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US20030106667A1 - Method and device for continuous casting of metals in a mold - Google Patents

Method and device for continuous casting of metals in a mold Download PDF

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Publication number
US20030106667A1
US20030106667A1 US10/311,696 US31169602A US2003106667A1 US 20030106667 A1 US20030106667 A1 US 20030106667A1 US 31169602 A US31169602 A US 31169602A US 2003106667 A1 US2003106667 A1 US 2003106667A1
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US
United States
Prior art keywords
induction coil
melt
current
mold
stirring
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
US10/311,696
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English (en)
Inventor
Leonid Beitelman
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.)
ABB Group Services Center AB
Original Assignee
ABB Group Services Center 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 Group Services Center AB filed Critical ABB Group Services Center AB
Assigned to ABB GROUP SERVICES CENTER AB reassignment ABB GROUP SERVICES CENTER AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BEITELMAN, LEONID
Publication of US20030106667A1 publication Critical patent/US20030106667A1/en
Priority to US11/230,535 priority Critical patent/US7237597B2/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
    • 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

Definitions

  • the present invention relates to a method and a device for continuous or semi-continuous casting of metals and alloys, e.g. steel, in a casting mold which is open in both ends in the casting direction.
  • FIG. 1 Another known method in prior art with the objective to control stirring motion in the meniscus region is a dual-coil EMS system operating with A.C. current and described in the U.S. Pat. No. 5,699,850.
  • an induction coil arranged in the upper part of the mold in the meniscus region is energized from a current source independent from the current source of the main stirrer arranged in a lower portion of the mold.
  • a rotating A.C. magnetic field produced by the upper induction coil is independently controlled with respect to the magnetic field of the main stirrer.
  • stirring velocity in the meniscus region increases. This velocity increase can be controlled by the current input to the upper coil.
  • the upper stirrer becomes a magnetic brake with respect to the stirring flow in the meniscus region.
  • stirring velocity in the meniscus region can be controlled within a range from its original value when there is no braking action applied, to virtual zero, when magnetic torque of the brake is in balance with the angular momentum of stirring flow in the meniscus region.
  • the braking action has an effect only on the azimuthal component of the fluid flows induced by stirring or by the impact of pouring stream discharging into the mold.
  • the longitudinal component of these flows remains unaffected by the A.C. magnetic field produced by the upper induction coil.
  • These longitudinal fluid flows depending on their intensity, produce a significant turbulence to the melt at the meniscus and in the region adjacent to the meniscus, therefore affecting operating conditions of casting practice and product quality.
  • the object of the present invention is to provide a more flexible control of stirring velocity and melt flow, i.e. liquid metal flow, in the meniscus region of the melt in a mold of continuous casters used for the production of e.g. billets and blooms.
  • the object of the invention is achieved by a device having the characteristics of claim 1, a method having the characteristics of claim 7 and a method having the characteristics of claim 11.
  • the upper induction coil here denominated “the second induction coil” of a dual-coil stirring system is energized either by D.C. or A.C. current depending on the desired effect on the stirring motion of the melt in the region adjacent to the upper free surface of the melt, whereas the main induction coil, here denominated “the first induction coil”, is always operating as a stirrer energized A.C. current, i.e. producing an A.C. magnetic field.
  • the second induction coil is preferably energized by A.C. current from an independent source with respect to the main stirrer, i.e. with respect to the first induction coil.
  • A.C. current is also used to energize the upper induction coil when a full or nearly full reduction of stirring velocity at the meniscus is required with the submerged pour casting practice.
  • a partial reduction of stirring velocity at the meniscus can be achieved by applying horizontal DC magnetic field.
