EP0035675B2 - Method and arrangement for horizontal continuous casting of liquid metals, especially steel - Google Patents

Method and arrangement for horizontal continuous casting of liquid metals, especially steel Download PDF

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Publication number
EP0035675B2
EP0035675B2 EP81101230A EP81101230A EP0035675B2 EP 0035675 B2 EP0035675 B2 EP 0035675B2 EP 81101230 A EP81101230 A EP 81101230A EP 81101230 A EP81101230 A EP 81101230A EP 0035675 B2 EP0035675 B2 EP 0035675B2
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EP
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Prior art keywords
continuous casting
mould
horizontal continuous
casting
storage vessel
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EP81101230A
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German (de)
French (fr)
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EP0035675B1 (en
EP0035675A1 (en
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Siegfried Dr.-Ing. Henders
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Vodafone GmbH
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Mannesmann AG
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
    • B22D11/047—Means for joining tundish to mould

Definitions

  • the invention relates to a method and a device which is particularly advantageous for the exercise thereof for the horizontal continuous casting of liquid metals, in particular steel, in which the casting metal in the cooled horizontal continuous casting metal in the cooled horizontal continuous casting mold is under the influence of gravity in the storage container and also additional, electromagnetically generated forces act on the casting metal in the casting direction, the liquid metal level in the reservoir being held above the horizontal continuous casting mold (DE-B-12 96 747).
  • Horizontal continuous casting saves bending of the cooling cast strand into the horizontal, as does complex, high-rise scaffolding. In the case of horizontal casting, bending forces are not required in the case of vertical casting with subsequent deflection, compared to oval or circular arch casting.
  • the devices for horizontal continuous casting show several shortcomings. Insofar as these devices work on the principle of pulling out the strand, with casting metal flowing from the storage container into the horizontal continuous casting mold, the connection of the storage vessel and horizontal continuous casting mold is always a critical point on the device. Depending on the properties of the liquid casting metal, the casting temperature of which can be over 1,500 ° C, highly stressed equipment parts, such as. B. the reservoir, the outflow pipe, the horizontal continuous casting mold for a repair after several castings are easily accessible. On the other hand, metallurgical requirements prohibit simplifying the equipment parts to such an extent that, for example, the casting metal is only passed from the storage container into the continuous casting mold in channels which are open at the top.
  • the known method works largely with the exclusion of air, so that reoxidations of the liquid cast metal are not to be feared.
  • the connection of the horizontal continuous casting mold to the storage container using a horizontal channel made of heat-resistant material not only leads to relatively high heat losses and to an unfavorably long transport distance for the liquid metal, but also to an unfavorable device which is difficult to control during operation handle and is also prone to failure.
  • the present invention is based on the procedural task of the casting metal in the shortest possible way, i. H. Shed horizontally without loss of temperature, avoiding narrow and long supply channels, i.e. Pour off large quantities of casting metal per unit of time and in particular to further increase the degree of filling in the horizontal continuous casting mold for larger mold cross-sections, as well as the device-technical task of creating an independence between the storage container and the horizontal continuous casting mold and thereby achieving easy accessibility and expandability of the horizontal continuous casting mold and other equipment parts.
  • the procedural part of the object of the invention is achieved in that the liquid metal level in the storage container is kept continuously at least at the height of the highest point on the circumference of the mold cross section of the horizontal continuous casting mold which is oscillating at the pouring opening during casting around an outflow pipe and that the resulting electromagnetic axial force is kept within the length of the horizontal continuous casting mold is continuously regulated to a size at which the liquid metal in the open cross section of the horizontal continuous casting mold is at least kept between the outflow pipe and the equilibrium, while the casting strand is continuously drawn off.
  • the particular advantage of these measures is based on the knowledge that the liquid metal column is counteracted in any length section within the horizontal continuous casting mold with adjustable pressure and at the same time the counteracting force is partly as the pressure of the liquid metal column in the supply container, partly as an electromagnetically generated axial force.
  • the horizontal continuous casting mold is not closed at the pouring opening, the proposed method enables the casting metal to be supplied in large quantities and in a very simple manner.
  • the feed path is very short, so that a very precise temperature control can be maintained during casting.
  • the casting metal is also not exposed to reoxidation by atmospheric oxygen even in such a process. The process allows the liquid metal to be fed into the horizontal continuous casting mold without any problems.
  • the method according to the invention is ultimately suitable for an almost complete coordination of liquid metal pressure, casting speed and electromagnetic force within the horizontal continuous casting mold.
  • the influence of the liquid metal pressure within a length section of the horizontal continuous casting mold during the cooling processes can also be suppressed in that the casting level in the storage vessel is kept several times the pouring cross section height of the horizontal continuous casting mold above its lowest point of the casting cross section.
  • the electromagnetic force as a control variable for the casting speed be set higher than the equilibrium force and then regulated down to the required casting speed.
  • the electromagnetically generated force counteracts the liquid metal pressure within the storage vessel, so that the liquid metal flow from the storage vessel can be braked within the desired limits.
  • the device for practicing the method according to the invention essentially consists of a storage vessel connected upstream of the horizontal continuous casting mold and an electrically excitable magnet coil running around the axis of the strand.
  • the device-related part of the object of the invention is based on this in that a horizontally extending one on the storage vessel.
  • Outflow pipe is provided with a section protruding into the oscillating horizontal continuous casting mold, a gap being formed between the outflow pipe and the horizontal continuous casting mold and the magnetic coil extending at least approximately to the longitudinal section of the section of the outflow pipe located within the horizontal continuous casting mold.
