US20060124272A1 - Continuous casting installation for the electromagnetic rotation of molten metal moving inside the nozzle - Google Patents

Continuous casting installation for the electromagnetic rotation of molten metal moving inside the nozzle Download PDF

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Publication number
US20060124272A1
US20060124272A1 US10/561,067 US56106705A US2006124272A1 US 20060124272 A1 US20060124272 A1 US 20060124272A1 US 56106705 A US56106705 A US 56106705A US 2006124272 A1 US2006124272 A1 US 2006124272A1
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United States
Prior art keywords
nozzle
inductor
continuous casting
pole
casting installation
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Abandoned
Application number
US10/561,067
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English (en)
Inventor
Jean-Marie Galpin
Gerard Perrin
Marc Anderhuber
Robert Bolcato
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USINOR SA
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USINOR SA
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Assigned to USINOR reassignment USINOR ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GALPIN, JEAN-MARIE, ANDERHUBER, MARC, PERRIN, GERARD, BOLCATO, ROBERT
Publication of US20060124272A1 publication Critical patent/US20060124272A1/en
Abandoned legal-status Critical Current

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    • 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
    • B22D41/62—Pouring-nozzles with stirring or vibrating means
    • 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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H2250/00—Electrical heat generating means
    • F24H2250/08—Induction

