EP0400302A2 - Method of and installation for filling a continuous casting mold with molten metal - Google Patents

Method of and installation for filling a continuous casting mold with molten metal Download PDF

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Publication number
EP0400302A2
EP0400302A2 EP90106625A EP90106625A EP0400302A2 EP 0400302 A2 EP0400302 A2 EP 0400302A2 EP 90106625 A EP90106625 A EP 90106625A EP 90106625 A EP90106625 A EP 90106625A EP 0400302 A2 EP0400302 A2 EP 0400302A2
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EP
European Patent Office
Prior art keywords
bath level
continuous casting
casting mold
opening
bottom opening
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Granted
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EP90106625A
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German (de)
French (fr)
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EP0400302B1 (en
EP0400302A3 (en
Inventor
Josef Lothmann
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Zimmermann and Jansen GmbH
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Zimmermann and Jansen GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14Closures
    • B22D41/16Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18Stopper-rods therefor
    • B22D41/186Stopper-rods therefor with means for injecting a fluid into the melt

Definitions

  • the invention relates to a method and a device for filling a continuous casting mold with a metallic melt, in which the melt is regulatedly poured into the continuous casting mold through a bottom opening of a metallurgical vessel, in particular a distribution channel, which can be moved up and down, whereby during the filling of the continuous casting mold, the stopper carries out predetermined upward and downward movements, in particular depending on the level of the bath level in the continuous casting mold, and furthermore during the filling of the continuous casting mold at the end of the stopper facing the bottom opening through an outlet opening provided there, inert gas, in particular argon, into the escaping melt is inflatable.
  • EP-A-0 084 416 From EP-A-0 084 416 it is known to provide a longitudinal bore in the stopper through which inert gas, in particular argon, can be introduced into the outflowing melt during casting.
  • inert gas in particular argon
  • the reason for this measure is to avoid freezing of the metallic melt and the deposition of aluminum oxide in the area of the bottom opening of the metallurgical vessel (see page 3, lines 20 ff, and page 11, line 5, EP-A-0 084 416).
  • the present invention is based on the object of creating a method and a device of the type mentioned at the outset, which allows fine adjustment of the bath level in the continuous casting mold while avoiding larger movements of the plug associated with the metallurgical vessel.
  • the ferrostatic height of the melt in the metallurgical vessel is also regulated, as in the not yet published DE-A-38 17 580 by the applicant, according to which the actual value of the amount of melt in the metallurgical vessel at successive times determined or sensed in the form of the melt weight or the bath level and with a target value, d. H. the target weight or the target bath level height, and then at least if the actual value is greater than or equal to the target value, the tendency of the control deviation upwards or downwards is determined, whereby when an upper or lower tendency limit value is approached or exceeded correspondingly reversed control signals are emitted to the stopper.
  • the stopper movement can be reduced to a minimum, so that overall a constant strand withdrawal speed is guaranteed.
  • system-inherent tolerances can also be compensated for in the best possible way.
  • reference numeral 13 is a metallurgical vessel, e.g. B. a distribution channel or a so-called "tundish", characterized from one of the Darge placed ladle molten metal 10 is supplied.
  • the spout on the bottom of the vessel 13 is defined by a bottom opening 12 and an adjoining dip tube 26.
  • the bottom opening 12 is assigned a plug 11 which can be moved up and down (double arrow 23) and with which the bottom opening 12 can be closed or opened in a predetermined manner.
  • a continuous casting mold 25 is arranged beneath the vessel 13, and melt is supplied to the bottom opening 12 with a corresponding opening. This is subsequently cooled in the continuous casting mold and cooled in a strand guide (not shown further) to form a solid steel strand.
  • the molten metal flowing out through the bottom opening 12 and the immersion tube 26 is identified by the arrows 28.
  • a bath level control is provided in a manner known per se. This consists of a measuring device for the bath level in the continuous casting mold 25 and is formed by a radioactive rod radiator 27 and a diametrically opposite scintillation counter 20 as a receiver.
  • the stopper 11 can be raised and lowered in the metallurgical vessel 13 via a crossmember 29 (double arrow 23).
  • the free end of the crossmember 29 is fastened to a vertical support 30 which can be moved up and down by a device (not shown in more detail), depending on the bath level height determined by the bath level measuring device 20, 27, a stopper movement always being triggered should be when the bath level 14 in the continuous casting mold 25 exceeds or falls below an upper or lower limit.
  • the last-mentioned limit values define a setpoint band, which can be broadened considerably by the measures described below, so that it is possible to move the within the considerably broadened setpoint band without plug movement Set and maintain the bath level to a specified setpoint height.
  • the plug 11 has at its end facing the bottom opening 12 of the metallurgical vessel 13 an outlet opening 18 which is connected to an inert gas, in particular an argon source 17 and through which inert gas, in particular argon, can be introduced into the outflowing melt (arrow 15).
  • the outlet opening 18 is connected to a central longitudinal bore 31 in the plug 11. This in turn is connected to the gas source or the gas reservoir 17 via a gas line 16, a control valve 19 being arranged in the connecting line 16 to regulate the amount of gas introduced into the melt, the degree of opening of which depends on that serving as a bath level sensor Scintillation counter 20 determined bath level 14 in the mold 25 is adjustable.
  • valve body 21 of the control valve 19 can be moved into a closed position or a predetermined opening or throttling position by a mechanical, pneumatic, hydraulic or electromotive drive 24, the drive 24 reacting to a bath level signal supplied by the scintillation counter 20, such that that when the bath level 14 rises in relation to a predetermined set point, the opening degree of the valve 19 is increased, and vice versa, so that when the bath level 14 rises in relation to a predetermined set point, more argon is blown into the outflowing melt (arrow 15) than when the bath level falls , so that the bath level height is kept essentially constant within the specified setpoint range for a given degree of opening of the plug 11.
  • the electrical connection between the scintillation counter 20 and the valve drive 24 is formed by the signal line 22.
  • a comparator 32 is also arranged in this, which determines whether the bath level height 14 in the mold 15 is still within the predefined setpoint range. If this is exceeded, the stopper is readjusted 11.
  • the corresponding signal for the plug drive, not shown, is identified by reference number 33.
  • the system described is based on the knowledge that the argon melted in the bottom opening area holds back more or less, depending on the amount of argon injected. In this way, the described fine control of the bath level 14 in the continuous casting mold 25 within the predetermined setpoint range is possible without additional readjustment of the stopper position. With the help of the measures described, the bath level setpoint band can be widened 2 to 3 times compared to the conventional setpoint band.
  • Argon can also be introduced through a gas line arranged in the bottom of the metallurgical vessel 13 and opening into the area of the bottom opening 12, which is also coupled to a controllable valve, so that depending on the deviation of the bath level 14 in the mold 25 from at a setpoint value, no, more or less argon can be blown into the outflowing melt with appropriate restraint.
  • the latter measure can also be provided in addition to the argon injection through the plug 11.
  • the control valve 19 is preferably actuated in cycles wise (digital).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

