EP0323958A1 - Device for continuous casting of flat slabs. - Google Patents

Device for continuous casting of flat slabs.

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Publication number
EP0323958A1
EP0323958A1 EP87905187A EP87905187A EP0323958A1 EP 0323958 A1 EP0323958 A1 EP 0323958A1 EP 87905187 A EP87905187 A EP 87905187A EP 87905187 A EP87905187 A EP 87905187A EP 0323958 A1 EP0323958 A1 EP 0323958A1
Authority
EP
European Patent Office
Prior art keywords
mold
rollers
casting
pair
cross
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
EP87905187A
Other languages
German (de)
French (fr)
Other versions
EP0323958B1 (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
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT87905187T priority Critical patent/ATE64115T1/en
Publication of EP0323958A1 publication Critical patent/EP0323958A1/en
Application granted granted Critical
Publication of EP0323958B1 publication Critical patent/EP0323958B1/en
Anticipated expiration legal-status 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
    • B22D11/12—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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • the present invention relates to a method and a device for the continuous casting of slabs with a considerably greater width than thickness, the melt being fed from a casting vessel to a mold, the cross section of the pouring side of which deviates from the desired strand format in the central region and corresponds to this in the edge region.
  • Strand shell can be conveyed without cracks.
  • this type of mold design there is a strong friction at the transition, which is only slight due to the already known lubrication
  • the known mold has the further disadvantage that, while maintaining a small forming angle o
  • 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.
  • Mold length the specifications for the casting and cooling speed can be selected in a wide range without restricting the area of application with regard to slabs with very small thicknesses.
  • the invention also relates to a mold, as well as downstream support and guide means.
  • the water-cooled mold has slidable wide and long side walls, so that the desired strand exit format can be set variably.
  • the mold can be designed in a straight or curved shape and the cross-section-increasing pouring and discharge side in the central area on one side or symmetrically on both sides.
  • the mold which is attached to a frame construction, is moved oscillating in the casting direction.
  • the boundary lines of the cross-section deviating from the desired strand format in the middle region on the pouring-in and exit-side of the mold can be curved or straight.
  • the degree of curvature is chosen according to the invention such that, depending on the outside diameter of the pouring tube used, a minimum distance of 20 mm from the apex of the bulge on the pouring side at the level of the pouring level is maintained.
  • the lines of the transition from the bulge to the part lying in the plane of the slab surface run conically.
  • the taper is adapted to the cross-sectional enlargement of the bulged area and is below a value of 1.2%.
  • the supporting and guiding means arranged downstream of the mold are characterized according to the invention 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 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.
  • 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 from one pair of rollers to the other in the casting direction is reduced between 0.5 and 5 mm. This range of delivery of the roles is necessary for the
  • 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 / f. 5 m, in such a way that the strand cross section is completely solidified only after leaving the deformation zone. whereby, the 1.5 m are assigned a reduction in the distance of the roller pairs of 25 mm.
  • the rollers forming the caliber can be provided with an individual drive.
  • FIG. 1 shows a longitudinal section through the continuous casting installation 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, the melt from a pouring vessel 1 through a pouring tube 2, which is immersed in the casting level 4 , a mold 3 is fed.
