EP1450974B1 - Device consisting of a heatable casting vessel and a ladle furnace - Google Patents

Device consisting of a heatable casting vessel and a ladle furnace Download PDF

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Publication number
EP1450974B1
EP1450974B1 EP02794964A EP02794964A EP1450974B1 EP 1450974 B1 EP1450974 B1 EP 1450974B1 EP 02794964 A EP02794964 A EP 02794964A EP 02794964 A EP02794964 A EP 02794964A EP 1450974 B1 EP1450974 B1 EP 1450974B1
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EP
European Patent Office
Prior art keywords
vessel
casting
slits
ladle furnace
magnetic coil
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
EP02794964A
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German (de)
French (fr)
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EP1450974A1 (en
EP1450974B8 (en
Inventor
Günter PHILLIPPS
Ralph Koppenhöfer
Carmen Scherer
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Induga Industrieofen und Giesserei-Anlagen & Co KG GmbH
Mercedes Benz Group AG
Original Assignee
Induga Industrieofen und Giesserei-Anlagen & Co KG GmbH
DaimlerChrysler AG
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Publication of EP1450974B1 publication Critical patent/EP1450974B1/en
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Publication of EP1450974B8 publication Critical patent/EP1450974B8/en
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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
    • H05B6/22—Furnaces without an endless core
    • H05B6/24—Crucible furnaces
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • F27B14/061—Induction furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B2014/0843—Lining or casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B2014/0862—Flux guides

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • the metals In order to bring a metal or a metal alloy into a pourable state, The metals must first be melted, then possibly a metallurgical Intermediate treatment and finally the casting process itself be supplied.
  • the melting of the metallic raw materials is usually done in a large volume Melting furnace, from where the melts in a pan and from there in be transferred to a casting plant.
  • many metals or metal alloys are sensitive to temperature changes, tend to be oxygen and hydrogen or others over the air or by contact with the ones used Vessels entering the melt other substances, such.
  • Z.T. also form undesirable chemical reactions on the respective molten metal scumbles. Many of the above reactions are favored by one or more refilling of the molten metal.
  • Negative effects also occur when the molten aluminum with moisture, z. As humid air, comes into contact. Due to the high temperatures the water splits into its components hydrogen and oxygen, whereby dissolved hydrogen in the melt during the solidification process in the form of trapped Gas bubbles again excreted; by hydrogen abstraction formed pores interrupt the structure in the casting.
  • Remedy can indeed supply so-called induction conveyors, for example from a smelting furnace into a tiltable treatment and casting furnace the liquid Transfer aluminum or aluminum alloy.
  • induction conveyors for example from a smelting furnace into a tiltable treatment and casting furnace the liquid Transfer aluminum or aluminum alloy.
  • eddy currents are generated, whereby a mechanical force is exerted in interaction with the metal can, that moves the metal.
  • the induced eddy currents heat the Liquid metal also on, so that temperature losses can be compensated.
  • induction crucible furnaces in which by means of the existing magnetic coil both a molten bath movement produced as well as a warming is guaranteed.
  • induction troughs in which by means of the existing magnetic coil both a molten bath movement produced as well as a warming is guaranteed.
  • induction troughs in which it is necessary that the inner wall of non-magnetic, electrically non-conductive refractory material, so that the magnetic fields not affected and the heat development occurs directly in the melt.
  • Induction troughs for conveying molten metal between two metallurgical are design and costly. In addition, they need this Gutter space and allow for any flexibility.
  • From DE 20 35 221 B is a device for keeping warm of metallic Melting in a ladle known, lined with refractory material is and a stationary, designed as a self-contained unit electro-inductive Heating device and has a, usable in this transportable ladle, their jacket completely or at least in the range of the action of the heater made of electrically non-conductive material.
  • the coat of the ladle can completely or at least in the range of the action of the heater of a preferably through deposits such as glass fiber reinforced plastic or longitudinally laminated Sheets exist, between each of which a Kunststoffisolier für is provided. This measure is intended to damage the pan in the electro-inductive Heating of the molten metal contained in it are avoided
  • the ladle is structurally very expensive.
  • Another electro-inductive heating device with a removable container is from EP 0 612 201 A2.
  • the casting vessel described therein has a Covering of individual, evenly arranged in the circumferential direction, non-magnetic Metal bars, whose free ends in the upper and in the lower area held together by a metal ring.
  • the outer oxide layer of a Each metal rod should serve as an electrical insulator in the area of the shocks to to prevent a disturbance of the magnetic field. Also this vessel has a constructive elaborate construction.
  • this vessel both as a transport vessel as well as a holding, alloying and / or degassing vessel and if necessary can also be used as a ladle, from which by means of a ladle desired batches are taken.
  • the from a melting vessel in the Casting vessel transferred molten metal is transferred to a heating station, where the Casting vessel is opened or used and the melt inductively heated and a Badonia is generated.
  • post-treatments like the Degas, Kornfeinen or even alloy adjustments are made, before the ladle is removed from the heating and led to the casting plant which is a rotary table for chill casting or a continuous casting plant can.
  • the pouring vessels preferably have a filling volume from 1 to 3 tons.
  • the vessel structure is basically of ladle metallurgy known, i. the vessels have a refractory lining and an outer one Metal sheath, which may not be ferromagnetic in the lower area to the desired magnetic field structure and the generation of eddy currents in the Melt does not affect.
  • the metal shell according to the invention in bottom area slit-shaped openings, which are located on Found casting vessel at the level of the magnetic coil. The said slots prevent in structurally simple way a large-scale generation of eddy currents, the overheating and damage to the ladle.
  • the slots are arranged longitudinally axially, wherein the length of the Slots between 120% and 150% of the length of the solenoid is, i. that the Slots the solenoid project in the longitudinal axial direction above and below.
  • the Width of the slots is between 2 mm and 10 mm.
  • the number of slots, which are preferably arranged equidistant in the vessel shell are determined essentially by the casting vessel diameter. At the before indicated fill volumes should be 4, 6, 8 or more slots in the metal jacket to be available.
  • the magnetic coil is preferred surrounded by an iron core (yokes).
  • the location of the slots in the casting vessel shell is approximately congruent in height after a further embodiment of the invention with the location of the yokes.
  • the heating stand has a magnetic coil, preferably at least two Contains windings and which is surrounded by an iron core (yokes).
  • the multiple winding The magnet coil provides the advantage that minimizes the Schustand height can be, e.g. on 150 to 300 mm, because of the multi-layer winding a correspondingly higher desired performance can be provided.
  • the Magnet coil and the yokes are preferably arranged in a frame, the then form the heating stand.
  • the heating level is height adjustable, which has the advantage that the remote on existing columns or a frame and centered vessel is then coupled to the heating station by the Heating station ramped up the lower area resp.
  • the heating is preferably made an annular base, in which the magnetic coil is integrated.
  • the vessel points in its lower portion has an outer shape that matches the inner surface of the annular Sockels is adapted, i. that with attached or inserted vessel between the magnet coil and the vessel jacket a dimensionally adapted Air gap remains. Should the frame with yokes and coil after positioning the inductive vessel by hydraulic lifting around the lower area of the Be laid, serves as a support frame or supports are present, have the corresponding adapted to the vessel bearing surface.
  • the transition area of the vessel from the lower part to the larger cross-section Upper part can according to an alternative embodiment as a collar-shaped bearing surface formed corresponding to the roof surface of the annular base. These The design is designed for fixed, non-height-adjustable heating stands be.
  • the above-described vessel as a transport, holding, alloying, degassing and / or pouring vessel for Molten metals, used in particular of aluminum or aluminum alloys, preferably in the way that the casting vessel on a rotary table system with several Working positions or linear system is used for chill casting.
  • the illustrated vessel 1 is placed on a heating stand 2.
  • the vessel 1 has an upper region with a diameter D 1 of 1100 mm, an intermediate region in which the diameter tapers and a lower region with a diameter D 2 of 500 mm, which is adapted to the geometry of the ladle used. From the dimensions results in a capacity of about 2 tons (2000 kg) of aluminum.
  • the vessel 1 has an insulating refractory lining and an outer metal sheath.
  • the metal shell 4 in the lower region consists of a non-ferromagnetic material, eg VA steel.
  • a double-layered magnet coil 5 which is enclosed by an iron core (yokes 7), is arranged around the lower, for example cylindrical outer jacket made of VA steel.
  • the coil 5 and the yokes 7 are installed in a common frame 8 which can be raised and lowered, as shown by the double arrow 9.
  • Existing lifting devices not shown, preferably operate hydraulically.
  • As a support for the vessel 1 serve three supports 10 in the present case, which undercut the vessel in the conical intermediate area.
  • the outer metal shell of the casting vessel in the lower Range i. slotted in height of the solenoid coil 5.
  • the slots 13 extend longitudinally and project beyond the magnet coil or its longitudinal axial height respectively above and bottom, wherein the length of the slots at least 1.2 times the longitudinal axial Length of the solenoid is.
  • the solenoid is surrounded by yokes 7, the (in height) are approximately congruent with the slots 13.
  • the slots overhang the yokes each top and bottom.
  • the illustrated vessel serves in the present case as a means of transport for herein filled melt volume and as an alloying, holding and degassing vessel.
  • the molten metal removed from a molten metal or the metal alloy remains during transport, any intermediate storage or an intermediate treatment, namely the degassing until the pouring in one and the same container, so that a Umgeh manen in other vessels or ovens avoided becomes.
  • Can molten metal due to procedural or operational reasons from the smelting furnace can not be transferred directly to the casting plant can at an intermediate station another heating station 2 be installed stationary, on the in the manner shown, the vessel 1 and placed by appropriate inductive Heating is maintained at the desired temperature. At this stopover metallurgical treatments of the melt are possible.
  • the alloy taken from the furnace is transferred to a pan leading to an intermediate station with a heating stand is transported, where the pan deposited on existing supports and then the Heating level is raised hydraulically until the lower area of the pan of the Magnetic coil is surrounded.
  • this intermediate station the molten metal, e.g. by injecting nitrogen or argon, degassed. Occurring temperature losses are compensated by the heating energy introduced via the heating station.
  • the metal melt is peeled off as needed and the pan closed transported in a casting plant, where they in a similar manner as previously described first centered on an existing heating station and then is raised by lifting the Schustandes to this.
  • the pan can do it afterwards by means of a ladle, the molten metal batch for pouring in Molds, e.g. are arranged on a casting carousel, taken successively become.
  • the lower taper of the vessel serves on a ladle adapted diameter for the purpose that the pan almost completely emptied can be.
  • the combination of the vessel and the heating station according to the invention can be used for any metal or metal alloy melts, in particular then when Umg screenvortician should be avoided if possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Details (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • General Induction Heating (AREA)

