EP0015870A1 - Electro-magnetic mould for continuous casting - Google Patents

Electro-magnetic mould for continuous casting Download PDF

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Publication number
EP0015870A1
EP0015870A1 EP80810055A EP80810055A EP0015870A1 EP 0015870 A1 EP0015870 A1 EP 0015870A1 EP 80810055 A EP80810055 A EP 80810055A EP 80810055 A EP80810055 A EP 80810055A EP 0015870 A1 EP0015870 A1 EP 0015870A1
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EP
European Patent Office
Prior art keywords
profile
coolant
mold according
casting
induction coil
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Granted
Application number
EP80810055A
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German (de)
French (fr)
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EP0015870B1 (en
Inventor
Walter Haller
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Alcan Holdings Switzerland AG
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Alusuisse Holdings AG
Schweizerische Aluminium AG
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Priority to AT80810055T priority Critical patent/ATE1134T1/en
Publication of EP0015870A1 publication Critical patent/EP0015870A1/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 with a support body for an induction coil and a cooling device which has at least one cooling nozzle for a liquid coolant directed onto the surface of the casting strand.
  • the surface quality of the product depends crucially on the level at which the liquid coolant used hits the surface of the casting strand that solidifies during lowering.
  • the inventor set himself the task of creating a continuous casting mold of the type mentioned at the outset, which effortlessly permits fine regulation of the angle of incidence between the coolant jet and the casting strand surface - and this independently of the electromagnetic field of the continuous casting mold which may need correction.
  • a differentiation of the impact area over the strand sides, which increases the cooling effect should be made possible.
  • the nozzle opening (s) designed as an annular gap is followed by a profile in the flow direction of the coolant, which protrudes into the path of the coolant jet emerging from the annular gap with a curved or exchangeable baffle surface inclined towards the casting direction. This surrounds the resulting casting strand and directs the liquid coolant jet emerging from the annular gap in a different direction, so that the height and angle at which the coolant strikes the casting strand are subsequently changed.
  • the radial cross section of the deflection profile or the support can advantageously be given the shape of a suitable curve segment (for example a parabolic segment), as a result of which the coolant jet also has the shape of such a segment Curve takes and the device constructive applications are opened up, which are not given with a linear or flat coolant jet.
  • a suitable curve segment for example a parabolic segment
  • the profile and the support consist of an electrically insulating plastic, preferably a glass fiber reinforced epoxy plastic, in order not to influence the magnetic field. It is also within the scope of the invention to form a profile and / or support by means of a metallic hollow profile. In order to achieve an even solidification of the casting strand, it can be useful, especially with large-sized, rectangular cross-sections, to change the impact area - and thus the impact angle - on the casting strand in such a way that the intersections between the coolant film and the casting strand are not in a horizontal plane.
  • the baffle surface on each side should be designed such that, viewed in the view, it represents a curvature with a central apex.
  • the casting strand is later cooled at its corners - that is, further down and at a smaller angle, preferably less than 20 ° - than in the center of the individual side surfaces.
  • an induction coil 1 formed in the exemplary embodiments shown by a hollow profile, is placed around a casting opening for a casting strand 10.
  • This is mounted on a multi-part support body 2, 3 formed from insulating material, preferably plastic, which has corresponding recesses on its inside for receiving the induction coil 1.
  • the upper support body 3 is connected to a metallic cover 4 and delimits cavities for a flowing coolant.
  • An electromagnetic shield which is connected to the cover 4 by a screw thread, is used to adapt the magnetic field to the increasing metallostatic pressure in the casting strand 10, and a selected position of the shield 5 can be fixed by locking screws 6.
  • this screen 5 is preceded by a jacket 7 made of refractory, insulating material towards the pouring opening.
  • an insulating body 8 is attached, which together with the outer surface of the electromagnetic shield 5 forms an annular gap 13 through which coolant 14 is sprayed onto the casting strand 10.
  • the coolant is introduced into the cavity formed by the upper support body 3 and its cover 4, then flows through various fluid dynamic calming elements - for example reproduced sieve plates 9 with holes 11 - and a collar-like weir 12 and then passes through the annular gap 13 at a predetermined angle Axis M of the casting strand 10, which is given by the function of the screen 5 for adapting the magnetic field to the metallostatic pressure in the casting strand.
  • a profile 15 protrudes into the flow path of the coolant 14 emerging from the annular gap 13, one surface of which represents a deflecting element as a baffle or impact surface for the coolant. Its angle of inclination to the casting strand axis M is determined by the deflection of the coolant 14 to be achieved, its inner contour is adapted to the cross-sectional contour of the casting strand 10.
  • This deflection profile 15 is inserted into the corresponding shoulders or recesses 16 of the induction coil 1 or of the / the support body (s) 2, 3 in the sliding fit. The sliding fit is ensured at changing temperatures by selecting materials with comparable coefficients of thermal expansion for the abutting workpieces of the deflection profile 15 and the induction coil 1 or the support body 2, 3.
  • the deflection profile 15 can be secured against rotation about the axis M by arranging tongue and groove between the induction coil 1 or support body 2, 3 on the one hand and deflection profile 15 on the other hand; alternatively, the profile 15 - by name, if it is made of a thin metal sheet - can be anchored between the top of the induction coil 1 on the one hand and the supporting body 3 or insulating body 8 on the other.
  • the sequence of the individual steps when assembling the device also changes in accordance with the different embodiments: if the deflection profile 15 rests on the lower support body 2, these two pieces 15, 2 are first assembled and then the induction coil 1 is attached. However, if the deflection profile 15 is provided in the induction coil 1 itself, the support bodies 2, 3 are first joined together, and only then is the deflection profile 15 fitted.
  • the profile 15 is anchored between the induction coil 1 and the support body 3, then that is first fitted onto the upper edge of the induction coil 1 and fixed by the subsequent attachment of the support body 3 and the insulating support 8.
  • the shape of the cross section of the deflection profile 15 is in itself predetermined by its function. 2 depends on the type of material selected in the individual case and the prevailing geometrical conditions in the continuous casting installation used.
  • a particularly rapid change in the point of impact of the coolant 14 on the casting strand 10 in accordance with the changing operational tasks can be achieved in that it is not the profile 15 itself which deflects the jet of the coolant 14 but a support 17 which offers the baffle surface and which only supports the profile 15 as a base serves.
  • the geometry of this support 17 can then be selected differently accordingly.
  • not only flat pieces but also curve segments - as shown in FIG. 3 - can be used, thereby opening up additional application possibilities for the device.
  • the angle between the coolant jet and the surface of the casting strand 10 to be cooled expediently varies between 8 and 50 °.
  • angles between 15 and 30 ° have been found to be optimal.
  • the profile 15 of each of the device sides according to FIGS. 4, 5 can have a curvature with a central apex 20 in the respective side view, so that the line of impact for the coolant 14 on the casting strand 10 in Giessrich device is bent towards the side ends 21.
  • the materials for the deflection profile 15 or the support 17 are primarily electrically insulating materials which have a temperature resistance and a thermal expansion coefficient which is comparable to that of the induction coil 1 or the support body 2, 3 on which the deflection profile 15 sits in individual cases.
  • glass fiber reinforced epoxy plastics with low hygroscopic properties have proven to be particularly suitable. If 15 metallic materials are used for the deflection profile, the electromagnetic alternating field may be disturbed by them to the lowest possible extent. This requirement can either be met by a profile 15 in a metallic hollow construction or by a profile 15 in which only the support 17 consists of a thin metallic sheet.
  • the profile or deflection profile 15 can be of different cross-section in the different embodiments; for example in an embodiment not shown, a profiled sheet as profile 15 is clamped on the one hand between support body 3 and induction coil 1 and protrudes toward the casting strand 10 to form the inclined baffle surface.

