EP0542024A1 - Method for continuous casting of molten metal in a continuous casting machine - Google Patents
Method for continuous casting of molten metal in a continuous casting machine Download PDFInfo
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- EP0542024A1 EP0542024A1 EP92118311A EP92118311A EP0542024A1 EP 0542024 A1 EP0542024 A1 EP 0542024A1 EP 92118311 A EP92118311 A EP 92118311A EP 92118311 A EP92118311 A EP 92118311A EP 0542024 A1 EP0542024 A1 EP 0542024A1
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- mold
- strand
- wall
- casting
- elongation
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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
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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
Definitions
- liquid steel is poured from a distributor into a water-cooled mold, usually a copper mold.
- a water-cooled mold usually a copper mold.
- the mold is moved in the strand pulling direction at a frequency of about 1 to 3 Hertz.
- a lubricating film is normally maintained between the steel and the inside of the mold wall. Due to the cooling of the steel through the mold walls, a steel strand with solidified strand shells and a still liquid core is formed.
- the steel strand which has been partially solidified in this way is pulled out of the mold by means of suitable pull-out means, it being supported and guided by rollers arranged below the mold.
- the invention is based on a method for casting metals in a continuous casting installation, the strand being continuously withdrawn from the mold and the casting process being controlled as a function of the stresses which occur in the continuous casting installation when the strand is extracted.
- the object of the invention is to provide measures in such a method with which breaks in the strand can be avoided in a simple manner.
- the solution to this problem in the aforementioned method is that during the continuous strand withdrawal, the expansion of the inner wall of the mold caused by the occurrence of mechanical forces in the strand withdrawal direction is measured, and the measurement values obtained are used to control the casting process in such a way that when exceeded the casting speed is reduced or the casting process is interrupted.
- the method according to the invention is based on the knowledge that, in the event of pull-out forces acting on the strand, in the event of caking (adhesive), there is a short-term expansion of the mold wall which is in the elastic range.
- This short-term expansion which is overlaid by the general thermal expansion of the mold wall, is an excellent signal for the occurrence of a breakthrough in the mold.
- this signal is generated without a time delay, so that the Measures of reducing the casting speed or even stopping the casting process can be taken early enough to prevent the liquid metal from flowing out.
- the method according to the invention can also be used to distinguish between light and heavy caking.
- slight caking it is sufficient if the casting speed is reduced in such a way that the remaining time in the mold is sufficient to allow a new, stable and solidified strand shell to be formed at the breakthrough point due to the continuous cooling. Then the casting speed can be increased slowly and continuously.
- heavy caking on the other hand, the casting process must be interrupted immediately, because with such caking the time remaining in the mold is not sufficient to heal the breakthrough.
- the strain measurement can in principle be carried out at any point on each mold wall. However, it has turned out that it is beneficial not to close to the corners of the mold, because there the stretch of the mold wall is the least due to the great rigidity of the construction. It is therefore advantageous if the points lie in the middle area of the mold walls. You should get at least one from the corners of the mold
- One third of the width of the side wall in question preferably should be in the middle of the walls.
- the strain measurement is carried out directly on the strand-side parts of the mold walls by means of suitable sensors, in particular strain gauges, this means a not inconsiderable effort, in particular because of the supply lines to the sensors and lines arranged in the interior of the water tank.
- the strain measurement is carried out on the outer wall of the water box remote from the strand when the water box forms a rigid unit with the mold inner wall.
- strain gauges 2a, 2b On the back of the broad side wall 1 shown in FIG. 1 there are two strain gauges 2a, 2b in the center, one of which is a strain gauge 2a in the strand pull-out direction and the other strain gauge 2b is arranged transversely thereto.
- These strain gauges 2a, 2b form a bridge circuit with two resistors R3, R4, in the diagonal of which an amplifier 3 is arranged, which supplies an output signal.
- the bridge circuit fed by a voltage source 4 is designed such that the amplifier 3 delivers no or a small output signal if the resistance values of the strain gauges 2a, 2b are the same. This is always the case if, due to the lack of caking on the mold wall and effective extraction forces, only thermal expansion occurs.
