EP1133370B1 - Method for oscillating a continuous-casting mould by means of variable oscillation parameters - Google Patents

Method for oscillating a continuous-casting mould by means of variable oscillation parameters Download PDF

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Publication number
EP1133370B1
EP1133370B1 EP99958061A EP99958061A EP1133370B1 EP 1133370 B1 EP1133370 B1 EP 1133370B1 EP 99958061 A EP99958061 A EP 99958061A EP 99958061 A EP99958061 A EP 99958061A EP 1133370 B1 EP1133370 B1 EP 1133370B1
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Prior art keywords
oscillation
frequency
casting
strip
speed
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German (de)
French (fr)
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EP1133370A1 (en
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Jörg WESTPHAL
Michael Vonderbank
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SMS Siemag AG
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SMS Schloemann Siemag AG
Schloemann Siemag AG
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/053—Means for oscillating the moulds
    • 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
    • B22D11/166—Controlling or regulating processes or operations for mould oscillation

Definitions

  • the invention relates to a method for oscillating a steel continuous casting mold by means of an oscillation device, the lifting height depending on the Strand withdrawal speed is set and at a leading speed the mold relative to the strand, the so-called negative strip, liquid or solid Pouring medium is drawn into the gap between the mold and the strand.
  • the mold used for this is made in a periodic movement offset, thereby causing a relative movement between the strand and the mold produce.
  • a grainy on the bath surface in the mold to powdery casting powder after melting as a lubricant in the gap between The mold and strand are drawn in and thus the friction between the mold and Strand decreased.
  • This effect makes the mold wear considerably reduced and prevents the strand from sticking to the mold wall.
  • the periodic mold movement usually forms in the position and speed curve a sine wave that has a constant stroke, e.g. with eccentric oscillators, and a period adapted to the casting speed having.
  • This alternating upsetting or stretching process of the strand shell causes one oscillating excitation of the entire strand. If these are in an unfavorable, For example, there is a harmonic frequency range, this can cause an oscillation of the entire casting plant. This adverse effect is all the more stronger, the greater the coefficient of friction between the mold and the strand shell, d. H. the lower the lubrication and therefore the slag supply.
  • document DE 37 04 793 C2 describes a mold lifting device with two on a lifting table for the continuous casting mold or directly on this articulated, rotatably drivable eccentric shaft.
  • a non-sinusoidal movement of the mold is caused by the conscious Generated use of the cardan error, which occurs when a propeller shaft not in alignment between the shafts.
  • cardan error which occurs when a propeller shaft not in alignment between the shafts.
  • Document EP 0 121 622 B1 describes a process for continuous casting using a mold stored in a frame, which by a electro-hydraulic servo is vibrated.
  • Document EP 0 618 023 A1 discloses a process for continuous casting, in which a mold with a comparatively long side wall and a comparatively narrow transverse wall is used. At the same time as the oscillation of the With every vibration, molds are in a time phase in which the difference of the Mold speed and the strand withdrawal speed a predetermined Value exceeds the side walls of the mold by a small transverse amount moved away from the cast strand, while in the remaining time with approximately same speed of strand and mold the side walls closer again the cast strand are created.
  • the mold should be the tensile and Upsetting forces are reduced so that the depth of the oscillation marks is reduced and the middle of the strand shows less segregation. In this case the penetration of the slag into the gap between the strand and the mold through the alternating enlargement and narrowing of the mold easier.
  • EP 0 325 931 B1 describes a method for oscillating a steel continuous casting mold by means of an oscillation device, the lifting height depending is set by the strand withdrawal speed. With a sawtooth-like Oscillation movement overtakes the mold throughout Downward movement of the strand. In a first area with low strand withdrawal speeds becomes the oscillation frequency while maintaining a negative strip time booted. When the strand withdrawal speed is increased further the oscillation frequency is kept constant in a second area and the lifting height is reduced depending on the strand withdrawal speed Retention of negative strip time increased.
  • the object of the invention to provide a method of the type mentioned in the preamble of claim 1, which overcoming the disadvantages, difficulties and technical limits especially at higher casting or strand withdrawal speeds the production of continuous casting products with optimal quality enables the acceleration of the masses of a continuous caster to be reduced Extraction forces on the oscillators are reduced, as is the negative strip time with increasing Keeps the casting speed at least constant and draws in evenly of slag by setting a constant relative speed between the mold and the strand.
  • both the frequency and the stroke are independent of each other the casting speed can be varied, as long and / or constant as possible negative / positive strip time can be achieved.
  • Non-sinudial trapezoidal forms of speed are marked due to an asymmetrical course, especially for fast pouring Casting machines is suitable and seen in the downward movement in the casting direction is slower than the upward movement.
  • Fig. 1 shows the diagram plotted against the casting speed with increasing Line withdrawal speed decreasing time values [ms] for the course of the absolute Negative strip time according to the solid line according to the state of the Technique and according to the dotted line according to the invention. It shows, that on average the negative strip time in the method according to the invention is average is 25% larger than in the prior art.
  • FIG. 3 shows vibration curves with symmetrical or asymmetrical mold oscillation according to the invention.
  • the stroke of 3.9 mm is approximately 25% greater than that of the corresponding curve in FIG. 3 (3.1 mm), and the acceleration is 4.0 m / s 2 , ie it is approximately 30 % less than in the corresponding vibration example of FIG. 3 (5.3 m / sec 2 ).

