EP0850116A1 - Dispositif electromagnetique pour coquille de coulee en continu - Google Patents

Dispositif electromagnetique pour coquille de coulee en continu

Info

Publication number
EP0850116A1
EP0850116A1 EP96932449A EP96932449A EP0850116A1 EP 0850116 A1 EP0850116 A1 EP 0850116A1 EP 96932449 A EP96932449 A EP 96932449A EP 96932449 A EP96932449 A EP 96932449A EP 0850116 A1 EP0850116 A1 EP 0850116A1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
partial
pairs
mold
casting 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.)
Granted
Application number
EP96932449A
Other languages
German (de)
English (en)
Other versions
EP0850116B1 (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
Expired - Lifetime legal-status Critical Current

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
    • 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 which comprises a plurality of partial stirrers which are arranged on the outer wall of the continuous casting mold at a distance from one another and are connected to an alternating electrical voltage with a corresponding phase position for generating a rotating electromagnetic force field .
  • 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 19492.
  • the electromagnetic rotating fields are generated in the mold.
  • this stirring device is intended to achieve a uniform, finer structural structure of the cast strand, a uniform distribution of non-metallic inclusions, better heat dissipation, etc.
  • the stirring device (Herrmann, E., Manual of Continuous Casting, Aluminum-Verlag GmbH, Dusseldorf 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 molten metal with good efficiency at the same time.
  • Claim 1 specified features. Due to the characterizing features of subclaims 2 to 7, the inventive device of the stationary continuous casting coke can be designed in an advantageous manner.
  • the invention provides that the electromagnetic device comprises at least two pairs of partial stirrers and the partial stirrers of each pair are arranged opposite one another, namely rotated relative to one another by an x-shaped angle, the rotation taking place in a plane parallel to the pouring direction. All pairs are arranged essentially at the same height.
  • the electromagnetic devices each lead to a helical upward rotational movement of the molten metal in the central area of the mold, which causes superheated steel to move upward from the lower area of the mold, which in turn causes the melt to solidify between the ceramic inlet pipe and the mold wall (so-called bridging) prevented.
  • the electromagnetic device according to the invention results in horizontal and vertical rotation of the melt. These rotational movements generated in the melt effectively prevent the formation of white bands (bands with negative segregation).
  • the electromagnetic device also leads to an improvement in the degree of purity of the cast strand, since the reduction is more vertical
  • the electromagnetic device according to the invention has a particularly good effect if the amount of the angle by which the partial stirrers are rotated relative to the pouring direction is in the range between and 30 ° and 60 °.
  • the partial stirrers are designed as coils with a ferromagnetic U-shaped core. As a result, a strong magnetic field can be generated with little effort in the stationary caster.
  • an easy-to-use adaptation to different casting conditions is achieved by means of an actuator provided, by means of which the partial stirrers of each pair can be rotated against one another during operation.
  • the electromagnetic device can thus be optimally adjusted with little effort.
  • the partial stirrers are expediently mounted in rotatable brackets which can be adjusted by an actuator.
  • the control is usually done either manually or using a specified setting algorithm.
  • the frequency of the swellings on the surface of the melt can serve as a manipulated variable, however, the depth of the suction funnel of the metal melt that forms on the immersion tube can also be used.
  • Fig. 1 is a schematic spatial representation of a stationary
  • Fig. 2 is a plan view of the stationary shown in Fig. 1
  • Fig. 3 is a schematic spatial representation of a stationary
  • a stationary continuous casting mold 10 for the continuous casting of metals has a continuous casting mold which is formed by four mold walls 11, 12 made of metal, namely two broad sides 12 and two narrow sides 11.
  • the continuous casting coconut 10 is open at the top and bottom; the lower cross-sectional area through which the metal strand leaves the mold is normally less than or equal to the upper cross-sectional area of the continuous casting mold 10.
  • 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.
  • Molten metal is located in the mold cavity 13 and can be fed continuously via the dip tube 14 and is continuously discharged through the lower mold outlet opening.
  • the molten metal solidifies in 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 passes through the continuous casting coconut 10 until it emerges as a strand from the lower part of the continuous casting cocily 10.
  • the shell must have a sufficient thickness upon exiting the continuous casting coke 10 because at that point the strand is not yet completely solidified in order to retain the molten core which finally solidifies and forms a solid strand.
  • the casting level which is set in the mold cavity 13 lies above the outflow opening of the dip tube 14 and is covered with casting powder.
  • the pouring memever 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, which consists of the partial stirrers 21 - 24 arranged on the mold walls 11, 12 is formed.
  • the partial stirrers 21-24 are connected to form pairs 21, 24 and 22, 23.
  • two pairs 21, 24 and 22, 23 are provided, which are arranged to the right and left to the pouring direction A, the partial stirrers of a pair 21, 24 and 22, 23 each located opposite one another on the broad sides 12 of the continuous casting coke 10.
  • FIG. 1 reveals, the partial agitators 21, 24 and 22, 23 of a pair are rotated in an X-shaped manner parallel to one another in a plane parallel to the pouring direction.
  • the angle by which the partial stirrers of a pair are each rotated relative to one another is preferably in the range between and 30 ° and 60 °. in the exemplary embodiment, the partial stirrers of a pair are each rotated by 45 ° relative to one another, ie the rotation of the partial stirrers of a pair is (2 times 45 ° equal) 90 °.
  • the exact angle depends in a known manner on the phase position of the alternating voltage, which ensures the excitation of the partial stirrers 21-24.
  • the partial stirrers 21-24 are connected to alternating voltages which differ in the order of the partial stirrers 21-24 by a phase difference of 45 °, the angle by which the partial stirrers of a pair are to be arranged rotated relative to one another results , a value of 45 °.
  • Each partial stirrer 21 - 24 has a ferromagnetic U-shaped core.
  • the core is an iron core which is made from dynamo sheet and carries coils made of copper wires.
  • the cross section of the cores is rectangular; the Pohl shoes rest on the Kokiilenwallen 11, 12.
  • the generated magnetic fields of the partial stirrers 21-24 penetrate through the mold walls 11, 12 into the mold cavity 13 and penetrate the metal melt.
  • opposing force fields are induced in the left and right mold halves, which produce a flow in the melt rotating from the center to the left outer wall in the left mold half and a flow rotating from the center to the right wall in the right mold half.
  • the vertical components of the force fields are directed upwards in the central part of the mold; however, the horizontal vector components run in opposite directions for both mold halves.
  • the distance between the pairs of partial stirrers 21, 24 and 22, 23 is selected so that the melt performs a stirring movement in the area of the dip tube without the melt entering the mold through the dip tube being slowed down in the dip tube. Outside the immersion tube, the electromagnetic braking effect of the device 20 is quite desirable.
  • the electromagnetic device 20 makes it possible to reverse the vertical flow directions in the stationary continuous casting coke with the advantages mentioned, while at the same time stirring the melt horizontally. Due to the simultaneous horizontal stirring in the left and right part of the mold, temperature stratification is counteracted and the overheating heat is evenly reduced. Dendrites that form are stirred away and then accumulate as globulites on the solidification front of the melt. Due to the horizontal and vertical stirring of the melt, the formation of negative segregations (so-called white bands) is prevented.
  • Fig. 2 shows a plan view of the stationary continuous casting coke shown in Fig. 1.
  • the connection diagram of the partial agitators 21 -24 of the electromagnetic device 20 is shown.
  • the pairs 21, 24 and 22, 23 of the electromagnetic device 20 are each electrically connected in series.
  • the upper connections of the coils 25, 27 and 26, 28 are connected to one another.
  • the partial stirrers of a pair 21, 24 and 22, 23 can be operated on a normal AC voltage source.
  • an actuator (not shown) is provided, by means of which the partial stirrers of each pair 21, 24 and 22, 23 can be rotated relative to one another during operation in order to optimally adjust the electromagnetic device 20.
  • the partial stirrers 21, 24 and 22, 23 are expediently mounted in rotatable brackets which can be adjusted by the actuator.
  • the control is usually carried out by a microprocessor, either regulated by hand or using a predetermined setting algorithm.
  • the frequency of the swells on the surface of the melt can serve as the manipulated variable, but the depth of the suction funnel of the metal melt that forms on the immersion tube can also be used.
  • the electromagnetic device 20 can also be constructed from a multiplicity of pairs of partial stirrers 21, 24 and 22, 23, each of which corresponds to the corresponding ones described above in a subspace of the stationary continuous casting coke generate magnetic rotating fields with a corresponding sense of rotation, which can be set against one another by controlling the partial stirring pairs as well as a corresponding angular rotation of the partial stirrers of a pair 21, 24 and 22, 23.