- the bridge circuit is detuned by the fact that the resistance value for the strain gauge 2a increases.
- the amplifier 3 delivers a suddenly increasing output signal, as is shown in the expansion time diagram of FIG. 3 for the time between 140 and 150 seconds. This suddenly rising output signal is evaluated in an evaluation circuit. Depending on this evaluation, the casting process is either slowed down or interrupted.
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Abstract
Description
Beim Gießen in einer Stranggießanlage wird flüssiger Stahl aus einem Verteiler in eine wassergekühlte Kokille, zumeist eine Kupferkokille, gegossen. Während des kontinuierlichen Auszuges des Stranges aus der Kokille wird die Kokille mit einer Frequenz von etwa 1 bis 3 Hertz in Strangauszugsrichtung bewegt. Zwischen dem Stahl und der Innenseite der Kokillenwand wird im Normalfall ein Schmierfilm aufrechterhalten. Aufgrund der Kühlung des Stahls durch die Kokillenwände bildet sich ein Stahlstrang mit erstarrten Strangschalen und noch flüssigem Kern. Der so teilerstarrte Stahlstrang wird mittels geeigneter Auszugmittel aus der Kokille herausgezogen, wobei er von unterhalb der Kokille angeordneten Rollen gestützt und geführt wird.When casting in a continuous caster, liquid steel is poured from a distributor into a water-cooled mold, usually a copper mold. During the continuous pulling out of the strand from the mold, the mold is moved in the strand pulling direction at a frequency of about 1 to 3 Hertz. A lubricating film is normally maintained between the steel and the inside of the mold wall. Due to the cooling of the steel through the mold walls, a steel strand with solidified strand shells and a still liquid core is formed. The steel strand which has been partially solidified in this way is pulled out of the mold by means of suitable pull-out means, it being supported and guided by rollers arranged below the mold.
Im praktischen Betrieb einer solchen Stranggießanlage treten von Zeit zu Zeit nicht vorhersehbare Betriebsstörungen auf, die gelegentlich Durchbrüche von flüssigem Stahl durch die erstarrte Strangschale zur Folge haben. Solche Durchbrüche führt man auf Anbackungen (Klebern) zwischen dem Stahl und der gekühlten Kokillenwand zurück. Wegen der auf den teilerstarrten Strang einwirkenden Auszugskräfte wird die Strangschale im Bereich der Anbackungen aufgerissen. Wenn dann diese Stelle nicht vor Verlassen der Kokille durch Kühlung wieder genügend Festigkeit erhält, bricht der flüssige Stahl durch und fließt in die Anlage. Dadurch werden die unterhalb der Kokille angeordneten Anlageteile, wie Stütz- und Führungsrollen, Stützkonstruktionen häufig in einem solchen Maße beschädigt, daß diese Anlagenteile nicht mehr brauchbar sind und durch neue Teile ersetzt werden müssen. Das bedeutet längere, manchmal tagelange Stillstandszeit der Anlage und damit Produktionsausfall. Deshalb sind die Betreiber von Stranggießanlagen bemüht, die Durchbrüche möglichst zu vermeiden.In practical operation of such a continuous caster, from time to time unforeseeable malfunctions occur, which occasionally result in liquid steel breaking through the solidified continuous shell. Such breakthroughs are attributed to caking (glue) between the steel and the cooled mold wall. Because of the pulling forces acting on the partially solidified strand, the strand shell is torn open in the area of the caking. If If this point is not given sufficient strength by cooling before leaving the mold, the molten steel breaks through and flows into the system. As a result, the plant parts arranged below the mold, such as support and guide rollers, support structures are often damaged to such an extent that these plant parts are no longer usable and have to be replaced by new parts. This means a longer, sometimes days-long downtime of the system and thus loss of production. Therefore, the operators of continuous casting plants endeavor to avoid breakthroughs as far as possible.
