EP0755741B1 - Method and apparatus for induction heating of a refractory article - Google Patents
Method and apparatus for induction heating of a refractory article Download PDFInfo
- Publication number
- EP0755741B1 EP0755741B1 EP96110900A EP96110900A EP0755741B1 EP 0755741 B1 EP0755741 B1 EP 0755741B1 EP 96110900 A EP96110900 A EP 96110900A EP 96110900 A EP96110900 A EP 96110900A EP 0755741 B1 EP0755741 B1 EP 0755741B1
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- Prior art keywords
- interior
- induction coil
- article
- heating
- tube section
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Classifications
-
- 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
-
- 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
- B22D41/005—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
- 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
Definitions
- the invention relates to a method for inductive heating of a refractory molded part that has a tubular interior has, in particular a dip tube.
- Such molded parts are in particular part of a melt outlet device in a metallurgical vessel. you will be preheated to an undesirable cooling of the flowing Avoid melt, especially freezing.
- Fireproof spout moldings are common, especially Immersion spouts, heated by gas burners. This has the disadvantage that it burns out the Carbon comes, which is the material component of the molded part. It is also unfavorable that it heats up when it heats up uneven temperature distribution in the molded part comes. There were, for example, temperature differences of about 400 K. detected. In addition, the heating takes one considerable time.
- DE 38 42 690 A1 is a refractory spout for one Continuous caster shown, the pouring channel outside of one Induction coil is surrounded with the inner outer wall is controlled inductively heated.
- the coil is a component of the pouring component. This is complex and expensive, which is particularly important because such refractories Pour molded parts are wearing parts.
- EP 0 487 924 A3 describes a process for the production of ceramic molded and / or profile bodies for the high temperature range, especially in the case of metallurgical continuous casting plants known in which a ceramic mixture molded and subjected to thermal treatment.
- a ceramic mixture molded and subjected to thermal treatment Around the for the thermal treatment and heating of the Molded and / or profiled body required total effort at the site to reduce the thermal treatment at least partly on site using a heating device carried out by means of the preheating on site the molded and / or profile body is made.
- a heating device carried out by means of the preheating on site.
- the molded and / or profile body is made.
- the thermal treatment and heating can there also by means of a, in particular electrical, heating element the heating device by heat radiation and / or Conduction takes place, the heating element taking the form and / or engages around profile body and / or is inserted into it.
- US-PS 3 435 992 is a molded and / or profile body as a spout for a spout of a metallurgical vessel known. Then the spout is heated up at the place of use, for which an electric heating is provided.
- the spout is electrically conductive can cause heating done inductively by means of an induction coil. It can also capacitive or dielectric heating of the spout be provided. There is also resistance heating possible.
- the object of the invention is a fast, safe and even heating of the refractory molded part possible.
- this object is in a method of type mentioned at the outset with the features of claim 1 solved.
- An outer metal jacket of the molding affects heating up not. Because of the electrical and thermal insulation of the induction coil from the Molded parts are not only electrical short circuits but overheating of the internal inductor also avoided. Through the Invention, increased plant availability is achieved because Freezing problems can be avoided. The procedure is suitable not only for heating while pouring, but also for Heating in the event of interruptions in the casting process around the molded part maintain a suitable temperature.
- an internal inductor When performing the process is called an internal inductor preferably a cooled, predominantly helical induction coil used.
- the figure shows an immersion nozzle for a metallurgical Vessel with an internal inductor used according to the invention.
- An immersion nozzle known per se in its form is a fire-resistant molded part 1 made of a ceramic, carbonaceous material that is inductive to one alternating electric field resulting in heating can be coupled.
- the immersion spout has a tubular, cylindrical interior 2.
- the immersion nozzle is in an outer section with a metallic outer jacket 3 provided.
- the metallic outer jacket 3 shields electromagnetic Fields opposite the immersion spout, so that the immersion spout with an external induction coil is not would be evenly heated.
- the tubular, cylindrical interior 2 an inner inductor 4 inserted.
- the inner inductor 4 has a cooled, helical Induction coil 5, which is connected to a generator 6 is.
- the induction coil 5 is in their Dimensions, in particular the length of the interior 2 adjusted so that they are as possible over the entire length of the Interior 2 extends. In addition, their diameter is on the Adjusted the diameter of the interior 2.
