EP1957220B1 - Procede de fonctionnement d'une machine de coulee a deux cylindres pour la coulee de metaux en fusion en bande coulee - Google Patents

Procede de fonctionnement d'une machine de coulee a deux cylindres pour la coulee de metaux en fusion en bande coulee Download PDF

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Publication number
EP1957220B1
EP1957220B1 EP06819633A EP06819633A EP1957220B1 EP 1957220 B1 EP1957220 B1 EP 1957220B1 EP 06819633 A EP06819633 A EP 06819633A EP 06819633 A EP06819633 A EP 06819633A EP 1957220 B1 EP1957220 B1 EP 1957220B1
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EP
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Prior art keywords
casting
side plates
gap
cast strip
strip
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Not-in-force
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EP06819633A
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German (de)
English (en)
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EP1957220A1 (fr
Inventor
André D'HONE
René LEENEN
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Outokumpu Nirosta GmbH
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ThyssenKrupp Nirosta GmbH
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams
    • 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

Definitions

  • the invention relates to a method for operating a Zweiwalzeng tellmaschine for casting molten metal, in particular molten steel, to cast strip, the two casting rolls, which are driven in opposite directions about an axis of rotation and define between them a casting gap on the longitudinal sides, and deliverable to the casting rolls
  • Side plates which seal the casting gap on its narrow sides in the casting operation by bridging the casting gap with a refractory material on the end faces of the casting rolls, wherein the side plates are moved during the casting operation in the vertical direction, which is aligned parallel to the conveying direction, in which cast strip leaves the casting gap, wherein arise in the refractory material of the side plates with increasing operating time gap-like recesses.
  • the melting space at the end faces of the casting rolls is usually sealed with side plates which carry a ceramic insert forming the actual seal.
  • This ceramic is moved axially during the casting process in the direction of the casting rolls, on the one hand to compensate for the resulting by the abrasion of the casting rolls removal of the ceramic material and on the other the wear of the insert, due to abrasion by the in the casting gap forming band edge and chemical reaction is caused.
  • the width and depth of the grooves increase in the direction of the narrowest region of the casting gap, against which the metal shells solidified on the casting rolls are pressed against one another.
  • the gap-like recesses can work into the areas of the insert ceramic lying between the end faces of the casting rolls and their associated contact surfaces of the inserts.
  • the thus enlarged gap-like recesses then have a T-shaped cross-section.
  • T-slot-like recesses urgent melt can solidify at the faces of the casting rolls.
  • the solidified pieces of melts in technical language also called "T-edges" are entrained by the casting rolls and can cause such significant disturbances of the casting operation or the casting result.
  • the emergence of grooves can be counteracted by the fact that the side plates with their inserts after reaching a stationary casting process in a first time interval in the axial direction of the casting rolls against the end faces of the casting rolls and then moved in a second time interval in a direction which is parallel to the conveying direction, with which the cast strip leaves the casting gap.
  • the first time interval of the axial movement may overlap the second time interval of the movement taking place parallel to the conveying direction of the belt at least temporarily.
  • the first time interval should be used before the second one begins, to ensure proper grinding of the side plate inserts.
  • the feed, with which the side plates are moved with their inserts in the conveying direction of the cast strip is in the range of 50 mm per hour, preferably in the range of 1 mm to 30 mm per hour casting time.
  • a correspondingly insufficient positioning of the lower edge of the insert can be further caused by unfavorable process parameters, which trigger a shift of the kissing point under the lower edge of the insert.
  • the object of the invention to provide a method in which suppresses the emergence of the casting result and the casting disturbing grooves with increased safety and the life of the side plates and the security, with a stable Casting can be maintained, compared to the prior art is increased.
  • the side plates are adjusted with their insert from G manbeginn taking into account each cast length of the cast strip.
  • each cast directly dependent on the respective casting speed strip length is taken into account in the adjustment of the side plates each produced strip thickness and thus the conditions prevailing in the casting gap conditions. In this way, irrespective of the thickness of the respective band is achieved that at the critical narrowest point of the insert even at long service Grooves at best to an extent that they represent no danger to the casting operation and also in terms of quality of the obtained tape are not critical.
  • the invention is based on the empirical assumption that at non-moving side plates due to the emergence of the grooves in the worst case, the point at which melt penetrates into the recess between insert and casting roll recess, at about 3/4 of Height of the bath level measured over the outlet of the casting gap and the width of the groove formed in each case corresponds to a maximum of half the strip thickness to a good approximation. Based on this assumption can then be estimated taking into account the progress of the formation of the grooves in the axial direction of the casting rolls in accordance with the invention, the Absenkrate by which the side plates must be lowered in the vertical direction to prevent the formation of grooves.
  • the movement carried out according to the invention starts immediately with the casting operation.
  • Due to continuous displacement of the side plate in the conveying direction of the cast strip, the cast molten metal has less time in the critical area for solidification, so that the abrasive wear caused by it is low.
  • the adjustment according to the invention leads to a significant extension of the service life of the side plates used in a two-roll casting machine.
  • the Anstellrate with which the side plates in addition to the invention in the conveying direction of the tape movement in the axial direction, ie along the rotational or longitudinal axes of the casting rolls, must be moved in a machine operated according to the invention to about one Can be reduced by a third of the setting rates set in conventional two-roll casting machines.
