EP1095720A1 - Frame for strand guiding in a continuous casting machine, particularly for thin steel slabs - Google Patents

Frame for strand guiding in a continuous casting machine, particularly for thin steel slabs Download PDF

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Publication number
EP1095720A1
EP1095720A1 EP00121982A EP00121982A EP1095720A1 EP 1095720 A1 EP1095720 A1 EP 1095720A1 EP 00121982 A EP00121982 A EP 00121982A EP 00121982 A EP00121982 A EP 00121982A EP 1095720 A1 EP1095720 A1 EP 1095720A1
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EP
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Prior art keywords
segment
strand
phase shift
rollers
roller
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EP00121982A
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German (de)
French (fr)
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EP1095720B1 (en
Inventor
Erich Dr.-Ing. Hövestädt
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SMS Siemag AG
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SMS Demag 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing

Definitions

  • the invention relates to a strand guide frame having a stationary mold Continuous caster, especially for thin slabs made of steel, with the Corresponding strand width corresponding rows of segments with a roller pitch arranged rollers for guiding and driving the Liquid metal filled strand.
  • the individual rolls arranged in segments are usually constant Distances to each other in the respective scaffolding. This distance is basically dependent on the roll thickness and the requirement between the rollers elements for applying splash water to cool the To provide slabs.
  • Regularly are those in the upper and lower frame of the individual guide frames arranged roles directly as pairs of roles arranged. In normal operation, the division of roles corresponds to a half phase (180 degrees) of the vibration of the liquid metal.
  • EP 0 041 498 A2 has disclosed a continuous sheet caster with one below the mold guide arranged, the two opposite one another Has roller conveyors, the rollers of which are mounted on scaffolding parts, the Distance between opposing scaffolding parts and thus the distance between the Roller conveyors can be changed according to a strand cross-section to be set is, and wherein the rollers at least one of the roller tracks on the frame part in Longitudinal direction of this roller conveyor is arranged displaceably and on the scaffold part in different Layers are fixable.
  • the aim of the subject of this document is to convert for the purpose of adjustment the distance between the opposing roller conveyors the desired strand thickness so that the distance of the Final rolling of adjacent scaffolding parts remains approximately the same and the retrofitting of the system can be carried out in a simple manner and without great effort.
  • a strand guide frame is known from document JP 57-209759, where the roles of the upper frame to those of the lower frame in each case Gap are arranged, the asymmetrical arrangement of at least one part of the opposite rows result to even out the shape of the swamp.
  • a method and a corresponding device are known from document WO 98/20998 for continuous casting of thin slabs with casting speeds greater 3m / min. known in a continuous caster, in which after leaving the mold Strand shell corresponding to each broad side of the slab during its plastic behavior the division of roles of the supporting guide roles into a stationary one Waveform is molded.
  • the strand shell box during its elastic behavior, according to the assignment of the opposite arranged guide rollers, an unsteady undulating surface shape embossed and after metrological recording of the transition from plastic on elastic behavior in the area of elastic behavior of the Strand tray box, the slab is supported in such a way that it is minimal Force is exerted on the strand shell through the strand guide.
  • the disadvantage of the subject of this document is the imprinting of a waveform of the strand, which has no further influence on the strand shell the guide scaffold is meandered.
  • this design has the disadvantage that the individual Segments are structured differently and are therefore not interchanged can be.
  • the transition area changes from plastic its in the elastic range for different casting speeds Position so that the casting speed for a casting sequence can only be changed to a limited extent.
  • Strand guiding structures which essentially aim at minimizing bulging (Bulging) aligned structural properties of the strand shell of individual rolls and roll spacings can be used in modern Plant driven speeds represent a sound box that excites the liquid column to a resonance vibration. With such from the construction of the strand guide scaffold fluctuations There is a disruption in the mold meniscus. This disorder leads to changes Strand shell thicknesses in the mold. Wander these changed strand shell thicknesses in the area of the strand guide rollers, the amount changes of the "bulging" at this point and there is a change in volume of the Strand shell and thus to a "pumping" in the area of the mold level, and in the frequency of the roller spacing. This can lead to another malfunction the formation of strand shells and thereby to a permanent oscillation of the Pouring mirror come.
  • the invention has for its object with simple design measures to create a strand guide structure in which a rocking of the mold level is avoided in the stationary mold.
  • the oppositely arranged rollers of the respective rows of the individual segments of a strand guide frame of a continuous caster, in particular for thin slabs made of steel, are spaced from one another in such a way that they cause a phase shift in relation to a sinusoidal oscillation with the wavelength for an unsteady bulging of the strand which moves at the casting speed I R have.
  • the change in the roller spacing can occur during the roller shift ⁇ I take both positive and negative values.
  • the inventor shows one Way to design the role plan so that irregularities compensate.
  • the phase shift ⁇ is greater than 30 °.
  • the phase shift is between two adjacent pairs of rollers at least 5 °, based on the average roller spacing of the segment.
  • the individual segments are divided into areas the individual areas have increasing or decreasing roller spacings.
  • FIG. 1 shows two arranged rollers 31, 32 of an upper frame of a segment and the rollers 11, 12 of a subframe of a segment. Between a continuous casting slab B is guided to the rollers, which is a liquid sump F has enveloping strand shell S. The strand shell S widens between the opposite arranged rollers 11, 31 and 12, 32 as a result of the ferrostatic Pressure of the sump F consisting of liquid metal. This bulging is called bulging.
  • FIG. 2 shows only the roller arrangement of the lower frame of the strand guide frames.
  • two segments 1, 2 are shown with the rollers 11 to 18 and 21 to 28.
  • the segment 1 has a constant distance, namely 180 mm here, and the segment 2 alternating roller distances, namely 180 mm and 185 mm.
  • FIG. 3 shows the subframe of a single segment with the rollers 11 to 18.
  • this segment there are six constant roller distances, namely 180 mm, and a roller distance is 190 mm.

