EP0958074A1 - Casting nozzle for thin strip casting plants - Google Patents

Casting nozzle for thin strip casting plants

Info

Publication number
EP0958074A1
EP0958074A1 EP97926986A EP97926986A EP0958074A1 EP 0958074 A1 EP0958074 A1 EP 0958074A1 EP 97926986 A EP97926986 A EP 97926986A EP 97926986 A EP97926986 A EP 97926986A EP 0958074 A1 EP0958074 A1 EP 0958074A1
Authority
EP
European Patent Office
Prior art keywords
casting
dam
nozzle
sections
nozzle according
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
EP97926986A
Other languages
German (de)
French (fr)
Other versions
EP0958074B1 (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
Salzgitter AG
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
Priority claimed from DE19636697A external-priority patent/DE19636697C1/en
Application filed by Salzgitter AG, Mannesmann AG filed Critical Salzgitter AG
Publication of EP0958074A1 publication Critical patent/EP0958074A1/en
Application granted granted Critical
Publication of EP0958074B1 publication Critical patent/EP0958074B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
  • a nozzle for casting thin steel strips in which the nozzle forms a jerk dam, which is adjacent to a movable support and a front dam, a casting gap between the ruck dam and the front dam being delimited towards the support
  • Such nozzles usually consist of refractory material, which is subject to a certain amount of wear at the high temperatures of the molten steel, so that the shape of the casting gap can change during the casting, but in any case the nozzle must be replaced after a certain service life
  • the object of the invention was to provide an improved nozzle design in which wear is minimized and in which the melt can be heated in the region of the casting gap
  • a secondary inductor is arranged, at least one secondary inductor being water-cooled and projecting into the area of the casting gap
  • a secondary inductor consists of several sections which are electrically insulated from one another. As a result, each section acts as a separate secondary inductor
  • a plurality of outflow openings for the melt which are adjacent to one another in the direction of the thin bandwidth, are formed between the back and front dams
  • a secondary inductor in the Ruckdamm is constructed from a plurality of isolated sections, each with an inlet and outlet for cooling water, the individual sections being dovetailed or arrow-shaped or straight to form the outflow openings of the melt.
  • a flow baffle is inside the sections provided that between the inlet and outlet at the end of the sections opposite the casting gap, a forced guidance is achieved up to the head region of the sections facing the casting gap
  • electrically insulated sections of a secondary duct with inlet and outlet for cooling water are arranged in the area of the front dam, the sections being dovetailed or arrow-shaped in the head region of the sections, i.e. where the front dam borders the pouring gap, to form outflow openings or are just trained
  • a corresponding shape of the front and rear dam should be included, for example circular discharge openings can also be formed.
  • the mutually insulated sections in the front dam preferably also have flow baffles between the inlet and outlet inside
  • a carrier 1 in particular an endless belt running over rollers, is the one Ruckdamm 2 put on
  • the pouring gap 4 is formed between the jerk dam 2 and the front dam 3.
  • a secondary inductor 21 borders on the secondary duct 22 Flowing out current flow In section 22, a flow baffle 24 is arranged.
  • the secondary inductor 22 is covered by refractory material 25 to the backflow area 5 hm.
  • the inductors 22, 23 are water-cooled, they are preferably made of copper
  • the front dam 3 is formed by one of a plurality of electrically isolated secondary inductors 32, in which a magnetic inductor 31 induces an electric current.
  • the magnetic inductor 31 and secondary inductor 32 are cooled with water, and the magnetic inductor 31 is fed with high frequency Secondary inductor 32 extends beyond the dovetail tip of 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

