WO2002000374A1 - Method and device for continu0us casting of metals in a mold - Google Patents
Method and device for continu0us casting of metals in a mold Download PDFInfo
- Publication number
- WO2002000374A1 WO2002000374A1 PCT/SE2001/001498 SE0101498W WO0200374A1 WO 2002000374 A1 WO2002000374 A1 WO 2002000374A1 SE 0101498 W SE0101498 W SE 0101498W WO 0200374 A1 WO0200374 A1 WO 0200374A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- induction coil
- melt
- current
- mold
- stirring
- Prior art date
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
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.
- 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. Patent 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 re- gion.
- 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 unaf- fected by the A.C. magnetic field produced by the upper induction coil.
- 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 1 1 .
- 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.
- Such braking intensity is sufficient in many in- stances of the submerged pour casting practice and for the casting through metering nozzle.
- the further reduction of stirring velocity is achieved by applying an A.C. magnetic field. Switching current from A.C. to D.C.
- 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.
- this invention brings significant improvements in flexibility of controlling stirring velocity and tur- bulence at the meniscus and results in an increased effectiveness of metallurgical performance and efficiency of the stirring system.
- 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 re- gions 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 connec- tions 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
- 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 moJd 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.
- 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 1 1 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 second induction coil 3 is energized by D.C. current so as to produce a horizontally directed D.C. magnetic field, which induces electromagnetic forces in the melt 7 opposing the direction of fluid flows, in transversal as well as longitudinal spatial planes of the mold 1 , in the region of the melt adjacent to the upper free surface 5 of the melt, the magnetic field produced by the second induction coil 3 thereby reducing the velocity of the stirring motion induced in the region of the melt adjacent to the upper free surface 5 of the melt by the first induction coil 4, the velocity of longitudinal flows produced in the melt 7 by the stirring action of the first induction coil 4 as well as longitudinal flows produced by continuously discharging melt into the mold 1 .
- the desired mode of operation is selected among the above- mentioned modes depending upon the casting process em- ployed.
- 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
- 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
- B is the magnetic flux density
- R is the stirring pool radius
- L is the length of stirrer iron yoke.
- the independent control of stirring motion at the meniscus 5 provided by the interchangeable use of A.C. or D.C. current for energizing the second induction coil 3 enables a greater flexibility and accuracy of the stirring process control as well as control of turbulence in the meniscus region caused by longitudinal fluid flows introduced by the first induction coil 4, pouring stream, indicated at 18 in Fig 1 , and oscillating motion of the mold 1 .
- 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 stir- ring 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.
- the invention is of course not in any way restricted to the preferred embodiments described above, but many possibilities to modifications thereof will be apparent to a man with ordinary skill in the art without departing from the basic idea of the invention such as defined in the appended claims.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002505144A JP4831917B2 (en) | 2000-06-27 | 2001-06-27 | Method and apparatus for continuous casting of metal using mold |
US10/311,696 US20030106667A1 (en) | 2000-06-27 | 2001-06-27 | Method and device for continuous casting of metals in a mold |
AU2001267977A AU2001267977A1 (en) | 2000-06-27 | 2001-06-27 | Method and device for continu0us casting of metals in a mold |
EP01945868A EP1303370A1 (en) | 2000-06-27 | 2001-06-27 | Method and device for continu0us casting of metals in a mold |
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 (en) | 2000-06-27 | 2000-06-27 | Method and apparatus for continuous casting of metals |
SE0002459-6 | 2000-06-27 |
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 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002000374A1 true WO2002000374A1 (en) | 2002-01-03 |
Family
ID=20280309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2001/001498 WO2002000374A1 (en) | 2000-06-27 | 2001-06-27 | Method and device for continu0us casting of metals in a mold |
Country Status (9)
Country | Link |
---|---|
US (1) | US20030106667A1 (en) |
EP (1) | EP1303370A1 (en) |
JP (1) | JP4831917B2 (en) |
KR (1) | KR20030036247A (en) |
CN (1) | CN1293965C (en) |
AU (1) | AU2001267977A1 (en) |
RU (1) | RU2266798C2 (en) |
SE (1) | SE519840C2 (en) |
WO (1) | WO2002000374A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100371108C (en) * | 2003-10-27 | 2008-02-27 | 罗泰莱克公司 | Electromagnetic agitation method for continuous casting of metal products having an elongate section |
EP2268431A4 (en) * | 2008-03-25 | 2017-07-12 | ABB Inc. | Modulated electromagnetic stirring of metals at advanced stage of solidification |
Families Citing this family (18)
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KR101129500B1 (en) * | 2004-11-09 | 2012-03-28 | 주식회사 포스코 | Fluid Control Device and the Method Using Electro-Magnetic Braking Principle |
