US20090242162A1 - Sealing device for twin roll caster - Google Patents

Sealing device for twin roll caster Download PDF

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Publication number
US20090242162A1
US20090242162A1 US12/295,328 US29532806A US2009242162A1 US 20090242162 A1 US20090242162 A1 US 20090242162A1 US 29532806 A US29532806 A US 29532806A US 2009242162 A1 US2009242162 A1 US 2009242162A1
Authority
US
United States
Prior art keywords
roll
rolls
cowlings
transition piece
brush
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
US12/295,328
Other languages
English (en)
Inventor
Shiro Osada
Hisahiko Fukase
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 IHI CORPORATION reassignment IHI CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKASE, HISAHIKO, OSADA, SHIRO
Publication of US20090242162A1 publication Critical patent/US20090242162A1/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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/106—Shielding the molten jet
    • 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
    • B22D11/0645—Sealing means for the nozzle between the travelling surfaces
    • 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
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • 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
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere

Definitions

  • the present invention relates to a sealing device for a twin roll caster.
  • FIG. 1 shows an example of a twin roll caster comprising a pair of chilled rolls 1 arranged horizontally side by side and a pair of side weirs 2 associated with the rolls 1 .
  • the rolls 1 are constructed such that cooling water passes through interiors of the rolls and that a nip G between the rolls may be adjusted to be increased or decreased depending upon thickness of a steel strip 3 to be produced.
  • the velocity and direction of rotation of the rolls 1 are set such that the outer peripheries of the respective rolls 1 move from above towards the nip G at the same velocity.
  • One of the side weirs 2 surface-contacts one ends of the rolls 1 and the other side weir 2 , the other ends of the rolls 1 .
  • a transition piece 4 is arranged to surface-contact upper ends of the side weirs 2 .
  • a melt supplying nozzle 5 is incorporated in the transition piece 4 so as to be positioned just above the nip G. By supplying melt from the nozzle 5 to the space defined by the rolls 1 and the side weirs 2 , a melt pool 6 is formed.
  • the rolls 1 are rotated while cooled through passage of cooling water, melt solidifies on outer peripheries of the rolls 1 , a resultant strip 3 being delivered downward from the nip G.
  • a cover is provided to cover the melt pool 6 and inert gas is fed inside the cover to prevent oxidation of the melt.
  • a melt-pool cover with rotary bodies has been proposed, each of the rotary bodies wrapped with woven cloth being arranged to abut against an outer surface of the cover and against an outer periphery of the corresponding roll 1 all over axial length thereof so that the woven cloth may suppress invasion of atmospheric air inside the cover (see, for example, Reference 1).
  • Nitrogen is generally used as inert gas to be fed inside the cover.
  • argon which is relatively low in heat conductivity, is mixed with nitrogen and the mixture is fed inside the cover; then, heat of the melt becomes less transmittable to the rolls 1 to suppress temperature increase of the outer peripheries of the rolls 1 , so that the strip 3 thin in thickness can be obtained without especially lowering rotating velocity of the rolls and without causing development of strip breakage due to insufficient production of solidification shells.
  • a direction of rotation of the rotary body is, when seeing axially thereof, contradictory to that of the roll 1 against which the rotary body abuts, so that the atmospheric air is pinched between the rotary body and the roll 1 , which facilitates accompaniment of the atmospheric air to the roll 1 .
  • the invention was made in view of the above and has its object to provide a sealing device for a twin roll caster which can suppress accompaniment of the atmospheric air to the rolls.
  • the invention comprises a transition piece positioned above a melt pool formed between chilled rolls, rotatable cylindrical brushes extending axially of the rolls and each abutting against an outer periphery of the corresponding roll all over axial length thereof on a side away from the pool and below the transition piece, first cowlings contiguous with the transition piece and each covering the corresponding roll in between the transition piece and the corresponding brush, second cowlings contiguous with said first cowlings and each surrounding a portion of the brush not in contact with the roll, third cowlings contiguous with said second cowlings and each covering the roll below the brush and outlets for feeding sealing gas in between the transition piece and the rolls.
  • the sealing gas from each of the outlets is guided by the first, second and third cowlings covering the corresponding roll and the brush to flow in a direction contradictory to a direction of rotation of the roll.
  • the brush is rotated in the same direction as that of rotation of the roll against which the brush abuts; alternatively, the sealing gas flowing along the outer periphery of the roll is set to have a velocity exceeding an absolute value of a peripheral velocity of the roll.
  • FIG. 1 is a schematic view showing an example of a conventional twin roll caster
  • FIG. 2 is a schematic view showing an embodiment of a sealing device for a twin roll caster according to the invention.
  • FIG. 2 shows the embodiment of a sealing device for a twin roll caster according to the invention in which parts similar to those in FIG. 1 are represented by the same reference numerals.
  • the sealing device for the twin roll caster comprises rotatable cylindrical brushes 7 extending axially of the rolls 1 , outlets 8 for discharging sealing gas S such as pure or argon-containing nitrogen, and first, second and third cowlings 9 , 10 and 11 associated with each of the rolls 1 to provide a flow passage for the sealing gas S.
  • sealing gas S such as pure or argon-containing nitrogen
  • Each of the brushes 7 is arranged below the transition piece 4 to abut against an outer periphery of the corresponding roll 1 all over axial length thereof on a side away from a melt pool 6 and is rotatable by drive mechanism such as motor in a same direction, when seeing axially, as that of rotation of the roll 1 against which the brush 7 abuts.
  • the outlet 8 is mounted on a bottom of the transition piece so as to be positioned just above each of the rolls 1 .
  • the first cowling 9 is contiguous with the bottom of the transition piece 4 and covers the outer periphery and end peripheral borders of the roll 1 in between the transition piece 4 and the brush 7 .
  • a distance between the first cowling 9 and the outer periphery of the roll 1 is set to be 5-10 mm.
  • the second cowling 10 is contiguous with the first cowling and surrounds a portion of the brush 7 not in contact with roll 1 to cover an adjacent outer periphery portion and end peripheral borders of the roll 1 .
  • a distance between the second cowling 10 and the outer periphery of the brush 7 is set to be less than 10 mm so that dusts may not enter into the first cowling 9 due to rotation of the brush 7 .
  • the third cowling 11 is contiguous with the second cowling 10 and covers the outer periphery and end peripheral borders of the roll 1 below the brush 7 .
  • a distance between the third cowling 11 and the outer periphery of the roll 1 is set to be substantially equal to the above-mentioned distance between the first cowling 9 and the outer periphery of the roll 1 or to be within three times as much as that.
  • the third cowling 11 is set to have length along the periphery of the roll 1 of 50 mm or more, so that the sealing gas S from the outlet 8 is adapted to fill up to an outlet portion of the third cowling 11 so as to prevent the atmospheric air from entering inside of the third cowling 11 .
  • Sum in flow rate of the sealing gas S from the two outlets 8 is set such that a velocity of the sealing gas S flowing between the first cowling 9 and the roll 1 exceeds an absolute value of a peripheral velocity (2 m/second) of the roll 1 .
  • gas flow rate gas discharge rate/roll number ⁇ roll length ⁇ cowling-roll distance
  • the sealing gas S from the outlet 8 is guided by the first, second and third cowlings 9 , 10 and 11 covering the roll 1 and the brush 7 so as to flow with velocity exceeding the absolute value of the peripheral velocity of the roll 1 and in a direction contradictory to that of rotation of the roll 1 , the brush 7 in contact with the roll 1 being rotated in the same direction as that of rotation of the roll 1 , so that accompaniment of the atmospheric air to the roll 1 can be effectively suppressed.
  • a sealing device for a twin roll caster according to the invention is applicable to production of not only steel strips but also other various metal strips.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
US12/295,328 2006-04-26 2006-04-26 Sealing device for twin roll caster Abandoned US20090242162A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/308707 WO2007129372A1 (fr) 2006-04-26 2006-04-26 Appareil d'etancheite pour machine de coulee entre cylindres

