat 7 variable enigestellt werden kann. Die Abmessung des benutzten Gießrohres 2 und der querschnittsvergrößernden Auswölbung 12 im Mittenbereich auf der Eingießseite stehen in Beziehung zueinander und zwar erfindungsgemäß so, daß in Höhe des Gießpiegels 4 ein Mindestabstand zwischen Außenumfang 18 des Gießrohres 2 und dem Scheitelpunkt der Auswölbung 19 von 20 mm eingehalten wird.Fig. 1 shows a longitudinal section through the continuous caster according to the invention for the continuous casting of slabs with a considerably greater width than thickness, in particular steel slabs with a thickness of less than 80 mm, with melt from a casting vessel 1 through a pouring tube 2, which is immersed in the casting level 4, one Mold 3 is fed. The mold 3, which is fastened on a frame structure 5, can be moved oscillatingly in the casting direction, as indicated by the arrows 6. The arched strand format 7 emerging from the mold 3 is reshaped according to the invention by the downstream support and guide means 8 such that the strand shell 10 lies in the middle region in the plane of the slab surface of the edge region 11. In the plan view of the mold 3 shown in FIG. 2, according to the invention, the arched-out die cut 12, 13 in the central region and the narrow side walls 14 corresponding to the desired strand format 11 form the mold-side and outlet-side molding space. The arrows 15, 16 are intended to indicate that both the longitudinal side walls 14 and the wide side walls 17 are displaceable, so that the desired strand exit format 7 can be set variably. The dimensions of the pouring tube 2 used and the bulge 12 which increases the cross section in the central region on the pouring side are related to one another, specifically in accordance with the invention in such a way that a minimum distance between the outer periphery 18 of the pouring tube 2 and the apex of the bulge 19 of 20 mm is maintained at the level of the pouring level 4 .
  • Der Längsschnitt durch die Kokille 3 entlang der Linie C-C in Fig. 3 zeigt, daß die Linien 20 des Überganges von der Auswölbung zu dem in der Ebene der Brammenoberfläche liegenden Teil konisch verlaufen, wobei erfindungsgemäß der Wert der Konizität unter 1,2% liegt. Die Längsseitenwände 14 sind ebenfalls konisch eingestellt, wobei durch bereits bekannte Spindeln mit unterschiedlicher Steigungshöhe, die erforderliche Konizität in Abhängigkeit von der Breite des Stranges zusammen mit der Längsverschiebung 15 eingestellt wird. In den Fig. 4, 5 und 6 sind unterschiedliche Ausführungsformen der das Kaliber bildenden Rollenpaare 8 im Bereich der Verformungsstrecke dargestellt. In Fig. 4 wird die Anpassung der Rollen 8 an das austretende ausgewölbte Strangformat 7 dadurch erreicht, daß die zwei ein Rollenpaar bildenden Rollen 22 eine Kaliberform 23 haben. In einer zweiten Ausführungsform in Fig. 5 bilden die zylindrisch geformten Teilrollen 24, 25, 26 annähernd die für die Verformung des Strangquerschnittes erforderliche Kaliberform. Eine dritte Ausführungsform ist in Fig. 6 dargestellt, wobei für die parallel zur Längsebene des Stranges verlaufenden Flächen 27, 28 zylindrische Rollen 29, 30 und für die Übergangsflächen 32 kegelig geformte Rollen 31 verwendet werden. Bei dieser Ausführungsform sind alle die das Kaliber bildenden Rollen 29 bis 31 vorzugsweise auf einer durchgehenden Achse angeordnet. Alle einzelnen Rollen 22 bis 26 und 29 bis 31 in der Verformungsstrecke aller drei genannten Ausführungsformen sind vorzugsweise federnd aufgehänt und hydraulisch verstellbar. Die Angleichung des ausgewölbten Querschnittes 13 im Mittenbereich des austretrenden ausgewölbten Strangformates 7 an das gewünschte Strangformat 11 zeigt Fig. 7. Die Führung des an dieser Stelle durcherstarrten Stranges 11 übernehmen zylindrisch geformte Rollen 9.The longitudinal section through the mold 3 along the line C-C in FIG. 3 shows that the lines 20 of the transition from the bulge to the part lying in the plane of the slab surface are tapered, the taper value according to the invention being below 1.2%. The longitudinal side walls 14 are also set conically, the required conicity depending on the width of the strand being set together with the longitudinal displacement 15 by means of spindles with different pitch heights already known. 4, 5 and 6 different embodiments of the roller pairs 8 forming the caliber are shown in the region of the deformation path. In FIG. 4, the adaptation of the rolls 8 to the emerging arched strand format 7 is achieved in that the two rolls 22 forming a pair of rolls have a caliber shape 23. In a second embodiment in FIG. 5, the cylindrically shaped partial rolls 24, 25, 26 approximately form the caliber shape required for the deformation of the strand cross section. A third embodiment is shown in FIG. 6, cylindrical rollers 29, 30 being used for the surfaces 27, 28 running parallel to the longitudinal plane of the strand and conical rollers 31 being used for the transition surfaces 32. In this embodiment, all the rollers 29 to 31 forming the caliber are preferably arranged on a continuous axis. All individual rollers 22 to 26 and 29 to 31 in the deformation section of all three mentioned embodiments are preferably suspended in a spring-loaded manner and hydraulically adjustable. The alignment of the arched cross-section 13 in the central region of the emerging arched strand format 7 to the desired strand format 11 is shown in FIG. 7. The guidance of the strand 11 which has solidified at this point takes over cylindrically shaped rollers 9.

