EP0850116B1 - Dispositif electromagnetique pour coquille de coulee en continu - Google Patents

Dispositif electromagnetique pour coquille de coulee en continu Download PDF

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Publication number
EP0850116B1
EP0850116B1 EP96932449A EP96932449A EP0850116B1 EP 0850116 B1 EP0850116 B1 EP 0850116B1 EP 96932449 A EP96932449 A EP 96932449A EP 96932449 A EP96932449 A EP 96932449A EP 0850116 B1 EP0850116 B1 EP 0850116B1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
stirrers
sub
casting mould
mold
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
Application number
EP96932449A
Other languages
German (de)
English (en)
Other versions
EP0850116A1 (fr
Inventor
Dieter BÜLHOFF
Wolfram Jung
Hans-Joachim Paris
Otto-Alexander Schmidt
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0850116A1 publication Critical patent/EP0850116A1/fr
Application granted granted Critical
Publication of EP0850116B1 publication Critical patent/EP0850116B1/fr
Anticipated expiration legal-status Critical
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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
    • 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

Definitions

  • the invention relates to a stationary continuous casting mold, in particular for casting steel, with an electromagnetic device comprising a plurality of partial stirrers, which in pairs arranged at a distance from each other on the outer wall of the continuous casting mold and to a electrical alternating voltage with appropriate phase position to generate a rotating electromagnetic force field are connected.
  • Stationary continuous casting molds are suitable for carrying out the method for casting steel in the immersion tube casting process, in which the immersion tube extending into the continuous casting mold is immersed in the melt. It is known to influence the solidification during the continuous casting of high-melting metals, such as steel, by generating rotating electromagnetic fields in the stationary continuous casting mold by stirring.
  • a stirring device for stationary continuous casting molds with two part stirring devices which can be operated independently of one another and which are arranged one behind the other in the casting direction on the outer wall of the continuous casting mold is known, for example, from DE-OS 38 19 492.
  • the electromagnetic rotating fields are generated in the mold.
  • this stirring device is intended to achieve a uniform, finer microstructure of the cast strand, a uniform distribution of non-metallic inclusions, better heat dissipation, etc.
  • a stirrer arrangement is known, in which two opposing stirrers are rotated through an angle.
  • the stirring device (Herrmann, E., Manual of Continuous Casting, Aluminum-Verlag GmbH, Düsseldorf 1958, pages 417-429") can be formed, for example, from a plurality of electromagnets made of horseshoe-shaped transformer sheets, which are arranged vertically or horizontally on the wall of the Continuous casting mold are arranged. The induction flow goes from one leg of the horseshoe to the other through the molten metal.
  • the molten metal passed through the mold is subjected to a continuous mechanical circulation flow due to the magnetic fluxes generated.
  • the stirring device is operated such that the electromagnets, the magnetic field of which, for example, propagates in the direction of the vertical axis of the mold, are controlled in such a way that the direction of the maximum magnetic flux rotates about the vertical axis of the mold. This is intended to achieve a good circulation of the metal melt with good efficiency at the same time.
  • the invention solves the problem by the in the characterizing part of Claim 1 specified features. Due to the characteristic features of subclaims 2 to 7 is the inventive device of the stationary Continuous casting mold can be designed in an advantageous manner.
  • the invention provides that the electromagnetic device at least two Includes pairs of partial stirrers and the partial stirrers of each pair are arranged opposite one another, namely at an angle x-shaped rotated against each other, the rotation in a plane parallel to Pouring direction takes place. All pairs are essentially the same height arranged.
  • the electromagnetic Facilities each lead to an upward spiral Rotational movement of the molten metal in the middle of the mold, what causes superheated steel to move up from the bottom of the mold, which in turn solidifies the melt between the ceramic inlet pipe and Mold wall (so-called bridging) prevented.
  • electromagnetic device there is a horizontal and vertical Rotation of the melt.
  • the electromagnetic device continues to improve the Degree of purity of the cast strand, since the reduction is more vertical Currents in the melt floating impurities into the Slag zone favors.
  • the partial stirrers of the pairs facing each other on the broad sides are arranged. Both pairs generate independently in the between them, a mold area lying in a helical upward direction Rotational movement with opposite direction of rotation, whereby the currents of the Steel melt in the stationary continuous casting mold in the area of the dip tube influence each other so that also around the dip tube a helical upward rotational movement of the melt occurs.
  • the electromagnetic according to the invention has a particularly good effect Set up when the amount of the angle by which the partial stirrer is opposite the Casting direction are arranged rotated, is in the range between and 30 ° and 60 °.
  • the partial stirrers are in the form of coils with one ferromagnetic U-shaped core. This makes a strong one Generate a magnetic field in the stationary continuous casting mold with little effort.
  • Partial stirrers are expediently mounted in rotatable holders for this purpose can be adjusted by an actuator.
  • the control is usually done either controlled by hand or using a specified setting algorithm.
  • the manipulated variable can be, for example, the frequency of the swells on the surface of the Serve melt, but it can also be the depth of the formed on the dip tube Inlet funnel of the molten metal can be used.
  • the continuous casting mold 10 is open at the top and bottom; the lower one Cross-sectional area through which the metal strand leaves the mold is normal less than or equal to the upper cross-sectional area of the continuous casting mold 10.