Method of and installation for filling a continuous casting mould (25) with molten metal (10), in which the molten metal (10) is poured in a controlled fashion into the continuous casting mould (25) through a bottom opening (12) of a metallurgical vessel (13), the said opening being closeable by means of a plug (11) which can be moved up and down. During the filling of the continuous casting mould, the plug (11) executes predetermined upward and downward movements, in particular movements dependent on the liquid metal level (14) in the continuous casting mould, and inert gas, especially argon, can furthermore be blown in (arrow 15) at that end of the plug (11) which faces the bottom opening (12) during the filling of the continuous casting mould. To control the liquid metal level (14) in the continuous casting mould (25), the inert gas is blown in as a function of the said liquid metal level (14), such that, if the liquid metal level rises in relation to a predetermined desired value, more argon is blown in than when the liquid metal level is falling, with the result that, for a predetermined degree of opening of the plug (11), the liquid metal level is held essentially constant. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Füllen einer Stranggießkokille mit metallischer Schmelze, bei dem bzw. der die Schmelze durch eine mittels eines auf- und ab­bewegbaren Stopfens verschließbare Bodenöffnung eines metallur­gischen Gefäßes, insbesondere einer Verteilerrinne, geregelt in die Stranggießkokille gegossen wird, wobei während des Fül­lens der Stranggießkokille der Stopfen vorgegebene, insbeson­dere von der Badspiegelhöhe in der Stranggießkokille abhängige Auf- und Abwärtsbewegungen ausführt, und wobei ferner während des Füllens der Stranggießkokille am der Bodenöffnung zuge­wandten Ende des Stopfens durch eine dort vorgesehene Aus­trittsöffnung Inertgas, insbesondere Argon, in die ausströmen­de Schmelze einblasbar ist.The invention relates to a method and a device for filling a continuous casting mold with a metallic melt, in which the melt is regulatedly poured into the continuous casting mold through a bottom opening of a metallurgical vessel, in particular a distribution channel, which can be moved up and down, whereby during the filling of the continuous casting mold, the stopper carries out predetermined upward and downward movements, in particular depending on the level of the bath level in the continuous casting mold, and furthermore during the filling of the continuous casting mold at the end of the stopper facing the bottom opening through an outlet opening provided there, inert gas, in particular argon, into the escaping melt is inflatable.

Aus der EP-A-0 084 416 ist es bekannt, im Stopfen eine Längs­bohrung vorzusehen, durch die hindurch Inertgas, insbesondere Argon, während des Gießens in die ausströmende Schmelze ein­leitbar ist. Der Grund für diese Maßnahme besteht darin, im Bereich der Bodenöffnung des metallurgischen Gefäßes ein Ein­frieren der metallischen Schmelze sowie die Ablagerung von Aluminiumoxid zu vermeiden (s. Seite 3, Zeilen 20 ff, und Sei­te 11, Zeile 5, der EP-A-0 084 416).From EP-A-0 084 416 it is known to provide a longitudinal bore in the stopper through which inert gas, in particular argon, can be introduced into the outflowing melt during casting. The reason for this measure is to avoid freezing of the metallic melt and the deposition of aluminum oxide in the area of the bottom opening of the metallurgical vessel (see page 3, lines 20 ff, and page 11, line 5, EP-A-0 084 416).

Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art zu schaffen, welches bzw. welche eine Feinregelung der Badspiegel­höhe in der Stranggießkokille unter Vermeidung größerer Bewe­gungsausschläge des dem metallurgischen Gefäß zugeordneten Stopfens erlaubt.The present invention is based on the object of creating a method and a device of the type mentioned at the outset, which allows fine adjustment of the bath level in the continuous casting mold while avoiding larger movements of the plug associated with the metallurgical vessel.

Diese Aufgabe wird verfahrenstechnisch durch die kennzeich­nenden Merkmale des Ansprüches 1 und/oder 2, und vorrichtungs­technisch durch die kennzeichnenden Merkmale des Anspruches 3 und/oder 6 gelöst.In terms of process technology, this object is achieved by the characterizing features of claim 1 and / or 2, and device technology by the characterizing features of claim 3 and / or 6.

Laborversuche haben gezeigt, daß man durch mehr oder weniger intensives Einblasen von Inertgas, insbesondere Argon, in die ausströmende Schmelze im Bereich der Bodenöffnung des metallur­gischen Gefäßes die Badspiegelhöhe äußerst exakt einstellen kann, insbesondere auf eine vorgegebene Sollwerthöhe, und zwar ohne daß der Stopfen dazu bewegt werden muß. Bekanntermaßen haben selbst geringste Stopfenbewegungen große Auswirkungen auf die Strömungs-Querschnittsfläche und damit auf die durch die Bodenöffnung ausströmende Schmelzenmenge mit der Folge, daß mit den herkömmlichen Maßnahmen eine Feinjustierung der Bad­spiegelhöhe in der Stranggießkokille praktisch nicht möglich ist. Darüber hinaus haben Stopfenbewegungen ein relativ un­ruhiges Strömungsbild zur Folge. Auch dies wird durch die er­findungsgemäßen Maßnahmen vermieden.Laboratory tests have shown that by blowing inert gas, in particular argon, more or less intensely into the outflowing melt in the area of the bottom opening of the metallurgical vessel, the bath level height can be set extremely precisely, in particular to a predetermined setpoint height, and without the stopper moving must become. As is known, even the slightest stopper movements have a large impact on the flow cross-sectional area and thus on the amount of melt flowing out through the bottom opening, with the result that a fine adjustment of the bath level height in the continuous casting mold is practically impossible with the conventional measures. In addition, plug movements result in a relatively turbulent flow pattern. This is also avoided by the measures according to the invention.

Vorzugsweise ist die ferrostatische Höhe der Schmelze im me­tallurgischen Gefäß, insbesondere Verteilerrinne oder "tundish" ebenfalls geregelt, und zwar wie in der noch nicht veröffentlichten DE-A-38 17 580 der Anmelderin, wonach zu aufeinanderfolgenden Zeitpunkten jeweils der Istwert der Schmelzenmenge im metallurgischen Gefäß in Form des Schmelzengewichts oder der Badspiegelhöhe festgestellt bzw. getastet und mit einem Sollwert, d. h. dem Sollgewicht oder der Soll-Badspiegelhöhe, verglichen wird, und wonach an­schließend zumindest dann, wenn der Istwert größer/gleich dem Sollwert ist, die Tendenz der Regelabweichung nach oben oder unten festgestellt wird, wobei bei Annäherung oder Überschrei­ten eines oberen oder unteren Tendenz-Grenzwertes entsprechend umgekehrte Stellsignale an den Stopfenverschluß abgegeben werden. Auf diese Weise läßt sich die Stopfenbewegung zusätz­lich auf ein Minimum reduzieren, so daß insgesamt eine kon­stante Strangabzugsgeschwindigkeit gewährleistet ist. Mit der letztgenannten Tendenzerkennung lassen sich auch systemimma­nente Toleranzen bestens kompensieren.Preferably, the ferrostatic height of the melt in the metallurgical vessel, in particular distribution channel or "tundish", is also regulated, as in the not yet published DE-A-38 17 580 by the applicant, according to which the actual value of the amount of melt in the metallurgical vessel at successive times determined or sensed in the form of the melt weight or the bath level and with a target value, d. H. the target weight or the target bath level height, and then at least if the actual value is greater than or equal to the target value, the tendency of the control deviation upwards or downwards is determined, whereby when an upper or lower tendency limit value is approached or exceeded correspondingly reversed control signals are emitted to the stopper. In this way, the stopper movement can be reduced to a minimum, so that overall a constant strand withdrawal speed is guaranteed. With the latter trend detection, system-inherent tolerances can also be compensated for in the best possible way.

Vorteilhafte Details der erfindungsgemäßen Vorrichtung sind noch in den Ansprüchen 4 und 5 sowie 7 beschrieben, wobei die Maßnahme nach Anspruch 7, wonach der Badspiegelsensor mit einer Tendenzerkennungseinrichtung gekoppelt ist, durch die in Ab­hängigkeit von der Geschwindigkeit der Badspiegeländerung in der Stranggießkokille das Regelventil für die Argon-Einbla­sung steuerbar ist, eine besonders schnelle Einstellung der optimalen Argonmenge erlauben.Advantageous details of the device according to the invention are also described in claims 4 and 5 and 7, the measure according to claim 7, according to which the bath level sensor is coupled to a tendency detection device, by means of which, depending on the speed of the bath level change in the continuous casting mold, the control valve for the argon -Injection is controllable, allow a particularly quick setting of the optimal amount of argon.

