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EP0223078A1 - Method of starting a multi-strand continuous-casting installation - Google Patents

Method of starting a multi-strand continuous-casting installation Download PDF

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Publication number
EP0223078A1
EP0223078A1 EP86114413A EP86114413A EP0223078A1 EP 0223078 A1 EP0223078 A1 EP 0223078A1 EP 86114413 A EP86114413 A EP 86114413A EP 86114413 A EP86114413 A EP 86114413A EP 0223078 A1 EP0223078 A1 EP 0223078A1
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EP
European Patent Office
Prior art keywords
level
signal level
closures
pouring
actual
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
EP86114413A
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German (de)
French (fr)
Other versions
EP0223078B1 (en
Inventor
Bernhard Dipl.-Ing. Tinnes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metacon AG
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Metacon AG
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Priority to AT86114413T priority Critical patent/ATE41340T1/en
Publication of EP0223078A1 publication Critical patent/EP0223078A1/en
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Publication of EP0223078B1 publication Critical patent/EP0223078B1/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
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • 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
    • 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
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process

Definitions

  • the invention relates to a method for starting up a continuous casting plant with several strands, in particular for pouring steel melt from an intermediate vessel, into several continuous casting molds by means of adjustable pouring closures, a target fill level of the melt being within a measuring distance, and the strands which are formed by a strand withdrawal unit be subtracted at the same speed.
  • the present invention is a further development of a casting process which is controlled within a fill level measuring section of molds by means of two signal levels via pouring closures with a constant take-off speed.
  • the object on which the invention is based is essentially to be seen in streamlining the casting by shortening the casting time using simplified process steps.
  • the strand extraction unit is switched on after reaching a lower signal level within the measuring section by the actual filling levels of all molds or by the actual filling level first reaching an upper signal level lying within the measuring section and each actual filling level starting from the lower signal level along a predetermined ascent curve into the target level.
  • the actual fill level of each mold can be quickly and separately transferred to the normal inflow control of the target fill level, when the strand withdrawal unit is appropriately switched on in a filling level section of the mold between the lower and the upper signal level of the measuring section, which guarantees the withdrawal safety of the strands.
  • the trigger drive reacts accordingly to what happens first when the actual fill levels rise in the molds. Either it switches on when the lower actual level is exceeded by the last actual level or, if this is not the case, as soon as the first actual level has reached the upper signal level. After the trigger drive has been switched on, the pouring closures automatically close those molds whose actual fill level is still below the lower signal level.
  • the latter is also used for pouring with initially only up to 50% opened spout closures, of which the spout closures that are most distant from the filling point of the intermediate vessel or belong to the outer molds are throttled less than those of the inner molds. This effectively takes into account the lower melt temperatures prevailing in the outer districts of a continuous caster or an intermediate vessel.
  • molten steel is fed to an intermediate vessel 3 via a controllable pouring closure 2, which in turn has three pouring closures 4 in the form of slide closures, which regulate the inflow of the melt through pouring tubes 5 into continuous casting molds A, B, C.
  • each pouring closure 4 is mechanically coupled to an actuator 6, the respective operating position of which is held by a position meter 7.
  • the pouring tubes 5 protrude with their free ends into the molds A, B, C, whose set level 8 set for normal operation lies within a measuring section 9 of a mold level A, B, C assigned to each mold, consisting of transmitter 10 and receiver 11.
  • Downstream of the molds A, B, C is a secondary cooling device, which is not shown for the sake of simplicity, and a strand take-off unit common to the cold strands 18, which has drive rollers 12, a take-off drive 13, a drive controller 14 and a take-off speed meter 15.
  • the latter transmits its measured values to the drive controller 14 and to a processor 16 which also receives and processes the measured values of the position meter 7 which controls the degree of opening of the pouring closures 4 and the receiver 11 of the fill level measuring devices 10, 11.
  • the data obtained go to a control computer 17 integrated in the processor 16, which gives corresponding control commands to the actuators 6 of the pouring closures 4 and to the drive controller 14 of the strand withdrawal unit 12 to 15.
  • the take-off speed is fixed as a constant, ie the cold strands 18 formed in the molds A, B, C are formed by the common strand take-off unit 12 to 15 subtracted constant speed, which means that the target level 8 intended for the molds A, B, C is regulated solely from the inflow side by means of the pouring closures 4.
  • the pouring closures 4 are held in the normal pouring mode at the desired fill level 8 in a throttle position, which enables both opening and closing.
  • the measuring section 9 is equipped with a lower signal level 21 and an upper signal level 22 which are used to control the pouring closures 4 and the trigger drive 13 serve.
  • the casting begins with the opening of the pouring closures 4, so that actual fill levels 20 form in the molds A, B, C above the cold strand heads 19, but these are rarely at the same level.
  • the pouring closures 4 are initially only partially, preferably about 35%, but not fully opened during the pouring. This results in 4 control reserves for the pouring closures both in the closing and in the opening direction, which allow each actual filling level 20 rising in the molds A, B, C (cf. FIG. 2) from the lower signal level 21 to the desired filling level 8 to let it ascend along a predetermined ascent curve 40, which is adapted to the operating conditions of the respective system by appropriate programming of the processor 16.
  • the criterion of the ascending curve 40 which determines the filling speed of the molds A, B, C during casting, is never to be so flat that the freezing limit of the molten steel in the pouring closures 4 has fallen below, and not to be as steep as that the upper slosh limit on Mold edge is exceeded.
  • the regulation of each pouring closure 4 according to the ascent curve 40 begins, as mentioned, at the lower signal level 21 and is triggered by the actual fill level 20 ascending in the corresponding molds A, B, C. If the last of all the actual filling levels A20, B20 or C20 exceeds the lower signal level 21, then the control computer 17 of the processor 16 switches on the trigger drive 13 of the common trigger unit 13 to 15 for the cold strands 18.
  • the actual levels A20, B20, C20 continue to rise independently of one another on the basis of the same criteria and consequently graphically parallel ascent curves 40 until they settle into the nominal level 8 set for normal casting operation If the actual fill level is 20, it would spill over the mold edge. If an actual filling level 20 of a mold A, B or C has already arrived at the upper signal level 22 while casting, while others are still below the lower signal level 21, 20 closing commands are issued for the pouring closures 4 of the actual filling levels remaining in the said manner.
  • the graph of FIG. 2 applies to the actual fill levels 20 shown in FIG. 1.
  • the actual fill level 20 of the mold C reached the lower signal level 21 in the time Ct after the simultaneous throttled opening of all pouring closures 4, the one for the Mold C responsible pouring spout 4 takes over the regulation of the melt inlet according to the designed ascent curve 40.
  • the actual fill levels 20 of the molds B and A successively pass the signal level 21 in the times Bt and At and effect the regulation there according to the ascending curve 40. None of the actual fill levels 20 has remained significantly.
  • the actual fill Stand A20 reaches the lower signal level 21 before the actual fill level C20 has caught up with the upper signal level 22, so that the start command for the trigger drive 13 originates from the actual fill level A20.