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

Abstract

The invention relates to a method for oscillating a continuous-casting mould by means of vertically alternating movements in or against the direction of casting, the stroke and frequency of the oscillation being parameters which can be set in accordance with casting speed. If the mould presents a forward slip in relation to the strand, that is the so-called negative strip, liquid and/or solid casting material is drawn into the gap between mould and strand. By uncoupling the linear relation between casting speed and the oscillation parameters stroke/frequency the parameters are varied insofar as with increasing casting speed acceleration of the moving system is reduced overall by way of a relative decrease in frequency and relative increase in stroke.

Description

Die Erfindung betrifft ein Verfahren zum Oszillieren einer Stahlstranggießkokille mittels einer Oszillationseinrichtung, wobei die Hubhöhe in Abhängigkeit von der Strangabzugsgeschwindigkeit eingestellt wird und bei voreilender Geschwindigkeit der Kokille relativ zum Strang, dem sogenannten Negativstrip, flüssiges oder festes Gießmedium in den Spalt zwischen Kokille und Strang eingezogen wird.The invention relates to a method for oscillating a steel continuous casting mold by means of an oscillation device, the lifting height depending on the Strand withdrawal speed is set and at a leading speed the mold relative to the strand, the so-called negative strip, liquid or solid Pouring medium is drawn into the gap between the mold and the strand.

Beim Stranggießen wird die hierfür verwendete Kokille in eine periodische Bewegung versetzt, um dadurch ein Relativbewegung zwischen Strang und Kokille zu erzeugen. Dabei wird auf der Badoberfläche in der Kokille befindliches kömiges bis pulveriges Gießpulver nach Aufschmelzen als Gleitmittel in den Spalt zwischen Kokille und Strang eingezogen und damit die Reibung zwischen Kokille und Strang verringert. Durch diesen Effekt wird ein Verschleiß der Kokille erheblich verringert sowie ein Festhaften des Stranges an der Kokillenwand verhindert.During continuous casting, the mold used for this is made in a periodic movement offset, thereby causing a relative movement between the strand and the mold produce. Thereby, there is a grainy on the bath surface in the mold to powdery casting powder after melting as a lubricant in the gap between The mold and strand are drawn in and thus the friction between the mold and Strand decreased. This effect makes the mold wear considerably reduced and prevents the strand from sticking to the mold wall.

Die periodische Kokillenbewegung bildet üblicherweise im Positions- und Geschwindigkeitsverlauf eine Sinus-Schwingung, die einen konstanten Hub, bspw. bei Exzenteroszillatoren, und eine der Gießgeschwindigkeit angepaßte Periodendauer aufweist.The periodic mold movement usually forms in the position and speed curve a sine wave that has a constant stroke, e.g. with eccentric oscillators, and a period adapted to the casting speed having.

Während eines Oszillationszyklus wechselt beim Vorbeigleiten der Kokille am Strang die Art der Reibung: During an oscillation cycle, the mold changes as the glides past Strand the type of friction:

Bei relativ zum Strang voreilender Geschwindigkeit der Kokille, als Negativstrip bezeichnet, sowie nach deren Richtungsumkehr zum Positivstrip liegt Gleitreibung vor; zwischen Negativstrip und Positivstrip im Bereich der Richtungsumkehr liegt Haftreibung vor.With the mold leading speed relative to the strand, as a negative strip referred to, and after their reversal of direction to the positive strip lies sliding friction in front; between negative strip and positive strip in the area of reversal of direction Stiction before.

Während der Gleitreibung werden von der Kokille abwechselnd Zug- und Druckspannungen auf die Strangschale übertragen.During the sliding friction, tensile and compressive stresses alternate between the mold transferred to the strand shell.