  • Such a partial braking action is required with the casting utilizing either metering nozzle or submerged entry nozzle and stirring velocity at the meniscus is needed to be controlled within a range of up to 60 or 50 percent of its original value.
  • D.C. current is used in order to energize the upper induction coil.
  • A.C. magnetic field is applied at high levels of stirring intensity.
  • Fluid flows in the meniscus region arising from stirring produced by the main stirrer, discharging stream of liquid metal, and/or movement of the mold will interact with the horizontal D.C. magnetic field produced by the upper induction coil.
  • the horizontal D.C. magnetic field and the fluid flows crossing the magnetic field at any angle different from 0 degrees magnetic forces will arise and impede motion of these flows.
  • the maximum interaction is reached at a 90 degree angle between the magnetic field and fluid flow.
  • velocity of stirring motion and longitudinal flows, including discharging straight down pouring stream will be reduced. Turbulence in the meniscus will thus be reduced, resulting in improved meniscus stability, process operating conditions and cast product quality.
  • the invention is a further improvement of the method and the apparatus of dual-coil stirring system.
  • This invention is broadly applicable to all electroconductive materials, i.e. metals and alloys, which can be stirred electromagnetically and where control of stirring motion is required within some region or regions with minimal if any at interference with stirring motion of other regions of the liquid metal columns.
  • the invention is applicable to a wide variety of special orientations of casting mold.
  • the mold can be arranged vertically, horizontally or inclined.
  • FIG. 1 discloses schematically a dual-coil stirring system with respect to a casting mold in accordance with one embodiment of the invention
  • FIG. 2 is a single-line diagram of possible electrical connections for the induction coils of a device according to an embodiment of the invention
  • FIG. 3 is a graphical representation of the relationship between current of a DC magnetic brake and stirring velocity at the meniscus and in the mid-plane of an electromagnetic stirrer in a column of mercury, and
  • FIG. 4 is a graphic representation of the axial profiles of measured stirring velocity in a mercury pool of square cross section for a dual-coil EMS system operating with and without an A.C. and D.C. magnetic field brake.
  • FIG. 1 discloses a device for continuous or semi-continuous casting of metals according to an embodiment of the invention.
  • the device comprises a casting mold 1 , which is open in both ends in the casting direction, and means 2 for supplying hot melt 7 to the mold.
  • the device is provided with a dual-coil electromagnetic stirring (EMS) system, comprising a first induction coil 4 and a second induction coil 3 .
  • the second induction coil 3 is arranged at the top end of the mold, upstream of the first induction coil 4 . Consequently, the first induction coil 4 is arranged downstream of the second induction coil 3 .
  • the first induction coil 4 is operating as a stirrer and is energized by A.C. current producing an A.C. magnetic field.
  • the first induction coil 4 constitutes an A.C. electromagnetic stirrer and is designed, when energized, to induce a rotary motion about the longitudinal axle of the mold 1 to the molten metal 7 within the mold 1 .
  • the melt is supplied to the mold by means of a casting tube 2 which opens out below the upper surface of the melt, the meniscus 5 . It is of course also possible to utilize other types of means for supplying melt to the mold 1 .
  • the second induction coil 3 is interchangeably energized by either D.C. or A.C. current depending on the desired effect on the stirring motion of the melt in the region adjacent to the upper free surface 5 of the melt.
  • the device is preferrably provided with means 12 , schematically indicated in FIG. 2, for switching the current to the second induction coil 3 from A.C. to D.C. and vice versa. Switching current from A.C. to D.C. and vice versa is preferably accomplished by electronic and programming means 12 , which constitute a part of the system power supply.
  • the second induction coil 3 is preferably energized by A.C. current from an independent source with respect to the first induction coil 4 .
  • a first power source 10 is provided for supplying A.C. current to the first induction coil 4
  • a second power source 11 is provided for interchangeably supplying A.C. and D.C. current to the second induction coil 3 .
  • Said first and second power sources are schematically indicated in FIG. 2.
