EP0755740A1 - Procédé et dispositif de chauffage par induction d'une pièce réfractaire - Google Patents

Procédé et dispositif de chauffage par induction d'une pièce réfractaire Download PDF

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Publication number
EP0755740A1
EP0755740A1 EP96110899A EP96110899A EP0755740A1 EP 0755740 A1 EP0755740 A1 EP 0755740A1 EP 96110899 A EP96110899 A EP 96110899A EP 96110899 A EP96110899 A EP 96110899A EP 0755740 A1 EP0755740 A1 EP 0755740A1
Authority
EP
European Patent Office
Prior art keywords
molded part
interior
insulation
inductor
inner inductor
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
EP96110899A
Other languages
German (de)
English (en)
Other versions
EP0755740B1 (fr
Inventor
Raimund Brückner
Rüdiger Dr. Grau
Daniel Grimm
Steve Lee
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 EP0755740A1 publication Critical patent/EP0755740A1/fr
Application granted granted Critical
Publication of EP0755740B1 publication Critical patent/EP0755740B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 inductively heating a refractory molded part which has a channel-shaped interior. Furthermore, the invention relates to a device for performing the method.
  • Such molded parts are in particular part of a melt outlet device or melt feed device in a metallurgical vessel. They are preheated in order to prevent the melt flowing through it from cooling down, in particular freezing it.
  • DE 38 42 690 A1 shows a refractory spout for a continuous caster.
  • the spout is surrounded on the outside by an induction coil with which the inner outer wall can be heated inductively in a controlled manner.
  • the coil is part of the pouring component. This is complex and expensive, which is particularly important because such refractory pouring parts are wearing parts.
  • Fireproof pouring moldings are usually heated by means of gas burners. This has the disadvantage that it can burn out the carbon, which is a material component of the molded part. It is also unfavorable that there is an uneven temperature distribution in the molded part during heating. For example, temperature differences of about 400 K were observed. It also takes a considerable amount of time to heat up.
  • the object of the invention is to enable rapid and uniform heating of the refractory molded part.
  • the above object is achieved in a method of the type mentioned in the introduction that an internal inductor is introduced into the interior of the refractory molded part, that the molded part is heated by means of the internal inductor and then the internal inductor is removed from the internal space.
  • the refractory molded part is heated up rapidly and uniformly, which is, for example, a feed and metering system for a belt or twin roll caster, with which the melt outflow can be interrupted and / or controlled or regulated.
  • the invention achieves increased plant availability because freezing problems are avoided.
  • the method and the device are suitable not only for heating during casting, but also for heating during interruptions in casting in order to keep the molded part at a suitable temperature.
  • a device for performing the method is characterized in that the internal inductor is formed from one or more cooled induction coils.
  • the figure shows a fireproof molded part as a feed channel for a twin-roll caster with an internal inductor inserted.
  • a feed channel which is known in its form, is a refractory molded part (1) made of a ceramic, carbon-containing material, which can be inductively coupled to an alternating electrical field, which results in heating.
  • the feed channel has a channel-shaped interior (2) with a rectangular cross section.
  • the supply duct is provided in an outer partial area with a metallic outer jacket (3), as is often used when using so-called ETA changers.
  • the metallic outer jacket (3) therefore shields electromagnetic fields from the supply channel, so that the supply channel could not be heated uniformly with an external induction coil.
  • an inner inductor (4) is inserted into the interior (2) with a rectangular cross section.
  • the dimensions of the inner inductor (4), in particular its length, are adapted to the interior (2) so that it extends as far as possible over the entire length of the interior (2).
  • its outer geometry is adapted to the dimensions of the interior (2).
  • the internal inductor (4) has a number of cooled induction coils (5) which are connected to a generator (6).
  • the interior (2) is elastically and / or thermally insulated from the inner inductor (4) with a layer (12), for example a ceramic glaze, so that the refractory molded part (1) does not come into contact with parts carrying electrical voltage and / or no zonal overheating occurs.
  • the outer surface of the inner inductor (4) is electrically and / or thermally insulated from the surfaces of the inner space (2) by means of an insulation molding (7).
  • the inner inductor (4) is also advantageous to adapt the inner inductor (4) to different geometries or wall thicknesses such that there are different distances between the inner inductor (4) and the surfaces of the areas to be heated. With this measure, different energy densities are generated in the molded part (1), which improves the uniformity of the heating with different wall thicknesses.
  • 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 slid onto the induction coil (5) so that it can be replaced if necessary.
  • the outer geometry of the molded insulation part (7) is adapted to the interior (2) in such a way that it can be easily inserted into the interior (2) and pulled out of the interior (2) with the interior inductor (4).
  • the design can also be such that first the molded insulation part (7) is inserted into the interior (2) and then the internal inductor (4) into the molded insulation part (7).
  • the molded insulation part (7) has a flange (8) at the top to limit insertion. It's open below. In other applications, e.g. in the case of supply ducts with lateral outflow openings, the insulation molded part (7) can be closed by means of a base.
  • the inner inductor (4) is provided with an additional turn (10) above the flange (8).
  • the molded insulation part (7) consists of a highly heat-resistant, ceramic fiber material or ceramic foam material.
  • molded insulation part (7) it is not necessary for the molded insulation part (7) to extend over the entire length of the internal inductor (4). Two or more molded insulation parts can also be provided distributed.
  • the molded insulation part (7) or the molded insulation parts need not be able to be pulled out of the interior (2). It is also possible to design the molded insulation part (7) or the molded insulation parts as the lining of the interior (2).
  • the supply duct radiates heat to the outside, ie loses heat
  • external insulation preferably made of ceramic fiber material or ceramic foam material. This improves the rapid and even heating of the feed channel.
  • the internal inductor (4) with the molded insulation part (7) is inserted into the interior (2) and the generator (6) is switched on.
  • the feed channel is inductively heated rapidly and uniformly over its entire cross section.
  • the internal inductor (4) is pulled out of the supply duct. This is then pre-heated and ready for the casting operation.
  • the inner inductor (4) can be used for many heating processes on many supply channels. Its use is therefore independent of the wear of the feed channel.
  • the insulation molded part (7), if it is worn, can be pulled off the inner inductor (4) and replaced by a new insulation molded part. In the case of different cross sections of supply channels, molded insulation parts (7) with correspondingly different dimensions can be kept ready. This makes it possible to insert the inner inductor (4) in a centered manner even with different interior geometries.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Forging (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP96110899A 1995-07-25 1996-07-05 Procédé et dispositif de chauffage par induction d'une pièce réfractaire Expired - Lifetime EP0755740B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19526967A DE19526967A1 (de) 1995-07-25 1995-07-25 Verfahren und Vorrichtung zum induktiven Aufheizen eines feuerfesten Formteils
DE19526967 1995-07-25

