EP0284565A1 - Electromagnetic continuous casting mould - Google Patents

Electromagnetic continuous casting mould Download PDF

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Publication number
EP0284565A1
EP0284565A1 EP88810179A EP88810179A EP0284565A1 EP 0284565 A1 EP0284565 A1 EP 0284565A1 EP 88810179 A EP88810179 A EP 88810179A EP 88810179 A EP88810179 A EP 88810179A EP 0284565 A1 EP0284565 A1 EP 0284565A1
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EP
European Patent Office
Prior art keywords
mold
screen
inductor
sides
narrow sides
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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
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EP88810179A
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German (de)
French (fr)
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EP0284565B1 (en
Inventor
Jean-Claude Weber
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.)
3A Composites International AG
Original Assignee
Alusuisse Holdings AG
Schweizerische Aluminium AG
Alusuisse Lonza Services Ltd
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Application filed by Alusuisse Holdings AG, Schweizerische Aluminium AG, Alusuisse Lonza Services Ltd filed Critical Alusuisse Holdings AG
Priority to AT88810179T priority Critical patent/ATE56897T1/en
Publication of EP0284565A1 publication Critical patent/EP0284565A1/en
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Publication of EP0284565B1 publication Critical patent/EP0284565B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
    • B22D11/015—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces using magnetic field for conformation, i.e. the metal is not in contact with a mould

Definitions

  • the invention relates to an electromagnetic continuous casting mold for the vertical casting of rolled bars, with an inductor and an electromagnetic screen partially covering this, the screen being arranged with respect to the inductor on the broad sides of the mold in such a way that the electromagnetic turbulence in the liquid head of the strand is minimal is.
  • rolling ingot includes casting strands with essentially rectangular, i.e. Cross-sectional dimensions having broad or rolled sides and narrow sides understood.
  • heat is removed from the strand emerging from the mold by applying coolant to the surface of the strand directly below the mold.
  • the coolant initially only touches the start-up floor.
  • the indirect heat removal that occurs leads to a mild solidification of the liquid metal and to an even formation of the strand base.
  • the coolant hits the surface of the strand, which is associated with a sudden increase in heat dissipation from the strand.
  • the thermal stresses that occur as a result of this temperature shock are greater than the tensile strength of the strand and lead to permanent deformation in the form of a convex curvature of the strand foot.
  • the cooling intensity can be reduced, for example, at least during the start-up process.
  • a coolant with gas dissolved in it is used, which when the coolant hits the Strand surface forms an insulating film reducing heat flow.
  • a significant advantage of electromagnetic over conventional continuous casting molds lies in the more uniform formation of the strand surface, which is free of cold running, exudation, surface segregation and other near-surface defects, so that in most cases there is no need to mill the strand surface.
  • the electromagnetic force field generated by the inductor stimulates melt circulation in the liquid head of the strand.
  • This electromagnetic turbulence can, among other things, detach the oxide skin and consequently impair the solidification conditions and the melt quality in the area of the solidifying strand surface. This manifests itself, for example, in an accumulation of oxide inclusions, in longitudinal folds and in those surface defects which only appear in the form of surface slate, looper lines and the like in the processed material.
  • alloys with a strong tendency to oxidize such as e.g. B.
  • the inventor has set himself the goal of further developing an electromagnetic continuous casting mold of the type mentioned at the outset in such a way that the strands can be prevented from escaping during casting, while accepting a minimal melt circulation in the liquid head of the casting strand.
  • the screen is arranged or designed on the narrow sides of the mold in such a way that the electromagnetic force directed at the liquid head of the strand is greater on the narrow sides of the mold than on the broad sides thereof.
  • This measure increases the electromagnetic force directed towards the middle of the strand on the narrow sides of the mold, so that a certain strand root warping can be accepted without the risk of the strand running out on its narrow sides.
  • the casting process is therefore safer during the start-up process.
  • the melt circulation in the liquid head of the casting strand is only slightly increased.
  • the design of the mold according to the invention enables casting of large-sized rolled bars made of aluminum alloys with magnesium contents of 4% and more.
  • the vertical distance between the lower edge of the inductor and the lower edge of the screen is greater on the narrow sides of the mold than on the broad sides thereof.
  • the lower edges of the screen lie on the broad and narrow sides of the mold at the same height, the inductor being arranged higher on the broad sides of the mold than on its narrow sides.
  • the inductor is arranged on the broad and narrow sides of the mold at the same height, the lower edges of the screen being higher on the narrow sides of the mold than on the broad sides thereof.
  • the difference between the vertical distance between the lower edge of the screen and the lower edge of the inductor on the broad sides compared to the vertical distance between the lower edge of the screen and the lower edge of the inductor on the narrow sides of the mold is preferably at most 70%, preferably 10-30%, of the vertical dimension of the inductor.
  • the screen has a different cross-section on the narrow sides of the mold or a different electrical conductivity than on the broad sides thereof.
  • inductor and electromagnetic shield naturally does not only relate to molds with a fixed casting cross-section, but is also particularly suitable for molds with a variable casting cross-section, i.e. for example for a mold with stationary side walls and sliding end walls, as is known for example from EP-A-0 109 357.
  • a mold 1 has a coolant box 2, on which by means of screws 3 a support body 4 made of electrical insulating material is attached. This supporting body 4 is in contact with a loop-shaped inductor 6, which is held by screws 5 and has a tubular cooling channel 7 on the back for receiving a coolant.
  • a downwardly tapering electromagnetic screen 9 made of an electrically conductive, non-ferromagnetic material is fastened by means of screws 8. Screen 9 and inductor 6 create a gap 10, from which coolant is passed from a coolant chamber 11 via a channel 12 to the surface of a casting strand (not shown in the figure).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Rehabilitation Tools (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Confectionery (AREA)
  • Medicinal Preparation (AREA)