Definitions

  • the present invention relates to the continuous casting of metals, particularly steel, employing a submerged casting nozzle that dips into a mold placed thereunder. More precisely, the invention relates to the induction of axial rotation of the liquid metal flowing through such a nozzle between the pouring tundish and the mold.
  • the induction of rotation of the flows in the casting nozzle thus appears to be an effective means for preventing the appearance of visible surface flaws, of the blister and exfoliation type, on cold-rolled strips of grades of steel for automobile application and of packaging steel.
  • This technique therefore means fewer crack repair operations on continuous cast slabs (reduction or even elimination of exfoliation-type surface flaws on strips), elimination of downgrading and of lawsuits in the case of blister-type flaws, and also increased productivity of casting machines by having longer runs and higher casting rates.
  • actuators The induction of the rotation of the liquid metal in the casting nozzle has already been proposed using various types of actuator. Basically, two types of actuator may be distinguished, namely “passive” actuators and “active” actuators.
  • Passive actuators use inter alia modifications in the design of the internal wall of the nozzle (for example, spirals), components, such as a propeller, helicoidal internal nozzle, etc., which are fitted into the actual body of the nozzle, or modifications in the upper part of the nozzle at the join with the tundish (for example, an acceleration cone) or else modifications in the actual component for regulating the metal flow rate in the nozzle.
  • the major drawbacks of this type of actuator are that the rotation speed generated is directly dependent on the flow rate of the metal passing through the nozzle and that preferential sites for the deposition of inclusions in the nozzle are formed, hence the potential increase in the risk of the nozzle being blocked.
  • Active actuators are essentially of electromagnetic nature—a static annular electromagnetic inductor of the polyphase type closely surrounds the nozzle over a portion of its length and generates a magnetic field that rotates about the casting axis, intended to cause the liquid metal present in the nozzle to undergo axial rotation therewith. If required, the reader will find examples described in the documents JP 06 023498 or JP 07 108355 or else JP 07 148561.
  • the confined space allied with necessarily high stored electrical power together with the desirable reduction in the airgap by reducing the distance between the inwardly salient pole tooth that projects beyond the winding and the nozzle, in order to maximize the electromagnetic coupling, inevitably result in fact in a lower energy efficiency at the same time as a certain degree of possible disorganization in the rotational movements of the metal, in particular as a result of the risk of spurious bridging of the magnetic flux between poles corresponding to different phases of the power supply that are too close.
  • the object of the present invention is to propose a solution for electromagnetically inducing rotation of the liquid metal within a casting nozzle but does not have the drawbacks of the known solutions.
  • the subject of the invention is an installation for the continuous casting of metals, particularly steel, in which the submerged nozzle, via which the molten metal to be cast arrives in the mold from a tundish located thereabove, is surrounded by a static annular electromagnetic inductor having a magnetic field that rotates about the casting axis and is intended to force the molten metal to rotate axially therewith, said inductor being of the polyphase traversing-magnetic-field type, which inductor is provided with a pair of poles per phase and each pole of which is formed by an electrical winding wound around an inwardly salient pole tooth that terminates in a pole face placed facing and close to the nozzle, the pole teeth being connected together by an outer peripheral magnetic yoke that closes the magnetic flux circuit, said installation being characterized in that each pole tooth has a lateral taper (for example, a bevel) at the end of its salient part, that increases the distance by which the pole faces are separated from one another.
  • a static annular electromagnetic inductor
  • the annular inductor is formed as two articulated half-shells that can pivot, enabling them to be closed up around the nozzle.
  • the invention employs what is called a “traversing” magnetic field, that is to say a field that passes through the axis of the nozzle without a manifest reduction in its intensity between the edge and the center of the nozzle.
  • the rotating magnetic field produced is of the desired “traversing” type.
  • the casting axis is at the center of the airgap of the inductor and the field produced prospers in this airgap by passing through the casting axis so as, from a given magnetic pole, to rejoin the paired magnetic pole of opposite sign located opposite it but not beside it, as would be the case with an inductor having distributed poles or having several pairs of poles per phase.
  • Tests carried out on steel have confirmed the ability of such an inductor to induce rotation of the metal flowing in a submerged nozzle under casting conditions that are much more severe than those encountered in industrial machines for casting blooms or slabs. These tests were carried out in fact with a nozzle of the straight type (single axial outlet that opens in the bottom) through which the metal flows at a mean speed of around 3.5 to 4.2 m/s, bearing in mind that in a nozzle for casting slabs, the mean output speeds are more between 1.5 and 2.0 m/s.
  • FIG. 1 is a diagram showing, seen in cross section, the inductor formed from two half-shells butted together, provided with its internal heat shield bordering the airgap;
  • FIG. 2 is a diagram similar to the previous one, but intended to show the propagation of the lines of force of the traversing magnetic field in the airgap as frozen at any given instant in the operation of the inductor;
  • FIG. 3 is a functional diagram showing the principle of how the two constituent half-shells of the inductor are articulated
  • FIG. 4 shows the velocity map of the liquid metal rotating within the casting nozzle under the effect of the magnetic field in a cross-sectional plane of the nozzle
  • FIG. 5 shows the variation in the intensity B of the magnetic field in the airgap along a diameter D of the nozzle taken in a plane located at mid-height of the inductor
  • FIG. 6 shows, corresponding to the representation of FIG. 5 , the corresponding variation in the field of magnetic forces F B along a diameter D of the nozzle in a radial profile R and in an orthoradial profile OR.
  • the inductor 1 is a linear motor stator closed on itself, consisting for this purpose of two independent equal semitubular parts 2 a and 2 b (the half-shells).