  • the Mold walls 11, 12 enclose the mold cavity 13 into which a dip tube 14 protrudes, which has one or more outflow openings at the free end. In the mold cavity 13 is molten metal that continuously over the dip tube 14 can be fed and through the lower mold outlet opening is continuously discharged.
  • the molten metal solidifies on contact with the cooled mold walls 11, 12 in the continuous casting mold 10, so that a shell is formed.
  • the thickness of this shell gradually increases as the metal Continuous casting mold 10 happens until it as a strand from the lower part of the Continuous casting mold 10 emerges.
  • the shell must exit 10 from the continuous casting mold have a sufficient thickness because the strand was not at that time is completely solidified to hold back the molten core that eventually solidifies and forms a solid strand.
  • the pouring level in the mold cavity 13 is above the Outflow opening of the dip tube 14 and is covered with mold powder.
  • the mold powder serves as a lubricant and reduces the friction between the outer surface of the Melt and the mold walls 11, 12.
  • the continuous casting mold 10 is provided with an electromagnetic device 20, from the partial stirrers 21-24 arranged on the mold walls 11, 12 is formed.
  • the partial stirrers 21-24 are in pairs 21, 24 and 22, 23 interconnected.
  • the angle through which the partial stirrers of a pair are arranged rotated relative to each other is preferably in the range between and 30 ° and 60 °.
  • the partial stirrers are a pair rotated by 45 ° against each other, i.e. the rotation of the partial stirrer Pair is (2 times 45 ° equal) 90 °.
  • the exact angle is determined in a known manner according to the phase position of the AC voltage, which is used to excite the partial stirrer 21 - 24 cares.
  • the partial stirrers 21-24 are turned on AC voltages connected in the order of the partial stirrer 21 - 24 differ by a phase difference of 45 °, so for the Angle by which the partial stirrer of a pair rotates against each other to be arranged, a value of 45 °.
  • Each partial stirrer 21-24 has a ferromagnetic U-shaped design Core.
  • the core is an iron core that consists of Dynamo sheet is made and carries coils made of copper wires.
  • the cross section of the Cores are rectangular; the pole shoes lie on the mold walls 11, 12 on.
  • the magnetic fields generated by the partial agitators 21-24 penetrate through the Mold walls 11, 12 into the mold cavity 13 and penetrate the molten metal.
  • Each pair of partial stirrers 21, 24 and 22, 23 is operated independently of one another and connected in phases so that in the mold cavity 13 between the Partial stirrers 21, 24 and 22, 23 each have a resulting rotating magnetic field is generated that a rotating mechanical force field in the melt, as in FIG. 3 shown, which originates in the left mold half near the front broad side 12 and in the right half near the rear broad side 12.
  • the rotating force field is upwards, but towards the opposite one Mold wall directed, i.e. there are force components in both vertical and in the horizontal direction. So it will be in the left and right mold halves opposing force fields induced, one in the left half of the mold in the middle to the left outer wall and in the right half of the mold one from the middle generate rotating flow in the melt to the right wall.
  • the vertical components of the force fields upwards directed; however, the horizontal vector components run in opposite directions for two mold halves.
  • the distance between the partial agitator pairs 21, 24 and 22, 23 is so chosen so that the melt performs a stirring movement in the area of the immersion tube, without the melt entering the mold through the dip tube already in Immersion tube is braked. Outside the dip tube is the electromagnetic one Braking effect of the device 20 is quite desirable.
  • the partial agitator pairs 21, 24 and 22, 23 consequently produces a constant upward flow of hot melt; the melt becomes an upward spiral rotation imposed.
  • the mold cavity 13 faces in the opposite direction, so that it is inside the mold cavity 13 at least partially to suppress the natural movement of the melt comes and the associated swellings on the surface with the disadvantages the drawing of casting powder and slag particles into the strand shell area be prevented.
  • the electromagnetic device 20 enables a reversal of the vertical Flow directions in the stationary continuous casting mold with the advantages mentioned with simultaneous horizontal stirring of the melt.
  • FIG. 2 shows a top view of the stationary continuous casting mold shown in FIG. 1.
  • the connection scheme of the partial agitators 21-24 is the electromagnetic one Device 20 shown.
  • the pairs are 21, 24 and 22, 23 the electromagnetic device 20 each electrically connected in series. So are the upper terminals of the coils 25, 27 and 26, 28 connected to each other.
  • the series connection can the partial stirrers of a pair 21, 24 and 22, 23 on one normal AC voltage source.
  • An actuator is used to adapt to different casting conditions (not shown) by which the partial stirrers of each pair 21, 24 and 22, 23 can be rotated against each other during operation, so much the same to optimally set the electromagnetic device 20.
  • the partial agitators 21, 24 and 22, 23 are conveniently mounted in rotatable brackets that the actuator can be adjusted.
  • the control is usually carried out by a microprocessor, either controlled by hand or based on a predetermined one Setting algorithm.
  • the frequency of the Surges on the surface of the melt serve, but it can also be the depth of the suction funnel of the molten metal that forms on the immersion tube become.
  • the electromagnetic device 20 may also be of a variety of Partial agitator pairs 21, 24 and 22, 23 can be constructed, each in a subspace the stationary continuous casting mold the corresponding described above generate magnetic rotating fields with a corresponding sense of rotation, what by correct control of the partial agitator pairs and a corresponding one Angular rotation of the partial stirrers of a pair 21, 24 and 22, 23 against each other can be adjusted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Confectionery (AREA)

