EP0755740B1 - Method and apparatus for induction heating of a refractory article - Google Patents

Method and apparatus for induction heating of a refractory article Download PDF

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Publication number
EP0755740B1
EP0755740B1 EP96110899A EP96110899A EP0755740B1 EP 0755740 B1 EP0755740 B1 EP 0755740B1 EP 96110899 A EP96110899 A EP 96110899A EP 96110899 A EP96110899 A EP 96110899A EP 0755740 B1 EP0755740 B1 EP 0755740B1
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EP
European Patent Office
Prior art keywords
interior
article
inductor
insulation
refractory
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EP96110899A
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German (de)
French (fr)
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EP0755740A1 (en
Inventor
Raimund Brückner
Rüdiger Dr. Grau
Daniel Grimm
Steve Lee
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Didier Werke AG
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Didier Werke AG
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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B22D41/01—Heating means
    • B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/38—Coil arrangements specially adapted for fitting into hollow spaces of workpieces

Definitions

  • the invention relates to a method for inductive heating a refractory molded part according to the preamble of the claim 1.
  • Such molded parts are in particular part of a melt outlet device or melt feed device at one metallurgical vessel. They are preheated to an unwanted one Cooling the flowing melt, in particular to avoid their freezing.
  • DE-A-3 842 690 describes a refractory spout for one Continuous caster known, the pouring channel outside of one Induction coil is surrounded, with which the inner outer wall is controlled inductively heated. Since the coil is part of the Pouring component, it is a complex and expensive solution because such refractory pouring moldings Are wearing parts.
  • Fireproof molded parts are usually used Gas burners heated up. This has the disadvantage of being there carbon can burn out Material component of the molding is. It is unfavorable also that when it heats up to an uneven Temperature distribution in the molded part comes. For example, Differences in temperature of about 400 K were observed. About that in addition, the heating up takes a considerable amount of time Claim.
  • a method of the type mentioned is from EP-A-0 487 924 known.
  • a heating device is used the completion of the manufacture of an immersion nozzle thermal treatment.
  • the heating device can also be used to heat the immersion nozzle so that this is preheated to a desired temperature in a Chill mold can be used.
  • From US-A-2 806 117 is an inductor for the heat treatment known metallic workpieces, whose magnetic coil arranged in the interior of the circular cylindrical workpiece can be. Again, only the inner surface areas of the tubular workpiece is heated.
  • the object of the invention is to provide a quick and uniform To allow the refractory molded part to be recorded.
  • this object is in a method of initially mentioned type with the measures of claim 1 solved.
  • the invention increases plant availability achieved because cracking and freezing problems are avoided.
  • the process is not only suitable for heating up Casting on, but also for heating up in the event of interruptions in casting, to keep the molding at an appropriate temperature.
  • a special embodiment of the method is characterized by this that an inner inductor is used, which consists of a or a plurality of cooled induction coils is formed.
  • the figure shows a fireproof molded part as a feed channel for a twin roll caster with an inserted internal inductor.
  • a feed channel known in its form is a Refractory molded part (1) made of a ceramic, carbon-containing Material that is inductive to an alternating electrical field can be coupled with the consequence of heating.
  • the Feed channel has a channel-shaped interior (2) rectangular cross section.
  • the feed channel is in one outer part with a metallic outer jacket (3) provided, as is often the case when using so-called ETA changers used.
  • the metallic outer jacket (3) shields electromagnetic fields from the supply channel, so the feed channel with an outer induction coil would not be heated evenly.
  • the inner inductor (4) is in its Dimensions, in particular the length of the interior (2) adjusted so that it extends over the entire length if possible of the interior (2) extends. In addition, its outer geometry adapted to the dimensions of the interior (2).
  • the inner inductor (4) has a number of cooled induction coils (5) a generator (6) are connected.
  • the interior (2) is opposite Internal inductor (4) with a layer (12), for example a ceramic glaze, electrically and / or thermally insulated so that the refractory molded part (1) does not electrical parts come into contact and / or no zonal Overheating occurs.
  • the outer surface of the Internal inductor (4) by means of an insulation molding (7) against the surfaces of the interior (2) electrically and / or thermally insulated.
  • the internal inductor (4) has different geometries or Adjust wall thicknesses in such a way that different distances between the Internal inductor (4) and the surfaces of the areas to be heated exist. With This measure produces different energy densities in the molded part (1), what the uniformity of heating with different wall thicknesses improved.
  • the molded insulation part (7) is to be designed accordingly.
  • the molded insulation part (7) also serves to center the inner inductor (4) in the Interior (2).
  • the molded insulation part (7) is on the induction coil (5) slid in place so that it can be replaced if necessary.
  • the outer geometry of the molded insulation part (7) is adapted to the interior (2), that it can be easily inserted and removed with the inner inductor (4) into the interior (2) the interior (2) can be pulled out.
  • the design can also be so be taken that first the molded insulation part (7) in the interior (2) and then the inner inductor (4) is to be inserted into the molded insulation part (7).
  • the molded insulation part (7) has a top to limit insertion Flange (8). It's open below. In other applications, e.g. at The insulation molding (7) can be provided with supply channels with lateral outflow openings. be closed by means of a base.
  • the molded insulation part (7) consists of a highly heat-resistant, ceramic Fiber material or ceramic foam material.
  • the molded insulation part (7) or the molded insulation parts do not have to be removed from the Interior (2) can be pulled out. It is also possible to isolate the molded part (7) or to design the molded insulation parts as the lining of the interior (2).
  • the supply duct can, preferably with an external insulation (11) ceramic fiber material or ceramic foam material. This improves the rapid and even heating of the feed channel.
  • the inner inductor (4) is connected to the Insulation molded part (7) inserted into the interior (2) and the generator (6) is switched on.
  • the feed channel is essentially above its entire cross section heated quickly and evenly inductively.
  • the target temperature is the internal inductor (4) from the supply channel pulled out. This is then pre-heated and ready for the casting operation.
  • the Internal inductor (4) can be used for many heating processes on many supply channels use. Its use is therefore due to the wear of the feed channel independently.
  • the molded insulation part (7) can, if it is worn, by the Pull off the inner inductor (4) and replace it with a new molded insulation part. at different cross-sections of supply channels can be used to form insulation parts (7) with different dimensions. It is This makes it possible to use the inner inductor (4) even with different Insert interior geometries centered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