- the surface of the interior 2 is opposite the induction coil 5 with a layer 13, for example a ceramic glaze, electrically and thermally insulated so that the immersion spout not in contact with live parts comes and / or there is no zonal overheating.
- a layer 13 for example a ceramic glaze, electrically and thermally insulated so that the immersion spout not in contact with live parts comes and / or there is no zonal overheating.
- the outer surface of the induction coil 5 is by means of a Pipe section 7 opposite the surface of the interior 2 electrically and thermally insulated.
- the induction coil 5 different Adapt geometries or wall thicknesses in such a way that different distances between the induction coil 5 and the Surfaces of the areas to be heated exist.
- This Measure different energy densities in the measure Molding 1 produces what the uniformity of heating different wall thicknesses improved.
- the pipe section 7 is to be designed accordingly.
- the pipe section 7 also serves to center the induction coil 5 in the interior 2.
- the pipe section 7 is on the Induction coil 5 frictionally pushed on, so that it is in Is exchangeable if necessary.
- the outside diameter of the Pipe section 7 is so on the inside diameter of the interior 2 adapted that he easily with the induction coil 5 in the Interior 2 can be pushed in and pulled out of interior 2 is.
- the design can also be such that first the pipe section 7 into the interior 2 and then the Induction coil 5 is inserted into the tube section 7.
- the pipe section 7 has at the top to limit insertion a flange 8. In the embodiment, it is below closed by a bottom 9.
- the immersion spout also in its extended head area 10 to heat, the induction coil 5 is above Flange 8 provided with an additional turn 11.
- the pipe section 7 consists of a highly heat-resistant, ceramic fiber or foam material.
- the pipe section 7 or the pipe sections do not have to the interior 2 can be pulled out. It is also possible that Pipe section 7 or the pipe sections as the lining of the To design interior 2, which then at the first Use by the melt is decomposed.
- the Inner inductor 4 with its tube section 7 in the interior 2 inserted and the generator 6 is switched on. Thereby the immersion spout is essentially over its entire length Length quickly and evenly inductively heated.
- the internal inductor 4 is reached from the Immersion spout pulled out. This is then preheated ready for casting.
- the inner inductor 4 can be used for use many heating processes on many immersion spouts. Its possible use is therefore due to the wear of the Immersion spout independent.
- the pipe section 7 can be if it is worn, pull it off the induction coil 5 and replace with a new pipe section. With different Inner diameters of immersion spouts Pipe sections 7 with correspondingly different outside diameters be kept ready. It is possible the induction coil 5 even with different interior diameters insert each coaxially centered.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Heat Treatment Of Articles (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Forging (AREA)
- Furnace Details (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum induktiven Aufheizen eines feuerfesten Formteils, das einen rohrförmigen Innenraum aufweist, insbesondere eines Tauchgießrohres.The invention relates to a method for inductive heating of a refractory molded part that has a tubular interior has, in particular a dip tube.
Solche Formteile sind insbesondere Teil einer Schmelzenauslassvorrichtung 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 in a metallurgical vessel. you will be preheated to an undesirable cooling of the flowing Avoid melt, especially freezing.
Üblicherweise werden feuerfeste Ausguss-Formteile, insbesondere Eintauchausgüsse, mittels Gasbrennern aufgeheizt. Dies hat den Nachteil, dass es dabei zu einem Ausbrennen des Kohlenstoffs kommt, der Materialbestandteil des Formteils ist. Ungünstig ist dabei außerdem, dass es beim Aufheizen zu einer ungleichmäßigen Temperaturverteilung in dem Formteil kommt. Es wurden bspw. Temperaturunterschiede von etwa 400 K festgestellt. Darüber hinaus nimmt das Aufheizen eine beträchtliche Zeit in Anspruch.Fireproof spout moldings are common, especially Immersion spouts, heated by gas burners. This has the disadvantage that it burns out the Carbon comes, which is the material component of the molded part. It is also unfavorable that it heats up when it heats up uneven temperature distribution in the molded part comes. There were, for example, temperature differences of about 400 K. detected. In addition, the heating takes one considerable time.
