WO2007087686A1 - Machine de coulee a deux rouleaux - Google Patents

Machine de coulee a deux rouleaux Download PDF

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Publication number
WO2007087686A1
WO2007087686A1 PCT/AU2007/000103 AU2007000103W WO2007087686A1 WO 2007087686 A1 WO2007087686 A1 WO 2007087686A1 AU 2007000103 W AU2007000103 W AU 2007000103W WO 2007087686 A1 WO2007087686 A1 WO 2007087686A1
Authority
WO
WIPO (PCT)
Prior art keywords
segment
casting
side wall
molten metal
metal
Prior art date
Application number
PCT/AU2007/000103
Other languages
English (en)
Inventor
Hiroyuki Otsuka
Shiro Osada
Hisahiko Fukase
Original Assignee
Bluescope Steel Limited
Castrip Llc
Ihi Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bluescope Steel Limited, Castrip Llc, Ihi Corporation filed Critical Bluescope Steel Limited
Publication of WO2007087686A1 publication Critical patent/WO2007087686A1/fr

Links

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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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

Definitions

  • the present invention relates to a twin roll casting machine.
  • nip is used herein to refer to the general region at which the rolls are closest together.
  • the molten metal may be poured from a ladle into a smaller vessel or series of vessels from which it flows through a metal delivery nozzle located above the nip, for forming a casting pool of molten metal supported on the casting surfaces of the rolls above the nip and extending along the length of the casting rolls.
  • This casting pool is usually confined between side plates or dams held in sliding engagement adjacent the ends of the casting rolls so as to restrict the casting pool against outflow.
  • Figures 5 to 7 illustrate an example of a known twin roll type casting machine.
  • the machine comprises a pair of water-cooled casting rolls Ia, Ib positioned laterally to form a roll nip G between them, and a pair of side plates 2a, 2b engage the ends of the casting rolls Ia, Ib.
  • the direction and speed of rotation of the counter-rotating casting rolls Ia, Ib are set so that the outer circumferential surfaces of the casting rolls move from above towards the roll nip G.
  • One of the side plates 2a, 2b is in contact with the ends of the two casting rolls Ia, Ib at one end of the rolls, and the other of the side plates 2a, 2b is in contact with the ends of the two casting rolls Ia, Ib at the other end of the rolls Ia, Ib.
  • a molten metal delivery nozzle that comprises two elongated molten metal delivery segments 4a, 4b made from a refractory material is positioned above the roll nip G in a space enclosed by the casting rolls Ia, Ib and the side plates 2a, 2b.
  • Each segment 4a, 4b comprises side walls and end walls that define an upwardly opening elongated trough 6 for receiving molten metal 5 and a plurality of outlet openings 7 for outflow of molten metal from the trough 6.
  • the openings 7 are formed in a lower section of the side walls of the segments 4a, 4b to direct molten metal from the trough 6 outwardly towards the outer circumferential surfaces of the casting rolls Ia, Ib.
  • the segment 4a is supported at a selected spacing inwardly of the side plate 2a.
  • the segment 4b is supported at a selected spacing inwardly of the side plate 2b.
  • molten metal 5 poured into the troughs 6 of the segments 4a, 4b flows outwardly through the openings 7 and forms a casting pool of molten metal 8 in contact with the outer circumferential surfaces of the casting rolls 1 over the roll nip G.
  • molten metal 5 solidifies on the outer circumferential surfaces of the casting rolls Ia, Ib and forms solidified shells 9.
  • a downwardly moving strip 3 is formed by the solidified shells 9 coming together at the roll nip G.
  • the openings 7 in the segment 4a are positioned so that, in use, molten metal flows outwardly towards a cylindrical surface of the casting roll Ia that extends along a length of the casting roll Ia identified by the letter "P" in Figure 6a.
  • the openings 7 in the segment 4a are positioned so that, in use, molten metal flows outwardly towards a cylindrical surface of the casting roll Ia that extends along a length of the casting roll Ib identified by the letter "Q" in Figure 6a.
  • the openings 7 in the segment 4b are positioned so that, in use, molten metal flows outwardly towards a cylindrical surface of the casting roll Ia that extends along a length of the casting roll Ia identified by the letter "R” in Figure 6a.