Abstract

A mold for electromagnetic continuous casting has a supporting frame for an induction coil and a cooling device which features at least one nozzle for directing a liquid coolant onto the surface of the ingot being cast. A section (15) is provided in line with the stream of liquid coolant emerging from at least one nozzle such that it provides an impacting surface for deflecting the stream of coolant onto the surface of the ingot.

Description

Die Erfindung betrifft eine elektromagnetische Stranggiesskokille mit einem Tragkörper für eine Induktionsspule sowie einer Kühlvorrichtung, die wenigstens eine auf die Oberfläche des Giessstranges gerichtete Kühldüse für ein flüssiges Kühlmittel aufweist.The invention relates to an electromagnetic continuous casting mold with a support body for an induction coil and a cooling device which has at least one cooling nozzle for a liquid coolant directed onto the surface of the casting strand.

Beim vertikalen Stranggiessen von Metallen im hochfrequenten elektromagnetischen Wechselfeld hängt die Oberflächenbeschaffenheit des Produktes in entscheidender Weise davon ab, in welcher Höhe das eingesetzte flüssige Kühlmittel auf die Oberfläche des während des Absenkens erstarrenden Giessstranges auftrifft.In the case of vertical continuous casting of metals in the high-frequency electromagnetic alternating field, the surface quality of the product depends crucially on the level at which the liquid coolant used hits the surface of the casting strand that solidifies during lowering.

Durch die DE-OS 2 202 910 ist es bekannt, das flüssige Kühlmittel durch einen Schlitz als Kühldüse zum Giessstrang zu leiten. Aus dieser Kühldüse tritt das Kühlmittel in schrägem Strahl zur Oberfläche des Giessstranges aus und trifft diese in einem Winkel zu seiner Hauptachse bzw. zur Giessrichtung, der -- wie auch die sog. Auftreffhöhe -- für alle Giessvorgänge gleich bleibt; die festliegende Neigung jenes Schlitzes bestimmt auch die endgültige Strahlrichtung.From DE-OS 2 202 910 it is known to pass the liquid coolant through a slot as a cooling nozzle to the casting strand. From this cooling nozzle, the coolant emerges in an oblique jet to the surface of the casting strand and hits it at an angle to its main axis or to the casting direction, which - like the so-called impact height - remains the same for all casting processes; the fixed inclination of that slit also determines the final beam direction.