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

Abstract

1. A method for starting up a continuous casting system comprising a plurality of castings, especially for pouring molten steel from an intermediate vessel (3) into a plurality of continuous casting moulds (A, B, C) by means of adjustable gate valves (4), with a nominal filling level (8) of the melt being within a measuring zone (9) of a filling level gauge means (9, 10, 11) associated to each mould (A, B, C) and with the resultant castings being withdrawn from a castings withdrawing aggregate (12 through 15) at the same speed, characterized in that switching on of the castings withdrawing aggregate (12 through 15) after reaching a lower signal plane (21) within the measuring zone (9) is effected through the actual filling levels (20) of all moulds (A, B, C) or through the actual filling level (20) first reaching an upper signal level (22) disposed within the measuring zone (9), with the gate valves (4) of the moulds (A, B, C) whose actual filling level is still below the lower signal level (21), in the latter instance, being closed, and that each actual filling level (20), from the lower signal level (21) along a predetermined ascending curve (40) is adjusted into the nominal filling level (8).

Description

Die Erfindung bezieht sich auf ein Verfahren zum Anfahren einer Stranggießanlage mit mehreren Strängen, insbesondere zum Angießen von Stahlschmelze aus einem Zwischengefäß, in mehrere Stranggießkokillen mittels regelbarer Ausgußverschlüsse, wobei ein Sollfüllstand der Schmelze innerhalb einer Meßstrecke liegt, und die sich bildenden Stränge von einem Strangabzugsaggregat mit gleicher Geschwindigkeit abgezogen werden.The invention relates to a method for starting up a continuous casting plant with several strands, in particular for pouring steel melt from an intermediate vessel, into several continuous casting molds by means of adjustable pouring closures, a target fill level of the melt being within a measuring distance, and the strands which are formed by a strand withdrawal unit be subtracted at the same speed.

Es ist bereits vorgeschlagen worden (DE 34 32 611 A1), daß bei am Zwischengefäß zum Angießen geöffneten Ausgußverschlüssen der in jeder Kokille über den Kaltstrangköpfen ansteigende Istfüllstand an einer im unteren Bereich der Meßstrecke liegen den Signalebene die Drosselung seines Ausgußverschlusses zum Egalisieren aller Istfüllstände und danach die Einschaltung des Strangabzugsaggregates bewirkt, die bei ausgebliebener Egalisierung spätestens an einer unterhalb des Sollfüllstandes liegenden, zweiten Signalebene durch den am ersten dort ankommenden Istfüllstand vollzogen wird. Dadurch soll das mit gleicher Abzugsgeschwindigkeit durchgeführte Angießen mit einfachen Verfahrensschritten, insbesondere bezüglich der Betriebssicherheit verbessert werden.It has already been proposed (DE 34 32 611 A1) that when pouring closures are opened at the intermediate vessel for casting on, the actual filling level rising in each mold above the cold strand heads is at a signal level in the lower region of the measuring section, the throttling of its pouring closure for equalizing all actual filling levels and thereafter the activation of the strand take-off unit causes the leveling to take place at a second signal level below the nominal level, if the equalization has failed, by the actual level arriving there at the first. The aim of this is to improve the casting on with the same take-off speed with simple method steps, in particular with regard to operational safety.

Vorliegende Erfindung ist eine Weiterentwicklung eines innerhalb einer Füllstandsmeßstrecke von Kokillen durch zwei Signalebenen über Ausgußverschlüsse bei gleichbleibender Abzugsgeschwindigkeit gesteuerten Angießverfahrens.The present invention is a further development of a casting process which is controlled within a fill level measuring section of molds by means of two signal levels via pouring closures with a constant take-off speed.

Die der Erfindung zugrundeliegende Aufgabe ist im wesentlichen in der Straffung des Angießens durch Verkürzung der Angießzeit mit vereinfachten Verfahrensschritten zu sehen.The object on which the invention is based is essentially to be seen in streamlining the casting by shortening the casting time using simplified process steps.

Zur Lösung der gestellten Aufgabe ist im wesentlichen vorgesehen, daß die Einschaltung des Strangabzugsaggregates nach Erreichen einer innerhalb der Meßstrecke liegenden unteren Signalebene durch die Istfüllstände aller Kokillen oder durch den zuerst zu einer oberen, innerhalb der Meßstrecke liegenden, Signalebene gelangenden Istfüllstand erfolgt und jeder Istfüllstand ab der unteren Signalebene entlang einer vorgegebenen Aufsteigekurve in den Sollfüllstand hineingeregelt wird.To solve the problem, it is essentially provided that the strand extraction unit is switched on after reaching a lower signal level within the measuring section by the actual filling levels of all molds or by the actual filling level first reaching an upper signal level lying within the measuring section and each actual filling level starting from the lower signal level along a predetermined ascent curve into the target level.

Auf diese Weise kann der Istfüllstand jeder Kokille auf separatem Weg zügig in die normale Zuflußregelung des Sollfüllstandes überführt werden, bei zweckvoller Einschaltung des Strangabzugsaggregates in einem die Abzugssicherheit der Stränge gewährleisteten Füllhöhenabschnitt der Kokillen zwischen der unteren und der oberen Signalebene der Meßstrecke. Dementsprechend reagiert der Abzugsantrieb auf das, was beim Aufsteigen der Istfüllstände in den Kokillen zuerst geschieht. Entweder er schaltet ein beim Überschreiten der unteren Signalebene durch den letzten Istfüllstand oder, falls dies nicht zutrifft, sobald der erste Istfüllstand die obere Signalebene erreicht hat. Nach vollzogener Einschaltung des Abzugsantriebes schließen die Ausgußverschlüsse derjenigen Kokillen automatisch, deren Istfüllstand noch unterhalb der unteren Signalebene liegt.In this way, the actual fill level of each mold can be quickly and separately transferred to the normal inflow control of the target fill level, when the strand withdrawal unit is appropriately switched on in a filling level section of the mold between the lower and the upper signal level of the measuring section, which guarantees the withdrawal safety of the strands. The trigger drive reacts accordingly to what happens first when the actual fill levels rise in the molds. Either it switches on when the lower actual level is exceeded by the last actual level or, if this is not the case, as soon as the first actual level has reached the upper signal level. After the trigger drive has been switched on, the pouring closures automatically close those molds whose actual fill level is still below the lower signal level.

Für ein besonders zügiges und dennoch betriebssicheres Angießen wird weiter erfindungsgemäß vorgeschlagen, die an der unteren Signalebene einsetzende Regelung der Ausgußverschlüsse entlang der Aufsteigekurve in einem Bereich über der Einfriergrenze der Schmelze in den Ausgußverschlüssen einerseits und unterhalb der Schwappgrenze der Schmelze am Kokillenrand beim Übergang in die Regelung in den Sollfüllstand andererseits stattfinden zu lassen. Bei einem solchen Vorgehen läuft zum einen der Übergang von einer durch rasche Änderungen des Durchflußquerschnittes an den Ausgußverschlüssen definierten Regelung entlang der Aufsteigekurve in eine dazu verhältnismäßig träge Regelung am Sollfüllstand mit relativ ruhig bleibendem Kokillen-Badspiegel ab, zum anderen wird in den Ausgußverschlüssen auftretenden, den Gießstrahl behindernden Einfrierungen weitgehend entgegengewirkt.For a particularly quick and yet reliable casting on, it is further proposed according to the invention to regulate the pouring closures at the lower signal level along the ascending curve in a region above the freezing limit of the melt in the pouring closures on the one hand and below the slosh limit of the melt at the mold edge during the transition to the regulation to let it take place in the target level on the other hand. With such a procedure, on the one hand, the transition from a regulation defined by rapid changes in the flow cross-section at the pouring closures along the ascending curve to a relatively sluggish regulation at the desired fill level with a relatively constant mold bath level takes place, on the other hand, the one occurring in the pouring closures is the one Freezing hindering pouring jet largely counteracted.

Letzterem dient ferner das Angießen mit zunächst nur bis zu 50 % geöffneten Ausgußverschlüssen, von denen vorteilhaft die von der Füllstelle des Zwischengefäßes entferntesten bzw. zu den äußeren Kokillen gehörenden Ausgußverschlüsse geringer gedrosselt sind als die der inneren Kokillen. Damit ist den in den Außenbezirken einer Stranggießanlage bzw. eines Zwischengefäßes herrschenden niedrigeren Temperaturen der Schmelze wirkungsvoll Rechnung getragen.The latter is also used for pouring with initially only up to 50% opened spout closures, of which the spout closures that are most distant from the filling point of the intermediate vessel or belong to the outer molds are throttled less than those of the inner molds. This effectively takes into account the lower melt temperatures prevailing in the outer districts of a continuous caster or an intermediate vessel.