  • the device can be further improved. Such an improvement is obtained if the magnetic coil projects beyond the horizontal continuous casting mold at the pouring opening. This measure ensures that the liquid metal front cannot reach the edge of the pouring opening on the horizontal continuous casting mold.
  • the setting of the liquid metal front and, at the same time, the influencing of the strand shell thickness present at the exit of the horizontal continuous casting mold can be strengthened on the basis of a further feature.
  • the magnetic coil is mounted so as to be adjustable in the directions of the strand axis.
  • the desired concentration of the induction field in the space between the inner surface of the horizontal continuous casting mold and the outer surface of the filler pipe is further achieved due to such a design that the outflow pipe forms an annular gap on its outer surface together with the inner surface of the horizontal continuous casting mold.
  • the electrical induction forces act in a natural way in an advantageous manner, since heat can be supplied by their action and thus solidification in the annular space acting as a seal can be avoided.
  • the outflow pipe has a tapered outer contour, at least in its mouth region. This measure ensures that the outflow pipe with this shape always works in the liquid metal and does not impair the formation of solidification zones.
  • the storage vessel can be adjusted in the directions of the strand axis.
  • the adjustability is to be seen here in terms of an adjustability with respect to the horizontal continuous casting mold and with regard to the possibility of quickly removing the storage vessel from the horizontal continuous casting mold, or vice versa, at the start of casting. This design ensures the full accessibility of the horizontal continuous casting mold as well as the separate handling of the storage vessel.
  • Uniform cooling conditions under favorable conditions for the supply of the liquid metal are also achieved in that.
  • the storage vessel is adjustable in the vertical direction.
  • the proposed device can also be used in a wider range of horizontal continuous casting.
  • the storage vessel is designed as a distribution vessel for a multi-strand casting device and is provided with an outflow pipe at a distance from two adjacent casting lines.
  • the horizontal continuous caster (Fig. 1) is fed from the ladle 1 through the spout 2.
  • the liquid metal such as. B. steel, with a temperature of more than 1,500 ° C. reaches the storage vessel 3, which can be separated from the horizontal continuous casting mold 5 by means of the closure 4.
  • the cast strand 6 formed within the horizontal continuous casting mold 5 is cooled as much as possible in the cooling zone 7 and during this time is transported by means of the driving frame 8 and thereby transported via the roller table 9 onto the flame cutting roller table 10 and then cut into partial lengths by means of the flame cutting machine 11.
  • the cut-off partial lengths go on further processing on the cross-conveyor section 12.
  • the storage vessel 3 is provided with an outflow pipe 13 (FIG. 2) which extends horizontally into the interior of the horizontal continuous casting mold 5.
  • the length of the outflow pipe 13 depends indirectly on the amount of casting metal supplied per unit of time and directly on the dimensions of the horizontal continuous casting mold 5.
  • the outflow pipe 13 corresponds to the cooling intensity used in the horizontal continuous casting mold 5 and the expected strand shell formation 6a, which forms an acute angle with the strand axis 14 forms, continuously rejuvenated.
  • a step-by-step taper can also be used, which is provided in the mouth region 16.
  • the outflow pipe 13 consists of refractory material, from which the immersion spouts for continuous steel casting plants are usually made.
  • the horizontal continuous casting mold 5 is made in a known manner from copper, water-cooled and is moved back and forth concentrically to the strand axis 14 by means of the oscillation drive 17 in order to continuously detach the cast strand 6 formed from the inner surface 5a.
  • the magnet coil 18 is also arranged concentrically to the strand axis 14 or to the horizontal continuous casting mold 5. It is connected to the oscillating horizontal continuous casting mold 5 or (as drawn) fastened on a separate frame 19 which has the necessary connections for the electrical energy supply and for cooling water.
  • the magnet coil 18 extends over the length section 20, which at the same time covers a certain section 13a of the outflow pipe 13.
  • the concentric longitudinal sections of the magnet coil 18, the continuous casting mold 5 and the outflow pipe 13 arranged in the sense of the invention with a degree of coverage practically form an «electrical valve • which prevents the backflow of liquid metal against the flow direction 21.
  • the magnetic coil 18 can be adjusted in the directions 26 by means of rollers 24 on a path 25 parallel to the strand axis 14.
  • the electroinductive force can be concentrated here on the annular gap 27 which is formed by the inner surface 5a of the horizontal continuous casting mold 5 and the outer surface 28 of the outflow pipe 13.
  • Another adjustability of the liquid metal front 23 also results from the immersion depth of the outflow pipe 13, which is fastened to the storage container 3.
  • the storage container 3 is also stored on rollers 24 and can be adjusted in the directions 26.
  • the guideway 29 also rests on a lifting table 30 which can be adjusted in height in the vertical directions 32 by means of the hydraulic lifting drive 31.
  • the height adjustability is used, among other things, for the central adjustment of the discharge pipe 13 to the strand axis 14.
  • an adjustment of the discharge pipe 13 in the direction of the strand axis 14 or perpendicular to it can be favorable in order to produce a desired flow pattern of the liquid metal within the horizontal continuous casting mold 5.
  • the horizontal continuous casting outlet 5b is closed by means of a conventional start-up strand head and sealed off from the inner surface 5a by means of sealants.
  • the shutter 4 is also closed (as shown).
  • the closure 4 opens and the induction coil 18 is switched on.
  • the liquid metal front 23 is thereby formed.
  • the casting strand 6 which is being formed is pulled out by means of the drive frame 8, the tensile force initially being transmitted to the starting strand.
  • the force of the induction coil 18 is continuously electrically controlled in accordance with the height of the casting level 33.
  • the drive for the directions 26 of the induction coil 18 and the lifting drive 31 for the vertical directions 32 may also be included in this control. If necessary, movements of the storage container 3 in the directions 26 or of the outflow pipe 13 in the control must also be taken into account.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

A horizontal continuous casting method and apparatus is disclosed. Liquid metal, held in a storage container, is continuously maintained at a height not less than the height of the continuous casting mold. Additionally, adjustment of the relative positions with respect to one another of a magnetic coil surrounding a portion of the continuous casting mold, the storage container, in both the horizontal and vertical directions and the drain pipe extending from the storage container into the continuous casting mold is disclosed.