Publications (2)

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

Family

ID=7767627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110899A Expired - Lifetime EP0755740B1 (fr) 1995-07-25 1996-07-05 Procédé et dispositif de chauffage par induction d'une pièce réfractaire

Country Status (8)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1211002A1 (fr) * 2000-12-01 2002-06-05 KM Europa Metal Aktiengesellschaft Procédé pour l'équilibrage de température d'un récipient intermédiaire et récipient intermédiaire destiné à mettre en oeuvre ce procédé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104962699A (zh) * 2015-07-20 2015-10-07 柳州市建西机械铸造厂 工件热处理装置

Citations (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
EP0487924A2 (fr) * 1990-11-29 1992-06-03 Didier-Werke Ag Procédé de fabrication d'objets céramiques façonnés et/ou profilés

Patent Citations (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
EP0487924A2 (fr) * 1990-11-29 1992-06-03 Didier-Werke Ag Procédé de fabrication d'objets céramiques façonnés et/ou profilés

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1211002A1 (fr) * 2000-12-01 2002-06-05 KM Europa Metal Aktiengesellschaft Procédé pour l'équilibrage de température d'un récipient intermédiaire et récipient intermédiaire destiné à mettre en oeuvre ce procédé
KR100738857B1 (ko) * 2000-12-01 2007-07-16 카엠 오이로파 메탈 악티엔 게젤샤프트 용탕 주입 홈통을 목표의 온도로 조절하는 방법 및 그방법을 행하기 위한 용탕 주입 홈통

Also Published As

Publication number Publication date
CN1146938A (zh) 1997-04-09
DE59608780D1 (de) 2002-04-04
AU725323B2 (en) 2000-10-12
KR970005458A (ko) 1997-02-19
ATE213678T1 (de) 2002-03-15
EP0755740B1 (fr) 2002-02-27
JPH09122902A (ja) 1997-05-13
ZA966009B (en) 1997-01-31
DE19526967A1 (de) 1997-02-13
AU6065096A (en) 1997-01-30

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