In der DE 38 42 690 A1 ist ein feuerfester Ausguss für eine Stranggießanlage gezeigt, dessen Ausgusskanal außen von einer Induktionsspule umgeben ist, mit der die innere Außenwand geregelt induktiv aufheizbar ist. Die Spule ist Bestandteil des Ausgussbauteils. Dieses ist dadurch aufwendig und teuer, was insbesondere ins Gewicht fällt, weil solche feuerfesten Ausguss-Formteile Verschleißteile sind. DE 38 42 690 A1 is a refractory spout for one Continuous caster shown, the pouring channel outside of one Induction coil is surrounded with the inner outer wall is controlled inductively heated. The coil is a component of the pouring component. This is complex and expensive, which is particularly important because such refractories Pour molded parts are wearing parts.
Aus der EP 0 487 924 A3 ist ein Verfahren zur Herstellung von
keramischen Form- und/oder Profilkörpern für den Hochtemperaturbereich,
insbesondere bei metallurgischen Stranggießanlagen
bekannt, bei welchem eine keramische Mischung
geformt und einer thermischen Behandlung unterworfen wird. Um
den für die thermische Behandlung und eine Aufheizung des
Form- und/oder Profilkörpers am Einsatzort nötigen Gesamtaufwand
zu verringern, wird die thermische Behandlung zumindest
teilweise am Einsatzort mittels einer Aufheizvorrichtung
durchgeführt, mittels der am Einsatzort auch die Vorheizung
des Form- und/oder Profilkörpers vorgenommen wird. Hierzu kann
bspw. ein Induktor verwendet werden, in welchen der Formkörper
eingesetzt wird. Die thermische Behandlung und Aufheizung kann
dort auch mittels eines, insbesondere elektrischen, Heizelements
der Aufheizvorrichtung durch Wärmestrahlung und/oder
Wärmeleitung erfolgen, wobei das Heizelement den Form-
und/oder Profilkörper umgreift und/oder in ihn eingesetzt ist.
Aus der US-PS 3 435 992 ist ein Form- und/oder Profilkörper als Tülle für einen Ausguss eines metallurischen Gefäßes bekannt. Danach wird am Einsatzort der Ausguss aufgeheizt, wofür eine elektrische Beheizung vorgesehen ist. Für den Fall, dass der Ausguss elektrisch leitfähig ist, kann die Erwärmung mittels einer Induktionsspule induktiv erfolgen. Es kann auch eine kapazitive bzw. dielektrische Beheizung des Ausgusses vorgesehen sein. Außerdem ist auch eine Widerstandsbeheizung möglich.From US-PS 3 435 992 is a molded and / or profile body as a spout for a spout of a metallurgical vessel known. Then the spout is heated up at the place of use, for which an electric heating is provided. In the case, that the spout is electrically conductive can cause heating done inductively by means of an induction coil. It can also capacitive or dielectric heating of the spout be provided. There is also resistance heating possible.
Aus der US-PS 1 607 264, der US-PS 2 227 866 und der US-PS 2 806 117 ist es an sich bekannt, Formteile, welche einen kanalförmigen Innenraum aufweisen, induktiv aufzuheizen, wobei in den Innenraum ein Inneninduktor eingebracht wird. From US-PS 1 607 264, US-PS 2 227 866 and US-PS 2 806 117 it is known per se, molded parts, which have a channel-shaped interior to be heated inductively, an inner inductor being introduced into the interior.
Aufgabe der Erfindung ist es, ein rasches, sicheres und gleichmäßiges Aufheizen des feuerfesten Formteils zu er möglichen.The object of the invention is a fast, safe and even heating of the refractory molded part possible.
Erfindungsgemäß ist diese Aufgabe bei einem Verfahren der eingangs genannten Art mit den Merkmalen des Anspruchs 1 gelöst.According to the invention, this object is in a method of type mentioned at the outset with the features of claim 1 solved.
