EP0771239B1 - Procede de chauffage par induction d'une piece moulee refractaire et piece moulee appropriee - Google Patents

Procede de chauffage par induction d'une piece moulee refractaire et piece moulee appropriee Download PDF

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Publication number
EP0771239B1
EP0771239B1 EP96914880A EP96914880A EP0771239B1 EP 0771239 B1 EP0771239 B1 EP 0771239B1 EP 96914880 A EP96914880 A EP 96914880A EP 96914880 A EP96914880 A EP 96914880A EP 0771239 B1 EP0771239 B1 EP 0771239B1
Authority
EP
European Patent Office
Prior art keywords
shaped member
electrically insulating
molten metal
electrically conductive
conductive layer
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.)
Expired - Lifetime
Application number
EP96914880A
Other languages
German (de)
English (en)
Other versions
EP0771239A1 (fr
Inventor
Raimund Brückner
Rüdiger GRAU
Daniel Grimm
Seyed Masoud Hashemi
Karl-Heinz Spitzer
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 EP0771239A1 publication Critical patent/EP0771239A1/fr
Application granted granted Critical
Publication of EP0771239B1 publication Critical patent/EP0771239B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • 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
    • 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
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0671—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for heating or drying

Definitions

  • the invention relates to an inductively heatable refractory Molding.
  • Such a molded part is in EP-A-0 503 237 described.
  • This molding consists of shells, from which at least one can be heated inductively.
  • the outer Shell has a slot. Measures for inductive Heating from outside in the longitudinal direction of the molding Areas of the inductor are not provided.
  • FR-A-2 670 697 there is an inductively heatable duct with several slits in the longitudinal direction described.
  • the inductor extends over the entire length of the duct to be heated.
  • EP-A-0 593 383 there is a twin roll caster with boundary plates shown by special inductors are heated.
  • From US-A-5 198 017 is an inductively heatable Pourer known for a melt vessel.
  • the pouring spout carries several longitudinal tubes.
  • From US-PS 3 435 992 is a pouring sleeve for the continuous pouring of liquid metal, in particular Steel, known which, before contacting the liquid metal is heated inductively.
  • the in the U.S. Pat. No. 3,435,992 has a pouring sleeve electrically conductive insert in the one essentially non-electrically conductive refractory material molded pouring sleeve.
  • the electrically conductive Insert which preferably consists of a graphite part, by a current of suitable frequency in the range of 3 to 50 kHz can be heated.
  • the electrically conductive use induction energy on and heats up the heat generated by heat conduction to the actual, from the non-electrically conductive Refractory material formed pouring sleeve is transferred.
  • FR 2 609 914 A1 shows a pouring sleeve, the The outer part can be heated inductively. Are in the outer part several pipes forming the pouring opening are used. Here, too, is generated by the induction energy Heat through heat conduction on the actual pouring opening forming pipes.
  • a disadvantage of the prior art shown here is that the induction heat is not direct, but only by heat conduction on the entire refractory part is transmitted. This is especially the case Case when the molded part is not completely removed from the inductor device is enclosed, but from this more or less "protrudes”. Often this is not too avoid, because of space or construction reasons none other solution is possible. In such a case it will fireproof molding heated very unevenly, which too Stress cracks, etc.
  • the molding according to the invention is quick and uniform inductively heatable, also in the area of electromagnetic Subfields.
  • the inductor device can thus in an uncritical and constructively favorable area of the molded part can be placed and still the complete Molding be heated evenly inductively.
