WO2007123485A1 - Agitateur - Google Patents

Agitateur Download PDF

Info

Publication number
WO2007123485A1
WO2007123485A1 PCT/SE2007/050269 SE2007050269W WO2007123485A1 WO 2007123485 A1 WO2007123485 A1 WO 2007123485A1 SE 2007050269 W SE2007050269 W SE 2007050269W WO 2007123485 A1 WO2007123485 A1 WO 2007123485A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
meniscus
iron core
molten metal
casting
Prior art date
Application number
PCT/SE2007/050269
Other languages
English (en)
Inventor
Sten Kollberg
Jan-Erik Eriksson
Original Assignee
Abb Ab
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 Abb Ab filed Critical Abb Ab
Priority to JP2009507643A priority Critical patent/JP2009535216A/ja
Priority to CN2007800111680A priority patent/CN101410204B/zh
Priority to US12/298,537 priority patent/US20090255642A1/en
Priority to EP07748430A priority patent/EP2010346A4/fr
Publication of WO2007123485A1 publication Critical patent/WO2007123485A1/fr
Priority to US13/402,144 priority patent/US20120199308A1/en

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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects
    • 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
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper

Definitions

  • the present invention relates to a device for continuous or semicontinuous casting of metals, comprising a stirrer according to the preamble to claim 1.
  • a molten metal is supplied to a casting mould, hereinafter designated mould, in which it is cooled and formed into an elongated strand.
  • the strand is designated BILLET, BLOOM or SLAB.
  • a primary flow of hot, molten metal is supplied to the cooled mould, in which the metal is cooled and at least partially solidifies into an elongated strand.
  • the cooled and partially solidified strand then continuously leaves the mould. At the ⁇ point where the strand leaves the mould, it has at least a mechanically self-supporting, solidified casing that surrounds a non-solidified centre.
  • the cooled mould is open at two opposite ends in the casting direction and preferably connected to means for supporting the mould and means for supplying coolant to the mould and supporting means.
  • the mould is preferably made of a copper-based alloy with good thermal conductivity.
  • the molten metal is supplied to the mould via a casting tube . that extends down in to the mould.
  • the casting tube preferably extends so far. down into the mould that it projects into the molten metal that exists therein.
  • the pri ⁇ mary flow leads downwards in the casting direction, whereas the secondary flow leads from the region of the walls of the mould upwards towards the surface of the metal bath located therein, designated the meniscus, and downwards. In different metal bath, designated the meniscus, and then downwards again.
  • the meniscus is covered by a layer consisting of casting powder intended to act as protection against the surrounding atmosphere and to minimize heat losses.
  • hot metal flow is allowed to enter into the mould in an uncontrolled manner, the flow will penetrate deep into the cast strand, which probably will have a negative influence on the quality and productivity.
  • An uncontrolled hot metal flow in the cast strand may result in encapsulation of non-metallic particles and/or gas occlusions in the solidified strand, or cause casting defects in the inner structure of the cast strand.
  • a deep penetration of hot metal flow may also cause a partial remelting of the solidified surface structure so that the melt penetrates the surface layer below the mould, which causes severe disturbances in production and a long downtime for repair.
  • Velocity variations caused by oscillating flow in the mould give rise to pressure variations at the meniscus, and, in addition, variations in height arise at the meniscus.
  • Velocity variations caused by oscillating flow in the mould give rise to pressure variations at the meniscus, and, in addition, variations in height arise at the meniscus.
  • the velocity of flow and hence the turbulence at the meniscus become too high, this leads to slag being drawn down from the casting powder and further down into the solidified strand, and results in an increased risk of cracking due to uneven shell growth.
  • the velocity becomes too low at the meniscus there is a risk of temperature differences arising, which may lead to local solidification at the meniscus with ensuing risks of cracking and of slag particles adhering under the shell that is solidifying at the meniscus.
  • the object of the present invention is to provide a device for continuous or semicontinuous casting of metals, especially intended for casting of slabs, which contributes to reduce or eliminate the disadvantages mentioned above.
  • a device is aimed at which creates an even flow at the meniscus for different speeds of the inflowing melt.
  • the metal flow at the meniscus is directed away from the narrow sides of the mould inwards towards the casting tube and uniformly across the whole width of the melt, and, in addition, a homogeneous flow configuration is obtained at the meniscus which provides the lowest turbulence when the flow is uniform across the whole mould width.
  • a stirrer placed as previously described a sufficiently large counter-directed meniscus flow is obtained uniformly over the whole width of the casting mould while at the same time the turbulence is restricted.
  • the location of the stirrer also contributes to obtain a good rotation of the melt around the casting tube and the installation of the stirrer is considerably simpler compared with prior art solutions.
  • the secondary flow is utilized in an optimum way while at the same time, with the help of the stirrer, it is modified so as to obtain a good symmetrical flow of the melt in the mould including a good horizontal flow of the melt around the casting tube, which promotes an even shell growth while at the same time the amount of inclusions in the finished strand is reduced.
  • an optimum flow is meant that the velocity of the melt at the meniscus (the secondary flow) is maintained at a constant level without varying in time while at the same time the velocity of the metal flow (the primary flow) directed downwards from the casting tube is to be kept at as low a level as possible to minimize the risk of inclusions accompanying the melt far down into the solidified strand.
  • the dimension of the iron cores of the stirrer in the vertical direction is usually 240-280 mm.
  • the iron core is arranged such that its upper part is positioned at a distance away from the meniscus that lies from 50 mm above the surface of the meniscus to 150 mm below said surface.
  • the iron core is ar- ranged such that its upper part is positioned at a distance away from the meniscus that lies from 50 mm above the surface of the meniscus to 100 mm below said surface.
  • two stirrers are arranged symmetrically around the centre line of the broad sides of the mould and on both sides of said broad sides . Since the iron cores of the stirrers only need to cover part of the width of the cast strand, such a device provides a cost-effective solution since a good rotation of the melt around the casting tube as well as an even velocity profile over the thickness of the width of the cast strand are obtained.
  • stir- rers are placed asymmetrically, on respective sides of the long sides of the mould.
  • This embodiment provides advantages such as lower weight, lower power consumption and reduced influence of magnetic fields on the surroundings.
  • the pole pitch is large, which results in a maximally effective stirrer.
  • Figure 1 is an explanatory sketch of the device according to the invention.
  • Figure 2 is a top view according to one embodiment of the device according to the invention.
  • Figure 3 is an exploded view of a continuous casting device according to the invention.
  • Figure 1 shows an explanatory sketch of the invention, comprising a mould 1 enclosing a melt 2 which is supplied to the mould 1 by means of a casting tube 3 lowered into the melt.
  • the melt 2 is cooled and a partially solidified strand is formed.
  • the strand is then moved continuously out of the mould 1.
  • at least one stirrer 4 is arranged which has an iron core and a coil applied around it and, with the iron cores arranged so as not to cover the whole length of the broad sides of the mould but instead at least 50% of the broad sides of the mould and at most 80% of the broad sides of the mould, symmetrically about the centre line 5 of the mould 1 on both sides of the broad sides of the mould.
  • the iron cores are arranged such that their upper parts are positioned at a distance from the meniscus that lies from 50 mm above the surface 7 of the meniscus to 195 mm below said surface 7, in order to create a rotating stirring of the melt below the meniscus 7 by means of a period low- frequency travelling field.
  • Figure 2 shows an alternative embodiment of the invention, wherein the stirrers 8 are located asymmetrically on respective sides of the broad sides 10 of the mould 9 and arranged such that the upper parts of the iron cores are positioned at a distance from the meniscus that lies from 50 mm above the surface of the meniscus to 195 mm below said surface.