So ist bereits zur Vermeidung von Durchbrüchen vorgeschlagen worden, an den ersten Segmenten einer sich an die Kokille anschließenden Strangführung die Kraftänderungen der Ausziehkräfte zu messen und für die Steuerung des Gießprozesses heranzuziehen. Bei Überschreiten vorgegebener Grenzwerte wird der Gießprozeß verlangsamt oder sogar unterbrochen (DE-PS 29 23 900).To avoid breakthroughs, it has already been proposed to measure the force changes in the pull-out forces on the first segments of a strand guide adjoining the mold and to use them to control the casting process. If the predetermined limit values are exceeded, the casting process is slowed down or even interrupted (DE-PS 29 23 900).
Ferner ist es bekannt (DE-PS 25 01 868), während des Gießprozesses die Verteilung der Wärmestromdichte an der Kokillenwand zu überwachen. Die Wärmestromdichte wird mittelbar durch Messung der Dehnung der formgebenden Kokillenwand an mehreren Abschnitten ermittelt. Die dabei gewonnenen Signale werden miteinander verknüpft, um in Abhängigkeit davon die Strangauszuggeschwindigkeit und die Stahlzufuhr zur Kokille zu steuern. Bei diesem Verfahren geht es also nicht um die Erkennung von Durchbrüchen vorausgehenden Anbackungen, sondern um die Ermittelung der Verteilung der Wärmestromdichte über die Kokillenhöhe, um in Abhängigkeit davon den Gießprozeß steuern zu können.Furthermore, it is known (DE-PS 25 01 868) to monitor the distribution of the heat flow density on the mold wall during the casting process. The heat flow density is determined indirectly by measuring the elongation of the mold wall at several sections. The signals obtained are linked to one another in order to control the strand pull-out speed and the steel feed to the mold. This method is therefore not about the detection of breakthroughs prior to breakthroughs, but rather about the determination of the distribution of the heat flow density over the mold height in order to be able to control the casting process as a function thereof.
Bei einem anderen bekannten Verfahren (EP-A3 0 389 139) wird der Wärmefluß in verschiedenen Höhen der Kokille ermittelt und der Abstand des Bereichs des höchsten Wärmeflusses von dem Schmelzbadspiegel als Kriterium für die Prüfung herangezogen, ob sich ein Durchbruch anbahnt.In another known method (EP-A3 0 389 139), the heat flow is determined at different heights of the mold and the distance of the area of the highest heat flow from the melt pool level is used as a criterion for checking whether a breakthrough is in the offing.
Die Erfindung geht von einem Verfahren zum Gießen von Metallen in einer Strangußanlage aus, wobei der Strang kontinuierlich aus der Kokille ausgezogen und der Gießprozeß in Abhängigkeit von beim Ausziehen des Stranges in der Stranggußanlage auftretender Spannungen gesteuert wird.The invention is based on a method for casting metals in a continuous casting installation, the strand being continuously withdrawn from the mold and the casting process being controlled as a function of the stresses which occur in the continuous casting installation when the strand is extracted.
Aufgabe der Erfindung ist es, bei einem solchen Verfahren Maßnahmen vorzusehen, mit denen in einfacher Weise Durchbrüche des Stranges vermieden werden können.The object of the invention is to provide measures in such a method with which breaks in the strand can be avoided in a simple manner.
Die Lösung dieser Aufgabe bei dem vorgenannten Verfahren besteht darin, daß während des kontinuierlichen Strangabzuges die durch das Auftreten mechanischer Kräfte in Strangabzugsrichtung verursachte Dehnung der Innenwand der Kokille gemessen wird und die dabei anfallenden Meßwerte für die Steuerung des Gießprozesses verwendet werden, derart, daß beim Überschreiten vorgegebener Grenzwerte die Gießgeschwindigkeit verringert oder der Gießprozeß unterbrochen wird.The solution to this problem in the aforementioned method is that during the continuous strand withdrawal, the expansion of the inner wall of the mold caused by the occurrence of mechanical forces in the strand withdrawal direction is measured, and the measurement values obtained are used to control the casting process in such a way that when exceeded the casting speed is reduced or the casting process is interrupted.
Dem erfindungsgemäßen Verfahren liegt die Erkenntnis zugrunde, daß bei auf den Strang einwirkenden Ausziehkräften im Falle einer Anbackung (Kleber) eine kurzfristige, im elastischen Bereich liegende Dehnung der Kokillenwand auftritt. Diese kurzfristige Dehnung, die von der allgemeinen Wärmedehnung der Kokillenwand überlagert wird, ist ein vortreffliches Signal für das Entstehen eines Durchbruchs in der Kokille. Dieses Signal wird im Gegensatz zu Signalen, die von Temperaturänderungen der Kokillenwand abgeleitet sind, ohne Zeitverzögerung erzeugt, so daß die Maßnahmen der Verminderung der Gießgeschwindigkeit oder sogar eines Stopps des Gießprozesses frühzeitig genug getroffen werden können, um ein Ausfließen des flüssigen Metalls zu verhindern.The method according to the invention is based on the knowledge that, in the event of pull-out forces acting on the strand, in the event of caking (adhesive), there is a short-term expansion of the mold wall which is in the elastic range. This short-term expansion, which is overlaid by the general thermal expansion of the mold wall, is an excellent signal for the occurrence of a breakthrough in the mold. In contrast to signals which are derived from changes in temperature of the mold wall, this signal is generated without a time delay, so that the Measures of reducing the casting speed or even stopping the casting process can be taken early enough to prevent the liquid metal from flowing out.
Mit dem erfindungsgemäßen Verfahren kann auch zwischen leichten und schweren Anbackungen unterschieden werden. Bei leichten Anbackungen reicht es aus, wenn die Gießgeschwindigkeit derart vermindert wird, daß die verbleibende Zeit in der Kokille ausreicht, um an der Durchbruchsstelle durch die andauernde Kühlung eine neue stabile und erstarrte Strangschale entstehen zu lassen. Danach kann dann wieder langsam und kontinuierlich die Gießgeschwindigkeit erhöht werden. Bei schweren Anbackungen dagegen muß der Gießprozeß sofort unterbrochen werden, weil bei solchen Anbackungen die verbleibende Zeit in der Kokille nicht ausreicht, den Durchbruch zu heilen. Wann eine Anbackung als leicht oder schwer zu werten ist, hängt von der jeweiligen Kokille ab, das heißt, daß kokillenbezogene Grenzwerte für den Vergleich mit den gemessenen Signalen für die Dehnung vorgegeben werden. Dieser Vergleich läßt sich mit absoluten Werten vornehmen. Es ist allerdings auch möglich, den zuletzt erfaßten Meßwert mit einem folgenden Meßwert zu vergleichen, so daß man zur Messung des Gradienten kommt und der Gradient ein Maß für einen sich anbahnenden Durchbruch ist. Da bei einer Anbackung der auf dieser Anbackung basierende Wert im Vergleich zu einem auf Wärmedehnung basierenden Wert sehr schnell ansteigt, wird er nicht durch den Anteil aus der Wärmedehnung verfälscht.The method according to the invention can also be used to distinguish between light and heavy caking. In the case of slight caking, it is sufficient if the casting speed is reduced in such a way that the remaining time in the mold is sufficient to allow a new, stable and solidified strand shell to be formed at the breakthrough point due to the continuous cooling. Then the casting speed can be increased slowly and continuously. In the case of heavy caking, on the other hand, the casting process must be interrupted immediately, because with such caking the time remaining in the mold is not sufficient to heal the breakthrough. When caking is to be rated as easy or difficult depends on the respective mold, which means that mold-related limit values are specified for the comparison with the measured signals for the elongation. This comparison can be made with absolute values. However, it is also possible to compare the last measured value with a subsequent measured value, so that the gradient is measured and the gradient is a measure of an impending breakthrough. Since the value based on this caking increases very quickly in comparison with a value based on thermal expansion, it is not falsified by the proportion from the thermal expansion.