  • the Koj ⁇ lle 3, which is attached to a frame structure 5, can be moved oscillating in the casting direction, as indicated by the arrows 6.
  • the strand format 7 emerging from the mold 3 is reshaped according to the invention by the downstream supporting and guiding means 8 in such a way that the strand shell 10 lies in the middle region in the plane of the slab surface of the edge region 11.
  • the downstream supporting and guiding means 8 in such a way that the strand shell 10 lies in the middle region in the plane of the slab surface of the edge region 11.
  • the arched cross-section 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 broad 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 according to the invention in such a way that at the level of the pouring level 4 there is a minimum distance between the outer circumference 18 of the pouring tube 2 and the apex of the bulge 19 of 20 mm is observed.
  • the longitudinal section through the mold 3 along the line CC 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 adjusted together with the longitudinal displacement 15 by means of spindles with different pitch heights already known.
  • 4, 5 and 6 show different embodiments of the pairs of rollers 8 forming the caliber in the region of the deformation path. 4, the adaptation of the rolls 8 to the emerging strand format 7 is achieved in that the two rolls 22 forming a pair of rolls have a caliber shape 23.
  • FIG. 6 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.
  • all the rollers 29 to 31 forming the caliber are preferably arranged on a continuous axis.
  • All of the individual rollers 22 to 26 and 29 to 31 in the deformation section of all three of the above-mentioned embodiments are preferably resiliently suspended and hydraulically adjustable.
  • the alignment of the arched cross-section 13 in the central region of the emerging strand format 7 to the desired strand format 11 is shown in FIG. 7.
  • the guide of the strand 11, which is rigid at this point, is performed by cylindrical-shaped rollers 9.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Un procédé sert à couler en continu des brames ayant une largeur considérablement supérieur à leur épaisseur, en particulier des brames d'acier de moins de 80 mm d'épaisseur. La masse fondue est versée d'un récipient de coulée (1) dans une lingotière (3) ayant du côté d'introduction de la coulée une section centrale plus grande au milieu que le format voulu de la coulée et correspondant à celui-ci dans ses zones marginales. Afin d'obtenir un procédé et un dispositif qui permettent de produire des brames en acier sans défauts de moins de 80 mm d'épaisseur et avec une finition de surface de haute qualité, la forme de la section transversale du côté d'introduction de la coulée dans la lingotière est maintenue sur toute la longueur de celle-ci et la croûte solidifiée de la zone centrale de la coulée (7) qui sort de la lingotière est déformée par des éléments de support et de guidage (8) agencés immédiatement après la lingotière, de sorte qu'après avoir traversé la section de déformation, la croûte solidifiée se situe sur le plan des bords (11) de la surface de la brame.A process is used to continuously cast slabs having a width considerably greater than their thickness, in particular steel slabs less than 80 mm thick. The melt is poured from a casting container (1) into an ingot mold (3) having on the casting introduction side a central section larger in the middle than the desired format of the casting and corresponding to this in its marginal areas. In order to obtain a method and a device which makes it possible to produce steel slabs without defects less than 80 mm thick and with a high quality surface finish, the shape of the cross section of the introduction side of the casting in the ingot mold is maintained over its entire length and the solidified crust of the central zone of the casting (7) which exits the ingot mold is deformed by support and guide elements (8) arranged immediately after the casting. ingot mold, so that after passing through the deformation section, the solidified crust is located on the plane of the edges (11) of the surface of the slab.