Claims (2)

1. An apparatus for the continuous casting of flat slabs, in particular steel slabs having a thickness below 80 mm, wherein the molten metal is supplied from a casting container to a mould having on the pouring-in side a cross-section which in the central area deviates in cross-section-widening manner from the desired casting format and corresponds to said format in the edge region, and wherein, maintaining the cross-sectional shape of the pouring-in side of the mould over the entire mould length, the casting shell of the central zone of the casting emerging from the mould is deformed by supporting and guiding means arranged directly after the mould, in such a manner that the shell, after passing through the deforming section, lies in the plane of the slab surface of the edge region, i.e. the bulging casting shell regions are moved relative to each other in such a manner that the bulge disappears,
characterised in that
a cross-section (13) which bulges similarly but is smaller in the central area on the casting exit side of the mould (3) lies opposite the larger bulging cross-section (12) on the pouring-in side, and that the line(s) of the transition (20) from the flat slab surface to the bulging surface has (have) a taper, matched to the longitudinal extent of the cross-section enlargement of the bulging region, of not more than 1.2%,
that the distance between the external circumference (18) of a pouring spout (2) and the vertex of the bulge (19) on the pouring-in side at the level of the casting meniscus (4) is at least 20 mm, that at least one roller of at least one pair (8) of rollers of the supporting and guiding means succeeding the mould has a pass adapted to the emerging bulging casting (7) and that the distance (21) between the rollers of a pair (8) of rollers from roller pair to roller pair in the casting direction is reduced by 0.5 to 25 mm in such a manner that the deformation on the solidification front does not exceed a value of 0.5%.
2. An apparatus according to Claim 1, characterised in that at least one pair (8) of rollers forming the pass is provided with an individual drive.
EP19870905187 1986-08-18 1987-08-17 Device for continuous casting of flat slabs Expired - Lifetime EP0323958B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3627991 1986-08-18
DE19863627991 DE3627991C2 (en) 1986-08-18 1986-08-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT87905187T AT64115T (en) 1986-08-18 1987-08-17 DEVICE FOR CONTINUOUSLY casting flat slabs.

Publications (2)

Publication Number Publication Date
EP0323958A1 EP0323958A1 (en) 1989-07-19
EP0323958B1 true EP0323958B1 (en) 1991-06-05

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ID=6307639

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Application Number Title Priority Date Filing Date
EP19870905187 Expired - Lifetime EP0323958B1 (en) 1986-08-18 1987-08-17 Device for continuous casting of flat slabs

Country Status (6)

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US (1) US4955428A (en)
EP (1) EP0323958B1 (en)
JP (1) JPH02500501A (en)
BR (1) BR8707794A (en)
DE (1) DE3627991C2 (en)
WO (1) WO1988001209A1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP0865849A1 (en) * 1997-03-17 1998-09-23 Sms Schloemann-Siemag Aktiengesellschaft Oscillating mould for continuous casting of slabs
WO1999001244A1 (en) * 1997-06-30 1999-01-14 Sms Demag Ag Method and device for producing thin slabs

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0865849A1 (en) * 1997-03-17 1998-09-23 Sms Schloemann-Siemag Aktiengesellschaft Oscillating mould for continuous casting of slabs
WO1999001244A1 (en) * 1997-06-30 1999-01-14 Sms Demag Ag Method and device for producing thin slabs

Also Published As

Publication number Publication date
BR8707794A (en) 1989-08-15
US4955428A (en) 1990-09-11
EP0323958A1 (en) 1989-07-19
DE3627991C2 (en) 1988-09-29
DE3627991A1 (en) 1988-02-25
WO1988001209A1 (en) 1988-02-25
JPH02500501A (en) 1990-02-22

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