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EP0019114A1 - 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
EP0019114A1
EP0019114A1 EP80102205A EP80102205A EP0019114A1 EP 0019114 A1 EP0019114 A1 EP 0019114A1 EP 80102205 A EP80102205 A EP 80102205A EP 80102205 A EP80102205 A EP 80102205A EP 0019114 A1 EP0019114 A1 EP 0019114A1
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EP
European Patent Office
Prior art keywords
mold
pouring
molds
pull
pouring nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80102205A
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German (de)
French (fr)
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EP0019114B1 (en
Inventor
Markus Schmid
Hans Gloor
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SMS Concast AG
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Concast Holding AG
Concast AG
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Filing date
Publication date
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Priority to AT80102205T priority Critical patent/ATE2877T1/en
Publication of EP0019114A1 publication Critical patent/EP0019114A1/en
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Publication of EP0019114B1 publication Critical patent/EP0019114B1/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 method for 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 to carry out the procedure.
  • each strand is usually assigned its own drive unit, so that it can be driven at an individual strand pull-out speed.
  • drive units with hollow drive rollers have become known (DE-OS 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.
  • 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.
  • 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 in Ab the dependency of the reference inflow quantity flowing into a first mold per unit of time is controlled and the inflow quantity into at least one further mold is regulated depending on 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 is electrically connected to a control 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 control devices for the inflow amount.
  • the pouring nozzle for the first mold could, for example, also be provided with a closure or throttle device.
  • a feature of the invention is e j - but particularly advantageous if the inflowing into the first mold reference inflow amount is substantially defined by the shape and dimension of a sealless Ausgussdüsenö réelle.
  • a certain control of the steel supply amount can, if required, wipe vascular achieved by selection of the bath level in Z.
  • Such an arrangement allows a substantial reduction in the number of closure and control elements. In the event of malfunctions, there is the possibility of diverting the steel jet with an overflow channel and in emergencies the pouring nozzle can be closed by freezing it with a copper plug.
  • 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 respective B adspiegelmess worn 6, provided 6 ', which are shown as optical measuring systems in this example.
  • 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 it 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 amount 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 assumes that the two strands 9, 9 'at the same speed, i.e. 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 as a function of 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 advantageous chosen about 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.
  • 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, in order to enable a 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.
  • 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.

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

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 method for 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 to carry out 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-OS 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 multi-strand systems, each strand is usually assigned its own drive unit, so that it 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-OS 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-AS 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, die ihrerseits mit Verschlussorganen ausgerüstet sind. 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-AS 1 254 828) to subdivide 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 to arrange the intermediate vessel accordingly Neten floor pouring nozzles is provided, which in turn are equipped with closure members. 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, as a rule, 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.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.

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 mini- - mal 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 in eine erste Kokille einfliessende Referenzzuflussmenge gesteuert und die Zuflussmenge in mindestens eine weitere Kokille 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 in Ab the dependency of the reference inflow quantity flowing into a first mold per unit of time is controlled and the inflow quantity into at least one further mold is regulated depending on 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 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 is electrically connected to a control 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 control devices for the inflow amount.

Die Ausgussdüse für die erste Kokille könnte beispielsweise noch mit einer Verschluss- oder einer Drosseleinrichung versehen sein. Nach einem Merkmal der Erfindung ist es je- doch besonders vorteilhaft, wenn die in die erste Kokille einfliessende Referenzzuflussmenge im wesentlichen durch Form und Abmessung einer verschlusslosen Ausgussdüsenöffnung festgelegt wird. Bei Anwendung dieses Verfahrensschrittes kann als Ausgussdüse für die Referenzzuflussmenge eine offene Ausgussdüse ohne Regeleinrichtung verwendet werden. Eine gewisse Regelung der Stahlzufuhrmenge 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.The pouring nozzle for the first mold could, for example, also be provided with a closure or throttle device. According to a feature of the invention is e j - but particularly advantageous if the inflowing into the first mold reference inflow amount is substantially defined by the shape and dimension of a sealless Ausgussdüsenöffnung. When using this process step can be used as a pouring nozzle for the reference inflow quantity of an open pouring nozzle without a control device. A certain control of the steel supply amount can, if required, wipe vascular achieved by selection of the bath level in Z. Such an arrangement allows a substantial reduction in the number of closure and control elements. In the event of malfunctions, there is the possibility of diverting the steel jet with an overflow channel and in emergencies the pouring nozzle can be closed by freezing it with a copper plug.