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

Abstract

Opposite rollers (11, 31; 12, 32) in respective rows of at least one segment are spaced such that, in the unsteady state with bulges of the strand moving at the casting speed, they exhibit a phase shift with respect to a sinusoidal oscillation with wavelength (IR). This phase shift is given by : DELTA phi = ( DELTA I/IR) x 2 pi . Where: MOD( DELTA phi ) = 20 deg -90 deg , DELTA I = variation of the basic roller spacing IR, IR = Actual spacing of two rollers in a row, with Ir = VG/f, VG = casing speed, f = VG/IR = frequency of bulging in cast strand shell encasing liquid metal.

Description

Die Erfindung betrifft ein Strangführungsgerüst einer eine stationäre Kokille aufweisenden Stranggießanlage, insbesondere für Dünnbrammen aus Stahl, mit der Strangdicke entsprechenden lichte Weite aufweisenden Reihen von in Segmenten mit einer Rollenteilung angeordneten Rollen zum Führen und Treiben des mit Flüssigmetall gefüllten Stranges.The invention relates to a strand guide frame having a stationary mold Continuous caster, especially for thin slabs made of steel, with the Corresponding strand width corresponding rows of segments with a roller pitch arranged rollers for guiding and driving the Liquid metal filled strand.

Üblicherweise sind die einzelnen in Segmenten angeordneten Rollen mit konstanten Abständen zueinander in den jeweiligen Gerüsten angeordnet. Dieser Abstand ist dabei grundsätzlich abhängig von der Rollendicke und dem Erfordernis, zwischen den Rollen Elemente zum Aufbringen von Spritzwasser zur Kühlung der Brammen vorzusehen. Regelmäßig sind dabei die im Ober- und Unterrahmen der einzelnen Führungsgerüste angeordneten Rollen als Rollenpaare unmittelbar gegenüber angeordnet. Im Normalbetrieb entspricht die Rollenteilung einer Halbphase (180 Grad) der Schwingung des Flüssigmetalls.The individual rolls arranged in segments are usually constant Distances to each other in the respective scaffolding. This distance is basically dependent on the roll thickness and the requirement between the rollers elements for applying splash water to cool the To provide slabs. Regularly are those in the upper and lower frame of the individual guide frames arranged roles directly as pairs of roles arranged. In normal operation, the division of roles corresponds to a half phase (180 degrees) of the vibration of the liquid metal.

Es sind aber auch Stranggießanlagen bekannt, die eine hiervon sich unterscheidende Konstruktion aufweisen. However, continuous casting plants are also known which differ from this Have construction.

