EP0774313A1 - Electromagnetic stirring device for a slab caster mould - Google Patents
Electromagnetic stirring device for a slab caster mould Download PDFInfo
- Publication number
- EP0774313A1 EP0774313A1 EP96117372A EP96117372A EP0774313A1 EP 0774313 A1 EP0774313 A1 EP 0774313A1 EP 96117372 A EP96117372 A EP 96117372A EP 96117372 A EP96117372 A EP 96117372A EP 0774313 A1 EP0774313 A1 EP 0774313A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- mould
- electromagnetic
- side walls
- stirring device
- 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.)
- Withdrawn
Links
- 238000003756 stirring Methods 0.000 title claims description 17
- 238000005266 casting Methods 0.000 claims abstract description 9
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims abstract description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005669 field effect Effects 0.000 claims description 2
- 239000000161 steel melt Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 230000006978 adaptation Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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 invention relates to an electromagnetic stirring device for a continuous slab casting mold, wherein a steel melt introduced into the mold by an immersion spout is selectively subjected to different electromagnetic fields by electromagnetic coils.
- the electromagnetic coils are optionally supplied with alternating current or direct current in order to bring about an electromagnetic stirring or braking of the molten steel and thus to improve the quality of the cast slab.
- An electromagnetic stirring device is known from US Pat. No. 3,153,820, electromagnets being able to be operated continuously, successively, with variable frequencies and / or phase relationships in order to generate stirring forces of different intensities. These measures also serve to improve quality.
- the object of the invention is to provide a stirring device of the above type with a more diverse stirring program compared to the known devices for better adaptation to different steel qualities and operating situations of a continuous casting plant.
- the melt distribution should be improved during pouring and slow pouring, the inner quality should be increased and the bath level should be calmed down during fast pouring.
- the object is achieved according to the invention in that the electromagnetic coils arranged along the broad side walls of the slab mold are circumferential in the field effects, are directed at the narrow side walls on both sides of the mold center, are opposite to the mold center or can be subjected to static electricity.
- the current applied to the stirring coils is advantageously electronically controlled by a continuous casting process computer.
- a continuous slab casting mold 1 shown schematically in FIG. 1 consists of two broad side walls 2 and two narrow side walls 3.
- the continuous slab casting mold 1 is fed with molten steel through an immersion pouring tube 4.
- the pouring jets emerging from the lateral outflow openings are illustrated by arrows 5.
- electromagnetic stirring coils 6a, 6b, 7a, 7b are arranged along the broad side walls, which are supplied with electrical current in different ways by means of an electronic control for adaptation to the respective casting program and the respective operating situation.
- the stirring coils 6a, 6b assigned to a broad side wall 2 are supplied with current in the sense of a continuous traveling field 8.
- the stirring coils 7a, 7b assigned to the other broad side wall are acted upon in order to achieve a circulating flow in the sense of an opposite traveling field 9.
- This type of stirring serves to improve the degree of purity and the surface quality at the intended casting speed.
- the stirring coils 6a, 6b and 7a, 7b arranged on both sides of the mold center are acted upon differently in the sense opposite to the magnetic fields 10 running opposite the narrow side walls.
- these magnetic fields which accelerate the pouring streams 5
- an optimal distribution of the molten steel in a mold for wide slabs is achieved at the start of casting and at a slow casting speed.
- the stirring coils 6a, 6b and 7a, 7b arranged on both sides of the mold center are acted upon differently to produce magnetic field effects directed against the mold center (pouring tube position).
- traveling fields 11 which act as a brake against the pouring streams 5
- the bath level is calmed at a higher pouring rate and thus an improvement in the surface quality of the slab is achieved.
- an error reduction is achieved by accelerated separation of inclusions upwards.
- the coils 6, 7 are acted upon by direct current, the static magnetic fields 12 then achieving a braking effect on the melt, which is highly turbulent at higher casting speeds.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Die Erfindung betrifft eine elektromagnetische Rühreinrichtung für eine Brammenstranggießkokille, wobei eine durch einen Tauchausguß in die Kokille eingeleitete Stahlschmelze durch elektromagnetische Spulen wahlweise mit unterschiedlichen elektromagnetischen Feldern beaufschlagt wird.The invention relates to an electromagnetic stirring device for a continuous slab casting mold, wherein a steel melt introduced into the mold by an immersion spout is selectively subjected to different electromagnetic fields by electromagnetic coils.