Abstract

An electromagnetic mold for vertical continuous casting of rolling slabs, featuring an inductor and an electromagnetic screen partly covering the induction is such that the vertical distance between the lower edge of the inductor and the lower edge of the screen is greater at the narrow sides of the mold than at the broad sides of the mold. As a result of this arrangement it is possible to prevent metal running out of the ingot head at the narrow sides during the start-up phase. The foregoing is achieved at the expense of an insignificant amount of melt circulation occurring in the molten head of the ingot.

Description

Die Erfindung betrifft eine elektromagnetische Stranggiess­kokille zum vertikalen Giessen von Walzbarren, mit einem Induktor und einem diesen teilweise überdeckenden elektro­magnetischen Schirm, wobei der Schirm in bezug auf den Induktor an den Breitseiten der Kokille derart angeordnet ist, dass die elektromagnetische Turbulenz im flüssigen Kopf des Stranges minimal ist.The invention relates to an electromagnetic continuous casting mold for the vertical casting of rolled bars, with an inductor and an electromagnetic screen partially covering this, the screen being arranged with respect to the inductor on the broad sides of the mold in such a way that the electromagnetic turbulence in the liquid head of the strand is minimal is.

Unter dem Begriff Walzbarren werden Giessstränge mit im we­sentlichen rechteckigen, d.h. Breit- bzw. Walzseiten und Schmalseiten aufweisenden Querschnittabmessungen verstan­den.The term rolling ingot includes casting strands with essentially rectangular, i.e. Cross-sectional dimensions having broad or rolled sides and narrow sides understood.

Beim elektromagnetischen Stranggiessen wird dem aus der Ko­kille austretenden Strang durch Beaufschlagen der Strang­oberfläche mit Kühlmittel unmittelbar unter der Kokille Wärme entzogen. Während des Anfahrvorganges berührt das Kühlmittel zunächst nur den Anfahrboden. Der hierbei ein­tretende indirekte Wärmeentzug führt zu einer milden Er­starrung des flüssigen Metalls und zu einer ebenen Ausbil­dung des Strangfusses. Mit fortschreitendem Absenken des Anfahrbodens trifft das Kühlmittel direkt auf die Oberflä­che des Stranges, was mit einer sprunghaften Erhöhung der Wärmeabfuhr aus dem Strang verbunden ist. Die als Folge dieses Temperaturschocks auftretenden Wärmespannungen sind grösser als die Dehnungsfestigkeit des Stranges und führen zu einer bleibenden Verformung in Form einer konvexen Wöl­bung des Strangfusses.In electromagnetic continuous casting, heat is removed from the strand emerging from the mold by applying coolant to the surface of the strand directly below the mold. During the start-up process, the coolant initially only touches the start-up floor. The indirect heat removal that occurs leads to a mild solidification of the liquid metal and to an even formation of the strand base. With the progressive lowering of the start-up floor, the coolant hits the surface of the strand, which is associated with a sudden increase in heat dissipation from the strand. The thermal stresses that occur as a result of this temperature shock are greater than the tensile strength of the strand and lead to permanent deformation in the form of a convex curvature of the strand foot.