Inductive pre-heating process for a channel-like refractory body of substantially rectangular internal cross-section, uses an internal inductor (4) inserted in the interior (2) of the body and removed after heating the body. Apparatus is also claimed.

Description

Die Erfindung betrifft ein Verfahren zum induktiven Aufheizen eines feuerfesten Formteils nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for inductive heating a refractory molded part according to the preamble of the claim 1.

Solche Formteile sind insbesondere Teil einer Schmelzenauslassvorrichtung bzw. Schmelzenaufgabevorrichtung bei einem metallurgischen Gefäß. Sie werden vorgeheizt, um ein unerwünschtes Abkühlen der durchfließenden Schmelze, insbesondere deren Einfrieren, zu vermeiden.Such molded parts are in particular part of a melt outlet device or melt feed device at one metallurgical vessel. They are preheated to an unwanted one Cooling the flowing melt, in particular to avoid their freezing.

Aus der DE-A-3 842 690 ist ein feuerfester Ausguss für eine Stranggießanlage bekannt, dessen Ausgusskanal außen von einer Induktionsspule umgeben ist, mit welcher die innere Außenwand geregelt induktiv aufheizbar ist. Da die Spule Bestandteil des Ausgussbauteils ist, handelt es sich um eine aufwendige und teure Lösung, weil solche feuerfesten Ausgussformteile Verschleißteile sind. DE-A-3 842 690 describes a refractory spout for one Continuous caster known, the pouring channel outside of one Induction coil is surrounded, with which the inner outer wall is controlled inductively heated. Since the coil is part of the Pouring component, it is a complex and expensive solution because such refractory pouring moldings Are wearing parts.

