EP0019114B1 - Method and apparatus for the continuous casting of several strands - Google Patents

Method and apparatus for the continuous casting of several strands Download PDF

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Publication number
EP0019114B1
EP0019114B1 EP80102205A EP80102205A EP0019114B1 EP 0019114 B1 EP0019114 B1 EP 0019114B1 EP 80102205 A EP80102205 A EP 80102205A EP 80102205 A EP80102205 A EP 80102205A EP 0019114 B1 EP0019114 B1 EP 0019114B1
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EP
European Patent Office
Prior art keywords
mould
bath level
moulds
strands
speed
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EP80102205A
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German (de)
French (fr)
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EP0019114A1 (en
Inventor
Markus Schmid
Hans Gloor
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SMS Concast AG
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Concast Holding AG
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Priority to AT80102205T priority Critical patent/ATE2877T1/en
Publication of EP0019114A1 publication Critical patent/EP0019114A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
    • B22D11/204—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by using optical means
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/147—Multi-strand plants

Definitions

  • the invention relates to a process for the continuous casting of several strands, steel being poured into molds from at least one intermediate vessel, the strands being formed being pulled out of the molds at the same speed, cooled and the bath levels in the molds being kept at the desired heights, and a device for Execution of the procedure.
  • a separate drive unit is usually assigned to each strand, so that they can be driven at an individual strand pull-out speed.
  • drive units with hollow drive rollers have become known (DE-A 2 702 894), through which drive shafts for adjacent strands are guided.
  • Such drive units allow a pull-out speed that is adapted to each strand, but are structurally complicated and very expensive.
  • the invention has for its object to provide a method for the simultaneous casting of several strands with a small strand spacing, in which the cast strands are pulled out by a common drive unit at the same speed and which works more simply and reliably. Furthermore, the method should be applicable for small strand formats and be automatable by simple means. The operating costs for the control devices and their maintenance as well as the personnel costs for the casting operation should also be minimal.
  • this object is achieved in that the pull-out speed is controlled as a function of the reference inflow quantity regulated per unit of time and flows into a first mold, and the inflow quantity in at least one further mold is regulated by means of an inflow control device controlled by a bath level measuring device as a function of this pull-out speed.
  • This methodology results in a new control concept for the casting of multiple strands with a small strand spacing according to the preamble, wherein the bath level height of a first strand is achieved via the strand pull-out speed and at least one further strand via a control device on the pouring nozzle.
  • An inflow control into the mold of the first strand is not necessary. This results in a reduced operational expenditure for equipment and maintenance of regulating organs and the personnel expenditure for the foundry operation.
  • the device according to the invention is characterized in that the bath level measuring device of the first mold, which has an uncontrolled melt inflow, is electrically connected to a regulating device for the speed of the common pull-out unit, and that the bath level measuring device of the further molds is electrically connected to regulating devices for the inflow amount.
  • the reference inflow quantity flowing into the first mold is essentially determined by the shape and dimension of a closure-free pouring nozzle opening.
  • a certain change in the reference supply quantity can be achieved by selecting the bath level in the intermediate vessel.
  • Such an arrangement allows a substantial reduction in closure and Re organized.
  • the pouring nozzle can be closed using a copper stopper by freezing.
  • the pouring jet forming in the pouring nozzle of the intermediate vessel can advantageously be acted upon by constricting electromagnetic fields.
  • a control device for the inflow quantity consists of electromagnetic coils constricting the pouring jet.
  • the pouring jet forming in the pouring nozzle of the tundish for the further molds can be regulated by inflowing gases.
  • the corresponding inflow quantity control consists of a gas supply device opening into the pouring nozzle and an associated regulation.
  • the two control methods mentioned work without mechanical force devices, such as hydraulic cylinders, and without refractory parts, such as plugs or slide plates. This reduces maintenance and extends the casting time per sequence cast due to the lack of wear on such refractory parts. Furthermore, a control that is simpler than the known plug or slide controls can be selected for the control of the magnetic force field or for the gas quantity.
  • the first and the further mold can advantageously be arranged in a common frame and this frame can be connected to an oscillation device.
  • the molds are oscillated in synchronism.
  • FIG. 1 an intermediate vessel 1 with two pouring nozzles 2, 2 'is arranged above two molds 3, 3' fastened in a mold frame 4.
  • Each mold is provided with a bath level measuring device 6, 6 ', which are shown in this example as optical measuring devices. Of course, any other bath level measuring device can also be used instead of the optical one.
  • Downstream of the molds is a secondary cooling zone 8 and then a common pull-out unit 10 for the two strands 9, 9 '.
  • the bath level measuring device 6 of the first mold 3 is electrically connected to a controller 11 for the pull-out speed of the pull-out unit 10. If the metal flow from the pouring nozzle 2 is too large, the control 11 automatically increases the pull-out speed for the two strands 9, 9 'and vice versa.
  • the bath level measuring device 6 'of the second mold 3' or further molds arranged in the mold frame 4 is electrically connected to a control device for the inflow quantity from the pouring nozzle 2 '.
  • This control device consists of a control 13 and a coil 15 which acts on the casting stream which is formed for the mold 3 'by means of a constricting electromagnetic field. This constricting effect regulates the amount of metal flowing through.
  • the method according to the invention presupposes that the two strands 9, 9 'at the same speed, i. H. from a single pull-out unit 10, are pulled out of the mold.
  • the pull-out speed is controlled as a function of the reference inflow quantity flowing into the first mold 3 per unit of time, and the inflow quantity in the further mold 3 'is regulated depending on the pull-out speed via the' bath level measuring device 6 ', the controller 13 and the electromagnetic coil 15.
  • the reference inflow quantity flowing into the first mold 3 is essentially only determined by the shape and dimensions of the non-closure pouring nozzle 2. Instead of another mold 3 ', additional molds can be present.
  • the flow cross section of the pouring nozzle 2 for the reference inflow quantity into the first mold 3 is advantageously chosen to be approximately 10% smaller than the flow cross section of the pouring nozzle 2 'for the further mold 3'.
  • the bath level measuring devices in the molds can measure a very large height range and devices are provided which measure and compare the rate of rise of the bath level in the two molds 3, 3 'during casting can. With such a comparison signal, it is possible to determine different inflow quantities at an early stage and to control the electromagnetic coil 15 before the target bath level is reached, to enable smooth start-up even with small formats.
  • a throttle device in the form of an electromagnetic coil 21 is assigned to a pouring nozzle 2 of an intermediate vessel.
  • the coil 21 generates a force field with an effective direction 22 against the pouring jet.
  • the force field and thus the outflow quantity from the nozzle 2 change.
  • the throttling with the coil 21 is only effective in a certain range from the maximum flow rate.
  • a copper plug can be used to close the nozzle.
  • a pouring nozzle 31 is equipped with a throttle device in the form of a gas supply 32 and a controller 33 for the amount of gas.
  • the controller 33 is in turn connected to the corresponding bath level measuring device.
  • the injected inert gas is intended to disrupt the inflow flow in the inlet funnel in order to throttle the inflow amount.
  • throttle devices instead of the throttle devices described, other throttle devices can also be used.
  • the oscillation movement of the mold can be replaced, for example, by applying a vibration movement or ultrasonic waves.