  • the molded part a ceramic immersion pouring tube for the introduction of Metal melt, in a melt sump, especially in a mold for the production of thin slabs or strips.
  • the immersion nozzle extends into the mold and dives, if the mold after casting with molten metal is filled with its lower area in the mold powder covered metal swamp.
  • the dip tube also in the area surrounded by the mold, the existing ones in particular with thin slabs and immersion pipes Risk of bridging between the immersion pouring tube and the mold wall avoided.
  • the mold powder can be melted in a targeted manner be, which means the reproducibility of this process or the quality of the product produced is improved. Likewise, the danger of Cloggings reduced.
  • the molded part is a ceramic feed channel for the application of molten metal on a Conveyor belt.
  • a molded part according to the invention which in particular for the introduction or Giving up molten metal essentially has the following features:
  • the molded part consisting of an electrically conductive layer is in Longitudinal direction with a continuous, uninterrupted, electrical insulated longitudinal slot.
  • This electrically insulating longitudinal slot is advantageously with an electrically insulating, refractory ceramic Material filled out.
  • the interior area enclosed by the molded part, through which the molten metal is introduced or abandoned is with one of the Molten metal facing, electrically insulating, refractory ceramic Provide inner layer.
  • the remaining areas of the molded part, which are in use either immerse in the melt sump or when giving up the Metal melt on a cooled conveyor belt with the metal melt in Contact are made with an electrically insulating, refractory ceramic Layer.
  • a molded part according to the invention has another in an intermediate region electrically insulating longitudinal slot.
  • This longitudinal slot connects at least two in this intermediate area almost all over Circumference of the molded part, deflecting the electromagnetic field, electrically insulating cross slots.
  • the molded part is in Longitudinal direction divided by an electrically insulated partition.
  • This Partition can be in the continuous, electrically insulating longitudinal slot and the electrically insulating longitudinal slot or slots in the intermediate area be anchored.
  • This partition can also be used as a flow divider, for example be formed in a dip tube or serve the mechanical To increase the stability of the immersion nozzle or a feed channel.
  • the molded part is a lateral boundary plate, as one particularly for a device for continuous pouring of molten metal between casting rolls, one so-called twin-roll caster required.
  • the molded part according to the invention permits the inductor device not having to assemble directly at the place of action and still have an early one Solidification of molten metal in the gussets towards the casting rolls avoid.
  • Such a molded part is a geometrically open structure with in Longitudinal side boundaries.
  • the molded part consists of an electrically conductive layer or has one such on. It is on the side facing the molten metal with a provided electrically insulating layer and points in the intermediate area at least one further electrically insulating longitudinal slot, which in Distance at least two, in this intermediate area almost over the entire Width of the molded part, interrupting the electromagnetic field Cross slots connects.
  • Such a configuration of the molded part allows Heating also in the area of the electromagnetic secondary field.
  • the slots in the Intermediate area intersecting longitudinal slots, creating a targeted Redirection of eddy currents into the secondary electromagnetic field or secondary electromagnetic fields is effected.
  • the electrically conductive materials have a specific electrical resistance ⁇ 1000 ohm mm 2 / m, preferably 200 ohm mm 2 / m. Experiments have shown that such materials have good coupling behavior. Particularly good results have been achieved with a carbon-bound, graphite-containing aluminum oxide material. For the electrically insulating slots and the electrically insulating inner and / or outer layer, electrically non-conductive, refractory materials, such as zirconium oxide, come into consideration.