  • the thickness loss of the side plates occurring over the casting time is correspondingly low, so that a lifetime of the inserts of the side plates which is significantly longer than the prior art is achieved.
  • the respectively specifically selected rate of movement of the adjustment according to the invention can be adjusted within the abovementioned limits, taking into account the properties of the respectively processed molten metal and the remaining boundary conditions of the casting. For example, when casting high temperature steel grades and inserting lower hardness inserts, higher rates of movement can be set to compensate for the wear of the insert than is the case when less temperature resistant molten steel is cast using a harder insert. Also, for example, when required by high cooling capacity or a corresponding composition of the process gas used in each case to support the formation of the band shells rapid solidification of the metal and accordingly high band forming forces In order to avoid the formation of grooves, higher movement rates are set than under process conditions in which the respectively cast metal in the casting gap becomes less fast and correspondingly less wear of the inserts occurs.
  • the determination of the lowering rate should also take into account the time over which contact between the melt and the insert has taken place.
  • the reference contact time t cref can thereby be determined by a casting test, in which the respective molten material to be cast is cast in combination with the insert ceramic to be used in each case with this melt material in the respective two-roll casting machine without the side plates provided with the ceramic inserts being moved become.
  • the reference contact time t cref is then the average time at which a corresponding grooving has formed over the cast length.
  • a further advantageous embodiment of the invention is characterized in that the side plates are additionally moved in the axial direction of the casting rolls against their respectively associated end faces with a force superimposed, for example axial Bewegunsgsrate. at This combined adjustment of the side plates in the axial direction of the casting rolls and conveying direction of the cast strip is ensured at all times that the side plates bear with the force required for the sealing of the casting gap on the end faces of the casting rolls.
  • the movement of the side plates in the axial direction of the casting rolls is preferably carried out continuously parallel to their movement according to the invention in the conveying direction and depending, for example, on the high temperature properties of the refractory used for the insert of the side plates, the casting properties of the cast steel, the strip thickness, in the conveying direction of the cast strip effective lowering rate and / or the progress of the training of the insert.
  • the two-roll casting machine 1 comprises, in addition to a large number of other units not shown here, two casting rolls 2, 3 which are parallel to one another in their longitudinal direction are aligned and define a casting gap 4 on its longitudinal sides between them.
  • the casting rolls 2, 3 rotate in opposite directions about their horizontally aligned axes of rotation D 2, D 3, which coincide with their longitudinal axes, so that their circumferential surfaces, coming from above, dip into the casting gap 4.
  • the cast strip B formed in the casting gap 4 leaves the casting gap 4 at its lower, narrow outlet opening 4a in a vertically oriented conveying direction F.
  • Both narrow sides of the G umanspalts 4 are sealed by a respective side plate 5,6, which is formed by a support plate 5a and a supported by the support plate 5a, to the respective side plate 5,6 associated end faces of the casting rolls 2,3 fitting insert 5b, the is made of a ceramic refractory material.
  • the side plates 5, 6 are operated by adjusting devices 7a, 7b, 8a, 8b which act in horizontally along the axes of rotation D2, D3 of the casting rolls 2, 3 and 3, with the contact force required for a permanent seal with a force superimposed, for example, axial movement rate, pressed against their respective associated end faces of the casting rolls 2.3.
  • the adjusting devices 7a, 7b, 8a, 8b act on an intermediate plate on the side plates 5.6, on which the respective side plate 5.6 is mounted in a vertical, parallel to the conveying direction F of the cast strip B aligned direction Z slidably.
  • the intermediate plate carries in each case a pair of 9.10 of in vertical, parallel to the direction of action F effective direction Z adjusting 9a, 9b, of which each one adjusting 9a on the one casting roll 2 and the other adjusting device 9b on the other casting roll associated side of the side plates 5,6 is arranged.
  • the molten steel is poured into the casting gap 4 with casting rolls 2, 3 rotating against one another at a certain circumferential speed, so that a melt pool P forms over its outlet opening 4a, the bath level of which is at a height h 1 is located above the outlet opening 4a of the casting gap 4.
  • the melt impinging on the circumferential surface of the casting rolls 2, 3 solidifies there, so that a band shell forms on the casting rolls 2, 3 in each case.
  • These band shells are taken from the casting rolls 2.3 in the direction of the outlet opening 4a of the casting gap 4 until they are in the so-called Nip-point NP meet and there are pressed together to the cast strip B to be produced.
  • the side plates 5, 6 are continuously lowered by their respectively associated adjusting devices 9, 10 in the vertical direction of action Z parallel to the conveying direction F of the cast strip B at a specific lowering rate.
  • the height and thus the extent of the grooves G1, G2 are minimized, which between the peripheral surfaces of the casting rolls 2, 3 and the side faces 5 c, 5 d of the inserts 5 adjoining them , 6 due to the abrasive, unavoidable by the contact of the respective insert 5.6 with the solidifying in the casting gap 4 molten steel melt.
  • .delta.h s H G - s G + r GW 2 - H L 2 2 - r GW 2 * - 1 .
  • v S a G - a v ⁇ ⁇ ⁇ H s k G for the lowering of the side plates 5,6 in the direction of action Z a Absenkrate of 0.86 mm per km cast strip.
  • the vertical lowering rate increases to 1.29 mm / km cast strip, in accordance with the above formula .
  • the necessary vertical lowering rate for groove avoidance is thus to be increased.
  • the reference contact time t cref is determined empirically for each of the steel materials to be cast and for each casting machine. Basically, it is true that ever smaller is the contact time t c between ceramic insert and melt, the lower is the respectively required movement rate of the ceramic.
  • the groove formation rates a G and axial feed rates a v determined for a SiO 2 ceramic having an Si content of more than 50% and a Mn-containing melt are set for different contact times t c and Mn contents% Mn indicated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulding By Coating Moulds (AREA)