Üblicherweise werden feuerfeste Ausgussformteile mittels Gasbrennern aufgeheizt. Dies hat den Nachteil, dass es dabei zu einem Ausbrennen des Kohlenstoffs kommen kann, der Materialbestandteil des Formteils ist. Ungünstig ist dabei außerdem, dass es beim Aufheizen zu einer ungleichmäßigen Temperaturverteilung im Formteil kommt. Es wurden bspw. Temperaturunterschiede von etwa 400 K beobachtet. Darüber hinaus nimmt das Aufheizen eine beträchtliche Zeit in Anspruch.Fireproof molded parts are usually used Gas burners heated up. This has the disadvantage of being there carbon can burn out Material component of the molding is. It is unfavorable also that when it heats up to an uneven Temperature distribution in the molded part comes. For example, Differences in temperature of about 400 K were observed. About that in addition, the heating up takes a considerable amount of time Claim.

Ein Verfahren der eingangs genannten Art ist aus der EP-A-0 487 924 bekannt. Hierbei dient eine Aufheizvorrichtung der Beendigung der Herstellung eines Eintauchausgusses durch thermische Behandlung. Die Aufheizvorrichtung, kann auch dem Beheizen des Eintauchausgusses dienen, so dass dieser auf eine gewünschte Temperatur vorgeheizt in eine Kokille eingesetzt werden kann.A method of the type mentioned is from EP-A-0 487 924 known. Here, a heating device is used the completion of the manufacture of an immersion nozzle thermal treatment. The heating device, can also be used to heat the immersion nozzle so that this is preheated to a desired temperature in a Chill mold can be used.

Aus der US-A-2 237 866 ist eine Wärmebehandlungsspule bekannt, welche in eine Bohrung des Artikels eingeführt werden kann, um die inneren Oberflächenteile des Artikels durch einen hochfrequenten Magnetfluss zu erhitzen.From US-A-2 237 866 a heat treatment coil is known which can be inserted into a hole in the article, around the inner surface parts of the article by a to heat high-frequency magnetic flux.

Aus der US-A-2 806 117 ist ein Induktor für die Wärmebehandlung metallischer Werkstücke bekannt, dessen Magnetspule in dem Innenraum des kreiszylindrischen Werkstückes angeordnet werden kann. Auch hierbei werden nur die inneren Oberflächenbereiche des rohrförmigen Werkstückes erhitzt.From US-A-2 806 117 is an inductor for the heat treatment known metallic workpieces, whose magnetic coil arranged in the interior of the circular cylindrical workpiece can be. Again, only the inner surface areas of the tubular workpiece is heated.

Aus der US-A-1 607 264 sind ein Verfahren und Mittel zum elektrischen Aufheizen von Scheiben oder Platten bekannt, wobei eine Magnetspule so in die zentrale Öffnung eingeführt wird, dass nur der die Öffnung unmittelbar begrenzende Scheiben- oder Plattenbereich erhitzt wird. From US-A-1 607 264 a method and means for electrical heating of panes or plates known with a solenoid so inserted into the central opening is that only the one immediately limiting the opening Disk or plate area is heated.

Aufgabe der Erfindung ist es, ein rasches und gleichmäßiges Aufzeizen des feuerfesten Formteils zu ermöglichen.The object of the invention is to provide a quick and uniform To allow the refractory molded part to be recorded.

Erfindungsgemäß ist diese Aufgabe bei einem Verfahren der eingangs genannten Art mit den Maßnahmen des Anspruchs 1 gelöst.According to the invention, this object is in a method of initially mentioned type with the measures of claim 1 solved.

Dabei erfolgt ein rasches und gleichmäßiges Aufheizen des feuerfesten Formteils, das bspw. ein Zufuhr- und Dosiersystem für einen Belt- oder Twin-Roll-Caster ist, mit dem der Schmelzenausfluss unterbrechbar und/oder steuer- bzw. regelbar ist.This is a quick and even heating of the refractory molded part, for example a feed and metering system for a belt or twin roll caster with which the The melt discharge can be interrupted and / or controlled or regulated is.