Um den Strangfuss möglichst flach zu halten, kann bei­spielsweise die Kühlintensität zumindest während des An­fahrvorganges vermindert werden. Bei einem bekannten Ver­fahren wird ein Kühlmittel mit in diesem gelöstem Gas ver­wendet, welches beim Auftreffen des Kühlmittels auf der Strangoberfläche einen den Wärmeabfluss vermindernden Iso­lierfilm bildet.In order to keep the strand base as flat as possible, the cooling intensity can be reduced, for example, at least during the start-up process. In a known method, a coolant with gas dissolved in it is used, which when the coolant hits the Strand surface forms an insulating film reducing heat flow.

Ein wesentlicher Vorteil elektromagnetischer gegenüber kon­ventionellen Stranggiesskokillen liegt in der gleichmässi­geren Ausbildung der Strangoberfläche, welche frei von Kaltlauf, Ausschwitzungen, Oberflächenseigerungen und wei­teren oberflächennahen Fehlern ist, so dass sich in den meisten Fällen ein Ueberfräsen der Strangoberfläche er­übrigt.A significant advantage of electromagnetic over conventional continuous casting molds lies in the more uniform formation of the strand surface, which is free of cold running, exudation, surface segregation and other near-surface defects, so that in most cases there is no need to mill the strand surface.

Das von Induktor erzeugte, elektromagnetische Kraftfeld regt im flüssigen Kopf des Stranges eine Schmelzezirkula­tion an. Diese elektromagnetische Turbulenz kann unter an­derem Ablösungen der Oxidhaut bewirken und in der Folge zu einer Beeinträchtigung der Erstarrungsbedingungen und der Schmelzequalität im Bereich der erstarrenden Strangoberflä­che führen. Dies äussert sich beispielsweise in einer An­häufung von Oxideinschlüssen, in Längsfalten sowie in sol­chen Oberflächenfehlern, welche erst beim weiterverarbeite­ten Material in Form von Oberflächenschiefer, looper lines und ähnlichem hervortreten. Besonders empfindlich sind na­turgemäss Legierungen mit starker Oxidationsneigung, wie z. B. Aluminium-Magnesium-Legierungen mit einem Magnesium­gehalt von 4 % und mehr. Probleme können sich auch beim Vergiessen von Spezialqualitäten ergeben, so dass ein Ueberfräsen der Strangoberfläche erforderlich sein kann, wodurch die generellen Vorzüge des elektromagnetischen Giessens nicht voll ausgenützt werden können.The electromagnetic force field generated by the inductor stimulates melt circulation in the liquid head of the strand. This electromagnetic turbulence can, among other things, detach the oxide skin and consequently impair the solidification conditions and the melt quality in the area of the solidifying strand surface. This manifests itself, for example, in an accumulation of oxide inclusions, in longitudinal folds and in those surface defects which only appear in the form of surface slate, looper lines and the like in the processed material. Naturally, alloys with a strong tendency to oxidize, such as e.g. B. Aluminum-magnesium alloys with a magnesium content of 4% and more. Problems can also arise when casting special qualities, so that it may be necessary to mill the strand surface, which means that the general advantages of electromagnetic casting cannot be fully exploited.