So ist aus EP 0 041 498 A2 eine Bogenstranggießanlage bekannt mit einer unterhalb der Kokille angeordneten Strangführung, die zwei einander gegenüberliegende Rollenbahnen aufweist, deren Rollen an Gerüstteilen montiert sind, wobei der Abstand einander gegenüberliegender Gerüstteile und damit der Abstand der Rollenbahnen entsprechend einem einzustellenden Strangquerschnitt veränderbar ist, und wobei die Rollen mindestens einer der Rollenbahnen am Gerüstteil in Längsrichtung dieser Rollenbahn versetzbar angeordnet und am Gerüstteil in unterschiedlichen Lagen fixierbar sind.For example, EP 0 041 498 A2 has disclosed a continuous sheet caster with one below the mold guide arranged, the two opposite one another Has roller conveyors, the rollers of which are mounted on scaffolding parts, the Distance between opposing scaffolding parts and thus the distance between the Roller conveyors can be changed according to a strand cross-section to be set is, and wherein the rollers at least one of the roller tracks on the frame part in Longitudinal direction of this roller conveyor is arranged displaceably and on the scaffold part in different Layers are fixable.

Ziel des Gegenstandes dieses Dokumentes ist es, ein Umrüsten zwecks Verstellung des Abstandes der einander gegenüberliegenden Rollenbahnen entsprechend der gewünschten Strangdicke derart zu ermöglichen, daß der Abstand der Endrollen benachbarter Gerüstteile etwa gleich bleibt und das Umrüsten der Anlage in einfacher Weise und ohne großen Aufwand durchführbar ist.The aim of the subject of this document is to convert for the purpose of adjustment the distance between the opposing roller conveyors the desired strand thickness so that the distance of the Final rolling of adjacent scaffolding parts remains approximately the same and the retrofitting of the system can be carried out in a simple manner and without great effort.

Weiterhin ist aus dem Dokument JP 57-209759 ein Strangführungsgerüst bekannt, bei dem die Rollen des Obergerüstes zu den des Untergerüstes jeweils in der Lücke angeordnet sind, die eine asymmetrische Anordnung zumindest eines Teils der sich gegenüberliegenden Reihen ergeben,um die Form des Sumpfes zu vergleichmäßigen.Furthermore, a strand guide frame is known from document JP 57-209759, where the roles of the upper frame to those of the lower frame in each case Gap are arranged, the asymmetrical arrangement of at least one part of the opposite rows result to even out the shape of the swamp.

Aus dem Dokument WO 98/20998 ist ein Verfahren und eine entsprechende Vorrichtung zum Stranggießen von Dünnbrammen mit Gießgeschwindigkeiten größer 3m/min. in einer Stranggießanlage bekannt, bei der nach Verlassen der Kokille die Strangschale jeder Brammenbreitseite während ihres plastischen Verhaltens entsprechend der Rollenteilung der stützenden Führungsrollen in eine stationäre Wellenform eingeformt wird. Nachfolgend wird dem Strangschalenkasten während seines elastischen Verhaltens, entsprechend der Zuordnung der gegenüberliegend angeordneten Führungsrollen, eine instationäre wellenförmige Oberflächenform eingeprägt und nach meßtechnischer Erfassung des Übergangs vom plastischen zum elastischen Verhalten im Bereich des elastischen Verhaltens des Strangschalenkastens wird die Bramme in der Weise gestützt, daß sie bei minimaler Krafteinwirkung auf die Strangschale durch die Strangführung geführt wird.A method and a corresponding device are known from document WO 98/20998 for continuous casting of thin slabs with casting speeds greater 3m / min. known in a continuous caster, in which after leaving the mold Strand shell corresponding to each broad side of the slab during its plastic behavior the division of roles of the supporting guide roles into a stationary one Waveform is molded. Below is the strand shell box during its elastic behavior, according to the assignment of the opposite arranged guide rollers, an unsteady undulating surface shape embossed and after metrological recording of the transition from plastic on elastic behavior in the area of elastic behavior of the Strand tray box, the slab is supported in such a way that it is minimal Force is exerted on the strand shell through the strand guide.

Nachteil des Gegenstandes dieses Dokumentes ist die Einprägung einer Wellenform des Stranges, der ohne weitere Einflußnahme auf die Strangschale durch das Führungsgerüst geschlängelt wird.The disadvantage of the subject of this document is the imprinting of a waveform of the strand, which has no further influence on the strand shell the guide scaffold is meandered.

Darüber hinaus hat diese konstruktive Ausgestaltung den Nachteil, daß die einzelnen Segmente unterschiedlich aufgebaut sind und somit untereinander nicht ausgetauscht werden können. Außerdem ändert der Übergangsbereich vom plastischen in den elastischen Bereich für unterschiedliche Gießgeschwindigkeiten seine Lage, so daß bei gegebener Segmentkonfiguration die Gießgeschwindigkeit für eine Gießsequenz nur eingeschränkt verändert werden kann.In addition, this design has the disadvantage that the individual Segments are structured differently and are therefore not interchanged can be. In addition, the transition area changes from plastic its in the elastic range for different casting speeds Position so that the casting speed for a casting sequence can only be changed to a limited extent.