Abstract

The invention relates to a device consisting of a casting vessel (1) having a heatable, refractory lining and an outer metal jacket for receiving molten metal material, especially aluminum molten materials, and a ladle furnace (2) with a magnetic coil (5), wherein the casting vessel (1) is releasably placed on the stationary ladle furnace (2). According to the invention, the metal jacket of the casting vessel (1) has several openings (13) in the form of slits in the lower area.

Description

Die Erfindung betrifft eine Vorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a device according to the preamble of claim 1.

Um ein Metall bzw. eine Metalllegierung in einen gießfähigen Zustand zu bringen, müssen die Metalle zunächst erschmolzen, anschließend ggf. einer metallurgischen Zwischenbehandlung und schließlich dem Gießvorgang selbst zugeführt werden. Das Erschmelzen der metallischen Rohstoffe geschieht zumeist in einem großvolumigen Schmelzofen, von wo aus die Schmelzen in eine Pfanne und von dort aus in eine Gießanlage überführt werden. Viele Metalle bzw. Metallegierungen sind jedoch empfindlich gegen Temperaturschwankungen, neigen dazu, mit Sauerstoff und Wasserstoff oder anderen über die Luft oder durch Kontaktberührung mit den verwendeten Gefäßen in die Schmelze übertretenden anderen Stoffen, wie z.B. Eisen, unerwünschte Reaktionen einzugehen, die zu ungewollten Begleitstoffen in der Schmelze führen. Z.T. bilden sich, ebenfalls über unerwünschte chemische Reaktionen an dem jeweiligen Metallschmelzespiegel Krätzen aus. Viele der vorgenannten Reaktionen werden durch ein- oder mehrmaliges Umfüllen der Metallschmelze begünstigt.In order to bring a metal or a metal alloy into a pourable state, The metals must first be melted, then possibly a metallurgical Intermediate treatment and finally the casting process itself be supplied. The melting of the metallic raw materials is usually done in a large volume Melting furnace, from where the melts in a pan and from there in be transferred to a casting plant. However, many metals or metal alloys are sensitive to temperature changes, tend to be oxygen and hydrogen or others over the air or by contact with the ones used Vessels entering the melt other substances, such. Iron, unwanted Reacting reactions to unwanted impurities in the melt to lead. Z.T. also form undesirable chemical reactions on the respective molten metal scumbles. Many of the above reactions are favored by one or more refilling of the molten metal.