Description

Die Erfindung betrifft ein Verfahren und eine zu dessen Ausübung besonders vorteilhafte Einrichtung zum Horizontalstranggießen von flüssigen Metallen, insbesondere von Stahl, bei dem das Gießmetall in der gekühlten Horizontalstranggießmetall in der gekühlten Horizontalstranggießkokille unter dem Einfluß der Schwerkraft im Vorratsbehälter steht und außerdem zusätzliche, elektromagnetisch erzeugte Kräfte auf das Gießmetall in Gießrichtung wirken wobei der Flüssigmetallspiegel im Vorratsbehälter über der Horizontalstranggießkokille gehalten wird (DE-B-12 96 747).The invention relates to a method and a device which is particularly advantageous for the exercise thereof for the horizontal continuous casting of liquid metals, in particular steel, in which the casting metal in the cooled horizontal continuous casting metal in the cooled horizontal continuous casting mold is under the influence of gravity in the storage container and also additional, electromagnetically generated forces act on the casting metal in the casting direction, the liquid metal level in the reservoir being held above the horizontal continuous casting mold (DE-B-12 96 747).

Das Horizontalstranggießen erspart ein Biegen des sich abkühlenden Gußstranges in die Horizontale, ebenso aufwendige, in die Höhe bauende Gerüste. Dem Senkrechtgießen mit anschließendem Umlenken, dem Ovalbogen- oder Kreisbogen-Gießen gegenüber sind beim Horizontalgie- ßen Biegekräfte nicht erforderlich.Horizontal continuous casting saves bending of the cooling cast strand into the horizontal, as does complex, high-rise scaffolding. In the case of horizontal casting, bending forces are not required in the case of vertical casting with subsequent deflection, compared to oval or circular arch casting.

Dem größeren Aufwand an Gerüsthöhe bei vertikal angeordneter Stranggießvorrichtung . gegenüber stößt der Horizontalguß auf bestimmte Schwierigkeiten, die insbesondere von der horizontalen Lage des Gußstrangs während der Abkühlung des Gießmetalls herrühren. Das horizontale Gießverfahren schließt nicht aus, daß der bei der Erstarrung des Gießmetalls entstehende Lunker nicht wieder mit flüssigem Metall gefüllt wird und daß der Lunker in den oberen Querschnittsbereich des Gießstranges verschoben wird. Verunreinigungen des Gießmetalls unterliegen einer gewissen Unsymmetrie beim Entmischen und Absetzen.The greater effort in terms of scaffolding height with a vertically arranged continuous casting device. on the other hand, horizontal casting encounters certain difficulties which arise in particular from the horizontal position of the cast strand during the cooling of the cast metal. The horizontal casting process does not preclude the blowholes formed during solidification of the casting metal from being refilled with liquid metal and the blowholes being shifted into the upper cross-sectional area of the casting strand. Contamination of the cast metal is subject to a certain asymmetry when segregating and settling.

Die Einrichtungen zum Horizontalstranggießen lassen mehrere Unzulänglichkeiten erkennen. Soweit diese Einrichtungen nach dem Prinzip arbeiten, den Strang herauszuziehen, wobei Gießmetall aus dem Vorratsbehälter in die Horizontalstranggießkokille nachfließt, ist die Verbindung von Vorratsgefäß und Horizontalstranggießkokille stets eine kritische Stelle an der Einrichtung. Je nach den Eigenschaften des flüssigen Gießmetalls, dessen Gießtemperatur über 1 500 °C betragen kann, müssen hochbeanspruchte Einrichtungsteile, wie z. B. der Vorratsbehälter, das Ausflußrohr, die Horizontalstranggießkokille für eine Wiederinstandsetzung nach mehreren Abgüssen leicht zugänglich sein. Auf der anderen Seite verbieten metallurgische Erfordernisse, die Einrichtungsteile so weit zu vereinfachen, daß beispielsweise das Gießmetall nur in oben offenen Rinnen vom Vorratsbehälter in die Stranggießkokille geleitet wird.The devices for horizontal continuous casting show several shortcomings. Insofar as these devices work on the principle of pulling out the strand, with casting metal flowing from the storage container into the horizontal continuous casting mold, the connection of the storage vessel and horizontal continuous casting mold is always a critical point on the device. Depending on the properties of the liquid casting metal, the casting temperature of which can be over 1,500 ° C, highly stressed equipment parts, such as. B. the reservoir, the outflow pipe, the horizontal continuous casting mold for a repair after several castings are easily accessible. On the other hand, metallurgical requirements prohibit simplifying the equipment parts to such an extent that, for example, the casting metal is only passed from the storage container into the continuous casting mold in channels which are open at the top.

Es ist schon vorgeschlagen worden (DE-AS 1296747, IPC B22D, 11/10), zur Zufuhr einer metallischen Schmelze aus einem Vorratsbehälter zwischen diesem und der Horizontalstranggießkokille einen horizontalen Kanal vorzusehen, wobei eine magnetische Pumpe um den Kanal angeordnet ist. Zweck der magnetischen Pumpe ist es, das flüssige Metall in der Horizontalstranggießkokille ständig unter Druck zu halten, wodurch auch ein hoher Füllungsgrad des Innenraums der Horizontalstranggießkokille erzielt werden soll. Die bekannte Lösung geht im Ergebnis davon aus, daß man mit der vorgeschlagenen Gestaltung außerdem den sich gewöhnlich im oberen Teil des Produktes während des Erstarrens bildenden Hohlraum (Lunker) vermeiden oder zumindest weitgehend verkleinern könne. Eine weitere Wirkung des Druckes in der Horizontalstranggießkokille wird darin gesehen, daß der Wärmeaustausch zwischen dem Gießmetall und den Wänden der Horizontalstranggießkokille verbessert würde und das Erstarren erleichtert werde.It has already been proposed (DE-AS 1296747, IPC B22D, 11/10) to provide a horizontal channel for supplying a metallic melt from a storage container between the latter and the horizontal continuous casting mold, a magnetic pump being arranged around the channel. The purpose of the magnetic pump is to keep the liquid metal in the horizontal continuous casting mold constantly under pressure, as a result of which a high degree of filling of the interior of the horizontal continuous casting mold is also to be achieved. As a result, the known solution is based on the fact that, with the proposed design, the cavity (blowholes) which usually forms in the upper part of the product during solidification can also be avoided or at least largely reduced. Another effect of the pressure in the horizontal continuous casting mold is seen in that the heat exchange between the casting metal and the walls of the horizontal continuous casting mold would be improved and the solidification would be facilitated.