Durch die Erfindung ist eine erhöhte Anlagenverfügbarkeit erreicht, weil Riss- und Einfrierprobleme vermieden werden. Das Verfahren eignet sich nicht nur zum Aufheizen beim Angießen, sondern auch zum Aufheizen bei Gießunterbrechungen, um das Formteil auf einer geeigneten Temperatur zu halten. The invention increases plant availability achieved because cracking and freezing problems are avoided. The process is not only suitable for heating up Casting on, but also for heating up in the event of interruptions in casting, to keep the molding at an appropriate temperature.

Eine besondere Ausführung des Verfahrens zeichnet sich dadurch aus, dass ein Inneninduktor verwendet wird, welcher aus einer oder mehreren gekühlten Induktionsspulen gebildet ist.A special embodiment of the method is characterized by this that an inner inductor is used, which consists of a or a plurality of cooled induction coils is formed.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den weiteren Unteransprüchen und der folgenden Beschreibung eines Ausführungsbeispiels.Advantageous refinements of the invention result from the further subclaims and the following description of an embodiment.

Die Figur zeigt ein feuerfestes Formteil als Zufuhrkanal für einen Twin-Roll-Caster mit einem eingesetzten Inneninduktor.The figure shows a fireproof molded part as a feed channel for a twin roll caster with an inserted internal inductor.

Ein in seiner Form an sich bekannter Zufuhrkanal ist ein feuerfestes Formteil (1) aus einem keramischen, kohlenstoffhaltigen Material, das induktiv an ein elektrisches Wechselfeld mit der Folge einer Aufheizung ankoppelbar ist. Der Zufuhrkanal weist einen kanalförmigen Innenraum (2) mit rechteckigem Querschnitt auf. Der Zufuhrkanal ist in einem äußeren Teilbereich mit einem metallischen Außenmantel (3) versehen, wie man ihn häufig beim Einsatz von sogenannten ETA-Wechslern verwendet. Der metallische Außenmantel (3) schirmt also elektromagnetische Felder gegenüber dem Zufuhrkanal ab, so dass der Zufuhrkanal mit einer äußeren Induktionsspule nicht gleichmäßig aufheizbar wäre.A feed channel known in its form is a Refractory molded part (1) made of a ceramic, carbon-containing Material that is inductive to an alternating electrical field can be coupled with the consequence of heating. The Feed channel has a channel-shaped interior (2) rectangular cross section. The feed channel is in one outer part with a metallic outer jacket (3) provided, as is often the case when using so-called ETA changers used. The metallic outer jacket (3) shields electromagnetic fields from the supply channel, so the feed channel with an outer induction coil would not be heated evenly.

In dem in der Figur dargestellten Zustand ist in den Innenraum (2) mit rechteckigem Querschnitt ein Inneninduktor (4) eingeschoben. Der Inneninduktor (4) ist dabei in seinen Abmessungen, insbesondere in seiner Länge dem Innenraum (2) so angepasst, dass er sich möglichst über die gesamte Länge des Innenraums (2) erstreckt. Außerdem ist seine Außengeometrie den Abmessungen des Innenraumes (2) angepasst. In the state shown in the figure is in the interior (2) with an rectangular cross section an internal inductor (4) inserted. The inner inductor (4) is in its Dimensions, in particular the length of the interior (2) adjusted so that it extends over the entire length if possible of the interior (2) extends. In addition, its outer geometry adapted to the dimensions of the interior (2).

Der Inneninduktor (4) weist mehrere gekühlte Induktionsspulen (5) auf, die an einen Generator (6) angeschlossen sind. Der Innenraum (2) ist gegenüber dem Inneninduktor (4) mit einer Schicht (12), beispielsweise einer keramischen Glasur, elektrisch und/oder thermisch isoliert, damit das feuerfeste Formteil (1) nicht mit elektrische Spannung führenden Teilen in Berührung kommt und/oder keine zonale Überhitzung erfolgt.The inner inductor (4) has a number of cooled induction coils (5) a generator (6) are connected. The interior (2) is opposite Internal inductor (4) with a layer (12), for example a ceramic glaze, electrically and / or thermally insulated so that the refractory molded part (1) does not electrical parts come into contact and / or no zonal Overheating occurs.