Abstract

During the continuous casting of at least two strands, withdrawn with the same speed from the continuous casting molds, the withdrawal speed for both strands should be adjusted in accordance with the quantity of cast metal, typically steel, infed to the first continuous casting mold i.e. also the level of molten metal therein. The infed quantity of steel is regulated in at least one further continuous casting mold as a function of such withdrawal speed or velocity.

Description

Die Erfindung betrifft ein Verfahren zum Stranggiessen von mehreren Strängen, wobei aus mindestens einem Zwischengefäss Stahl in Kokillen gegossen wird, die sich bildenden Stränge mit gleicher Geschwindigkeit aus den Kokillen ausgezogen, gekühlt und die Badspiegel in den Kokillen auf gewünschten Höhen gehalten werden sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a process for the continuous casting of several strands, steel being poured into molds from at least one intermediate vessel, the strands being formed being pulled out of the molds at the same speed, cooled and the bath levels in the molds being kept at the desired heights, and a device for Execution of the procedure.

Bei Mehrstranganlagen wird üblicherweise jedem Strang ein eigenes Treibaggregat zugeordnet, so dass diese mit einer individuellen Strangausziehgeschwindigkeit gefahren werden können. Um die Abstände zwischen den Strängen klein zu halten, sind Treibaggregate mit hohlen Treibrollen bekannt geworden (DE-A 2 702 894), durch welche Antriebswellen für benachbarte Stränge geführt werden. Solche Treibaggregate erlauben eine jedem Strang angepasste Ausziehgeschwindigkeit, sind aber von der Konstruktion her kompliziert und sehr kostspielig.In the case of multi-strand systems, a separate drive unit is usually assigned to each strand, so that they can be driven at an individual strand pull-out speed. In order to keep the distances between the strands small, drive units with hollow drive rollers have become known (DE-A 2 702 894), through which drive shafts for adjacent strands are guided. Such drive units allow a pull-out speed that is adapted to each strand, but are structurally complicated and very expensive.