  • the means for switching current from A.C. to D.C. and vice versa are schematically indicated at 12 in FIG. 2. Consequently, either A.C. or D.C. current can be selected to energize the second coil 3 .
  • This arrangement allows for independent control of stirring actions of either of the first or the second induction coils, regardless of directional pattern of stirring produced by the first induction coil 4 .
  • the first induction coil 4 comprises a series of coils 8 arranged around the periphery of the casting mold 1 . These coils 8 are preferably of multi-phase and multi-pole arrangement. It is also preferred that the second induction coil 3 comprises a series of coils 9 arranged around the periphery of the casting mold 1 . These coils 9 are preferably also of multi-phase and multi-pole arrangement.
  • the second induction coil 3 is capable of providing at least three different modes of operation, namely
  • the desired mode of operation is selected among the above-mentioned modes depending upon the casting process employed.
  • the desired effect of the second induction coil 3 on the stirring motion of the melt in the region adjacent to the meniscus 5 varies with the type of casting process employed.
  • the second induction coil 3 is energized either by D.C. or A.C. current in order to produce a braking action in the mold meniscus region for improvement of stirring motion control.
  • a metallurgical effectiveness of the EMS system is achieved.
  • Braking action performed with A.C. magnetic field may control stirring velocity at the meniscus within a wide range including virtual zero velocity.
  • the negative impact produced by the braking on stirring motion in the mold bulk is such that stirring velocity in this region can be reduced by as much as 20 percent.
  • Providing the braking action by a horizontal D.C. magnetic field can control stirring velocity in the meniscus region within the range of up to 50 percent of the velocity original value without affecting stirring motion in the mold bulk. This is sufficient for most of the requirements of the continuous casting steel practice with submerged pouring.
  • the braking action originated from the interaction between a horizontal D.C. magnetic field produced by the second induction coil 3 and rotating stirring flow in the meniscus region is mostly confined within the boundaries between the meniscus and the bottom end of the magnetic brake.
  • the stirring motion within the mold bulk produced by the main stirrer, i.e. the first induction coil 4 remains practically unaffected by the braking action in the meniscus region produced by a horizontal D.C. magnetic field.
  • the intensity of the rotational flow in the melt 7 is characterized by its rotational (angular) velocity U which, in turn, depends on the parameters of the magnetic torque and its spatial distribution within the melt, and the size and geometry of the mold cross-section.
  • U rotational (angular) velocity
  • the magnetic torque can be defined in accordance with the following expression:
  • T is the magnetic torque produced by a 2-phase or 3-phase A.C. magnetic field
  • f is the current frequency
  • ⁇ is the liquid metal electrical conductivity
  • R is the stirring pool radius
  • L is the length of stirrer iron yoke.
  • J is the induced current density within the melt
  • U is the velocity of the melt flow
  • E is the electric potential.
  • FIGS. 3 and 4 show that stirring velocity at the mid-plane of the EMS was approximately 11.7 rad/s or 86% of the original value of 13.6 rad/s when stirring velocity at the meniscus was reduced by the D.C. brake to 2.7 rad/s.
  • the present invention provides an improved method of controlling liquid metal motion in both horizontal and longitudinal directions within the mold meniscus region.
  • the longitudinal component of liquid metal motion induced by the main EMS and by other means, such as the pouring stream of liquid metal discharging into the mold will be minimized by employing induction coils in the form of the stirrer modifier, i.e. the second induction coil, arranged around the melt meniscus region and energized by D.C. electric current, whereas more complete control of stirring velocity, i.e. its azimuthal component, is achieved by using A.C. magnetic field produced by the stirrer modifier.
  • induction coil as used in this description and the appended claims, also embraces an induction coil comprising several individual coils, as illustrated in FIG. 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US10/311,696 2000-06-27 2001-06-27 Method and device for continuous casting of metals in a mold Abandoned US20030106667A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/230,535 US7237597B2 (en) 2001-06-27 2005-09-21 Method and device for continuous casting of metals in a mold