In einer weiteren Ausgestaltung der Erfindung ist die Außenfläche des Inneninduktors (4) mittels eines Isolationsformteils (7) gegenüber den Oberflächen des Innenraumes (2) elektrisch und/oder thermisch isoliert.In a further embodiment of the invention, the outer surface of the Internal inductor (4) by means of an insulation molding (7) against the surfaces of the interior (2) electrically and / or thermally insulated.

Vorteilhaft ist auch, den Inneninduktor (4) unterschiedlichen Geometrien oder Wandstärken anzupassen, dergestalt, daß verschiedene Abstände zwischen dem Inneninduktor (4) und den Oberflächen der aufzuheizenden Bereiche bestehen. Mit dieser Maßnahme werden unterschiedliche Energiedichten im Formteil (1) erzeugt, was die Gleichmäßigkeit der Aufheizung bei unterschiedlichen Wandstärken verbessert. Das Isolationsformteil (7) ist entsprechend zu gestalten.It is also advantageous that the internal inductor (4) has different geometries or Adjust wall thicknesses in such a way that different distances between the Internal inductor (4) and the surfaces of the areas to be heated exist. With This measure produces different energy densities in the molded part (1), what the uniformity of heating with different wall thicknesses improved. The molded insulation part (7) is to be designed accordingly.

Das Isolationsformteil (7) dient auch der Zentrierung des Inneninduktors (4) im Innenraum (2). Das Isolationsformteil (7) ist auf die Induktionsspule (5) reibschlüssig aufgeschoben, so daß es im Bedarfsfall auswechselbar ist. Die Außengeometrie des Isolationsformteils (7) ist so an den Innenraum (2) angepaßt, daß es mit dem Inneninduktor (4) leicht in den Innenraum (2) einschiebbar und aus dem Innenraum (2) herausziehbar ist. Die Gestaltung kann jedoch auch so getroffen sein, daß zunächst das Isolationsformteil (7) in den Innenraum (2) und dann der Inneninduktor (4) in das Isolationsformteil (7) einzuschieben ist. The molded insulation part (7) also serves to center the inner inductor (4) in the Interior (2). The molded insulation part (7) is on the induction coil (5) slid in place so that it can be replaced if necessary. The The outer geometry of the molded insulation part (7) is adapted to the interior (2), that it can be easily inserted and removed with the inner inductor (4) into the interior (2) the interior (2) can be pulled out. However, the design can also be so be taken that first the molded insulation part (7) in the interior (2) and then the inner inductor (4) is to be inserted into the molded insulation part (7).

Das Isolationsformteil (7) weist oben zur Begrenzung des Einschiebens einen Flansch (8) auf. Unten ist es offen. Bei anderen Anwendungen, z.B. bei Zufuhrkanälen mit seitlichen Ausströmöffnungen kann das Isolationsformteil (7) mittels eines Bodens verschlossen sein.The molded insulation part (7) has a top to limit insertion Flange (8). It's open below. In other applications, e.g. at The insulation molding (7) can be provided with supply channels with lateral outflow openings. be closed by means of a base.

Um den Zufuhrkanal auch in seinem erweiterten Kopfbereich (9) aufzuheizen, ist der Inneninduktor (4) oberhalb des Flansches (8) mit einer zusätzlichen Windung (10) versehen.In order to heat up the supply channel also in its enlarged head area (9) the inner inductor (4) above the flange (8) with an additional turn (10).

Das Isolationsformteil (7) besteht aus einem hochhitzebeständigen, keramischen Fasermaterial oder keramischen Schaummaterial .The molded insulation part (7) consists of a highly heat-resistant, ceramic Fiber material or ceramic foam material.

Es ist nicht notwendig, daß sich das Isolationsformteil (7) über die gesamte Länge des Inneninduktors (4) erstreckt. Es können auch zwei oder mehrere Isolationsformteile verteilt vorgesehen sein.It is not necessary for the insulation molding (7) to extend over the entire length of the inner inductor (4) extends. You can also use two or more Insulated molded parts can be provided distributed.