FR2893868B1 (en) * | 2005-11-28 | 2008-01-04 | Rotelec Sa | ADJUSTING THE ELECTROMAGNETIC BREWING MODE ON THE HEIGHT OF A CONTINUOUS CASTING LINGOTIERE |
JP4859661B2 (en) * | 2006-12-27 | 2012-01-25 | 財団法人電力中央研究所 | Electromagnetic stirring device |
DE102007037340B4 (en) | 2007-08-03 | 2010-02-25 | Forschungszentrum Dresden - Rossendorf E.V. | Method and device for the electromagnetic stirring of electrically conductive liquids |
DE102007038281B4 (en) | 2007-08-03 | 2009-06-18 | Forschungszentrum Dresden - Rossendorf E.V. | Method and device for the electromagnetic stirring of electrically conductive liquids |
DE102007059919A1 (en) * | 2007-11-26 | 2009-05-28 | Sms Demag Ag | Method and device for Vergleichmäßigen the solidification process of a particular in strand or strip casting produced molten metal |
DE102010041061B4 (en) | 2010-09-20 | 2013-10-24 | Forschungsverbund Berlin E.V. | Crystallization plant and crystallization process for producing a block from a material whose melt is electrically conductive |
CN103162550B (en) * | 2011-12-09 | 2016-01-20 | 北京有色金属研究总院 | A kind for the treatment of apparatus and method of casting use metal bath |
CN102642013A (en) * | 2011-12-30 | 2012-08-22 | 洛阳理工学院 | Method and device for improving quality of high-temperature alloy master alloy ingot by applying compound electromagnetic field |
CN102528002A (en) * | 2011-12-30 | 2012-07-04 | 洛阳理工学院 | Process and device for high-temperature alloy fine-grain casting with composite electromagnetic fields |
US10197335B2 (en) | 2012-10-15 | 2019-02-05 | Apple Inc. | Inline melt control via RF power |
CA3178979A1 (en) | 2014-05-21 | 2015-11-26 | Novelis Inc. | Non-contacting molten metal flow control |
CN105935751A (en) * | 2016-07-05 | 2016-09-14 | 湖南中科电气股份有限公司 | Multifunctional multi-mode electromagnetic flow control device of slab continuous casting crystallizer |
EP3415251A1 (en) | 2017-06-16 | 2018-12-19 | ABB Schweiz AG | Electromagnetic brake system and method of controlling an electromagnetic brake system |
EP3760337A4 (en) * | 2018-02-26 | 2021-07-14 | Nippon Steel Corporation | Molding facility |
CN108515153B (en) * | 2018-05-03 | 2020-02-04 | 燕山大学 | Composite magnetic field spiral electromagnetic stirring device |
CN111151182A (en) * | 2018-11-07 | 2020-05-15 | 中国科学院大学 | Method and device for driving and transporting low-conductivity liquid by using high-frequency traveling wave magnetic field |
RU2743437C1 (en) * | 2020-04-30 | 2021-02-18 | Общество с ограниченной ответственностью "Научно-производственный центр магнитной гидродинамики" | Device for electromagnetic mixing of liquid core of ingot in crystallizer |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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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 |
WO1999030856A1 (en) * | 1997-12-17 | 1999-06-24 | Rotelec S.A. | Electromagnetic braking device for a smelting metal in a continuous casting installation |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4446909A (en) * | 1981-02-20 | 1984-05-08 | Olin Corporation | Process and apparatus for electromagnetic casting of multiple strands having individual head control |
JP2839637B2 (en) * | 1990-05-07 | 1998-12-16 | 新日本製鐵株式会社 | Continuous casting equipment for molten metal |
JPH04327346A (en) * | 1991-04-30 | 1992-11-16 | Kawasaki Steel Corp | Tundish having coil device for generating shifiting magnetic field |
JPH0671403A (en) * | 1992-08-28 | 1994-03-15 | Nippon Steel Corp | Controller for fluid of molten steel in continuous casting mold |
JP2779344B2 (en) * | 1995-06-07 | 1998-07-23 | ジェイ. マルカヒー エンタープライズイズ, ア ディヴィジョン オブ インバーパワー コントロールズ リミテッド | Method and apparatus for controlling stirring in continuous casting of metal |
DE19542211B4 (en) * | 1995-11-13 | 2005-09-01 | Sms Demag Ag | Electromagnetic stirring device for a slab casting mold |
JP3437895B2 (en) * | 1996-07-22 | 2003-08-18 | 新日本製鐵株式会社 | Flow controller for molten metal |
JPH11156502A (en) * | 1997-12-01 | 1999-06-15 | Kawasaki Steel Corp | Equipment and method for controlling molten steel flow in mold, in continuous casting |
-
2000
- 2000-06-27 SE SE0002459A patent/SE519840C2/en not_active IP Right Cessation
-
2001
- 2001-06-27 WO PCT/SE2001/001498 patent/WO2002000374A1/en not_active Application Discontinuation
- 2001-06-27 EP EP01945868A patent/EP1303370A1/en not_active Withdrawn
- 2001-06-27 US US10/311,696 patent/US20030106667A1/en not_active Abandoned
- 2001-06-27 RU RU2003101963/02A patent/RU2266798C2/en active
- 2001-06-27 AU AU2001267977A patent/AU2001267977A1/en not_active Abandoned
- 2001-06-27 CN CNB018147992A patent/CN1293965C/en not_active Expired - Lifetime
- 2001-06-27 KR KR1020027017714A patent/KR20030036247A/en not_active Application Discontinuation
- 2001-06-27 JP JP2002505144A patent/JP4831917B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
WO1999030856A1 (en) * | 1997-12-17 | 1999-06-24 | Rotelec S.A. | Electromagnetic braking device for a smelting metal in a continuous casting installation |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100371108C (en) * | 2003-10-27 | 2008-02-27 | 罗泰莱克公司 | Electromagnetic agitation method for continuous casting of metal products having an elongate section |
EP2268431A4 (en) * | 2008-03-25 | 2017-07-12 | ABB Inc. | Modulated electromagnetic stirring of metals at advanced stage of solidification |
Also Published As
Publication number | Publication date |
---|---|
JP4831917B2 (en) | 2011-12-07 |
SE0002459L (en) | 2001-12-28 |
US20030106667A1 (en) | 2003-06-12 |
EP1303370A1 (en) | 2003-04-23 |
KR20030036247A (en) | 2003-05-09 |
JP2004501770A (en) | 2004-01-22 |
AU2001267977A1 (en) | 2002-01-08 |
CN1449313A (en) | 2003-10-15 |
RU2266798C2 (en) | 2005-12-27 |
SE519840C2 (en) | 2003-04-15 |
SE0002459D0 (en) | 2000-06-27 |
CN1293965C (en) | 2007-01-10 |
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