EP0598212A2 - Device for near net shape casting - Google Patents

Device for near net shape casting Download PDF

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Publication number
EP0598212A2
EP0598212A2 EP93116289A EP93116289A EP0598212A2 EP 0598212 A2 EP0598212 A2 EP 0598212A2 EP 93116289 A EP93116289 A EP 93116289A EP 93116289 A EP93116289 A EP 93116289A EP 0598212 A2 EP0598212 A2 EP 0598212A2
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EP
European Patent Office
Prior art keywords
inductor
boundary plates
melt
ceramic material
boundary
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.)
Withdrawn
Application number
EP93116289A
Other languages
German (de)
French (fr)
Other versions
EP0598212A3 (en
Inventor
Raimund Brückner
Ulrich Hintzen
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.)
Didier Werke AG
Original Assignee
Didier Werke 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
Application filed by Didier Werke AG filed Critical Didier Werke AG
Publication of EP0598212A2 publication Critical patent/EP0598212A2/en
Publication of EP0598212A3 publication Critical patent/EP0598212A3/en
Withdrawn legal-status Critical Current

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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
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams

Definitions

  • the invention relates to a device for the near-dimensional casting of a metal strip from a metal melt, with side plates of a solidification area in which the metal melt meets, for example, between rollers or a conveyor belt or a roller, boundary plates are provided and an electromagnetic inductor is arranged in the region of the boundary plates is.
  • Such a device is described in DE 41 41 508 A1.
  • the boundary plates are formed from metal sheets which are essentially permeable to the magnetic field of the inductor.
  • the magnetic field acts directly on the molten metal by inducing currents in it, which lead to additional heating of the molten metal. This is to prevent the metal melt from freezing on the boundary plates.
  • the currents induced in the melt lead to a disturbance in the edge region of the thin strip. This is associated with a reduction in the quality of the thin strip.
  • porous ceramic inserts are arranged on the boundary plates, which are acted upon by a fluid.
  • the fluid forms a film that prevents the melt from freezing to the boundary plates.
  • the spout inner wall consists of an electrically conductive, inductively heatable ceramic material, for example ZrO2.
  • the object of the invention is to provide a device of the type mentioned, in which freezing of the melt on the boundary plates is avoided and in which the electromagnetic field of the inductor does not influence the metal melt as far as possible.
  • the above object is achieved in a device of the type mentioned in the introduction in that the boundary plates consist of an inductively heatable, refractory, ceramic material which couples to the electromagnetic field of the inductor.
  • the boundary plates are inductively heated by the inductor so that molten metal cannot freeze on them.
  • the boundary plates shield the electromagnetic field from the molten metal. The field can practically not influence the melt. So there are no electrical currents in the melt, which can have an adverse effect on the uniformity of the structure of the thin strip.
  • the device described can be used in the twin roll and in the twin belt process, but is not limited to this. It can also be used in a one-roll process.
  • the boundary plate 3 consists of an electrically conductive, inductively heatable refractory material.
  • it is a resin-bonded or carbon-bonded high-alumina ceramic material.
  • Another suitable material is ZrO2 or has such.
  • the ZrO2 can be stabilized by means of CaO or MgO or Y2O3.
  • An inductor 4 which can be a plate inductor or a spiral inductor, is arranged next to each limiting plate 3.
  • an insulation layer 5 is arranged between the boundary plate 3 and the inductor 4.
  • the boundary plates 3 are inductively heated by the inductor 4 before casting and during casting. As a result, the boundary plates 3 do not withdraw any thermal energy from the steel melt entering the solidification area 2, so that the melt cannot freeze to the boundary plates 3.
  • the boundary plate 3 also shields the electromagnetic field of the inductor 4 from the solidification area 2 or from the melt, so that the electromagnetic field does not act to a significant extent on the melt. There are therefore no currents in the melt which could overheat the melt or which could impress undesired movements.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Ceramic Products (AREA)
  • General Induction Heating (AREA)

