EP0958074B1 - Casting nozzle for thin strip casting plants - Google Patents

Casting nozzle for thin strip casting plants Download PDF

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Publication number
EP0958074B1
EP0958074B1 EP97926986A EP97926986A EP0958074B1 EP 0958074 B1 EP0958074 B1 EP 0958074B1 EP 97926986 A EP97926986 A EP 97926986A EP 97926986 A EP97926986 A EP 97926986A EP 0958074 B1 EP0958074 B1 EP 0958074B1
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EP
European Patent Office
Prior art keywords
casting
nozzle
dam
secondary inductor
thin strip
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
EP97926986A
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German (de)
French (fr)
Other versions
EP0958074A1 (en
Inventor
Klaus Schwerdtfeger
Karl-Heinz Spitzer
Wolfgang Reichelt
Ulrich Urlau
Joachim Kroos
Michael Brühl
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.)
SMS Siemag AG
Original Assignee
SMS Demag 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
Priority claimed from DE19636697A external-priority patent/DE19636697C1/en
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP0958074A1 publication Critical patent/EP0958074A1/en
Application granted granted Critical
Publication of EP0958074B1 publication Critical patent/EP0958074B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt

Definitions

  • the invention relates to a casting nozzle for thin strip casting systems, in particular for casting thin steel strips according to the preamble of claim 1.
  • a nozzle for casting thin steel strips in which the nozzle forms a rear dam, which is adjacent to a movable support and has a front dam, a casting gap between the rear dam and front dam being delimited towards the support.
  • a circumferential steel band serves as the carrier.
  • Such nozzles are usually made of refractory material, which at the high Temperatures of the molten steel are subject to a certain wear, so that during of casting can change the shape of the casting gap, but in any case after a certain one Service life the nozzle must be replaced.
  • the object of the invention was to provide an improved nozzle construction in which the Wear is minimized and the melt is heated in the area of the casting gap can be.
  • At least one primary inductor and at least one secondary inductor are arranged on the nozzle, at least one secondary inductor being water-cooled and projecting into the region of the casting gap.
  • a secondary inductor consists of several, electrical sections isolated from each other. As a result, each section acts as its own Secondary inductor.
  • the formation of the outflow openings is determined by a corresponding Shaping the back dam in the direction of the conveying direction or by a Appropriate shaping of the front dam against the conveying direction is achieved.
  • a secondary inductor in the back dam is off several isolated sections, each with an inlet and outlet for cooling water, taking the individual sections to form.
  • the outflow openings of the melt are dovetail-shaped or arrow-shaped or straight.
  • a flow baffle is provided inside the Sections so that between the inlet and At the end of the sections opposite the casting gap, a positive guide up to the head area of the sections facing the casting gap is reached.
  • the front dam is electric insulated sections of a secondary inductor with inlet and outlet for cooling water arranged, where in the head area of the sections, i.e. where the front dam borders the pouring gap, to form outflow openings, the sections are dovetailed or arrow-shaped or are just trained.
  • FIG. 1 shows a vertical section through a nozzle, in the area of the back dam 2 the secondary inductor 22 from individual sections with a dovetail-shaped end consists. The cut is made through the middle of the dovetail 23.
  • a carrier 1 in particular an endless belt running over rollers, the back dam 2 is fitted.
  • the pouring gap 4 is formed between the back dam 2 and the front dam 3.
  • To the Secondary inductor 22 delimits a primary inductor 21.
  • the liquid steel from the backflow area 5 can be dovetail 23 and front dam 3 into the solidification area 6 by the flow direction indicated by the arrow 7 emanate.
  • a flow guide plate 24 is arranged in section 22.
  • To the Backflow area 5, the secondary inductor 22 is covered by refractory material 25.
  • the inductors 22, 23 are water-cooled, they are preferably made of copper.
  • the Primary inductor 21 is fed with a high frequency.
  • the front dam 3 is electrically powered by one of several Secondary inductors 32 isolated from one another, in which a primary inductor 31 a electrical current induced.
  • Primary inductor 31 and secondary inductor 32 are with water cooled, and the primary inductor 31 is fed with high frequency.
  • the secondary inductor 32 extends beyond the dovetail tip of the secondary inductor 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • General Induction Heating (AREA)
  • Nozzles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

PCT No. PCT/DE97/01151 Sec. 371 Date Dec. 4, 1998 Sec. 102(e) Date Dec. 4, 1998 PCT Filed Jun. 3, 1997 PCT Pub. No. WO97/47412 PCT Pub. Date Dec. 18, 1997A nozzle for thin strip casting plants, especially for steel strip. In casting plants of this type, the liquid steel must be applied on a carrier from the nozzle forming a casting gap. At least one primary coil and a secondary coil are arranged at the nozzle, wherein the secondary coil is water-cooled and projects into the area of the casting gap.