Zudem besteht die Möglichkeit, die Ausgußverschlüsse beim Angießen nachhinkender Istfüllstände unterhalb der unteren Signalebene, d.h. vor der Regelung längs der Aufsteigekurve, kurzzeitig voll zu öffnen, um Einfrieransätze fortzuspülen.In addition, there is the possibility of the spout closures being poured in after lagging actual fill levels below the lower signal level, i.e. Before the regulation along the ascent curve, briefly open fully to wash away freezing approaches.

Die Erfindung ist nachstehend anhand der Zeichnung erläutert.The invention is explained below with reference to the drawing.

Es zeigen:

  • Fig. 1 schematisch eine Stranggießanlage mit Kokillen in einer Angießposition sowie
  • Fig. 2
  • und 3 mögliche Angießabläufe in graphischer Darstellung.
Show it:
  • Fig. 1 shows schematically a continuous caster with molds in a pouring position and
  • Fig. 2
  • and 3 possible pouring processes in graphical representation.

Aus einer Gießpfanne 1 wird gemäß Fig. 1 über einen regelbaren Ausgußverschluß 2 Stahlschmelze einem Zwischengefäß 3 zugeführt, das seinerseits drei Ausgußverschlüsse 4 in Form von Schieberverschlüssen hat, die den Zufluß der Schmelze durch Gießrohre 5 hindurch in Stranggießkokillen A, B, C regeln. Hierzu ist jeder Ausgußverschluß 4 mit einem Stellglied 6 mechanisch gekoppelt, dessen jeweilige Betriebsposition von einem Stellungsmesser 7 festgehalten wird. Die Gießrohre 5 ragen mit ihren freien Enden in die Kokillen A, B, C hinein, deren für den Normalbetrieb eingestellter Sollfüllstand 8 innerhalb einer Meßstrecke 9 einer jeder Kokille A, B, C zugeordneten, aus Sender 10 und Empfänger 11 bestehenden Füllstandsmeßeinrichtung liegt.From a ladle 1, molten steel is fed to an intermediate vessel 3 via a controllable pouring closure 2, which in turn has three pouring closures 4 in the form of slide closures, which regulate the inflow of the melt through pouring tubes 5 into continuous casting molds A, B, C. For this purpose, each pouring closure 4 is mechanically coupled to an actuator 6, the respective operating position of which is held by a position meter 7. The pouring tubes 5 protrude with their free ends into the molds A, B, C, whose set level 8 set for normal operation lies within a measuring section 9 of a mold level A, B, C assigned to each mold, consisting of transmitter 10 and receiver 11.

Den Kokillen A, B, C nachgeordnet ist eine, der Vereinfachung wegen nicht dargestellte, Sekundärkühleinrichtung sowie ein den Kaltsträngen 18 gemeinsames Strangabzugsaggregat, das Treibrollen 12, einen Abzugsantrieb 13, einen Antriebsregler 14 und einen Abzugsgeschwindigkeitsmesser 15 aufweist. Letzterer gibt seine Meßwerte zum einen an den Antriebsregler 14 und zum anderen an einen Prozessor 16, der außerdem die Meßwerte der den Öffnungsgrad der Ausgußverschlüsse 4 kontrollierenden Stellungsmesser 7 und der Empfänger 11 der Füllstandsmeßeinrichtungen 10, 11 empfängt und verarbeitet. Die erhaltenen Daten gehen an einen im Prozessor 16 integrierten Steuerrechner 17, der entsprechende Steuerbefehle an die Stellglieder 6 der Ausgußverschlüsse 4 und an den Antriebsregler 14 des Strangabzugsaggregates 12 bis 15 gibt. Dort ist die Abzugsgeschwindigkeit als Konstante festgelegt, d.h. die in den Kokillen A, B, C gebildeten Kaltstränge 18 werden durch das gemeinsame Strangabzugsaggregat 12 bis 15 mit gleichbleibender Geschwindigkeit abgezogen, was besagt, daß der für die Kokillen A, B, C vorgesehene Sollfüllstand 8 allein von der Zuflußseite her mittels der Ausgußverschlüsse 4 geregelt wird. Dazu werden die Ausgußverschlüsse 4 im normalen Gießbetrieb auf Sollfüllstand 8 in einer Drosselstellung gehalten, die sowohl ein Auf- als auch ein Zusteuern ermöglicht.Downstream of the molds A, B, C is a secondary cooling device, which is not shown for the sake of simplicity, and a strand take-off unit common to the cold strands 18, which has drive rollers 12, a take-off drive 13, a drive controller 14 and a take-off speed meter 15. The latter transmits its measured values to the drive controller 14 and to a processor 16 which also receives and processes the measured values of the position meter 7 which controls the degree of opening of the pouring closures 4 and the receiver 11 of the fill level measuring devices 10, 11. The data obtained go to a control computer 17 integrated in the processor 16, which gives corresponding control commands to the actuators 6 of the pouring closures 4 and to the drive controller 14 of the strand withdrawal unit 12 to 15. There, the take-off speed is fixed as a constant, ie the cold strands 18 formed in the molds A, B, C are formed by the common strand take-off unit 12 to 15 subtracted constant speed, which means that the target level 8 intended for the molds A, B, C is regulated solely from the inflow side by means of the pouring closures 4. For this purpose, the pouring closures 4 are held in the normal pouring mode at the desired fill level 8 in a throttle position, which enables both opening and closing.