Das bekannte Verfahren arbeitet zwar weitestgehend unter Luftabschluß, so daß Reoxidationen des flüssigen Gießmetalls nicht zu befürchten sind. Die Verbindung der Horizontalstranggießkokille mit dem Vorratsbehälter unter Anwendung eines horizontalen Kanals aus hitzebeständigem Material führt jedoch nicht nur zu relativ hohen Wärmeverlusten und zu einer ungünstigen langen Transportstrecke des flüssigen Metalls, sondern auch zu einer ungünstigen Vorrichtung, die während des Betriebs nur schwierig zu kontrollieren, zu handhaben und außerdem störungsanfällig ist.The known method works largely with the exclusion of air, so that reoxidations of the liquid cast metal are not to be feared. However, the connection of the horizontal continuous casting mold to the storage container using a horizontal channel made of heat-resistant material not only leads to relatively high heat losses and to an unfavorably long transport distance for the liquid metal, but also to an unfavorable device which is difficult to control during operation handle and is also prone to failure.

Der vorliegenden Erfindung liegt die verfahrenstechnische Aufgabe zugrunde, das Gießmetall auf kürzestem Wege, d. h. ohne Temperaturverluste, horizontal zu vergießen, dabei enge und lange Zuführungskanäle zu vermeiden, d.h. große Mengen Gießmetall pro Zeiteinheit abzugießen und insbesondere den Füllungsgrad in der Horizontalstranggießkokille für größere Kokillenquerschnitte noch weiter zu steigern, ferner die vorrichtungstechnische Aufgabe, eine Unabhängigkeit zwischen Vorratsbehälter und Horizontalstranggießkokille zu schaffen und dadurch eine leichte Zugänglichkeit und Ausbaufähigkeit der Horizontalstranggießkokille und weiterer Einrichtungsteile zu erzielen.The present invention is based on the procedural task of the casting metal in the shortest possible way, i. H. Shed horizontally without loss of temperature, avoiding narrow and long supply channels, i.e. Pour off large quantities of casting metal per unit of time and in particular to further increase the degree of filling in the horizontal continuous casting mold for larger mold cross-sections, as well as the device-technical task of creating an independence between the storage container and the horizontal continuous casting mold and thereby achieving easy accessibility and expandability of the horizontal continuous casting mold and other equipment parts.

Der verfahrenstechnische Teil der Erfindungsaufgabe wird dadurch gelöst, daß der Flüssigmetallspiegel im Vorratsbehälter kontinuierlich zumindest auf der Höhe des höchsten Punktes am Umfang des Kokillenquerschnitts der an der Eingießöffnung während des Gießens um ein Ausflussrohr zur Atmosphäre offenen oszillierenden Horizontalstranggießkokille gehalten wird und daß die resultierende elektromagnetische Axialkraft innerhalb der Länge der Horizontalstranggießkokille kontinuierlich auf eine Größe geregelt wird, bei der dem Flüssigmetall im offenen Querschnitt der Horizontalstranggießkokille zumindest das zwischen Ausflussrohr und Gleichgewicht gehalten, währenddem der Gießstrang kontinuierlich abgezogen wird. Der besondere Vorteil dieser Maßnahmen beruht auf der Erkenntnis, daß der Flüssigmetallsäule in einem beliebigen Längenabschnitt innerhalb der Horizontalstranggießkokille jeweils mit regelbarem Druck entgegengewirkt wird und gleichzeitig die entgegenwirkende Kraft teils als Druck der Flüssigmetallsäule im Vorratsbehälter, teils als elektromagnetisch erzeugte Axialkraft aufgebaut wird. Obgleich die Horizontalstranggießkokille an der Eingießöffnung unverschlossen ist, gelingt es aufgrund des vorgeschlagenen Verfahrens, das Gießmetall in großen Mengen und auf eine sehr einfache Art zuzuführen. Dabei ist der Zufuhrweg sehr kurz, so daß eine sehr genaue Temperatursteuerung während des Abgießens eingehalten werden kann. Das Gießmetall ist ferner auch bei einem solchen Verfahren nicht der Reoxidation durch den Luftsauerstoff ausgesetzt. Das Verfahren gestattet eine problemlose Einspeisung des Flüssigmetalls in die Horizontalstranggießkokille.The procedural part of the object of the invention is achieved in that the liquid metal level in the storage container is kept continuously at least at the height of the highest point on the circumference of the mold cross section of the horizontal continuous casting mold which is oscillating at the pouring opening during casting around an outflow pipe and that the resulting electromagnetic axial force is kept within the length of the horizontal continuous casting mold is continuously regulated to a size at which the liquid metal in the open cross section of the horizontal continuous casting mold is at least kept between the outflow pipe and the equilibrium, while the casting strand is continuously drawn off. The particular advantage of these measures is based on the knowledge that the liquid metal column is counteracted in any length section within the horizontal continuous casting mold with adjustable pressure and at the same time the counteracting force is partly as the pressure of the liquid metal column in the supply container, partly as an electromagnetically generated axial force. Although the horizontal continuous casting mold is not closed at the pouring opening, the proposed method enables the casting metal to be supplied in large quantities and in a very simple manner. The feed path is very short, so that a very precise temperature control can be maintained during casting. The casting metal is also not exposed to reoxidation by atmospheric oxygen even in such a process. The process allows the liquid metal to be fed into the horizontal continuous casting mold without any problems.

Das erfindungsgemäße Verfahren eignet sich letztenendes zu einer nahezu vollkommenen Abstimmung von Flüssigmetalldruck, Gießgeschwindigkeit und elektromagnetischer Kraft innerhalb der Horizontalstranggießkokille.The method according to the invention is ultimately suitable for an almost complete coordination of liquid metal pressure, casting speed and electromagnetic force within the horizontal continuous casting mold.