Dies gilt insbesondere auch für den Werkstoff Aluminium oder seine Legierungen, bei dem eine Oxidation weitestgehend zu verhindern und jegliche Gasaufnahme möglichst vollständig zu unterbinden ist. Die beim Schmelzvorgang vorliegenden Temperaturen bis etwa 770°C begünstigen die Oxidation des Aluminiums, die sich insbesondere deshalb gravierend auswirkt, weil das Aluminiumoxid eine dem Grundwerkstoff Aluminium gleiche Dichte besitzt, so dass sich entstandenes Al2O3 weder in der Schmelze absetzt, noch durch den Auftrieb an die Badoberfläche gespült wird. Die in der Aluminiumschmelze verbleibenden Oxide liegen im Guß als Schaum oder dünne Haut vor und können das Gefüge des fertiggegossenen Teiles im Sinne einer Verminderung der Festigkeit und der Dichtheit der Gußstücke beeinträchtigen. Besonders groß ist die Gefahr einer Aluminiumoxidbildung beim Umfüllen der Aluminiumschmelze in ein nachgeordnetes Transport- oder Behandlungsgefäß oder beim Abgießen in die Formen. Da unter normalen Gießereibedingungen das Oxid nicht weiter reduziert werden kann, sind besondere Vorsorgen zu treffen, um den als Abrand bezeichneten Oxidationsvorgang möglichst zu unterbinden.This applies in particular to the material aluminum or its alloys, in which oxidation is to be prevented to the greatest possible extent and any gas uptake must be prevented as completely as possible. The present during the melting process temperatures up to about 770 ° C favor the oxidation of the aluminum, which is particularly serious because the alumina has the same base material aluminum, so that formed Al 2 O 3 neither settles in the melt, or by the buoyancy is flushed to the bath surface. The oxides remaining in the aluminum melt are present in the casting as a foam or thin skin and can affect the structure of the finished cast part in terms of a reduction in the strength and tightness of the castings. Particularly high is the risk of alumina formation when transferring the molten aluminum in a downstream transport or treatment vessel or when pouring into the molds. Since the oxide can not be further reduced under normal foundry conditions, special precautions have to be taken in order to prevent as far as possible the oxidation process referred to as Abrand.

Negative Auswirkungen treten ebenso auf, wenn die Aluminiumschmelze mit Feuchtigkeit, z. B. feuchter Luft, in Berührung kommt. Aufgrund der hohen Temperaturen spaltet sich das Wasser in seine Bestandteile Wasserstoff und Sauerstoff auf, wobei sich gelöster Wasserstoff in der Schmelze beim Erstarrungsprozeß in Form von eingeschlossenen Gasbläßchen wieder ausscheidet; die durch Wasserstoffausscheidung gebildeten Poren unterbrechen das Gefüge im Gußstück.Negative effects also occur when the molten aluminum with moisture, z. As humid air, comes into contact. Due to the high temperatures the water splits into its components hydrogen and oxygen, whereby dissolved hydrogen in the melt during the solidification process in the form of trapped Gas bubbles again excreted; by hydrogen abstraction formed pores interrupt the structure in the casting.

In bestehenden Gießereibetrieben ist es häufig nach dem Stand der Technik üblich, dass aus einem großvolumigen Schmelzofen stammende Aluminium oder Aluminiumlegierungen in Pfannen umzufüllen, die als Transportmittel für die Schmelze zu einer Zwischenstation mit einem oder mehreren Warmhalteöfen dienen. Hiernach wird das Aluminium bzw. die Aluminiumlegierung nach Bedarf mittels eines weiteren Transportgefäßes in eine Gießanlage überführt, so dass bis zum eigentlichen Gießprozeß mehrere Umfüllvorgänge stattfinden.In existing foundries, it is common practice in the art to that from a large-volume furnace originating aluminum or Aluminum alloys in pans to be used as a means of transport for the Melt serve to an intermediate station with one or more holding furnaces. Thereafter, the aluminum or aluminum alloy is required by means of a transferred further transport vessel in a casting plant, so that up to actual casting process several Umfüllvorgänge take place.

Abhilfe können zwar sogenannte Induktionsförderrinnen liefern, die beispielsweise aus einem Schmelzofen in einen kippbaren Behandlungs- und Gießofen das flüssige Aluminium bzw. die Aluminiumlegierung überführen. Durch Induktion eines magnetischen Wechselfeldes im flüssigen Metall werden Wirbelströme erzeugt, wodurch in Wechselwirkung auf das Metall eine mechanische Kraft ausgeübt werden kann, die das Metall bewegt. Zudem heizen die induzierten Wirbelströme das flüssige Metall auch auf, so dass Temperaturverluste ausgeglichen werden können.Remedy can indeed supply so-called induction conveyors, for example from a smelting furnace into a tiltable treatment and casting furnace the liquid Transfer aluminum or aluminum alloy. By induction of a alternating magnetic field in the liquid metal, eddy currents are generated, whereby a mechanical force is exerted in interaction with the metal can, that moves the metal. In addition, the induced eddy currents heat the Liquid metal also on, so that temperature losses can be compensated.

Derselbe induktive Effekt wird auch in sogenannten Induktionstiegelöfen ausgenutzt, bei denen mittels der vorhandenen Magnetspule sowohl eine Schmelzbadbewegung erzeugt als auch eine Warmhaltung gewährleistet ist. Bei den genannten Induktionsrinnen wie auch den Öfen ist es erforderlich, dass die Innenwandung aus unmagnetischem, elektrisch nicht leitendem feuerfestem Material besteht, so dass die Magnetfelder nicht beeinträchtigt und die Wärmeentwicklung direkt im Schmelzgut eintritt.The same inductive effect is also exploited in so-called induction crucible furnaces, in which by means of the existing magnetic coil both a molten bath movement produced as well as a warming is guaranteed. In the mentioned induction troughs as well as the furnaces, it is necessary that the inner wall of non-magnetic, electrically non-conductive refractory material, so that the magnetic fields not affected and the heat development occurs directly in the melt.

Induktionsrinnen zum Fördern von Metallschmelzen zwischen zwei metallurgischen Gefäßen sind jedoch konstruktions- und kostenaufwendig. Zudem benötigen diese Rinnen Raum und lassen keinerlei Flexibilisierung zu.Induction troughs for conveying molten metal between two metallurgical However, vessels are design and costly. In addition, they need this Gutter space and allow for any flexibility.

Die in der Gießereitechnik daher nach wie vor verwendeten Transportgefäße haben den Nachteil, dass mangels der eigenen Heizung ein nicht unerheblicher Temperaturverlust der Schmelze während des Transports in Kauf zu nehmen ist. Grundsätzlich wäre es zwar möglich, auch die Transportgefäße mit einer induktiv arbeitenden Heizung zu versehen, jedoch hat dies den Nachteil, dass dann die Stromversorgungsleitung einschließlich der Kühlvorrichtungen für die Spule mitgeführt werden muß. Zudem würde eine im unteren Bereich eines Transportgefäßes installierte Heizvorrichtung das Gewicht und das Volumen dieses Transportgefäßes erheblich vergrößern und damit seine Handhabbarkeit erheblich erschweren.The therefore still used in the foundry technology transport containers the disadvantage that, in the absence of its own heating a significant loss of temperature the melt during transport is to be accepted. in principle It would be possible, even the transport vessels with an inductively working Heating to provide, however, this has the disadvantage that then the power supply line including the cooling devices for the coil are carried got to. In addition, one installed in the lower part of a transport vessel Heater the weight and volume of this transport vessel considerably enlarge and thus make his handling considerably difficult.

Aus der DE 20 35 221 B ist eine Einrichtung zum Warmhalten von metallischen Schmelzen in einer Gießpfanne bekannt, die mit feuerfestem Material ausgekleidet ist und die eine ortsfeste, als selbstständige Baueinheit ausgebildete elektroinduktive Heizeinrichtung und eine, in diese einsetzbare transportable Gießpfanne aufweist, deren Mantel ganz oder mindestens im Bereich der Einwirkung der Heizeinrichtung aus elektrisch nicht leitendem Material besteht. Der Mantel der Gießpfanne kann ganz oder mindestens im Bereich der Einwirkung der Heizeinrichtung aus einem vorzugsweise durch Einlagen wie Glasfasern verstärkten Kunststoff oder aus längslamellierten Blechen bestehen, zwischen denen jeweils eine Kunststoffisolierschicht vorgesehen ist. Mit dieser Maßnahme soll eine Beschädigung der Pfanne beim elektroinduktiven Beheizen der in ihr befindlichen Metallschmelze vermieden werden, jedoch ist das Gießgefäß konstruktiv sehr aufwendig. From DE 20 35 221 B is a device for keeping warm of metallic Melting in a ladle known, lined with refractory material is and a stationary, designed as a self-contained unit electro-inductive Heating device and has a, usable in this transportable ladle, their jacket completely or at least in the range of the action of the heater made of electrically non-conductive material. The coat of the ladle can completely or at least in the range of the action of the heater of a preferably through deposits such as glass fiber reinforced plastic or longitudinally laminated Sheets exist, between each of which a Kunststoffisolierschicht is provided. This measure is intended to damage the pan in the electro-inductive Heating of the molten metal contained in it are avoided However, the ladle is structurally very expensive.

Eine weitere elektroinduktive Heizeinrichtung mit einem abnehmbaren Behälter ist aus der EP 0 612 201 A2 bekannt. Das dort beschriebene Gießgefäß besitzt eine Umkleidung aus einzelnen, gleichmäßig in Umfangsrichtung angeordneten, nicht-magnetischen Metallstäben, deren freie Enden im oberen und im unteren Bereich von einem metallenen Ring zusammengehalten werden. Die äußere Oxidschicht eines jeden Metallstabes soll im Bereich der Stöße als elektrischer Isolator dienen, um eine Störung des Magnetfeldes zu verhindern. Auch dieses Gefäß weist einen konstruktiv aufwendigen Aufbau auf. Another electro-inductive heating device with a removable container is from EP 0 612 201 A2. The casting vessel described therein has a Covering of individual, evenly arranged in the circumferential direction, non-magnetic Metal bars, whose free ends in the upper and in the lower area held together by a metal ring. The outer oxide layer of a Each metal rod should serve as an electrical insulator in the area of the shocks to to prevent a disturbance of the magnetic field. Also this vessel has a constructive elaborate construction.

Es ist daher Aufgabe der vorliegenden Erfindung, ein induktiv heizbares Gefäß zu schaffen, das die vorgenannten Nachteile vermeidet und flexibel sowohl als Warmhalte- und/oder Entgasungsofen als auch als Transportgefäß und unter Umständen auch als Gießgefäß einsetzbar ist.It is therefore an object of the present invention to provide an inductively heatable vessel which avoids the aforesaid drawbacks and is flexible both as a holding and / or degassing furnace as well as a transport vessel and possibly can also be used as a casting vessel.

Diese Aufgabe wird durch das induktiv heizbare Gefäß nach Anspruch 1 gelöst.This object is achieved by the inductively heatable vessel according to claim 1.