Nachstehend wird das erfindungsgemäße Verfahren im Zusammen­hang mit einer erfindungsgemäß ausgebildeten Vorrichtung an­hand der beigefügten schematischen Zeichnung näher erläutert. In dieser Zeichnung ist mit der Bezugsziffer 13 ein metallur­gisches Gefäß, z. B. eine Verteilerrinne oder ein sogenannter "tundish", gekennzeichnet, dem aus einer nicht weiter darge­ stellten Gießpfanne Metallschmelze 10 zugeführt wird. Der Aus­guß am Boden des Gefäßes 13 ist durch eine Bodenöffnung 12 und ein sich daran anschließendes Tauchrohr 26 definiert. Der Bodenöffnung 12 ist ein auf- und abbewegbarer (Doppelpfeil 23) Stopfen 11 zugeordnet, mit dem die Bodenöffnung 12 verschlos­sen oder in vorgegebener Weise geöffnet werden kann. Unterhalb des Gefäßes 13 ist eine Stranggießkokille 25 angeordnet, der unter entsprechender Öffnung der Bodenöffnung 12 Schmelze zu­geführt wird. Diese wird nachfolgend in der Stranggießkokille abgekühlt und in einer nicht weiter dargestellten Strangfüh­rung zu einem festen Stahlstrang erkaltet. Die durch die Bo­denöffnung 12 und das Tauchrohr 26 ausströmende Metallschmelze ist mit den Pfeilen 28 gekennzeichnet.The method according to the invention is explained in more detail below in connection with a device designed according to the invention with the aid of the attached schematic drawing. In this drawing, reference numeral 13 is a metallurgical vessel, e.g. B. a distribution channel or a so-called "tundish", characterized from one of the Darge placed ladle molten metal 10 is supplied. The spout on the bottom of the vessel 13 is defined by a bottom opening 12 and an adjoining dip tube 26. The bottom opening 12 is assigned a plug 11 which can be moved up and down (double arrow 23) and with which the bottom opening 12 can be closed or opened in a predetermined manner. A continuous casting mold 25 is arranged beneath the vessel 13, and melt is supplied to the bottom opening 12 with a corresponding opening. This is subsequently cooled in the continuous casting mold and cooled in a strand guide (not shown further) to form a solid steel strand. The molten metal flowing out through the bottom opening 12 and the immersion tube 26 is identified by the arrows 28.