Gießduse für Dünnbandgießanlagen Casting nozzle for thin strip casting systems
Beschreibungdescription
Die Erfindung betrifft eine Gießduse für Dünnbandgießanlagen, insbesondere zum Vergießen dunner StahlbanderThe invention relates to a casting nozzle for thin strip casting systems, in particular for casting thin steel strips
Nach DE 37 07 897 ist eine Düse zum Gießen dunner Stahlbander bekannt, bei der die Düse einen Ruckdamm bildet, der an einen bewegbaren Trager angrenzt und einen Frontdamm, wobei zwischen Ruckdamm und Frontdamm ein Gießspalt zum Trager hin begrenzt wird Als Trager dient ein umlaufendes StahlbandAccording to DE 37 07 897, a nozzle for casting thin steel strips is known, in which the nozzle forms a jerk dam, which is adjacent to a movable support and a front dam, a casting gap between the ruck dam and the front dam being delimited towards the support
Derartige Düsen bestehen üblicherweise aus feuerfestem Material, das bei den hohen Temperaturen der Stahlschmelze einem gewissen Verschleiß unterliegt, so daß sich wahrend des Gießens die Form des Gießspaltes andern kann, jedenfalls aber nach einer gewissen Standzeit die Düse ausgetauscht werden mußSuch nozzles usually consist of refractory material, which is subject to a certain amount of wear at the high temperatures of the molten steel, so that the shape of the casting gap can change during the casting, but in any case the nozzle must be replaced after a certain service life
Aufgabe der Erfindung war es eine verbesserte Dusenkonstruktion anzugeben, bei der der Verschleiß minimiert wird und bei der die Schmelze im Bereich des Gießspaltes aufgeheizt werden kannThe object of the invention was to provide an improved nozzle design in which wear is minimized and in which the melt can be heated in the region of the casting gap
Die Losung dieser Aufgabe ist in dem kennzeichnenden Merkmal des Patentanspruches 1 angegebenThe solution to this problem is specified in the characterizing feature of claim 1
Erfindungsgemaß wird an der Düse wenigstens ein Pπmaπnduktor und wenigstens einAccording to the invention, at least one Pπmaπnduktor and at least one
Sekundaπnduktor angeordnet, wobei wenigstens ein Sekundannduktor wassergekühlt ist und bis in den Bereich des Gießspaltes hineinragtA secondary inductor is arranged, at least one secondary inductor being water-cooled and projecting into the area of the casting gap
Durch die Verwendung eines Pπmaπnduktors und eines Sekundaπnduktors 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 Sekundaπnduktors nicht bis an die Wandung des Pπmaπnduktors herangelangt, was zu elektrischen Kurzschlüssen fuhren wurde Andererseits kann durch die in dem Sekundannduktor induzierten Strome in der Schmelze selber ein Wirbelstromfeld induziert werden, wodurch eine Aufheizung der Schmelze im Bereich der Ausgießoffnung ermöglicht wird Hierdurch kann verhindert werden, daß die Ausgießoffnung durch Ansätze erstarrter Schmelze verändert wird Des weiteren fuhren die elektromagnetischen Kräfte in der Schmelze zu, einer Verdrängung der Schmelze von dem Sekundannduktor was ebenfalls hilft, Ansätze zu vermeiden Das geschilderte Prinzip wird bei der bekannten "cold crucible technique" benutzt, um Metalle in wassergekühlten Tiegeln zu schmelzenBy using a Pπmaπnduktors and a secondary inductor as separate components for generating an electromagnetic field, which extends into the area of the melt, it can be achieved on the one hand that the melt in the area of the secondary inductor does not reach the wall of the Pπmaπnduktors, which leads to electrical On the other hand, an eddy current field can be induced in the melt itself by the currents induced in the secondary inductor, whereby heating of the melt in the area of the pouring opening is made possible. This can prevent the pouring opening from solidifying due to approaches Melt is changed Furthermore, the electromagnetic forces in the melt lead to displacement of the melt from the secondary inductor, which also helps to avoid deposits. The principle described is used in the known "cold crucible technique" to melt metals in water-cooled crucibles
Nach einer bevorzugten Ausfuhrung besteht ein Sekundannduktor aus mehreren, elektrisch gegeneinander isolierten Abschnitten Hierdurch wirkt jeder Abschnitt als eigener SekundannduktorAccording to a preferred embodiment, a secondary inductor consists of several sections which are electrically insulated from one another. As a result, each section acts as a separate secondary inductor
Nach einer weiter bevorzugten Ausfuhrung sind zwischen Ruck- und Frontdamm mehrere, in Richtung der Duπnbandbreite nebenemanderliegende Ausströmöffnungen für die Schmelze ausgebildetAccording to a further preferred embodiment, a plurality of outflow openings for the melt, which are adjacent to one another in the direction of the thin bandwidth, are formed between the back and front dams
Hierdurch ergibt sich über die Gießspaltbreite (Dunnbandbreite) eine gleichmaßigere Verteilung der Schmelze Die Bildung der Ausströmöffnungen wird durch eine entsprechende Formgebung des Ruckdammes in Richtung auf die Forderrichtung oder durch eine entsprechende Formgebung des Frontdammes entgegen der Forderrichtung erreichtThis results in a more uniform distribution of the melt over the width of the casting gap (thin band width). The formation of the outflow openings is achieved by appropriate shaping of the back dam in the direction of the forward direction or by appropriate shaping of the front dam against the forward direction