Der Einfluß des Flüssigmetalldrucks innerhalb eines Längenabschnitts der Horizontalstranggießkokille bei den Abkühlungsvorgängen kann außerdem dadurch zurückgedrängt werden, daß der Gießspiegel im Vorratsgefäß um das Mehrfache der Gießquerschnittshöhe der Horizontalstranggießkokille über deren tiefstem Punkt des Gießquerschnitts gehalten wird.The influence of the liquid metal pressure within a length section of the horizontal continuous casting mold during the cooling processes can also be suppressed in that the casting level in the storage vessel is kept several times the pouring cross section height of the horizontal continuous casting mold above its lowest point of the casting cross section.

Nach einer zusätzlichen Verbesserung des Verfahrens wird vorgeschlagen, daß die elektromagnetische Kraft als Regelgröße für die Gießgeschwindigkeit höher als die Gleichgewichtskraft eingestellt und dann auf die geforderte Gießgeschwindigkeit abwärts geregelt wird. Hierbei wirkt die elektromagnetisch erzeugte Kraft dem Flüssigmetalldruck innerhalb des Vorratsgefäßes entgegen, so daß der Flüssigmetallstrom aus dem Vorratsgefäß in gewünschten Grenzen gebremst werden kann.According to an additional improvement of the method, it is proposed that the electromagnetic force as a control variable for the casting speed be set higher than the equilibrium force and then regulated down to the required casting speed. Here, the electromagnetically generated force counteracts the liquid metal pressure within the storage vessel, so that the liquid metal flow from the storage vessel can be braked within the desired limits.

Die Vorrichtung zur Ausübung des erfindungsgemäßen Verfahrens besteht gattungsgemäß im wesentlichen aus einem der Horizontalstranggießkokille vorgeschalteten Vorratsgefäß und einer um die Strangachse verlaufenden elektrisch erregbaren Magnetspule.The device for practicing the method according to the invention essentially consists of a storage vessel connected upstream of the horizontal continuous casting mold and an electrically excitable magnet coil running around the axis of the strand.

Der vorrichtungstechnische Teil der Erfindungsaufgabe wird darauf aufbauend dadurch gelöst, daß an dem Vorratsgefäß ein sich horizontal erstreckendes. Ausflußrohr mit einem in die oszillierende Horizontalstranggießkokille hineinragenden Abschnitt vorgesehen ist wobei zwischen Ausflussrohr und Horizontalstranggießkokille ein Spalt gebildet ist und daß sich die Magnetspule zumindest etwa auf den Längenabschnitt des innerhalb der Horizontalstranggießkokille befindlichen Abschnittes des Ausflußrohres erstreckt. Diese Lösung gewährleistet eine Unabhängigkeit von Vorratsbehälter und Horizontalstranggießkokille, die im Betrieb einer dauernden Kontrollierbarkeit unterliegen. Ferner löst diese Anordnung erstmals die Aufgabe innerhalb einer Horizontalstranggießkokille eine Flüssigmetallfront zu bilden, d. h. ein horizontales Auslaufen der einseitig offenen Horizontalstranggießkokille zu vermeiden.The device-related part of the object of the invention is based on this in that a horizontally extending one on the storage vessel. Outflow pipe is provided with a section protruding into the oscillating horizontal continuous casting mold, a gap being formed between the outflow pipe and the horizontal continuous casting mold and the magnetic coil extending at least approximately to the longitudinal section of the section of the outflow pipe located within the horizontal continuous casting mold. This solution ensures independence from the storage container and the horizontal continuous casting mold, which are subject to constant controllability during operation. Furthermore, this arrangement for the first time solves the task of forming a liquid metal front within a horizontal continuous casting mold, i. H. to avoid horizontal leakage of the horizontal continuous casting mold, which is open on one side.

Die Vorrichtung kann weiter verbessert werden. Eine solche Verbesserung ergibt sich, wenn die Magnetspule die Horizontalstranggießkokille an der Eingießöffnung überragt. Diese Maßnahme gewährleistet, daß die Flüssigmetallfront den Rand der Eingießöffnung an der Horizontalstranggießkokille nicht erreichen kann.The device can be further improved. Such an improvement is obtained if the magnetic coil projects beyond the horizontal continuous casting mold at the pouring opening. This measure ensures that the liquid metal front cannot reach the edge of the pouring opening on the horizontal continuous casting mold.

Die Einstellung der Flüssigmetallfront und gleichzeitig die Beeinflussung der am Ausgang der Horizontalstranggießkokille vorhandenen Strangschalendicke kann auf der Grundlage eines weiteren Merkmals noch verstärkt werden.The setting of the liquid metal front and, at the same time, the influencing of the strand shell thickness present at the exit of the horizontal continuous casting mold can be strengthened on the basis of a further feature.

Dazu ist vorgesehen, daß die Magnetspule in den Richtungen der Strangachse verstellbar gelagert ist.For this purpose it is provided that the magnetic coil is mounted so as to be adjustable in the directions of the strand axis.

Die anzustrebende Konzentration des Induktionsfeldes in dem Raum zwischen der Innenfläche der Horizontalstranggießkokille und der Außenfläche des Einfüllrohres wird ferner aufgrund einer derartigen Gestaltung erzielt, daß das Ausflußrohr an seiner Außenfläche zusammen mit der Innenfläche der Horizontalstranggießkokille einen Ringspalt bildet. Die elektrischen Induktionskräfte wirken hierbei in natürlicher Weise schon vorteilhaft, als durch ihre Wirkung Wärme zugeführt und somit ein Erstarren in dem als Abdichtung wirkenden Ringraum vermeiden werden kann.The desired concentration of the induction field in the space between the inner surface of the horizontal continuous casting mold and the outer surface of the filler pipe is further achieved due to such a design that the outflow pipe forms an annular gap on its outer surface together with the inner surface of the horizontal continuous casting mold. The electrical induction forces act in a natural way in an advantageous manner, since heat can be supplied by their action and thus solidification in the annular space acting as a seal can be avoided.