Bei dem erfindungsgemäßen Verfahren genügt es, die Dehnungsmessung in einem Punkt einer jeden Kokillenwand vorzunehmen. Starke Anbackungen an der Kokillenwand lassen sich auf diese Weise sicher bestimmen. Um auch sehr kleine Anbackungen sicher erkennen zu können, ist es zweckmäßig, die Dehnungsmessung nicht nur in, sondern auch quer zur Strangauszugsrichtung vorzunehmen. Die Meßpunkte in und quer zur Strangauszugsrichtung sollten möglichst nahe beieinander liegen. Durch Verknüpfung dieser beiden Signale läßt sich die durch Wärme verursachte Komponente der Dehnung eliminieren, so daß das gewonnene Signal ausschließlich von der durch die Ausziehkräfte bei einer Anbackung bedingten kurzfristigen Dehnung bestimmt ist. Die Verknüpfung der Signale für die Dehnung in Strangauszugsrichtung und quer dazu läßt sich ohne großen Rechenaufwand in einer Brückenschaltung verwirklichen. Eine solche Brückenschaltung ist nicht nur einfach im Aufbau, sondern auch unanfällig gegen Störungen.In the method according to the invention, it is sufficient to carry out the strain measurement at a point on each mold wall. Heavy deposits on the mold wall can be reliably determined in this way. In order to be able to reliably detect even very small deposits, it is advisable to do the strain measurement not only in, but also across the strand extension direction. The measuring points in and across the strand extension direction should be as close as possible to each other. By combining these two signals, the component of the expansion caused by heat can be eliminated, so that the signal obtained is exclusively determined by the short-term expansion caused by the pull-out forces in the event of caking. The linking of the signals for stretching in the direction of the strand pull-out and transversely thereto can be implemented in a bridge circuit without great computation effort. Such a bridge circuit is not only simple in construction, but also insensitive to interference.
Obgleich es grundsätzlich ausreicht, an jeder Kokillenwand nur eine Messung vorzunehmen, sollten aus Sicherheitsgründen mehrere Meßpunkte vorgesehen sein, so daß man die Möglichkeit hat, von einem Meßpunkt auf den anderen umzuschalten. Es ist dann auch möglich, alle Meßpunkte gleichzeitig für die Auswertung heranzuziehen.Although it is generally sufficient to carry out only one measurement on each mold wall, several measuring points should be provided for safety reasons, so that it is possible to switch from one measuring point to the other. It is then also possible to use all measuring points simultaneously for the evaluation.
Um aus Wärmedehnung resultierende Fehler bei der Dehnungsmessung zu korrigieren, besteht nicht nur die Möglichkeit, den Gradienten der Dehnung oder zusätzlich zu der Dehnungsmessung in Strangauszugsrichtung die Dehnung quer dazu zu messen, sondern auch die Temperatur der Kokillenwand zu ermitteln und daraus mit Hilfe bekannter Zusammenhänge einen Dehnungswert zu ermitteln, der mit dem gemessenen Dehnungswert in Strangauszugsrichtung derart verknüpft wird, daß der so gewonnene Wert ein eindeutiges Kriterium für die Dehnung im Falle einer Anbackung ist.In order to correct errors in the strain measurement resulting from thermal expansion, it is not only possible to measure the gradient of the strain or, in addition to the strain measurement in the direction of the pull-out of the strand, the strain transverse to it, but also to determine the temperature of the mold wall and use it to unite it using known relationships To determine the elongation value, which is linked to the measured elongation value in the direction of the strand pull-out in such a way that the value obtained in this way is a clear criterion for the elongation in the event of caking.