Bei einer derartigen durch die JP-A 63-188461 bekannten Rühreinrichtung werden die elektromagnetischen Spulen wahlweise mit Wechselstrom oder Gleichstrom beaufschlagt um ein elektromagnetisches Rühren oder Bremsen der Stahlschmelze zu bewirken und so die Qualität der gegossenen Bramme zu verbessern.In such a stirring device known from JP-A 63-188461, the electromagnetic coils are optionally supplied with alternating current or direct current in order to bring about an electromagnetic stirring or braking of the molten steel and thus to improve the quality of the cast slab.
Durch die US-PS 3 153 820 ist eine elektromagnetische Rühreinrichtung bekannt, wobei zur Erzeugung von Rührkräften unterschiedlicher Intensität Elektromagnete kontinuierlich, aufeinanderfolgend, mit veränderlichen Frequenzen und/oder Phasenbeziehungen betrieben werden können. Auch diese Maßnahmen dienen der Qualitätsverbesserung.An electromagnetic stirring device is known from US Pat. No. 3,153,820, electromagnets being able to be operated continuously, successively, with variable frequencies and / or phase relationships in order to generate stirring forces of different intensities. These measures also serve to improve quality.
Aufgabe der Erfindung ist die Schaffung einer Rühreinrichtung der obigen Gattung mit gegenüber den bekannten Einrichtungen vielfäligerem Rührprogramm zur besseren Anpassung an unterschiedliche Stahlqualitäten und Betriebssituationen einer Stranggießanlage. Insbesondere soll beim Angießen und langsamen Gießen die Schmelzenverteilung verbessert und beim schnellen Gießen die innere Qualität gesteigert und der Badspiegel beruhigt werden.The object of the invention is to provide a stirring device of the above type with a more diverse stirring program compared to the known devices for better adaptation to different steel qualities and operating situations of a continuous casting plant. In particular, the melt distribution should be improved during pouring and slow pouring, the inner quality should be increased and the bath level should be calmed down during fast pouring.
Die gestellte Aufgabe wird nach der Erfindung dadurch gelöst, daß die entlang der Breitseitenwände der Brammenkokille angeordneten elektromagnetischen Spulen in den Feldwirkungen umlaufend, beidseits der Kokillenmitte auf die Schmalseitenwände gerichtet, zur Kokillenmitte entgegengesetzt oder statisch mit Strom beaufschlagbar sind.The object is achieved according to the invention in that the electromagnetic coils arranged along the broad side walls of the slab mold are circumferential in the field effects, are directed at the narrow side walls on both sides of the mold center, are opposite to the mold center or can be subjected to static electricity.
Die Strombeaufschlagung der Rührspulen erfolgt vorteilhaft elektronisch gesteuert von einem Stranggießprozeßrechner.The current applied to the stirring coils is advantageously electronically controlled by a continuous casting process computer.
Mit Bezug auf die Zeichnung wird die Erfindung mit Merkmalen und Vorteilen erläutert.With reference to the drawing, the invention is explained with features and advantages.
Eine in Fig. 1 schematisch dargestellte Brammenstranggießkokille 1 besteht aus zwei Breitseitenwänden 2 und zwei Schmalseitenwänden 3. Die Brammenstranggießkokille 1 wird durch ein Tauchgießrohr 4 mit Stahlschmelze beschickt. Die aus seitlichen Ausströmöffnungen austretenden Gießstrahlen sind durch Pfeile 5 verdeutlicht. Zur Beaufschlagung der Stahlschmelze sind entlang der Breitseitenwände 2 elektromagnetische Rührspulen 6a, 6b, 7a, 7b angeordnet, die mittels einer elektronischen Steuerung zur Anpassung an das jeweilige Gießprogramm und die jeweilige Betriebssituation in unterschiedlicher Weise mit elektrischem Strom beaufschlagt werden.A continuous slab casting mold 1 shown schematically in FIG. 1 consists of two
In Fig. 2 sind unterschiedliche Betriebsweisen I - IV im Prinzip dargestellt.In Fig. 2 different modes of operation I - IV are shown in principle.
In der Betriebsweise I werden die einer Breitseitenwand 2 zugeordneten Rührspulen 6a, 6b im Sinne eines durchgehenden Wanderfeldes 8 strombeaufschlagt. Die der anderen Breitseitenwand zugeordneten Rührspulen 7a, 7b werden zur Erzielung einer Umlaufströmung im Sinne eines entgegengesetzten Wanderfeldes 9 beaufschlagt.In operating mode I, the
Diese Art des Rührens dient einer Verbesserung des Reinheitsgrades und der Oberflächengüte bei der vorgesehenen Sollgießgeschwindigkeit.This type of stirring serves to improve the degree of purity and the surface quality at the intended casting speed.
