EP1818120B1 - Machine de coulée à deux rouleaux avec buse conique d'alimentation de métal fondu - Google Patents

Machine de coulée à deux rouleaux avec buse conique d'alimentation de métal fondu Download PDF

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Publication number
EP1818120B1
EP1818120B1 EP05795467A EP05795467A EP1818120B1 EP 1818120 B1 EP1818120 B1 EP 1818120B1 EP 05795467 A EP05795467 A EP 05795467A EP 05795467 A EP05795467 A EP 05795467A EP 1818120 B1 EP1818120 B1 EP 1818120B1
Authority
EP
European Patent Office
Prior art keywords
molten metal
nozzle
rolls
extension
twin roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05795467A
Other languages
German (de)
English (en)
Japanese (ja)
Other versions
EP1818120A1 (fr
EP1818120A4 (fr
Inventor
Hiroyuki c/o Ishikawajima-Harima Heavy OTSUKA
Akihiko c/o Ishikawajima-Harima Heavy KIMATSUKA
Shiro c/o Ishikawajima-Harima Heavy OSADA
Hiroki c/o Ishikawajima-Harima Heavy YOSHIZAWA
Hisahiko Fukase
Rama Mahapatra
Peter Woodberry
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
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Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Publication of EP1818120A1 publication Critical patent/EP1818120A1/fr
Publication of EP1818120A4 publication Critical patent/EP1818120A4/fr
Application granted granted Critical
Publication of EP1818120B1 publication Critical patent/EP1818120B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles
    • 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
    • B22D11/10—Supplying or treating molten metal
    • 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
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to a twin roll caster comprising a nozzle with two opposite ends, rolls and side weirs, wherein each of the nozzle ends is provided with an extension which has a lower portion immersed in a molten metal pool and extends towards the respective side weir.
  • twin roll casters are known from DE 3 809 416 A1 , WO 99/14005 and US 4,883,113 .
  • Fig. 1 shows an example of a known twin roll caster with a pair of chilled rolls 1 arranged horizontally and in parallel with each other and a pair of side weirs 2 associated with the chilled rolls 1.
  • the rolls 1 through which cooling water flows interiorly are adapted to increase or decrease a nip or gap G between the rolls depending upon thickness of a strip 3 to be produced.
  • Rotational directions and velocities of the rolls 1 are set such that respective outer peripheries of the rolls are moved from above toward the nip G at constant velocity.
  • One and the other of the side weirs 2 are urged to surface-contact one and the other ends of the rolls 1, respectively.
  • a molten metal feed nozzle made of refractory is positioned just above the nip G between the rolls.
  • the feed nozzle has an elongated nozzle trough 5 which in turn has a top opened for reception of molten metal 4 and longitudinal side walls formed at their lower ends with a plurality of openings 6 for passage from the trough 5 to the outer peripheries of the rolls 1, the openings being spaced apart from each other axially of the rolls 1.
  • a molten metal pool 7 is formed above the nip G between the rolls and in contact with the outer peripheries of the rolls 1.
  • the molten metal pool 7 is formed and the rolls 1 chilled by passage of the cooling water are rotated, the molten metal 4 is solidified on the outer peripheries of the rolls 1 and the strip 3 is delivered downwardly from the nip G between the rolls.
  • Molten metal feed nozzles incorporated in twin roll casters may be divided into those with ends of the nozzle which surface-contact the side weirs 2 (see, for example, Reference 1) and those with ends of the nozzle which are spaced apart from and in parallel with the side weirs 2 (see, for example, Reference 2).
  • the molten metal feed nozzle remains unchanged in its longitudinal size.
  • leakage of the molten metal 4 becomes unsuppressed by merely increasing the force for urging the side weirs 2 to the rolls 1.
  • flow velocity distribution at free liquid surface of the molten metal 4 tends to be low at between two parallel surfaces facing to each other, i.e., a surface 9 of the side weir on the molten metal pool and an end wall surface 10 of the molten metal nozzle, in comparison with at between a longitudinal side wall surface 8 of the molten metal nozzle and the chilled roll 1.
  • an area A where the molten metal 4 tends to stagnate is formed especially from the end wall surface 10 to a point P0 which is an intersection of nip center line L with the surface 9 of the side weir.
  • the strip 3 When such unwanted solidification shell is pinched as foreign matter by the solidification shells generated on the outer peripheries of the chilled rolls 1 upon rotation of the rolls, the strip 3 may be locally thickened into defective shape and/or the nip G between the rolls may be enlarged depending upon part of the strip 3 where the foreign matter is pinched, resulting in break of the strip 3 due to reduction in cooling efficiency and heat recuperation from the molten metal 4.