Die Dehnungsmessung kann grundsätzlich an beliebiger Stelle einer jeden Kokillenwand vorgenommen werden. Es hat sich allerdings herausgestellt, daß es günstig ist, sie nicht zu dicht an die Ecken der Kokille zu legen, weil dort wegen der großen Steifheit der Konstruktion die Dehnung der Kokillenwand am geringsten ist. Deshalb ist es vorteilhaft, wenn die Punkte im mittleren Bereich der Kokillenwände liegen. Sie sollten von den Ecken der Kokille mindestens einThe strain measurement can in principle be carried out at any point on each mold wall. However, it has turned out that it is beneficial not to close to the corners of the mold, because there the stretch of the mold wall is the least due to the great rigidity of the construction. It is therefore advantageous if the points lie in the middle area of the mold walls. You should get at least one from the corners of the mold
Drittel der Breite der betreffenden Seitenwand entfernt liegen, vorzugsweise sollten sie in der Mitte der Wände liegen.One third of the width of the side wall in question, preferably should be in the middle of the walls.
Wird die Dehnungsmessung unmittelbar an den strangseitigen Teilen der Kokillenwände mittels geeigneter Sensoren, insbesondere Dehnungsmeßstreifen, vorgenommen, dann bedeutet das einen nicht unerheblichen Aufwand, insbesondere wegen der Zuleitungen zu den im Inneren des Wasserkastens angeordneten Fühlern und Leitungen. Um diese Probleme zu vermeiden, ist nach einer Ausgestaltung der Erfindung vorgesehen, daß die Dehnungsmessung an der strangfernen Außenwand des Wasserkastens dann vorgenommen wird, wenn der Wasserkasten mit der Kokilleninnenwand eine starre Einheit bildet.If the strain measurement is carried out directly on the strand-side parts of the mold walls by means of suitable sensors, in particular strain gauges, this means a not inconsiderable effort, in particular because of the supply lines to the sensors and lines arranged in the interior of the water tank. In order to avoid these problems, it is provided according to one embodiment of the invention that the strain measurement is carried out on the outer wall of the water box remote from the strand when the water box forms a rigid unit with the mold inner wall.
Im folgenden wird die Erfindung anhand einer ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Im einzelnen zeigen:
Figur 1- die Rückseite einer strangseitigen Wand einer Kokille,
- Figur 2
- eine Meßanordnung mit Dehnungsmeßstreifen und
Figur 3- ein Diagramm mit dem Ausgangssignal der Meßanordnung gemäß Figur 2.
- Figure 1
- the back of a strand-side wall of a mold,
- Figure 2
- a measuring arrangement with strain gauges and
- Figure 3
- 3 shows a diagram with the output signal of the measuring arrangement according to FIG. 2.
Auf der Rückseite der in Figur 1 dargestellten Breitseitenwand 1 befinden sich mittig zwei Dehnungsmeßstreifen 2a,2b, von denen der eine Dehnungsmeßstreifen 2a in Strangauszugsrichtung und der andere Dehnungsmeßstreifen 2b quer dazu angeordnet ist. Diese Dehnungsmeßstreifen 2a,2b bilden mit zwei Widerständen R3,R4 eine Brückenschaltung, in deren Diagonale ein Verstärker 3 angeordnet ist, der ein Ausgangssignal liefert. Die von einer Spannungsquelle 4 gespeiste Brückenschaltung ist so ausgelegt, daß der Verstärker 3 kein oder ein kleines Ausgangssignal liefert, wenn die Widerstandswerte der Dehnungsmeßstreifen 2a,2b gleich sind. Dies ist immer dann der Fall, wenn es wegen fehlender Anbackungen an der Kokillenwand bei wirksamen Ausziehkräften nur zu wärmebedingten Dehnungen kommt. Kommt es dagen zu einer Anbackung, dann wird die Brückenschaltung dadurch verstimmt, daß der Widerstandswert für den Dehnungsmeßstreifen 2a ansteigt. In diesem Fall liefert der Verstärker 3 ein plötzlich ansteigendes Ausgangssignal, wie in dem Dehnungszeitdiagramm der Figur 3 für die Zeit zwischen 140 und 150 sec dargestellt ist. Dieses plötzlich ansteigende Ausgangssignal wird in einer Auswerteschaltung ausgewertet. In Abhängigkeit von dieser Auswertung wird der Gießprozeß entweder verlangsamt oder unterbrochen.On the back of the
Claims (7)
dadurch gekennzeichnet, daß während des kontinuierlichen Strangabzuges die durch das Auftreten mechanischer Kräfte in Strangabzugsrichtung verursachte Dehnung der Innenwand der Kokille gemessen wird und die dabei anfallenden Meßwerte für die Steuerung des Gießprozesses verwendet werden, derart, daß beim Überschreiten vorgegebener Grenzwerte die Gießgeschwindigkeit verringert oder der Gießprozeß unterbrochen wird.Process for casting metals in a continuous casting installation, the strand being continuously drawn out of the mold and the casting process being controlled as a function of the stresses occurring when the strand is pulled out in the continuous casting installation,
characterized in that during the continuous strand withdrawal the elongation of the inner wall of the mold caused by the occurrence of mechanical forces in the strand withdrawal direction is measured and the measurement values obtained are used to control the casting process, such that when predetermined limit values are exceeded the casting speed is reduced or the casting process is interrupted.