Für das Angießen, wofür die Kaltstränge 18 in die Kokillen A, B, C eingefahren und der Abzugsantrieb 13 abgeschaltet werden, ist die Meßstrecke 9 mit einer unteren Signalebene 21 und einer oberen Signalebene 22 ausgestattet, die zum Steuern der Ausgußverschlüsse 4 und des Abzugsantriebes 13 dienen. Das Gießen beginnt mit dem Auffahren der Ausgußverschlüsse 4, so daß sich über den Kaltstrangköpfen 19 Istfüllstände 20 in den Kokillen A, B, C bilden, die jedoch selten auf gleichem Niveau stehen.For the casting, for which the cold strands 18 are inserted into the molds A, B, C and the trigger drive 13 is switched off, the measuring section 9 is equipped with a lower signal level 21 and an upper signal level 22 which are used to control the pouring closures 4 and the trigger drive 13 serve. The casting begins with the opening of the pouring closures 4, so that actual fill levels 20 form in the molds A, B, C above the cold strand heads 19, but these are rarely at the same level.

Im einzelnen werden beim Angießen zunächst die Ausgußverschlüsse 4 nur teilweise, vorzugsweise zu etwa 35 %, keinesfalls aber voll geöffnet. Dadurch ergeben sich für die Ausgußverschlüsse 4 Regelreserven sowohl in Schließ- als auch in Öffnungsrichtung, die es erlauben, jeden in den Kokillen A, B, C aufsteigenden Istfüllstand 20 (vgl. Fig. 2) von der unteren Signalebene 21 aus bis zum Sollfüllstand 8 entlang einer vorgegebenen Aufsteigekurve 40 aufsteigen zu lassen, die den Betriebsverhältnissen der jeweiligen Anlage durch entsprechende Programmierung des Prozessors 16 angepaßt ist.In detail, the pouring closures 4 are initially only partially, preferably about 35%, but not fully opened during the pouring. This results in 4 control reserves for the pouring closures both in the closing and in the opening direction, which allow each actual filling level 20 rising in the molds A, B, C (cf. FIG. 2) from the lower signal level 21 to the desired filling level 8 to let it ascend along a predetermined ascent curve 40, which is adapted to the operating conditions of the respective system by appropriate programming of the processor 16.

Das Kriterium der Aufsteigekurve 40, welche die Füllgeschwindigkeit der Kokillen A, B, C beim Angießen bestimmt, liegt darin, niemals so flach zu sein, als daß die Einfriergrenze der Stahlschmelze in den Ausgußverschlüssen 4 unterschritten, und nicht so steil zu sein, als daß die obere Schwappgrenze am Kokillenrand überschritten wird. Die Regelung jedes Ausgußverschlusses 4 nach der Aufsteigekurve 40 setzt, wie angeführt, an der unteren Signalebene 21 ein und wird durch den in den korrespondierenden Kokillen A, B, C aufsteigenden Istfüllstand 20 ausgelöst. Überschreitet beim Aufsteigen der letzte aller Istfüllstände A20, B20 oder C20 die untere Signalebene 21, dann schaltet der Steuerrechner 17 des Prozessors 16 den Abzugsantrieb 13 des gemeinsamen Abzugsaggregates 13 bis 15 für die Kaltstränge 18 ein. Danach vollzieht sich der Aufstieg der Istfüllstände A20, B20, C20 unabhängig voneinander weiterhin auf der Basis gleicher Kriterien und folglich graphisch parallelen Aufsteigekurven 40 bis zum Einschwingen in den für den normalen Gießbetrieb eingestellten Sollfüllstand 8. Würde dabei das Einschwingen übermäßige Impulse durch einen zu schnell aufsteigenden Istfüllstand 20 erhalten, wäre ein Überschwappen über den Kokillenrand gegeben. Ist beim Angießen ein Istfüllstand 20 einer Kokille A, B oder C bereits an der oberen Signalebene 22 angekommen, während sich andere noch unterhalb der unteren Signalebene 21 befinden, ergehen für die Ausgußverschlüsse 4 der in besagter Weise zurückgebliebenen Istfüllstände 20 Schließbefehle.The criterion of the ascending curve 40, which determines the filling speed of the molds A, B, C during casting, is never to be so flat that the freezing limit of the molten steel in the pouring closures 4 has fallen below, and not to be as steep as that the upper slosh limit on Mold edge is exceeded. The regulation of each pouring closure 4 according to the ascent curve 40 begins, as mentioned, at the lower signal level 21 and is triggered by the actual fill level 20 ascending in the corresponding molds A, B, C. If the last of all the actual filling levels A20, B20 or C20 exceeds the lower signal level 21, then the control computer 17 of the processor 16 switches on the trigger drive 13 of the common trigger unit 13 to 15 for the cold strands 18. Thereafter, the actual levels A20, B20, C20 continue to rise independently of one another on the basis of the same criteria and consequently graphically parallel ascent curves 40 until they settle into the nominal level 8 set for normal casting operation If the actual fill level is 20, it would spill over the mold edge. If an actual filling level 20 of a mold A, B or C has already arrived at the upper signal level 22 while casting, while others are still below the lower signal level 21, 20 closing commands are issued for the pouring closures 4 of the actual filling levels remaining in the said manner.