Um die elektromagnetische Turbulenz zu minimieren, ist be­kannt, dass man die Ueberdeckung des Induktors durch den elektromagnetischen Schirm vergrössert. Bei grösserer Ue­berdeckung sinkt jedoch auch die elektromagnetische Kraft, welche zur Strangmitte gerichtet ist. Dadurch können sich Probleme beim Angiessen ergeben, indem auf den Schmalseiten der Stränge infolge der verminderten elektromagnetischen Kraft und der Strangfussverwölbung die Stränge beim An­giessen auslaufen, was zum Giessabbruch führen kann.In order to minimize the electromagnetic turbulence, it is known that the coverage of the inductor by the electromagnetic shield is increased. With greater coverage, however, the electromagnetic force, which is directed towards the middle of the strand, also drops. This can result in problems when casting on, on the narrow sides of the strands due to the reduced electromagnetic Due to the force and the arch of the strand foot, the strands run out during casting, which can lead to the casting being broken off.

Angesichts dieser Gegebenheiten hat sich der Erfinder das Ziel gesetzt, eine elektromagnetische Stranggiesskokille der eingangs erwähnten Art derart weiterzuentwickeln, dass ein Auslaufen der Stränge beim Angiessen, unter Inkaufnahme einer minimalen Schmelzezirkulation im flüssigen Kopf des Giessstranges, verhindert werden kann.In view of these circumstances, the inventor has set himself the goal of further developing an electromagnetic continuous casting mold of the type mentioned at the outset in such a way that the strands can be prevented from escaping during casting, while accepting a minimal melt circulation in the liquid head of the casting strand.

Zur Lösung dieser Aufgabe führt, dass der Schirm an den Schmalseiten der Kokille derart angeordnet oder ausgebildet ist, dass die auf den flüssigen Kopf des Stranges ge­richtete elektromagnetische Kraft an den Schmalseiten der Kokille grösser ist als an deren Breitseiten.To achieve this object, the screen is arranged or designed on the narrow sides of the mold in such a way that the electromagnetic force directed at the liquid head of the strand is greater on the narrow sides of the mold than on the broad sides thereof.

Durch diese Massnahme wird die zur Strangmitte gerichtete elektromagnetische Kraft an den Schmalseiten der Kokille erhöht, so dass eine gewisse Strangfussverwölbung in Kauf genommen werden kann, ohne dass die Gefahr eines Auslaufens des Stranges auf dessen Schmalseiten besteht. Der Giess­prozess ist damit während des Anfahrvorgangs sicherer. Die Schmelzezirkulation im flüssigen Kopf des Giessstranges wird hierbei nur geringfügig erhöht. Insbesondere ermög­licht die erfindungsgemässe Ausbildung der Kokille ein Giessen grossformatiger Walzbarren aus Aluminiumlegierungen mit Magnesiumgehalten von 4 % und mehr.This measure increases the electromagnetic force directed towards the middle of the strand on the narrow sides of the mold, so that a certain strand root warping can be accepted without the risk of the strand running out on its narrow sides. The casting process is therefore safer during the start-up process. The melt circulation in the liquid head of the casting strand is only slightly increased. In particular, the design of the mold according to the invention enables casting of large-sized rolled bars made of aluminum alloys with magnesium contents of 4% and more.

Bei einer erfindungsgemässen Ausführungsform ist der verti­kale Abstand zwischen Induktorunterkante und Schirmunter­kante an den Schmalseiten der Kokille grösser als an deren Breitseiten.In one embodiment according to the invention, the vertical distance between the lower edge of the inductor and the lower edge of the screen is greater on the narrow sides of the mold than on the broad sides thereof.

Bei einer bevorzugten Ausführungsform liegen die Schirmun­terkanten an den Breit- und Schmalseiten der Kokille auf gleicher Höhe, wobei der Induktor an den Breitseiten der Kokille höher angeordnet ist als an deren Schmalseiten. Die blosse Verschiebung der Lage des Induktors bietet den Vor­ teil, dass die üblicherweise durch die Innenfläche des elektromagnetischen Schirmes bestimmte Auftrefflinie des Kühlmittels auf den Strangumfang unverändert bleibt.In a preferred embodiment, the lower edges of the screen lie on the broad and narrow sides of the mold at the same height, the inductor being arranged higher on the broad sides of the mold than on its narrow sides. The mere shift in the position of the inductor offers the advantage partly that the line of impact of the coolant on the strand circumference, which is usually determined by the inner surface of the electromagnetic screen, remains unchanged.