Abstract

In a device for near net shape casting, boundary plates (3) are provided to the side of a feed and solidification region (2) in which the metal melt passes between rollers (1) or strikes a conveyor belt, and an electromagnetic inductor (4) is arranged next to these boundary plates. In order to avoid solidification of the melt on the boundary plates (3) and to prevent the electromagnetic field of the inductor (4) from influencing the metal melt, the boundary plates (3) are composed of an inductively heatable, refractory - ceramic - material which is coupled to the electromagnetic field of the inductor (4). <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zum endabmessungsnahen Gießen eines Metallbandes aus einer Metallschmelze, wobei seitlich eines Aufgabe-Erstarrungsbereiches, in dem die Metallschmelze beispielsweise zwischen Rollen oder auf ein Transportband oder auf eine Rolle trifft, Begrenzungsplatten vorgesehen sind und im Bereich der Begrenzungsplatten ein elektromagnetischer Induktor angeordnet ist.The invention relates to a device for the near-dimensional casting of a metal strip from a metal melt, with side plates of a solidification area in which the metal melt meets, for example, between rollers or a conveyor belt or a roller, boundary plates are provided and an electromagnetic inductor is arranged in the region of the boundary plates is.

Eine derartige Einrichtung ist in der DE 41 41 508 A1 beschrieben. Dort sind die Begrenzungsplatten von Metallblechen gebildet, die für das Magnetfeld des Induktors im wesentlichen durchlässig sind. Das Magnetfeld wirkt direkt auf die Metallschmelze, in dem es in ihr Ströme induziert, die zu einer zusätzlichen Erwärmung der Metallschmelze führen. Dadurch soll vermieden sein, daß die Metallschmelze an den Begrenzungsplatten einfriert. Es hat sich jedoch gezeigt, daß die in der Schmelze induzierten Ströme zu einer Störung im Randbereich des Dünnbandes führen. Damit ist eine Qualitätsminderung des Dünnbandes verbunden.Such a device is described in DE 41 41 508 A1. There the boundary plates are formed from metal sheets which are essentially permeable to the magnetic field of the inductor. The magnetic field acts directly on the molten metal by inducing currents in it, which lead to additional heating of the molten metal. This is to prevent the metal melt from freezing on the boundary plates. However, it has been shown that the currents induced in the melt lead to a disturbance in the edge region of the thin strip. This is associated with a reduction in the quality of the thin strip.

In der älteren Patentanmeldung P 41 43 049.2 ist eine ähnliche Einrichtung beschrieben. Bei dieser sind an den Begrenzungsplatten poröse keramische Einsätze angeordnet, die mit einem Fluid beaufschlagt sind. Das Fluid bildet einen Film, der ein Anfrieren der Schmelze an den Begrenzungsplatten verhindert.A similar device is described in the earlier patent application P 41 43 049.2. In this, porous ceramic inserts are arranged on the boundary plates, which are acted upon by a fluid. The fluid forms a film that prevents the melt from freezing to the boundary plates.

In der DE 38 42 690 A1 ist ein Ausguß eines Schmelzengefässes beschrieben. Die Ausgußinnenwand besteht aus einem elektrisch leitfähigen, induktiv aufheizbaren keramischen Material, beispielsweise ZrO₂.A spout of a melt vessel is described in DE 38 42 690 A1. The spout inner wall consists of an electrically conductive, inductively heatable ceramic material, for example ZrO₂.

Aufgabe der Erfindung ist es, eine Einrichtung der eingangs genannten Art anzugeben, bei der ein Einfrieren der Schmelze an den Begrenzungsplatten vermieden ist und bei der das elektromagnetische Feld des Induktors die Metallschmelze möglichst nicht beeinflußt.The object of the invention is to provide a device of the type mentioned, in which freezing of the melt on the boundary plates is avoided and in which the electromagnetic field of the inductor does not influence the metal melt as far as possible.

Erfindungsgemäß ist obige Aufgabe bei einer Einrichtung der eingangs genannten Art dadurch gelöst, daß die Begrenzungsplatten aus einem induktiv aufheizbaren, feuerfesten, keramischen Material bestehen, das an das elektromagnetische Feld des Induktors ankoppelt.According to the invention, the above object is achieved in a device of the type mentioned in the introduction in that the boundary plates consist of an inductively heatable, refractory, ceramic material which couples to the electromagnetic field of the inductor.