Description

Die Erfindung betrifft eine Gießdüse für Dünnbandgießanlagen,
insbesondere zum Vergießen dünner Stahlbänder nach dem Oberbegriff des Anspruchs 1.The invention relates to a casting nozzle for thin strip casting systems,
in particular for casting thin steel strips according to the preamble of claim 1.

Nach DE 37 07 897 ist eine Düse zum Gießen dünner Stahlbänder bekannt,
bei der die Düse einen Rückdamm bildet, der an einen bewegbaren Träger angrenzt und einen Frontdamm aufweist, wobei zwischen Rückdamm und Frontdamm ein Gießspalt zum Träger hin begrenzt wird. Als Träger dient ein umlaufendes Stahlband.According to DE 37 07 897, a nozzle for casting thin steel strips is known,
in which the nozzle forms a rear dam, which is adjacent to a movable support and has a front dam, a casting gap between the rear dam and front dam being delimited towards the support. A circumferential steel band serves as the carrier.

Derartige Düsen bestehen üblicherweise aus feuerfestem Material, das bei den hohen Temperaturen der Stahlschmelze einem gewissen Verschleiß unterliegt, so daß sich während des Gießens die Form des Gießspaltes ändern kann, jedenfalls aber nach einer gewissen Standzeit die Düse ausgetauscht werden muß.Such nozzles are usually made of refractory material, which at the high Temperatures of the molten steel are subject to a certain wear, so that during of casting can change the shape of the casting gap, but in any case after a certain one Service life the nozzle must be replaced.

Aufgabe der Erfindung war es, eine verbesserte Düsenkonstruktion anzugeben, bei der der Verschleiß minimiert wird und bei der die Schmelze im Bereich des Gießspaltes aufgeheizt werden kann.The object of the invention was to provide an improved nozzle construction in which the Wear is minimized and the melt is heated in the area of the casting gap can be.

Die Lösung dieser Aufgabe bei einer gattungsgemäßen Düse ist in dem kennzeichnenden Merkmal des Patentanspruches 1 angegeben.
Erfindungsgemäß wird an der Düse wenigstens ein Primärinduktor und wenigstens ein Sekundärinduktor angeordnet, wobei wenigstens ein Sekundärinduktor wassergekühlt ist und bis in den Bereich des Gießspaltes hineinragt.The solution to this problem in a generic nozzle is specified in the characterizing feature of claim 1.
According to the invention, at least one primary inductor and at least one secondary inductor are arranged on the nozzle, at least one secondary inductor being water-cooled and projecting into the region of the casting gap.

Durch die Verwendung eines Primärinduktors und eines Sekundärinduktors als separate Bestandteile zur Erzeugung eines elektromagnetischen Feldes, welches bis in den Bereich der Schmelze hineinreicht, kann einerseits erreicht werden, daß die Schmelze im Bereich des Sekundärinduktors nicht bis an die Wandung des Primärinduktors herangelangt, was zu elektrischen Kurzschlüssen führen würde. Andererseits kann durch die in dem Sekundarinduktor induzierten Ströme in der Schmelze selber ein Wirbelstromfeld induziert werden, wodurch eine Aufheizung der Schmelze im Bereich der Ausgießöffnung ermöglicht wird. Hierdurch kann verhindert werden, daß die Ausgießöffnung durch Ansätze erstarrter Schmelze verändert wird. Des weiteren führen die elektromagnetischen Kräfte in der Schmelze zu, einer Verdrängung der Schmelze von dem Sekundärinduktor was ebenfalls hilft, Ansätze zu vermeiden. Das geschilderte Prinzip wird bei der bekannten "cold crucible technique" benutzt, um Metalle in wassergekühlten Tiegeln zu schmelzen.By using a primary inductor and a secondary inductor as separate Components for generating an electromagnetic field, which extends into the range of Reaches melt, it can be achieved on the one hand that the melt in the area of Secondary inductor does not reach the wall of the primary inductor, which is too electrical short circuits. On the other hand, through the in the Secondary inductor induced currents in the melt itself induced an eddy current field be made, which enables heating of the melt in the region of the pouring opening becomes. This can prevent the pouring opening from solidifying due to approaches Melt is changed. Furthermore, the electromagnetic forces in the melt to, displacement of the melt from the secondary inductor which also helps approaches avoid. The principle described is used in the known "cold crucible technique", to melt metals in water-cooled crucibles.