dadurch gekennzeichnet, daß die Dehnung der Innenwand der Stranggießkokille quer zur Strangauszugsrichtung gemessen und mit dem Meßwert für die Dehnung in Strangauszugsrichtung derart verknüpft wird, daß der wärmebedingte Anteil der Dehnung eliminiert wird.Method according to claim 1,
characterized in that the elongation of the inner wall of the continuous casting mold is measured transversely to the extrusion direction and is linked to the measured value for the elongation in the extrusion direction in such a way that the heat-related portion of the expansion is eliminated.
dadurch gekennzeichnet, daß die Messungen für die Dehnungen in und quer zur Strangauszugsrichtung an möglicht nahe beieinander liegenden Stellen erfolgen.The method of claim 1 or 2,
characterized in that the measurements for the strains in and transverse to the strand extension direction are as close as possible to one another Places.
dadurch gekennzeichnet, daß die Messungen für die Dehnung im mittleren Bereich zwischen den Ecken jeder Kokillenwand erfolgen.Method according to one of claims 1 to 3,
characterized in that the measurements for the elongation take place in the central area between the corners of each mold wall.
dadurch gekennzeichnet, daß die Messungen für die Dehnung an mehreren Stellen jeder Kokillenwand erfolgen.Method according to one of claims 1 to 4,
characterized in that the measurements for the elongation take place at several locations on each mold wall.
dadurch gekennzeichnet, daß bei einer Kokille mit Wasserkasten, bei dem die strangferne Wand mit der strangseitigen Wand eine starre Einheit bildet, die Messungen für die Dehnung an der strangfernen Wand des Wasserkastens erfolgen.Method according to one of claims 1 to 5,
characterized in that, in the case of a mold with a water tank, in which the wall remote from the strand forms a rigid unit with the wall on the strand side, the measurements for the elongation are carried out on the wall of the water tank remote from the rope.