Description

Verfahren zum Stranggießen von Brammen und Einrichtung zur Durchfüh¬ rung des Verfahrens. Process for the continuous casting of slabs and device for carrying out the process.
Die vorliegende Erfindung betrifft ein Verfahren und eine Einrichtung zum Stranggießen von Brammen mit erheblich größerer Breite als Dicke, wobei Schmelze aus einem Gießgefäß einer Kokille zugeführt wird, deren eingießseitiger Querschnitt im Mittenbereich vom gewünschten Strangformat abweicht und im Kantenbereich diesem entspricht.The present invention relates to a method and a device for the continuous casting of slabs with a considerably greater width than thickness, the melt being fed from a casting vessel to a mold, the cross section of the pouring side of which deviates from the desired strand format in the central region and corresponds to this in the edge region.
Diese bekannte Kokille (DE 3400220 AI) hat den Nachteil, daß amThis known mold (DE 3400220 AI) has the disadvantage that on
Übergang vom querschnittsvergrößernden Eingießbereich zum gewünschten Strangformat innerhalb der Kokille starke Biegebeanspruchungen der Strangschale auftreten. Zur Verringerung der Biegebeanspruchung muß zum einen der Umformwinkel o klein gehalten und zum. anderen Gieß- und AbkUhigeschwindigkeit in so engen Grenzen gewählt werden, daß dieTransition from the cross-section-increasing pouring area to the desired strand format within the mold, strong bending stresses of the strand shell occur. To reduce the bending stress, the forming angle o must be kept small and other casting and cooling speed can be chosen within such narrow limits that the
Strangschale ohne Anrisse ausgefördert werden kann. Bei dieser Art der Ausbildung der Kokille tritt am Übergang eine starke Reibung auf, die auch durch die bereits bekannte Schmierung nur in einem geringenStrand shell can be conveyed without cracks. In this type of mold design, there is a strong friction at the transition, which is only slight due to the already known lubrication
Umfang verringert v/erden kann. Die bekannte Kokille hat noch den weiteren Nachteil, daß unter Beibehaltung eines kleinen Umformwinkels oCircumference can be reduced. The known mold has the further disadvantage that, while maintaining a small forming angle o
& , vorzugsweise <T 10 , die Kokille um so länger gemacht werden muß, je geringer die Dicke der Bramme sein soll.&, preferably <T 10, the longer the thickness of the slab should be, the longer the mold has to be made.
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 im Rahmen des erfindungsgemäßen Verfahrens dadurch gelöst, daß unter Beibehaltung der Querschnittsform der Eingießseite der Kokille über die gesamte Kokillenlänge die Strangschale des Mittenbereiches des aus der Kokille austretenden Stranges durch der Kokille nachgeordnete Stütz- und Führungsmittel derart verformt wird, daß sie in der Ebene der Brammenoberfläche des Seitenbereiches liegt. Gemäß dieser Verfahrensweise wird die erstarrende Strangschale im Kokillenbereich keiner kritischen Verformung unterworfen und die Angleichung des austretenden Strangformates an das gewünschte Format im Bereich der nachgeordneten Stütz- und Führungsmittel vorgenom- en. Dies hat den Vorteil, daß die notwendige Verfor¬ mung der vom gewünschten Format abweichenden Auswölbung im Mitten¬ bereich:über eine im Vergleich zu der Kokillenab essung erheblich größere Länge, vorzugsweise mindestens 1,5 m, verteilt wird und dadurch kritische Innenrisse sicher vermieden werden. Ein weiterer Vorteil ergibt sich erfindungsgemäß dadurch, daß bei unveränderterThis object is achieved within the scope of the method according to the invention in that while maintaining the cross-sectional shape of the pouring side of the mold over the entire mold length, the strand shell of the central region of the strand emerging from the mold is deformed by support and guide means arranged downstream of the mold in such a way that it Level of the slab surface of the side area. According to this procedure, the solidifying strand shell in the mold area is not subjected to any critical deformation and the emerging strand format is adapted to the desired format in the area of the downstream support and guide means. This has the advantage that the necessary deformation of the bulge deviating from the desired format in the middle region is distributed over a length which is considerably longer than that of the mold, preferably at least 1.5 m, and critical internal cracks are thereby reliably avoided . Another advantage according to the invention results from the fact that with unchanged