Landscapes

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

Abstract

L'invention concerne une coquille fixe pour la coulée en continu, en particulier d'acier, pourvue d'un dispositif électromagnétique comprenant une pluralité d'éléments agitateurs disposés en paires, à une certaine distance les uns des autres, le long de la paroi extérieure de ladite coquille et connectés à une alimentation en courant alternatif. La coquille comporte au moins deux paires d'éléments agitateurs (21-24) et les éléments de chaque paire sont disposés avec une certaine inclinaison l'un par rapport à l'autre, de façon à former un X, dans un plan parallèle au sens de la coulée, toutes les paires d'éléments se trouvant sensiblement à la même hauteur.
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 true EP0850116A1 (fr) 1998-07-01
EP0850116B1 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
US6432160B1 (en) 2000-06-01 2002-08-13 Aemp Corporation Method and apparatus for making a thixotropic metal slurry
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
US6402367B1 (en) * 2000-06-01 2002-06-11 Aemp Corporation Method and apparatus for magnetically stirring a thixotropic metal slurry
US6399017B1 (en) 2000-06-01 2002-06-04 Aemp Corporation Method and apparatus for containing and ejecting a thixotropic metal slurry
DE102009029889A1 (de) * 2008-07-15 2010-02-18 Sms Siemag Ag Elektromagnetische Bremseinrichtung an Stranggießkokillen
DE102009056001A1 (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
JP6625065B2 (ja) 2014-05-21 2019-12-25 ノベリス・インコーポレイテッドＮｏｖｅｌｉｓ Ｉｎｃ． 非接触式の溶融金属流れの制御

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9707911A1 *

Also Published As

Publication number Publication date
JP2942361B2 (ja) 1999-08-30
WO1997007911A1 (fr) 1997-03-06
AU7124796A (en) 1997-03-19
JPH11500362A (ja) 1999-01-12
DE59601517D1 (de) 1999-04-29
EP0850116B1 (fr) 1999-03-24
DE19533577C1 (de) 1996-10-24
ATE177975T1 (de) 1999-04-15
US6021842A (en) 2000-02-08
KR100264946B1 (ko) 2000-09-01
CN1194601A (zh) 1998-09-30
CN1072058C (zh) 2001-10-03
KR19990028576A (ko) 1999-04-15

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