Das Isolationsformteil (7) bzw. die Isolationsformteile müssen nicht aus dem Innenraum (2) herausziehbar sein. Es ist auch möglich, das Isolationsformteil (7) bzw. die Isolationsformteile als Auskleidung des Innenraums (2) zu gestalten.The molded insulation part (7) or the molded insulation parts do not have to be removed from the Interior (2) can be pulled out. It is also possible to isolate the molded part (7) or to design the molded insulation parts as the lining of the interior (2).

Um zu vermeiden, daß der Zufuhrkanal beim Aufheizen Wärme nach außen abstrahlt, d.h. verliert, kann er mit einer Außenisolierung (11), vorzugsweise aus keramischem Fasermaterial oder keramischem Schaummaterial versehen sein. Diese verbessert die rasche und gleichmäßige Aufheizung des Zufuhrkanals. To prevent the supply duct from heat to the outside when heating emits, i.e. loses, it can, preferably with an external insulation (11) ceramic fiber material or ceramic foam material. This improves the rapid and even heating of the feed channel.

Soll der Zufuhrkanal aufgeheizt werden, dann wird der Inneninduktor (4) mit dem Isolationsformteil (7) in den Innenraum (2) eingeschoben und der Generator (6) wird eingeschaltet. Dadurch wird der Zufuhrkanal im wesentlichen über seinen gesamten Querschnitt rasch und gleichmäßig induktiv aufgeheizt. Nach Erreichen der Solltemperatur wird der Inneninduktor (4) aus dem Zufuhrkanal herausgezogen. Dieser steht dann vorgeheizt für den Gießbetrieb bereit. Der Inneninduktor (4) läßt sich für viele Aufheizvorgänge an vielen Zufuhrkanälen verwenden. Seine Einsatzmöglichkeit ist dadurch vom Verschleiß des Zufuhrkanals unabhängig. Das Isolationsformteil (7) läßt sich, wenn es verschlissen ist, von dem Inneninduktor (4) abziehen und durch ein neues Isolationsformteil ersetzen. Bei unterschiedlichen Querschnitten von Zufuhrkanälen können Isolationsformteile (7) mit entsprechend unterschiedlichen Abmessungen bereitgehalten werden. Es ist dadurch möglich, den Inneninduktor (4) auch bei unterschiedlichen Innenraumgeometrien jeweils zentriert einzuschieben.If the supply duct is to be heated, then the inner inductor (4) is connected to the Insulation molded part (7) inserted into the interior (2) and the generator (6) is switched on. As a result, the feed channel is essentially above its entire cross section heated quickly and evenly inductively. After reaching The target temperature is the internal inductor (4) from the supply channel pulled out. This is then pre-heated and ready for the casting operation. The Internal inductor (4) can be used for many heating processes on many supply channels use. Its use is therefore due to the wear of the feed channel independently. The molded insulation part (7) can, if it is worn, by the Pull off the inner inductor (4) and replace it with a new molded insulation part. at different cross-sections of supply channels can be used to form insulation parts (7) with different dimensions. It is This makes it possible to use the inner inductor (4) even with different Insert interior geometries centered.

Claims (15)