Kokillenlänge die Vorgaben für die Gieß- und Abkühlgeschwindigkeit in einer großen Bandbreite gewählt werden können, ohne den Anwendungs¬ bereich im Hinblick auf Brammen mit sehr geringen Dicken einzu¬ schränken. j Mold length, the specifications for the casting and cooling speed can be selected in a wide range without restricting the area of application with regard to slabs with very small thicknesses. j
Die Erfindung betrifft auch eine Kokille, sowie nachgeordnete Stütz- und Führungsmittel. Die wassergekühlte Kokille hat verschiebbare Breit- und Längsseitenwände, so daß das gewünschte Strangaustritts¬ format variabel eingestellt werden kann. Die Kokille kann in gerader oder in gebogener Form und die querschnittsvergrößernde Eingieß- sowie Austrittseite im Mittenbereich einseitig oder symmetrisch beidseitig ausgeführt werden. Die Kokille, die auf einer Rahmen¬ konstruktion befestigt ist, wird oszillierend in Gießrichtung bewegt. Die Begreπzungslinien des vom gewünschten Strangformat abweichenden Querschnittes im Mittenbereich auf der Eingieß- sowie Austrittsseite der Kokille können gebogen oder gerade sein.The invention also relates to a mold, as well as downstream support and guide means. The water-cooled mold has slidable wide and long side walls, so that the desired strand exit format can be set variably. The mold can be designed in a straight or curved shape and the cross-section-increasing pouring and discharge side in the central area on one side or symmetrically on both sides. The mold, which is attached to a frame construction, is moved oscillating in the casting direction. The boundary lines of the cross-section deviating from the desired strand format in the middle region on the pouring-in and exit-side of the mold can be curved or straight.
Der Grad der Auswölbung wird erfindungsgemäß so gewählt, daß in Ab¬ hängigkeit des Außendurchmessers des benutzten Gießrohres ein Min- destabstand von 20 mm zum Scheitelpunkt der Αuswölbung auf der Ein¬ gießseite in Höhe des Gießspiegels eingehalten wird. Die Linien des Überganges von der Auswölbung zu dem in der Ebene der Brammenober¬ fläche liegenden Teil verlaufen konisch. Die Konizität ist in Längs¬ erstreckung der Querschnittsvergrößerung des ausgewölbten Bereiches angepaßt und liegt unter einem Wert von 1,2 %, Die der Kokille nachgeordneten Stütz- und Führungsmittel sind erfin¬ dungsgemäß dadurch gekennzeichnet, daß mindestens eine Rolle min¬ destens 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.The degree of curvature is chosen according to the invention such that, depending on the outside diameter of the pouring tube used, a minimum distance of 20 mm from the apex of the bulge on the pouring side at the level of the pouring level is maintained. The lines of the transition from the bulge to the part lying in the plane of the slab surface run conically. 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%. The supporting and guiding means arranged downstream of the mold are characterized according to the invention 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 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 Strang¬ formates wird erfindungsgemäß so durchgeführt, daß der zwischen zwei Rollen liegende Abstand eines Rollenpaares von Rollenpaar zu Rollen- paar in Gießrichtung zwischen 0,5 bis 5 mm verringert wird. Diese Bandbreite der Zustellung der Rollen ist erforderlich, damit dieThe 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 from one pair of rollers to the other in the casting direction is reduced between 0.5 and 5 mm. This range of delivery of the roles is necessary for the
• werkstoffspezifischen und abmessungsbedingten Erfordernisse im Hin¬ blick auf Rißfreiheit berücksichtigt werden können. Die Angleichung der querschnittsvergrößernden Auswölbung des aus der Kokille austre¬ tenden Strangformates an das gewünschte Strangformat wird vorzugs- weise auf einer Gesamtlänge von/f,5 m verteilt, und zwar so, daß erst nach Verlassen der Verformungsstrecke der Strangquerschnitt voll¬ ständig durcherstarrt ist, wobei, die 1,5 m einer Abstandsverringerung der Rollenpaare von 25 mm zugeordnet sind. Die das Kaliber bildenden Rollen können mit Einzelantrieb versehen sein.• Material-specific and dimensional requirements can be taken into account with regard to freedom from cracks. 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 / f. 5 m, in such a way that the strand cross section is completely solidified only after leaving the deformation zone. whereby, the 1.5 m are assigned a reduction in the distance of the roller pairs of 25 mm. 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:Show it:
/ über Fig. 1 einen Längsschnitt durch die Stranggfeßanlage,/ about 1 shows a longitudinal section through the continuous casting plant,
Fig. 2 die Draufsicht der Kokille für Braπmen mit Dicken unter 80 mm,2 shows the top view of the mold for brains with thicknesses below 80 mm,
Fig. 3 einen Schnitt durch die leere Kokille entlang der Linie C-C,3 shows a section through the empty mold along the line 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 1.4, 5, 6 different embodiments of the rolls forming the caliber along the line A-A in FIG. 1 in the region of the deformation section FIG. 7 a cross section through the strand along the line B-B in FIG. 1.
Fig. 1 zeigt einen Längsschnitt durch die erfindungsgemäße Strang¬ gießanlage 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 zugeführt wird. Die Kojπlle 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 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 Kanteπbereiches 11 liegt. In der Draufsicht der in Fig. 2 dargestellten Kokille 3 bilden erfindungsgemäß der aus¬ gewölbte Querschnitt 12, 13 im Mittenbereich und die dem gewünschten Strangformat 11 entsprechenden Schmalseitenwände 14 den eingießsei- tigen und austrittsseitigen Formraum. Die Pfeile 15, 16 sollen an¬ deuten, daß sowohl die Längsseitenwände 14 als auch die Breitseiten¬ wände 17 verschiebbar sind, so daß das gewünschte Strangaustritts¬ format 7 variabel eingestellt werden kann. Die Abmessung des benutz- ten Gießrohres 2 und der querschnittsvergrößernden Auswölbung 12 im Mittenbereich auf der Eingießseite stehen in Beziehung zueinander und zwar erfindungsgemäß so, daß in Höhe des Gießspiegels 4 ein Mindest¬ abstand zwischen Außenumfang 18 des Gießröhres 2 und dem Scheitel¬ punkt der Auswölbung 19 von 20 mm eingehalten wird. 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 Kali- ber bildenden Rollenpaare 8 im Bereich der Verformungsstrecke darge¬ stellt. In Fig. 4 wird die Anpassung der Rollen 8 an das austretende Strangformat 7 dadurch erreicht, daß die zwei ein Rollenpaar bilden¬ den Rollen 22 eine Kaliberform 23 haben. In einer zweiten Ausfüh¬ rungsform in Fig. 5 bilden die zylindrisch geformten Teilrollen 24, 25, 26 annähernd die für die Verformung des Strangquerschnittes er¬ forderliche Kaliberform. Eine dritte Ausführungsform ist in Fig. 6 dargestellt, wobei für die parallel zur Längsebene des Stranges ver¬ laufenden 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 aufgehängt und hydraulisch verstellbar. Die Angleichung des ausge- wölbten Querschnittes 13 im Mittenbereich des austretenden Strang¬ formates 7 an das gewünschte Strangformat 11 zeigt Fig. 7. Die Füh¬ rung des an dieser Stelle durcherstarrten Stranges 11 übernehmen zyl ndrisch geformte Rollen 9. 1 shows a longitudinal section through the continuous casting installation 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, the melt from a pouring vessel 1 through a pouring tube 2, which is immersed in the casting level 4 , a mold 3 is fed. The Kojπlle 3, which is attached to a frame structure 5, can be moved oscillating in the casting direction, as indicated by the arrows 6. The strand format 7 emerging from the mold 3 is reshaped according to the invention by the downstream supporting and guiding means 8 in such a way that the strand shell 10 lies in the middle region in the plane of the slab surface of the edge region 11. In the top view of the mold 3 shown in FIG. 2, according to the invention, the arched cross-section 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 broad 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 according to the invention in such a way that at the level of the pouring level 4 there is a minimum distance between the outer circumference 18 of the pouring tube 2 and the apex of the bulge 19 of 20 mm is observed. The longitudinal section through the mold 3 along the line CC 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 adjusted together with the longitudinal displacement 15 by means of spindles with different pitch heights already known. 4, 5 and 6 show different embodiments of the pairs of rollers 8 forming the caliber in the region of the deformation path. 4, the adaptation of the rolls 8 to the emerging 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 of the individual rollers 22 to 26 and 29 to 31 in the deformation section of all three of the above-mentioned embodiments are preferably resiliently suspended and hydraulically adjustable. The alignment of the arched cross-section 13 in the central region of the emerging strand format 7 to the desired strand format 11 is shown in FIG. 7. The guide of the strand 11, which is rigid at this point, is performed by cylindrical-shaped rollers 9.