  • Each half-shell has three wound salient poles 3 , the pole face 4 of which is turned toward the inside, these magnetic poles, made of stacks of soft iron laminations, being conventionally connected together by an external peripheral semitubular yoke 5 a, 5 b.
  • the system is designed so that the two paired yokes butt together in the joining plane J when the inductor is in the closed working position shown in FIGS. 1 and 2 .
  • a cap 7 a, 7 b also of corresponding semitubular shape, covers the inside of the pole faces of each half-shell and forms, once the inductor is in the closed position, a heat shield 7 that closely surrounds the casting nozzle.
  • This heat shield is desirable for the electrical windings 3 of the inductor with regard to the radiation emitted by the casting nozzle 8 shown in FIG. 3 , which channels the stream of molten metal into the mold. Details about the possible construction of this shield will be given later.
  • each wound pole 3 is connected to one phase of a three-phase power supply (not shown) intended to deliver the primary current for the inductor.
  • a three-phase power supply (not shown) intended to deliver the primary current for the inductor.
  • any salient pole of one of the half-shells 2 a diametrically faces a salient pole of the other half-shell 2 b.
  • These two poles form a “pair of poles” in the sense that they are both connected to the same phase of the power supply, but in phase opposition (for example via a different winding direction) so that, at each instant, their active faces are of opposite signs. This condition is necessary so that the magnetic field produced is of the traversing type.
  • the poles 3 and the magnetic flux return yoke 5 a, 5 b are laminations made of oriented-grain Fe—Si sheets with an initial thickness of 0.3 mm so as to minimize hysteresis losses.
  • Their operational height (the height of the active face 4 ) is between 50 mm (the minimum value) and 500 mm, depending on the available space between the tundish and the top of the mold, between which the inductor will be placed.
  • Their inside diameter (the diameter of the airgap) is of the order of the outside diameter of the casting nozzle increased by around ten millimeters, barely enough to maintain a separation but so as to ensure the best possible inductive coupling.
  • the primary windings 6 are formed from a large number (several hundred) turns of copper wire of very small diameter that can support high current densities (>10 A/mm 2 ). They are provided, within them, with water-cooled copper heat sinks (not shown).
  • windings are supplied with three-phase currents of medium frequency ranging from 50 Hz to 600 Hz.
  • medium frequency ranging from 50 Hz to 600 Hz.
  • operating at high frequency above 50 or 60 Hz makes it possible, for constant current intensity, to increase the motor torque that the electromagnetic forces exert on the metal flowing through the nozzle.
  • this option requires the use of a frequency converter unlike operation at the mains frequency (50 or 60 Hz).
  • this static motor that the inductor 1 constitutes can generate, in its airgap occupied by the nozzle, a transverse electromagnetic field (called “traversing” field) of high intensity (between 1000 and 1500 gauss) for low inductor current values (a few tens of amps).
  • a transverse electromagnetic field called “traversing” field
  • This field is virtually uniform in the central portion of the airgap.
  • This essential feature of the invention makes it possible to generate a force field in the liquid metal that decreases uniformly from the wall to the center, as the diagram in FIG. 6 shows. This makes it possible, as the velocity map of FIG. 4 also clearly shows, to induce rotation in the liquid metal with a speed that remains high even in the axial portion of the nozzle.
  • This specific feature is necessary in order to prevent too great a reduced pressure in the central portion of the nozzle where the metal would then have a tendency to “escape” and be subjected to a high downward acceleration, thus canceling out part of the beneficial effect of the rotational movement.
  • this tapering shape of the radial teeth 3 is obtained by a bevel precut 12 of the ends of the laminations to be stacked in order to form them.
  • the bevel angle is to be adjusted according to the outside diameter of the nozzle to be surrounded.
  • the pole face 4 must not have an area less than half the cross section of the tooth 3 and the taper bevel 12 on the body of the tooth can start only at two-thirds of the way along the length. It is unnecessary to start before this, and it is even desirable to start it as late as possible so as to maximize the magnetic mass of the inductor.
  • the intensity of the primary currents may be greatly increased.
  • the proposed technique makes it possible in fact, within a wide primary current range, to very greatly increase the intensity of the electromagnetic field in the airgap, by increasing these currents to values well beyond the threshold current corresponding to magnetic saturation of the yoke 5 . This allows the magnetic field lines to be channeled and the intensity of this magnetic field in the airgap of the motor to be increased to the point where the latter reaches its saturation value in the yoke. Beyond this threshold value, it is the magnetic field generated by the inductor directly in the air that contributes to increasing the intensity of the field in the airgap of the motor.
  • the inductor is very close to the casting nozzle 8 (about 5 mm away from it), the outside temperature of the nozzle being around 1100 to 1200° C. It is therefore thermally protected from the radiation emitted by the nozzle by the thin segmented copper shield 7 that is cooled by water circulation and is transparent to the electromagnetic field thanks to this segmentation.
  • the construction of the inductor 1 as two independent semitubular parts 5 a and 5 b allows it to be easily fitted around the nozzle and removed at any moment without modifying the standard casting process.
  • a support consisting of two arms 9 articulated about a pivot spindle 10 .
  • the arms are driven by cylinders 11 which open and close them and exert a sufficient contact force (of greater than 200 kgf) between the yokes 5 a and 5 b of the two semitubular parts 2 a and 2 b once these are in abutment, as shown in FIG. 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US10/561,067 2003-06-17 2004-06-08 Continuous casting installation for the electromagnetic rotation of molten metal moving inside the nozzle Abandoned US20060124272A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0307307 2003-06-17
FR0307307A FR2856321B1 (fr) 2003-06-17 2003-06-17 Installation de coulee continue pour une mise en rotation electro-magnetique du metal liquide en transit dans la busette de coulee
PCT/FR2004/001418 WO2005002763A2 (fr) 2003-06-17 2004-06-08 Installation de coulee continue pour une mise en rotation electro-magnetique du metal liquide en transit dans la busette de coulee