Strangführungsgerüste, die im wesentlichen auf eine Minimierung des Ausbauchens (Bulging) der Strangschale ausgerichtete konstruktive Eigenschaften der einzelnen Rollen und Rollenabstände aufweisen, können bei in den modernen Anlagen gefahrenen Gießgeschwindigkeiten einen Resonanzkörper darstellen, der die Flüssigsäule zu einer Resonanzschwingung anregt. Bei solchen von der Konstruktion des Strangführungsgerüstes abhängigen Gießspiegelschwankungen kommt es im Meniskus der Kokille zu einer Störung. Diese Störung führt zu veränderten Strangschalendicken in der Kokille. Wandern diese veränderten Strangschalendicken in den Bereich der Strangführungsrollen, so verändert sich der Betrag des "Bulgings" an dieser Stelle und es kommt zu einer Volumenänderung der Strangschale und somit zu einem "Pumpen" im Bereich des Gießspiegels, und zwar in der Frequenz der Rollenabstände. Dies kann zu einer erneuten Störung der Strangschalenbildung und dadurch zu einem permanenten Oszillieren des Gießspiegels kommen. Strand guiding structures, which essentially aim at minimizing bulging (Bulging) aligned structural properties of the strand shell of individual rolls and roll spacings can be used in modern Plant driven speeds represent a sound box that excites the liquid column to a resonance vibration. With such from the construction of the strand guide scaffold fluctuations There is a disruption in the mold meniscus. This disorder leads to changes Strand shell thicknesses in the mold. Wander these changed strand shell thicknesses in the area of the strand guide rollers, the amount changes of the "bulging" at this point and there is a change in volume of the Strand shell and thus to a "pumping" in the area of the mold level, and in the frequency of the roller spacing. This can lead to another malfunction the formation of strand shells and thereby to a permanent oscillation of the Pouring mirror come.

Der Erfindung liegt die Aufgabe zugrunde, mit einfachen konstruktiven Maßnahmen ein Strangführungsgerüst zu schaffen, bei dem ein Aufschaukeln des Gießspiegels in der stationären Kokille vermieden wird.The invention has for its object with simple design measures to create a strand guide structure in which a rocking of the mold level is avoided in the stationary mold.

Erfindungsgemäß sind die gegenüberliegend angeordneten Rollen der jeweiligen Reihen der einzelnen Segmente eines Strangführungsgerüstes einer Stranggießanlage, insbesondere für Dünnbrammen aus Stahl, in der Weise voneinander beabstandet, daß sie für eine instationäre, sich mit Gießgeschwindigkeit bewegende Ausbauchung des Stranges eine Phasenverschiebung gegenüber einer Sinusschwingung mit der Wellenlänge IR aufweisen.According to the invention, the oppositely arranged rollers of the respective rows of the individual segments of a strand guide frame of a continuous caster, in particular for thin slabs made of steel, are spaced from one another in such a way that they cause a phase shift in relation to a sinusoidal oscillation with the wavelength for an unsteady bulging of the strand which moves at the casting speed I R have.

Entsprechend dem Rollenplan stellt sich bei einer Stranggießanlage eine definierte Frequenz ein. Ausgehend von einem Rollenplan mit n Rollen und n-1 konstanten Rollenabständen IR, in dem Bereich der Gießmaschine, in der der Strang nicht durcherstarrt ist, ergibt sich eine Frequenz f, mit der eine stranggebundene Ungleichförmigkeit, die mit der Strangschale transportiert wird und zur periodischen Ausbauchung, d.h. zur periodischen Änderung des Füllstandes (Gießspiegels) in der Kokille führt, gemäß dem Ansatz f = vG/IR

  • mit f = Frequenz, mit der die Störung auftritt
  • IR = (Basis-) Rollenabstand
  • vG = Gießgeschwindigkeit.
    • According to the role plan, a defined frequency is set in a continuous caster. Starting from a roll plan with n rolls and n-1 constant roll spacings I R , in the area of the casting machine in which the strand is not solidified, a frequency f results with which a strand-bound non-uniformity is transported with the strand shell and to periodic bulging, ie leads to the periodic change of the fill level (casting level) in the mold, according to the approach f = v G / I R
  • with f = frequency with which the disturbance occurs
  • I R = (basic) roller spacing
  • v G = casting speed.