Der Vorteil dieser Ausbildung besteht darin, dass dieses Gefäß sowohl als Transportgefäß als auch als Warmhalte-, Legierungs- und/oder Entgasungsgefäß und ggf. auch als Gießgefäß verwendet werden kann, aus dem mittels eines Schöpflöffels gewünschte Chargen entnommen werden. Die aus einem Schmelzgefäß in das Gießgefäß überführte Metallschmelze wird zu einem Heizstand überführt, wo das Gießgefäß auf- bzw. eingesetzt wird und die Schmelze induktiv beheizt und eine Badbewegung erzeugt wird. In dieser Station können Nachbehandlungen wie das Entgasen, Kornfeinen oder sogar Legierungseinstellungen vorgenommen werden, bevor das Gießgefäß vom Heizstand entnommen und zu der Gießanlage geführt wird, die eine Rundtischanlage zum Kokillenguß oder eine Stranggießanlage sein kann. Da die Metallschmelze vom Erschmelzen bis zur Gießstation in ein und demselben Gefäß verbleibt, entfallen auch Umfüllvorgänge, so dass der gefürchtete Abbrand (Oxidation) oder die sonstige Gasaufnahme, insbesondere von Wasserstoff insoweit ausgeschlossen wird. Die Gießgefäße haben vorzugsweise ein Füllvolumen von 1 bis 3 Tonnen. Der Gefäßaufbau ist grundsätzlich aus der Pfannenmetallurgie bekannt, d.h. die Gefäße besitzen eine feuerfeste Auskleidung sowie einen äußeren Metallmantel, der jedoch im unteren Bereich nicht ferromagnetisch sein darf, um den gewünschten Magnetfeldaufbau und die Erzeugung von Wirbelströmen in der Schmelze nicht zu beeinträchtigen. Der Metallmantel weist erfindungsgemäß im unteren Bereich schlitzförmige Durchbrechungen auf, die sich bei aufgesetztem Gießgefäß in Höhe der Magnetspule befinden. Die genannten Schlitze verhindern in konstruktiv einfacher Weise eine großflächige Erzeugung von Wirbelströmen, die zu einer Überhitzung und Beschädigung der Gießpfanne führen könnte. The advantage of this design is that this vessel both as a transport vessel as well as a holding, alloying and / or degassing vessel and if necessary can also be used as a ladle, from which by means of a ladle desired batches are taken. The from a melting vessel in the Casting vessel transferred molten metal is transferred to a heating station, where the Casting vessel is opened or used and the melt inductively heated and a Badbewegung is generated. In this station, post-treatments like the Degas, Kornfeinen or even alloy adjustments are made, before the ladle is removed from the heating and led to the casting plant which is a rotary table for chill casting or a continuous casting plant can. Since the molten metal from the melting to the casting station in and remains the same vessel, also accounts for refilling operations, so that the dreaded Burning (oxidation) or other gas uptake, especially of hydrogen is excluded in this respect. The pouring vessels preferably have a filling volume from 1 to 3 tons. The vessel structure is basically of ladle metallurgy known, i. the vessels have a refractory lining and an outer one Metal sheath, which may not be ferromagnetic in the lower area to the desired magnetic field structure and the generation of eddy currents in the Melt does not affect. The metal shell according to the invention in bottom area slit-shaped openings, which are located on Found casting vessel at the level of the magnetic coil. The said slots prevent in structurally simple way a large-scale generation of eddy currents, the overheating and damage to the ladle.

Erfindungsgemäß sind die Schlitze längsaxial angeordnet, wobei die Länge der Schlitze zwischen 120 % und 150 % der Länge der Magnetspule liegt, d.h. dass die Schlitze die Magnetspule in längsaxialer Richtung oben und unten überragen. Die Breite der Schlitze liegt zwischen 2 mm und 10 mm. Eine solche Schlitzbreite verhindert einerseits wirkungsvoll die Entstehung großflächiger Wirbelströme, andererseits ist die Schlitzbreite so gering, dass die Stabilität des Gießgefäßes nicht beeinträchtigt wird.According to the invention, the slots are arranged longitudinally axially, wherein the length of the Slots between 120% and 150% of the length of the solenoid is, i. that the Slots the solenoid project in the longitudinal axial direction above and below. The Width of the slots is between 2 mm and 10 mm. Such a slot width prevented on the one hand effectively the formation of large-scale eddy currents, on the other hand the slot width is so small that the stability of the casting vessel is not impaired becomes.

Die Anzahl der Schlitze, die vorzugsweise äquidistant im Gefäßmantel angeordnet sind, wird im wesentlichen durch den Gießgefäßdurchmesser bestimmt. Bei den zuvor angegebenen Füllvolumina sollten 4, 6, 8 oder mehr Schlitze im Metallmantel vorhanden sein.The number of slots, which are preferably arranged equidistant in the vessel shell are determined essentially by the casting vessel diameter. At the before indicated fill volumes should be 4, 6, 8 or more slots in the metal jacket to be available.

Wie prinzipiell nach dem Stand der Technik bekannt, ist die Magnetspule vorzugsweise von einem Eisenkern (Joche) umgeben. Die Lage der Schlitze im Gießgefäßmantel ist nach einer weiteren Ausgestaltung der Erfindung in der Höhe etwa deckungsgleich mit der Lage der Joche.As is known in principle in the prior art, the magnetic coil is preferred surrounded by an iron core (yokes). The location of the slots in the casting vessel shell is approximately congruent in height after a further embodiment of the invention with the location of the yokes.

Der Heizstand weist eine Magnetspule auf, die vorzugsweise mindestens zwei Wicklungen enthält und die von einem Eisenkern (Joche) umgeben ist. Die Mehrfachwicklung der Magnetspule schafft den Vorteil, dass die Heizstand-Bauhöhe minimiert werden kann, z.B. auf 150 bis 300 mm, da über die Mehrlagigkeit der Wicklung eine entsprechend höhere gewünschte Leistung erbracht werden kann. Die Magnetspule sowie die Joche sind vorzugsweise in einem Rahmen angeordnet, die dann den Heizstand bilden.The heating stand has a magnetic coil, preferably at least two Contains windings and which is surrounded by an iron core (yokes). The multiple winding The magnet coil provides the advantage that minimizes the Heizstand height can be, e.g. on 150 to 300 mm, because of the multi-layer winding a correspondingly higher desired performance can be provided. The Magnet coil and the yokes are preferably arranged in a frame, the then form the heating stand.