Publications (1)

Publication Number Publication Date
US20060124272A1 true US20060124272A1 (en) 2006-06-15

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US10/561,067 Abandoned US20060124272A1 (en) 2003-06-17 2004-06-08 Continuous casting installation for the electromagnetic rotation of molten metal moving inside the nozzle

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Country Link
US (1) US20060124272A1 (fr)
EP (1) EP1633512B1 (fr)
JP (1) JP4435781B2 (fr)
KR (1) KR101004065B1 (fr)
CN (1) CN100406165C (fr)
CA (1) CA2529384C (fr)
DE (1) DE602004004270T2 (fr)
ES (1) ES2279430T3 (fr)
FR (1) FR2856321B1 (fr)
PL (1) PL1633512T3 (fr)
SI (1) SI1633512T1 (fr)
WO (1) WO2005002763A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090294091A1 (en) * 2008-05-30 2009-12-03 Jan-Erik Eriksson Continuous Casting Device
CN108421971A (zh) * 2018-01-09 2018-08-21 武汉科技大学 用于连铸中间包出口处的双锯齿状防结瘤装置
EP3363560A1 (fr) * 2017-02-20 2018-08-22 ABB Schweiz AG Procédé et système d'agitation pour commander un agitateur électromagnétique
US11478979B2 (en) * 2018-12-05 2022-10-25 Xerox Corporation Apparatus and method for variable magnetic alignment in fused deposition modeling (FDM) magnets
EP4245437A4 (fr) * 2021-01-04 2024-04-10 Hanjoo Light Metal Co.,Ltd. Dispositif de coulée sous pression à semi-solidification à électro-aimant à deux composants et procédé de fabrication associé

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070052343A (ko) * 2004-09-13 2007-05-21 에너제틱스 테크놀로지스, 엘.엘.씨. 배출 과정에서 턴디쉬 또는 레이들 내에서의 와류 발생을억제하는 방법 및 설비
FR2894167A1 (fr) * 2005-12-06 2007-06-08 Usinor Sa Equipement pour la coulee en repartiteur de coulee continue des metaux
CN103203450A (zh) * 2013-03-20 2013-07-17 河北三方电气设备有限公司 一种连铸用电磁旋流水口
CN103706772A (zh) * 2013-12-20 2014-04-09 鞍钢股份有限公司 一种减缓小铸坯钢水冲击深度装置及方法
CN105268935B (zh) * 2014-06-10 2017-10-20 东北大学 一种两瓣式浸入式水口电磁旋流装置及其支撑装置
WO2015188573A1 (fr) * 2014-06-10 2015-12-17 东北大学 Procédé de coulée continue et dispositif comportant une buse tourbillonnaire électromagnétique
CN105195726A (zh) * 2014-06-11 2015-12-30 鞍钢股份有限公司 一种减缓长水口负压和钢水冲击力的装置及方法
CN104128598B (zh) * 2014-07-30 2016-04-20 河北三方电气设备有限公司 一种连铸用水口管旋流装置
CN114029463A (zh) * 2021-11-25 2022-02-11 山东钢铁股份有限公司 一种解决特殊钢大圆坯偏析的方法