Nach einer bevorzugten Ausführung besteht ein Sekundärinduktor aus mehreren, elektrisch gegeneinander isolierten Abschnitten. Hierdurch wirkt jeder Abschnitt als eigener Sekundärinduktor.According to a preferred embodiment, a secondary inductor consists of several, electrical sections isolated from each other. As a result, each section acts as its own Secondary inductor.

Nach einer weiter bevorzugten Ausführung sind zwischen Rück- und Frontdamm mehrere, in Richtung der Dünnbandbreite nebeneinanderliegende Ausströmöffnungen für die Schmelze ausgebildet.According to a further preferred embodiment, there are several, in Flow openings for the melt lying next to one another in the direction of the thin bandwidth educated.

Hierdurch ergibt sich über die Gießspaltbreite (Dünnbandbreite) eine gleichmäßigere Verteilung der Schmelze. Die Bildung der Ausströmöffnungen wird durch eine entsprechende Formgebung des Rückdammes in Richtung auf die Förderrichtung oder durch eine entsprechende Formgebung des Frontdammes entgegen der Förderrichtung erreicht.This results in a more even distribution across the casting gap width (thin strip width) the melt. The formation of the outflow openings is determined by a corresponding Shaping the back dam in the direction of the conveying direction or by a Appropriate shaping of the front dam against the conveying direction is achieved.

Nach einer weiter bevorzugten Ausführung ist ein Sekundärinduktor im Rückdamm aus mehreren isolierten Abschnitten mit jeweils einem Zu- und Ablauf für Kühlwasser aufgebaut, wobei die einzelnen Abschnitte zur Bildung. der Ausströmöffnungen der Schmelze schwalbenschwanzförmig oder pfeilförmig oder gerade ausgebildet sind. Im Innern der Abschnitte ist insbesondere ein Strömungsleitblech vorgesehen, so daß zwischen Zu- und Ablauf am dem Gießspalt entgegengesetzten Ende der Abschnitte eine Zwangsführung bis in den dem Gießspalt zugewandten Kopfbereich der Abschnitte erreicht wird.According to a further preferred embodiment, a secondary inductor in the back dam is off several isolated sections, each with an inlet and outlet for cooling water, taking the individual sections to form. the outflow openings of the melt are dovetail-shaped or arrow-shaped or straight. Inside the Sections in particular a flow baffle is provided so that between the inlet and At the end of the sections opposite the casting gap, a positive guide up to the head area of the sections facing the casting gap is reached.

Nach einer anderen bevorzugten Ausbildung sind im Bereich des Frontdammes elektrisch isolierte Abschnitte eines Sekundärinduktors mit Zu- und Ablauf für Kühlwasser angeordnet, wobei im Kopfbereich der Abschnitte, also dort, wo der Frontdamm an den Gießspalt grenzt, zur Bildung von Ausströmöffnungen die Abschnitte schwalbenschwanzförmig oder pfeilförmig oder gerade ausgebildet sind.According to another preferred embodiment, the front dam is electric insulated sections of a secondary inductor with inlet and outlet for cooling water arranged, where in the head area of the sections, i.e. where the front dam borders the pouring gap, to form outflow openings, the sections are dovetailed or arrow-shaped or are just trained.

Soweit hier für den Front- oder Rückdamm im Bereich der Ausströmöffnungen von schwalbenschwanz- oder pfeilförmigen Form gesprochen wird, soll hiervon jede andere Formgebung, insbesondere auch halbkreisförmig usw. verstanden werden. Desgleichen soll eingeschlossen sein eine korrespondierende Formgebung von Front- und Rückdamm, z. B. auch kreisrunde Ausströmöffnungen gebildet werden können. Die gegeneinander isolierten Abschnitte im Frontdamm weisen bevorzugt im Innern ebenfalls Strömungsleitbleche zwischen Zu- und Ablauf auf.So far here for the front or back dam in the area of the outflow openings of dovetail or arrow-shaped shape is said to be any other Shaping, especially semicircular, etc. can be understood. The same is said be included a corresponding shape of the front and back dam, z. B. circular outflow openings can also be formed. The isolated from each other Sections in the front dam preferably also have flow baffles in the interior Inlet and outlet on.