Claims (6)

  1. Procédé pour l'exploitation d'une machine de coulée à deux cylindres pour la coulée de bains de fusion métalliques, en particulier d'acier liquide, en feuillard coulé (B), avec deux cylindres de coulée (2, 3), qui sont entraînés en rotation opposée, autour d'un axe de rotation respectif D2, D3), et qui limitent entre eux une fente de coulée (4) sur les côtés longitudinaux de celle-ci, et avec des plaques latérales (5, 6), qui en service de coulée, assurent l'étanchéité de la fente de coulée (4), sur les côtés étroits de celle-ci, en venant porter contre les côtés frontaux des cylindres de coulée (2, 3) en pontant la fente de coulée (4) avec un matériau réfractaire, les plaques latérales (5, 6) étant mues, pendant le fonctionnement de coulée, dans la direction verticale (Z), qui est orientée parallèlement à la direction de transport (F), dans laquelle le feuillard coulé (B) quitte la fente de coulée (4), des évidements (G1, G2) se formant progressivement dans le matériau réfractaire des plaques latérales, au cours du service de coulée, caractérisé en ce que
    la vitesse de descente Vs, à laquelle les plaques latérales (5, 6) sont abaissées dans la direction verticale (Z), en fonction de la longueur de feuillard coulé (B), chaque fois coulée, est réglée selon la formule suivante: v s = a G - a v ⋅ Δ ⁢ h s k G
    Figure imgb0012
     dans laquelle:
    vs : Vitesse de descente en mm par km de feuillard coulé (B),
    aG: Vitesse à laquelle les évidements (G1, G2) en forme de fentes se forment dans la direction axiale, en mm par km de feuillard coulé (B),
    av: Taux d'avance lors d'un déplacement optionnel des plaques latérales (5, 6) dans la direction axiale (Y), en mm par km de feuillard coulé (B),
    kG : Profondeur critique des évidements (G1, G2) en forme de fentes, en mm,
    Δhs: Valeur de laquelle les plaques latérales (5, 6) sont au moins déplacées par km courant de feuillard coulé (B), dans la direction verticale, pendant le service de coulée, pour éviter les séquelles de la formation d'un évidement (G1, G2) en forme de fente, laquelle valeur est calculée (en mm) selon la formule sui- vante : Δh s = h G - s G + r GW 2 - h L 2 2 - r GW 2 * - 1
    Figure imgb0013
    dans laquelle s G : s G = h 1 - h G n ⋅ s h 1 n ⋅ 2
    Figure imgb0014
    h1 : Hauteur du niveau du bain ;
    hs : Différence de hauteur de chaque formation de fente observée par rapport à l'endroit (NP) de la fente de coulée (4), auquel les coquilles de feuillard, soli- difiées sur les cylindres de coulée (2, 3), se ren- contrent;
    n : 0,5 - 0,65 ;
    ΓGW: Rayon circonférentiel des cylindres de coulée (2, 3) ;
    S : Epaisseur du feuillard coulé (B).
  2. Procédé selon la revendication 1, caractérisé en ce que les plaques latérales (5, 6) sont déplacées, dans la direction verticale (Z), de 0,1 à 50 mm par kilomètre de feuillard coulé (B).
  3. Procédé selon la revendication 2, caractérisé en ce que les plaques latérales (5, 6) sont déplacées, dans la direction verticale, de 0,5 à 1,5 mm par kilomètre de feuillard coulé (B).
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que les plaques latérales (5, 6) sont mues, en plus, dans la direction axiale (Y) des cylindres de coulée (2, 3) contre les côtés frontaux, qui leur sont respectivement associés.
  5. Procédé selon la revendication 4, caractérisé en ce que les plaques latérales (5, 6) sont mues continuellement dans la direction axiale des cylindres de coulée (2, 3), en fonction de la longueur de feuillard coulé (B), chaque fois coulée.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que les plaques latérales (5, 6), lors de la fuite de bain de fusion sur leurs bords inférieurs, dans la direction de transport, sont abaissées à une vitesse accélérée jusqu'à ce que la fuite du bain de fusion ait cessé de nouveau.
EP06819633A 2005-11-18 2006-11-20 Procede de fonctionnement d'une machine de coulee a deux cylindres pour la coulee de metaux en fusion en bande coulee Not-in-force EP1957220B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005054996A DE102005054996A1 (de) 2005-11-18 2005-11-18 Verfahren zum Betrieb einer Zweiwalzengießmaschine zum Vergießen von Metallschmelzen zu gegossenem Band
PCT/EP2006/068683 WO2007057469A1 (fr) 2005-11-18 2006-11-20 Procede de fonctionnement d'une machine de coulee a deux cylindres pour la coulee de metaux en fusion en bande coulee