Die Begrenzungsplatten werden von dem Induktor induktiv erhitzt, so daß an ihnen Metallschmelze nicht anfrieren kann. Außerdem schirmen die Begrenzungsplatten das elektromagnetische Feld gegenüber der Metallschmelze ab. Das Feld kann also die Schmelze praktisch nicht beeinflussen. Es entstehen also in der Schmelze keine elektrischen Ströme, die sich auf die Gleichmäßigkeit der Struktur des Dünnbandes ungünstig auswirken können.The boundary plates are inductively heated by the inductor so that molten metal cannot freeze on them. In addition, the boundary plates shield the electromagnetic field from the molten metal. The field can practically not influence the melt. So there are no electrical currents in the melt, which can have an adverse effect on the uniformity of the structure of the thin strip.

Die beschriebene Einrichtung ist sowohl beim Twin roll- und beim Twin belt-Verfahren verwendbar, aber nicht darauf beschränkt. Sie läßt sich auch bei einem Einrollenverfahren verwenden.The device described can be used in the twin roll and in the twin belt process, but is not limited to this. It can also be used in a one-roll process.

Weitere vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüchen und der folgenden Beschreibung eines Ausführungsbeispiels.Further advantageous configurations result from the subclaims and the following description of an exemplary embodiment.

In der Zeichnung zeigen:

Figur 1
die Einrichtung bei einer Twin roll-Anlage in Seitenansicht schematisch und
Figur 2
eine Teilaufsicht der Anlage.
The drawing shows:
Figure 1
the setup of a twin roll system in side view schematically and
Figure 2
a partial supervision of the plant.

Zwischen zwei Rollen 1 besteht ein Aufgabe-Erstarrungsbereich 2, der beidseitig durch Begrenzungsplatten 3 abgeschlossen ist. In den Figuren ist nur eine der Begrenzungsplatten 3 zu sehen.Between two rollers 1 there is a solidification area 2, which is closed on both sides by boundary plates 3. Only one of the boundary plates 3 can be seen in the figures.

Die Begrenzungsplatte 3 besteht aus einem elektrisch leitenden, induktiv aufheizbaren feuerfesten Material. Es handelt sich beispielsweise um ein harzgebundenes oder kohlenstoffgebundenes tonerdereiches keramisches Material. Ein anderes geeignetes Material ist ZrO₂ oder weist solches auf. Mittels CaO oder MgO oder Y₂O₃ kann das ZrO₂ stabilisiert sein.The boundary plate 3 consists of an electrically conductive, inductively heatable refractory material. For example, it is a resin-bonded or carbon-bonded high-alumina ceramic material. Another suitable material is ZrO₂ or has such. The ZrO₂ can be stabilized by means of CaO or MgO or Y₂O₃.

Neben jeder Begrenzungsplatte 3 ist ein Induktor 4 angeordnet, der ein Platteninduktor oder ein Spiralinduktor sein kann. Zur thermischen Isolation des Induktors 4 gegenüber der Begrenzungsplatte 3 ist zwischen der Begrenzungsplatte 3 und dem Induktor 4 eine Isolationsschicht 5 angeordnet.An inductor 4, which can be a plate inductor or a spiral inductor, is arranged next to each limiting plate 3. For thermal insulation of the inductor 4 from the boundary plate 3, an insulation layer 5 is arranged between the boundary plate 3 and the inductor 4.

Die Begrenzungsplatten 3 werden vor dem Angießen und während des Gießens von dem Induktor 4 induktiv aufgeheizt. Die Begrenzungsplatten 3 entziehen dadurch der in den Aufgabe-Erstarrungsbereich 2 eintretenden Stahlschmelze keine thermische Energie, so daß die Schmelze an den Begrenzungsplatten 3 nicht anfrieren kann.The boundary plates 3 are inductively heated by the inductor 4 before casting and during casting. As a result, the boundary plates 3 do not withdraw any thermal energy from the steel melt entering the solidification area 2, so that the melt cannot freeze to the boundary plates 3.