  • the invention was made in view of the above and has its object to provide a molten metal feed nozzle which can avert break of a strip.
  • the invention is directed to a twin roll caster comprising a nozzle with two opposite ends, rolls and side weirs, wherein each of the nozzle ends is provided with an extension which has a lower portion immersed in a molten metal pool and extends towards the respective side weir, characterised in that the respective extension is tapering in longitudinal direction of the nozzle from the lower portion of the extension to the corresponding side weir.
  • the extensions eliminate stagnation areas of the free liquid surface of the molten metal; they prevent the molten metal from being lowered in temperature due to radiation heat transmission and suppress generation of unwanted solidification shells.
  • Figs. 3 to 6 show a first embodiment of a molten metal feed nozzle according to the invention in which parts identical with those in Figs. 1 and 2 are represented by the same reference numerals.
  • Each of nozzle ends is provided with an extension 11 which has a lower portion immersed in a molten metal pool 7 and extends toward a side weir 2 such that a stagnation area A (see Fig. 2 ) disappears on a free liquid surface of molten metal 4.
  • the extension 11 is in the form of a quadrangular pyramid lying sidelong and is convergent to point P1 extremely close to the side weir 2.
  • the stagnation area A on the free liquid surface of the molten metal 4 is displaced by the extension 11 contiguous with the nozzle end to suppress generation of an unwanted solidification shell.
  • no unwanted solidification shell is pinched as foreign matter by the solidification shells generated on the outer peripheries on the chilled rolls 1 for production of the strip 3, whereby break of the strip 3 due to enlargement of the nip G between the rolls can be averted.
  • the extension 11 is gradually reduced in volume toward the side weir 2, so that heat transmission from the molten metal 4 to the extension 11 is reduced.
  • the molten metal 4 adjacent to the side weir 2 can be effectively prevented from being lowered in temperature and no unwanted solidification shell for the side weir 2 is generated.
  • Figs. 7 and 8 shows a second embodiment of a molten metal feed nozzle according to the invention.
  • parts identical with those shown in Figs. 3 to 6 are represented by the same reference numerals.
  • Each of nozzle ends is provided with an extension 12 which has a lower portion immersed in a molten metal pool 7 and extends toward a side weir 2 such that a stagnation area A (see Fig. 2 ) disappears on a free liquid surface of molten metal 4.
  • the extension 12 is wedge shaped and is converged to a horizontal line segment between points P2 and P3 extremely close to the side weir 2.
  • the stagnation area A on the free liquid surface of the molten metal 4 is displaced by the extension 12 contiguous with the nozzle end to suppress generation of unwanted solidification shell.
  • no unwanted solidification shell is pinched as foreign matter by the solidification shells generated on the outer peripheries of the chilled roll 1 for production of the strip 3, whereby break of the strip 3 due to enlargement of the nip G between the rolls can be averted.
  • the extension 12 is gradually reduced in volume toward the side weir 2, so that heat transmission from the molten metal 4 (see Fig. 6 ) to the extension 12 is reduced so that the molten metal 4 adjacent to the side weir 2 can be effectively prevented from being lowered in temperature and no unwanted solidification shell for the side weir 2 is generated.
  • Figs. 9 and 10 show a third embodiment of a molten metal feed nozzle according to the invention.
  • parts identical with those in Figs. 3 to 7 are represented by the same reference numerals.
  • Each of nozzle ends is provided with an extension 13 which has a lower portion immersed in a molten metal pool 7 and extends to a side weir 2 such that a stagnation area A (see Fig. 2 ) disappears on a free liquid surface of molten metal 4.
  • the extension 13 is in the form of tapered quadratic prism lying sidelong and is converged to vertical face with corners P2, P3, P4 and P5 extremely close to the side weir 2.
  • Heat transmission from the molten metal 4 (see Fig. 6 ) to the extension 13 may be much in comparison with the first and second embodiments; however, the third embodiment is easier in machining upon fabrication of the molten metal feed nozzle.
  • a molten metal feed nozzle of the invention is not limited to the above embodiments and that various changes and modifications may be made without departing from the scope of the invention.
  • a molten metal feed nozzle of the invention is applicable to production of strips of steel or other various metals.