Claims (7)

  1. Coquille de coulée continue fixe, notamment pour la coulée d'acier, avec un dispositif électromagnétique qui comprend plusieurs agitateurs partiels qui sont agencés par paires sur la paroi extérieure de la coquille de coulée continue à une certaine distance les uns des autres et qui sont raccordés à une tension électrique alternative avec une relation de phase appropriée pour produire un champ de force électromagnétique tournant,
       caractérisée en ce que
    les agitateurs partiels (21 à 24) comprennent au moins deux paires (21, 24 et 22, 23) et les agitateurs partiels de chaque paire (21, 24 et 22, 23) sont à l'opposé l'un de l'autre et sont tournés l'un par rapport à l'autre d'un certain angle pour former un x dans un plan parallèle à la direction de coulée et toutes les paires (21, 24 et 22, 23) sont agencées globalement à la même hauteur.
  2. Coquille de coulée continue selon la revendication 1,
       caractérisée en ce que,
    dans le cas d'une coquille de coulée continue fixe à section rectangulaire, les agitateurs partiels des paires (21, 24 et 22, 23) sont agencés à l'opposé les uns des autres sur les côtés larges (12).
  3. Coquille de coulée continue selon la revendication 1 ou 2,
       caractérisée en ce que
    les agitateurs partiels de chaque paire (21, 24 et 22, 23) sont branchés électriquement en série.
  4. Coquille de coulée continue selon la revendication 3,
       caractérisée en ce que
    les agitateurs partiels (21, 24 et 22, 23) branchés électriquement en série sont raccordés à chaque fois à des tensions alternatives déphasées de 90°.
  5. Coquille de coulée continue selon l'une des revendications 1 à 4,
       caractérisée en ce que
    la valeur de l'angle dont les agitateurs partiels (21, 24 et 22, 23) sont tournés à chaque fois l'un par rapport à l'autre vaut de 30° à 60°.
  6. Coquille de coulée continue selon l'une des revendications 1 à 7,
       caractérisée en ce que
    les agitateurs partiels (21, 24 et 22, 23) sont conçus comme des bobines (25 à 28) à noyaux ferromagnétiques en forme de U.
  7. Coquille de coulée continue selon l'une des revendications 1 à 6,
       caractérisée en ce que
    il est prévu un mécanisme de réglage par lequel les agitateurs partiels de chaque paire (21, 24 et 22, 23) peuvent être tournés l'un par rapport à l'autre d'une manière pouvant être prescrite au cours du fonctionnement.
EP96932449A 1995-08-29 1996-08-13 Dispositif electromagnetique pour coquille de coulee en continu Expired - Lifetime EP0850116B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19533577 1995-08-29
DE19533577A DE19533577C1 (de) 1995-08-29 1995-08-29 Elektromagnetische Einrichtung für eine Stranggießkokille
PCT/DE1996/001554 WO1997007911A1 (fr) 1995-08-29 1996-08-13 Dispositif electromagnetique pour coquille de coulee en continu