    • In Kenntnis der Frequenz der Stranggießanlage wird erfindungsgemäß bei der Einführung einer 1-nten Rolle mit einem Rollenabstand von IR + ΔI, und bei Ansatz einer sinusförmigen Änderung des Gießspiegels durch eine Ungleichförmigkeit der Strangschale bei Durchlaufen der Rollenabstände mit n-1, eine näherungsweise sinusförmigen Änderung des Füllstandes der Kokille mit der Phasenverschiebung

    Δϕ =
    (ΔI/IR) x 2π gegenüber den vorhergehenden Störungen im Gießspiegel auftreten.
    mit ΔI =
    Änderung des (Basis-) Rollenabstandes und
    Aϕ =
    Phasenverschiebung gegenüber einer Sinusschwingung mit Wellenlänge IR.
    Knowing the frequency of the continuous caster, according to the invention, when introducing a 1-th roller with a roller spacing of I R + ΔI, and when a sinusoidal change in the casting level is assumed due to a non-uniformity of the strand shell when the roller spacings are run through with n-1, an approximately sinusoidal one Changing the level of the mold with the phase shift
    Δϕ =
    (ΔI / I R ) x 2π compared to the previous disturbances in the mold level.
    with ΔI =
    Change of the (basic) roller spacing and
    Aϕ =
    Phase shift compared to a sine wave with wavelength I R.

    Erfindungsgemäß kann bei der Rollenverschiebung die Änderung des Rollenabstandes ΔI sowohl positive, als auch negative Werte annehmen.According to the invention, the change in the roller spacing can occur during the roller shift ΔI take both positive and negative values.

    Gießspiegelschwankungen, die durch die oben beschriebenen Frequenzen zur stranggebundenen Ausbauchung an vielen Stellen zwischen den Rollen gleichzeitig auftreten, hierbei zu starken Gießspiegelschwankungen führen, die den Gießbetrieb beeinträchtigen können, werden durch die erfindungsgemäßen mehreren Phasenverschiebungen durch Veränderung eines Rollenabstandes bzw. durch Änderung von Gruppen von Rollenabständen behoben, so daß durch Überlagerungen phasenverschobener Wirkungen auf den Gießspiegel die negativen Auswirkungen für den Gießprozeß unterbunden werden. Der Erfinder zeigt einen Weg, den Rollenplan so zu gestalten, daß sich Unregelmäßigkeiten kompensieren.Casting level fluctuations caused by the frequencies described above strand-bound bulge in many places between the rollers at the same time occur, this can lead to strong mold level fluctuations, which the casting operation can be impaired by the several of the invention Phase shifts by changing a roller spacing or by Change of groups of roller spacing fixed so that by overlays phase-shifted effects on the mold level the negative effects be prevented for the casting process. The inventor shows one Way to design the role plan so that irregularities compensate.

    In einer vorteilhaften Ausgestaltung ist die Phasenverschiebung Δϕ größer 30°.In an advantageous embodiment, the phase shift Δϕ is greater than 30 °.

    In einer besonderen Ausgestaltung beträgt die Phasenverschiebung zwischen zwei benachbarten Rollenpaaren mindestens 5°, bezogen auf den mittleren Rollenabstand des Segmentes.In a special embodiment, the phase shift is between two adjacent pairs of rollers at least 5 °, based on the average roller spacing of the segment.

    In einer anderen Ausgestaltung sind die einzelnen Segmente in Bereiche unterteilt, wobei die einzelnen Bereiche steigende oder fallende Rollenabstände besitzen. In another embodiment, the individual segments are divided into areas the individual areas have increasing or decreasing roller spacings.

    Weiter wird vorgeschlagen, zwei bis fünf Segmente zu einem Multi-Rollen-Segment zusammenzufassen.It is also proposed that two to five segments form a multi-role segment summarize.

    Ein Beispiel der Erfindung ist in den beigefügten Zeichnungen dargelegt. Dabei zeigen

    Figur 1
    Schematisch ein durch die Rollen geführten Metallstrang.
    Figur 2
    Anordnung der Rollen in den Untergerüsten von zwei Segmenten.
    Figur 3
    Anordnung der Rollen eines Untergerüstes in einem Segment.
    An example of the invention is set forth in the accompanying drawings. Show
    Figure 1
    Schematically a metal strand led through the rollers.
    Figure 2
    Arrangement of the roles in the sub-frames of two segments.
    Figure 3
    Arrangement of the roles of a sub-frame in a segment.