dadurch gekennzeichnet, daß am Meßort der Dehnung die Temperatur bestimmt und als Korrekturwert bei der Auswertung des Meßwertes für die Dehnung berücksichtigt wird.Method according to one of claims 1 to 6,
characterized in that the temperature is determined at the measurement site of the expansion and is taken into account as a correction value when evaluating the measurement value for the expansion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4137588A DE4137588C2 (en) | 1991-11-15 | 1991-11-15 | Process for casting metals in a continuous caster |
| DE4137588 | 1991-11-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0542024A1 true EP0542024A1 (en) | 1993-05-19 |
| EP0542024B1 EP0542024B1 (en) | 1997-01-02 |
Family
ID=6444874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92118311A Expired - Lifetime EP0542024B1 (en) | 1991-11-15 | 1992-10-27 | Method for continuous casting of molten metal in a continuous casting machine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5482106A (en) |
| EP (1) | EP0542024B1 (en) |
| CA (1) | CA2082887A1 (en) |
| DE (2) | DE4137588C2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004082869A1 (en) * | 2003-03-22 | 2004-09-30 | Sms Demag Aktiengesellschaft | Method for determining a measured temperature in continuous casting moulds and said continuous casting mould |
| RU2448804C1 (en) * | 2008-06-25 | 2012-04-27 | Смс Зимаг Аг | Metal casting crystalliser |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19843033B4 (en) * | 1998-09-19 | 2017-11-09 | Sms Group Gmbh | Breakthrough detection method for a continuous casting mold |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2501868C3 (en) * | 1975-01-15 | 1978-08-03 | Mannesmann Ag, 4000 Duesseldorf | Process for regulating and monitoring the continuous casting of steel |
| DE2923900C2 (en) * | 1979-06-13 | 1984-09-13 | Hoesch Werke Ag, 4600 Dortmund | Method for preventing the strand from breaking through in continuous casting plants |
| US4774998A (en) * | 1985-02-01 | 1988-10-04 | Nippon Steel Corporation | Method and apparatus for preventing cast defects in continuous casting plant |
| EP0389139A2 (en) * | 1989-03-20 | 1990-09-26 | Inland Steel Company | Break-out detection in continuous casting |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5362733A (en) * | 1976-11-18 | 1978-06-05 | Nippon Steel Corp | Horizontal continuous casting method |
| DE3037048A1 (en) * | 1980-10-01 | 1982-04-29 | Böhler AG, 4000 Düsseldorf | METHOD FOR CONTROLLING THE STRAND DRAWER |
| US4615375A (en) * | 1983-04-18 | 1986-10-07 | United States Steel Corporation | Continuous casting mold friction monitor |
| DE3541445A1 (en) * | 1985-11-23 | 1987-06-04 | Mannesmann Ag | Continuous casting mould with temperature-measuring devices |
| JPS62286655A (en) * | 1986-06-05 | 1987-12-12 | Nippon Kokan Kk <Nkk> | Judging apparatus for casting abnormality |
| JPH02247054A (en) * | 1989-03-20 | 1990-10-02 | Sumitomo Metal Ind Ltd | Method for detecting abnormality of powder involution in continuous casting |
-
1991
- 1991-11-15 DE DE4137588A patent/DE4137588C2/en not_active Expired - Fee Related
-
1992
- 1992-10-27 DE DE59207803T patent/DE59207803D1/en not_active Expired - Fee Related
- 1992-10-27 EP EP92118311A patent/EP0542024B1/en not_active Expired - Lifetime
- 1992-11-13 CA CA002082887A patent/CA2082887A1/en not_active Abandoned
-
1994
- 1994-08-06 US US08/286,986 patent/US5482106A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2501868C3 (en) * | 1975-01-15 | 1978-08-03 | Mannesmann Ag, 4000 Duesseldorf | Process for regulating and monitoring the continuous casting of steel |
| DE2923900C2 (en) * | 1979-06-13 | 1984-09-13 | Hoesch Werke Ag, 4600 Dortmund | Method for preventing the strand from breaking through in continuous casting plants |
| US4774998A (en) * | 1985-02-01 | 1988-10-04 | Nippon Steel Corporation | Method and apparatus for preventing cast defects in continuous casting plant |
| EP0389139A2 (en) * | 1989-03-20 | 1990-09-26 | Inland Steel Company | Break-out detection in continuous casting |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004082869A1 (en) * | 2003-03-22 | 2004-09-30 | Sms Demag Aktiengesellschaft | Method for determining a measured temperature in continuous casting moulds and said continuous casting mould |
| RU2448804C1 (en) * | 2008-06-25 | 2012-04-27 | Смс Зимаг Аг | Metal casting crystalliser |
Also Published As
| Publication number | Publication date |
|---|---|
| US5482106A (en) | 1996-01-09 |
| CA2082887A1 (en) | 1993-05-16 |
| DE59207803D1 (en) | 1997-02-13 |
| DE4137588C2 (en) | 1994-10-06 |
| EP0542024B1 (en) | 1997-01-02 |
| DE4137588A1 (en) | 1993-05-19 |
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