Für die Bildung einer Strangschale innerhalb der Horizontalstranggießkokille wirkt unterstützend, daß gemäß einem anderen Erfindungsmerkmal das Ausflußrohr zumindest in seinem Mündungsbereich eine verjüngte Außenkontur aufweist. Diese Maßnahme gewährleistet, daß das Ausflußrohr mit dieser Formgebung stets im flüssigen Metall arbeitet und die Bildung von Erstarrungszonen nicht beeinträchtigt.For the formation of a strand shell within the horizontal continuous casting mold, a supportive effect is that, according to another feature of the invention, the outflow pipe has a tapered outer contour, at least in its mouth region. This measure ensures that the outflow pipe with this shape always works in the liquid metal and does not impair the formation of solidification zones.

Betriebsmäßig günstig ist außerdem, daß das Vorratsgefäß in den Richtungen der Strangachse anstellbar ist. Die Anstellbarkeit ist hier im Sinn einer Justierbarkeit in bezug auf die Horizontalstranggießkokille und in bezug auf die Möglichkeit zu sehen, das Vorratsgefäß schnellstens aus der Horizontalstranggießkokille zu entfernen oder umgekehrt, bei- Gießbeginn einzuführen. Diese Gestaltung sichert die vollkommene Zugänglichkeit der Horizontalstranggießkokille sowie die getrennte Handhabung des Vorratsgefäßes.It is also advantageous from an operational point of view that the storage vessel can be adjusted in the directions of the strand axis. The adjustability is to be seen here in terms of an adjustability with respect to the horizontal continuous casting mold and with regard to the possibility of quickly removing the storage vessel from the horizontal continuous casting mold, or vice versa, at the start of casting. This design ensures the full accessibility of the horizontal continuous casting mold as well as the separate handling of the storage vessel.

Gleichmäßige Abkühlungsverhältnisse bei günstigen Bedingungen für das Zuführen des Flüssigmetalls werden ferner dadurch erzielt, daß. das Vorratsgefäß in vertikaler Richtung justierbar ist.Uniform cooling conditions under favorable conditions for the supply of the liquid metal are also achieved in that. the storage vessel is adjustable in the vertical direction.

Die vorgeschlagene Einrichtung kann schließlich noch in einem breiteren Bereich des Horizontalstranggießens angewendet werden. Nach einem diesbezüglichen Vorschlag ist das Vorratsgefäß als Verteilergefäß für eine Mehrstranggießeinrichtung ausgebildet und im Abstand von zwei benachbarten Gießadern jeweils mit einem Ausflußrohr versehen. Auch hier können die bereits erwähnten Merkmale als Verbesserungen der Erfindung nützlich sein.Finally, the proposed device can also be used in a wider range of horizontal continuous casting. According to a proposal in this regard, the storage vessel is designed as a distribution vessel for a multi-strand casting device and is provided with an outflow pipe at a distance from two adjacent casting lines. Again, the features already mentioned can be useful as improvements to the invention.

Ein Ausführungsbeispiel des einrichtungstechnischen Teils der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Außerdem wird das erfindungsgemäße Verfahren anhand der Einrichtung beschrieben.An embodiment of the technical equipment part of the invention is shown in the drawing and will be described in more detail below. In addition, the method according to the invention is described using the device.

Es zeigen :

  • Figur 1 die Gesamtansicht einer Horizontalstranggießanlage von der Seite gesehen.
  • Figur 2 einen senkrechten Querschnitt durch die Partie von Vorratsbehälter, Horizontalstranggießkokille und Magnetspule im vergrößerten Maßstab.
Show it :
  • Figure 1 seen the overall view of a horizontal caster from the side.
  • Figure 2 is a vertical cross section through the batch of storage container, horizontal continuous casting mold and magnetic coil on an enlarged scale.

Die Horizontalstranggießanlage (Fig. 1) wird aus der Gießpfanne 1 über den Ausguß 2 gespeist. Das flüssige Metall, wie z. B. Stahl, mit einer Temperatur von über 1 500 °C gelangt dabei in das Vorratsgefäß 3, das mittels des Verschlusses 4 von der Horizontalstranggießk®kille 5 abtrennbar ist. Der innerhalb der Horizontalstranggießkokille 5 gebildete Gußstrang 6 wird in der Kühlzone 7 weitestgehend abgekühlt und während dieser Zeit mittels des Treibgerüstes 8 transportiert und dabei über den Rollgang 9 auf den Brennschneidrollgang 10 befördert und danach mittels der Brennschneidmaschine 11 in Teillängen geschnitten. Die abgeschnittenen Teillängen gelangen auf der Querförderstrecke 12 in eine Weiterverarbeitung.The horizontal continuous caster (Fig. 1) is fed from the ladle 1 through the spout 2. The liquid metal, such as. B. steel, with a temperature of more than 1,500 ° C. reaches the storage vessel 3, which can be separated from the horizontal continuous casting mold 5 by means of the closure 4. The cast strand 6 formed within the horizontal continuous casting mold 5 is cooled as much as possible in the cooling zone 7 and during this time is transported by means of the driving frame 8 and thereby transported via the roller table 9 onto the flame cutting roller table 10 and then cut into partial lengths by means of the flame cutting machine 11. The cut-off partial lengths go on further processing on the cross-conveyor section 12.

Das Vorratsgefäß 3 ist mit einem Ausflußrohr 13 versehen (Fig. 2), das sich horizontal in das Innere der Horizontalstranggießkokille 5 erstreckt. Die Länge des Ausflußrohres 13 richtet sich mittelbar nach der pro Zeiteinheit zugeführten Gießmetallmenge und unmittelbar nach den Abmessungen der Horizontalstranggießkokille 5. Das Ausflußrohr 13 ist der angewendeten Kühlungsintensität in der Horizontalstranggießkokille 5 und der zu erwartenden Strangschalenbildung 6a entsprechend, die einen spitzen Winkel mit der Strangachse 14 bildet, sich stetig verjüngend ausgebildet. Anstelle der verjüngten Außenkontur 15 kann auch eine absatzweise Verjüngung Anwendung finden, die im Mündungsbereich 16 vorgesehen wird. Das Ausflußrohr 13 besteht aus feuerfestem Material, aus dem üblicherweise die Tauchausgüsse für Stahlstranggießanlagen hergestellt sind.The storage vessel 3 is provided with an outflow pipe 13 (FIG. 2) which extends horizontally into the interior of the horizontal continuous casting mold 5. The length of the outflow pipe 13 depends indirectly on the amount of casting metal supplied per unit of time and directly on the dimensions of the horizontal continuous casting mold 5. The outflow pipe 13 corresponds to the cooling intensity used in the horizontal continuous casting mold 5 and the expected strand shell formation 6a, which forms an acute angle with the strand axis 14 forms, continuously rejuvenated. Instead of the tapered outer contour 15, a step-by-step taper can also be used, which is provided in the mouth region 16. The outflow pipe 13 consists of refractory material, from which the immersion spouts for continuous steel casting plants are usually made.