Bei annähernd gleichen Geschwindigkeiten zwischen Kokille und Strang im Zustand der Haftreibung gleichen sich die resultierenden Zug- und Druckspannungen annähernd aus. Bei Erhöhung oder Erniedrigung der relativen Kokillengeschwindigkeit reißt sich die Kokille vom Strang los. Dies führt zum Stauchen und damit zu einer Geschwindigkeitserhöhung der Strangschale, wenn sich die Kokille auf ihrem Weg nach unten befindet, und umgekehrt zu einer Dehnung und damit zu einer Geschwindigkeitsreduzierung der Strangschale, wenn sich die Kokille auf ihrem Weg nach oben befindet.At approximately the same speeds between the mold and the strand in the state the resulting tensile and compressive stresses are the same as static friction approximately from. If the relative mold speed is increased or decreased the mold tears itself off the strand. This leads to upsetting and thus an increase in the speed of the strand shell when the mold is on its Way down, and vice versa to an elongation and thus to one Speed reduction of the strand shell when the mold is on her Way is up.

Dieser abwechselnde Stauch- bzw. Dehnvorgang der Strangschale bewirkt eine oszillierende Anregung des gesamten Stranges. Wenn diese in einem ungünstigen, bspw. harmonischen Frequenzbereich liegt, kann dieses zu einem Aufschwingen der gesamten Gießanlage führen. Dieser nachteilige Effekt wird um so stärker, je größer der Reibungskoeffizient zwischen Kokille und Strangschale ist, d. h. je geringer die Schmierung und damit die Schlackenversorgung ist.This alternating upsetting or stretching process of the strand shell causes one oscillating excitation of the entire strand. If these are in an unfavorable, For example, there is a harmonic frequency range, this can cause an oscillation of the entire casting plant. This adverse effect is all the more stronger, the greater the coefficient of friction between the mold and the strand shell, d. H. the lower the lubrication and therefore the slag supply.

Hieraus ergeben sich für Stranggießanlagen bei höheren Gießgeschwindigkeiten, bspw. größer 4,5 m/min, folgende Nachteile:

  • 1. Die Dauer der Oszillationsperiode wird mit steigender Gießgeschwindigkeit kürzer. Hierdurch nimmt proportional die Zeit, in welcher flüssiges und festes Gießmedium zur Minimierung der Reibung in den Spalt zwischen Kokille und Strang eindringen kann, ab. Dadurch erhöht sich der Verschließ der Kokille und die Gefahr, daß der Strang an der Kokillenwandung festklebt steigt, was schlimmstenfalls zu einem Durchbruch führen kann.
  • 2. Erhöhte Gießgeschwindigkeiten führen zu erhöhten Oszillationsfrequenzen und hierdurch zu erhöhten Beschleunigungen der bewegten Massen. Zudem wird die Gießanlage durch vermehrten Wechsel von Gleitreibung und Haftreibung in Folge höherer Frequenz zum Schwingen angeregt.
    • For continuous casting plants at higher casting speeds, for example greater than 4.5 m / min, this has the following disadvantages:
  • 1. The duration of the oscillation period becomes shorter with increasing casting speed. As a result, the time in which liquid and solid casting medium can penetrate into the gap between the mold and the strand in order to minimize the friction decreases proportionally. This increases the closure of the mold and the risk that the strand sticks to the mold wall, which in the worst case can lead to a breakthrough.
  • 2. Increased casting speeds lead to increased oscillation frequencies and thus to increased accelerations of the moving masses. In addition, the casting system is made to vibrate by the increased alternation of sliding friction and static friction as a result of a higher frequency.

    • Verfahren zur Erzeugung der Oszillation einer Stranggießkokille sind beim Stand der Technik bekannt.Methods for generating the oscillation of a continuous casting mold are on the stand known in the art.

    Beispielsweise beschreibt das Dokument DE 37 04 793 C2 eine Kokillen-Hubvorrichtung mit zwei an einem Hubtisch für die Stranggießkokille oder direkt an dieser angelenkten, drehbar antreibbaren Exzenterwellen. In die Verbindung zwischen dem Drehantrieb und den Exzenterwellen ist mindestens eine Gelenkwelle eingesetzt, bei welcher der von der Exzenterwelle abgewandte Gelenkkopf lageveränderbar angeordnet ist und die Gelenkköpfe gegeneinander verdrehbar sind.For example, document DE 37 04 793 C2 describes a mold lifting device with two on a lifting table for the continuous casting mold or directly on this articulated, rotatably drivable eccentric shaft. In the connection There is at least one cardan shaft between the rotary drive and the eccentric shafts used, in which the rod end facing away from the eccentric shaft is arranged changeable and the rod ends rotatable against each other are.