Um den Zufluß der Schmelze aus dem metallurgischen Gefäß 13 in die Stranggießkokille 25 derart verändern zu können, daß der Badspiegel 14 in der Stranggießkokille etwa in der gleichen Höhe erhalten bleibt, ist in an sich bekannter Weise eine Bad­spiegel-Regelung vorgesehen. Diese besteht aus einer Meßein­richtung für den Badspiegel in der Stranggießkokille 25 und wird von einem radioaktiven Stabstrahler 27 und einem diametral gegenüberliegenden Szintillationszähler 20 als Empfänger gebil­det. Der Stopfen 11 ist über eine Traverse 29 in dem metallur­gischen Gefäß 13 heb- und senkbar (Doppelpfeil 23). Das freie Ende der Traverse 29 ist an einer vertikalen Stütze 30 befe­stigt, die durch eine nicht näher dargestellte Einrichtung auf- und abbewegbar ist, und zwar in Abhängigkeit von der durch die Badspiegel-Meßeinrichtung 20, 27 festgestellten Badspiegelhöhe, wobei eine Stopfenbewegung immer dann ausgelöst werden soll, wenn der Badspiegel 14 in der Stranggießkokille 25 eine Ober­grenze oder Untergrenze über- bzw. unterschreitet. Die letzt­erwähnten Grenzwerte definieren ein Sollwertband, welches durch die nachfolgend beschriebenen Maßnahmen erheblich ver­breitert werden kann, so daß es möglich ist, ohne Stopfenbe­wegung innerhalb des erheblich verbreiterten Sollwertbandes die Badspiegelhöhe auf eine vorgegebene Sollwerthöhe einzustellen und zu halten. Zu diesem Zweck weist der Stopfen 11 an seinem der Bodenöffnung 12 des metallurgischen Gefäßes 13 zugewandten Ende eine mit einer Inertgas, insbesondere Argonquelle 17 ver­bundene Austrittsöffnung 18 auf, durch die hindurch Inertgas, insbesondere Argon, in die ausströmende Schmelze einleitbar ist (Pfeil 15). Die Austrittsöffnung 18 ist mit einer zentra­len Längsbohrung 31 im Stopfen 11 verbunden. Diese wiederum steht über eine Gasleitung 16 mit der Gasquelle bzw. dem Gas­reservoir 17 in Verbindung, wobei zur Regelung der in die Schmelze eingeleiteten Gasmenge in der Verbindungsleitung 16 ein Regelventil 19 angeordnet ist, dessen Öffnungsgrad in Ab­hängigkeit von der mittels des als Badspiegel-Sensor dienenden Szintillationszählers 20 festgestellten Badspiegelhöhe 14 in der Kokille 25 einstellbar ist. Zu diesem Zweck ist der Ventil­körper 21 des Regelventils 19 durch einen mechanischen, pneu­matischen, hydraulischen oder elektromotorischen Antrieb 24 in Schließstellung oder eine vorgegebene Öffnungs- bzw. Dros­selstellung bewegbar, wobei der Antrieb 24 auf ein vom Szin­tillationszähler 20 geliefertes Badspiegelsignal (reagiert), derart, daß bei im Verhältnis zu einem vorgegebenen Sollwert steigendem Badspiegel 14 der Öffnungsgrad des Ventils 19 ver­größert wird, und umgekehrt, so daß bei im Verhältnis zu einem vorgegebenen Sollwert steigendem Badspiegel 14 mehr Argon in die ausströmende Schmelze (Pfeil 15) eingeblasen wird als bei sinkendem Badspiegel, so daß innerhalb des erwähnten Sollwert­bandes die Badspiegelhöhe bei vorgegebenem Öffnungsgrad des Stopfens 11 im wesentlichen konstant gehalten wird.In order to be able to change the inflow of the melt from the metallurgical vessel 13 into the continuous casting mold 25 in such a way that the bath level 14 in the continuous casting mold is maintained at approximately the same height, a bath level control is provided in a manner known per se. This consists of a measuring device for the bath level in the continuous casting mold 25 and is formed by a radioactive rod radiator 27 and a diametrically opposite scintillation counter 20 as a receiver. The stopper 11 can be raised and lowered in the metallurgical vessel 13 via a crossmember 29 (double arrow 23). The free end of the crossmember 29 is fastened to a vertical support 30 which can be moved up and down by a device (not shown in more detail), depending on the bath level height determined by the bath level measuring device 20, 27, a stopper movement always being triggered should be when the bath level 14 in the continuous casting mold 25 exceeds or falls below an upper or lower limit. The last-mentioned limit values define a setpoint band, which can be broadened considerably by the measures described below, so that it is possible to move the within the considerably broadened setpoint band without plug movement Set and maintain the bath level to a specified setpoint height. For this purpose, the plug 11 has at its end facing the bottom opening 12 of the metallurgical vessel 13 an outlet opening 18 which is connected to an inert gas, in particular an argon source 17 and through which inert gas, in particular argon, can be introduced into the outflowing melt (arrow 15). The outlet opening 18 is connected to a central longitudinal bore 31 in the plug 11. This in turn is connected to the gas source or the gas reservoir 17 via a gas line 16, a control valve 19 being arranged in the connecting line 16 to regulate the amount of gas introduced into the melt, the degree of opening of which depends on that serving as a bath level sensor Scintillation counter 20 determined bath level 14 in the mold 25 is adjustable. For this purpose, the valve body 21 of the control valve 19 can be moved into a closed position or a predetermined opening or throttling position by a mechanical, pneumatic, hydraulic or electromotive drive 24, the drive 24 reacting to a bath level signal supplied by the scintillation counter 20, such that that when the bath level 14 rises in relation to a predetermined set point, the opening degree of the valve 19 is increased, and vice versa, so that when the bath level 14 rises in relation to a predetermined set point, more argon is blown into the outflowing melt (arrow 15) than when the bath level falls , so that the bath level height is kept essentially constant within the specified setpoint range for a given degree of opening of the plug 11.

Die elektrische Verbindung zwischen dem Szintillationszähler 20 und dem Ventilantrieb 24 ist durch die Signalleitung 22 gebildet. In dieser ist noch ein Komparator 32 angeordnet, welcher feststellt, ob die Badspiegelhöhe 14 in der Kokille 15 noch innerhalb des vorgegebenen Sollwertbandes liegt. Wird dieses überschritten, erfolgt eine Nachregelung des Stopfens 11. Das entsprechende Signal zum nicht näher dargestellten Stopfenantrieb ist mit der Bezugsziffer 33 gekennzeichnet.The electrical connection between the scintillation counter 20 and the valve drive 24 is formed by the signal line 22. A comparator 32 is also arranged in this, which determines whether the bath level height 14 in the mold 15 is still within the predefined setpoint range. If this is exceeded, the stopper is readjusted 11. The corresponding signal for the plug drive, not shown, is identified by reference number 33.

Dem beschriebenen System liegt die Erkenntnis zugrunde, daß durch das im Bodenöffnungsbereich eingeblasene Argon Schmelze zurückgehalten wird, und zwar in Abhängigkeit von der Menge des eingeblasenen Argons mehr oder weniger. Auf diese Weise ist die beschriebene Feinregelung der Badspiegelhöhe 14 in der Stranggießkokille 25 innerhalb des vorgegebenen Sollwertbandes ohne zusätzliche Nachjustierung der Stopfenstellung möglich. Das Badspiegel-Sollwertband kann mit Hilfe der beschriebenen Maßnahmen im Vergleich zum herkömmlichen Sollwertband auf das 2- bis 3-fache verbreitert werden.The system described is based on the knowledge that the argon melted in the bottom opening area holds back more or less, depending on the amount of argon injected. In this way, the described fine control of the bath level 14 in the continuous casting mold 25 within the predetermined setpoint range is possible without additional readjustment of the stopper position. With the help of the measures described, the bath level setpoint band can be widened 2 to 3 times compared to the conventional setpoint band.