    Die Figur 1 zeigt zwei angeordnete Rollen 31, 32 eines Oberrahmens eines Segmentes und die Rollen 11, 12 eines Unterrahmens eines Segmentes. Zwischen den Rollen ist eine Stranggießbramme B geführt, die eine den flüssigen Sumpf F umhüllende Strangschale S aufweist. Die Strangschale S weitet sich zwischen den gegenüber angeordneten Rollen 11, 31 bzw. 12, 32 in Folge des ferrostatischen Druckes des aus flüssigem Metall bestehenden Sumpfes F aus. Dieses Ausbauchen wird Bulging genannt.FIG. 1 shows two arranged rollers 31, 32 of an upper frame of a segment and the rollers 11, 12 of a subframe of a segment. Between a continuous casting slab B is guided to the rollers, which is a liquid sump F has enveloping strand shell S. The strand shell S widens between the opposite arranged rollers 11, 31 and 12, 32 as a result of the ferrostatic Pressure of the sump F consisting of liquid metal. This bulging is called bulging.

    In der Figur 1 ist zu sehen, daß die Rollen des jeweiligen Unter- bzw. Oberrahmens einen konstanten Abstand IR besitzen. Dieser Abstand ist um ΔI sowohl in positiver als auch in negativer Weise bezüglich des konstanten Rollenabstandes IR verschiebbar.In Figure 1 it can be seen that the roles of the respective lower or upper frame have a constant distance I R. This distance can be shifted by ΔI both in a positive and in a negative manner with respect to the constant roller distance I R.

    In der Figur 2 ist zur Vereinfachung nur die Rollenanordnung des Unterrahmens der Strangführungsgerüste aufgezeigt. In der vorliegenden Figur sind zwei Segmente 1, 2 aufgezeigt mit den Rollen 11 bis 18 und 21 bis 28. Bei diesen zwei nacheinander angeordneten Segmenten besitzt das Segment 1 einen konstanten Abstand, und zwar hier 180 mm, und das Segment 2 wechselnde Rollenabstände, nämlich 180 mm und 185 mm. Hierdurch wird insgesamt die Phasenverschiebung Δϕ = 4x(185mm - 180mm)180mm x 360° = 40° erzeugt.For the sake of simplicity, FIG. 2 shows only the roller arrangement of the lower frame of the strand guide frames. In the present figure, two segments 1, 2 are shown with the rollers 11 to 18 and 21 to 28. In these two segments arranged one after the other, the segment 1 has a constant distance, namely 180 mm here, and the segment 2 alternating roller distances, namely 180 mm and 185 mm. As a result, the overall phase shift Δϕ = 4x (185mm - 180mm) 180mm x 360 ° = 40 ° generated.

    In der Figur 3 ist der Unterrahmen eines einzelnen Segmentes aufgeführt mit den Rollen 11 bis 18. Bei diesem Segment liegen sechs konstante Rollenabstände vor, und zwar 180 mm, und ein Rollenabstand beträgt 190 mm. Der mittlere Rollenabstand beträgt demnach 181,43 mm, so daß sich die Phasenverschiebung von Δϕ = (190mm - 181,43mm)181,43mm x 360° = 17° ergibt. FIG. 3 shows the subframe of a single segment with the rollers 11 to 18. In this segment there are six constant roller distances, namely 180 mm, and a roller distance is 190 mm. The mean roller distance is therefore 181.43 mm, so that the phase shift of Δϕ = (190mm - 181.43mm) 181.43mm x 360 ° = 17 ° results.

    PositionalistePosition list StrangführungStrand guide

    11-1811-18
    Rolle im Untergerüst 1. SegmentRole in the lower frame 1st segment
    21-2821-28
    Rolle im Unterrahmen 2. SegmentRole in subframe 2nd segment
    31-3231-32
    Rolle im Oberrahmen 1. SegmentRole in the upper frame 1st segment
    BB
    BrammeSlab
    SS
    StrangschaleStrand shell
    FF
    Flüssigmetall/SumpfLiquid metal / sump

    Claims (8)