Claims

Patentansprüche Claims
1. Verfahren zum Stranggießen von Brammen mit erheblich größerer Breite als Dicke, insbesondere von Stahlbrammen mit einer Dicke unter 80 mm, wobei Schmelze aus einem Gießgefäß einer Kokille zugeführt wird, deren eingießseitiger Querschnitt im Mittenbe- reich vom gewünschten Strangformat querschnittsvergrößernd ab¬ weicht und im Kantenbereich diesem entspricht, dadurch gekennzeichnet, daß unter Beibehaltung der Querschnittsform der Eingießseite der Kokille über die gesamte Kokillenlänge die Strangschale des Mittenbereiches des aus der Kokille austretenden Stranges durch unmittelbar der Kokille nachgeordnete Stütz- und Führuπgsmittel derart verformt wird, daß sie nach dem Durchgang durch die Verformungsstrecke in der Ebene der Brammenoberfläche des Kantenbereiches liegt.1. Process 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, melt being fed from a casting vessel to a mold whose cross-section on the pouring side deviates in the central region from the desired strand format and increases the cross section Edge area corresponds to this, characterized in that while maintaining the cross-sectional shape of the pouring side of the mold over the entire length of the mold, the strand shell of the central region of the strand emerging from the mold is deformed by support and guiding means immediately downstream of the mold in such a way that it passes through the mold Deformation distance lies in the plane of the slab surface of the edge area.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Verformung durch mindestens ein kaliberbildendes Rollen¬ paar erfolgt. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, * daß die Deformation an der Erstarrungsfront'einen Wert von 0,5 nicht übersteigt.2. The method according to claim 1, characterized in that the deformation takes place by at least one caliber-forming roller pair. 3. The method according to claims 1 and 2, characterized in that * the deformation on the solidification front 'does not exceed a value of 0.5.
4. Einrichtung zur Durchführung des Verfahrens nach Anspruch 1, bestehend, aus Gießgefäß, Kokille, deren eingießseitiger Quer¬ schnitt im Mittenbereich vo gewünschten Strangformat abweicht und im Kantenbereich diesem entspricht, sowie Stütz- und Füh- . rungsmittel, dadurch gekennzeichnet, daß ein im Mittenbereich kleinerer gleichartig ausgewölbter Querschnitt (13) auf der Strangaustrittsseite der Kokille (3) dem größeren ausgewölbten Querschnitt (12) auf der Eingießseite gegenübersteht.4. Device for carrying out the method according to claim 1, consisting of a casting vessel, mold, the cross-section of the pouring side of which deviates from the desired strand format in the central region and corresponds to this in the edge region, as well as supporting and guiding. means, characterized in that a smaller, similarly arched cross-section (13) on the strand exit side of the mold (3) faces the larger, curved cross-section (12) on the pouring side.
5. Kokille nach Anspruch 4, dadurch gekennzeichnet, daß die Linie(n) des Überganges (20) von der ebenen Brammenober- fläche zur ausgewölbten Oberfläche eine der Längserstreckung der Querschnittsvergrößerung des ausgewölbten Bereiches angepaßten Konizität von nicht mehr als 1,2 % aufweist (aufweisen).5. Chill mold according to claim 4, characterized in that the line (s) of the transition (20) from the flat slab surface to the curved surface has a taper adapted to the longitudinal extent of the cross-sectional enlargement of the curved region of not more than 1.2% ( exhibit).
6. Kokille nach Anspruch 4, dadurch gekennzeichnet, daß der Abstand zwischen dem Außenumfang (18) des benutzten Gießrohres (2) und dem Scheitelpunkt der Auswölbung (19) auf der Eingießseite in Höhe des Gießspiegeis (4) mindestens 20 mm be¬ trägt.6. Chill mold according to claim 4, characterized in that the distance between the outer circumference (18) of the pouring tube used (2) and the apex of the bulge (19) on the pouring side at the level of the pouring mirror (4) is at least 20 mm.
««
* / von Rollenpaar zu Rollenpaar 7. Vorrichtung nach den Ansprüchen 1 und 4, wobei der Kokille Stütz- und Führungsmittel nachgeordnet sind, dadurch gekennzeichnet, daß mindestens eine Rolle mindestens eines Rollenpaares (8) ein 5 dem austretenden Strang (7) angepaßtes Kaliber aufweist.* / from pair of rollers to pair of rollers 7. Device according to claims 1 and 4, wherein the mold support and guide means are arranged downstream, characterized in that at least one roller of at least one pair of rollers (8) has a 5 caliber adapted to the emerging strand (7).
82., Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß der Abstand (21) zwischen den Rollen eines Rollenpaares (8) 10 von Rollenpaar zu Rollenpaar in Gießrichtung um 0,5 -25 mm ver¬ ringert ist.82., Device according to claim 7, characterized in that the distance (21) between the rollers of a pair of rollers (8) 10 is reduced from pair of rollers to pair of rollers in the casting direction by 0.5-25 mm.
9. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, 15 daß mindestens ein das Kaliber bildende Rollenpaar (8) mit Einzelantrieb versehen ist.9. The device according to claim 7, characterized in 15 that at least one pair of rollers forming the caliber (8) is provided with an individual drive.
2020th
2525
30. 30th
EP87905187A 1986-08-18 1987-08-17 Device for continuous casting of flat slabs Expired - Lifetime EP0323958B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87905187T ATE64115T1 (en) 1986-08-18 1987-08-17 EQUIPMENT FOR CONTINUOUS CASTING OF FLAT SLABS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863627991 DE3627991A1 (en) 1986-08-18 1986-08-18 METHOD FOR CONTINUOUSLY MOLDING SLABS AND DEVICE FOR CARRYING OUT THE METHOD
DE3627991 1986-08-18

Publications (2)

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

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87905187A Expired - Lifetime EP0323958B1 (en) 1986-08-18 1987-08-17 Device for continuous casting of flat slabs

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Country Link
US (1) US4955428A (en)
EP (1) EP0323958B1 (en)
JP (1) JPH02500501A (en)
BR (1) BR8707794A (en)
DE (1) DE3627991A1 (en)
WO (1) WO1988001209A1 (en)

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Also Published As

Publication number Publication date
WO1988001209A1 (en) 1988-02-25
JPH02500501A (en) 1990-02-22
DE3627991A1 (en) 1988-02-25
DE3627991C2 (en) 1988-09-29
EP0323958B1 (en) 1991-06-05
BR8707794A (en) 1989-08-15
US4955428A (en) 1990-09-11

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