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 thereby 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:

  • Fig. 1 eine schematisch dargestellte Seitenansicht einer Stranggiessanlage,
  • Fig. 2 einen Schnitt durch eine Ausgussdüse mit elek- troillagnetischer Regeleinheit und
  • Fig. 3 einen Schnitt durch eine Ausgussdüse mit Gaszu- führeinrichtung als Regeleinheit.
The invention is illustrated by the examples described below. Show:
  • 1 is a schematically illustrated side view of a continuous caster,
  • Fig. 2 shows a section through a casting nozzle with elec- troi l lagnetischer control unit and
  • F ig. 3 a section through a casting nozzle with G aszu- transfer means 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.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 respective B adspiegelmesseinrichtung 6, provided 6 ', which are shown as optical measuring systems in this example.

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'.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 it 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 amount 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 assumes that the two strands 9, 9 'at the same speed, i.e. 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 as a function of 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 advantageous chosen about 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. By means of 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, in order to enable a 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. Through the injected inert gas, the Zu flow flow in the inlet funnel to reduce the flow rate.

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 (10)

1. Verfahren zum Stranggiessen von mehreren Strängen, wobei aus mindestens einem Zwischengefäss (1) Stahl in Kokillen (3,3') gegossen wird, die sich bildenden Stränge (9,9') mit gleicher Geschwindigkeit aus den Kokillen (3,3') ausgezogen, gekühlt und die Badspiegel in den Kokillen (3,3') auf gewünschten Höhen gehalten werden, dadurch gekennzeichnet, dass die Ausziehgeschwindigkeit in Abhängigkeit der pro Zeiteinheit in eine erste Kokille (3) einfliessenden Referenzzuflussmenge gesteuert und die Zuflussmenge in mindestens eine weitere Kokille (3') in Abhängigkeit von dieser Ausziehgeschwindigkeit reguliert wird.1. Method for the continuous casting of several strands, steel being poured into molds (3,3 ') from at least one intermediate vessel (1), the strands (9,9') that form at the same speed from the molds (3,3 ') ) pulled out, cooled and the bath levels in the molds (3,3 ') are kept at the desired heights, characterized in that the pull-out speed is controlled depending on the reference inflow quantity flowing into a first mold (3) per unit time and the inflow quantity in at least one further one The mold (3 ') is regulated as a function of this pull-out speed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die in die erste Kokille (3) einfliessende Referenzzuflussmenge im wesentlichen durch Form und Abmessung einer verschlusslosen Ausgussdüsenöffnung festgelegt wird.2. The method according to claim 1, characterized in that the reference inflow quantity flowing into the first mold (3) is determined essentially by the shape and dimension of a closure-free pouring nozzle opening. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der sich in der Ausgussdüse (2') des Zwischengefässes (1) bildende Giessstrahl für die weitere - Kokille (3') durch einschnürende elektromagnetische Felder beaufschlagt wird.3. The method according to claim 1 or 2, characterized in that the pouring jet forming in the pouring nozzle (2 ') of the intermediate vessel (1) for the further mold (3') is acted upon by constricting electromagnetic fields. 4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der sich in der Ausgussdüse (2') des Zwischengefässes (1) bildende Giessstrahl für die weitere Kokille (3') durch einströmende Gase geregelt wird.4. The method according to claim 1 or 2, characterized in that the pouring jet forming in the pouring nozzle (2 ') of the intermediate vessel (1) for the further mold (3') is regulated by inflowing gases. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die erste (3) und die weitere Kokille (3') im Gleichschritt oszilliert werden.5. The method according to any one of claims 1 to 4, characterized in that the first (3) and the further mold (3 ') are oscillated in step. 6. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, wobei mindestens ein Zwischengefäss (1) mit mindestens zwei Ausgussdüsen (2,2') oberhalb von mindestens zwei mit Badspiegelmesseinrichtungen (6,6') versehenen Kokillen (3,3') angeordnet und den Kokillen (3,3') eine Sekundärkühleinrichtung (8) sowie ein Ausziehaggregat (10) nachgeordnet sind, dadurch gekennzeichnet, dass die Badspiegelmesseinrichtung (6) der ersten Kokille (3) mit einer Steuerung (11) für die Geschwindigkeit des gemeinsamen Ausziehaggregates (10) elektrisch verbunden ist und dass die Badspiegelmesseinrichtung (6') der weiteren Kokille (3') mit Regeleinrichtungen für die Zuflussmenge elektrisch verbunden ist.6. Device for carrying out the method according to one of claims 1 to 5, wherein at least one intermediate vessel (1) with at least two pouring nozzles (2,2 ') above at least two molds (6,6') provided with bath level measuring devices (6,6 ') ') and the molds (3,3') are followed by a secondary cooling device (8) and a pull-out unit (10), characterized in that the bath level measuring device (6) of the first mold (3) with a controller (11) for the speed of the common pull-out unit (10) is electrically connected and that the bath level measuring device (6 ') of the further mold (3') is electrically connected to control devices for the inflow quantity. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Regeleinrichtungen für die Zuflussmenge aus den Giessstrahl umfassende elektromagnetischen Spulen (15,21) bestehen.7. The device according to claim 6, characterized in that the control devices for the inflow amount consist of electromagnetic coils (15, 21) comprising the pouring jet. 8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Regeleinrichtungen für die Zuflussmenge aus einer in die Ausgussdüse einmündenden Gaszuführeinrichtung (32) und aus einer Steuerung (33) für die Gasmenge bestehen.8. The device according to claim 6, characterized in that the control devices for the inflow amount consist of a gas supply device (32) opening into the pouring nozzle and from a controller (33) for the gas amount. 9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass der Durchflussquerschnitt der Ausgussdüse (2) für die Referenzzuflussmenge in die erste Kokille (3) etwa 10% kleiner ist als die Durchflussquerschnitte der Ausgussdüsen (2', 31) für die weitere Kokille (3').9. Device according to one of claims 6 to 8, characterized in that the flow cross section of the pouring nozzle (2) for the reference inflow quantity into the first mold (3) is approximately 10% smaller than the flow cross sections of the pouring nozzles (2 ', 31) for the another mold (3 '). 10. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die erste (3) und die weitere Ko-kille (3') in einem gemeinsamen Kokillenrahmen (4) angeordnet sind und dieser Rahmen (4) mit einer Oszillationseinrichtung (17) verbunden ist.10. Device according to one of claims 6 to 9, characterized in that the first (3) and the further K o-kille (3 ') are arranged in a common mold frame (4) and this frame (4) with an oscillation device ( 17) is connected.
EP80102205A 1979-04-27 1980-04-24 Method and apparatus for the continuous casting of several strands Expired EP0019114B1 (en)