Dabei erfolgt ein rasches und gleichmäßiges Aufheizen des feuerfesten Bauteils, das bspw. ein Eintauchausguss oder ein Rohr eines Rohr-in-Rohr-Auslasssystems ist, mit dem der Schmelzenausfluss unterbrechbar und/oder steuerbar bzw. regelbar ist. Ein äußerer Metallmantel des Formteils beeinträchtigt die Aufheizung nicht. Aufgrund der elektrischen und thermischen Isolierung der Induktionsspule gegenüber dem Formteil werden nicht nur elektrische Kurzschlüssse sondern auch eine Überhitzung des Inneninduktors vermieden. Durch die Erfindung ist eine erhöhte Anlagenverfügbarkeit erreicht, weil 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. This is a quick and even heating of the refractory component, for example an immersion nozzle or a Pipe of a pipe-in-pipe outlet system with which the Melt outflow interruptible and / or controllable or is adjustable. An outer metal jacket of the molding affects heating up not. Because of the electrical and thermal insulation of the induction coil from the Molded parts are not only electrical short circuits but overheating of the internal inductor also avoided. Through the Invention, increased plant availability is achieved because Freezing problems can be avoided. The procedure is suitable not only for heating while pouring, but also for Heating in the event of interruptions in the casting process around the molded part maintain a suitable temperature.
Bei der Durchführung des Verfahrens wird als Inneninduktor vorzugsweise eine gekühlte, vorwiegend wendelförmige Induktionsspule verwendet.When performing the process is called an internal inductor preferably a cooled, predominantly helical induction coil used.
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 einen Eintauchausguss für ein metallurgisches Gefäß mit einem erfindungegemäß eingesetzten Inneninduktor.The figure shows an immersion nozzle for a metallurgical Vessel with an internal inductor used according to the invention.
Ein in seiner Form an sich bekannter Eintauchausguss (Tauchgießrohr) ist ein feuerfestes Formteil 1 aus einem keramischen, kohlenstoffhaltigen Material, das induktiv an ein elektrisches Wechselfeld mit der Folge einer Aufheizung ankoppelbar ist. Der Eintauchausguss weist einen rohrförmigen, zylindrischen Innenraum 2 auf. Der Eintauchausguss ist in einem äußeren Teilbereich mit einem metallischen Außenmantel 3 versehen. Der metallische Außenmantel 3 schirmt elektromagnetische Felder gegenüber dem Eintauchausguss ab, so dass der Eintauchausguss mit einer äußeren Induktionsspule nicht gleichmäßig aufheizbar wäre.An immersion nozzle known per se in its form (immersion nozzle) is a fire-resistant molded part 1 made of a ceramic, carbonaceous material that is inductive to one alternating electric field resulting in heating can be coupled. The immersion spout has a tubular, cylindrical interior 2. The immersion nozzle is in an outer section with a metallic outer jacket 3 provided. The metallic outer jacket 3 shields electromagnetic Fields opposite the immersion spout, so that the immersion spout with an external induction coil is not would be evenly heated.
In dem in der Figur dargestellten Zustand ist in den rohrförmigen,
zylindrischen Innenraum 2 ein Inneninduktor 4 eingeschoben.
Der Inneninduktor 4 weist eine gekühlte, wendelförmige
Induktionsspule 5 auf, die an einen Generator 6 angeschlossen
ist. Die Induktionsspule 5 ist dabei in ihren
Abmessungen, insbesondere in ihrer Länge dem Innenraum 2 so
angepasst, dass sie sich möglichst über die gesamte Länge des
Innenraums 2 erstreckt. Außerdem ist ihr Durchmesser an den
Durchmesser des Innenraumes 2 angepasst. In the state shown in the figure, the tubular,
cylindrical interior 2, an inner inductor 4 inserted.
The inner inductor 4 has a cooled, helical
Induction coil 5, which is connected to a
Die Oberfläche des Innenraums 2 ist gegenüber der Induktionsspule 5 mit einer Schicht 13, bspw. einer keramischen Glasur, elektrisch und thermisch isoliert, damit der Eintauchausguss nicht mit elektrische Spannung führenden Teilen in Berührung kommt und/oder keine zonale Überhitzung erfolgt.The surface of the interior 2 is opposite the induction coil 5 with a layer 13, for example a ceramic glaze, electrically and thermally insulated so that the immersion spout not in contact with live parts comes and / or there is no zonal overheating.
Die Außenfläche der Induktionsspule 5 ist mittels eines Rohrabschnitts 7 gegenüber der Oberfläche des Innenraumes 2 elektrisch und thermisch isoliert.The outer surface of the induction coil 5 is by means of a Pipe section 7 opposite the surface of the interior 2 electrically and thermally insulated.