Abstract

L'invention concerne un dispositif de coulage continu ou semi-continu de métal. Le dispositif comprend un moule (1), un tube de coulage (3) par le biais duquel un métal en fusion est injecté dans un métal en fusion (2) déjà présent dans le moule (1) dans une région située à une certaine distance sous le ménisque (7) du dernier métal en fusion, et au moins un agitateur (4) consistant en un noyau de fer et en une bobine appliquée autour de celui-ci, où le noyau de fer est disposé pour longer le large côté du moule (1), conçu pour appliquer un champ magnétique au métal en fusion (2) et agiter ainsi ledit produit de fusion (2). Le noyau de fer est disposé de telle sorte que sa partie supérieure est positionnée à une certaine distance du ménisque (7), soit entre 50 mm au-dessus de la surface du ménisque (7) et 195 mm sous ladite surface. La longueur du noyau de fer par rapport à la longueur du large côté du moule (1) correspond au moins à 50% et au plus à80% du côté large du moule (1).
PCT/SE2007/050269 2006-04-25 2007-04-25 Agitateur WO2007123485A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2009507643A JP2009535216A (ja) 2006-04-25 2007-04-25 攪拌装置
CN2007800111680A CN101410204B (zh) 2006-04-25 2007-04-25 用于连续或半连续铸造金属的装置
US12/298,537 US20090255642A1 (en) 2006-04-25 2007-04-25 Stirrer
EP07748430A EP2010346A4 (fr) 2006-04-25 2007-04-25 Agitateur
US13/402,144 US20120199308A1 (en) 2006-04-25 2012-02-22 Stirrer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0600919 2006-04-25
SE0600919-5 2006-04-25

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/402,144 Division US20120199308A1 (en) 2006-04-25 2012-02-22 Stirrer

Publications (1)

Publication Number Publication Date
WO2007123485A1 true WO2007123485A1 (fr) 2007-11-01

Family

ID=38625289

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2007/050269 WO2007123485A1 (fr) 2006-04-25 2007-04-25 Agitateur