  • Figure 1 shows a molded part (1), for example a refractory ceramic Immersion pouring tube for introducing molten metal into a mold or refractory ceramic feed channel for the application of molten metal a conveyor belt.
  • the molded part (1) is one Surround inductor device (2), the main electromagnetic field (A) generated.
  • the main electromagnetic field (A) generated.
  • an electromagnetic secondary field (B) in the Area (4 and 5) is essentially an electrically conductive layer (6) assembled molded part (1) in the longitudinal direction with a continuous, electrically isolating longitudinal slot (7) and the other Slits (10, 11) in the intermediate area (4).
  • the in the intermediate area (4) almost around the entire circumference of the molded part (1) running, electrically insulating transverse slots (11) are through a also electrically insulating longitudinal slot (10) connected to each other.
  • the inductor device (2) generates an electromagnetic secondary field (B) in the areas (4, 5), whereby it for inductive heating of the molded part (1) also in the areas (4, 5) is coming.
  • the molded part (1) which essentially consists of the electrical conductive layer (6), compared to that with molten metal Provide exposed surfaces with electrically insulating layers (8, 9).
  • These electrically insulating layers also include the end faces of the Molded part (1) insofar as they can be subjected to molten metal.
  • the electrically insulating inner layer (8) extends over all inner surfaces of the molded part (1).
  • the electrically insulating Outer layer (9) extends at least over the surface of the schematically illustrated melt sump.
  • the slots (7, 10, 11) are usually with an electrically insulating, ceramic material backfilled.
  • FIG. 2 shows a mold (1) used as a dip tube (16) shown.
  • a distributor vessel (18) is used as a dip tube (16) formed molded part (1) metal melt introduced into a mold (12).
  • the molded part (1) is over a schematically shown inductor device (2) heated inductively.
  • the molded part (1) is also sensitive to thermal shock when cast on Danger of bridging, as is the case especially with thin slab casting exists, through the possibility of inductive heating of the molded part (1) in Area of the bath level reduced during the pouring process.
  • Figure 3 shows an arrangement analogous to Figure 2, wherein the molten metal is not in a mold, but is placed on a conveyor (13).
  • the molded part (1) designed as a feed channel (17) does not submerge or only to a very small extent in the molten metal. Accordingly, an electrically insulating outer layer (9) can be made narrower.
  • FIG. 4 schematically shows a twin roll caster with a boundary plate (15) shown for lateral limitation.
  • the limiting plate (15) also heat inductively in the lower area. With this measure it can unwanted freezing of molten metal in the gussets, which from the Casting rolls and the or the boundary plates are formed, and what to destruction of the casting rolls or poor strip quality, be avoided.
  • Figure 5 shows a boundary plate (15) according to the invention, which in essentially of an electrically conductive slotted layer (6) and a electrically insulating inner layer (8).
  • the whole plate is preferably covered with an electrically insulating layer (9).
  • FIG 6 is a development of the molded part shown in Figure 1 (1) reproduced. This development includes the electrically conductive layer (6) interrupted by the electrically insulating longitudinal and transverse slots (10 and 11).
  • the inductor device (2) is used for inductive coupling in area (3) and due to the special design in the intermediate area (4) a course of the eddy currents outlined in area (5).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • General Induction Heating (AREA)
  • Continuous Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Heat Treatment Of Articles (AREA)
  • Ceramic Products (AREA)
  • Resistance Heating (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Prostheses (AREA)