Publications (2)

Publication Number Publication Date
EP0850116A1 EP0850116A1 (fr) 1998-07-01
EP0850116B1 true EP0850116B1 (fr) 1999-03-24

Family

ID=7771842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96932449A Expired - Lifetime EP0850116B1 (fr) 1995-08-29 1996-08-13 Dispositif electromagnetique pour coquille de coulee en continu

Country Status (9)

Country Link
US (1) US6021842A (fr)
EP (1) EP0850116B1 (fr)
JP (1) JP2942361B2 (fr)
KR (1) KR100264946B1 (fr)
CN (1) CN1072058C (fr)
AT (1) ATE177975T1 (fr)
AU (1) AU7124796A (fr)
DE (2) DE19533577C1 (fr)
WO (1) WO1997007911A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738821A1 (de) * 1997-09-05 1999-03-11 Aeg Elotherm Gmbh Vorrichtung zum elektromagnetischen Rühren einer Metallschmelze
US6845809B1 (en) 1999-02-17 2005-01-25 Aemp Corporation Apparatus for and method of producing on-demand semi-solid material for castings
US6796362B2 (en) * 2000-06-01 2004-09-28 Brunswick Corporation Apparatus for producing a metallic slurry material for use in semi-solid forming of shaped parts
US6399017B1 (en) 2000-06-01 2002-06-04 Aemp Corporation Method and apparatus for containing and ejecting a thixotropic metal slurry
US6432160B1 (en) * 2000-06-01 2002-08-13 Aemp Corporation Method and apparatus for making a thixotropic metal slurry
US6402367B1 (en) * 2000-06-01 2002-06-11 Aemp Corporation Method and apparatus for magnetically stirring a thixotropic metal slurry
DE102009029889A1 (de) * 2008-07-15 2010-02-18 Sms Siemag Ag Elektromagnetische Bremseinrichtung an Stranggießkokillen
DE102009056000A1 (de) 2009-08-28 2011-03-03 Sms Siemag Ag Verfahren zum Gießen von flüssigen Metallen
US20110048669A1 (en) * 2009-08-31 2011-03-03 Abb Inc. Electromagnetic stirrer arrangement with continuous casting of steel billets and bloom
DE102012213746A1 (de) 2012-08-02 2014-02-06 Sms Siemag Ag Vorrichtung zur geformten Ausbringung zumindest teilweise erstarrten Metalls, insbesondere Stranggießkokille, und Verfahren zum Betreiben einer solchen Vorrichtung
GB201305822D0 (en) * 2013-03-28 2013-05-15 Pavlov Evgeny Improvements in and relating to apparatus and methods
WO2015179677A1 (fr) * 2014-05-21 2015-11-26 Novelis Inc. Régulation d'écoulement de métal en fusion sans contact

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56158259A (en) * 1980-05-13 1981-12-05 Kawasaki Steel Corp Method for accelerating floating of nonmetallic inclusion in tundish
JPS5970445A (ja) * 1982-10-15 1984-04-20 Nippon Steel Corp 連続鋳造設備用電磁撹拌装置
JPS6040654A (ja) * 1983-08-12 1985-03-04 Mitsubishi Heavy Ind Ltd モ−ルド内電磁撹拌装置
JPS60234757A (ja) * 1984-05-04 1985-11-21 Mitsubishi Heavy Ind Ltd モ−ルド内の電磁撹拌装置
DE3819492A1 (de) * 1988-06-08 1989-12-14 Voest Alpine Ind Anlagen Knueppel- bzw. vorblock-stranggiesskokille
JPH0673722B2 (ja) * 1988-09-09 1994-09-21 新日本製鐵株式会社 連続鋳造方法

Also Published As

Publication number Publication date
KR19990028576A (ko) 1999-04-15
WO1997007911A1 (fr) 1997-03-06
DE19533577C1 (de) 1996-10-24
CN1072058C (zh) 2001-10-03
CN1194601A (zh) 1998-09-30
KR100264946B1 (ko) 2000-09-01
JP2942361B2 (ja) 1999-08-30
US6021842A (en) 2000-02-08
JPH11500362A (ja) 1999-01-12
EP0850116A1 (fr) 1998-07-01
ATE177975T1 (de) 1999-04-15
DE59601517D1 (de) 1999-04-29
AU7124796A (en) 1997-03-19

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