So hat sich der Erfinder die Aufgabe gestellt, eine Stranggiesskokille der eingangs erwähnten Art zu schaffen, welche mühelos eine feine Regulierung des Auftreffwinkels zwischen Kühlmittelstrahl und Giessstrangoberfläche erlaubt - und dies unabhängig von dem gegebenenfalls korrekturbedürftigen elektromagnetischen Feld der Stranggiesskokille. Darüber hinaus soll vor allem bei grossformatigen Strängen eine die Kühlwirkung erhöhende Differenzierung des Auftreffbereiches über die Strangseiten hin ermöglicht werden.Thus, the inventor set himself the task of creating a continuous casting mold of the type mentioned at the outset, which effortlessly permits fine regulation of the angle of incidence between the coolant jet and the casting strand surface - and this independently of the electromagnetic field of the continuous casting mold which may need correction. In addition, especially with large-sized strands, a differentiation of the impact area over the strand sides, which increases the cooling effect, should be made possible.

- Zur Lösung dieser Aufgabe führt, dass der/den als Ringspalt ausgebildeten Düsenöffnung/en in Strömungsrichtung des Kühlmittels ein Profil nachgeschaltet ist, welches in die Bahn des aus dem Ringspalt austretenden Kühlmittelstrahles mit einer gekrümmten oder zur Giessrichtung geneigten auswechselbaren Prallfläche einragt. Diese umgibt den entstehenden Giessstrang und lenkt den aus dem Ringspalt austretenden flüssigen Kühlmittelstrahl in eine andere Richtung, so dass Höhe und Winkel, unter denen das Kühlmittel auf den Giessstrang auftrifft, nachträglich verändert werden.- To achieve this object, the nozzle opening (s) designed as an annular gap is followed by a profile in the flow direction of the coolant, which protrudes into the path of the coolant jet emerging from the annular gap with a curved or exchangeable baffle surface inclined towards the casting direction. This surrounds the resulting casting strand and directs the liquid coolant jet emerging from the annular gap in a different direction, so that the height and angle at which the coolant strikes the casting strand are subsequently changed.

Es handelt sich um ein konstruktiv selbständiges -- gegebenenfalls im Gleitsitz in einer Ausnehmung der Induktionsspule und/oder des Tragkörpers angebrachtes -- Profil, dank dessen Auftreffpunkt und Auftreffwinkel des Kühlmittels auf den Ciessstrang ohne Rücksicht auf die Korrektur des metallostatischen Druckes im Giessstrang optimal ausgewählt werden können, ohne dabei das Magnetfeld wesentlich zu stören, was vor allem das Giessen von Speziallegierungen erlaubt.It is a structurally independent profile - possibly fitted in a sliding fit in a recess of the induction coil and / or the supporting body - thanks to which the point of impact and angle of impact of the coolant on the caster strand are optimally selected regardless of the correction of the metallostatic pressure in the cast strand can without significantly disturbing the magnetic field, which above all allows the casting of special alloys.

Als besonders günstig hat sich auch erwiesen, als Prallfläche für das Kühlmittel auf dem Profil eine auswechselbare Auflage anzubringen. Die leichte Auswechselbarkeit von Umlenkprofil oder Auflage gestattet es weiter, eine bestehende elektromagnetische Stranggiessanlage mit wenigen Handgriffen für andere Giesslegierungen bzw. Absenkgeschwindigkeiten (Giessgeschwindigkeiten) umzurüsten, wozu bislang die Verwendung eines anderen Metallschirmes und die Veränderung der gesamten Kühlmitteleinleitvorrichtung erforderlich sind.It has also proven to be particularly favorable to mount an interchangeable support as an impact surface for the coolant on the profile. The easy interchangeability of the deflection profile or support also allows an existing continuous electromagnetic casting system to be converted in a few simple steps for other casting alloys or lowering speeds (casting speeds), for which previously the use of a different metal screen and the change of the entire coolant introduction device had been necessary.

Vorteilhafterweise kann dem radialen Querschnitt des Umlenkprofiles oder der Auflage die Form eines geeigneten Kurvensegments (beispielsweise eines Parabelsegments) gegebenwerden wodurch auch der Kühlmittelstrahl die Form einer derartigen Kurve annimmt und der Vorrichtung konstruktive Anwendungsmöglichkeiten erschlossen werden, die bei einem linear bzw. eben verlaufenden Kühlmittelstrahl nicht gegeben sind.The radial cross section of the deflection profile or the support can advantageously be given the shape of a suitable curve segment (for example a parabolic segment), as a result of which the coolant jet also has the shape of such a segment Curve takes and the device constructive applications are opened up, which are not given with a linear or flat coolant jet.