Die Horizontalstranggießkokille 5 ist in bekannter Art aus Kupfer hergestellt, wassergekühlt und wird konzentrisch zur Strangachse 14 mittels des Oszillationsantriebs 17 hin- und herbewegt, um den gebildeten Gußstrang 6 von der Innenfläche 5a fortlaufend zu lösen.The horizontal continuous casting mold 5 is made in a known manner from copper, water-cooled and is moved back and forth concentrically to the strand axis 14 by means of the oscillation drive 17 in order to continuously detach the cast strand 6 formed from the inner surface 5a.

Ebenfalls konzentrisch zur Strangachse 14 bzw. zur Horizontalstranggießkokille 5 ist die Magnetspule 18 angeordnet. Sie ist mit der oszillierenden Horizontalstranggießkokille 5 verbunden oder (wie gezeichnet) auf einem getrennten Rahmen 19 befestigt, der die notwendigen Anschlüsse für die elektrische Energiezufuhr und für Kühlwasser aufweist. Die Magnetspule 18 erstreckt sich über den Längenabschnitt 20, der gleichzeitig einen gewissen Abschnitt 13a des Ausflußrohres 13 überdeckt. Die im Sinn der Erfindung mit einem Überdeckungsgrad » angeordneten konzentrischen Längenabschnitte der Magnetspule 18, der Stranggießkokille 5 und des Ausflußrohres 13 bilden praktisch ein « elektrisches Ventil •, das den Rückfluß von Flüssigmetall entgegen der Strömungsrichtung 21 verhindert.The magnet coil 18 is also arranged concentrically to the strand axis 14 or to the horizontal continuous casting mold 5. It is connected to the oscillating horizontal continuous casting mold 5 or (as drawn) fastened on a separate frame 19 which has the necessary connections for the electrical energy supply and for cooling water. The magnet coil 18 extends over the length section 20, which at the same time covers a certain section 13a of the outflow pipe 13. The concentric longitudinal sections of the magnet coil 18, the continuous casting mold 5 and the outflow pipe 13 arranged in the sense of the invention with a degree of coverage practically form an «electrical valve • which prevents the backflow of liquid metal against the flow direction 21.

Die an der Eingießöffnung 22 während des Betriebes offene Horizontalstranggießkokille 5 wird aus Sicherheitsgründen noch um einen bestimmten Betrag von der Magnetspule 18 überragt. Dieser Betrag an Länge kann auch, je nachdem, wo sich die Flüssigmetallfront 23 einstellt, noch nachträglich geändert werden. Dazu ist die Magnetspule 18 mittels Rollen 24 auf einer zur Strangachse 14 parallelen Bahn 25 in den Richtungen 26 anstellbar. Die elektroinduktive Kraft kann hierbei auf den Ringspalt 27 konzentriert werden, der durch die Innenfläche 5a der Horizontalstranggießkokille 5 und der Außenfläche 28 des Ausflußrohrs 13 gebildet wird.The horizontal continuous casting mold 5, which is open at the pouring opening 22 during operation, is still surmounted by the magnetic coil 18 for safety reasons. This amount of length can also be changed subsequently, depending on where the liquid metal front 23 is set up. For this purpose, the magnetic coil 18 can be adjusted in the directions 26 by means of rollers 24 on a path 25 parallel to the strand axis 14. The electroinductive force can be concentrated here on the annular gap 27 which is formed by the inner surface 5a of the horizontal continuous casting mold 5 and the outer surface 28 of the outflow pipe 13.

Eine andere Einstellbarkeit der Flüssigmetallfront 23 ergibt sich ferner durch die Eintauchtiefe des Ausflußrohres 13, das an dem Vorratsbehälter 3 befestigt ist. Wie gezeichnet, lagert der Vorratsbehälter 3 ebenfalls auf Rollen 24 und ist in den Richtungen 26 anstellbar. Die Führungsbahn 29 ruht außerdem auf einem Hubtich 30, der mittels des hydraulischen Hubantriebs 31 in den vertikalen Richtungen 32 höhenverstellbar ist. Die Höhenverstellbarkeit dient unter anderem zur mittigen Einstellung des Ausflußrohrs 13 auf die Strangachse 14. Während des Betriebes kann eine Nachstellung des Ausflußrohrs 13 in Richtung der Strangachse 14 oder zu dieser senkrecht günstig sein, um einen gewünschten Strömungsverlauf des Flüssigmetalls innerhalb der Horizontalstranggießkokille 5 zu erzeugen.Another adjustability of the liquid metal front 23 also results from the immersion depth of the outflow pipe 13, which is fastened to the storage container 3. As shown, the storage container 3 is also stored on rollers 24 and can be adjusted in the directions 26. The guideway 29 also rests on a lifting table 30 which can be adjusted in height in the vertical directions 32 by means of the hydraulic lifting drive 31. The height adjustability is used, among other things, for the central adjustment of the discharge pipe 13 to the strand axis 14. During operation, an adjustment of the discharge pipe 13 in the direction of the strand axis 14 or perpendicular to it can be favorable in order to produce a desired flow pattern of the liquid metal within the horizontal continuous casting mold 5.