    Ein nicht sinusförmiger Bewegungsablauf der Kokille wird durch den bewußten Gebrauch des Kardanfehlers erzeugt, welcher auftritt, wenn eine Gelenkwelle nicht fluchtend zwischen den Wellen eingesetzt wird. Durch Veränderung von Höhe und seitlicher Verschiebung des Drehantriebes sind unterschiedliche nicht sinusförmige Bewegungsabläufe der Kokille realisierbar.A non-sinusoidal movement of the mold is caused by the conscious Generated use of the cardan error, which occurs when a propeller shaft not in alignment between the shafts. By changing height and lateral displacement of the rotary drive are different non-sinusoidal Movements of the mold can be realized.

    Das Dokument EP 0 121 622 B1 beschreibt ein Verfahren für das Stranggießen unter Verwendung einer in einem Rahmen gelagerten Kokille, welcher durch eine elektrohydraulische Servoeinrichtung in Schwingungen versetzt wird. Die Vorrichtung zur Schwingungserzeugung wird gemäß einem von einem Funktionsgenerator erzeugten vorgewählten Schwingungs-Amplitudensignal bei einer Frequenz betrieben, welche höher als die Eigenfrequenz der Schwingungsvorrichtung ist.Document EP 0 121 622 B1 describes a process for continuous casting using a mold stored in a frame, which by a electro-hydraulic servo is vibrated. The device for generating vibrations according to one of a function generator generated preselected vibration amplitude signal at a frequency operated, which is higher than the natural frequency of the vibration device.

    Das Dokument EP 0 618 023 A1 offenbart ein Verfahren für das Stranggießen, bei dem eine Kokille mit einer vergleichsweise langen Seitenwand und einer vergleichsweise schmalen Querwand verwendet wird. Zugleich mit der Oszillation der Kokille werden bei jeder Schwingung in einer Zeitphase, bei der die Differenz der Kokillengeschwindigkeit und der Strangabzugsgeschwindigkeit einen vorgegebenen Wert überschreitet, die Seitenwände der Kokille um einen geringen Querbetrag vom Gußstrang wegbewegt, während in der verbleibenden Zeit mit annähernd gleicher Geschwindigkeit von Strang und Kokille die Seitenwände wieder näher an den Gußstrang angelegt werden. Durch dieses abwechselnde Erweitern und Verschmälern der Kokille sollen die auf die Strangschale einwirkenden Zug- und Stauchkräfte reduziert werden, so daß die Tiefe der Oszillationsmarken verringert wird und die Strangmitte eine geringere Seigerung aufweist. In diesem Fall wird das Eindringen der Schlacke in den Spalt zwischen Strang und Kokille durch das abwechselnde Erweitem und Verschmälern der Kokille erleichtert.Document EP 0 618 023 A1 discloses a process for continuous casting, in which a mold with a comparatively long side wall and a comparatively narrow transverse wall is used. At the same time as the oscillation of the With every vibration, molds are in a time phase in which the difference of the Mold speed and the strand withdrawal speed a predetermined Value exceeds the side walls of the mold by a small transverse amount moved away from the cast strand, while in the remaining time with approximately same speed of strand and mold the side walls closer again the cast strand are created. Through this alternating enlargement and narrowing the mold should be the tensile and Upsetting forces are reduced so that the depth of the oscillation marks is reduced and the middle of the strand shows less segregation. In this case the penetration of the slag into the gap between the strand and the mold through the alternating enlargement and narrowing of the mold easier.

    Aus dem Stand der Technik ist es bekannt, daß negativer Strip, Amplitude und Frequenz der Kokillenoszillation sowie deren auf einen Betriebsfall abgestimmte Kombination für die Qualität des Gußproduktes maßgeblich sind und auf die Eigenschaften der zu vergießenden Schmelzen und des verwendeten Gießpulvers eingestellt werden müssen. Die Auswahl der Oszillationsparameter ist wesentlich für die Optimierung des Stranggießprozesses und besteht in einer optimalen Kombination von Amplitude und Frequenz, wobei der Negativstrip innerhalb bestimmter Grenzen liegen soll, üblicherweise zwischen 15 und 40 %.It is known from the prior art that negative strip, amplitude and Frequency of the mold oscillation, as well as its frequency matched to an operating case Combination are decisive for the quality of the cast product and the properties the melts to be cast and the mold powder used must be set. The choice of oscillation parameters is essential for the optimization of the continuous casting process and consists in an optimal Combination of amplitude and frequency, with the negative strip within certain Limits should be, usually between 15 and 40%.

    Diese Zusammenhänge machen deutlich, daß bei sinusförmiger Schwingung der Kokille eine beliebige Kombination der Oszillationsparameter nicht möglich ist. Es besteht daher die Bestrebung, die Wahl der Oszillationsparameter von der Gießgeschwindigkeit zu entkoppeln.These relationships make it clear that with sinusoidal vibration the Chill mold any combination of the oscillation parameters is not possible. It therefore there is an effort to choose the oscillation parameters based on the casting speed to decouple.