Nach einem weiteren Merkmal der Erfindung bestehen das Profil und die Auflage aus einem elektrisch isolierenden Kunststoff, vorzugsweise einem glasfaserverstärktem Epoxidkunststoff, um das magnetische Feld nicht zu beeinflussen. Auch liegt es im Rahmen der Erfindung, Profil und/oder Auflage mittels eines metallischen Hohlprofils zu bilden. Um ein gleichmässiges Erstarren des Giessstranges zu erreichen, kann es vor allem bei grossformatigen, rechteckigen Querschnitten zweckmässig sein, den Auftreffbereich -- und damit den Auftreffwinkel -auf den Giessstrang so zu verändern, dass die Schnittpunkte zwischen Kühlmittelfilm und Giessstrang nicht in einer Horizontalebene liegen. Deshalb soll erfindungsgemäss bei einer rechteckigen Stranggiesskokille die Prallfläche jeder Seite so ausgebildet sein, dass sie in der Ansicht gesehen eine Wölbung mit mittigem Scheitelpunkt darstellt. Dadurch wird der Giessstrang an seinen Ecken später -- das heisst: weiter unten und unter kleinerem Winkel, vorzugsweise weniger als 20° -- gekühlt als im Zentrum der einzelnen Seitenflächen.According to a further feature of the invention, the profile and the support consist of an electrically insulating plastic, preferably a glass fiber reinforced epoxy plastic, in order not to influence the magnetic field. It is also within the scope of the invention to form a profile and / or support by means of a metallic hollow profile. In order to achieve an even solidification of the casting strand, it can be useful, especially with large-sized, rectangular cross-sections, to change the impact area - and thus the impact angle - on the casting strand in such a way that the intersections between the coolant film and the casting strand are not in a horizontal plane. Therefore, according to the invention, in the case of a rectangular continuous casting mold, the baffle surface on each side should be designed such that, viewed in the view, it represents a curvature with a central apex. As a result, the casting strand is later cooled at its corners - that is, further down and at a smaller angle, preferably less than 20 ° - than in the center of the individual side surfaces.

In der Zeichnung sind verschiedene Ausführungsformen des Gegenstandes der Erfindung beispielhaft dargestellt, die nachfolgend beschrieben werden; es zeigt:

  • Fig. l: einen Querschnitt durch einen Teil einer Stranggiesskokille mit einer Kühlvorrichtung;
  • Fig. 2 weitere Ausführungsbeispiele zu einem Ausschnitt A und 3: der Fig. 1;
  • Fig. 4: eine schematisierte Schrägsicht auf ein Detail der Kühlvorrichtung;
  • Fig. 5: den Querschnitt durch das Detail der Fig. 4 nach deren Linie V - V.
Various embodiments of the subject matter of the invention are shown by way of example in the drawing and are described below; it shows:
  • 1: a cross section through part of a continuous casting mold with a cooling device;
  • FIG. 2 further exemplary embodiments of a section A and 3: FIG. 1;
  • 4 shows a schematic oblique view of a detail of the cooling device;
  • 5: the cross section through the detail of FIG. 4 along the line V - V.

Bei einer elektromagnetischen Stranggiesskokille ist um eine Giessöffnung für einen Giessstrang 10 eine -- in den dargestellten Ausführungsbeispielen von einem Hohlprofil gebildete -- Induktionsspule 1 gelegt. Diese ist an einem aus isolierendem Werkstoff, vorzugsweise Kunststoff, geformten mehrteiligen Tragkörper 2, 3 gelagert, der an seiner Innenseite entsprechende Ausnehmungen zur Aufnahme der Induktionsspule 1 aufweist. Der obere Tragkörper 3 ist mit einem metallischen Deckel 4 verbunden, und begrenzt mit diesem Hohlräume für ein fliessendes Kühlmittel.In the case of an electromagnetic continuous casting mold, an induction coil 1, formed in the exemplary embodiments shown by a hollow profile, is placed around a casting opening for a casting strand 10. This is mounted on a multi-part support body 2, 3 formed from insulating material, preferably plastic, which has corresponding recesses on its inside for receiving the induction coil 1. The upper support body 3 is connected to a metallic cover 4 and delimits cavities for a flowing coolant.

Zur Anpassung des Magnetfeldes an den zunehmenden metallostatischen Druck im Giessstrang 10 dient ein elektromagnetischer Schirm, der mit dem Deckel 4 durch ein Schraubgewinde verbunden ist, wobei eine einmal gewählte Lage des Schirmes 5 durch Feststellschrauben 6 fixiert werden kann. Diesem Schirm 5 ist in den Ausführungsformen nach den Figuren 1 und 2 zur Giessöffnung hin ein Mantel 7 aus feuerfestem, isolierendem Werkstoff vorgeschaltet.An electromagnetic shield, which is connected to the cover 4 by a screw thread, is used to adapt the magnetic field to the increasing metallostatic pressure in the casting strand 10, and a selected position of the shield 5 can be fixed by locking screws 6. In the embodiments according to FIGS. 1 and 2, this screen 5 is preceded by a jacket 7 made of refractory, insulating material towards the pouring opening.