    Strangführungsgerüst einer eine stationäre Kokille aufweisenden Stranggießanlage, insbesondere für Dünnbrammen aus Stahl, mit der Strangdicke entsprechenden lichte Weite aufweisenden Reihen von in Segmenten (1, 2) mit einer Rollenteilung (IR) angeordneten Rollen (11 - 18; 21 - 28) zum Führen und Treiben des mit Flüssigmetall gefüllten Stranges,
    dadurch gekennzeichnet, daß die gegenüberliegend angeordneten Rollen (11, 31; 12, 32) der jeweiligen Reihen mindestens eines Segmentes solche Abstände besitzen, daß sie für eine instationäre, sich mit Gießgeschwindigkeit bewegende Ausbauchung des Stranges eine Phasenverschiebung (Δϕ) gegenüber einer Sinusschwingung mit der Wellenlänge (IR) aufweisen entsprechend dem Ansatz: Δϕ = (AI/IR) x 2π mit |Δϕ| = 20° bis 90°, wobei ΔI = Änderung des Basisrollenabstandes IR IR = Istabstand zweier Rollen einer Reihe (Rollenteilung) bei IR = vG/f vG = Gießgeschwindigkeit f = vG/IR = Frequenz des von der Strangschale umhüllten Flüssigmetalls be deuted.     Strip guide stand of a stationary mold having continuous casting plant, particularly for thin slabs of steel, corresponding with the strip thickness clearance having rows arranged in segments (1, 2) with a roller pitch (I R) of rollers (11-18; 21-28) for guiding and driving the strand filled with liquid metal,
    characterized, that the oppositely arranged rollers (11, 31; 12, 32) of the respective rows of at least one segment are spaced such that they have a phase shift (Δϕ) relative to a sinusoidal oscillation with the wavelength (I.) for an unsteady bulging of the strand moving at the casting speed R ) have according to the approach: Δϕ = (AI / I R ) x 2π with | Δϕ | = 20 ° to 90 °, where ΔI = change in the base roller spacing I R I R = actual distance between two rollers in a row (roller division) at I. R = v G / f v G = casting speed f = v G / I R = Frequency of the liquid metal enveloped by the strand shell ,     Strangführungsgerüst nach Anspruch 1,
    dadurch gekennzeichnet, daß die Phasenverschiebung (Δϕ) über die Wahl der Rollenabstände in einem nachfolgenden Segment durch einen größeren oder kleineren mittleren Rollenabstand derart vergrößert bzw. verkleinert wird, daß die am Ausgang des nachfolgenden Segmentes vorliegende Phasenverschiebung mindestens 30° gegenüber dem vorangegangenen Segment beträgt.     Strand guide frame according to claim 1,
    characterized, that the phase shift (Δϕ) on the choice of roller spacing in a subsequent segment is increased or decreased by a larger or smaller average roller spacing such that the phase shift present at the exit of the following segment is at least 30 ° with respect to the previous segment.     Strangführungsgerüst nach den Ansprüchen 1 oder 2,
    dadurch gekennzeichnet, daß die Phasenverschiebung (Δϕ) zwischen zwei benachbarten Rollenpaaren (11, 31; 12, 32) mindestens 5° beträgt, bezogen auf den mittleren Rollenabstand des Segmentes.     Strand guide frame according to claims 1 or 2,
    characterized, that the phase shift (Δϕ) between two adjacent pairs of rollers (11, 31; 12, 32) is at least 5 °, based on the average roller spacing of the segment.     Strangführungsgerüst nach Anspruch 3,
    dadurch gekennzeichnet, daß die Segmente (1, 2) in Bereiche aufgeteilt sind, die steigende oder fallende Rollenabstände besitzen.     Strand guide frame according to claim 3,
    characterized, that the segments (1, 2) are divided into areas that have increasing or decreasing roller spacings.     Strangführungsgerüst nach Anspruch 4,
    dadurch gekennzeichnet, daß innerhalb eines Segmentes (1 bzw. 2) Bereiche mit steigendem Rollenabstand und Bereiche mit fallendem Rollenabstand vorgesehen sind.     Strand guide frame according to claim 4,
    characterized, that within a segment (1 or 2) areas with increasing roller spacing and areas with decreasing roller spacing are provided.     Strangführungsgerüst nach Anspruch 1,
    dadurch gekennzeichnet, daß die Phasenverschiebung (Δϕ) zwischen dem Gießspiegel des Flüssigmetalls in der stationären Kokille und dem ersten Rollenpaar der einzelnen Segmente Δϕ = 180° ± 90° beträgt, bezogen auf den mittleren Rollenabstand des jeweiligen Segmentes.     Strand guide frame according to claim 1,
    characterized, that the phase shift (Δϕ) between the casting level of the liquid metal in the stationary mold and the first pair of rollers of the individual segments is Δϕ = 180 ° ± 90 °, based on the average roller spacing of the respective segment.     Strangführungsgerüst nach einem der o.g. Ansprüche,
    dadurch gekennzeichnet, daß die Phasenverschiebung (Δϕ) eines nachfolgenden Segmentes gegenüber dem vorherigen Segment um einen mittleren konstanten Rollenabstand derart vergrößert wird, daß die Phasenverschiebung (Δϕ) am Ausgang des nachfolgenden Segmentes um mindestens 60° größer ist als am Ausgang des vorhergehenden Segmentes bezogen auf dessen konstanten Rollenabstand.     Strand guide frame according to one of the above claims,
    characterized, that the phase shift (Δϕ) of a subsequent segment compared to the previous segment is increased by an average constant roller spacing in such a way that the phase shift (Δϕ) at the exit of the following segment is at least 60 ° greater than at the exit of the previous segment based on its constant roller spacing .     Strangführungsgerüst nach einem der o.g. Ansprüche,
    dadurch gekennzeichnet, daß zwei bis fünf Segemente zu einem Multi-Rollen-Segment zusammengefaßt werden.     Strand guide frame according to one of the above claims,
    characterized, that two to five segments are combined to form a multi-role segment.
    EP00121982A 1999-10-25 2000-10-10 Frame for strand guiding in a continuous casting machine, particularly for thin steel slabs Expired - Lifetime EP1095720B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19951262 1999-10-25
    DE19951262A DE19951262C1 (en) 1999-10-25 1999-10-25 Strand guidance roller frame used in continuous casting of thin steel slab from static mold, has adjustable roller spacing, to de-tune undesirable oscillations causing strand bulging