Für die in Fig. 1 eingezeichneten Istfüllstände 20 gilt die Graphik nach Fig. 2. Danach hat der Istfüllstand 20 der Kokille C nach gleichzeitigem gedrosseltem Öffnen aller Ausgußverschlüsse 4 zum Angießbeginn als erster in der Zeit Ct die untere Signalebene 21 erreicht, wobei der für die Kokille C zuständige Ausgußverschluß 4 die Regelung des Schmelzzulaufes gemäß der ausgelegten Aufsteigekurve 40 übernimmt. In Folge passieren die Istfüllstände 20 der Kokillen B und A nacheinander in den Zeiten Bt und At die Signalebene 21 und bewirken dort die Regelung gemäß der Aufsteigekurve 40. Keiner der Istfüllstände 20 ist nennenswert zurückgeblieben. Der Istfüllstand A20 erreicht die untere Signalebene 21 noch bevor der Istfüllstand C20 zur oberen Signalebene 22 aufgeschlossen hat, so daß der Startbefehl für den Abzugsantrieb 13 vom Istfüllstand A20 ausgeht.The graph of FIG. 2 applies to the actual fill levels 20 shown in FIG. 1. After that, the actual fill level 20 of the mold C reached the lower signal level 21 in the time Ct after the simultaneous throttled opening of all pouring closures 4, the one for the Mold C responsible pouring spout 4 takes over the regulation of the melt inlet according to the designed ascent curve 40. As a result, the actual fill levels 20 of the molds B and A successively pass the signal level 21 in the times Bt and At and effect the regulation there according to the ascending curve 40. None of the actual fill levels 20 has remained significantly. The actual fill Stand A20 reaches the lower signal level 21 before the actual fill level C20 has caught up with the upper signal level 22, so that the start command for the trigger drive 13 originates from the actual fill level A20.

Anders beim Beispiel nach Fig. 3, wo der Istfüllstand A20 -an der oberen Signalebene 22 angekommen ist und der Istfüllstand B 20 die untere Signalebene 21 überschritten hat, aber unterhalb welcher der Istfüllstand C20 hinterherhinkt. Bei dieser Konstellation der Istfüllstände wird der Abzugsantrieb 13-an der oberen Signalebene 22 vom Istfüllstand A20 gestartet und gleichzeitig der Ausgußverschluß 4 des nicht über die untere Signalebene 21 angestiegenen Istfüllstandes C20 geschlossen.This is different in the example according to FIG. 3, where the actual fill level A20 has arrived at the upper signal level 22 and the actual fill level B 20 has exceeded the lower signal level 21, but below which the actual fill level C20 lags behind. With this constellation of the actual filling levels, the trigger drive 13 is started at the upper signal level 22 from the actual filling level A20 and at the same time the pouring closure 4 of the actual filling level C20 which has not risen above the lower signal level 21 is closed.

Bezugszeichenliste:Reference symbol list:

  • 1 Gießpfanne1 ladle
  • 2 Ausgußverschluß2 pouring spout
  • 3 Zwischengefäß3 intermediate vessel
  • 4 Ausgußverschlüsse4 pouring closures
  • 5 Gießrohre5 pouring tubes
  • 6 Stellglieder6 actuators
  • 7 Stellungsmesser7 position meters
  • 8 Sollfüllstand8 target level
  • 9 Meßstrecke9 measuring section
  • 10 Sender } Füllstandsmeßeinrichtung 11 Empfänger10 transmitters} level measuring device 11 receivers
  • 12 Treibrollen12 driving rollers
  • 13 Abzugsantrieb13 trigger drive
  • 14 Antriebsregler } Strangabzugsaggregat14 Drive controller} Extraction unit
  • 15 Abzugsgeschwindigkeitsmesser15 take-off speedometer
  • 16 Prozessor16 processor
  • 17 Steuerrechner17 control computer
  • 18 Kaltstränge18 cold strands
  • 19 Kaltstrangköpfe19 cold strand heads
  • 20 Istfüllstand20 actual level
  • 21 untere Signalebene21 lower signal level
  • 22 obere Signalebene22 upper signal level
  • 40 Aufsteigekurve40 ascent curve
  • A StranggießkokilleA continuous casting mold
  • B StranggießkokilleB Continuous casting mold
  • C StranggießkokilleC Continuous casting mold

Claims (5)