Anhand der Abbildungen wird ein Ausführungsbeispiel einer Düse für Dünnbandgießanlagen schematisch dargestellt.An embodiment of a nozzle for Thin strip casting plants shown schematically.

Die Figur 1 zeigt einen vertikalen Schnitt durch eine Düse, wobei im Bereich des Rückdammes 2 der Sekundärinduktor 22 aus einzelnen Abschnitten mit schwalbenschwanzförmigem Ende besteht. Der Schnitt ist durch die Mitte des Schwalbenschwanzes 23 gelegt. Auf einen Träger 1, insbesondere ein über Rollen umlaufendes Endlosband ist der Rückdamm 2 aufgesetzt.FIG. 1 shows a vertical section through a nozzle, in the area of the back dam 2 the secondary inductor 22 from individual sections with a dovetail-shaped end consists. The cut is made through the middle of the dovetail 23. On a carrier 1, in particular an endless belt running over rollers, the back dam 2 is fitted.

Zwischen dem Rückdamm 2 und dem Frontdamm 3 wird der Gießspalt 4 gebildet. An den Sekundärinduktor 22 grenzt ein Primärinduktor 21. In den freien Bereich zwischen Schwalbenschwanz 23 und Frontdamm 3 kann der flüssige Stahl aus dem Rückstaubereich 5 in den Erstarrungsbereich 6 durch die mit dem Pfeil 7 angedeutete Strömungsrichtung ausströmen. In dem Abschnitt 22 ist ein Strömungsleitblech 24 angeordnet. Zum Rückstaubereich 5 hin wird der Sekundärinduktor 22 durch feuerfestes Material 25 abgedeckt. Die Induktoren 22, 23 sind wassergekühlt, sie bestehen bevorzugt aus Kupfer. Der Primärinduktor 21 wird mit einer Hochfrequenz gespeist.The pouring gap 4 is formed between the back dam 2 and the front dam 3. To the Secondary inductor 22 delimits a primary inductor 21. In the free area between The liquid steel from the backflow area 5 can be dovetail 23 and front dam 3 into the solidification area 6 by the flow direction indicated by the arrow 7 emanate. A flow guide plate 24 is arranged in section 22. To the Backflow area 5, the secondary inductor 22 is covered by refractory material 25. The inductors 22, 23 are water-cooled, they are preferably made of copper. The Primary inductor 21 is fed with a high frequency.

In der in Figur 2 gezeigten Version wird der Frontdamm 3 durch einen aus mehreren elektrisch voneinander isolierten Sekundärinduktoren 32 gebildet, in denen ein Primärinduktor 31 einen elektrischen Strom induziert. Primärinduktor 31 und Sekundärinduktor 32 werden mit Wasser gekühlt, und der Primärinduktor 31 wird mit Hochfrequenz gespeist. Der Sekundarinduktor 32 reicht bis über die Schwalbenschwanzspitze des Sekundarinduktors 22.In the version shown in FIG. 2, the front dam 3 is electrically powered by one of several Secondary inductors 32 isolated from one another, in which a primary inductor 31 a electrical current induced. Primary inductor 31 and secondary inductor 32 are with water cooled, and the primary inductor 31 is fed with high frequency. The secondary inductor 32 extends beyond the dovetail tip of the secondary inductor 22.

Claims (5)