Die Einleitung von Argon kann auch durch eine im Boden des metallurgischen Gefäßes 13 angeordnete und in den Bereich der Bodenöffnung 12 mündende Gasleitung erfolgen, die ebenfalls mit einem regelbaren Ventil gekoppelt ist, so daß in Abhän­gigkeit von der Abweichung der Badspiegelhöhe 14 in der Kokil­le 25 von einer Sollwerthöhe kein, mehr oder weniger Argon in die ausströmende Schmelze unter entsprechender Zurückhaltung derselben einblasbar ist. Letztgenannte Maßnahme kann auch zu­sätzlich zu der Argon-Einblasung durch den Stopfen 11 vorge­sehen sein.Argon can also be introduced through a gas line arranged in the bottom of the metallurgical vessel 13 and opening into the area of the bottom opening 12, which is also coupled to a controllable valve, so that depending on the deviation of the bath level 14 in the mold 25 from at a setpoint value, no, more or less argon can be blown into the outflowing melt with appropriate restraint. The latter measure can also be provided in addition to the argon injection through the plug 11.

Um die Ansteuerung der optimalen Argonmenge zu beschleunigen, ist es denkbar, den Badspiegelsensor 20 mit einer Tendenzer­kennungseinrichtung (nicht dargestellt) zu koppeln, durch die die Geschwindigkeit der Badspiegeländerung in der Kokille 25 festgestellt wird und durch die in Abhängigkeit von der fest­gestellten Änderungsgeschwindigkeit das Regelventil 19 steuer­bar ist, und zwar so, daß die Änderung der Badspiegelhöhe 14 in Tendenzrichtung verzögert wird.In order to accelerate the actuation of the optimal amount of argon, it is conceivable to couple the bath level sensor 20 to a tendency detection device (not shown) by means of which the speed of the bath level change in the mold 25 is determined and by the control valve 19 as a function of the determined rate of change is controllable in such a way that the change in the bath level height 14 is delayed in the direction of tendency.

Vorzugsweise erfolgt die Ansteuerung des Regelventils 19 takt­ weise (digital).The control valve 19 is preferably actuated in cycles wise (digital).

Statt der vorbeschriebenen Badspiegel-Meßeinrichtung mit Stab­strahler und Szintillationszähler können auch elektromagne­tische oder optische Badspiegel-Meßeinrichtungen herkömmlicher art vorgesehen sein. Diesbezüglich handelt es sich um eine an sich bekannte Einrichtung.Instead of the above-described bath level measuring device with rod emitter and scintillation counter, electromagnetic or optical bath level measuring devices of conventional type can also be provided. In this regard, it is a known device.

Sämtliche in den Anmeldungsunterlagen offenbarten Merkmale werden als erfindungswesentlich beansprucht, soweit sie einzeln oder in Kombination gegenüber dem Stand der Technik neu sind.All of the features disclosed in the application documents are claimed as essential to the invention, insofar as they are new compared to the prior art, individually or in combination.

Bezugszeichenliste:Reference symbol list:

  • 10 Schmelze10 melt
  • 11 Stopfen11 plugs
  • 12 Bodenöffnung12 bottom opening
  • 13 metallurgisches Gefäß13 metallurgical vessel
  • 14 Badspiegelhöhe14 bath mirror height
  • 15 Pfeil15 arrow
  • 16 Verbindungsleitung16 connecting line
  • 17 Inertgas-, insbesondere Argonquelle17 Inert gas, in particular argon source
  • 18 Austrittsöffnung18 outlet opening
  • 19 Drosselventil19 throttle valve
  • 20 Sensor (insbesondere Szintillationszähler)20 sensor (especially scintillation counter)
  • 21 Ventilkörper21 valve body
  • 22 Signalleitung22 signal line
  • 23 Doppelpfeil23 double arrow
  • 24 Antrieb24 drive
  • 25 Stranggießkokille25 continuous casting mold
  • 26 Tauchrohr26 immersion tube
  • 27 Stabstrahler27 rod spotlights
  • 28 Strömungspfeil28 flow arrow
  • 29 Traverse29 traverse
  • 32 Stütze32 support
  • 31 Längsbohrung31 longitudinal bore
  • 32 Komparator32 comparator
  • 33 Stopfenantriebssignal33 Plug drive signal

Claims (7)