Nach einer weiteren Ausgestaltung der Erfindung ist der Heizstand höhenverstellbar, was den Vorteil hat, dass das auf vorhandenen Stützen bzw. einem Gestell abgesetzte und zentrierte Gefäß hiernach an den Heizstand angekoppelt wird, indem der Heizstand den unteren Bereich umgreifend hochgefahren bzw. vor dem Weitertrans port des Gefäßes abgesenkt wird. Hierzu besteht der Heizstand vorzugsweise aus einem ringförmigen Sockel, in den die Magnetspule integriert ist. Das Gefäß weist in seinem unteren Bereich eine äußere Form auf, die dem Innenmantel des ringförmigen Sockels angepaßte ist, d.h. dass bei aufgesetztem bzw. eingesetztem Gefäß zwischen der Magnetspule und dem Gefäßmantel ein dimensionsgerecht angepaßter Luftspalt verbleibt. Soll der Rahmen mit Joche und Spule nach Positionierung des induktiven Gefäßes durch hydraulisches Anheben um den unteren Bereich des Gefäßes gelegt werden, dient als Auflage ein Gestell bzw. sind Stützen vorhanden, die entsprechend dem Gefäß angepaßte Auflagefläche besitzen.According to a further embodiment of the invention, the heating level is height adjustable, which has the advantage that the remote on existing columns or a frame and centered vessel is then coupled to the heating station by the Heating station ramped up the lower area resp. Before the Weiterertrans is lowered port of the vessel. For this purpose, the heating is preferably made an annular base, in which the magnetic coil is integrated. The vessel points in its lower portion has an outer shape that matches the inner surface of the annular Sockels is adapted, i. that with attached or inserted vessel between the magnet coil and the vessel jacket a dimensionally adapted Air gap remains. Should the frame with yokes and coil after positioning the inductive vessel by hydraulic lifting around the lower area of the Be laid, serves as a support frame or supports are present, have the corresponding adapted to the vessel bearing surface.

Der Übergangsbereich des Gefäßes vom unteren Teil in den querschnittsgrößeren oberen Teil kann nach einer alternativen Ausgestaltung als kragenförmige Auflagefläche korrespondierend zur Dachfläche des ringförmigen Sockels ausgebildet. Diese Ausbildungsform ist für fest montierte, nicht höhenverstellbare Heizstände konzipiert sein.The transition area of the vessel from the lower part to the larger cross-section Upper part can according to an alternative embodiment as a collar-shaped bearing surface formed corresponding to the roof surface of the annular base. These The design is designed for fixed, non-height-adjustable heating stands be.

Nach einer weiteren Ausgestaltung der Erfindung wird das vorbeschriebene Gefäß als Transport-, Warmhalte-, Legierungs-, Entgasungs- und/oder Gießgefäß für Metallschmelzen, insbesondere aus Aluminium oder Aluminiumlegierungen verwendet, vorzugsweise in der Art, dass das Gießgefäß an einer Rundtischanlage mit mehreren Arbeitspositionen oder Linearanlage zum Kokillenguß verwendet wird.According to a further embodiment of the invention, the above-described vessel as a transport, holding, alloying, degassing and / or pouring vessel for Molten metals, used in particular of aluminum or aluminum alloys, preferably in the way that the casting vessel on a rotary table system with several Working positions or linear system is used for chill casting.

Weitere Ausgestaltungen der Erfindung sowie sich hieraus ergebende Vorteile werden anhand des in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Es zeigen:

Fig. 1
einen Querschnitt durch ein Gießgfäß, das an einen Heizstand angekoppelt ist und
Fig. 2
eine weitere teilgeschnittene Ansicht des Gießgefäßes nach Fig. 1.
Further embodiments of the invention and the resulting advantages are explained with reference to the embodiment shown in the drawing. Show it:
Fig. 1
a cross section through a Gießgfäß, which is coupled to a heating station and
Fig. 2
a further partially sectioned view of the casting vessel of Fig. 1st

Das dargestellte Gefäß 1 ist auf einen Heizstand 2 aufgesetzt. Das Gefäß 1 besitzt einen oberen Bereich mit einem Durchmesser D1 von 1100 mm, einen Zwischenbereich, in dem sich der Durchmesser verjüngt und einen unteren Bereich mit einem Durchmesser D2 von 500 mm, der der Geometrie des verwendeten Schöpflöffels angepaßt ist. Aus den Dimensionen ergibt sich ein Füllvermögen von ca. 2 to (2000 kg) Aluminium. Das Gefäß 1 besitzt eine isolierende feuerfeste Auskleidung sowie einen äußeren Metallmantel. Der Metallmantel 4 im unteren Bereich besteht aus einem nicht ferromagnetischen Material, z.B. VA-Stahl. Um den unteren, beispielsweise zylindrischen Außenmantel aus VA-Stahl ist im Abstand eines Luftspaltes 6 eine doppellagige Magnetspule 5 angeordnet, die über einen Eisenkern (Joche 7) umschlossen wird. Die Spule 5 und die Joche 7 sind in einem gemeinsamen Rahmen 8 installiert, der heb- und senkbar ist, wie dies durch den Doppelpfeil 9 sichtbar gemacht ist. Vorhandene, nicht dargestellte Hubeinrichtungen arbeiten vorzugsweise hydraulisch. Als Auflage für das Gefäß 1 dienen im vorliegenden Fall drei Stützen 10, die das Gefäß im konischen Zwischenbereich unterfassen.The illustrated vessel 1 is placed on a heating stand 2. The vessel 1 has an upper region with a diameter D 1 of 1100 mm, an intermediate region in which the diameter tapers and a lower region with a diameter D 2 of 500 mm, which is adapted to the geometry of the ladle used. From the dimensions results in a capacity of about 2 tons (2000 kg) of aluminum. The vessel 1 has an insulating refractory lining and an outer metal sheath. The metal shell 4 in the lower region consists of a non-ferromagnetic material, eg VA steel. At the distance of an air gap 6, a double-layered magnet coil 5, which is enclosed by an iron core (yokes 7), is arranged around the lower, for example cylindrical outer jacket made of VA steel. The coil 5 and the yokes 7 are installed in a common frame 8 which can be raised and lowered, as shown by the double arrow 9. Existing lifting devices, not shown, preferably operate hydraulically. As a support for the vessel 1 serve three supports 10 in the present case, which undercut the vessel in the conical intermediate area.