Es ist weiter bekannt (DE-B 1 254 828), Plattenkokillen bei Brammenanlagen mittels gekühlten Zwischenwänden zu unterteilen. Durch diese Massnahme wird es möglich, auf einer Einstrang-Brammenanlage zwei schmale Brammen oder drei Vorblöcke gleichzeitig zu giessen. Es ist dabei notwendig, dass das Zwischengefäss mit entsprechend angeordneten Bodenausgussdüsen versehen ist, von denen jeder mit einem Verschlussorgan ausgerüstet ist. Die in einer solchen Anlage erzeugten Stränge werden - bedingt durch die Konstruktion der Strangführung und des Treibers - mit der gleichen Geschwindigkeit aus der Kokille ausgezogen und in der Regel auch gemeinsam getrennt. Die Badspiegel der einzelnen Stränge werden von Hand oder mit Badspiegelregeleinrichtungen über stopfen- oder schiebergesteuerte Ausgussdüsen auf ihrer Sollhöhe gehalten. Das gleichzeitige Giessen mehrerer Stränge aus einer Plattenkokille wird in der Fachsprache Zwillings- oder Drillingsguss genannt.It is also known (DE-B 1 254 828) to divide plate molds in slab systems by means of cooled partition walls. This measure makes it possible to cast two narrow slabs or three blooms simultaneously on a single-strand slab line. It is necessary that the intermediate vessel is provided with appropriately arranged bottom pouring nozzles, each of which is equipped with a closure member. The strands produced in such a system are - due to the construction of the strand guide and the driver - pulled out of the mold at the same speed and are usually also separated together. The bath levels of the individual strands are kept at their desired height by hand or with bath level control devices via plug- or slide-controlled pouring nozzles. The simultaneous casting of several strands from a plate mold is known in the technical language as twin or triplet casting.

Der in der Praxis eingeführte Zwillingsguss wird jedoch nur zur Herstellung von schmalen Brammen oder Vorblöcken eingesetzt. Kleine Formate wie Knüppelstränge sind bis heute im Zwillingsguss nicht hergestellt worden. Einerseits ergeben sich in bezug auf Betriebssicherheit Schwierigkeiten, den Badspiegel bei höheren Giessgeschwindigkeiten auf Sollhöhe zu halten und anderseits sind kostspielige Verschluss- und Regelorgane für jeden Strang notwendig. Entsprechend einem Artikel « Zum Stand des Stahlstranggiessens in der Schweizerischen Bauzeitung, 89. Jahrgang, Heft 39, 30. Sept. 1971, Seite 977, sind die Formatbereiche wie folgt definiert : Knüppelstränge bis 160 mm vierkant, daran anschliessend Vorblockformate bis über 500 mm vierkant. Unter Brammenformaten werden Rechteckformate von 300 x 100 mm bis 2 200 x 320 mm zusammengefasst.The twin cast found in practice is only used for the production of narrow slabs or blooms. Small formats such as billet strands have not yet been produced in twin castings. On the one hand, there are difficulties with regard to operational safety in keeping the bath level at the desired level at higher casting speeds, and on the other hand, expensive closure and control elements are necessary for each strand. According to an article on the status of continuous steel casting in the Swiss Bauzeitung, 89th year, issue 39, Sept. 30, 1971, page 977, the format ranges are defined as follows: billet strands up to 160 mm square, followed by billet formats up to over 500 mm square . Rectangular formats from 300 x 100 mm to 2 200 x 320 mm are summarized under slab formats.

Ferner ist es aus der DE-A2836711 bekannt, den Badspiegel bei ungeregeltem Schmelzenzufluss über die Ausziehgeschwindigkeit zu regeln.It is also known from DE-A2836711 to regulate the bath level via the pull-out speed in the case of uncontrolled melt inflow.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum gleichzeitigen Giessen von mehreren Strängen mit kleinem Strangabstand zu schaffen, bei welchem die gegossenen Stränge von einem gemeinsamen Treibaggregat mit gleicher Geschwindigkeit ausgezogen werden und das einfacher und betriebssicherer arbeitet. Im weiteren soll das Verfahren für kleine Strangformate anwendbar und durch einfache Mittel automatisierbar sein. Ebenfalls soll der betriebliche Kostenaufwand für die Regeleinrichtungen und deren Unterhalt sowie der Personalaufwand für den Giessbetrieb minimal sein.The invention has for its object to provide a method for the simultaneous casting of several strands with a small strand spacing, in which the cast strands are pulled out by a common drive unit at the same speed and which works more simply and reliably. Furthermore, the method should be applicable for small strand formats and be automatable by simple means. The operating costs for the control devices and their maintenance as well as the personnel costs for the casting operation should also be minimal.