  • the openings 7 in the segment 4b are positioned so that, in use, molten metal flows outwardly towards a cylindrical surface of the casting roll Ia that extends along a length of the casting roll Ib identified by the letter "S" in Figure 6a.
  • the strip 3 that is produced and exits the nip between the casting rolls Ia, Ib has a relatively- thick solidified shell 9 in the central section of the strip and larger unsolidified zones in outer sections of the strip.
  • the resultant solidified strip 3 after shrinkage during solidification, has a cross sectional shape in which there is localising thickening of the front and back surfaces of the central section of the strip and pronounced variation in the strip thickness across the width of the strip. This is undesirable because it may cause difficulties coiling the strip.
  • the present invention provides an improved molten metal delivery nozzle and a method of casting thin strip with the delivery nozzle.
  • a metal delivery apparatus for casting metal strip comprising a molten delivery nozzle having at least one elongated segment, at least one segment comprising an opposed pair of side walls and an opposed pair of end walls that define an elongated trough for receiving molten metal and a plurality of outlet openings in the side walls for outflow of molten metal from the trough, and at least one end of the segment being formed so that one side wall at that end of the segment extends further axially than the other side wall of the segment.
  • the end wall at the said end of the segment may comprise at least one portion that extends in a plane oblique to the longitudinal axis of the segment.
  • the end wall at the other end of the segment may be a squared end.
  • the openings in one side wall of the segment may extend axially further than the openings in the other side wall of the segment.
  • the metal delivery apparatus may comprise at least two of said segments positioned in end to end relationship in a line with the end of each segment at adjacent ends of the segment being formed as described above .
  • a twin roll casting machine for casting metal strip comprising a pair of water-cooled casting rolls laterally positioned to form a nip there between and counter-rotatable about rotational axes thereof, a molten delivery nozzle positioned above the nip between the casting rolls, the nozzle comprising at least two elongated segments, at least one segment comprising an opposed pair of side walls and an opposed pair of end walls that define an upwardly opening elongated trough for receiving molten metal and a plurality of outlet openings in the side walls for outflow of molten metal from the trough towards the casting rolls, the segments being positioned in end to end relationship in a line that is parallel to the axes of the casting rolls, and the end of each segment at adjacent ends of the segments being formed so that one side wall extends axially further along the length of the casting rolls than the other side wall of the segment .
  • each segment at adjacent ends of the segments may include at least one portion that extends in a plane oblique to the line that is parallel to the axis of the casting rolls.
  • the end wall at the other end of the each segment may be a squared end.
  • each segment may at adjacent ends of the segments extend axially further along the length of the casting rolls than the openings in the other side wall of the segment.
  • Also disclosed is a method of casting metal strip comprising:
  • Figure 1 is a largely schematic top plan view that shows the position of the casting rolls and metal delivery nozzle in one embodiment of a twin roll casting machine ;
  • Figure 2 is a largely schematic enlarged perspective view that shows the position of the casting rolls (in phantom outline) and metal delivery nozzle segments in one embodiment of a twin roll strip casting machine shown in FIG 1 ;
  • Figure 3 is an enlarged cross-sectional top plan view of the ends of adjacent segments of the metal delivery nozzle shown in FIG. 2;
  • Figure 4 is an enlarged cross-sectional top plan view of the ends of adjacent segments of an alternative embodiment of a metal delivery nozzle
  • Figure 5 is a largely schematic end view of an example of a prior art twin roll casting
  • Figure 6 is a largely schematic top plan view that shows the position of the casting rolls and metal delivery nozzle in the example of the prior art twin roll casting machine shown in Fig 5 ;