    Die EP 0 325 931 B1 beschreibt ein Verfahren zum Oszillieren einer Stahlstranggießkokille mittels einer Oszillationseinrichtung, wobei die Hubhöhe in Abhängigkeit von der Strangabzugsgeschwindigkeit eingestellt wird. Bei einer sägezahnähnlichen Oszillationsbewegung überholt die Kokille während der ganzen Abwärtsbewegung den Strang. In einem ersten Bereich mit niedrigen Strangabzugsgeschwindigkeiten wird die Oszillationsfrequenz unter Beibehaltung einer Negativ-Strip-Zeit hochgefahren. Bei weiterer Erhöhung der Strangabzugsgeschwindigkeit wird in einem zweiten Bereich die Oszillationsfrequenz konstant gehalten und die Hubhöhe wird in Abhängigkeit von der Strangabzugsgeschwindigkeit unter Beibehaltung der Negativ-Strip-Zeit vergrößert.EP 0 325 931 B1 describes a method for oscillating a steel continuous casting mold by means of an oscillation device, the lifting height depending is set by the strand withdrawal speed. With a sawtooth-like Oscillation movement overtakes the mold throughout Downward movement of the strand. In a first area with low strand withdrawal speeds becomes the oscillation frequency while maintaining a negative strip time booted. When the strand withdrawal speed is increased further the oscillation frequency is kept constant in a second area and the lifting height is reduced depending on the strand withdrawal speed Retention of negative strip time increased.

    Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren der im Oberbegriff von Anspruch 1 genannten Art anzugeben, welches unter Überwindung der erwähnten Nachteile, Schwierigkeiten und technischen Grenzen insbesondere bei höheren Gieß- bzw. Strangabzugsgeschwindigkeiten die Produktion von Stranggießprodukten mit optimaler Qualität ermöglicht, die Beschleunigung der Massen einer Stranggießanlage reduziert, die Ausziehkräfte an den Oszillatoren verringert, sowie die Negativ-Strip-Zeit bei steigender Gießgeschwindigkeit zumindest konstant hält und ein gleichmäßiges Einziehen von Schlacke durch Einstellung einer konstanten Relativgeschwindigkeit zwischen Kokille und Strang ermöglicht.Starting from the aforementioned prior art, the object of the invention to provide a method of the type mentioned in the preamble of claim 1, which overcoming the disadvantages, difficulties and technical limits especially at higher casting or strand withdrawal speeds the production of continuous casting products with optimal quality enables the acceleration of the masses of a continuous caster to be reduced Extraction forces on the oscillators are reduced, as is the negative strip time with increasing Keeps the casting speed at least constant and draws in evenly of slag by setting a constant relative speed between the mold and the strand.

    Zur Lösung der Aufgabe wird bei einem Verfahren der im Obergriff von Anspruch 1 genannten Art mit der Erfindung vorgeschlagen, dass zur Erzielung einer möglichst langen absoluten bzw. prozentualen Negativ-Strip-Zeit, bzw. Positiv-Strip-Zeit bei konstanter Giessgeschwindigkeit, und einer möglichst konstanten absoluten bzw. prozentualen negativen bzw. positiven Strip-Zeit bei steigender Giessgeschwindigkeit sowohl die Frequenz als auch der Hub der Oszillationsbewegung unabhängig voneinander in dem Sinne variiert werden, dass bei steigender Giessgeschwindigkeit die Beschleunigung der bewegten Kokille durch relative Erniedrigung der Frequenz bei relativ vergrößertem Hub insgesamt verringert wird.To solve the problem is in a method in the control of claim 1 mentioned type proposed with the invention that to achieve a possible long absolute or percentage negative strip time or positive strip time at constant casting speed, and an absolute constant as possible or percentage negative or positive strip time with increasing casting speed both the frequency and the stroke of the oscillation movement can be varied independently in the sense that with increasing Pouring speed the acceleration of the moving mold by relative lowering the frequency is reduced overall with a relatively increased stroke.

    Mit großem Vorteil wird durch das Verfahren nach der Erfindung erreicht, daß bei gleicher Gießgeschwindigkeit die Beschleunigung des gesamten bewegten Systems durch Absenkung der Frequenz gesenkt bzw. bei steigender Gießgeschwindigkeit annähernd konstant gehalten wird.With great advantage is achieved by the method according to the invention that at same casting speed the acceleration of the entire moving system by lowering the frequency or increasing the casting speed is kept approximately constant.