Nach einer weiter bevorzugten Ausfuhrung ist ein Sekundaπnduktor im Ruckdamm aus mehreren isolierten Abschnitten mit jeweils einem Zu- und Ablauf für Kuhlwasser aufgebaut, wobei die einzelnen Abschnitte zur Bildung der Ausströmöffnungen der Schmelze schwalbenschwanzformig oder pfeilformig oder gerade ausgebildet sind Im Innern der Abschnitte ist insbesondere ein Stromungsleitblech vorgesehen, so daß zwischen Zu- und Ablauf am dem Gießspalt entgegengesetzten Ende der Abschnitte eine Zwangsfuhrung bis in den dem Gießspalt zugewandten Kopfbereich der Abschnitte erreicht wirdAccording to a further preferred embodiment, a secondary inductor in the Ruckdamm is constructed from a plurality of isolated sections, each with an inlet and outlet for cooling water, the individual sections being dovetailed or arrow-shaped or straight to form the outflow openings of the melt. In particular, a flow baffle is inside the sections provided that between the inlet and outlet at the end of the sections opposite the casting gap, a forced guidance is achieved up to the head region of the sections facing the casting gap
Nach einer anderen bevorzugten Ausbildung sind im Bereich des Frontdammes elektrisch isolierte Abschnitte eines Sekundannduktors mit Zu- und Ablauf für Kuhlwasser angeordnet, wobei im Kopfbereich der Abschnitte, also dort, wo der Frontdamm an den Gießspalt grenzt, zur Bildung von Ausströmöffnungen die Abschnitte schwalbenschwanzformig oder pfeilformig oder gerade ausgebildet sindAccording to another preferred embodiment, electrically insulated sections of a secondary duct with inlet and outlet for cooling water are arranged in the area of the front dam, the sections being dovetailed or arrow-shaped in the head region of the sections, i.e. where the front dam borders the pouring gap, to form outflow openings or are just trained
Soweit hier für den Front- oder Ruckdamm im Bereich der Ausströmöffnungen von Schwalbenschwanz- oder pfeilformigen Form gesprochen wird, soll hiervon jede andere Formgebung, insbesondere auch halbkreisförmig usw verstanden werden Desgleichen soll eingeschlossen sein eine korrespondierende Formgebung von Front- und Ruckdamm, z B auch kreisrunde Ausströmöffnungen gebildet werden können Die gegeneinander isolierten Abschnitte im Frontdamm weisen bevorzugt im Innern ebenfalls Stromungsleitbleche zwischen Zu- und Ablauf aufInsofar as the front or rear dam in the area of the outflow openings is said to have a dovetail or arrow-shaped shape, any other shape, in particular also semicircular, etc., should be understood here. Likewise, a corresponding shape of the front and rear dam should be included, for example circular discharge openings can also be formed. The mutually insulated sections in the front dam preferably also have flow baffles between the inlet and outlet inside
Anhand der Abbildungen wird ein Ausfuhrungsbeispiel einer Düse für Dünnbandgießanlagen schematisch dargestelltOn the basis of the figures, an exemplary embodiment of a nozzle for thin strip casting systems is shown schematically
Die Figur 1 zeigt einen vertikalen Schnitt durch eine Düse, wobei im Bereich des Ruckdammes 2 der Sekundannduktor 22 aus einzelnen Abschnitten mit schwalbenschwanzformigem Ende besteht Der Schnitt ist durch die Mitte des Schwalbenschwanzes 23 gelegt Auf einen Trager 1 , insbesondere ein über Rollen umlaufendes Endlosband ist der Ruckdamm 2 aufgesetzt1 shows a vertical section through a nozzle, the secondary duct 22 in the region of the jerk dam 2 consisting of individual sections with a dovetail-shaped end. The section is placed through the center of the dovetail 23. A carrier 1, in particular an endless belt running over rollers, is the one Ruckdamm 2 put on
Zwischen dem Ruckdamm 2 und dem Frontdamm 3 wird der Gießspalt 4 gebildet An den Sekundannduktor 22 grenzt ein Pnmaπnduktor 21 In den freien Bereich zwischen Schwalbenschwanz 23 und Frontdamm 3 kann der flussige Stahl aus dem Ruckstaubereich 5 in den Erstarrungsbereich 6 durch die mit dem Pfeil 7 angedeutete Stromungsπchtung ausströmen In dem Abschnitt 22 ist ein Stromungsleitblech 24 angeordnet Zum Ruckstaubereich 5 hm wird der Sekundannduktor 22 durch feuerfestes Material 25 abgedeckt Die Induktoren 22, 23 sind wassergekühlt, sie bestehen bevorzugt aus Kupfer Der Pnmaπnduktor 21 wird mit einer Hochfrequenz gespeistThe pouring gap 4 is formed between the jerk dam 2 and the front dam 3. A secondary inductor 21 borders on the secondary duct 22 Flowing out current flow In section 22, a flow baffle 24 is arranged. The secondary inductor 22 is covered by refractory material 25 to the backflow area 5 hm. The inductors 22, 23 are water-cooled, they are preferably made of copper
In der in Figur 2 gezeigten Version wird der Frontdamm 3 durch einen aus mehreren elektrisch voneinander isolierten Sekundaπnduktoren 32 gebildet, in denen ein Pπmaπnduktor 31 einen elektrischen Strom induziert Pπmaπnduktor 31 und Sekundaπnduktor 32 werden mit Wasser gekühlt, und der Pπmaπnduktor 31 wird mit Hochfrequenz gespeist Der Sekundaπnduktor 32 reicht bis über die Schwalbenschwanzspitze des Sekundaπnduktors 22 In the version shown in FIG. 2, the front dam 3 is formed by one of a plurality of electrically isolated secondary inductors 32, in which a magnetic inductor 31 induces an electric current. The magnetic inductor 31 and secondary inductor 32 are cooled with water, and the magnetic inductor 31 is fed with high frequency Secondary inductor 32 extends beyond the dovetail tip of secondary inductor 22