    Publications (2)

    Publication Number Publication Date
    EP1095720A1 true EP1095720A1 (en) 2001-05-02
    EP1095720B1 EP1095720B1 (en) 2004-08-11

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    ID=7926739

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    Application Number Title Priority Date Filing Date
    EP00121982A Expired - Lifetime EP1095720B1 (en) 1999-10-25 2000-10-10 Frame for strand guiding in a continuous casting machine, particularly for thin steel slabs

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    Country Link
    EP (1) EP1095720B1 (en)
    AT (1) ATE273094T1 (en)
    DE (2) DE19951262C1 (en)

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    DE102009011849A1 (en) 2009-03-05 2010-09-09 Sms Siemag Aktiengesellschaft Device for continuous casting of steel, comprises a continuous casting mold and a supply container for the supply of metal melt to the casting mold, where the supply container and the casting mold are arranged next to each other
    AT519390A1 (en) * 2016-12-13 2018-06-15 Primetals Technologies Austria GmbH Method and device for controlling a continuous casting plant
    EP3539690A1 (en) * 2018-03-12 2019-09-18 SMS Group GmbH Process to avoid mould level fluctuations during a casting sequence

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    DE102006018757A1 (en) * 2006-04-22 2007-10-25 Sms Demag Ag Method for determining the roll spacings of support rollers and strand guide framework of a continuous casting plant for casting liquid metals, in particular liquid steel materials
    KR101736574B1 (en) * 2015-06-04 2017-05-17 주식회사 포스코 Solidifying apparatus

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    Publication number Priority date Publication date Assignee Title
    DE102009011849A1 (en) 2009-03-05 2010-09-09 Sms Siemag Aktiengesellschaft Device for continuous casting of steel, comprises a continuous casting mold and a supply container for the supply of metal melt to the casting mold, where the supply container and the casting mold are arranged next to each other
    AT519390A1 (en) * 2016-12-13 2018-06-15 Primetals Technologies Austria GmbH Method and device for controlling a continuous casting plant
    AT519390B1 (en) * 2016-12-13 2020-09-15 Primetals Technologies Austria GmbH Method and device for controlling a continuous caster
    US11110512B2 (en) 2016-12-13 2021-09-07 Primetals Technologies Austria GmbH Method and device for regulating a continuous casting machine
    EP3539690A1 (en) * 2018-03-12 2019-09-18 SMS Group GmbH Process to avoid mould level fluctuations during a casting sequence

    Also Published As

    Publication number Publication date
    ATE273094T1 (en) 2004-08-15
    DE19951262C1 (en) 2001-04-05
    DE50007358D1 (en) 2004-09-16
    EP1095720B1 (en) 2004-08-11

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