Bei einer weiteren Ausführungsform ist der Induktor an den Breit- und Schmalseiten der Kokille auf gleicher Höhe ange­ordnet, wobei die Schirmunterkanten an den Schmalseiten der Kokille höher liegen als an deren Breitseiten.In a further embodiment, the inductor is arranged on the broad and narrow sides of the mold at the same height, the lower edges of the screen being higher on the narrow sides of the mold than on the broad sides thereof.

Die Differenz des vertikalen Abstands zwischen Schirmunter­kante und Induktorunterkante an den Breitseiten zum verti­kalen Abstand zwischen Schirmunterkante und Induktorunter­kante an den Schmalseiten der Kokille beträgt bevorzugt ma­ximal 70 %, vorzugsweise 10 - 30 %, der Vertikalabmessung des Induktors.The difference between the vertical distance between the lower edge of the screen and the lower edge of the inductor on the broad sides compared to the vertical distance between the lower edge of the screen and the lower edge of the inductor on the narrow sides of the mold is preferably at most 70%, preferably 10-30%, of the vertical dimension of the inductor.

Bei einer weiteren erfindungsgemässen Ausführungsform weist der Schirm an den Schmalseiten der Kokille querschnittlich eine andere Geometrie oder eine andere elektrische Leit­fähigkeit auf als an deren Breitseiten.In a further embodiment according to the invention, the screen has a different cross-section on the narrow sides of the mold or a different electrical conductivity than on the broad sides thereof.

Die erfindungsgemässe Anordnung von Induktor und elektro­magnetischem Schirm bezieht sich selbstverständlich nicht nur auf Kokillen mit fest vorgegebenem Giessquerschnitt, sondern eignet sich in besonderem Masse auch für Kokillen mit veränderbarem Giessquerschnitt, d.h. beispielsweise für eine Kokille mit stationären Seitenwänden und verschiebba­ren Stirnwänden, wie sie etwa aus der EP-A-0 109 357 be­kannt ist.The arrangement of inductor and electromagnetic shield according to the invention naturally does not only relate to molds with a fixed casting cross-section, but is also particularly suitable for molds with a variable casting cross-section, i.e. for example for a mold with stationary side walls and sliding end walls, as is known for example from EP-A-0 109 357.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines be­vorzugten Ausführungsbeispiels sowie anhand der Zeichnung; diese zeigt in ihrer einzigen Figur einen schematisierten Querschnitt durch eine Kokillenseitenwand.Further advantages, features and details of the invention result from the following description of a preferred exemplary embodiment and from the drawing; in its single figure, this shows a schematic cross section through a mold side wall.

Eine Kokille 1 weist einen Kühlmittelkasten 2 auf, an wel­chem mittels Schrauben 3 ein Tragkörper 4 aus elektrisch isolierendem Werkstoff befestigt ist. Diesem Tragkörper 4 liegt ein von Schrauben 5 gehaltener, schleifenförmiger Induktor 6 an, der rückseitig einen rohrförmigen Kühlkanal 7 zur Aufnahme eines Kühlmittels aufweist. Am Kühlmittel­kasten 2 ist mittels Schrauben 8 ein nach unten sich ver­jüngender elektromagnetischer Schirm 9 aus einem elektrisch leitenden, nicht-ferromagnetischen Werkstoff befestigt. Schirm 9 und Induktor 6 erzeugen einen Spalt 10, aus wel­chem Kühlmittel von einer Kühlmittelkammer 11 über einen Kanal 12 auf die Oberfläche eines - in der Figur nicht dar­gestellten - Giessstranges geleitet wird.A mold 1 has a coolant box 2, on which by means of screws 3 a support body 4 made of electrical insulating material is attached. This supporting body 4 is in contact with a loop-shaped inductor 6, which is held by screws 5 and has a tubular cooling channel 7 on the back for receiving a coolant. On the coolant box 2, a downwardly tapering electromagnetic screen 9 made of an electrically conductive, non-ferromagnetic material is fastened by means of screws 8. Screen 9 and inductor 6 create a gap 10, from which coolant is passed from a coolant chamber 11 via a channel 12 to the surface of a casting strand (not shown in the figure).