Soll auf eine heb- und senkbare Heizeinrichtung 2 verzichtet werden, kann auch der kragenförmige Bereich 11 als Abstützfläche auf eine entsprechende ringförmige Auflagefläche des Heizstandes dienen. Wesentliches Merkmal der vorliegenden Erfindung ist jedoch für beide Ausführungsaltemativen, dass das Gefäß 1 lösbar mit dem Heizstand 2 verbunden ist. Ist das Gefäß 1 in der dargestellten Weise auf- bzw. in den Heizstand 2 eingesetzt, wird mittels der Magnetspule 5 ein Feld induziert, das in der Schmelze eine Badbewegung hervorruft sowie der Schmelze Wärme zuführt. Der Heizstand 2 kann neben einem Gießkarussel mit mehreren Gießkokillen angeordnet sein, so dass aus dem mittels eines Schöpflöffels 12 die gewünschte Charge aus dem Gefäß 1 entnommen und vergossen werden kann.Should be waived on a raised and lowered heater 2, and the Collar-shaped portion 11 as a support surface on a corresponding annular Support surface of the heating stand serve. Essential feature of the present Invention is, however, for both Ausführungsaltemativen that the vessel 1 detachable with the heating station 2 is connected. Is the vessel 1 in the manner shown up or used in the heating 2, a field is induced by means of the magnetic coil 5, the causes a bath movement in the melt and supplies heat to the melt. The heating 2 can be next to a casting carousel with several casting molds be arranged so that from the means of a ladle 12, the desired Batch can be removed from the vessel 1 and shed.

Wie aus Fig. 2 ersichtlich, ist der äußere Metallmantel des Gießgefäßes im unteren Bereich, d.h. in Höhe der Magnetspule 5 geschlitzt. Die Schlitze 13 verlaufen längsaxial und überragen die Magnetspule bzw. deren längsaxiale Höhe jeweils oben und unten, wobei die Länge der Schlitze mindestens das 1,2-fache der längsaxialen Länge der Magnetspule beträgt. Die Magnetspule ist von Jochen 7 umgeben, die (in der Höhe) etwa deckungsgleich mit den Schlitzen 13 liegen. Vorzugsweise und wie in Fig. 2 dargestellt, überragen die Schlitze die Joche jeweils oben und unten.As can be seen from Fig. 2, the outer metal shell of the casting vessel in the lower Range, i. slotted in height of the solenoid coil 5. The slots 13 extend longitudinally and project beyond the magnet coil or its longitudinal axial height respectively above and bottom, wherein the length of the slots at least 1.2 times the longitudinal axial Length of the solenoid is. The solenoid is surrounded by yokes 7, the (in height) are approximately congruent with the slots 13. Preferably and As shown in Fig. 2, the slots overhang the yokes each top and bottom.

Das dargestellte Gefäß dient im vorliegenden Fall als Transportmittel für das hierin eingefüllte Schmelzvolumen sowie als Legierungs-, Warmhalte- und Entgasungsgefäß. Das aus einem Schmelzofen entnommene flüssige Metall bzw. die Metalllegierung verbleibt während des Transportes, einer etwaigen Zwischenlagerung oder einer Zwischenbehandlung, nämlich dem Entgasen bis zum Vergießen in ein- und demselben Behälter, so dass ein Umgießen in andere Gefäße oder Öfen vermieden wird. Kann aus verfahrenstechnischen oder betriebstechnischen Gründen die Metallschmelze vom Schmelzofen nicht unmittelbar zur Gießanlage überführt werden, kann an einer Zwischenstation ein weiterer Heizstand 2 stationär installiert sein, auf den in der dargestellten Weise das Gefäß 1 aufgesetzt und durch entsprechende induktive Heizung auf der gewünschten Temperatur gehalten wird. An dieser Zwischenstation sind metallurgische Behandlungen der Schmelze möglich.The illustrated vessel serves in the present case as a means of transport for herein filled melt volume and as an alloying, holding and degassing vessel. The molten metal removed from a molten metal or the metal alloy remains during transport, any intermediate storage or an intermediate treatment, namely the degassing until the pouring in one and the same container, so that a Umgehießen in other vessels or ovens avoided becomes. Can molten metal due to procedural or operational reasons from the smelting furnace can not be transferred directly to the casting plant can at an intermediate station another heating station 2 be installed stationary, on the in the manner shown, the vessel 1 and placed by appropriate inductive Heating is maintained at the desired temperature. At this stopover metallurgical treatments of the melt are possible.

In einem konkreten Anwendungsfall wird die dem Schmelzofen entnommene Legierung in eine Pfanne umgefüllt, die zu einer Zwischenstation mit einem Heizstand transportiert wird, wo die Pfanne auf vorhandene Stützen abgesetzt und wonach der Heizstand hydraulisch angehoben wird, bis der untere Bereich der Pfanne von der Magnetspule umgeben ist. In dieser Zwischenstation wird die Metallschmelze, z.B. durch Eindüsen von Stickstoff oder Argon, entgast. Auftretende Temperaturverluste werden durch die über den Heizstand eingebrachte Heizenergie kompensiert. Nach hinreichender Entgasung (oder einer anderen gewünschten metallurgischen Behandlung) wird nach Bedarf die Metallschmelze abgeschlackt und die Pfanne zu einer Gießanlage transportiert, wo sie in entsprechender Weise wie zuvor beschrieben auf einen dort vorhandenen Heizstand zunächst zentriert und anschließend durch Heben des Heizstandes an diesen angekoppelt wird. Der Pfanne kann danach mittels eines Schöpflöffels die Metallschmelze chargenweise zum Vergießen in Kokillen, die z.B. auf einem Gießkarussel angeordnet sind, sukzessive entnommen werden. Hierbei dient die untere Verjüngung des Gefäßes auf einen dem Schöpflöffel angepaßten Durchmesser dem Zweck, dass die Pfanne praktisch vollständig entleert werden kann.In a concrete application, the alloy taken from the furnace is transferred to a pan leading to an intermediate station with a heating stand is transported, where the pan deposited on existing supports and then the Heating level is raised hydraulically until the lower area of the pan of the Magnetic coil is surrounded. In this intermediate station the molten metal, e.g. by injecting nitrogen or argon, degassed. Occurring temperature losses are compensated by the heating energy introduced via the heating station. To adequate degassing (or any other desired metallurgical Treatment), the metal melt is peeled off as needed and the pan closed transported in a casting plant, where they in a similar manner as previously described first centered on an existing heating station and then is raised by lifting the Heizstandes to this. The pan can do it afterwards by means of a ladle, the molten metal batch for pouring in Molds, e.g. are arranged on a casting carousel, taken successively become. Here, the lower taper of the vessel serves on a ladle adapted diameter for the purpose that the pan almost completely emptied can be.