Diese Aufgabe wird nach dem erfindungsgemässen Verfahren dadurch gelöst, dass die Ausziehgeschwindigkeit in Abhängigkeit der pro Zeiteinheit umgeregelt in eine erste Kokille einfliessende Referenzzuflussmenge gesteuert und die Zuflussmenge in mindestens eine weitere Kokille mittels einer, von einer Badspiegelmesseinrichtung angesteuerten Zuflussregeleinrichtung in Abhängigkeit von dieser Ausziehgeschwindigkeit reguliert wird.According to the method according to the invention, this object is achieved in that the pull-out speed is controlled as a function of the reference inflow quantity regulated per unit of time and flows into a first mold, and the inflow quantity in at least one further mold is regulated by means of an inflow control device controlled by a bath level measuring device as a function of this pull-out speed.

Diese Verfahrenslehre ergibt ein neues Steuerkonzept für das Giessen von mehreren Strängen mit kleinem Strangabstand gemäss dem Oberbegriff, wobei das Halten der Badspiegelhöhe eines ersten Stranges über die Strangausziehgeschwindigkeit und mindestens eines weiteren Stranges über eine Regeleinrichtung an der Ausgussdüse erreicht wird. Eine Zuflussregelung in die Kokille des ersten Stranges ist dabei nicht notwendig. Dies ergibt einen verminderten betrieblichen Aufwand für Ausrüstung und Unterhalt von Regelorganen und des Personalaufwandes für den Giessbetrieb. Zusätzlich kann auch das Halten der Badspiegelhöhe bei kleinen Strangformaten mit hohen Giessgeschwindigkeiten im Zwillingsguss erreicht werden.This methodology results in a new control concept for the casting of multiple strands with a small strand spacing according to the preamble, wherein the bath level height of a first strand is achieved via the strand pull-out speed and at least one further strand via a control device on the pouring nozzle. An inflow control into the mold of the first strand is not necessary. This results in a reduced operational expenditure for equipment and maintenance of regulating organs and the personnel expenditure for the foundry operation. In addition, it is also possible to maintain the bath level height in small strand formats with high casting speeds in twin castings.

Die erfindungsgemässe Vorrichtung zeichnet sich dadurch aus, dass die Badspiegelmesseinrichtung der ersten, einen ungeregelten Schmelzenzufluss aufweisenden Kokille mit einer Regeleinrichtung für die Geschwindigkeit des gemeinsamen Ausziehaggregates elektrisch verbunden ist und dass die Badspiegelmesseinrichtung der weiteren Kokillen mit Regeleinrichtungen für die Zuflussmenge elektrisch verbunden ist.The device according to the invention is characterized in that the bath level measuring device of the first mold, which has an uncontrolled melt inflow, is electrically connected to a regulating device for the speed of the common pull-out unit, and that the bath level measuring device of the further molds is electrically connected to regulating devices for the inflow amount.

Die in die erste Kokille einfliessende Referenzzuflussmenge wird im wesentlichen durch Form und Abmessung einer verschlusslosen Ausgussdüsenöffnung festgelegt.The reference inflow quantity flowing into the first mold is essentially determined by the shape and dimension of a closure-free pouring nozzle opening.

Eine gewisse Aenderung der Referenzzufuhrmenge kann, wenn erforderlich, durch Wahl der Badspiegelhöhe im Zwischengefäss erreicht werden. Eine solche Anordnung erlaubt eine wesentliche Reduktion von Verschluss- und Regelorganen. Bei Störungen besteht die Möglichkeit, den Stahlstrahl mit einer Ueberlaufrinne abzuleiten und in Notfällen kann die Ausgussdüse mittels einem Kupferstopfen durch Einfrieren geschlossen werden.If necessary, a certain change in the reference supply quantity can be achieved by selecting the bath level in the intermediate vessel. Such an arrangement allows a substantial reduction in closure and Re organized. In the event of malfunctions, there is the option of diverting the steel jet with an overflow channel and in emergencies, the pouring nozzle can be closed using a copper stopper by freezing.

Anstelle von beispielsweise Stopfen- oder Schieberverschlüssen für die Regelung des Giessstrahles für die weiteren Kokillen, kann, nach einem weiteren Merkmal der Erfindung, mit Vorteil der sich in der Ausgussdüse des Zwischengefässes bildende Giessstrahl durch einschnürende elektromagnetische Felder beaufschlagt werden. Eine solche Regeleinrichtung für die Zuflussmenge besteht aus den Giessstrahl einschnürenden elektromagnetischen Spulen.Instead of, for example, stopper or slide closures for regulating the pouring jet for the further molds, according to a further feature of the invention, the pouring jet forming in the pouring nozzle of the intermediate vessel can advantageously be acted upon by constricting electromagnetic fields. Such a control device for the inflow quantity consists of electromagnetic coils constricting the pouring jet.