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US4256165A (en) * 1978-06-23 1981-03-17 Mannesmann Aktiengesellschaft Stirring of molten metal core in a casting as withdrawn from a machine for continuous casting
US4321958A (en) * 1979-01-30 1982-03-30 Cem Compagnie Electro-Mecanique Electromagnetic inductor for generating a helical field
US4462458A (en) * 1981-04-03 1984-07-31 Rotelec Societe Anonyme Electromagnetic inductor with a rotating field and apparatus for the continuous casting of metal for its use
US4834168A (en) * 1987-04-13 1989-05-30 Alsthom Device for electromagnetically stirring liquid metal on a continuous casting line

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JPS5671563A (en) * 1979-11-15 1981-06-15 Sumitomo Metal Ind Ltd Continuous casting method
JPS61115654A (ja) * 1984-11-10 1986-06-03 Shinko Electric Co Ltd 連続鋳造装置
JPH0623498A (ja) * 1992-07-10 1994-02-01 Sumitomo Heavy Ind Ltd 連続鋳造における溶鋼供給制御装置
JP3186012B2 (ja) * 1993-09-28 2001-07-11 株式会社神戸製鋼所 連続鋳造用注湯ノズルおよび連続鋳造方法
JPH07108355A (ja) * 1993-10-08 1995-04-25 Kobe Steel Ltd 電磁撹拌装置
JP2000052006A (ja) * 1998-08-13 2000-02-22 Mitsubishi Heavy Ind Ltd 金属片の連続鋳造装置および連続鋳造方法

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US4256165A (en) * 1978-06-23 1981-03-17 Mannesmann Aktiengesellschaft Stirring of molten metal core in a casting as withdrawn from a machine for continuous casting
US4321958A (en) * 1979-01-30 1982-03-30 Cem Compagnie Electro-Mecanique Electromagnetic inductor for generating a helical field
US4462458A (en) * 1981-04-03 1984-07-31 Rotelec Societe Anonyme Electromagnetic inductor with a rotating field and apparatus for the continuous casting of metal for its use
US4834168A (en) * 1987-04-13 1989-05-30 Alsthom Device for electromagnetically stirring liquid metal on a continuous casting line

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090294091A1 (en) * 2008-05-30 2009-12-03 Jan-Erik Eriksson Continuous Casting Device
US8336605B2 (en) * 2008-05-30 2012-12-25 Abb Ab Continuous casting device
EP3363560A1 (fr) * 2017-02-20 2018-08-22 ABB Schweiz AG Procédé et système d'agitation pour commander un agitateur électromagnétique
WO2018149594A1 (fr) * 2017-02-20 2018-08-23 Abb Ab Procédé et système d'agitation permettant de commander un agitateur électromagnétique
US10919088B2 (en) 2017-02-20 2021-02-16 Abb Schweiz Ag Method and stirring system for controlling an electromagnetic stirrer
CN108421971A (zh) * 2018-01-09 2018-08-21 武汉科技大学 用于连铸中间包出口处的双锯齿状防结瘤装置
US11478979B2 (en) * 2018-12-05 2022-10-25 Xerox Corporation Apparatus and method for variable magnetic alignment in fused deposition modeling (FDM) magnets
EP4245437A4 (fr) * 2021-01-04 2024-04-10 Hanjoo Light Metal Co.,Ltd. Dispositif de coulée sous pression à semi-solidification à électro-aimant à deux composants et procédé de fabrication associé

Also Published As

Publication number Publication date
DE602004004270T2 (de) 2007-05-31
EP1633512A2 (fr) 2006-03-15
CA2529384A1 (fr) 2005-01-13
JP2006527661A (ja) 2006-12-07
FR2856321A1 (fr) 2004-12-24
CN1809435A (zh) 2006-07-26
CA2529384C (fr) 2010-03-30
KR101004065B1 (ko) 2010-12-27
ES2279430T3 (es) 2007-08-16
JP4435781B2 (ja) 2010-03-24
SI1633512T1 (sl) 2007-06-30
EP1633512B1 (fr) 2007-01-10
CN100406165C (zh) 2008-07-30
WO2005002763A3 (fr) 2005-03-17
DE602004004270D1 (de) 2007-02-22
WO2005002763A2 (fr) 2005-01-13
PL1633512T3 (pl) 2007-06-29
FR2856321B1 (fr) 2006-05-26
KR20060019594A (ko) 2006-03-03

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