Bei einer Vertikalabmessung h des Induktors 6 von 40 mm be­trägt der vertikale Abstand zwischen Schirmunterkante und Induktorunterkante beispielsweise an den Breitseiten der Kokille a = 25 mm und an den Schmalseiten b = 35 mm. Daraus ergibt sich ein Unterschied in den vertikalen Abständen a, b von 10 mm, entsprechend 25 % bezogen auf die Vertikal­abmessung h des Induktors.With a vertical dimension h of the inductor 6 of 40 mm, the vertical distance between the lower edge of the screen and the lower edge of the inductor is, for example, a = 25 mm on the broad sides of the mold and b = 35 mm on the narrow sides. This results in a difference in the vertical distances a, b of 10 mm, corresponding to 25% based on the vertical dimension h of the inductor.

Claims (7)

1. Elektromagnetische Stranggiesskokille zum vertikalen Giessen von Walzbarren, mit einem Induktor (6) und ei­nem diesen teilweise überdeckenden elektromagnetischen Schirm (9), wobei der Schirm (9) in bezug auf den Induktor (6) an den Breitseiten der Kokille (1) derart angeordnet ist, dass die elektromagnetische Turbulenz im flüssigen Kopf des Stranges minimal ist,

dadurch gekennzeichnet,

dass der Schirm (9) an den Schmalseiten der Kokille (1) derart angeordnet oder ausgebildet ist, dass die auf den flüssigen Kopf des Stranges gerichtete elektroma­gnetische Kraft an den Schmalseiten der Kokille (1) grösser ist als an deren Breitseiten.1. Electromagnetic continuous casting mold for the vertical casting of rolled ingots, with an inductor (6) and an electromagnetic screen (9) partially covering this, the screen (9) in relation to the inductor (6) on the broad sides of the mold (1) in this way is arranged that the electromagnetic turbulence in the liquid head of the strand is minimal,

characterized,

that the screen (9) is arranged or designed on the narrow sides of the mold (1) in such a way that the electromagnetic force directed at the liquid head of the strand is greater on the narrow sides of the mold (1) than on the broad sides thereof. 2. Kokille nach Anspruch 1, dadurch gekennzeichnet, dass der vertikale Abstand (a, b) zwischen Induktorunterkan­te und Schirmunterkante an den Schmalseiten der Kokille (1) grösser ist als an deren Breitseiten.2. Mold according to claim 1, characterized in that the vertical distance (a, b) between the lower edge of the inductor and the lower edge of the screen is greater on the narrow sides of the mold (1) than on the broad sides thereof. 3. Kokille nach Anspruch 2, dadurch gekennzeichnet, dass die Schirmunterkanten an den Breit- und Schmalseiten der Kokille (1) auf gleicher Höhe liegen und der Induk­tor (6) an den Breitseiten der Kokille (1) höher ange­ordnet ist als an deren Schmalseiten.3. Chill mold according to claim 2, characterized in that the lower edges of the screen on the broad and narrow sides of the mold (1) are at the same height and the inductor (6) on the broad sides of the mold (1) is arranged higher than on its narrow sides. 4. Kokille nach Anspruch 2, dadurch gekennzeichnet, dass der Induktor (6) an den Breit- und Schmalseiten der Ko­kille (1) auf gleicher Höhe angeordnet ist und die Schirmunterkanten an den Schmalseiten der Kokille (1) höher liegen als an deren Breitseiten.4. Mold according to claim 2, characterized in that the inductor (6) on the wide and narrow sides of the mold (1) is arranged at the same height and the lower edges of the screen on the narrow sides of the mold (1) are higher than on the broad sides. 5. Kokille nach einem der Ansprüche 2 bis 4, dadurch ge­kennzeichnet, dass die Differenz des vertikalen Ab­ stands (a) zwischen Schirmunterkante und Induktorunter­kante an den Breitseiten zum vertikalen Abstand (b) zwischen Schirmunterkante und Induktorunterkante an den Schmalseiten der Kokille (1) maximal 70 %, vorzugsweise 10 - 30 %, der Vertikalabmessung (h) des Induktors (6) beträgt.5. Chill mold according to one of claims 2 to 4, characterized in that the difference of the vertical Ab stands (a) between the lower edge of the screen and the lower edge of the inductor on the broad sides to the vertical distance (b) between the lower edge of the screen and the lower edge of the inductor on the narrow sides of the mold (1) is a maximum of 70%, preferably 10-30%, of the vertical dimension (h) of the inductor (6) . 6. Kokille nach Anspruch 1, dadurch gekennzeichnet, dass der Schirm (9) an den Schmalseiten der Kokille (1) querschnittlich eine andere Geometrie aufweist als an deren Breitseiten.6. Mold according to claim 1, characterized in that the screen (9) on the narrow sides of the mold (1) has a different cross-sectional geometry than on its broad sides. 7. Kokille nach Anspruch 1, dadurch gekennzeichnet, dass der Schirm (9) an den Schmalseiten der Kokille (1) eine andere elektrische Leitfähigkeit aufweist als an deren Breitseiten.7. Mold according to claim 1, characterized in that the screen (9) on the narrow sides of the mold (1) has a different electrical conductivity than on the broad sides.
EP88810179A 1987-03-23 1988-03-21 Electromagnetic continuous casting mould Expired - Lifetime EP0284565B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810179T ATE56897T1 (en) 1987-03-23 1988-03-21 ELECTROMAGNETIC CONTINUOUS CASTING MOLD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1095/87 1987-03-23
CH109587 1987-03-23