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0002459A SE519840C2 (sv) 2000-06-27 2000-06-27 Förfarande och anordning för kontinuerlig gjutning av metaller
PCT/SE2001/001498 WO2002000374A1 (en) 2000-06-27 2001-06-27 Method and device for continu0us casting of metals in a mold

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/230,535 Division US7237597B2 (en) 2001-06-27 2005-09-21 Method and device for continuous casting of metals in a mold

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US20030106667A1 true US20030106667A1 (en) 2003-06-12

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US10/311,696 Abandoned US20030106667A1 (en) 2000-06-27 2001-06-27 Method and device for continuous casting of metals in a mold

Country Status (9)

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US (1) US20030106667A1 (ru)
EP (1) EP1303370A1 (ru)
JP (1) JP4831917B2 (ru)
KR (1) KR20030036247A (ru)
CN (1) CN1293965C (ru)
AU (1) AU2001267977A1 (ru)
RU (1) RU2266798C2 (ru)
SE (1) SE519840C2 (ru)
WO (1) WO2002000374A1 (ru)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009018809A1 (de) 2007-08-03 2009-02-12 Forschungszentrum Dresden-Rossendorf E.V. Verfahren und einrichtung zum elektromagnetischen rühren von elektrisch leitenden flüssigkeiten
WO2009018810A1 (de) 2007-08-03 2009-02-12 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und eintrichtung zum elektromagnetischen rühren von elektrisch leitenden flüssigkeiten
US20090242165A1 (en) * 2008-03-25 2009-10-01 Beitelman Leonid S Modulated electromagnetic stirring of metals at advanced stage of solidification
DE102010041061A1 (de) 2010-09-20 2012-03-22 Forschungsverbund Berlin E.V. Kristallisationsanlage und Kristallisationsverfahren zur Herstellung eines Blocks aus einem Material, dessen Schmelze elektrisch leitend ist

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FR2861324B1 (fr) * 2003-10-27 2007-01-19 Rotelec Sa Procede de brassage electromagnetique pour la coulee continue de produits metalliques de section allongee
KR101129500B1 (ko) * 2004-11-09 2012-03-28 주식회사 포스코 전자기 제동 원리를 이용한 유동 제어 장치 및 그 방법
FR2893868B1 (fr) * 2005-11-28 2008-01-04 Rotelec Sa Reglage du mode de brassage electromagnetique sur la hauteur d'une lingotiere de coulee continue
JP4859661B2 (ja) * 2006-12-27 2012-01-25 財団法人電力中央研究所 電磁撹拌装置
DE102007059919A1 (de) * 2007-11-26 2009-05-28 Sms Demag Ag Verfahren und Vorrichtung zum Vergleichsmäßigen des Erstarrungsvorganges eines insbesondere beim Strang- oder Bandgießen erzeugten schmelzflüssigen Metalles
CN103162550B (zh) * 2011-12-09 2016-01-20 北京有色金属研究总院 一种铸造用金属熔体的处理装置及方法
CN102528002A (zh) * 2011-12-30 2012-07-04 洛阳理工学院 一种施加复合电磁场的高温合金细晶铸造工艺方法和装置
CN102642013A (zh) * 2011-12-30 2012-08-22 洛阳理工学院 施加复合电磁场改善高温合金母合金锭质量的方法和装置
US10197335B2 (en) * 2012-10-15 2019-02-05 Apple Inc. Inline melt control via RF power
CN111347018B (zh) * 2014-05-21 2022-03-11 诺维尔里斯公司 非接触式熔融金属流动控制
CN105935751A (zh) * 2016-07-05 2016-09-14 湖南中科电气股份有限公司 多功能多模式板坯连铸结晶器电磁控流装置
EP3415251A1 (en) * 2017-06-16 2018-12-19 ABB Schweiz AG Electromagnetic brake system and method of controlling an electromagnetic brake system
WO2019164004A1 (ja) * 2018-02-26 2019-08-29 日本製鉄株式会社 鋳型設備
CN108515153B (zh) * 2018-05-03 2020-02-04 燕山大学 一种复合磁场螺旋电磁搅拌装置
CN111151182A (zh) * 2018-11-07 2020-05-15 中国科学院大学 利用高频行波磁场驱动和输运低电导率液体的方法和装置
RU2743437C1 (ru) * 2020-04-30 2021-02-18 Общество с ограниченной ответственностью "Научно-производственный центр магнитной гидродинамики" Устройство для электромагнитного перемешивания жидкой сердцевины слитка в кристаллизаторе
CN112091190A (zh) * 2020-09-23 2020-12-18 湖南科美达电气股份有限公司 一种高拉速连铸机电磁冶金设备