In der Betriebsweise II werden die beidseits der Kokillenmitte angeordneten Rührspulen 6a, 6b und 7a, 7b unterschiedlich im Sinne entgegengesetzt zu den Schmalseitenwänden verlaufenden Magnetfeldern 10 beaufschlagt. Durch diese eine Beschleunigung der Gießstrahlen 5 bewirkenden Magnetfelder wird beim Gießbeginn und bei langsamer Gießgeschwindigkeit eine optimale Verteilung der Stahlschmelze in einer Kokille für breite Brammen erreicht.In mode of operation II, the
In der Betriebsweise III werden die beidseits der Kokillenmitte angeordneten Rührspulen 6a, 6b und 7a, 7b unterschiedlich zur Erzeugung von gegen die Kokillenmitte (Gießrohrposition) gerichteten Magnetfeldwirkungen beaufschlagt. Durch derartige, bremsend gegen die Gießstrahlen 5 wirkende Wanderfelder 11 wird bei einer höheren Gießgeschwindigkeit eine Beruhigung des Badspiegels und damit eine Verbesserung der Oberflächenqualität der Bramme erreicht. Darüber hinaus wird eine Fehlerverringerung durch beschleunigte Abscheidung von Einschlüssen nach oben erreicht.In operating mode III, the
In der Betriebsweise IV werden die Spulen 6, 7 mit Gleichstrom beaufschlagt, wobei die dann statischen Magnetfelder 12 eine Bremswirkung auf die bei höheren Gießgeschwindigkeit stark turbulente Schmelze erzielen.In operating mode IV, the coils 6, 7 are acted upon by direct current, the static
Claims (2)
dadurch gekennzeichnet,
daß die entlang der Breitseitenwände (2) der Brammenkokille (1) angeordneten elektromagnetischen Spulen (6a, 6b, 7a, 7b) in den Feldwirkungen
umlaufend (I)
beidseits der Kokillenmitte auf die Schmalseitenwände (3)
gerichtet (II)
zur Kokillenmitte entgegengesetzt (III) oder
statisch (IV)
mit Strom beaufschlagbar sind.Electromagnetic stirring device for a continuous slab casting mold, wherein a steel melt introduced into the mold by an immersion spout is optionally exposed to different electromagnetic fields by electromagnetic coils,
characterized by
that the electromagnetic coils (6a, 6b, 7a, 7b) arranged along the broad side walls (2) of the slab mold (1) in the field effects
all around (I)
on both sides of the mold center onto the narrow side walls (3)
directed (II)
opposite to the center of the mold (III) or
static (IV)
can be supplied with electricity.
gekennzeichnet,
durch eine von einem Stranggießprozeßrechner gesteuerte elektronische Strombeaufschlagung der Rührspulen (6a, 6b, 7a, 7b).Electromagnetic stirring device according to claim 1,
featured ,
by means of an electronic current application of the stirring coils (6a, 6b, 7a, 7b) controlled by a continuous casting process computer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19542211 | 1995-11-13 | ||
| DE1995142211 DE19542211B4 (en) | 1995-11-13 | 1995-11-13 | Electromagnetic stirring device for a slab casting mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0774313A1 true EP0774313A1 (en) | 1997-05-21 |
Family
ID=7777305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96117372A Withdrawn EP0774313A1 (en) | 1995-11-13 | 1996-10-30 | Electromagnetic stirring device for a slab caster mould |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0774313A1 (en) |
| JP (1) | JPH09164458A (en) |
| CN (1) | CN1066653C (en) |
| DE (1) | DE19542211B4 (en) |
| RU (1) | RU2170157C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2845626A1 (en) * | 2002-10-14 | 2004-04-16 | Rotelec Sa | Control of the configuration of liquid metal movement in a continuous casting mould by the use of sliding magnetic field to induce a permanent double loop movement configuration |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19738821A1 (en) * | 1997-09-05 | 1999-03-11 | Aeg Elotherm Gmbh | Device for electromagnetic stirring of a molten metal |
| SE519840C2 (en) * | 2000-06-27 | 2003-04-15 | Abb Ab | Method and apparatus for continuous casting of metals |
| FR2861324B1 (en) * | 2003-10-27 | 2007-01-19 | Rotelec Sa | ELECTROMAGNETIC BREWING PROCESS FOR CONTINUOUS CASTING OF EXTENDED SECTION METAL PRODUCTS |
| JP4967856B2 (en) * | 2007-06-28 | 2012-07-04 | 住友金属工業株式会社 | Steel continuous casting method |
| JP5029324B2 (en) * | 2007-11-28 | 2012-09-19 | 住友金属工業株式会社 | Steel continuous casting method |
| JP4968020B2 (en) * | 2007-11-28 | 2012-07-04 | 住友金属工業株式会社 | Operating method at the beginning of casting during continuous casting of steel |
| CN101386060B (en) * | 2008-10-09 | 2011-09-28 | 苏州有色金属研究院有限公司 | Novel copper and copper alloy plate belt electromagnetism assistant casting method and device |