Alternativ kann aber auch der sich in der Ausgussdüse des Zwischengefässes bildende Giessstrahl für die weiteren Kokillen durch einströmende Gase geregelt werden. Die entsprechende Zuflussmengenregelung besteht dabei aus einer in die Ausgussdüse einmündenden Gaszuführeinrichtung und einer dazugehörigen Regelung.Alternatively, however, the pouring jet forming in the pouring nozzle of the tundish for the further molds can be regulated by inflowing gases. The corresponding inflow quantity control consists of a gas supply device opening into the pouring nozzle and an associated regulation.

Die beiden genannten Regelverfahren arbeiten ohne mechanische Kraftgeräte, wie hydraulische Zylinder, und ohne feuerfeste Teile, wie Stopfen oder Schieberplatten. Dadurch wird der Unterhalt verbilligt und die Giesszeit pro Sequenzguss wegen fehlendem Verschleiss an solchen feuerfesten Teilen verlängert. Im weiteren kann für die Steuerung des magnetischen Kraftfeldes oder für die Gasmenge eine gegenüber den bekannten Stopfen- oder Schiebersteuerungen einfachere Steuerung gewählt werden.The two control methods mentioned work without mechanical force devices, such as hydraulic cylinders, and without refractory parts, such as plugs or slide plates. This reduces maintenance and extends the casting time per sequence cast due to the lack of wear on such refractory parts. Furthermore, a control that is simpler than the known plug or slide controls can be selected for the control of the magnetic force field or for the gas quantity.

Werden sehr kleine Strangabschnitte gewählt, so können mit Vorteil die erste und die weitere Kokille in einem gemeinsamen Rahmen angeordnet und dieser Rahmen mit einer Oszillationseinrichtung verbunden werden. Die Kokillen werden dabei im Gleichlauf oszilliert.If very small strand sections are selected, the first and the further mold can advantageously be arranged in a common frame and this frame can be connected to an oscillation device. The molds are oscillated in synchronism.

Erfahrungsgemäss setzen sich in Ausgussdüsen Tonerdeablagerungen ab und verkleinern dadurch den offenen Düsenquerschnitt nach längerer Giessdauer. Bei nicht regelbaren Ausgussdüsen für die Referenzzuflussmenge ist es vorteilhaft, wenn der Durchflussquerschnitt dieser Ausgussdüse für die erste kokille etwa 10% kleiner ist als die Durchflussquerschnitte der Ausgussdüsen für die weiteren Kokillen. Störungen, die durch ungleichmässiges Zusetzen der Düsen für die erste oder die weiteren Kokillen entstehen könnten, werden durch diese Massnahme vermindert.Experience has shown that alumina deposits settle in the pouring nozzles and thus reduce the open nozzle cross-section after a long casting time. In the case of non-controllable pouring nozzles for the reference inflow quantity, it is advantageous if the flow cross-section of this pouring nozzle for the first mold is approximately 10% smaller than the flow cross-sections of the pouring nozzles for the further molds. Disruptions that could result from uneven clogging of the nozzles for the first or the further molds are reduced by this measure.

Die Erfindung soll anhand der nachfolgend beschriebenen Beispiele erläutert werden. Dabei zeigen :

  • Figur 1 eine schematisch dargestellte Seitenansicht einer Stranggiessanlage,
  • Figur 2 einen Schnitt durch eine Ausgussdüse mit elektromagnetischer Regeleinheit und
  • Figur 3 einen Schnitt durch eine Ausgussdüse mit Gaszuführeinrichtung als Regeleinheit.
The invention is illustrated by the examples described below. Show:
  • FIG. 1 shows a schematically illustrated side view of a continuous caster,
  • Figure 2 shows a section through a pouring nozzle with an electromagnetic control unit and
  • Figure 3 shows a section through a pouring nozzle with gas supply device as a control unit.

In Fig. 1 ist ein Zwischengefäss 1 mit zwei Ausgussdüsen 2, 2' oberhalb von zwei in einem Kokillenrahmen 4 befestigten Kokillen 3, 3' angeordnet. Jede Kokille ist mit je einer Badspiegelmesseinrichtung 6, 6' versehen, die in diesem Beispiel als optische Messeinrichtungen dargestellt sind. Es kann selbstverständlich auch jede andere Badspiegelmesseinrichtung anstelle der optischen verwendet werden. Den Kokillen nachgeordnet ist eine Sekundärkühlzone 8 und anschliessend daran ein gemeinsamens Ausziehaggregat 10 für die beiden Stränge 9, 9'.In Fig. 1, an intermediate vessel 1 with two pouring nozzles 2, 2 'is arranged above two molds 3, 3' fastened in a mold frame 4. Each mold is provided with a bath level measuring device 6, 6 ', which are shown in this example as optical measuring devices. Of course, any other bath level measuring device can also be used instead of the optical one. Downstream of the molds is a secondary cooling zone 8 and then a common pull-out unit 10 for the two strands 9, 9 '.