Die Begrenzungsplatte 3 schirmt auch das elektromagnetische Feld des Induktors 4 gegenüber dem Aufgabe-Erstarrungsbereich 2 bzw. gegenüber der Schmelze ab, so daß das elektromagnetische Feld nicht in einem entscheidenden Maße auf die Schmelze wirkt. Es entstehen also in der Schmelze keine Ströme, die die Schmelze zonal überhitzen könnten oder dieser unerwünschte Bewegungen aufprägen könnten.The boundary plate 3 also shields the electromagnetic field of the inductor 4 from the solidification area 2 or from the melt, so that the electromagnetic field does not act to a significant extent on the melt. There are therefore no currents in the melt which could overheat the melt or which could impress undesired movements.

Claims (5)

Einrichtung zum endabmessungsnahen Gießen eines Metallbandes aus einer Metallschmelze, wobei seitlich eines Aufgabe-Erstarrungsbereichs, in dem die Metallschmelze beispielsweise zwischen Rollen oder auf ein Transportband oder auf eine Rolle trifft, Begrenzungsplatten vorgesehen sind und im Bereich der Begrenzungsplatten ein elektromagnetischer Induktor angeordnet ist,
dadurch gekennzeichnet,
daß die Begrenzungsplatten (3) aus einem induktiv aufheizbaren, feuerfesten, keramischen Material bestehen, das an das elektromagnetische Feld des Induktors (4) ankoppelt.Device for casting a metal strip from a molten metal close to the final dimensions, limiting plates being provided on the side of a solidification area in which the molten metal meets, for example, between rollers or on a conveyor belt or on a roller, and an electromagnetic inductor is arranged in the region of the limiting plates,
characterized,
that the boundary plates (3) consist of an inductively heatable, refractory, ceramic material which couples to the electromagnetic field of the inductor (4). Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß das induktiv aufheizbare, feuerfeste keramische Material ein harzgebundenes oder kohlenstoffgebundenes, tonerdereiches keramisches Material ist.Device according to claim 1,
characterized,
that the inductively heatable, refractory ceramic material is a resin-bonded or carbon-bonded, alumina-rich ceramic material. Einrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß das induktiv aufheizbare, keramische Material ZrO₂ ist oder aufweist.Device according to claim 1 or 2,
characterized,
that the inductively heatable, ceramic material is ZrO₂ or has. Einrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß das ZrO₂ mittels CaO oder MgO oder Y₂O₃ stabilisiert ist.Device according to claim 3,
characterized,
that the ZrO₂ is stabilized by means of CaO or MgO or Y₂O₃. Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß das Material aus Graphit, und/oder B4C, SiC, Titancarbid besteht oder enthält.Device according to claim 1,
characterized,
that the material consists of graphite, and / or B4C, SiC, titanium carbide or contains.
EP93116289A 1992-11-11 1993-10-08 Device for near net shape casting. Withdrawn EP0598212A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924238036 DE4238036A1 (en) 1992-11-11 1992-11-11 Device for casting close to final dimensions
DE4238036 1992-11-11

Publications (2)

Publication Number Publication Date
EP0598212A2 true EP0598212A2 (en) 1994-05-25
EP0598212A3 EP0598212A3 (en) 1996-06-12

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EP93116289A Withdrawn EP0598212A3 (en) 1992-11-11 1993-10-08 Device for near net shape casting.

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EP (1) EP0598212A3 (en)
JP (1) JPH06210409A (en)
DE (1) DE4238036A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2293999A (en) * 1994-10-14 1996-04-17 Ishikawajima Harima Heavy Ind Strip casting
EP0800880A2 (en) * 1996-04-18 1997-10-15 Ishikawajima-Harima Heavy Industries Co., Ltd. Method and apparatus for casting metal strip
EP0807476A2 (en) * 1996-05-13 1997-11-19 Ishikawajima-Harima Heavy Industries Co., Ltd. Method and apparatus for casting metal strip
AU703835B2 (en) * 1994-10-14 1999-04-01 Bhp Steel (Jla) Pty Limited Metal casting
AU722566B2 (en) * 1996-04-18 2000-08-03 Bhp Steel (Jla) Pty Limited Strip casting