Publications (2)

Publication Number Publication Date
EP0284565A1 true EP0284565A1 (en) 1988-09-28
EP0284565B1 EP0284565B1 (en) 1990-09-26

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EP88810179A Expired - Lifetime EP0284565B1 (en) 1987-03-23 1988-03-21 Electromagnetic continuous casting mould

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US (1) US4796689A (en)
EP (1) EP0284565B1 (en)
JP (1) JPS63252644A (en)
AT (1) ATE56897T1 (en)
AU (1) AU607748B2 (en)
CA (1) CA1315521C (en)
DE (1) DE3860676D1 (en)
ES (1) ES2018356B3 (en)
NO (1) NO168460C (en)
ZA (1) ZA881861B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0553597A1 (en) * 1992-01-30 1993-08-04 Alusuisse-Lonza Services Ag Electromagnetic continuous casting mould

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015870A1 (en) * 1979-03-07 1980-09-17 Schweizerische Aluminium AG Electro-magnetic mould for continuous casting
EP0022649A2 (en) * 1979-07-11 1981-01-21 Olin Corporation Process and apparatus for the electromagnetic casting of metals and non-magnetic screen for use therein
EP0109357A1 (en) * 1982-11-12 1984-05-23 Schweizerische Aluminium Ag Electromagnetic continuous casting mould
US4544016A (en) * 1983-04-21 1985-10-01 Yetselev Zinovy N Continuous casting process and apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH625441A5 (en) * 1977-12-05 1981-09-30 Alusuisse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015870A1 (en) * 1979-03-07 1980-09-17 Schweizerische Aluminium AG Electro-magnetic mould for continuous casting
EP0022649A2 (en) * 1979-07-11 1981-01-21 Olin Corporation Process and apparatus for the electromagnetic casting of metals and non-magnetic screen for use therein
EP0109357A1 (en) * 1982-11-12 1984-05-23 Schweizerische Aluminium Ag Electromagnetic continuous casting mould
US4544016A (en) * 1983-04-21 1985-10-01 Yetselev Zinovy N Continuous casting process and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0553597A1 (en) * 1992-01-30 1993-08-04 Alusuisse-Lonza Services Ag Electromagnetic continuous casting mould

Also Published As

Publication number Publication date
US4796689A (en) 1989-01-10
ATE56897T1 (en) 1990-10-15
CA1315521C (en) 1993-04-06
NO881235D0 (en) 1988-03-21
ZA881861B (en) 1988-09-05
NO168460C (en) 1992-02-26
AU1351388A (en) 1988-09-22
NO168460B (en) 1991-11-18
AU607748B2 (en) 1991-03-14
ES2018356B3 (en) 1991-04-01
JPS63252644A (en) 1988-10-19
DE3860676D1 (en) 1990-10-31
EP0284565B1 (en) 1990-09-26
NO881235L (en) 1988-09-26

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