Die Badspiegelmesseinrichtung 6 der ersten Kokille 3 ist mit einer Steuerung 11 für die Ausziehgeschwindigkeit des Ausziehaggregates 10 elektrisch verbunden. Bei zu grossem Metallzufluss aus der Ausgussdüse 2 wird durch die Steuerung 11 automatisch die Ausziehgeschwindigkeit für die beiden Stränge 9, 9' erhöht und umgekehrt. Die Badspiegelmesseinrichtung 6' der zweiten Kokille 3' oder weiterer im Kokillenrahmen 4 angeordneten Kokillen ist mit einer Regeleinrichtung für die Zuflussmenge aus der Ausgussdüse 2' elektrisch verbunden.The bath level measuring device 6 of the first mold 3 is electrically connected to a controller 11 for the pull-out speed of the pull-out unit 10. If the metal flow from the pouring nozzle 2 is too large, the control 11 automatically increases the pull-out speed for the two strands 9, 9 'and vice versa. The bath level measuring device 6 'of the second mold 3' or further molds arranged in the mold frame 4 is electrically connected to a control device for the inflow quantity from the pouring nozzle 2 '.

Diese Regeleinrichtung besteht aus einer Steuerung 13 und einer Spule 15, die den sich bildenden Giessstrahl für die Kokille 3' mittels einem einschnürenden elektromagnetischen Feld beaufschlägt. Durch diesen Einschnüreffekt wird die durchfliessende Metallmenge geregelt.This control device consists of a control 13 and a coil 15 which acts on the casting stream which is formed for the mold 3 'by means of a constricting electromagnetic field. This constricting effect regulates the amount of metal flowing through.

Das erfindungsgemässe Verfahren setzt voraus, dass die beiden Stränge 9, 9' mit der gleichen Geschwindigkeit, d. h. von einem einzigen Ausziehaggregat 10, aus der Kokille ausgezogen werden. Die Ausziehgeschwindigkeit wird dabei in Abhängigkeit der pro Zeiteinheit in die erste Kokille 3 einfliessenden Referenzzuflussmenge gesteuert und die Zuflussmenge in der weiteren Kokille 3' wird in Abhängigkeit von der Ausziehgeschwindigkeit über die ' Badspiegelmesseinrichtung 6', der Steuerung 13 und der elektromagnetischen Spule 15 reguliert. Die in die erste Kokille 3 einfliessende Referenzzuflussmenge ist im wesentlichen nur durch Form und Abmessung der verschlusslosen Ausgussdüse 2 festgelegt. Anstelle der einen weiteren Kokille 3' können zusätzliche Kokillen vorhanden sein.The method according to the invention presupposes that the two strands 9, 9 'at the same speed, i. H. from a single pull-out unit 10, are pulled out of the mold. The pull-out speed is controlled as a function of the reference inflow quantity flowing into the first mold 3 per unit of time, and the inflow quantity in the further mold 3 'is regulated depending on the pull-out speed via the' bath level measuring device 6 ', the controller 13 and the electromagnetic coil 15. The reference inflow quantity flowing into the first mold 3 is essentially only determined by the shape and dimensions of the non-closure pouring nozzle 2. Instead of another mold 3 ', additional molds can be present.

Der Durchflussquerschnitt der Ausgussdüse 2 für die Referenzzuflussmenge in die erste Kokille 3 wird mit Vorteil etwa 10 % kleiner als der Durchflussquerschnitt der Ausgussdüse 2' für die weitere Kokille 3' gewählt.The flow cross section of the pouring nozzle 2 for the reference inflow quantity into the first mold 3 is advantageously chosen to be approximately 10% smaller than the flow cross section of the pouring nozzle 2 'for the further mold 3'.

Die erste Kokille 3 und die weitere Kokille 3' sind über den Kokillenrahmen 4 mit einer Oszillationseinrichtung 17 verbunden. Beide Kokillen 3, 3' oszillieren somit im Gleichlauf.The first mold 3 and the further mold 3 'are connected to an oscillation device 17 via the mold frame 4. Both molds 3, 3 'thus oscillate in synchronism.