An der Innenseite des oberen Tragkörpers 3 ist ein Isolierkörper 8 angebracht, der zusammen mit der Aussenfläche des elektromagnetischen Schirmes 5 einen Ringspalt 13 bildet, durch den Kühlmittel 14 auf den Giessstrang 10 gespritzt wird. Das Kühlmittel wird in den vom oberen Tragkörper 3 und seinem Deckel 4 gebildeten Hohlraum eingeleitet, durchströmt anschliessend verschiedene strömungsdynamische Beruhigungselemente -- beispielsweise wiedergegebene Siebplatten 9 mit Löchern 11 -- sowie ein kragenartiges Wehr 12 und tritt dann durch den Ringspalt 13 in einem vorbestimmten Winkel zur Achse M des Giessstranges 10 aus, der durch die Funktion des Schirmes 5 zur Anpassung des Magnetfeldes an den metallostatischen Druck im Giessstrang gegeben ist.On the inside of the upper support body 3, an insulating body 8 is attached, which together with the outer surface of the electromagnetic shield 5 forms an annular gap 13 through which coolant 14 is sprayed onto the casting strand 10. The coolant is introduced into the cavity formed by the upper support body 3 and its cover 4, then flows through various fluid dynamic calming elements - for example reproduced sieve plates 9 with holes 11 - and a collar-like weir 12 and then passes through the annular gap 13 at a predetermined angle Axis M of the casting strand 10, which is given by the function of the screen 5 for adapting the magnetic field to the metallostatic pressure in the casting strand.

In die Strömungsbahn des aus dem Ringspalt 13 austretenden Kühlmittels 14 ragt ein Profil 15 ein, dessen eine Oberfläche als Prall- oder Auftreffläche für das Kühlmittel ein Umlenkorgan darstellt. Dessen Neigungswinkel zur Giessstrangachse M wird von der zu erzielenden Umlenkung des Kühlmittels 14 bestimmt, seine Innenkontur ist der Querschnittskontur des Giessstranges 10 angepasst. Dieses Umlenkprofil 15 wird im Gleitsitz in entsprechende Absätze oder Ausnehmungen 16 der Induktionsspule 1 oder der/des Tragkörper/s 2, 3 eingesetzt. Der Gleitsitz wird bei wechselnden Temperaturen dadurch gewährleistet, dass für die aneinanderstossenden Werkstücke des Umlenkprofils 15 und der Induktionsspule 1 bzw. des Tragkörpers 2, 3 Werkstoffe mit vergleichbaren thermischen Ausdehnungskoeffizienten ausgewählt werden. Falls erforderlich, kann das Umlenkprofil 15 durch Anordnung von Nut und Feder zwischen Induktionsspule 1 bzw. Tragkörper 2, 3 einerseits sowie Umlenkprofil 15 anderseits vor Verdrehen um die-Achse M gesichert werden; alternativ dazu kann das Profil 15 -namentlich, wenn es aus einem dünnen metallischen Blech gefertigt ist -- zwischen der Oberseite der Induktionsspule 1 einerseits und dem Tragkörper 3 bzw. Isolierkörper 8 anderseits verankert sein.A profile 15 protrudes into the flow path of the coolant 14 emerging from the annular gap 13, one surface of which represents a deflecting element as a baffle or impact surface for the coolant. Its angle of inclination to the casting strand axis M is determined by the deflection of the coolant 14 to be achieved, its inner contour is adapted to the cross-sectional contour of the casting strand 10. This deflection profile 15 is inserted into the corresponding shoulders or recesses 16 of the induction coil 1 or of the / the support body (s) 2, 3 in the sliding fit. The sliding fit is ensured at changing temperatures by selecting materials with comparable coefficients of thermal expansion for the abutting workpieces of the deflection profile 15 and the induction coil 1 or the support body 2, 3. If necessary, the deflection profile 15 can be secured against rotation about the axis M by arranging tongue and groove between the induction coil 1 or support body 2, 3 on the one hand and deflection profile 15 on the other hand; alternatively, the profile 15 - by name, if it is made of a thin metal sheet - can be anchored between the top of the induction coil 1 on the one hand and the supporting body 3 or insulating body 8 on the other.

Entsprechend den verschiedenen Ausführungsarten ändert sich auch die Reihenfolge der einzelnen Schritte beim Montieren der Vorrichtung: ruht das Umlenkprofil 15 auf dem unteren Tragkörper 2, so werden zunächst diese beiden Stücke 15, 2 zusammengebaut und anschliessend die Induktionsspule 1 angebracht. Ist das Umlenkprofil 15 jedoch in der Induktionsspule 1 selbst vorgesehen, so werden zunächst die Tragkörper 2, 3 mit dieser zusammengefügt, erst dann wird das Umlenkprofil 15 eingepasst.The sequence of the individual steps when assembling the device also changes in accordance with the different embodiments: if the deflection profile 15 rests on the lower support body 2, these two pieces 15, 2 are first assembled and then the induction coil 1 is attached. However, if the deflection profile 15 is provided in the induction coil 1 itself, the support bodies 2, 3 are first joined together, and only then is the deflection profile 15 fitted.

Ist das Profil 15 zwischen Induktionsspule 1 und Tragkörper 3 verankert, so wird jenes zunächst auf die Oberkante der Induktionsspule 1 eingepasst und durch das anschliessende Aufsetzen von Tragkörper 3 und Isolierträger 8 fixiert.If the profile 15 is anchored between the induction coil 1 and the support body 3, then that is first fitted onto the upper edge of the induction coil 1 and fixed by the subsequent attachment of the support body 3 and the insulating support 8.