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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
CH397579A CH639575A5 (en) 1979-04-27 1979-04-27 METHOD AND DEVICE FOR CONTINUOUSLY MOLDING SEVERAL STRINGS.
CH3975/79 1979-04-27

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EP0019114A1 true EP0019114A1 (en) 1980-11-26
EP0019114B1 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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EP0123138A1 (en) * 1983-03-29 1984-10-31 Metacon AG Method of and installation for controlling a continuous casting plant
EP0128280A1 (en) * 1983-05-13 1984-12-19 RUSS-Elektroofen Produktions- Gesellschaft mbH & Co. KG Low-pressure casting method and device for carrying out the method
FR2569588A1 (en) * 1984-09-05 1986-03-07 Metacon Ag METHOD FOR CONTINUOUS METAL CASTING IN MULTIPLE LINES, AND DEVICE FOR IMPLEMENTING THE SAME
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
EP0223078A1 (en) * 1985-10-26 1987-05-27 Metacon AG Method of starting a multi-strand continuous-casting installation
CN109789477A (en) * 2016-09-27 2019-05-21 海德鲁铝业钢材有限公司 Method for multiple casting metals strand
CN112296295A (en) * 2020-09-11 2021-02-02 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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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
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

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EP0123138A1 (en) * 1983-03-29 1984-10-31 Metacon AG Method of and installation for controlling a continuous casting plant
EP0128280A1 (en) * 1983-05-13 1984-12-19 RUSS-Elektroofen Produktions- Gesellschaft mbH & Co. KG Low-pressure casting method and device for carrying out the method
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
FR2569588A1 (en) * 1984-09-05 1986-03-07 Metacon Ag METHOD FOR CONTINUOUS METAL CASTING IN MULTIPLE LINES, AND DEVICE FOR IMPLEMENTING THE SAME
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EP0223078A1 (en) * 1985-10-26 1987-05-27 Metacon AG Method of starting a multi-strand continuous-casting installation
CN109789477A (en) * 2016-09-27 2019-05-21 海德鲁铝业钢材有限公司 Method for multiple casting metals strand
CN112296295A (en) * 2020-09-11 2021-02-02 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
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

Also Published As

Publication number Publication date
CA1151390A (en) 1983-08-09
US4349066A (en) 1982-09-14
DE3062505D1 (en) 1983-05-05
ATE2877T1 (en) 1983-04-15
EP0019114B1 (en) 1983-03-30
CH639575A5 (en) 1983-11-30
JPS55144364A (en) 1980-11-11

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