Um das Angiessen auf einer solchen Stranggiessanlage zu erleichtern, ist es von Vorteil, wenn die Badspiegelmesseinrichtungen in den Kokillen einen sehr grossen Höhenbereich messen können und Einrichtungen vorgesehen sind, die die Steiggeschwindigkeit der Badspiegel in den beiden Kokillen 3, 3' beim Angiessen messen und vergleichen können. Mittels einem solchen Vergleichssignal ist es möglich, unterschiedliche Zuflussmengen frühzeitig festzustellen und die elektromagnetische Spule 15 vor Erreichen der Sollbadspiegelhöhe anzusteuern, um dadurch ein ströungsfreies Anfahren auch bei kleinen Formaten zu ermöglichen.In order to facilitate casting on such a continuous caster, it is advantageous if the bath level measuring devices in the molds can measure a very large height range and devices are provided which measure and compare the rate of rise of the bath level in the two molds 3, 3 'during casting can. With such a comparison signal, it is possible to determine different inflow quantities at an early stage and to control the electromagnetic coil 15 before the target bath level is reached, to enable smooth start-up even with small formats.

In Fig. 2 ist einer Ausgussdüse 2 eines Zwischengefässes eine Drosseleinrichtung in Form einer elektromagnetischen Spule 21 zugeordnet. Die Spule 21 erzeugt ein Kraftfeld mit einer Wirkrichtung 22 gegen den Giessstrahl. In Abhängigkeit der Stromstärke in der Spule 21 verändert sich das kraftfeld und dadurch die Ausflussmenge aus der Düse 2. Die Drosselung mit der Spule 21 ist von der maximalen Durchflussmenge her gesehen nur in einem bestimmten Bereich wirksam. Zum Verschliessen der Düse kann in einem Notfall ein Kupferstopfen verwendet werden.In FIG. 2, a throttle device in the form of an electromagnetic coil 21 is assigned to a pouring nozzle 2 of an intermediate vessel. The coil 21 generates a force field with an effective direction 22 against the pouring jet. Depending on the current strength in the coil 21, the force field and thus the outflow quantity from the nozzle 2 change. The throttling with the coil 21 is only effective in a certain range from the maximum flow rate. In an emergency, a copper plug can be used to close the nozzle.

In Fig. 3 ist eine Ausgussdüse 31 mit einer Drosseleinrichtung in Form einer Gaszuführung 32 und einer Steuerung 33 für die Gasmenge ausgestattet. Die Steuerung 33 ist ihrerseits mit der entsprechenden Badspiegelmesseinrichtung verbunden. Durch das eingepresste inerte Gas soll die Zuflussströmung im Einlauftrichter gestört werden, um eine Drosselung der Zuflussmenge zu erreichen.In Fig. 3, a pouring nozzle 31 is equipped with a throttle device in the form of a gas supply 32 and a controller 33 for the amount of gas. The controller 33 is in turn connected to the corresponding bath level measuring device. The injected inert gas is intended to disrupt the inflow flow in the inlet funnel in order to throttle the inflow amount.

Anstelle der beschriebenen Drosselvorrichtungen können auch andere Drosselvorrichtungen verwendet werden.Instead of the throttle devices described, other throttle devices can also be used.

Die Oszillationsbewegung der Kokille kann beispielsweise durch Aufbringen einer Vibrationsbewegung oder von Ultraschallwellen ersetzt werden.The oscillation movement of the mold can be replaced, for example, by applying a vibration movement or ultrasonic waves.

Claims (9)