1. Verfahren zum Füllen einer Stranggießkokille (25) mit me­tallischer Schmelze, bei dem die Schmelze (10) durch eine mittels eines auf- und abbewegbaren Stopfens (11 ) ver­schließbare Bodenöffnung (12) eines metallurgischen Gefäßes (13), insbesondere einer Verteilerrinne, geregelt in die Stranggießkokille gegossen wird, wobei während des Füllens der Stranggießkokille der Stopfen (11 ) vorgegebene, insbe­sondere von der Badspiegelhöhe (14) in der Stranggießko­kille (25) abhängige Auf- und Abwärtsbewegungen ausführt, und wobei ferner während des Füllens der Stranggießkokille (25) am der Bodenöffnung (12) zugewandten Ende des Stopfens (11 ) Inertgas, insbesondere Argon, einblasbar ist (Pfeile 15),
dadurch gekennzeichnet, daß
das Inertgas, insbesondere Argon, in Abhängigkeit von der Badspiegelhöhe (14) in der Kokille (25) eingeblasen wird, derart, daß bei im Verhältnis zu einem vorgegebenen Soll­wert steigendem Badspiegel mehr Argon eingeblasen wird als bei sinkendem Badspiegel, so daß bei vorgegebenem Öffnungs­grad des Stopfens (11 ) die Badspiegelhöhe im wesentlichen konstant gehalten wird.
1. A method for filling a continuous casting mold (25) with a metallic melt, in which the melt (10) is regulated by a bottom opening (12) of a metallurgical vessel (13), in particular a distribution channel, which can be closed by means of a stopper (11) which can be moved up and down is poured into the continuous casting mold, wherein during the filling of the continuous casting mold the stopper (11), in particular dependent on the bath level height (14) in the continuous casting mold (25), performs upward and downward movements, and furthermore during the filling of the continuous casting mold (25) inert gas, in particular argon, can be blown in at the end of the stopper (11) facing the bottom opening (12) (arrows 15),
characterized in that
the inert gas, in particular argon, is blown into the mold (25) as a function of the bath level (14), in such a way that more argon is blown in when the bath level rises in relation to a predetermined setpoint than when the bath level falls, so that at a predetermined degree of opening the Stopper (11) the bath level is kept substantially constant.
2. Verfahren, insbesondere nach Anspruch 1,
dadurch gekennzeichnet, daß durch eine in den Bereich der Bodenöffnung (12) mündende Leitung - gegebenenfalls zusätz­lich - Inertgas, insbesondere Argon, zur Regelung der Bad­spiegelhöhe (14) in der Kokille (25) eingeblasen wird un­ter entsprechender Drosselung des freien Strömungsquer­schnitts im Bereich der Bodenöffnung (12) des metallurgi­schen Gefäßes (13).
2. The method, in particular according to claim 1,
characterized in that an opening into the area of the bottom opening (12) - optionally additionally - inert gas, in particular argon, for controlling the bath level height (14) in the mold (25) is blown in, with corresponding throttling of the free flow cross-section in the area of the bottom opening (12) of the metallurgical vessel (13).
3. Vorrichtung zum Füllen einer Stranggießkokille (25) mit metallischer Schmelze (10), bei der die Schmelze durch eine mittels eines auf- und abbewegbaren Stopfens (11) ver­schließbare Bodenöffnung (12) eines metallurgischen Gefäßes (13), insbesondere einer Verteilerrinne, geregelt in die Stranggießkokille gießbar ist, wobei der Stopfen (11) am der Bodenöffnung (12) zugewandten Ende eine über eine Lei­tung (16, 31) mit einer Inertgas-, insbesondere Argonquel­le (17), verbundene Austrittsöffnung (18) aufweist, durch die hindurch Inertgas, insbesondere Argon, in die ausströ­mende Schmelze blasbar ist,
dadurch gekennzeichnet, daß
in der Verbindungsleitung (16) zur Inertgas-, insbesondere Argonquelle (17) ein Regelventil (19) angeordnet ist, des­sen Öffnungsgrad in Abhängigkeit von der mittels eines Sen­sors (20) festgestellten Badspiegelhöhe (14) in der Kokil­le (25) einstellbar ist.
3. Device for filling a continuous casting mold (25) with metallic melt (10), in which the melt through a The bottom opening (12) of a metallurgical vessel (13), in particular a distribution channel, can be closed and poured into the continuous casting mold in a controlled manner by means of a stopper (11) which can be moved up and down, the stopper (11) at the end facing the bottom opening (12) being connected via a Line (16, 31) having an outlet opening (18) connected to an inert gas, in particular argon source (17) through which inert gas, in particular argon, can be blown into the outflowing melt,
characterized in that
A control valve (19) is arranged in the connecting line (16) to the inert gas, in particular argon source (17), the degree of opening of which can be set in the mold (25) depending on the bath level height (14) determined by means of a sensor (20).
4. Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet, daß
der Ventilkörper (21 ) des Regelventils (19) durch einen mechanischen, pneumatischen, hydraulischen oder elektromo­torischen Antrieb (24) bewegbar ist, wobei der Antrieb (24) auf ein vom Badspiegelsensor (20) geliefertes Signal (Signalleitung 22) reagiert, derart, daß bei im Verhält­nis zu einem vorgegebenen Sollwert steigendem Badspiegel (14) der Öffnungsgrad des Ventils (19) vergrößert wird, und umgekehrt.
4. The device according to claim 3,
characterized in that
the valve body (21) of the control valve (19) can be moved by a mechanical, pneumatic, hydraulic or electromotive drive (24), the drive (24) reacting to a signal (signal line 22) supplied by the bath level sensor (20) such that when the bath level (14) increases in relation to a predetermined setpoint, the opening degree of the valve (19) is increased, and vice versa.
5. Vorrichtung nach Anspruch 3 oder 4,
dadurch gekennzeichnet, daß
durch den Badspiegelsensor (20) eine Badspiegelober- und Badspiegeluntergrenze festgelegt ist, zwischen denen der Badspiegelsollwert liegt, wobei erst nach Überschreiten der Ober- und Untergrenze eine kompensierende Stopfenbewegung (Doppelpfeil 23) eingeleitet wird.
5. The device according to claim 3 or 4,
characterized in that
the bath level sensor (20) defines a bath level upper and lower level, between which the bath level setpoint lies, a compensating stopper movement (double arrow 23) being initiated only after the upper and lower limits have been exceeded.
6. Vorrichtung, insbesondere nach einem der Ansprüche 3 bis 5,
dadurch gekennzeichnet, daß
in den Bereich der Bodenöffnung (12) des metallurgischen Ge­fäßes (13) mindestens eine - gegebenenfalls weitere - Lei­tung zum Einblasen von Inertgas, insbesondere Argon, mün­det, in der ein regelbares Ventil angeordnet ist, so daß in Abhängigkeit von der Abweichung der Badspiegelhöhe (14) in der Kokille (25) von einer Sollwerthöhe kein, mehr oder weniger Argon in die durch die Bodenöffnung (12) hindurch ausströmende Schmelze (10) einblasbar ist.
6. The device, in particular according to one of claims 3 to 5,
characterized in that
In the area of the bottom opening (12) of the metallurgical vessel (13) at least one - possibly further - line for blowing in inert gas, in particular argon, opens, in which a controllable valve is arranged, so that depending on the deviation of the bath level height (14 ) no, more or less argon can be blown into the melt (10) flowing out through the bottom opening (12) in the mold (25) from a setpoint value.
7. Vorrichtung nach einem der Ansprüche 3 bis 6,
dadurch gekennzeichnet, daß
der Badspiegelsensor (20) mit einer Tendenzerkennungsein­richtung gekoppelt ist, durch die in Abhängigkeit von der Geschwindigkeit der Badspiegeländerung das Regelventil (19) steuerbar ist.
7. Device according to one of claims 3 to 6,
characterized in that
the bath level sensor (20) is coupled to a tendency detection device, by means of which the control valve (19) can be controlled as a function of the speed of the bath level change.
EP90106625A 1989-05-29 1990-04-06 Method of and installation for filling a continuous casting mold with molten metal Expired - Lifetime EP0400302B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3917403 1989-05-29
DE3917403A DE3917403C2 (en) 1989-05-29 1989-05-29 Method and device for filling a continuous casting mold with a metallic melt