Vorteilhaft ist auch, die Induktionsspule 5 unterschiedlichen Geometrien oder Wandstärken dergestalt anzupassen, dass verschiedene Abstände zwischen der Induktionsspule 5 und den Oberflächen der aufzuheizenden Bereiche bestehen. Mit dieser Maßnahme werden unterschiedliche Energiedichten in dem Formteil 1 erzeugt, was die Gleichmäßigkeit der Aufheizung bei unterschiedlichen Wandstärken verbessert. Der Rohrabschnitt 7 ist entsprechend zu gestalten.It is also advantageous that the induction coil 5 different Adapt geometries or wall thicknesses in such a way that different distances between the induction coil 5 and the Surfaces of the areas to be heated exist. With this Measure different energy densities in the measure Molding 1 produces what the uniformity of heating different wall thicknesses improved. The pipe section 7 is to be designed accordingly.
Der Rohrabschnitt 7 dient auch der Zentrierung des Induktionsspule 5 im Innenraum 2. Der Rohrabschnitt 7 ist auf die Induktionsspule 5 reibschlüssig aufgeschoben, so dass er im Bedarfsfall auswechselbar ist. Der Außendurchmesser des Rohrabschnitts 7 ist so an den Innendurchmesser des Innenraums 2 angepasst, dass er mit der Induktionsspule 5 leicht in den Innenraum 2 einschiebbar und aus dem Innenraum 2 herausziehbar ist. Die Gestaltung kann jedoch auch so getroffen sein, dass zunächst der Rohrabschnitt 7 in den Innenraum 2 und dann die Induktionsspule 5 in den Rohrabschnitt 7 einzuschieben ist. The pipe section 7 also serves to center the induction coil 5 in the interior 2. The pipe section 7 is on the Induction coil 5 frictionally pushed on, so that it is in Is exchangeable if necessary. The outside diameter of the Pipe section 7 is so on the inside diameter of the interior 2 adapted that he easily with the induction coil 5 in the Interior 2 can be pushed in and pulled out of interior 2 is. However, the design can also be such that first the pipe section 7 into the interior 2 and then the Induction coil 5 is inserted into the tube section 7.
Der Rohrabschnitt 7 weist oben zur Begrenzung des Einschiebens
einen Flansch 8 auf. In dem Ausführungsbeispiel ist er unten
durch einen Boden 9 verschlossen.The pipe section 7 has at the top to limit insertion
a
Um den Eintauchausguss auch in seinem erweiterten Kopfbereich
10 aufzuheizen, ist die Induktionsspule 5 oberhalb des
Flansches 8 mit einer zusätzlichen Windung 11 versehen.The immersion spout also in its
Der Rohrabschnitt 7 besteht aus einem hochhitzebeständigen, keramischen Faser- oder Schaummaterial.The pipe section 7 consists of a highly heat-resistant, ceramic fiber or foam material.
Es ist nicht notwendig, dass der Rohrabschnitt 7 sich über die gesamte Länge der Induktionsspule 5 erstreckt. Es können auch zwei oder mehrere Rohrabschnitte in der Länge der Induktionsspule 5 verteilt vorgesehen sein.It is not necessary that the pipe section 7 extends over the entire length of the induction coil 5 extends. It can too two or more pipe sections in the length of the induction coil 5 distributed.
Der Rohrabschnitt 7 bzw. die Rohrabschnitte müssen nicht aus dem Innenraum 2 herausziehbar sein. Es ist auch möglich, den Rohrabschnitt 7 bzw. die Rohrabschnitte als Auskleidung des Innenraums 2 zu gestalten, welche dann bei der ersten Verwendung durch die Schmelze zersetzt wird.The pipe section 7 or the pipe sections do not have to the interior 2 can be pulled out. It is also possible that Pipe section 7 or the pipe sections as the lining of the To design interior 2, which then at the first Use by the melt is decomposed.