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EP1957220A1 EP1957220A1 (fr) 2008-08-20
EP1957220B1 true EP1957220B1 (fr) 2009-05-13

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US (1) US7938167B2 (fr)
EP (1) EP1957220B1 (fr)
KR (1) KR101323335B1 (fr)
AT (1) ATE431209T1 (fr)
DE (2) DE102005054996A1 (fr)
WO (1) WO2007057469A1 (fr)

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Publication number Priority date Publication date Assignee Title
US7556084B2 (en) * 2006-03-24 2009-07-07 Nucor Corporation Long wear side dams
US8042601B2 (en) * 2006-03-24 2011-10-25 Nucor Corporation Side dam with insert
DE102008010689B4 (de) * 2008-02-22 2018-10-31 Outokumpu Nirosta Gmbh Zwei-Walzen-Gießmaschine zum Herstellen von aus einer Metallschmelze gegossenem Band
US20090236068A1 (en) 2008-03-19 2009-09-24 Nucor Corporation Strip casting apparatus for rapid set and change of casting rolls
RU2491149C2 (ru) * 2008-03-19 2013-08-27 Ньюкор Корпорейшн Устройство для литья полосы с позиционированием литейных валков
US20090288798A1 (en) * 2008-05-23 2009-11-26 Nucor Corporation Method and apparatus for controlling temperature of thin cast strip
US8141618B2 (en) * 2008-06-24 2012-03-27 Nucor Corporation Strip casting method for controlling edge quality and apparatus therefor
JP5837758B2 (ja) 2011-04-27 2015-12-24 キャストリップ・リミテッド・ライアビリティ・カンパニー 双ロール鋳造装置及びその制御方法
JP7233161B2 (ja) * 2016-11-07 2023-03-06 日本製鉄株式会社 サイドシール装置、双ロール式連続鋳造装置、及び、薄肉鋳片の製造方法
US10850322B2 (en) * 2017-10-30 2020-12-01 Nucor Corporation Casting stand control system with radius roll feedback and method of use

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JPH082481B2 (ja) * 1988-08-10 1996-01-17 日新製鋼株式会社 薄板連鋳機
KR100333070B1 (ko) * 1997-12-20 2002-10-18 주식회사 포스코 쌍롤식박판주조장치에서의에지댐위치제어방법
JP2000117397A (ja) 1998-10-21 2000-04-25 Nippon Steel Corp 薄鋼板の鋳造方法
DE10056916A1 (de) * 2000-11-16 2002-05-23 Sms Demag Ag Verfahren zum Stranggießen eines Metallbandes
AT412195B (de) * 2002-06-25 2004-11-25 Voest Alpine Ind Anlagen Verfahren zur erzeugung eines metallbandes mit einer zweiwalzengiesseinrichtung

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KR101323335B1 (ko) 2013-10-30
KR20080065310A (ko) 2008-07-11
US20090090484A1 (en) 2009-04-09
WO2007057469A1 (fr) 2007-05-24
DE102005054996A1 (de) 2007-05-24
US7938167B2 (en) 2011-05-10
DE502006003743D1 (de) 2009-06-25
EP1957220A1 (fr) 2008-08-20
ATE431209T1 (de) 2009-05-15

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