  • Figure 7 is an enlarged cross-sectional top plan view of the ends of adjacent segments of the metal delivery nozzle shown in FIG. 6 ;
  • Fig 1 and Fig 6 also illustrate in largely schematic plan view of various stages of shell solidification on the roll surfaces as the molten metal solidifies into strip as it passes through the nip DETAILED DESCRIPTION OF THE INVENTION
  • Figures 1 and 2 illustrate one embodiment of a twin roll casting machine envisaged by the present invention.
  • the twin roll casting machine shown in Figures 1 and 2 comprises casting rolls Ia, Ib, side plates 2a, 2b, and a molten metal delivery nozzle that comprises segments 11a, lib, with the other members being identified by the same symbols in Figures 5 to 7.
  • the segment 11a is supported in a position directly above the roll gap G that is a selected distance from the side plate 2a, and the other segment lib is supported in a position directly above the roll gap G that is a selected distance from the other side plate 2b.
  • Each segment 11a, lib comprises side walls and end walls that define an upwardly opening elongated trough 6 for receiving molten metal 5 and a plurality of outlet openings 7 for outflow of molten metal from the trough 6.
  • the openings 7 are formed in a lower section of the side walls of the segments 4a, 4b to direct molten metal from the trough 6 outwardly towards the outer circumferential surfaces of the casting rolls Ia, Ib.
  • the opening 7 are in the form of slots that are uniformly spaced along the length of each side wall.
  • molten metal 5 poured into the troughs 6 of the segments 4a, 4b flows outwardly through the openings 7 and forms a casting pool of molten metal 8 in contact with the outer circumferential surfaces of the casting rolls 1 over the roll nip G.
  • each segment 11a, lib has a longer side wall and a shorter side wall .
  • the segments 11a, lib are positioned so that the shorter side wall of the segment 11a and the longer side wall of the segment lib face the casting roll Ia and the longer side wall of the segment 11a and the shorter side wall of the segment lib face the casting roll Ib.
  • the openings 7 in the segment lib supply molten metal to the cooling roll Ia along a relatively long section "U” of the casting roll Ia and supply molten metal to the cooling roll Ib along a relatively short section "W" of the casting roll Ib.
  • the strip 3 that is produced and exits the nip between the casting rolls Ia, Ib has relatively thick solidified shells 9 in a relatively wide central section of the strip compared to that shown in Figure 6 (b) and unsolidified zones in relatively smaller outer sections of the strip compared to that shown in Figure 6 (b) .
  • the cross section of the strip 3 has a greater thickness on the underside of the strip at a position in the vicinity of the edge on one side and a greater thickness on the upper side of the strip at a position in the vicinity of the edge on the other side, and when this is compared with the example of the prior art in Figures 5 to 7, the variation in the distribution of thickness across the lateral direction of the strip is less pronounced and consequently there is less difficulty in coiling the strip .
  • Figure 3 illustrates an example of one specific shape of the opposite ends of the segments 11a, lib, with the same members as in Figures 5 to 7 being identified by the same symbols.
  • each adjacent end wall of the segments 11a, lib extend in a plane that is oblique to the longitudinal axis of the segment. Specifically, each end wall extends between the side walls at an angle that is less than 90 degrees to the axis of the segment. The angle shown in the Figure is 45 degrees.
  • Figure 4 illustrates a further example of a specific shape of the opposite ends of the segments 11a, lib, with the same members as in Figures 5 to 7 being identified by the same symbols.
  • each adjacent end wall of the segments 11a, lib extend in a plane that is generally oblique to the longitudinal axis of the segment.
  • each end wall comprises a first short section that extends inwardly perpendicular to the side walls and an intermediate section that extends between these sections at an angle that is less than 90 degrees to the axis of the segment.
  • the angle shown in the Figure is 45 degrees.
  • the twin roll casting machine envisaged by the present invention may be employed for the manufacture of strip from steel and other metals.