    Dadurch, daß sowohl die Frequenz als auch der Hub unabhängig voneinander mit der Gießgeschwindigkeit variiert werden, kann eine möglichst lange und/oder konstante negative/positive Strip-Zeit erzielt werden.Because both the frequency and the stroke are independent of each other the casting speed can be varied, as long and / or constant as possible negative / positive strip time can be achieved.

    Durch das Frequenzabsenkungsverfahren mit dynamisch angepaßtem Oszillationshub ergeben sich folgende vorteilhafte Auswirkungen für Sinusoszillationen:

    • Die Beschleunigungen der Massen werden um bis zu 25 % reduziert, womit auch die Ausziehkräfte an den Oszillatoren bedeutend verringert werden.
    • Eine resultierende Schwingung des Systems der Gießmaschine wird unterbunden;
    • die Fundamente und die mechanischen Einrichtungen werden weniger belastet;
    • der Gießspiegel in der Kokille wird nicht durch Schwingungen angeregt;
    • die Negativ-Strip-Zeit ist prozentual gleich, jedoch absolut bis um 30 % länger. Dem Gießmedium wird eine längere Zeit zu Einziehen und Ausbreiten im Kaliber zwischen Strangschale und Kupferplatte zur Verfügung gestellt.
    • Eine gezielte Variation der absoluten Negativ-Strip-Zeit wird ermöglicht;
    • die Negativ-Strip-Zeit kann bei steigender Gießgeschwindigkeit konstant gehalten werden;
    • ein konstantes und gleichmäßiges Einziehen von Schlacke wird durch Einstellung einer konstanten Relativgeschwindigkeit zwischen Kokille und Strang erreicht;
    • eine gleichmäßige Versorgung von Schlacken-Gleitmittel ist bei steigenden Gießgeschwindigkeiten durch Anpassung von Hub und Frequenz möglich;
    • insgesamt können höhere Gießgeschwindigkeiten verwirklicht werden.
    The frequency reduction method with a dynamically adjusted oscillation stroke has the following advantageous effects for sine oscillations:
    • The accelerations of the masses are reduced by up to 25%, which also significantly reduces the pulling forces on the oscillators.
    • A resulting vibration of the system of the casting machine is prevented;
    • the foundations and mechanical equipment are less stressed;
    • the mold level in the mold is not excited by vibrations;
    • the negative strip time is the same in percentage, but absolutely up to 30% longer. The casting medium is given a longer period of time to be drawn in and spread out in the caliber between the strand shell and the copper plate.
    • A targeted variation of the absolute negative strip time is made possible;
    • the negative strip time can be kept constant with increasing casting speed;
    • a constant and even intake of slag is achieved by setting a constant relative speed between the mold and the strand;
    • A uniform supply of slag lubricant is possible with increasing casting speeds by adjusting the stroke and frequency;
    • overall, higher casting speeds can be achieved.

    Ähnliche Vorteile ergeben sich auch für andere nicht-sinudiale Oszillationsbewegungen wie bspw. trapezförmige, sägezahnartige Oszillationsbewegungen, insbesondere hinsichtlich einer weiteren Reduzierung der Massenbeschleunigung sowie gezielte Gießpulverschmierung und alle anderen vorerwähnten neuen Möglichkeiten. Nicht-sinudiale trapezähnliche Geschwindigkeitsformen sind gekennzeichnet durch einen asymmetrischen Verlauf, der speziell für schnell gießende Gießmaschinen geeignet ist und in der Abwärtsbewegung in Gießrichtung gesehen langsamer als in der Aufwärtsbewegung ist.Similar advantages result for other non-sinudial oscillation movements such as trapezoidal, sawtooth-like oscillating movements, in particular regarding a further reduction in mass acceleration as well targeted casting powder lubrication and all other new possibilities mentioned above. Non-sinudial trapezoidal forms of speed are marked due to an asymmetrical course, especially for fast pouring Casting machines is suitable and seen in the downward movement in the casting direction is slower than the upward movement.

    Im folgenden werden Ausführungsbeispiele der Erfindung anhand von graphischen Darstellungen von Diagrammen und Schwingungskurven näher erläutert.
    Es zeigen:

    Fig. 1
    im Diagramm über der Gießgeschwindigkeit aufgetragene Vergleichskurven für den Verlauf der absoluten Negativ-Strip-Zeit
  • a) nach dem Stand der Technik
  • b) nach der Erfindung.
    •
    Fig. 2
    Schwingungskurven symmetrischer bzw. asymmetrischer Kokillenoszillation nach dem Stand der Technik.
    Fig. 3
    Schwingungskurven symmetrischer bzw. asymmetrischer Kokillenoszillation nach der Erfindung.
    Tabelle I
    enthält ein Zahlenbeispiel für die Schwingungskurven der Figur 2;
    Tabelle II
    enthält ein Zahlenbeispiel für die Schwingungskurven der Figur 3.
    Exemplary embodiments of the invention are explained in more detail below with the aid of graphic representations of diagrams and oscillation curves.
    Show it:
    Fig. 1
    Comparison curves plotted against the casting speed in the diagram for the course of the absolute negative strip time
  • a) according to the state of the art
  • b) according to the invention.
    • Fig. 2
    Vibration curves of symmetrical or asymmetrical mold oscillation according to the prior art.
    Fig. 3
    Vibration curves of symmetrical or asymmetrical mold oscillation according to the invention.
    Table I
    contains a numerical example for the vibration curves of Figure 2;
    Table II
    contains a numerical example for the vibration curves of FIG. 3.