Grundsätzlich ist die erfindungsgemäße Kombination aus dem Gefäß und dem Heizstand für beliebige Metall- oder Metalllegierungsschmelzen einsetzbar, insbesondere dann, wenn Umgießvorgänge möglichst vermieden werden sollen.Basically, the combination of the vessel and the heating station according to the invention can be used for any metal or metal alloy melts, in particular then when Umgießvorgänge should be avoided if possible.

Claims (8)

  1. A device consisting of a heatable casting vessel (1) having a refractory lining and an outer metal jacket for receiving molten metal material, especially aluminium molten materials, and a ladle furnace (2) with a magnetic coil (5), wherein the casting vessel (1) is releasably placed on the stationary ladle furnace (2),
    characterized in that
    the metal jacket of the casting vessel (1) is slit, so that it has several openings (13) in the form of slits, preferably being arranged in direction of the longitudinal axis, said openings are located at the height of the magnetic coil (5) when the casting vessel (1) is set up, whereby the length of the slits (13) lies between 120% and 150% of the length of the magnetic coil (5) and the width of the slits (13) lies between 2 mm and 10 mm.
  2. A device according to claim 1, characterized in that the slits (13) are spaced in an equal distance to each other and/or that at least 4 slits are provided.
  3. A device according to one of the claims 1 or 2, characterized in that the magnetic coil (5) is surrounded by an iron core (yoke) (7) and that the position of the slits (13) referring to the height is about the same as the position of the yoke (7) when the casting vessel (1) is set up.
  4. A device according to one of the claims 1 to 3, characterized in that the ladle furnace (2) has a magnetic coil (5) that preferably comprises at least two turns and that it is surrounded by an iron core (7).
  5. A device according to one of the claims 1 to 4, characterized in that the ladle furnace (2) is adjustable for height, preferably hydraulically adjustable for height.
  6. A device according to one of the claims 1 to 5, characterized in that the ladle furnace has a ring-like base, in which the magnet coil (5) is integrated, and in that the vessel (1) in its lower area has an outer shape that is adjusted to the inner surface of the ring-like base (8).
  7. A device according to one of the claims 1 to 6, characterized in that the transition from the lower area of the vessel to the upper area of the vessel, which is having a greater diameter than the lower area, is formed as a collar-like support surface corresponding to the top surface of the ring-like base (8).
  8. An application of the vessel (1) according to one of the claims 1 to 7 as a vessel for transporting, warm-keeping, alloying, degassing and/or casting of molten metal material, especially aluminium or aluminium alloys, preferably at circular table installations with several operational stations or at in-line installations with stations for pouring, pan-removing and degassing.
EP02794964A 2001-12-04 2002-12-02 Device consisting of a heatable casting vessel and a ladle furnace Expired - Lifetime EP1450974B8 (en)

Applications Claiming Priority (3)

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DE10159306A DE10159306A1 (en) 2001-12-04 2001-12-04 Induction heatable vessel for melting metal and use of this vessel
DE10159306 2001-12-04
PCT/DE2002/004407 WO2003047792A1 (en) 2001-12-04 2002-12-02 Device consisting of a heatable casting vessel and a ladle furnace

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DE102004008044A1 (en) * 2004-02-19 2005-09-08 INDUGA Industrieöfen und Giesserei-Anlagen GmbH & Co. KG Made of heated pouring vessel and a heater existing device
DE102013114811B3 (en) 2013-12-23 2014-12-31 Ald Vacuum Technologies Gmbh Apparatus and method for treating metallic material
DE102014110251A1 (en) * 2014-07-21 2016-01-21 Stephan Schwenkel Melting unit for melting casting materials and a method for producing a melt for casting
CN106643151A (en) * 2016-11-28 2017-05-10 无锡市莱达热工工程有限公司 Molten zinc heat preserving furnace

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US1795842A (en) * 1929-01-08 1931-03-10 Westinghouse Electric & Mfg Co Induction furnace
GB893862A (en) * 1957-09-04 1962-04-18 Wild Barfield Electr Furnaces Induction heated furnaces
DE1136435B (en) * 1958-03-19 1962-09-13 Aeg Channelless induction crucible furnace for melting metals, overheating and keeping molten metal warm
DE2035221B1 (en) * 1970-07-16 1971-10-14 Deutsche Edelstahlwerke AG, 4150Krefeld Device for keeping metallic melts warm
JPS59143559U (en) * 1983-03-18 1984-09-26 川崎製鉄株式会社 Continuous casting tandate with molten steel heating device
SE452190B (en) * 1984-02-06 1987-11-16 Asea Ab POWDER OR HEATER (TUNDISH) FOR INDUCTIVE HEATING AND / OR MIXING OF METAL METAL MELTERS AS STEEL
DE3910777C2 (en) * 1989-04-04 2001-08-09 Ald Vacuum Techn Ag Induction furnace with a metal crucible
JP2692367B2 (en) * 1989-11-09 1997-12-17 富士電機株式会社 Ladle bath water heating device
US5425048A (en) * 1990-01-31 1995-06-13 Inductotherm Corp. Heating apparatus for induction ladle and vacuum furnaces
DE20119657U1 (en) * 2001-12-04 2002-03-21 INDUGA Industrieöfen und Gießerei-Anlagen GmbH & Co. KG, 50739 Köln Induction heatable vessel for metallic melting material

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AU2002360884A1 (en) 2003-06-17
DE10159306A1 (en) 2003-06-12
WO2003047792A1 (en) 2003-06-12
ATE297825T1 (en) 2005-07-15
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EP1450974B8 (en) 2005-08-17
WO2003047792A8 (en) 2005-08-18

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