1. Verfahren zum Anfahren einer Stranggießanlage mit mehreren Strängen, insbesondere zum Angießen von Stahlschmelze aus einem Zwischengefäß (3), in mehrere Stranggießkokillen (A, B, C) mittels regelbarer Ausgußverschlüsse (4), wobei ein Sollfüllstand (8) der Schmelze innerhalb einer Meßstrecke (9) liegt und die sich bildenden Stränge von einem Strangabzugsaggregat (12 bis 15) mit gleicher Geschwindigkeit abgezogen werden, dadurch gekennzeichnet, daß die Einschaltung des Strangabzugsaggregates (12 bis 15) nach Erreichen einer innerhalb der Meßstrecke (9) liegenden unteren Signalebene (21) durch die Istfüllstände (20) aller Kokillen (A, B, C) oder durch den zuerst zu einer oberen innerhalb der Meßstrecke (9) liegenden Signalebene (22) gelangenden Istfüllstand (20) erfolgt und jeder Istfüllstand (20) ab der unteren Signalebene (21) entlang einer vorgegebenen Aufsteigekurve (40) in den Sollfüllstand (8) hineingeregelt wird.1.Method for starting up a continuous caster with several strands, in particular for casting steel melt from an intermediate vessel (3), into several continuous casting molds (A, B, C) by means of adjustable pouring closures (4), with a desired fill level (8) of the melt within one Measuring section (9) lies and the strands that are formed are drawn off from a strand withdrawal unit (12 to 15) at the same speed, characterized in that the activation of the strand withdrawal unit (12 to 15) after reaching a lower signal level (9) lying within the measuring section (9) 21) by the actual fill levels (20) of all molds (A, B, C) or by the actual fill level (20) first reaching an upper signal level (22) within the measuring section (9) and each actual fill level (20) from the lower one Signal level (21) along a predetermined ascent curve (40) into the target level (8). 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die an der unteren Signalebene (21) einsetzende Regelung der Ausgußverschlüsse (4) entlang der Aufsteigekurve (40) in einem Bereich über der Einfriergrenze der Schmelze in den Ausgußverschlüssen (4) einerseits und unterhalb der Schwappgrenze der Schmelze am Kokillenrand beim Übergang in die Regelung in den Sollfüllstand andererseits erfolgt.2. The method according to claim 1, characterized in that the onset of the lower signal level (21) regulation of the pouring closures (4) along the ascending curve (40) in a region above the freezing limit of the melt in the pouring closures (4) on the one hand and below the On the other hand, the smudge limit of the melt at the mold edge occurs when the control system changes to the nominal fill level. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Ausgußverschlüsse (4) zunächst nur bis zu 50 % geöffnet werden, wobei vorzugsweise die zu den äußeren bzw. den von der Füllstelle des Zwischengefäßes (3) entfernter liegenden Kokillen (A und C) gehörenden Ausgußverschlüsse (4) geringer gedrosselt sind als die zu den inneren bzw. den an der Füllstelle des Zwischengefäßes (3) näher liegenden Kokillen (B) gehörenden Ausgußverschlüssen (4).3. The method according to claim 1 or 2, characterized in that the pouring closures (4) are initially only opened up to 50%, preferably the to the outer or from the filling point of the intermediate vessel (3) lying away molds (A and C) belonging spout closures (4) are throttled less than the spout closures (4) belonging to the inner or to the molds (B) located closer to the filling point of the intermediate vessel (3). 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Ausgußverschlüsse (4) beim Angießen nachhinkender Istfüllstände (C20) unterhalb der unteren Signalebene (21), d.h. vor der Regelung längs der Ansteigekurve4. The method according to any one of claims 1 to 3, characterized in that the pouring closures (4) when casting lagging actual levels (C20) below the lower signal level (21), i.e. before the regulation along the rise curve (40), kurzzeitig voll geöffnet werden.(40), be fully opened for a short time.
EP86114413A 1985-10-26 1986-10-17 Method of starting a multi-strand continuous-casting installation Expired EP0223078B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114413T ATE41340T1 (en) 1985-10-26 1986-10-17 PROCEDURE FOR STARTING UP A CONTINUOUS CONTINUOUS CASTING PLANT WITH MULTIPLE STRANDS.

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DE19853538222 DE3538222A1 (en) 1985-10-26 1985-10-26 METHOD FOR STARTING UP A CONTINUOUS CASTING SYSTEM WITH MULTIPLE STRINGS
DE3538222 1985-10-26

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EP0223078A1 true EP0223078A1 (en) 1987-05-27
EP0223078B1 EP0223078B1 (en) 1989-03-15

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EP (1) EP0223078B1 (en)
JP (1) JP2540032B2 (en)
CN (1) CN1008985B (en)
AT (1) ATE41340T1 (en)
CA (1) CA1265912A (en)
CZ (1) CZ281650B6 (en)
DE (2) DE3538222A1 (en)
GR (1) GR3000078T3 (en)
IN (1) IN163970B (en)
MX (1) MX172000B (en)
PL (1) PL154653B3 (en)
SU (1) SU1447270A3 (en)
ZA (1) ZA865223B (en)

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* Cited by examiner, † Cited by third party
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DE3937752A1 (en) * 1988-11-22 1991-05-16 Hitachi Shipbuilding Eng Co Automatically starting continuous casting appts.
FR2677284A1 (en) * 1991-06-07 1992-12-11 Pechiney Aluminium METHOD AND APPARATUS FOR AUTOMATIC CASTING OF SEMI-PRODUCTS
EP0564674A1 (en) * 1992-04-06 1993-10-13 Zimmermann & Jansen GmbH Method of starting a continuous-casting installation
EP0855238A1 (en) * 1997-01-24 1998-07-29 Alusuisse Technology & Management AG Process for vertical continuous casting of metals
EP1172160A1 (en) * 2000-07-11 2002-01-16 SMS Demag AG Process and installation for continuous casting, comprising a device for measuring the molten metal level in the mould, especially for liquid steel
WO2002085557A2 (en) * 2001-04-19 2002-10-31 Alcoa Inc. Continuous pressure molten metal supply system and method for forming continuous metal articles
US7934627B2 (en) 2005-10-13 2011-05-03 Alcoa Inc. Apparatus and method for high pressure extrusion with molten aluminum
EP3231532A1 (en) * 2016-04-12 2017-10-18 Primetals Technologies Austria GmbH Methods of starting and stopping a multi-strand continuous casting machine, and shared sealing drive and multi-strand continuous casting machine