Publications (3)

Publication Number Publication Date
EP0400302A2 true EP0400302A2 (en) 1990-12-05
EP0400302A3 EP0400302A3 (en) 1992-04-22
EP0400302B1 EP0400302B1 (en) 1995-08-02

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Application Number Title Priority Date Filing Date
EP90106625A Expired - Lifetime EP0400302B1 (en) 1989-05-29 1990-04-06 Method of and installation for filling a continuous casting mold with molten metal

Country Status (4)

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EP (1) EP0400302B1 (en)
AT (1) ATE125740T1 (en)
DE (2) DE3917403C2 (en)
ES (1) ES2077601T3 (en)

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CN114540668A (en) * 2022-01-21 2022-05-27 中航上大高温合金材料股份有限公司 Smelting process for producing high-temperature alloy GH4049 difficult to deform from high-purity return material
CN116855920A (en) * 2023-09-05 2023-10-10 山西中设华晋铸造有限公司 Steel strip casting process

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DE19852289A1 (en) * 1998-11-13 2000-05-25 Messer Austria Gmbh Gumpoldski Process and device for regulating pouring jets
DE102009004613B4 (en) 2009-01-15 2020-01-02 Bayerische Motoren Werke Aktiengesellschaft Reservoir for liquid casting material, in particular a stopper pan, and method for filling a stopper pan
CN104001892B (en) * 2014-06-12 2017-08-11 鞍钢股份有限公司 Method for adjusting argon flow of tundish
EP4192640A1 (en) * 2020-08-06 2023-06-14 SMS Group GmbH Casting nozzle or casting distributor, assembly and method for heating and/or preheating a casting nozzle

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JPS6195756A (en) * 1984-10-16 1986-05-14 Nippon Steel Corp Stopper for gas blowing tundish
EP0320481A1 (en) * 1987-11-25 1989-06-14 Vesuvius International Corporation Gas permeable stopper rod
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114540668A (en) * 2022-01-21 2022-05-27 中航上大高温合金材料股份有限公司 Smelting process for producing high-temperature alloy GH4049 difficult to deform from high-purity return material
CN114540668B (en) * 2022-01-21 2022-10-25 中航上大高温合金材料股份有限公司 Smelting process for producing high-temperature alloy GH4049 difficult to deform from high-purity return material
CN116855920A (en) * 2023-09-05 2023-10-10 山西中设华晋铸造有限公司 Steel strip casting process
CN116855920B (en) * 2023-09-05 2023-11-21 山西中设华晋铸造有限公司 Steel strip casting process

Also Published As

Publication number Publication date
EP0400302B1 (en) 1995-08-02
DE3917403C2 (en) 1998-02-05
EP0400302A3 (en) 1992-04-22
DE3917403A1 (en) 1990-12-06
ES2077601T3 (en) 1995-12-01
ATE125740T1 (en) 1995-08-15
DE59009459D1 (en) 1995-09-07

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