1. A method of continuous casting a plurality of strands, wherein steel is poured from at least one tundish (1) into moulds (3, 3'), the strands (9, 9') that form are withdrawn from the moulds (3, 3') at the same speed and are cooled, and the molten metal in the moulds (3, 3') is maintained at the required bath level, characterized in that the speed of withdrawal is controlled in dependence on the reference feed quantity which flows into the first mould (3) during each unit of time, and the quantity fed into at least one further mould (3') is regulated in dependence upon the common speed of withdrawal by means of a feed- regulating means (13) triggered by a means (6') for measuring the bath level.
2. A method according to claim 1, characterized in that the casting stream for the further mould (3'), that forms in the discharge nozzle (2') of the tundish (1), is acted upon by constricting electromagnetic fields.
3. A method according to claim 1, characterized in that the casting stream for the further mould (3'), that forms in the discharge nozzle (2') of the tundish (1), is regulated by inflowing gases.
4. A method according to any one of claims 1 to 3, characterized in that the first mould (3) and the further mould (3') oscillate in unison.
5. Apparatus for performing the method of any one of claims 1 to 4, wherein at least one tundish (1) with at least two discharge nozzles (2, 2') is arranged above at least two moulds (3, 38) provided with means (6, 6') for measuring the bath level, and a secondary cooling means (8) as well as a withdrawal unit (10) are arranged downstream of the moulds (3, 3'), characterized in that the means (6) for measuring bath level in the first mould (3), having an uncontrolled molten-metal feed, is electrically connected to a means (11) for controlling the speed of the common withdrawal unit (10), and in that the means (6') for measuring the bath level in the further mould (3') is electrically connected to meansfor regulating the feed quantity.
6. Apparatus according to claim 5, characterized in that the means for regulating the feed quantity consists of electromagnetic coils (15, 21) surrounding the casting stream.
7. Apparatus according to claim 5, characterized in that the means for regulating the feed quantity consists of a gas-supply means (32) delivering into the discharge nozzle, and of a control means (33) for the quantity of gas.
8. Apparatus according to any one of claims 5 to 7, characterized in that the flow cross-section of the discharge nozzle (2) for the reference quantity fed into the first mould (3) is approximately 10 % less than the flow cross-section of the discharge nozzles (2', 31) for the further mould (3').
9. Apparatus according to any one of claims 5 to 8, characterized in that the first mould (3) and the further mould (3') are arranged in a common mould frame (4), and this frame (4) is connected to an oscillating means (17).
EP80102205A 1979-04-27 1980-04-24 Method and apparatus for the continuous casting of several strands Expired EP0019114B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80102205T ATE2877T1 (en) 1979-04-27 1980-04-24 METHOD AND DEVICE FOR CONTINUOUS CASTING OF MULTIPLE STRANDS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3975/79 1979-04-27
CH397579A CH639575A5 (en) 1979-04-27 1979-04-27 METHOD AND DEVICE FOR CONTINUOUSLY MOLDING SEVERAL STRINGS.

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EP0019114A1 EP0019114A1 (en) 1980-11-26
EP0019114B1 true EP0019114B1 (en) 1983-03-30

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US (1) US4349066A (en)
EP (1) EP0019114B1 (en)
JP (1) JPS55144364A (en)
AT (1) ATE2877T1 (en)
CA (1) CA1151390A (en)
CH (1) CH639575A5 (en)
DE (1) DE3062505D1 (en)

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US4498521A (en) * 1981-05-26 1985-02-12 Kaiser Aluminum & Chemical Corporation Molten metal level control in continuous casting
US4567935A (en) * 1981-05-26 1986-02-04 Kaiser Aluminum & Chemical Corporation Molten metal level control in continuous casting
CH659783A5 (en) * 1983-03-29 1987-02-27 Metacon Ag METHOD AND DEVICE FOR CONTROLLING A CONTINUOUS CASTING SYSTEM.
DE3317474A1 (en) * 1983-05-13 1984-11-15 Russ-Elektroofen Produktions-Gesellschaft mbH & Co KG, 5000 Köln LOW-PRESSURE CASTING METHOD AND DEVICE FOR ITS IMPLEMENTATION
EP0149447A3 (en) * 1983-12-29 1986-10-22 VOEST-ALPINE Aktiengesellschaft Method of controlling the level in continuous casting moulds of a multiple-strand continuous casting plant, and arrangement for carrying out the method
DE3538222A1 (en) * 1985-10-26 1987-05-27 Metacon Ag METHOD FOR STARTING UP A CONTINUOUS CASTING SYSTEM WITH MULTIPLE STRINGS
DE3432611C2 (en) * 1984-09-05 1986-09-04 Metacon AG, Zürich Procedure for starting up a continuous caster with several strands
WO1988000867A1 (en) * 1986-08-08 1988-02-11 Kurzinski Cass R Cluster casting machine and method
SE460103B (en) * 1987-03-26 1989-09-11 Asea Ab DEVICE FOR CONTROL OF CASTING PROCEDURES
CN107282906A (en) * 2016-04-01 2017-10-24 南京梅山冶金发展有限公司 Determine that continuous casting is mixed to pour the mixed of process and pour rate and the experimental method of time
SI3519124T1 (en) * 2016-09-27 2021-08-31 Hydro Aluminium Rolled Products Gmbh Method for multiple casting of metal strengths
US20190210099A1 (en) * 2017-10-05 2019-07-11 Emirates Steel Industries PJSC Method for continuous casting of two or more long products using a single continuous casting strand
CN112296295B (en) * 2020-09-11 2021-09-14 柳州钢铁股份有限公司 Method for starting flow again after flow stopping of double-flow slab continuous casting machine in casting

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Also Published As

Publication number Publication date
EP0019114A1 (en) 1980-11-26
CH639575A5 (en) 1983-11-30
JPS55144364A (en) 1980-11-11
CA1151390A (en) 1983-08-09
US4349066A (en) 1982-09-14
DE3062505D1 (en) 1983-05-05
ATE2877T1 (en) 1983-04-15

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