Um zu vermeiden, dass der Eintauchausguss beim Aufheizen Wärme
nach außen abstrahlt, d.h. verliert, kann er mit einer
Außenisolierung 12, vorzugsweise aus keramischem Fasermaterial
oder keramischem Schaum versehen sein. Dies verbessert die
rasche und gleichmäßige Aufheizung des Eintauchausgusses. To avoid the immersion spout from heating when heating
radiates to the outside, i.e. loses, he can with one
Soll der Eintauchausguss aufgeheizt werden, dann wird der
Inneninduktor 4 mit seinem Rohrabschnitt 7 in den Innenraum
2 eingeschoben und der Generator 6 wird eingeschaltet. Dadurch
wird der Eintauchausguss im Wesentlichen über seine gesamte
Länge rasch und gleichmäßig induktiv aufgeheizt. Nach
Erreichen der Solltemperatur wird der Inneninduktor 4 aus dem
Eintauchausguss herausgezogen. Dieser steht dann vorgeheizt
für den Gießbetrieb bereit. Der Inneninduktor 4 lässt sich für
viele Aufheizvorgänge an vielen Eintauchausgüssen verwenden.
Seine Einsatzmöglichkeit ist dadurch vom Verschleiß des
Eintauchausgusses unabhängig. Der Rohrabschnitt 7 lässt sich,
wenn er verschlissen ist, von der Induktionsspule 5 abziehen
und durch einen neuen Rohrabschnitt ersetzen. Bei unterschiedlichen
Innendurchmessern von Eintauchausgüssen können
Rohrabschnitte 7 mit entsprechend unterschiedlichen Außendurchmessern
bereitgehalten werden. Es ist dadurch möglich,
die Induktionsspule 5 auch bei unterschiedlichen Innenraumdurchmessern
jeweils koaxial zentriert einzuschieben.If the immersion spout is to be heated, then the
Inner inductor 4 with its tube section 7 in the interior
2 inserted and the
Claims (13)
- Method for induction heating of a refractory article comprising a tube-shaped interior, and where an interior inductor (4) is introduced in the inner space (2), characterized in that between the interior inductor (4) and the article (1) an electrically and thermically insulating layer (13) and/or at least an electrically or thermically insulating tube section (7) are provided, that by means of the interior inductor (4) the article (1) is heated up and that thereafter the interior inductor (4) is taken out of the interior (2).
- Method according to claim 1, characterized in that the article (1) is a refractory pouring spout.
- Method according to claim 2, characterized in that as the interior inductor (4) a cooled, predominantly spiral induction coil (5) is used.
- Method according to claim 2 or 3, characterized in that the dimensions of the induction coil (5) are adapted to the dimensions of the interior (2) of the refractory article (1).
- Method according to one of claims 1 to 4, characterized in that the distance of the induction coil (5) from the surfaces of the regions of the refractory article (1) to be heated up is adapted so that different amounts of energy are transmitted.
- Method according to one of claims 1 to 5, characterized in that the induction coil (5) is centered in the inner space the article (1).
- Method according to claim 6, characterized in that for the centering serves at least one tube section (7), which inculdes the induction coil (5) and centrically aligns within the inner space (2) of the article (1).
- Method according to one of claims 1 to 7, characterized in that the at least one tube section (7) is slid onto the induction coil (5).
- Method according to one of claims 1 to 8, characterized in that the at least one tube section (7) at the induction coil (5) is exchangeable.
- Method according to one of claims 1 to 9, characterized in that the at least one tube section (7) consists of a highly refractory, ceramic fibre material or ceramic foam material.
- Method according to one of claims 1 to 10, characterized in that the at least one tube section (7) is arranged as at least partial lining of the interior (2).
- Method according to claim 11, characterized in that the lining is decomposed after heating.