Das erfindungsgemäße Verfahren wird folgendermaßen ausgeübt Zu Beginn des Gießvorganges ist der Horizontalstranggieß-Ausgang 5b mittels eines üblichen Anfahrstrangkopfes verschlossen und gegenüber der Innenfläche 5a mittels Dichtstoffen abgedichtet. Der Verschluß 4 ist ebenfalls geschlossen (wie gezeichnet). Sobald das Gießmetall aus der Gießpfanne 1 in den Vorratsbehälter 3 strömt und sich ein Gießspiegel 33 zumindest in der Höhe der Innenfläche 5a der Horizontalstranggießkokille 5 gebildet hat, öffnet der Verschluß 4, und die Induktionsspule 18 wird eingeschaltet. Dabei bildet sich die Flüssigmetallfront 23 aus. In dieser Phase erfolgt das Ausziehen des sich bildenden Gußstranges 6 mittels des Treibgerüstes 8, wobei die Zugkraft anfänglich auf den Anfahrstrang übertragen wird. Gegen Ende dieser Anfangsphase wird die Kraft der Induktionsspule 18 kontinuierlich entsprechend der Höhe des Gießspiegels 33 elektrisch gesteuert. In diese Steuerung ist gegebenenfalls der Antrieb für die Richtungen 26 der Induktionsspule 18 und der Hubantrieb 31 für die vertikalen Richtungen 32 mit einzubeziehen. Gegebenenfalls sind auch Bewegungen des Vorratsbehälters 3 in den Richtungen 26 bzw. des Ausflußrohres 13 in der Steuerung zu berücksichtigen.The method according to the invention is carried out as follows: At the start of the casting process, the horizontal continuous casting outlet 5b is closed by means of a conventional start-up strand head and sealed off from the inner surface 5a by means of sealants. The shutter 4 is also closed (as shown). As soon as the casting metal flows from the ladle 1 into the storage container 3 and a casting level 33 has formed at least at the level of the inner surface 5a of the horizontal continuous casting mold 5, the closure 4 opens and the induction coil 18 is switched on. The liquid metal front 23 is thereby formed. In this phase, the casting strand 6 which is being formed is pulled out by means of the drive frame 8, the tensile force initially being transmitted to the starting strand. Towards the end of this initial phase, the force of the induction coil 18 is continuously electrically controlled in accordance with the height of the casting level 33. The drive for the directions 26 of the induction coil 18 and the lifting drive 31 for the vertical directions 32 may also be included in this control. If necessary, movements of the storage container 3 in the directions 26 or of the outflow pipe 13 in the control must also be taken into account.

Claims (11)

1. Process for horizontal continuous casting of liquid metals, especially of steel, the metal in the cooled horizontal mould being influenced by the gravity prevailing in the storage vessel as well as by the electro-magnetically generated forces acting onto the metal to be cast, namely in casting direction, the level of the liquid metal in the storage vessel being kept above that of the mould characterised by : the level of the metal in the storage vessel being constantly maintained at least equivalent to that of the highest point on the cross-sectional circumference of the mould, open at the inlet and oscillating around the outlet pipe which is open to the atmosphere during casting, the resultant electro-magnetic axial force over the length of the mould being consistently controlled to a magnitude ensuring the liquid metal in the open mould cross-section is at least held in equilibrium while the strand is being continuously withdrawn.
2. Process according to claim 1 characterised by the casting level in the storage vessel being held at a level many times the casting cross section level of the horizontal continuous casting mould above its lowest casting cross section point.
3. Process according to claims 1 and 2, characterised by the electro-magnetic force used as a control variable for the casting rate being set higher than the equilibrium force and then being regulated down to the specified casting rate.
4. Equipment for implementing the process to claims 1 to 3, essentially comprising a storage vessel before a horizontal continuous casting mould and a magnetic coil, capable of being excited electrically, arranged around the strand axis, characterised by the horizontally extended outlet pipe (13) being arranged on the storage vessel (3) in such manner that it partly protrudes into the oscillating horizontal mould (5) to form a gap between the pipe (13) and the mould, the magnetic coil (18) extending at least as far as that longitudinal section of the outlet pipe (13) which protrudes into the mould (5).
5. Facility according to claim 4, characterised by the magnetic coil (18) extending beyond the horizontal continuous casting mould (5) at the inlet opening (22).
6. Facility according to claims 4 and 5, characterised by the magnetic coil (18) being mounted so that it may be adjusted in the directions (26) of the strand axis (14).
7. Facility according to claims 4 to 6, characterised by the outlet pipe (13) forming, on its outer face (28), an annular gap (27) with the inner face (5a) of the horizontal continuous casting mould (5).
8. Facility according to claims 4 to 7, characterised by the outlet pipe (13)- forming a tapering contour (15) at least over its mouth section (16).
9. Facility according to claims 4 to 7, characterised by the storage vessel (3) being adjustable in the directions (26) fo the strand axis (14).
10. Facility according to claims 4 to 8, characterised by the storage vessel (3) being adjustable in vertical direction.
11. Facility according to claims 4 to 9, characterised by the storage vessel (3) being of distributor vessel design for use in a multi-strand casting machine and being provided with one outlet pipe (13) each spaced to. suit two neighbouring casting strands.
EP81101230A 1980-03-11 1981-02-20 Method and arrangement for horizontal continuous casting of liquid metals, especially steel Expired EP0035675B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101230T ATE3252T1 (en) 1980-03-11 1981-02-20 METHOD AND EQUIPMENT FOR HORIZONTAL CONTINUOUS CASTING OF LIQUID METALS, ESPECIALLY STEEL.

Applications Claiming Priority (2)

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DE3009189A DE3009189B1 (en) 1980-03-11 1980-03-11 Process for the horizontal continuous casting of liquid metals, in particular steel, and device therefor
DE3009189 1980-03-11

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EP0035675A1 EP0035675A1 (en) 1981-09-16
EP0035675B1 EP0035675B1 (en) 1983-05-11
EP0035675B2 true EP0035675B2 (en) 1988-10-19

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JPS58168457A (en) * 1982-03-30 1983-10-04 Kawasaki Heavy Ind Ltd Horizontal and continuous casting device
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JPS6055209B2 (en) 1985-12-04
ATE3252T1 (en) 1983-05-15
EP0035675B1 (en) 1983-05-11
JPS571544A (en) 1982-01-06
EP0035675A1 (en) 1981-09-16
DE3009189B1 (en) 1981-08-20
US4456054A (en) 1984-06-26

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