Families Citing this family (8)

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JPS62183952A (en) * 1986-02-07 1987-08-12 Sumitomo Metal Ind Ltd Control method for surface level of molten steel in mold
JPS62183951A (en) * 1986-02-07 1987-08-12 Sumitomo Metal Ind Ltd Control method for surface level of molten steel in mold
GB2249978B (en) * 1990-11-26 1994-08-24 Ishikawajima Harima Heavy Ind Tundish flow control
CN102430728B (en) * 2011-12-07 2013-07-10 中宁县锦宁铝镁新材料有限公司 Multi-crystallizer horizontal continuous casting tundish and continuous casting process implemented by using same
CN103112709B (en) * 2013-03-11 2015-11-04 嘉诺资源再生技术（苏州）有限公司 A kind of online removal device
CN105215305B (en) * 2015-10-14 2017-09-01 中冶连铸技术工程有限责任公司 A kind of three machines three stream sheet billet continuous casting machine production line
CN109789477B (en) * 2016-09-27 2021-10-26 海德鲁铝业钢材有限公司 Method for multiple casting of metal strands
US10913108B2 (en) 2017-09-12 2021-02-09 Wagstaff, Inc. Dynamically positioned diffuser for metal distribution during a casting operation

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EP0019114A1 (en) * 1979-04-27 1980-11-26 Concast Holding Ag Method and apparatus for the continuous casting of several strands
EP0149447A2 (en) * 1983-12-29 1985-07-24 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
GB2163983A (en) * 1984-09-05 1986-03-12 Metacon Ag Method of casting melt into a plurality of continuous casting moulds

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Publication number Priority date Publication date Assignee Title
EP0019114A1 (en) * 1979-04-27 1980-11-26 Concast Holding Ag Method and apparatus for the continuous casting of several strands
EP0149447A2 (en) * 1983-12-29 1985-07-24 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
GB2163983A (en) * 1984-09-05 1986-03-12 Metacon Ag Method of casting melt into a plurality of continuous casting moulds

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937752A1 (en) * 1988-11-22 1991-05-16 Hitachi Shipbuilding Eng Co Automatically starting continuous casting appts.
FR2677284A1 (en) * 1991-06-07 1992-12-11 Pechiney Aluminium METHOD AND APPARATUS FOR AUTOMATIC CASTING OF SEMI-PRODUCTS
EP0564674A1 (en) * 1992-04-06 1993-10-13 Zimmermann & Jansen GmbH Method of starting a continuous-casting installation
EP0855238A1 (en) * 1997-01-24 1998-07-29 Alusuisse Technology & Management AG Process for vertical continuous casting of metals
WO1998032559A1 (en) * 1997-01-24 1998-07-30 Alusuisse Technology & Management Ag Method for vertical continuous casting of metals
AU716841B2 (en) * 1997-01-24 2000-03-09 Alusuisse Technology & Management Ag Method for vertical,continuous casting of metals
EP1172160A1 (en) * 2000-07-11 2002-01-16 SMS Demag AG Process and installation for continuous casting, comprising a device for measuring the molten metal level in the mould, especially for liquid steel
WO2002085557A2 (en) * 2001-04-19 2002-10-31 Alcoa Inc. Continuous pressure molten metal supply system and method for forming continuous metal articles
WO2002085557A3 (en) * 2001-04-19 2003-08-28 Alcoa Inc Continuous pressure molten metal supply system and method for forming continuous metal articles
US6712125B2 (en) 2001-04-19 2004-03-30 Alcoa Inc. Continuous pressure molten metal supply system and method for forming continuous metal articles
US7934627B2 (en) 2005-10-13 2011-05-03 Alcoa Inc. Apparatus and method for high pressure extrusion with molten aluminum
EP3231532A1 (en) * 2016-04-12 2017-10-18 Primetals Technologies Austria GmbH Methods of starting and stopping a multi-strand continuous casting machine, and shared sealing drive and multi-strand continuous casting machine

Also Published As

Publication number Publication date
DE3538222C2 (en) 1989-05-11
ZA865223B (en) 1987-03-25
CA1265912A (en) 1990-02-20
CN86104290A (en) 1987-05-06
JP2540032B2 (en) 1996-10-02
CN1008985B (en) 1990-08-01
SU1447270A3 (en) 1988-12-23
DE3662339D1 (en) 1989-04-20
IN163970B (en) 1988-12-17
EP0223078B1 (en) 1989-03-15
GR3000078T3 (en) 1990-10-31
CZ772186A3 (en) 1996-09-11
PL154653B3 (en) 1991-09-30
DE3538222A1 (en) 1987-05-27
MX172000B (en) 1993-11-29
ATE41340T1 (en) 1989-04-15
JPS62101359A (en) 1987-05-11
CZ281650B6 (en) 1996-12-11

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