    Fig. 1 zeigt im Diagramm über der Gießgeschwindigkeit aufgetragen mit steigender Strangabzugsgeschwindigkeit sinkende Zeitwerte [ms] für den Verlauf der absoluten Negativ-Strip-Zeit gemäß der ausgezogenen Linie nach dem Stand der Technik und gemäß der punktierten Linie nach der Erfindung. Es zeigt sich, daß im Durchschnitt die Negativ-Strip-Zeit beim Verfahren nach der Erfindung durchschnittlich um 25 % größer ist als beim Stand der Technik.Fig. 1 shows the diagram plotted against the casting speed with increasing Line withdrawal speed decreasing time values [ms] for the course of the absolute Negative strip time according to the solid line according to the state of the Technique and according to the dotted line according to the invention. It shows, that on average the negative strip time in the method according to the invention is average is 25% larger than in the prior art.

    In Fig. 2 sind Schwingungskurven mit symmetrischer bzw. asymmetrischer Kokillenoszillation nach dem Stand der Technik dargestellt. Der Hub beträgt maximal 3,1 mm, während die Frequenz mit 6,6 Hz 396 Schwingungen/min. aufweist. Der entsprechende Beschleunigungswert ist relativ hoch und beträgt 5,3 m/s2 (siehe Tabelle I).2 shows vibration curves with symmetrical or asymmetrical mold oscillation according to the prior art. The stroke is a maximum of 3.1 mm, while the frequency with 6.6 Hz 396 vibrations / min. having. The corresponding acceleration value is relatively high and is 5.3 m / s 2 (see Table I).

    Fig. 3 zeigt Schwingungskurven mit symmetrischer bzw. asymmetrischer Kokillenoszillation nach der Erfindung. Dabei ist der Hub mit 3,9 mm um ca. 25 % größer als bei der entsprechenden Kurve in Fig. 3 (3,1 mm), und die Beschleunigung beträgt 4,0 m/s2, d. h. sie ist um ca. 30 % geringer als im entsprechenden Schwingungsbeispiel der Fig. 3 (5,3 m/sec2).3 shows vibration curves with symmetrical or asymmetrical mold oscillation according to the invention. The stroke of 3.9 mm is approximately 25% greater than that of the corresponding curve in FIG. 3 (3.1 mm), and the acceleration is 4.0 m / s 2 , ie it is approximately 30 % less than in the corresponding vibration example of FIG. 3 (5.3 m / sec 2 ).

    Damit erweist sich, daß beim erfindungsgemäßen Verfahren zum Oszillieren einer Stranggießkokille mittels einer unabhängigen Beziehung zwischen Gießgeschwindigkeit und den Oszillationsparametem Hub/Frequenz die Beschleunigungswerte des bewegten Systems entsprechend dem Hauptanspruch durch relative Erniedrigung der Frequenz bei relativ vergrößertem Hub insgesamt signifikant verringert wird.This proves that in the method according to the invention for oscillating a Continuous casting mold by means of an independent relationship between casting speed and the oscillation parameters stroke / frequency the acceleration values of the moving system according to the main claim through relative degradation the frequency significantly reduced with a relatively larger stroke becomes.

    Claims (8)