Landscapes

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

Abstract

L'invention concerne un appareil de distribution de métal destiné à la coulée d'une bande de métal. L'appareil comporte une buse de distribution de matière en fusion présentant au moins un segment (11a, 11b) allongé. Au moins un segment comporte une paire de parois latérales opposées et une paire de parois d'extrémité opposées qui définissent une auge allongée destinée à recevoir le métal en fusion et une pluralité d'ouvertures (7) de sortie dans les parois latérales pour la sortie de métal en fusion de l'auge. Au moins une extrémité du segment est formée de façon à ce qu'une paroi latérale à l'extrémité en question du segment s'étende plus loin axialement que l'autre paroi latérale du segment.
PCT/AU2007/000103 2006-02-02 2007-02-02 Machine de coulee a deux rouleaux WO2007087686A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-025806 2006-02-02
JP2006025806A JP2007203337A (ja) 2006-02-02 2006-02-02 双ロール鋳造機

Publications (1)

Publication Number Publication Date
WO2007087686A1 true WO2007087686A1 (fr) 2007-08-09

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Family Applications (1)

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PCT/AU2007/000103 WO2007087686A1 (fr) 2006-02-02 2007-02-02 Machine de coulee a deux rouleaux

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JP (1) JP2007203337A (fr)
WO (1) WO2007087686A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008086580A1 (fr) * 2007-01-19 2008-07-24 Bluescope Steel Limited Buse de distribution à écoulement plus uniforme et procédé de coulée en continu à l'aide de celle-ci
US7690417B2 (en) 2001-09-14 2010-04-06 Nucor Corporation Thin cast strip with controlled manganese and low oxygen levels and method for making same
WO2010102600A1 (fr) * 2009-03-12 2010-09-16 Salzgitter Flachstahl Gmbh Buse de coulée pour une installation horizontale de coulée en bande mince
US7926550B2 (en) 2007-01-19 2011-04-19 Nucor Corporation Casting delivery nozzle with insert
CN113649535A (zh) * 2021-08-06 2021-11-16 东北大学 一种双辊薄带连铸水口装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5135906B2 (ja) * 2007-06-19 2013-02-06 株式会社Ｉｈｉ 双ロール鋳造機

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3544878A1 (de) * 1984-12-28 1986-07-17 Hitachi Metals, Ltd., Tokio/Tokyo Verfahren zum herstellen eines metallbleches oder metallbandes
JPH07303945A (ja) * 1994-05-11 1995-11-21 Nippon Steel Corp 金属薄帯の製造方法および製造用ノズル

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06154958A (ja) * 1992-11-20 1994-06-03 Nippon Steel Corp 双ロール式連続鋳造方法
JPH09225596A (ja) * 1996-02-26 1997-09-02 Mitsubishi Heavy Ind Ltd 双ドラム式連続鋳造方法及び装置
AUPP802499A0 (en) * 1999-01-06 1999-01-28 Bhp Steel (Jla) Pty Limited Strip casting apparatus
JP4307216B2 (ja) * 2003-10-21 2009-08-05 新日本製鐵株式会社 薄鋳片連続鋳造装置用浸漬ノズル及び鋳造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3544878A1 (de) * 1984-12-28 1986-07-17 Hitachi Metals, Ltd., Tokio/Tokyo Verfahren zum herstellen eines metallbleches oder metallbandes
JPH07303945A (ja) * 1994-05-11 1995-11-21 Nippon Steel Corp 金属薄帯の製造方法および製造用ノズル

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class M22, AN 96-35436/04 *
DATABASE WPI Derwent World Patents Index; Class P53, AN 86-190731/30 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7690417B2 (en) 2001-09-14 2010-04-06 Nucor Corporation Thin cast strip with controlled manganese and low oxygen levels and method for making same
WO2008086580A1 (fr) * 2007-01-19 2008-07-24 Bluescope Steel Limited Buse de distribution à écoulement plus uniforme et procédé de coulée en continu à l'aide de celle-ci
US7926550B2 (en) 2007-01-19 2011-04-19 Nucor Corporation Casting delivery nozzle with insert
US7926549B2 (en) 2007-01-19 2011-04-19 Nucor Corporation Delivery nozzle with more uniform flow and method of continuous casting by use thereof
WO2010102600A1 (fr) * 2009-03-12 2010-09-16 Salzgitter Flachstahl Gmbh Buse de coulée pour une installation horizontale de coulée en bande mince
US8302663B2 (en) 2009-03-12 2012-11-06 Salzgitter Flachstahl Gmbh Casting nozzle for a horizontal continuous casting system
CN113649535A (zh) * 2021-08-06 2021-11-16 东北大学 一种双辊薄带连铸水口装置

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