| DE102012213746A1 (en) | 2012-08-02 | 2014-02-06 | Sms Siemag Ag | Device for the shaped application of at least partially solidified metal, in particular continuous casting mold, and method for operating such a device |
| DE102014105870A1 (en) * | 2014-04-25 | 2015-10-29 | Thyssenkrupp Ag | Process and apparatus for thin slab continuous casting |
| CN106475537A (en) * | 2015-08-25 | 2017-03-08 | 宝山钢铁股份有限公司 | The adjustable electromagnetic mixing apparatus of stirring region and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3153820A (en) | 1961-10-09 | 1964-10-27 | Charles B Criner | Apparatus for improving metal structure |
| JPS62203648A (en) * | 1986-02-28 | 1987-09-08 | Nippon Steel Corp | Electromagnetic coil apparatus for continuous casting mold |
| JPS63104763A (en) * | 1986-10-20 | 1988-05-10 | Nkk Corp | Electromagnetic stirring apparatus for continuous casting |
| JPS63188461A (en) | 1987-01-30 | 1988-08-04 | Nippon Steel Corp | Electromagnetic coil apparatus for continuous casting mold |
| EP0151648B1 (en) * | 1983-08-11 | 1988-11-02 | Kawasaki Steel Corporation | Method of electromagnetically stirring molten steel in continuous casting mold and continuous casting apparatus |
| WO1995024285A1 (en) * | 1994-03-07 | 1995-09-14 | Nippon Steel Corporation | Continuous casting method and apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU516491B2 (en) * | 1978-11-06 | 1981-06-04 | Nippon Steel Corporation | Continuous casting |
-
1995
- 1995-11-13 DE DE1995142211 patent/DE19542211B4/en not_active Expired - Lifetime
-
1996
- 1996-10-30 EP EP96117372A patent/EP0774313A1/en not_active Withdrawn
- 1996-11-11 JP JP29861796A patent/JPH09164458A/en active Pending
- 1996-11-12 RU RU96121804A patent/RU2170157C2/en active
- 1996-11-13 CN CN96121903A patent/CN1066653C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3153820A (en) | 1961-10-09 | 1964-10-27 | Charles B Criner | Apparatus for improving metal structure |
| EP0151648B1 (en) * | 1983-08-11 | 1988-11-02 | Kawasaki Steel Corporation | Method of electromagnetically stirring molten steel in continuous casting mold and continuous casting apparatus |
| JPS62203648A (en) * | 1986-02-28 | 1987-09-08 | Nippon Steel Corp | Electromagnetic coil apparatus for continuous casting mold |
| JPS63104763A (en) * | 1986-10-20 | 1988-05-10 | Nkk Corp | Electromagnetic stirring apparatus for continuous casting |
| JPS63188461A (en) | 1987-01-30 | 1988-08-04 | Nippon Steel Corp | Electromagnetic coil apparatus for continuous casting mold |
| WO1995024285A1 (en) * | 1994-03-07 | 1995-09-14 | Nippon Steel Corporation | Continuous casting method and apparatus |
Non-Patent Citations (3)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 055 (M - 669) 19 February 1988 (1988-02-19) * |
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 343 (M - 741) 14 September 1988 (1988-09-14) * |
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 464 (M - 771) 6 December 1988 (1988-12-06) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2845626A1 (en) * | 2002-10-14 | 2004-04-16 | Rotelec Sa | Control of the configuration of liquid metal movement in a continuous casting mould by the use of sliding magnetic field to induce a permanent double loop movement configuration |
| WO2004035248A1 (en) * | 2002-10-14 | 2004-04-29 | Rotelec | Method and device for controlling flows in a continuous slab casting ingot mould |
| US7201211B2 (en) | 2002-10-14 | 2007-04-10 | Rotelec | Method and device for controlling flows in a continuous ingot mold |
| AU2003286222B2 (en) * | 2002-10-14 | 2009-01-22 | Rotelec | Method and device for controlling flows in a continuous slab casting ingot mould |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19542211B4 (en) | 2005-09-01 |
| RU2170157C2 (en) | 2001-07-10 |
| JPH09164458A (en) | 1997-06-24 |
| CN1158770A (en) | 1997-09-10 |
| CN1066653C (en) | 2001-06-06 |
| DE19542211A1 (en) | 1997-05-15 |
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Legal Events
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| 17P | Request for examination filed |
Effective date: 19961113 |
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| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE DE ES FR GB NL |
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| 17Q | First examination report despatched |
Effective date: 19980707 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 19990119 |