  1. A casting nozzle for thin strip casting plants having a rear dam, which rests on a thin strip support movable in the conveying direction, and a front dam, which defines the casting slot relative to the support in the conveying direction, characterised in that
    at least one primary inductor (21, 31) and at least one secondary inductor (22, 32) are provided, at least one secondary inductor (22, 32) being water-cooled and projecting as far as into the area of the casting slot (4).
  2. A nozzle according to claim 1, characterised in that a secondary inductor (22, 32) consists of a plurality of portions insulated electrically from each other.
  3. A nozzle according to claim 1 or claim 2, characterised in that a plurality of outflow openings are constructed adjacent one another in the direction of the thin strip width between the rear dam (2) and the front dam (3).
  4. A nozzle according to claim 3, characterised in that a secondary inductor (22) in the rear dam (2) consists of electrically insulated portions with inlet and outlet for cooling water and the portions are dovetail- or arrow-shaped or straight to form the outflow openings.
  5. A nozzle according to claim 3, characterised in that a secondary inductor (32) in the front dam (3) consists of electrically insulated portions with inlet and outlet for cooling water and the portions are dovetail- or arrow-shaped or straight to form the outflow openings.
EP97926986A 1996-06-07 1997-06-03 Casting nozzle for thin strip casting plants Expired - Lifetime EP0958074B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19622924 1996-06-07
DE19622924 1996-06-07
DE19636697 1996-09-10
DE19636697A DE19636697C1 (en) 1996-06-07 1996-09-10 Casting nozzle used in plant for continuous casting of thin steel bands
PCT/DE1997/001151 WO1997047412A1 (en) 1996-06-07 1997-06-03 Casting nozzle for thin strip casting plants

Publications (2)

Publication Number Publication Date
EP0958074A1 EP0958074A1 (en) 1999-11-24
EP0958074B1 true EP0958074B1 (en) 2001-08-29

Family

ID=26026408

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Application Number Title Priority Date Filing Date
EP97926986A Expired - Lifetime EP0958074B1 (en) 1996-06-07 1997-06-03 Casting nozzle for thin strip casting plants

Country Status (12)

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US (1) US6112954A (en)
EP (1) EP0958074B1 (en)
JP (1) JP3132832B2 (en)
CN (1) CN1072054C (en)
AT (1) ATE204794T1 (en)
AU (1) AU715986B2 (en)
BR (1) BR9709772A (en)
DK (1) DK0958074T3 (en)
ES (1) ES2159869T3 (en)
RU (1) RU2153950C1 (en)
TR (1) TR199802192T2 (en)
WO (1) WO1997047412A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100388993C (en) * 2005-07-18 2008-05-21 刘国权 Method of regulating molten steel overheat and water cooling sprue gate device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838814A (en) * 1956-01-19 1958-06-17 Joseph B Brennan Method and apparatus for casting
DE3342302A1 (en) * 1983-11-23 1985-05-30 Wickmann-Werke GmbH, 5810 Witten METHOD FOR THE PRODUCTION OF A SMALL FUSE AND A SMALL FUSE
US4808618A (en) * 1986-04-16 1989-02-28 Nippon Zoki Pharmaceutical Co., Ltd. Substituted 1,3-dialkylpyrido[4,3-d]pyrimidine-2,4-diones
DE3761951D1 (en) * 1986-04-30 1990-04-26 Larex Ag MULTI-PIECE CASTING NOZZLE FOR INLETING METAL MELT INTO THE CASTING SPACE OF A CONTINUOUS CASTING MACHINE.
DE3707897A1 (en) * 1987-03-12 1988-09-22 Mannesmann Ag METHOD AND CASTING DEVICE FOR CASTING METAL STRIPS, ESPECIALLY STEEL
DE3842690C2 (en) * 1988-12-19 1998-04-30 Didier Werke Ag Refractory connection and induction coil therefor
DE4301330C2 (en) * 1993-01-20 1997-02-13 Didier Werke Ag Process by inductive heating for tempering and / or firing a refractory shaped body made of ceramic material
US5439047A (en) * 1994-02-07 1995-08-08 Eckert; C. Edward Heated nozzle for continuous caster
US5799720A (en) * 1996-08-27 1998-09-01 Ajax Magnethermic Corp. Nozzle assembly for continuous caster

Also Published As

Publication number Publication date
JP2000512554A (en) 2000-09-26
US6112954A (en) 2000-09-05
ATE204794T1 (en) 2001-09-15
EP0958074A1 (en) 1999-11-24
JP3132832B2 (en) 2001-02-05
AU3164597A (en) 1998-01-07
CN1072054C (en) 2001-10-03
BR9709772A (en) 2000-01-25
WO1997047412A1 (en) 1997-12-18
ES2159869T3 (en) 2001-10-16
TR199802192T2 (en) 1999-02-22
RU2153950C1 (en) 2000-08-10
AU715986B2 (en) 2000-02-10
DK0958074T3 (en) 2001-10-08
CN1221362A (en) 1999-06-30

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