Landscapes

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

Abstract

L'invention concerne une buse d'alimentation de métal fondu, à l'extrémité de laquelle est formé un corps d'extension (11) ayant une partie inférieure immergée dans un puisard de métal fondu et dirigée vers un seuil latéral (2) de façon à ce que la surface d'une partie stagnante sur le niveau de liquide libre d'un métal fondu puisse être éliminée. Le corps d'extension (11) prend la forme d'une pyramide quadrangulaire retombée latéralement et converge vers un point (P1) à proximité du seuil latéral (2). Dans la mesure où la buse remplace la surface de la partie stagnante sur le niveau de liquide libre du métal fondu avec le corps d'extension (11) prolongeant l'extrémité de la buse pour supprimer la formation de coquille solidifiée inutile, la coquille solidifiée générée à la surface périphérique externe de rouleaux de refroidissement (1) et formant une bande ne contient pas la coquille solidifiée inutile en tant que matière étrangère et on peut éviter la cassure de la bande résultant d'une augmentation de l'espace entre les rouleaux.

Claims (4)

  1. Machine de coulée à cylindres jumelés, comprenant une buse ayant deux extrémités opposées, des cylindres (1) et des déversoirs latéraux (2), sachant que chacune des extrémités de la buse est pourvue d'un prolongement qui possède une extrémité inférieure immergée dans un bain de métal fondu (7) et s'étend vers le déversoir latéral respectif (2),
    caractérisée en ce que le prolongement respectif s'étend de manière conique dans la direction longitudinale de la buse depuis la partie inférieure du prolongement jusqu'au déversoir latéral correspondant (2).
  2. Machine de coulée à cylindres jumelés selon la revendication 1, caractérisée en ce que le prolongement respectif (11) se présente sous la forme d'une pyramide quadrangulaire couchée sur le côté et converge en direction d'un point (P1) à proximité dudit déversoir latéral (2).
  3. Machine de coulée à cylindres jumelés selon la revendication 1, caractérisée en ce que le prolongement respectif (12) est cunéiforme et converge en direction d'un tronçon de droite horizontale entre des points (P2 et P3) à proximité dudit déversoir latéral (2).
  4. Machine de coulée à cylindres jumelés selon la revendication 1, caractérisée en ce que le prolongement respectif (13) se présente sous la forme d'un prisme quadratique conique couché sur le côté et converge en direction d'une face verticale ayant des coins (P2, P3, P4 et P5) à proximité dudit déversoir latéral (2).
EP05795467A 2004-10-27 2005-10-20 Machine de coulée à deux rouleaux avec buse conique d'alimentation de métal fondu Expired - Fee Related EP1818120B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004311962A JP4720145B2 (ja) 2004-10-27 2004-10-27 溶湯供給ノズル
PCT/JP2005/019282 WO2006046459A1 (fr) 2004-10-27 2005-10-20 Buse d'alimentation de métal fondu

Publications (3)

Publication Number Publication Date
EP1818120A1 EP1818120A1 (fr) 2007-08-15
EP1818120A4 EP1818120A4 (fr) 2008-05-07
EP1818120B1 true EP1818120B1 (fr) 2011-04-20

Family

ID=36227699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05795467A Expired - Fee Related EP1818120B1 (fr) 2004-10-27 2005-10-20 Machine de coulée à deux rouleaux avec buse conique d'alimentation de métal fondu

Country Status (8)

Country Link
US (1) US20090126895A1 (fr)
EP (1) EP1818120B1 (fr)
JP (1) JP4720145B2 (fr)
KR (1) KR100947756B1 (fr)
CN (1) CN101048247B (fr)
AU (1) AU2005298039B2 (fr)
DE (1) DE602005027603D1 (fr)
WO (1) WO2006046459A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6245456A (ja) 1985-08-23 1987-02-27 Ishikawajima Harima Heavy Ind Co Ltd 双ロ−ル式連続鋳造機
JPS63235046A (ja) * 1987-03-24 1988-09-30 Ishikawajima Harima Heavy Ind Co Ltd 双ロ−ル式連続鋳造機
US4883113A (en) * 1988-03-03 1989-11-28 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Pouring device for dual-roll type continuous casting machine
JPH07102426B2 (ja) * 1988-06-20 1995-11-08 株式会社日立製作所 双ロール式連続鋳造装置
JP3063808B2 (ja) 1992-10-06 2000-07-12 新日本製鐵株式会社 双ロール式連続鋳造装置
JP2781734B2 (ja) * 1994-12-14 1998-07-30 新日本製鐵株式会社 広幅薄肉鋳片の連続鋳造用ノズル
JPH1058095A (ja) * 1996-08-14 1998-03-03 Nippon Steel Corp 薄鋳片連続鋳造装置の仕切り板
AUPO926197A0 (en) * 1997-09-17 1997-10-09 Bhp Steel (Jla) Pty Limited Casting steel strip

Also Published As

Publication number Publication date
AU2005298039B2 (en) 2010-03-04
WO2006046459A1 (fr) 2006-05-04
US20090126895A1 (en) 2009-05-21
CN101048247B (zh) 2011-02-09
CN101048247A (zh) 2007-10-03
AU2005298039A1 (en) 2006-05-04
KR20070068440A (ko) 2007-06-29
JP4720145B2 (ja) 2011-07-13
JP2006122933A (ja) 2006-05-18
DE602005027603D1 (de) 2011-06-01
EP1818120A1 (fr) 2007-08-15
KR100947756B1 (ko) 2010-03-18
EP1818120A4 (fr) 2008-05-07

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