  1. Method for inductive heating of a refractory article (1) of ceramic material using an inductor, characterized in that an article (1) is used having a channel-shaped interior (2) having a rectangular-like cross section, that an inductor is used which in its dimensions and in its outer geometry is adapted to the dimensions of the interior (2), that the inductor is built into the interior (2) as an interior inductor (4), that the interior inductor (4) is isolated from the surface of the interior (2), that by means of the interior inductor (4) the article (1) is heated about its complete cross section and that thereafter the interior inductor (4) is taken out of the interior (2).
  2. Method according to claim 1, characterized in that as an article (1) a refractory feeding channel for liquid metal, in particular steel, is used.
  3. Method according to claim 1 or 2, characterized in that the article (1) comprises a metallic outer coat (3) at least in a partial section.
  4. Method according to one of claims 1 to 3, characterized in that an interior inductor (4) made of one or several cooled induction coils (5) is used.
  5. Method according to one of claims 1 to 4, characterized in that as an insulation between the interior inductor (4) and the surface of the interior (2) an electrically and/or thermically insulating insulation article (7) or an electrically and/or thermically insulating layer (12) is provided.
  6. Method according to one of the preceding claims, characterized in that the distance of the interior inductor (4) from the surfaces of the areas of the refractory article (1) to be heated are adjusted in such a way that varying amounts of energy are transmittable.
  7. Method according to one of the preceding claims, characterized in that the interior inductor (4) is centered in the interior (2) of the article (1).
  8. Method according to one of claims 6 or 7, characterized in that the centering /distances is/are determined by the insulation article (7).
  9. Method according to one of claims 5 to 8, characterized in that an insulation article (7) of high-temperature resistant refractory, ceramic fibre material or ceramic foam material is used.
  10. Method according to one of claims 5 to 9, characterized in that the insulation article (7) is pushed onto the interior inductor (4).
  11. Method according to one of claims 5 to 10, characterized in that an insulation article (7) exchangeable at the interior inductor (4) is used.
  12. Method according to one of claims 5 to 11, characterized in that the insulation article (7) and the refractory article (1) or the interior inductor (4), respectively, are easily detached from each other after heating.
  13. Method according to one of claims 5 to 11, characterized in that the insulation material (7) is arranged in the interior (2) of the article (1) at least as its partial lining.
  14. Method according to one of claims 5 to 13, characterized in that the insulation article (7) disintegrates after heating.
  15. Method according to one of claims 1 to 14, characterized in that an article (1) with an outer insulation (11), preferably of ceramic fibre material or ceramic foam material, is used.
EP96110899A 1995-07-25 1996-07-05 Method and apparatus for induction heating of a refractory article Expired - Lifetime EP0755740B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19526967A DE19526967A1 (en) 1995-07-25 1995-07-25 Method and device for inductively heating a refractory molded part
DE19526967 1995-07-25

Publications (2)

Publication Number Publication Date
EP0755740A1 EP0755740A1 (en) 1997-01-29
EP0755740B1 true EP0755740B1 (en) 2002-02-27

Family

ID=7767627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110899A Expired - Lifetime EP0755740B1 (en) 1995-07-25 1996-07-05 Method and apparatus for induction heating of a refractory article

Country Status (8)

Country Link
EP (1) EP0755740B1 (en)
JP (1) JPH09122902A (en)
KR (1) KR970005458A (en)
CN (1) CN1146938A (en)
AT (1) ATE213678T1 (en)
AU (1) AU725323B2 (en)
DE (2) DE19526967A1 (en)
ZA (1) ZA966009B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059744A1 (en) * 2000-12-01 2002-06-06 Km Europa Metal Ag Process for the targeted tempering of a casting trough and casting trough for carrying out the process
CN104962699A (en) * 2015-07-20 2015-10-07 柳州市建西机械铸造厂 Workpiece heat treatment device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1607264A (en) * 1922-02-02 1926-11-16 Budd Wheel Co Method of and means for heating disks or plates electrically
US2227866A (en) * 1938-06-29 1941-01-07 Howard E Somes Protected and insulated heat treatment coil
US2806117A (en) * 1953-12-07 1957-09-10 Westinghouse Electric Corp Inductor apparatus
DE4038061A1 (en) * 1990-11-29 1992-06-04 Didier Werke Ag METHOD FOR PRODUCING CERAMIC SHAPED AND / OR PROFILE BODIES

Also Published As

Publication number Publication date
AU6065096A (en) 1997-01-30
ZA966009B (en) 1997-01-31
DE59608780D1 (en) 2002-04-04
CN1146938A (en) 1997-04-09
DE19526967A1 (en) 1997-02-13
KR970005458A (en) 1997-02-19
ATE213678T1 (en) 2002-03-15
JPH09122902A (en) 1997-05-13
AU725323B2 (en) 2000-10-12
EP0755740A1 (en) 1997-01-29

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