Claims (12)

  1. Pièce moulée réfractaire conductrice de l'électricité ou pourvue d'un revêtement (6) conducteur de l'électricité, chauffée par induction, comportant au moins une fente longitudinale (7) électriquement isolante qui, dans une zone (3), est soumise à un champ principal (A) électromagnétique d'un inducteur (2), caractérisée par le fait que la pièce moulée (1) ou son revêtement conducteur de l'électricité (6), dans une zone intermédiaire (4) qui fait suite à la zone (3) mentionnée dans la direction longitudinale, comporte des fentes transversales (11) électriquement isolantes qui s'étendent sur pratiquement tout le pourtour ou pratiquement toute la largeur de la pièce moulée (1) de manière telle que les courants de Foucault induits dans la zone (3) soient déviés autour de ladite zone intermédiaire (5) dans une zone (5) de la pièce moulée qui lui fait suite.
  2. Pièce moulée selon la revendication 1, caractérisée par le fait que la pièce moulée (1) est une busette (16) immergée en céramique pour l'introduction de métal en fusion dans un creuset, en particulier dans une coquille (12).
  3. Pièce moulée selon la revendication 1, caractérisée par le fait que la pièce moulée (1) est un conduit d'alimentation (17) en céramique pour délivrer du métal en fusion sur un dispositif de transport (13), en particulier sur une bande transporteuse.
  4. Pièce moulée selon une des revendications 1 à 3, caractérisée par le fait que la pièce moulée (1) comporte un revêtement (6) conducteur de l'électricité avec une fente longitudinale (7) électriquement isolante continue que s'étend dans la direction longitudinale, ainsi qu'un revêtement intérieur (8) électriquement isolant tourné vers le métal en fusion, que la pièce moulée (1), dans une zone (5) en contact extérieurement avec le métal en fusion, comporte un revêtement extérieur (9) électriquement isolant, de telle sorte que le revêtement conducteur de l'électricité (6) ne soit pas en contact avec le métal en fusion et par le fait que la pièce moulée (1), dans la zone intermédiaire (4), comporte au moins une fente longitudinale (10) électriquement isolante supplémentaire qui relie au moins deux fentes transversales (11) électriquement isolantes présentes dans la zone intermédiaire (4) s'étendant sur pratiquement tout le pourtour de la pièce moulée (1).
  5. Pièce moulée selon la revendication 4, caractérisée par le fait qu'elle est divisée dans la direction longitudinale par une cloison (14) électriquement isolante.
  6. Pièce moulée selon la revendication 1, caractérisée par le fait que la pièce moulée (1) est une plaque de séparation (15) d'un dispositif pour la coulée continue de métal en fusion.
  7. Pièce moulée selon la revendication 6, caractérisée par le fait que la pièce moulée (1) comporte un revêtement conducteur de l'électricité (6) ainsi qu'un revêtement intérieur (8) électriquement isolant tourné vers le métal en fusion, par le fait que la pièce moulée (1), dans une zone intermédiaire (4), comporte une fente longitudinale (10) supplémentaire électriquement isolante qui relie au moins deux fentes transversales (11) électriquement isolantes présentes dans ladite zone intermédiaire (4) qui s'étendent sur pratiquement toute la largeur de la pièce moulée (1).
  8. Pièce moulée selon une des revendications 4, 5 ou 7, caractérisée par le fait que les fentes (10, 11) dans la zone intermédiaire (4) sont des fentes sécantes.
  9. Pièce moulée selon une des revendications 4, 5, 7 ou 8, caractérisée par le fait que des fentes supplémentaires sont prévues pour dévier les courants électriques de Foucault.
  10. Pièce moulée selon une des revendications 4, 5 ou 7 à 9, caractérisée par le fait que le revêtement conducteur de l'électricité (6) forme une surface fermée sur elle-même, telle que des courants électriques de Foucault peuvent s'y former.
  11. Pièce moulée selon une des revendications 4, 5 ou 7 à 10, caractérisée par le fait que le revêtement conducteur de l'électricité (6) présente une résistivité électrique <1000 Ohms mm2/m, de préférence <200 Ohm mm2/m.
  12. Pièce moulée selon une des revendications 4, 5 ou 7 à 11, caractérisée par le fait que le revêtement conducteur de l'électricité (6) est réalisé en des matériaux réfractaires contenant du carbone, en particulier du Al2O3 à liant carboné, contenant du graphite, et que les revêtements intérieur et/ou extérieur (8, 9) électriquement isolants sont réalisés en des matériaux réfractaires non conducteurs de l'électricité, en particulier en ZrO2.
EP96914880A 1995-04-28 1996-04-04 Procede de chauffage par induction d'une piece moulee refractaire et piece moulee appropriee Expired - Lifetime EP0771239B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19515230A DE19515230C2 (de) 1995-04-28 1995-04-28 Verfahren zum induktiven Aufheizen eines feuerfesten Formteils sowie ein entsprechendes Formteil
DE19515230 1995-04-28
PCT/EP1996/001477 WO1996033829A1 (fr) 1995-04-28 1996-04-04 Procede de chauffage par induction d'une piece moulee refractaire et piece moulee appropriee

Publications (2)

Publication Number Publication Date
EP0771239A1 EP0771239A1 (fr) 1997-05-07
EP0771239B1 true EP0771239B1 (fr) 1999-07-28

Family

ID=7760345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914880A Expired - Lifetime EP0771239B1 (fr) 1995-04-28 1996-04-04 Procede de chauffage par induction d'une piece moulee refractaire et piece moulee appropriee

Country Status (17)

Country Link
US (2) US5901776A (fr)
EP (1) EP0771239B1 (fr)
JP (1) JPH10502579A (fr)
KR (1) KR970703210A (fr)
CN (1) CN1152268A (fr)
AT (1) ATE182496T1 (fr)
AU (1) AU712223B2 (fr)
BR (1) BR9605800A (fr)
CA (1) CA2187450A1 (fr)
CZ (1) CZ289837B6 (fr)
DE (2) DE19515230C2 (fr)
ES (1) ES2136992T3 (fr)
FI (1) FI965232A (fr)
IN (1) IN188124B (fr)
MX (1) MX9700260A (fr)
WO (1) WO1996033829A1 (fr)
ZA (1) ZA963064B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19644345A1 (de) * 1996-10-25 1998-04-30 Didier Werke Ag Verfahren, Vorrichtung und Verschlußglied zum Angießen von flüssigen Schmelzen
SE512691C2 (sv) 1998-03-02 2000-05-02 Abb Ab Anordning för gjutning av metall
DE19843087A1 (de) * 1998-09-21 2000-03-23 Didier Werke Ag Induktor zur Erzeugung eines elektromagnetischen Wechselfeldes
DE20014593U1 (de) 2000-08-23 2000-12-14 Didier-Werke Ag, 65189 Wiesbaden Ausgusseinrichtung eines Schmelzegefäßes
US8050939B2 (en) * 2005-02-11 2011-11-01 Avaya Inc. Methods and systems for use in the provision of services in an institutional setting such as a healthcare facility
JP4746412B2 (ja) * 2005-11-21 2011-08-10 新日本製鐵株式会社 連続鋳造方法
US9873151B2 (en) * 2014-09-26 2018-01-23 Crucible Intellectual Property, Llc Horizontal skull melt shot sleeve
CN109932383B (zh) * 2018-11-22 2024-06-04 康姆罗拉有限公司 一种耐火陶瓷过滤器装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435992A (en) * 1966-03-11 1969-04-01 Tisdale Co Inc Pouring nozzle for continuous casting liquid metal or ordinary steel
FR2609914B1 (fr) * 1987-01-26 1990-04-13 Aubert & Duval Acieries Busette composite de coulee de metal liquide, notamment pour appareil d'atomisation du metal
US4784209A (en) * 1987-08-06 1988-11-15 Bethlehem Steel Corporation Continuous casting apparatus
JPH01205858A (ja) * 1988-02-10 1989-08-18 Daido Steel Co Ltd 連続鋳造用侵漬ノズル
JPH01217883A (ja) * 1988-02-25 1989-08-31 Jiyuuou:Kk 誘導加熱コイル用ボビン
DE3923550C2 (de) * 1989-07-15 1997-10-23 Ald Vacuum Techn Gmbh Verfahren und Dauerform zum Formgießen von elektrisch leitenden Werkstoffen
FR2670697B1 (fr) * 1990-12-24 1993-03-12 Pont A Mousson Chenal pour la mise en óoeuvre d'un procede de coulee sous pression d'un alliage metallique.
DE4108153A1 (de) * 1991-03-14 1992-09-17 Didier Werke Ag Feuerfestes formteil und dessen verwendung
DE4125916A1 (de) * 1991-08-05 1993-02-11 Didier Werke Ag Verfahren zum induktiven aufheizen von keramischen formteilen
US5160532A (en) * 1991-10-21 1992-11-03 General Electric Company Direct processing of electroslag refined metal
US5198017A (en) * 1992-02-11 1993-03-30 General Electric Company Apparatus and process for controlling the flow of a metal stream
FR2696960B1 (fr) * 1992-10-16 1994-11-25 Usinor Sacilor Dispositif de coulée continue entre cylindres de produits métalliques minces.

Also Published As

Publication number Publication date
US6148903A (en) 2000-11-21
AU7070396A (en) 1996-11-18
DE59602533D1 (de) 1999-09-02
MX9700260A (es) 1997-05-31
ATE182496T1 (de) 1999-08-15
US5901776A (en) 1999-05-11
ES2136992T3 (es) 1999-12-01
CZ375796A3 (en) 1997-05-14
JPH10502579A (ja) 1998-03-10
WO1996033829A1 (fr) 1996-10-31
CN1152268A (zh) 1997-06-18
FI965232A0 (fi) 1996-12-27
FI965232A (fi) 1996-12-27
CA2187450A1 (fr) 1996-10-29
EP0771239A1 (fr) 1997-05-07
AU712223B2 (en) 1999-11-04
ZA963064B (en) 1996-10-24
KR970703210A (ko) 1997-07-03
IN188124B (fr) 2002-08-24
DE19515230C2 (de) 1997-06-19
BR9605800A (pt) 1997-08-05
CZ289837B6 (cs) 2002-04-17
DE19515230A1 (de) 1996-11-07

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