US20090126895A1 - Molten metal feed nozzle - Google Patents

Molten metal feed nozzle Download PDF

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Publication number
US20090126895A1
US20090126895A1 US11/577,882 US57788205A US2009126895A1 US 20090126895 A1 US20090126895 A1 US 20090126895A1 US 57788205 A US57788205 A US 57788205A US 2009126895 A1 US2009126895 A1 US 2009126895A1
Authority
US
United States
Prior art keywords
molten metal
rolls
extension
feed nozzle
nozzle
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.)
Abandoned
Application number
US11/577,882
Other languages
English (en)
Inventor
Hiroyuki Otsuka
Akihiko Kimatsuka
Shiro Osada
Hiroki 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
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 IHI Corp filed Critical IHI Corp
Assigned to ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO., LTD. reassignment ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIMATSUKA, AKIHIKO, YOSHIZAWA, HIROKI, OTSUKA, HIROYUKI, FUKASE, HISAHIKO, OSADA, SHIRO, MAHAPATRA, RAMA, WOODBERRY, PETER
Publication of US20090126895A1 publication Critical patent/US20090126895A1/en
Abandoned legal-status Critical Current

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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 molten metal feed nozzle incorporated in a twin roll caster
  • FIG. 1 shows an example of a 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 P 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.
  • the molten metal pool 7 is formed and the rolls l 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 sees 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 P 0 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 molten metal feed nozzle positioned above a nip between rolls of a twin roll caster and having ends spaced apart from side weirs comprising extensions each contiguous with the nozzle end and extending toward the side weir such that a stagnation area disappears on a free liquid surface of molten metal.
  • 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.
  • FIG. 1 A schematic diagram showing an example of a twin roll caster.
  • FIG. 2 A schematic diagram showing flow velocity distribution on a free surface of molten metal adjacent to a molten metal feed nozzle shown in FIG. 1 .
  • FIG. 3 A partial perspective view from below showing a first embodiment of a molten metal feed nozzle according to the invention.
  • FIG. 4 A schematic diagram of the molten metal feed nozzle in FIG. 3 looking axially of the chilled rolls.
  • FIG. 5 A schematic diagram of the molten metal feed nozzle in FIG. 3 looking tangentially of the chilled roil.
  • FIG. 6 A schematic diagram showing flow velocity distribution on a free surface of molten metal adjacent to the molten metal feed nozzle of FIG. 3 .
  • FIG. 7 A partial perspective view from below showing a second embodiment of a molten metal feed nozzle according to the invention.
  • FIG. 8 A schematic diagram of the molten metal feed nozzle in FIG. 7 looking axially of the chilled rolls.
  • FIG. 9 A partial perspective view from below showing a third embodiment of a molten metal feed nozzle according to the invention.
  • FIG. 10 A schematic diagram of the molten metal feed nozzle in FIG. 9 looking axially of the chilled rolls.
  • 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 P 1 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 P 2 and 23 extremely close to the side weir 2 .
  • 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 P 2 , P 3 , P 4 and P 5 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)
US11/577,882 2004-10-27 2005-10-20 Molten metal feed nozzle Abandoned US20090126895A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004311962A JP4720145B2 (ja) 2004-10-27 2004-10-27 溶湯供給ノズル
JP2004-311962 2004-10-27
PCT/JP2005/019282 WO2006046459A1 (ja) 2004-10-27 2005-10-20 溶湯供給ノズル

Publications (1)

Publication Number Publication Date
US20090126895A1 true US20090126895A1 (en) 2009-05-21

Family

ID=36227699

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/577,882 Abandoned US20090126895A1 (en) 2004-10-27 2005-10-20 Molten metal feed nozzle

Country Status (8)

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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784208A (en) * 1987-03-24 1988-11-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Dual roll type continuous casting machine
US4883113A (en) * 1988-03-03 1989-11-28 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Pouring device for dual-roll type continuous casting machine

Family Cites Families (6)

* 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
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784208A (en) * 1987-03-24 1988-11-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Dual roll type continuous casting machine
US4883113A (en) * 1988-03-03 1989-11-28 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Pouring device for dual-roll type continuous casting machine

Also Published As

Publication number Publication date
EP1818120B1 (en) 2011-04-20
WO2006046459A1 (ja) 2006-05-04
KR100947756B1 (ko) 2010-03-18
CN101048247A (zh) 2007-10-03
JP4720145B2 (ja) 2011-07-13
JP2006122933A (ja) 2006-05-18
AU2005298039A1 (en) 2006-05-04
EP1818120A4 (en) 2008-05-07
DE602005027603D1 (de) 2011-06-01
KR20070068440A (ko) 2007-06-29
EP1818120A1 (en) 2007-08-15
AU2005298039B2 (en) 2010-03-04
CN101048247B (zh) 2011-02-09

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Date Code Title Description
AS Assignment

Owner name: ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO., LTD., JA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OTSUKA, HIROYUKI;KIMATSUKA, AKIHIKO;OSADA, SHIRO;AND OTHERS;REEL/FRAME:020027/0111;SIGNING DATES FROM 20070321 TO 20070523

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION