EP0679115B1 - Magnetisches rühren mittels wechselstrom für das kontinuierliche giessen vom metallen - Google Patents
Magnetisches rühren mittels wechselstrom für das kontinuierliche giessen vom metallen Download PDFInfo
- Publication number
- EP0679115B1 EP0679115B1 EP94904542A EP94904542A EP0679115B1 EP 0679115 B1 EP0679115 B1 EP 0679115B1 EP 94904542 A EP94904542 A EP 94904542A EP 94904542 A EP94904542 A EP 94904542A EP 0679115 B1 EP0679115 B1 EP 0679115B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stirring
- magnetic field
- rotating magnetic
- meniscus
- molten metal
- 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.)
- Expired - Lifetime
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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
- B22D11/11—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 the continuous casting of metals and alloys, for example, steel.
- Electromagnetic stirring of liquid steel within the mold is broadly employed in continuous casting mainly to improve quality of the strand surface/sub-surface and solidification structure (i.e., structure refinement, soundness and chemical homogeneity).
- Japanese Patent Publication No. 58-23554 describes a method of decreasing the intensity of stirring in the meniscus region by means of an induction coil arranged on the mold adjacent to that region and providing rotating stirring motion opposite to that induced by the main EMS coil arranged below.
- the main drawback of this method is that the induction coil adjacent to the meniscus region provides only a deceleration of the stirring velocity produced by EMS. In the case when an intensive stirring action within the meniscus region is required, this method would need to relinquish its decelerating action by de-energizing the coil. The coil is not intended to enhance stirring action if the need of such enhancement arises, for the reasons discussed above.
- the depth of meniscus depression h approaches zero when the angular stirring velocity at the meniscus caused by EMS is equalized by counter-stirring angular velocity produced by a braking induction coil.
- EP-A-0 096 077 discloses a plurality of electromagnetic agitations arranged in a horizontal direction along a wall of a mold to accelerate or decelerate the circulatory flow along the flow direction but does not provide a second magnetic field at a location upstream of the stirring by a first rotating magnetic field.
- DE-A-3 819 492 discloses two stirrers, one upon the other, but also discloses only operating one of the stirrers in a casting method.
- EP-A-0 080326 discloses one rotational field only together with an axial field.
- An electromagnetic volume force will be produced in either of two situations, firstly, when an A.C. rotating magnetic field interacts with liquid metal which is in the state of complete rest, the metal will be set into a motion with a velocity lower than that of the A.C. field; and, secondly, when a stationary, i.e. D.C. magnetic field, interacts with liquid metal already in motion.
- an improved method of controlling electromagnetic stirring intensity within a continuous casting mold provides both the flexibility of adaptation of stirring conditions to the casting processes and the accuracy of stirring control which were lacking by prior art.
- an electromagnetic A.C. coil similar to but smaller than that of a main electromagnetic stirrer installed downstream is arranged around the mold in the meniscus area.
- This device is in essence another induction stirrer, similar to the main stirrer which is arranged axially symmetrical around the mold and farther down from the meniscus.
- the coil in the upper part of the mold is intended to counterbalance and equalize, or enhance, depending on specific objectives, the stirring motion in the adjacent volume of liquid metal, the metal motion which is originated by the main stirrer. Therefore, the working function of this stirrer is to modify the pattern and/or intensity of the stirring induced by the main stirrer and henceforth the device performing that function will be called A.C. magnetic stirring modifier or A.C. MSM.
- the action of the A.C. MSM is typically contained within the upper portion of molten metal pool, comprising approximately 10 to 15 percent of its volume confined by the mold.
- both the A.C. MSM and M-EMS operate at a common frequency determined by the parameters of the mold.
- the current supplied to both sets of the coils can be of the same variable value or it can be controlled separately.
- the invention is broadly applicable to all electroconductive materials, i.e. metals and alloys, which can be electromagnetically stirred and where control of stirring intensity is required within some region or regions without interference with stirring within other regions of the liquid pool.
- the invention is applicable to a wide variety of spacial orientation of a vessel containing the molten method.
- a casting mold may be arranged vertically, inclined or horizontally.
- Figure 1 is a schematic depiction of an arrangement of an A.C. MSM and an EMS within a mold housing assembly of a continuous casting machine 10 in accordance with one embodiment of the present invention.
- Figure 5 is a more detailed depiction of the mechanical elements of the mold assembly.
- a series of induction coils 12, is arranged equally spaced around the periphery of a vertical casting mold 14, at its lower portion to comprise an A.C. electromagnetic stirrer (EMS).
- EMS electromagnetic stirrer
- a casting ceramic tube 18 is axially located with respect to the strand of molten metal 16, when casting with a submerged entrance nozzle is being performed.
- A.C. MSM induction coils 20 are equally spaced around the vertical mold 14, adjacent to a free upper surface or meniscus 22 of the strand of molten metal 16.
- the EMS coils 12 are designed to induce a strong rotational flow of molten metal in the strand of molten metal 16 within the mold 14.
- a maximum value of rotational velocity is attained within and about the region of molten metal defined by a characteristic length of stirrer L which corresponds to a magnetic flux density B distribution along stirring axis.
- a typical magnetic flux density distribution for the two sets of induction coils 12 and 20 are shown in Figure 2.
- the value of the maximum stirring velocity within and about the active stirring zone L and the rate of its axial attenuation within the metal 16 determine the stirring velocity at the meniscus area 22 in the absence of other effects.
- the stirring velocity value and its lengthwise axial range depend on the stirrer length L, the radius of the stirred pool R, and the roughness of the solidification interface with liquid metal. Accordingly, it is difficult to quantitatively and accurately predict the stirring velocity at the meniscus, based upon the design and operating parameters of the EMS coils 12 and the distance from EMS neutral axis to the meniscus.
- the stirring velocity at the meniscus generally is about 0.5 to 0.7 (about 50 to 70 percent) of maximum stirring velocity value while the EMS coils 12 are located at a lowest position with respect to the meniscus. Therefore, a substantial stirring action can be expected at the meniscus area produced by the EMS coils even if the latter is located at the farthest possible distance from the meniscus. Meniscus depression and, more generally, turbulence at this location manifest themselves as a result of this stirring action.
- the meniscus depression depth is strongly correlated to the angular stirring velocity at the meniscus.
- the meniscus stirring velocity and depression are proportional to the current supplied to the EMS coils 12, as shown schematically in Figure 3.
- the meniscus depression for industrial systems can range from approximately 6 to 27 mm, for example.
- the induction coils 20 of A.C. MSM are energized, to induce a stirring action within the liquid metal at the meniscus opposite to that caused by the EMS coils 12. All the previous considerations with respect to a rotary movement of liquid metal are applicable to the stirring produced by the A.C. MSM coils 20.
- the A.C. MSM coils 20 are substantially smaller and require less power for their operation than the EMS coils 12 due to a much less stirring velocity expected for them to produce to counteract the rotational motion at the meniscus induced by the EMS coils 12.
- the A.C. MSM coils 20 are energized from a power supply common with the EMS coils 12, as shown by single line diagrams in Figure 4.
- Schemes I and II appearing in Figure 4 show the A.C. MSM and EMS coils 20 and 12 respectively connected in series and, therefore, operating at the time same current and frequency supplied from a common power source.
- the coil connections presented in Scheme I provide for unidirectional rotating magnetic fields produced by both the EMS and A.C. MSM coils. This mode of operation is employed for enhancing the stirring motion at the meniscus area by the A.C. MSM coils 20.
- the coil connections presented in Scheme II provide for counter-rotating magnetic fields and cause counter-rotating liquid metal motions in the areas corresponding to the EMS and A.C. MSM coils.
- the current level supplied to the A.C. MSM coils 20 may have an independent control from that of the EMS coils 12, as shown by Scheme III in Figure 4. This arrangement allows for independent control of stirring actions of either of the EMS or the A.C. MSM coils regardless of the directional pattern of stirring, namely unirotational or counter-rotational.
- the line OA corresponds to the meniscus depression caused by the stirring induced by EMS coils 12 without being opposed or added by A.C. MSM stirring.
- the line OD represents meniscus depression associated with isolated stirring action induced by the A.C. MSM coils 20.
- the meniscus depression In order to equalize the stirring velocities caused by the EMS and A.C. MSM coils, the meniscus depression must be of the same value in either of the situations. For example, if the meniscus depression caused by EMS stirring corresponds to the level A, then counter-rotational stirring provided by A.C. MSM stirring should have corresponding meniscus depression, i.e. level D.
- the line OC is the resultant of two opposite stirring actions produced respectively by the EMS and AC MSM coils and equalized at the meniscus.
- the line AB represents the resultant of two unidirectional stirring actions.
- the range of stirring enhancement expressed through the meniscus depression can be adjusted in accordance with the casting practice requirements, so that the stirring intensity of EMS is fully utilized.
- the present invention provides an improved method of controlling disturbance of the free surface of molten steel or other metal or alloy being cast through a mold and caused by electromagnetic stirring applied to the liquid metal, to minimize such disturbance or achieve an enhanced, within a single casting unit stirring motion at the meniscus, by employing an induction modifier in the form of an electromagnetic stirrer adjacent to the location of the meniscus.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Furnace Details (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Claims (9)
- Induktionsrührverfahren für flüssige Metalle,
gekennzeichnet durch:
elektromagnetisches Induzieren des Rührens von geschmolzenem Metall mit einer Intensität, die normalerweise zu einer Turbulenz in dem geschmolzenen Metall einschließlich seiner freien Oberfläche führt, durch Anlegen eines ersten rotierenden Magnetfeldes an das geschmolzene Metall, und Anlegen eines zweiten rotierenden Magnetfeldes, das von einer von der das erste Magnetfeld erzeugenden Quelle getrennten Quelle erzeugt wird, an einer Stelle stromaufwärts des Rührens, mit einer Intensität, die wahlweise (a) mindestens ausreichend ist, um die Rührbewegung und die Störungen an der freien Oberfläche zu minieren, wenn das zweite rotierende Magnetfeld dem ersten rotierenden Magnetfeld entgegengerichtet ist, oder (b) um die Rührbewegung an der freien Oberfläche zu verstärken, wenn das erste und zweite rotierende Magnetfeld die gleiche Drehrichtung haben. - Verfahren nach Anspruch 1,
bei dem das zweite rotierende Magentfeld an einer Stelle nahe der freien Oberfläche des geschmolzenen Metalls angelegt wird. - Verfahren nach Anspruch 1 oder 2,
bei dem das zweite rotierende Magnetfeld durch einen Satz von Induktionsspulen erzeugt wird, die durch einen Wechselstrom gesteuert werden, der von einer Stromquelle geliefert ist, die auch einer Gruppe von das erste rotierende Magnetfeld erzeugenden Induktionsspulen gemeinsam ist. - Verfahren nach Anspruch 1 oder 2,
bei dem das zweite rotierende Magnetfeld von einem Satz von Induktionsspulen erzeugt wird, die von einem Wechselstrom von einer Stromquelle erzeugt wird, die von einer Stromquelle für einen das erste rotierende Magnetfeld erzeugenden Satz von Induktionsspulen unabhängig ist. - Verfahren nach Anspruch 3 oder 4,
bei dem die Sätze von Induktionsspulen Spulen mit Multiphasen- und Multipol-Anordnung sind, die in Umfangsrichtung beabstandet um den Bereich des geschmolzenen Metalls an der Stelle der Aufbringung des jeweiligen rotierenden Magnetfeldes angeordnet sind. - Verfahren nach einem der Ansprüche 1 bis 5,
bei dem das zweite rotierende Magnetfeld dazu dient, eine Rührbewegung in dem Meniskusbereich zu bewirken, die ausreichend ist, um die Rührbewegung von einer Intensität von etwa 50 bis 70% zu unterdrücken, die von dem ersten rotierenden Magnetfeld an seinem stromabwärts liegenden Aufbringbereich erzeugt wird. - Verfahren nach einem der Ansprüche 1 bis 6,
bei dem das zweite rotierende Magnetfeld dazu dient, eine Rührbewegung in dem Meniskusbereich zu bewirken, die ausreicht, um diese Rührbewegung auf ein Niveau bei oder nahe der ursprünglichen Rührintensität, die von dem ersten rotierenden Magnetfeld an seiner stromabwärts liegenden Aufbringungsstelle erzeugt wird, anzuheben. - Verfahren zum Stranggießen von Metall, bei dem flüssiges Metall in einer vertikal orientierten Stranggießform eingegrenzt und das flüssige Metall mit dem Verfahren gemäß einem der Ansprüche 1 bis 7 gerührt wird, wobei das erste rotierende Magnetfeld an einer stromabwärts liegenden Stelle und das zweite rotierende Magnetfeld an der freien Oberfläche des Flüssigmetalls im vertikalen Abstand von der stromabwärts liegenden Stelle aufgebracht wird.
- Verfahren nach einem der Ansprüche 1 bis 7,
oder Verfahren nach Anspruch 8,
bei dem das flüssige Metall Stahl ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US506293A | 1993-01-15 | 1993-01-15 | |
US5062 | 1993-01-15 | ||
PCT/CA1994/000018 WO1994015739A1 (en) | 1993-01-15 | 1994-01-14 | A.c. magnetic stirring modifier for continuous casting of metals |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0679115A1 EP0679115A1 (de) | 1995-11-02 |
EP0679115B1 true EP0679115B1 (de) | 1997-06-25 |
EP0679115B2 EP0679115B2 (de) | 2004-09-15 |
Family
ID=21713965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94904542A Expired - Lifetime EP0679115B2 (de) | 1993-01-15 | 1994-01-14 | Magnetisches rühren mittels wechselstrom für das kontinuierliche giessen vom metallen |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0679115B2 (de) |
AT (1) | ATE154767T1 (de) |
CA (1) | CA2153995C (de) |
DE (1) | DE69403950T3 (de) |
ES (1) | ES2106501T5 (de) |
WO (1) | WO1994015739A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007028501A1 (de) | 2005-09-07 | 2007-03-15 | Sms Demag Ag | Bauteil für eine stranggiesskokille und verfahren zur herstellung des bauteils |
WO2009117803A1 (en) * | 2008-03-25 | 2009-10-01 | Abb Inc. | Modulated electromagnetic stirring of metals at advanced stage of solidification |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1288900B1 (it) * | 1996-05-13 | 1998-09-25 | Danieli Off Mecc | Procedimento di colata continua con campo magnetico pulsante e relativo dispositivo |
CN103170606B (zh) * | 2011-12-23 | 2015-08-26 | 北京有色金属研究总院 | 双重强制均匀化制备金属浆料的装置及其加工成形方法 |
CN108971460A (zh) * | 2018-08-22 | 2018-12-11 | 上海大学 | 一种脉冲耦合电磁场细化金属凝固组织的方法及装置 |
CN115430828B (zh) * | 2022-09-22 | 2024-07-23 | 济南海圣机电科技有限公司 | 一种浇注机铁水定量定速浇注控制方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT189751B (de) * | 1952-08-27 | 1957-05-10 | Verfahren zum Gießen, insbesondere zum Stranggießen von Metallen | |
AT184313B (de) † | 1953-07-30 | 1956-01-10 | Boehler & Co Ag Geb | Verfahren und Vorrichtung zum kontinuierlichen Gießen, insbesondere von schwer schmelzbaren Metallen |
DE1583601A1 (de) † | 1967-07-05 | 1970-09-17 | Demag Elektrometallurgie Gmbh | Verfahren und Vorrichtung zum Kuehlen eines schmelzfluessigen Metallstranges |
FR2391015A1 (fr) * | 1977-05-18 | 1978-12-15 | Siderurgie Fse Inst Rech | Perfectionnement au procede de coulee continue centrifuge de produits metalliques et dispositif de mise en oeuvre |
EP0080326A1 (de) * | 1981-11-20 | 1983-06-01 | British Steel Corporation | Einrichtung für das Stranggiessen von Stahl |
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 |
JPS5989649U (ja) † | 1982-12-04 | 1984-06-18 | 三菱重工業株式会社 | 連続鋳造用電磁撹拌装置 |
DE3819492A1 (de) * | 1988-06-08 | 1989-12-14 | Voest Alpine Ind Anlagen | Knueppel- bzw. vorblock-stranggiesskokille |
US4933005A (en) * | 1989-08-21 | 1990-06-12 | Mulcahy Joseph A | Magnetic control of molten metal systems |
-
1994
- 1994-01-14 ES ES94904542T patent/ES2106501T5/es not_active Expired - Lifetime
- 1994-01-14 WO PCT/CA1994/000018 patent/WO1994015739A1/en active IP Right Grant
- 1994-01-14 EP EP94904542A patent/EP0679115B2/de not_active Expired - Lifetime
- 1994-01-14 AT AT94904542T patent/ATE154767T1/de not_active IP Right Cessation
- 1994-01-14 DE DE69403950T patent/DE69403950T3/de not_active Expired - Lifetime
- 1994-01-14 CA CA002153995A patent/CA2153995C/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007028501A1 (de) | 2005-09-07 | 2007-03-15 | Sms Demag Ag | Bauteil für eine stranggiesskokille und verfahren zur herstellung des bauteils |
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 |
Also Published As
Publication number | Publication date |
---|---|
EP0679115B2 (de) | 2004-09-15 |
DE69403950D1 (de) | 1997-07-31 |
ES2106501T5 (es) | 2005-03-01 |
CA2153995A1 (en) | 1994-07-21 |
ATE154767T1 (de) | 1997-07-15 |
CA2153995C (en) | 2000-11-07 |
EP0679115A1 (de) | 1995-11-02 |
ES2106501T3 (es) | 1997-11-01 |
DE69403950T3 (de) | 2005-03-10 |
WO1994015739A1 (en) | 1994-07-21 |
DE69403950T2 (de) | 1997-12-11 |
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