Country Status (7)

Country Link
US (2) US20090255642A1 (fr)
EP (1) EP2010346A4 (fr)
JP (1) JP2009535216A (fr)
KR (1) KR20090016445A (fr)
CN (1) CN101410204B (fr)
RU (1) RU2419508C2 (fr)
WO (1) WO2007123485A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6631162B2 (ja) * 2015-10-30 2020-01-15 日本製鉄株式会社 複層鋳片の連続鋳造方法及び連続鋳造装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5717355A (en) * 1980-07-02 1982-01-29 Nippon Kokan Kk <Nkk> Method for electromagnetic stirring of molten sheet within mold in slab continuous casting
JPS6114052A (ja) * 1984-06-28 1986-01-22 Toshiba Corp 電磁撹拌方法
JPH11179498A (ja) * 1997-12-25 1999-07-06 Kawasaki Steel Corp 連続鋳造方法
JP2000061599A (ja) * 1998-08-26 2000-02-29 Sumitomo Metal Ind Ltd 連続鋳造方法
JP2003225745A (ja) * 2002-01-31 2003-08-12 Jfe Steel Kk 鋼の連続鋳造方法

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5775268A (en) * 1980-10-30 1982-05-11 Nippon Kokan Kk <Nkk> Electromagnetic stirring method for molten steel in mold in continuous casting plant
JPS58100955A (ja) * 1981-12-11 1983-06-15 Kawasaki Steel Corp 連続鋳造鋳型内溶鋼の撹拌方法およびその装置
US4746268A (en) * 1987-07-29 1988-05-24 Hitachi, Ltd. End face mechanical shaft seal for use in hydraulic machines and seal ring assembly for use in the shaft seal
US5085265A (en) * 1990-03-23 1992-02-04 Nkk Corporation Method for continuous casting of molten steel and apparatus therefor
JPH07314104A (ja) * 1994-05-24 1995-12-05 Nippon Steel Corp 連続鋳造における鋳型内溶鋼流動制御法
IT1288900B1 (it) * 1996-05-13 1998-09-25 Danieli Off Mecc Procedimento di colata continua con campo magnetico pulsante e relativo dispositivo
WO2000005015A1 (fr) * 1998-07-24 2000-02-03 Gibbs Die Casting Aluminum Corporation Procede et appareil de moulage semi-solide
FR2801523B1 (fr) * 1999-11-25 2001-12-28 Usinor Procede de coulee continue des metaux du type utilisant des champs electromagnetiques, et lingotiere et installation de coulee pour sa mise en oeuvre
SE516850C2 (sv) * 2000-07-05 2002-03-12 Abb Ab Förfarande och anordning för styrning av omröring i en gjutsträng
JP3417906B2 (ja) * 2000-07-07 2003-06-16 株式会社神戸製鋼所 連続鋳造鋳型内の電磁攪拌方法
JP2006507950A (ja) * 2002-11-29 2006-03-09 アーベーベー・アーベー コントロールシステム、コンピュータプログラム製品、装置及び方法
JP4256723B2 (ja) * 2003-06-05 2009-04-22 新日本製鐵株式会社 溶鋼の連続鋳造方法
JP2005238276A (ja) * 2004-02-26 2005-09-08 Nippon Steel Corp 電磁攪拌鋳造装置
JP4553639B2 (ja) * 2004-06-17 2010-09-29 株式会社神戸製鋼所 連続鋳造方法
JP4441384B2 (ja) * 2004-07-07 2010-03-31 新日本製鐵株式会社 連続鋳造方法ならびにストランドプール内流動制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5717355A (en) * 1980-07-02 1982-01-29 Nippon Kokan Kk <Nkk> Method for electromagnetic stirring of molten sheet within mold in slab continuous casting
JPS6114052A (ja) * 1984-06-28 1986-01-22 Toshiba Corp 電磁撹拌方法
JPH11179498A (ja) * 1997-12-25 1999-07-06 Kawasaki Steel Corp 連続鋳造方法
JP2000061599A (ja) * 1998-08-26 2000-02-29 Sumitomo Metal Ind Ltd 連続鋳造方法
JP2003225745A (ja) * 2002-01-31 2003-08-12 Jfe Steel Kk 鋼の連続鋳造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200022, Derwent World Patents Index; Class M22, AN 2000-250352, XP008130419 *
See also references of EP2010346A4 *

Also Published As

Publication number Publication date
US20120199308A1 (en) 2012-08-09
JP2009535216A (ja) 2009-10-01
EP2010346A1 (fr) 2009-01-07
RU2419508C2 (ru) 2011-05-27
US20090255642A1 (en) 2009-10-15
KR20090016445A (ko) 2009-02-13
RU2008141879A (ru) 2010-05-27
CN101410204B (zh) 2011-03-02
CN101410204A (zh) 2009-04-15
EP2010346A4 (fr) 2013-02-20

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