Die Form des Querschnittes des Umlenkprofils 15 ist an sich durch dessen Funktion vorgegeben. Ob eine entsprechende Abschrägung der inneren Unterkante gemäss Fig. 2 vorgenommen wird, hängt von der Art des im Einzelfall gewählten Materials und den herrschenden geometrischen Verhältnissen in der verwendeten Stranggiessanlage ab.The shape of the cross section of the deflection profile 15 is in itself predetermined by its function. 2 depends on the type of material selected in the individual case and the prevailing geometrical conditions in the continuous casting installation used.

Eine besonders rasche Veränderung des Auftreffpunktes des Kühlmittels 14 auf den Giessstrang 10 entsprechend den wechselnden betrieblichen Aufgabenstellungen kann dadurch erzielt werden, dass nicht das Profil 15 selbst den Strahl des Kühlmittels 14 umlenkt sondern eine die Prallfläche anbietende Auflage 17, der das Profil 15 lediglich als Unterlage dient. Die Geometrie dieser Auflage 17 kann dann entsprechend unterschiedlich gewählt werden. Hierbei können nicht nur ebene Stücke sondern auch Kurvensegmente -- wie in Fig. 3 dargestellt -- verwendet und dadurch für die Vorrichtung zusätzliche Anwendungsmöglichkeiten erschlossen werden. So hat sich gezeigt, dass der Winkel zwischen dem Kühlmittelstrahl und der Oberfläche des zu kühlenden Giessstranges 10 zweckmässigerweise zwischen 8 und 50° variiert. Beim Giessen von Aluminium und dessen Legierungen in einem Wechselfeld von 2 bis 3 kHz und einer Absenkgeschwindigkeit des Giessstranges 10 von 7 cm/min haben sich Winkel zwischen 15 und 30° als optimal herausgestellt.A particularly rapid change in the point of impact of the coolant 14 on the casting strand 10 in accordance with the changing operational tasks can be achieved in that it is not the profile 15 itself which deflects the jet of the coolant 14 but a support 17 which offers the baffle surface and which only supports the profile 15 as a base serves. The geometry of this support 17 can then be selected differently accordingly. Here, not only flat pieces but also curve segments - as shown in FIG. 3 - can be used, thereby opening up additional application possibilities for the device. It has been shown that the angle between the coolant jet and the surface of the casting strand 10 to be cooled expediently varies between 8 and 50 °. When casting aluminum and its alloys in an alternating field of 2 to 3 kHz and a lowering speed of the casting strand 10 of 7 cm / min, angles between 15 and 30 ° have been found to be optimal.

Um ein gleichmässiges Erstarren eines Giessstranges 10 grossformatigen rechteckigen Querschnittes zu ermöglichen, kann das Profil 15 jeder der Vorrichtungsseiten gemäss Fig. 4, 5 in der jeweiligen Seitenansicht gesehen eine Wölbung mit mittigem Scheitelpunkt 20 aufweisen, so dass die Auftrefflinie für das Kühlmittel-14 am Giessstrang 10 in Giessrichtung zu den Seitenenden 21 hin gebogen ist.In order to enable a uniform solidification of a casting strand 10 of large-format rectangular cross-section, the profile 15 of each of the device sides according to FIGS. 4, 5 can have a curvature with a central apex 20 in the respective side view, so that the line of impact for the coolant 14 on the casting strand 10 in Giessrich device is bent towards the side ends 21.

Als Werkstoffe für das Umlenkprofil 15 bzw. die Auflage 17 kommen in erster Linie elektrisch isolierende Materialien in Frage, welche eine Temperaturbeständigkeit und einen thermischen Ausdehnungskoeffizienten aufweisen, der demjenigen der Induktionsspule 1 bzw. des Tragkörpers 2, 3 vergleichbar ist, an dem das Umlenkprofil 15 im Einzelfall sitzt. Als besonders geeignet haben sich in der betrieblichen Praxis glasfaserverstärkte Epoxidkunststoffe mit geringen hygroskopischen Eigenschaften erwiesen. Werden für das Umlenkprofil 15 metallische Werkstoffe verwendet, so darf durch sie das elektromagnetische Wechselfeld in möglichst geringem Mass getört werden. Dieser Forderung kann entweder durch ein Profil 15 in metallischer Hohlkonstruktion Rechnung getragen werden oder durch ein Profil 15, bei dem nur die Auflage 17 aus einem dünnen metallischen Blech besteht.The materials for the deflection profile 15 or the support 17 are primarily electrically insulating materials which have a temperature resistance and a thermal expansion coefficient which is comparable to that of the induction coil 1 or the support body 2, 3 on which the deflection profile 15 sits in individual cases. In practice, glass fiber reinforced epoxy plastics with low hygroscopic properties have proven to be particularly suitable. If 15 metallic materials are used for the deflection profile, the electromagnetic alternating field may be disturbed by them to the lowest possible extent. This requirement can either be met by a profile 15 in a metallic hollow construction or by a profile 15 in which only the support 17 consists of a thin metallic sheet.

Das Profil oder Umlenkprofil 15 kann bei den verschiedenen Ausführungsformen von unterschiedlichem Querschnitt sein; so ist z.B. bei einer nicht dargestellten Ausführungsform ein Profilblech als Profil 15 einerseits zwischen Tragkörper 3 und Induktionsspule 1 eingeklemmt und kragt unter Bildung der geneigten Prallfläche zum Giessstrang 10 hin aus.The profile or deflection profile 15 can be of different cross-section in the different embodiments; for example in an embodiment not shown, a profiled sheet as profile 15 is clamped on the one hand between support body 3 and induction coil 1 and protrudes toward the casting strand 10 to form the inclined baffle surface.

Claims (7)

1. Elektromagnetische Stranggiesskokille mit einem Tragkörper für eine Induktionsspule sowie einer Kühlvorrichtung, die wenigstens eine auf die Oberfläche des Giessstrangs gerichtete Kühldüse für ein flüssiges Kühlmittel aufweist,
dadurch gekennzeichnet,
dass der/den als Ringspalt (13) ausgebildeten Düsenöffnung/en in Strömungsrichtung des Kühlmittels ein Profil (15) nachgeschaltet ist, welches in die Bahn des aus dem Ringspalt austretenden Kühlmittelstrahles (14) mit einer gekrümmten oder zur Giessrichtung geneigten auswechselbaren Prallfläche einragt.1. Electromagnetic continuous casting mold with a support body for an induction coil and a cooling device which has at least one cooling nozzle for a liquid coolant directed onto the surface of the casting strand,
characterized,
that the nozzle opening (s) designed as an annular gap (13) is followed in the flow direction of the coolant by a profile (15) which projects into the path of the coolant jet (14) emerging from the annular gap with a curved or exchangeable baffle surface inclined to the casting direction. 2. Kokille nach Anspruch 1, dadurch gekennzeichnet, dass das Profil (15) im Gleitsitz in einer Ausnehmung (16) der Induktionsspule und/oder .des Tragkörpers (2) angebracht ist.2. Mold according to claim 1, characterized in that the profile (15) in the sliding fit in a recess (16) of the induction coil and / or. Of the support body (2) is attached. 3. Kokille nach Anspruch 1, gekennzeichnet durch eine auswechselbare Auflage (17) auf dem Profil (15), die die Prallfläche für Kühlmittel darstellt.3. Chill mold according to claim 1, characterized by an interchangeable support (17) on the profile (15), which represents the baffle surface for coolant. 4. Kokille nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der radiale Querschnitt der den Kühlmittelstrahl (14) umlenkenden Prallfläche ein Kurvensegment, vorzugsweise ein Parabelstück, darstellt.4. Chill mold according to one of claims 1 to 3, characterized in that the radial cross section of the deflecting surface deflecting the coolant jet (14) represents a curved segment, preferably a parabolic piece. 5. Kokille nach Anspruch 1 und 3, dadurch gekennzeichnet, dass das Profil (15) und das aufliegende Formstück (17) aus einem elektrisch isolierenden Kunststoff, vorzugsweise einem glasfaserverstärkten Epoxidkunststoff, bestehen.5. Chill mold according to claim 1 and 3, characterized in that the profile (15) and the overlying fitting (17) consist of an electrically insulating plastic, preferably a glass fiber reinforced epoxy plastic. 6. Kokille nach Anspruch 1 und 3, dadurch gekennzeichnet, dass das Profil (15) und/oder das aufliegende Formstück (16) von einem metallischen Hohlprofil gebildet sind.6. Chill mold according to claim 1 and 3, characterized in that the profile (15) and / or the overlying fitting (16) are formed by a metallic hollow profile. 7. Kokille nach wenigstens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass bei einer rechteckigen Stranggusskokille die Prallfläche jeder Seite so ausgebildet ist, dass sie in der Ansicht gesehen eine Wölbung mit mittigem Scheitelpunkt (20) darstellt.7. Mold according to at least one of claims 1 to 6, characterized in that in the case of a rectangular continuous casting mold, the baffle surface of each side is designed in such a way that it is seen in the view as a curvature with a central apex (20).
EP80810055A 1979-03-07 1980-02-15 Electro-magnetic mould for continuous casting Expired EP0015870B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80810055T ATE1134T1 (en) 1979-03-07 1980-02-15 ELECTROMAGNETIC CONTINUOUS CASTING MOLD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH220279 1979-03-07
CH2202/79 1979-03-07

Publications (2)

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EP0015870A1 true EP0015870A1 (en) 1980-09-17
EP0015870B1 EP0015870B1 (en) 1982-06-02

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EP80810055A Expired EP0015870B1 (en) 1979-03-07 1980-02-15 Electro-magnetic mould for continuous casting