- Method according to one of claims 1 to 12, characterized in that the article (1) is provided with an outer insulation (12), preferably of ceramic fibre material or ceramic foam material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19526970 | 1995-07-25 | ||
| DE19526970A DE19526970C2 (en) | 1995-07-25 | 1995-07-25 | Process for induction heating of a refractory molded part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0755741A1 EP0755741A1 (en) | 1997-01-29 |
| EP0755741B1 true EP0755741B1 (en) | 2001-11-21 |
Family
ID=7767630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96110900A Expired - Lifetime EP0755741B1 (en) | 1995-07-25 | 1996-07-05 | Method and apparatus for induction heating of a refractory article |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0755741B1 (en) |
| JP (1) | JPH09122901A (en) |
| KR (1) | KR970005459A (en) |
| CN (1) | CN1146939A (en) |
| AT (1) | ATE209075T1 (en) |
| AU (1) | AU724697B2 (en) |
| DE (2) | DE19526970C2 (en) |
| ZA (1) | ZA966008B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19900915A1 (en) | 1999-01-13 | 2000-07-20 | Schloemann Siemag Ag | Method and device for setting and / or maintaining the temperature of a melt, preferably a steel melt during continuous casting |
| KR100681115B1 (en) * | 1999-11-24 | 2007-02-08 | 주식회사 케이티 | Method for improvement graphic processing in communication system |
| DE10035097A1 (en) * | 2000-07-17 | 2002-02-07 | Didier Werke Ag | Immersion heating element used for changing, maintaining and/or comparing the bath temperature of a molten metal comprises an inner inductor arranged in a refractory casing having a flat cross-section and closed on its base |
| DE10204305B4 (en) * | 2002-02-01 | 2004-04-29 | Heraeus Electro-Nite International N.V. | Refractory spout for a metallurgical vessel |
| JP4660343B2 (en) * | 2004-11-24 | 2011-03-30 | 新日本製鐵株式会社 | Nozzle heating device for molten metal injection |
| JP4482549B2 (en) * | 2006-11-28 | 2010-06-16 | 新日本製鐵株式会社 | Induction heating device |
| KR101412539B1 (en) * | 2012-05-31 | 2014-07-01 | 현대제철 주식회사 | Device for preheating mold |
| CN106077598A (en) * | 2016-04-26 | 2016-11-09 | 重庆大学 | A kind of bath temperature adjusting means of aluminium alloy melt insulated pouring room |
| CN107520437A (en) * | 2016-06-21 | 2017-12-29 | 宝山钢铁股份有限公司 | A kind of temperature compensation means and its method of ladle long nozzle low overheat |
| JP7222262B2 (en) * | 2019-02-13 | 2023-02-15 | 日本製鉄株式会社 | Protective Refractory for Induction Heating Coil and Electromagnetic Induction Heating Method |
| JP7234768B2 (en) * | 2019-04-16 | 2023-03-08 | 日本製鉄株式会社 | Preheating method of immersion nozzle |
| JP2020179412A (en) * | 2019-04-25 | 2020-11-05 | 日本製鉄株式会社 | Induction heater for immersion nozzle and method of pre-heating immersion nozzle |
Family Cites Families (6)
| 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 |
| DE3842690C2 (en) * | 1988-12-19 | 1998-04-30 | Didier Werke Ag | Refractory connection and induction coil therefor |
| DE4038061A1 (en) * | 1990-11-29 | 1992-06-04 | Didier Werke Ag | METHOD FOR PRODUCING CERAMIC SHAPED AND / OR PROFILE BODIES |
| US5523546A (en) * | 1995-05-09 | 1996-06-04 | Mannings, U.S.A., Inc. | Apparatus and method of inductively heating a workpiece with a slender bone |
-
1995
- 1995-07-25 DE DE19526970A patent/DE19526970C2/en not_active Expired - Fee Related
-
1996
- 1996-07-05 AT AT96110900T patent/ATE209075T1/en not_active IP Right Cessation
- 1996-07-05 EP EP96110900A patent/EP0755741B1/en not_active Expired - Lifetime
- 1996-07-05 DE DE59608239T patent/DE59608239D1/en not_active Expired - Fee Related
- 1996-07-09 JP JP8211824A patent/JPH09122901A/en active Pending
- 1996-07-15 ZA ZA966008A patent/ZA966008B/en unknown
- 1996-07-15 KR KR1019960028515A patent/KR970005459A/en not_active Application Discontinuation
- 1996-07-22 CN CN96109933A patent/CN1146939A/en active Pending
- 1996-07-23 AU AU60649/96A patent/AU724697B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AU6064996A (en) | 1997-01-30 |
| DE59608239D1 (en) | 2002-01-03 |
| KR970005459A (en) | 1997-02-19 |
| ZA966008B (en) | 1997-01-31 |
| DE19526970C2 (en) | 2000-11-16 |
| AU724697B2 (en) | 2000-09-28 |
| ATE209075T1 (en) | 2001-12-15 |
| DE19526970A1 (en) | 1997-01-30 |
| EP0755741A1 (en) | 1997-01-29 |
| JPH09122901A (en) | 1997-05-13 |
| CN1146939A (en) | 1997-04-09 |
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