    1. Method for oscillating a steel continuous casting chill mould by means of an oscillating device, wherein the stroke length is set in dependence on the strip discharge speed and in the case of a higher speed of the chill mould relative to the strip, i.e. sotermed negative strip, liquid or solid casting medium is drawn into the gap between chill mould and strip, characterised in that for attainment of a longest possible absolute or percentage negative or positive strip time with constant casting speed and a constant as possible absolute or percentage negative or positive strip time with increasing casting speed both the frequency and the stroke of the oscillation movement are varied independently of one another in the sense that with increasing casting speed the acceleration of the moved chill mould is reduced overall by relative lowering of the speed with relatively increased stroke.
    2. Method according to claim 1, characterised in that the oscillation frequency is tracked in a diagram over the casting speed and in the case of increasing casting speed the oscillation frequency is lowered by comparison with the usual linear rise in such a manner that
      a) initially the oscillation frequency rises with slower progression and
      b) subsequently it is set to approximately constant values.
    3. Method according to claim 2, characterised in that in the case of rising casting speed a relative dynamic progression of the oscillation frequency below the usual linear rise takes place in such a manner that the negative strip is prolonged by approximately 20%.
    4. Method according to one or more of claims 1 to 3, characterised in that a dynamically adapted oscillation stroke is set independently of the course of the reduced oscillation frequency in comparison to the casting speed.
    5. Method according to one or more of claims 1 to 4, characterised in that the chill mould oscillation is set in accordance with a form of oscillation curve deviating from the sine form, for example with relative speeds between chill mould and cast strip which are constant within limits.
    6. Method according to one or more of claims 1 to 5, characterised in that absolute negative or positive strip times are set by free preselection of stroke length or frequency independently of a linear relationship.
    7. Method according to one or more of claims 1 to 6, characterised in that a relative frequency lowering of the oscillation with desired oscillation forms, such as sinusoidal, trapezoidal or sawtooth oscillation forms, is undertaken.
    8. Method according to one or more of claims 1 to 7, characterised by the use of a hydraulic oscillator for variable setting of stroke and frequency of the chill mould oscillation.
    EP99958061A 1998-11-25 1999-11-17 Method for oscillating a continuous-casting mould by means of variable oscillation parameters Expired - Lifetime EP1133370B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19854329 1998-11-25
    DE19854329A DE19854329A1 (en) 1998-11-25 1998-11-25 Method for oscillating a continuous casting mold using variable oscillation parameters
    PCT/EP1999/008836 WO2000030783A1 (en) 1998-11-25 1999-11-17 Method for oscillating a continuous-casting mould by means of variable oscillation parameters

    Publications (2)

    Publication Number Publication Date
    EP1133370A1 EP1133370A1 (en) 2001-09-19
    EP1133370B1 true EP1133370B1 (en) 2002-09-04

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99958061A Expired - Lifetime EP1133370B1 (en) 1998-11-25 1999-11-17 Method for oscillating a continuous-casting mould by means of variable oscillation parameters

    Country Status (7)

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    EP (1) EP1133370B1 (en)
    KR (1) KR100634049B1 (en)
    AT (1) ATE223268T1 (en)
    DE (2) DE19854329A1 (en)
    ES (1) ES2183628T3 (en)
    MX (1) MXPA01005160A (en)
    WO (1) WO2000030783A1 (en)

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    KR101105905B1 (en) * 2004-12-27 2012-01-17 주식회사 포스코 Mothod for manufacturing of continued molded slabe of stainless of steel
    DE102017213647A1 (en) * 2017-03-29 2018-10-04 Sms Group Gmbh Continuous casting plant and method for its operation
    DE102018215566A1 (en) 2018-09-13 2020-03-19 Sms Group Gmbh Method and computer program product for operating an oscillation device and the corresponding oscillation device

    Family Cites Families (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE2002366B1 (en) * 1970-01-14 1971-01-21 Mannesmann Ag Sinusoidal mold movement during continuous casting
    US4577277A (en) * 1983-03-07 1986-03-18 Kabushiki Kaisha Kobe Seiko Sho Method and apparatus of continuous casting by the use of mold oscillating system
    DE3343479C1 (en) * 1983-12-01 1984-08-23 Fried. Krupp Gmbh, 4300 Essen Process for oscillating a rigid horizontal continuous casting mold for metals, especially steel
    DE3704793A1 (en) * 1987-02-16 1988-08-25 Thyssen Edelstahlwerke Ag LIFTING DEVICE ON A CONTINUOUS CASTILE
    ES2032609T3 (en) * 1988-01-28 1993-02-16 Clecim PROCEDURE AND DEVICE FOR THE OSCILLATION OF A CONTINUOUS STEEL CAST INGING MACHINE.
    FR2689045B1 (en) * 1992-03-31 1994-06-24 Clecim Sa CONTINUOUS CASTING PROCESS.
    EP0618023B1 (en) * 1992-09-22 1998-06-17 Kawasaki Steel Corporation casting continuous slab in oscillated mold with horizontally retractable walls

    Also Published As

    Publication number Publication date
    ATE223268T1 (en) 2002-09-15
    MXPA01005160A (en) 2005-06-20
    KR20010080508A (en) 2001-08-22
    WO2000030783A1 (en) 2000-06-02
    DE59902597D1 (en) 2002-10-10
    KR100634049B1 (en) 2006-10-16
    ES2183628T3 (en) 2003-03-16
    EP1133370A1 (en) 2001-09-19
    DE19854329A1 (en) 2000-05-31

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