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US (1) US4307772A (en)
EP (1) EP0015870B1 (en)
JP (1) JPS55122653A (en)
AT (1) ATE1134T1 (en)
CA (1) CA1153533A (en)
CS (1) CS221967B2 (en)
DE (1) DE2914246C2 (en)
NO (1) NO154950C (en)
PL (1) PL222506A1 (en)
YU (1) YU61880A (en)
ZA (1) ZA801038B (en)

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FR2530510A1 (en) * 1982-07-23 1984-01-27 Pechiney Aluminium METHOD FOR ELECTROMAGNETIC CASTING OF METALS IN WHICH AT LEAST ONE MAGNETIC FIELD DIFFERENT FROM THE FIELD OF CONFINEMENT IS EFFECTED
US4530394A (en) * 1979-07-11 1985-07-23 Olin Corporation Controlled water application for electromagnetic casting shape control
EP0229589A1 (en) * 1985-11-25 1987-07-22 Schweizerische Aluminium Ag Device and process for continuous casting of metals
EP0284565A1 (en) * 1987-03-23 1988-09-28 Alusuisse-Lonza Services Ag Electromagnetic continuous casting mould
EP0592360A1 (en) * 1992-10-06 1994-04-13 Alusuisse-Lonza Services Ag Machine for vertical continuous casting in a magnetic field

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ZA821828B (en) * 1981-04-02 1983-02-23 Alusuisse Process for cooling a continuously cast ingot during casting
US4446867A (en) * 1981-12-31 1984-05-08 Leveen Robert F Fluid-driven balloon catheter for intima fracture
US4512386A (en) * 1982-11-12 1985-04-23 Swiss Aluminium Ltd. Adjustable mold for electromagnetic casting
FR2599650B2 (en) * 1985-07-30 1988-08-26 Pechiney Aluminium METAL LOADING DEVICE
US4759748A (en) * 1986-06-30 1988-07-26 Raychem Corporation Guiding catheter
JPS63242443A (en) * 1987-03-31 1988-10-07 Sumitomo Light Metal Ind Ltd Casting apparatus in electromagnetic field
JPH01128944U (en) * 1988-02-24 1989-09-01
US6491087B1 (en) 2000-05-15 2002-12-10 Ravindra V. Tilak Direct chill casting mold system

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DE2902473A1 (en) * 1978-02-13 1979-08-16 Olin Corp METHOD FOR ELECTROMAGNETIC CASTING OF COPPER AND COPPER ALLOYS
GB2024063A (en) * 1978-07-03 1980-01-09 Olin Corp Electromagnetic casting method and apparatus

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US3741280A (en) * 1971-11-03 1973-06-26 G Safaroy Mould for the production of metal ingots
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GB2014068A (en) * 1978-02-13 1979-08-22 Olin Corp Casting molten metals
FR2416750A1 (en) * 1978-02-13 1979-09-07 Olin Corp METHOD AND APPARATUS FOR CASTING IN AN ELECTROMAGNETIC FIELD OF COPPER AND COPPER-BASED ALLOYS
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Cited By (8)

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Publication number Priority date Publication date Assignee Title
US4530394A (en) * 1979-07-11 1985-07-23 Olin Corporation Controlled water application for electromagnetic casting shape control
FR2530510A1 (en) * 1982-07-23 1984-01-27 Pechiney Aluminium METHOD FOR ELECTROMAGNETIC CASTING OF METALS IN WHICH AT LEAST ONE MAGNETIC FIELD DIFFERENT FROM THE FIELD OF CONFINEMENT IS EFFECTED
EP0100289A2 (en) * 1982-07-23 1984-02-08 Cegedur Societe De Transformation De L'aluminium Pechiney Process for the electromagnetical casting of metals using at least one magnetical field differing from another bordering magnetical field
EP0100289A3 (en) * 1982-07-23 1984-04-11 Aluminium Pechiney Process for the electromagnetical casting of metals using at least one magnetical field differing from another bordering magnetical field
EP0229589A1 (en) * 1985-11-25 1987-07-22 Schweizerische Aluminium Ag Device and process for continuous casting of metals
EP0284565A1 (en) * 1987-03-23 1988-09-28 Alusuisse-Lonza Services Ag Electromagnetic continuous casting mould
EP0592360A1 (en) * 1992-10-06 1994-04-13 Alusuisse-Lonza Services Ag Machine for vertical continuous casting in a magnetic field
CH688129A5 (en) * 1992-10-06 1997-05-30 Alusuisse Lonza Services Ag Casting machine for the vertical continuous casting in a magnetic field.

Also Published As

Publication number Publication date
NO154950B (en) 1986-10-13
YU61880A (en) 1983-02-28
US4307772A (en) 1981-12-29
PL222506A1 (en) 1980-12-01
JPS55122653A (en) 1980-09-20
ATE1134T1 (en) 1982-06-15
JPH029899B2 (en) 1990-03-05
NO154950C (en) 1987-01-21
ZA801038B (en) 1981-03-25
DE2914246C2 (en) 1981-11-12
CS221967B2 (en) 1983-04-29
CA1153533A (en) 1983-09-13
NO800629L (en) 1980-09-08
EP0015870B1 (en) 1982-06-02
DE2914246B1 (en) 1980-07-24

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