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4407585C2 (en) * 1994-03-08 1996-09-19 Mtu Friedrichshafen Gmbh Variable valve timing
FR2787361B1 (en) * 1998-12-22 2001-02-02 Usinor SIDE SIDE FOR SHUTTERING THE CASTING SPACE OF A METAL THIN STRIP CASTING INSTALLATION

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277156A (en) * 1985-09-30 1987-04-09 Nippon Steel Corp Twin roll type continuous casting device
JPS63126646A (en) * 1986-11-17 1988-05-30 Nippon Mining Co Ltd Dam for twin roll type continuous casting
JPS63238954A (en) * 1987-03-27 1988-10-05 Kawasaki Steel Corp Short side plate for strip production apparatus
EP0447940A1 (en) * 1990-03-14 1991-09-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Sintered product for making sheath used for continuous thin plate molding apparatus and sheath using the same
EP0491641A1 (en) * 1990-12-17 1992-06-24 Usinor Sacilor Continuous casting machine for casting thin metal strip, especially of steel
EP0496646A1 (en) * 1991-01-25 1992-07-29 Usinor Sacilor Side dam for a twin roll type continuous casting machine
EP0593383A1 (en) * 1992-10-16 1994-04-20 Usinor Sacilor Apparatus for twin roll continuous casting of thin metallic products

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277156A (en) * 1985-09-30 1987-04-09 Nippon Steel Corp Twin roll type continuous casting device
JPS63126646A (en) * 1986-11-17 1988-05-30 Nippon Mining Co Ltd Dam for twin roll type continuous casting
JPS63238954A (en) * 1987-03-27 1988-10-05 Kawasaki Steel Corp Short side plate for strip production apparatus
EP0447940A1 (en) * 1990-03-14 1991-09-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Sintered product for making sheath used for continuous thin plate molding apparatus and sheath using the same
EP0491641A1 (en) * 1990-12-17 1992-06-24 Usinor Sacilor Continuous casting machine for casting thin metal strip, especially of steel
EP0496646A1 (en) * 1991-01-25 1992-07-29 Usinor Sacilor Side dam for a twin roll type continuous casting machine
EP0593383A1 (en) * 1992-10-16 1994-04-20 Usinor Sacilor Apparatus for twin roll continuous casting of thin metallic products

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011 no. 278 (M-623) ,9.September 1987 & JP-A-62 077156 (NIPPON STEEL CORP;OTHERS: 01) 9.April 1987, *
PATENT ABSTRACTS OF JAPAN vol. 012 no. 376 (M-750) ,7.Oktober 1988 & JP-A-63 126646 (NIPPON MINING CO LTD) 30.Mai 1988, *
PATENT ABSTRACTS OF JAPAN vol. 013 no. 028 (M-788) ,23.Januar 1989 & JP-A-63 238954 (KAWASAKI STEEL CORP) 5.Oktober 1988, *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2293999A (en) * 1994-10-14 1996-04-17 Ishikawajima Harima Heavy Ind Strip casting
GB2293999B (en) * 1994-10-14 1998-04-08 Ishikawajima Harima Heavy Ind Metal casting
AU703835B2 (en) * 1994-10-14 1999-04-01 Bhp Steel (Jla) Pty Limited Metal casting
EP0800880A2 (en) * 1996-04-18 1997-10-15 Ishikawajima-Harima Heavy Industries Co., Ltd. Method and apparatus for casting metal strip
EP0800880A3 (en) * 1996-04-18 1998-12-30 Ishikawajima-Harima Heavy Industries Co., Ltd. Method and apparatus for casting metal strip
AU722566B2 (en) * 1996-04-18 2000-08-03 Bhp Steel (Jla) Pty Limited Strip casting
EP0807476A2 (en) * 1996-05-13 1997-11-19 Ishikawajima-Harima Heavy Industries Co., Ltd. Method and apparatus for casting metal strip
EP0807476A3 (en) * 1996-05-13 1998-04-22 Ishikawajima-Harima Heavy Industries Co., Ltd. Method and apparatus for casting metal strip

Also Published As

Publication number Publication date
JPH06210409A (en) 1994-08-02
EP0598212A3 (en) 1996-06-12
DE4238036A1 (en) 1994-05-19

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