Claims

PatentansprücheClaims
1 Gießduse für Dünnbandgießanlagen mit einem Ruckdamm, der auf einem in Forderπchtung bewegbaren Trager für das Dunnband aufliegt und einem Frontdamm, der in Forderrichtung den Gießspalt zum Trager begrenzt, dadurch gekennzeichnet, daß wenigstens ein Pπmaπnduktor (21 , 31 ) und wenigstens ein Sekundannduktor (22, 32) angeordnet sind, wobei wenigstens ein Sekundannduktor (22, 32) wassergekühlt ist und bis in den Bereich des Gießspaltes (4) hineinragt1 pouring nozzle for thin-strip casting plants with a jerk dam, which rests on a support for the thin band movable in demand and a front dam, which limits the pouring gap to the carrier in the direction of advance, characterized in that at least one Pπmaπnduktor (21, 31) and at least one second inductor (22nd , 32) are arranged, at least one secondary duct (22, 32) being water-cooled and projecting into the area of the casting gap (4)
2 Düse nach Anspruch 1 , dadurch gekennzeichnet, daß ein Sekundannduktor (22, 32) aus mehreren elektrisch gegeneinander isolierten Abschnitten besteht2 Nozzle according to claim 1, characterized in that a secondary inductor (22, 32) consists of several sections which are electrically insulated from one another
3 Düse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zwischen Ruckdamm (2) und Frontdamm (3) mehrere in Richtung der Dunnbandbreite nebenemanderltegende Ausströmöffnungen ausgebildet sind3 Nozzle according to claim 1 or 2, characterized in that between outflow dam (2) and front dam (3) several outflow openings are formed in the direction of the thin band width
4 Düse nach Anspruch 3, dadurch gekennzeichnet, daß ein Sekundannduktor (22) im Ruckdamm (2) aus elektrisch isolierten Abschnitten mit Zu- und Ablauf für Kuhlwasser besteht und zur Bildung der Ausströmöffnungen die Abschnitte schwaibenschwanzformige oder pfeilformig oder gerade ausgebildet sind4 Nozzle according to claim 3, characterized in that a secondary duct (22) in the jerk dam (2) consists of electrically insulated sections with inlet and outlet for cooling water and to form the outflow openings the sections are tail-shaped or arrow-shaped or straight
5 Düse nach Anspruch 3, dadurch gekennzeichnet, daß ein Sekundarspule (32) im Frontdamm (3) aus elektrisch isolierten Abschnitten mit Zu- und Ablauf für Kuhlwasser besteht und zur Bildung der Ausströmöffnungen die Abschnitte schwalbenschwanzformig oder pfeilformig oder gerade ausgebildet sind 5 Nozzle according to claim 3, characterized in that a secondary coil (32) in the front dam (3) consists of electrically insulated sections with inlet and outlet for cooling water and the sections are dovetailed 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 true EP0958074A1 (en) 1999-11-24
EP0958074B1 EP0958074B1 (en) 2001-08-29

Family

ID=26026408

Family Applications (1)

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)

Country Link
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)

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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

Non-Patent Citations (1)

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Title
See references of WO9747412A1 *

Also Published As

Publication number Publication date
JP3132832B2 (en) 2001-02-05
WO1997047412A1 (en) 1997-12-18
EP0958074B1 (en) 2001-08-29
CN1072054C (en) 2001-10-03
ES2159869T3 (en) 2001-10-16
DK0958074T3 (en) 2001-10-08
ATE204794T1 (en) 2001-09-15
AU3164597A (en) 1998-01-07
TR199802192T2 (en) 1999-02-22
JP2000512554A (en) 2000-09-26
AU715986B2 (en) 2000-02-10
RU2153950C1 (en) 2000-08-10
BR9709772A (en) 2000-01-25
US6112954A (en) 2000-09-05
CN1221362A (en) 1999-06-30

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