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US4446909A (en) * 1981-02-20 1984-05-08 Olin Corporation Process and apparatus for electromagnetic casting of multiple strands having individual head control
US4933005A (en) * 1989-08-21 1990-06-12 Mulcahy Joseph A Magnetic control of molten metal systems
US5699850A (en) * 1993-01-15 1997-12-23 J. Mulcahy Enterprises Inc. Method and apparatus for control of stirring in continuous casting of metals

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009018809A1 (de) 2007-08-03 2009-02-12 Forschungszentrum Dresden-Rossendorf E.V. Verfahren und einrichtung zum elektromagnetischen rühren von elektrisch leitenden flüssigkeiten
WO2009018810A1 (de) 2007-08-03 2009-02-12 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und eintrichtung zum elektromagnetischen rühren von elektrisch leitenden flüssigkeiten
DE102007037340A1 (de) 2007-08-03 2009-02-19 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und Einrichtung zum elektromagnetischen Rühren von elektrisch leitenden Flüssigkeiten
DE102007038281A1 (de) 2007-08-03 2009-02-19 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und Einrichtung zum elektromagnetischen Rühren von elektrisch leitenden Flüssigkeiten
DE102007038281B4 (de) * 2007-08-03 2009-06-18 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und Einrichtung zum elektromagnetischen Rühren von elektrisch leitenden Flüssigkeiten
DE102007037340B4 (de) * 2007-08-03 2010-02-25 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und Einrichtung zum elektromagnetischen Rühren von elektrisch leitenden Flüssigkeiten
US8944142B2 (en) 2007-08-03 2015-02-03 Helmholtz-Zentrum Dresden-Rossendorf E.V. Method and device for the electromagnetic stirring of electrically conductive fluids
US20090242165A1 (en) * 2008-03-25 2009-10-01 Beitelman Leonid S Modulated electromagnetic stirring of metals at advanced stage of solidification
WO2009117803A1 (en) * 2008-03-25 2009-10-01 Abb Inc. Modulated electromagnetic stirring of metals at advanced stage of solidification
RU2453395C1 (ru) * 2008-03-25 2012-06-20 Абб Инк. Модулированное электромагнитное перемешивание металлов на поздней стадии затвердевания
DE102010041061A1 (de) 2010-09-20 2012-03-22 Forschungsverbund Berlin E.V. Kristallisationsanlage und Kristallisationsverfahren zur Herstellung eines Blocks aus einem Material, dessen Schmelze elektrisch leitend ist
WO2012038432A1 (de) 2010-09-20 2012-03-29 Forschungsverbund Berlin E.V. Kristallisationsanlage und kristallisationsverfahren zur herstellung eines blocks aus einem material, dessen schmelze elektrisch leitend ist

Also Published As

Publication number Publication date
AU2001267977A1 (en) 2002-01-08
EP1303370A1 (en) 2003-04-23
SE0002459D0 (sv) 2000-06-27
KR20030036247A (ko) 2003-05-09
CN1449313A (zh) 2003-10-15
SE0002459L (sv) 2001-12-28
WO2002000374A1 (en) 2002-01-03
RU2266798C2 (ru) 2005-12-27
SE519840C2 (sv) 2003-04-15
JP2004501770A (ja) 2004-01-22
CN1293965C (zh) 2007-01-10
JP4831917B2 (ja) 2011-12-07

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