Publications (1)

Publication Number Publication Date
US20090242162A1 true US20090242162A1 (en) 2009-10-01

Family

ID=38667493

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/295,328 Abandoned US20090242162A1 (en) 2006-04-26 2006-04-26 Sealing device for twin roll caster

Country Status (5)

Country Link
US (1) US20090242162A1 (fr)
EP (1) EP2011589A4 (fr)
CN (1) CN101426601B (fr)
BR (1) BRPI0621615B1 (fr)
WO (1) WO2007129372A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170129003A1 (en) * 2015-11-10 2017-05-11 Posco Twin-roll strip caster and casting method using same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022204686A1 (de) * 2022-05-13 2023-11-16 Sms Group Gmbh Zwei-Rollen-Gießeinrichtung zur Erzeugung eines gegossenen Metallbandes, und Verfahren zur Kühlung und/oder Reinigung einer Außenoberfläche einer Gießrolle einer Zwei-Rollen-Gießeinrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040045696A1 (en) * 2000-12-30 2004-03-11 Heinrich Marti Method for operating a strip casting machine and jacket ring for a casting roll used to carry out said method
US20060237162A1 (en) * 2004-12-13 2006-10-26 Nucor Corporation Method and apparatus for localized control of heat flux in thin cast strip

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2591098B2 (ja) * 1988-07-26 1997-03-19 石川島播磨重工業株式会社 双ロール式連続鋳造機
JP2760695B2 (ja) 1992-03-23 1998-06-04 日立造船株式会社 ツインロール型連続鋳造設備における湯溜カバー
US5590701A (en) * 1992-07-21 1997-01-07 Ishikawajima-Harima Heavy Industries Co., Ltd. Strip caster
JPH08309489A (ja) * 1995-05-17 1996-11-26 Mitsubishi Heavy Ind Ltd 双ドラム式鋳造装置
JP2000061589A (ja) * 1998-08-18 2000-02-29 Alps Electric Co Ltd 金属薄帯製造装置
CN1240686A (zh) * 1998-06-09 2000-01-12 阿尔卑斯电气株式会社 金属薄带的制造装置及其制造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040045696A1 (en) * 2000-12-30 2004-03-11 Heinrich Marti Method for operating a strip casting machine and jacket ring for a casting roll used to carry out said method
US20060237162A1 (en) * 2004-12-13 2006-10-26 Nucor Corporation Method and apparatus for localized control of heat flux in thin cast strip

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170129003A1 (en) * 2015-11-10 2017-05-11 Posco Twin-roll strip caster and casting method using same
CN106984780A (zh) * 2015-11-10 2017-07-28 Posco公司 双辊式带钢连铸机及使用其的铸造方法

Also Published As

Publication number Publication date
CN101426601A (zh) 2009-05-06
EP2011589A1 (fr) 2009-01-07
BRPI0621615B1 (pt) 2015-07-21
WO2007129372A1 (fr) 2007-11-15
CN101426601B (zh) 2013-01-02
EP2011589A4 (fr) 2009-11-25
BRPI0621615A2 (pt) 2011-12-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: IHI CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OSADA, SHIRO;FUKASE, HISAHIKO;REEL/FRAME:021626/0758

Effective date: 20080905

STCB Information on status: application discontinuation

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