EP0058048B1 - Dispositif de brassage électromagnétique - Google Patents

Dispositif de brassage électromagnétique Download PDF

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Publication number
EP0058048B1
EP0058048B1 EP82300550A EP82300550A EP0058048B1 EP 0058048 B1 EP0058048 B1 EP 0058048B1 EP 82300550 A EP82300550 A EP 82300550A EP 82300550 A EP82300550 A EP 82300550A EP 0058048 B1 EP0058048 B1 EP 0058048B1
Authority
EP
European Patent Office
Prior art keywords
mould
windings
extents
axis
core
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
Application number
EP82300550A
Other languages
German (de)
English (en)
Other versions
EP0058048A1 (fr
Inventor
Joseph Aloysius Mulcahy
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.)
Co Steel International Ltd
Original Assignee
Co Steel International Ltd
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
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Application filed by Co Steel International Ltd filed Critical Co Steel International Ltd
Publication of EP0058048A1 publication Critical patent/EP0058048A1/fr
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Publication of EP0058048B1 publication Critical patent/EP0058048B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/34—Arrangements for circulation of melts
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/02—Stirring of melted material in melting furnaces

Definitions

  • This invention relates to electromagnetic stirring apparatus for the provision of a magnetic field rotating about the path of steel through a continuous casting mould, the purpose of such field being to cause rotation of the steel, which is still liquid, in the mould.
  • 'axis of the mould' herein is meant the line extending in the direction of flow through the mould at the approximate centre of such flow.
  • apparatus for causing electromagnetic stirring in a continuous steel casting mould comprising;
  • apparatus for causing electromagnetic stirring in a continuous steel casting mould comprising;
  • a core can be provided for each coil.
  • Magnetic material is preferably provided substantially joining the ends of the cores of adjacent coils as encountered moving about the mould. With such joining magnetic material there is provided a magnetic circuit extending about the mould.
  • the core shall have the shape of the coil cross section, having in radial cross section relative to the axis of the mould a long dimension axially of the mould (for the approximate extent desired for the effective operation of the rotating field) and a short dimension measured in a radial direction.
  • Figure 1 a rectangular continuous casting mould defined by mould wall 10.
  • a cooling pipe network is provided for cooling the mould along with water inlet and outlet conduits 12 and 14. These are not described in detail since they are well known and conventional in the continuous casting arts.
  • the mould walls to the left and right of the Figure are slightly curved to be concave to the right. Such curvature in one of the four directions is provided in modern moulds to allow the billet direction to be gradually altered from one direction (here vertical) to another (here horizontal). Older moulds have straight wall sides and both types are within the scope of the invention.
  • a coil comprising a core 15 and a multi- turned winding 16 wound thereon.
  • Figure 1 is a horizontal section.
  • Figure 2 indicates the winding segments shown on each side of the core are joined over the top and bottom of the core.
  • Core 15 as shown extends, in plan view, approximately the length of the mould side. It is relatively thin in vertical cross-section. It is shown as constructed of three laminations of suitable magnetic core material rivetted together. However, the lamination arrangement is merely for .ease of fabrication and desired dimensions of core 15 of suitable magnetic material may be achieved in any desired way. As indicated, the core 15 is provided with a long dimension in its axial direction relative to its thickness and to the axial height of the core. The axial height and axial location of the core defines effectively the effective axial height of the rotating electromagnetic field in the mould.
  • a winding is formed by turns having a long axial dimension extent down one side of the core, a short radial transverse extent about the lower edge, a long axial extent up the other side of the core, about the upper edge again, down the mould and so on.
  • the core, wound in this way may be provided with the number of layers and of turns desired.
  • Such a winding is provided with leads 18 and 20 which are connected, (and the winding is wound) so that the current flows in one direction (up or down) on one side of the core and in the opposite direction on the other.
  • the windings are paired on opposite sides of the mould and are connected in series which series connection, together with the winding direction, is used to provide that the mould-adjacent extents (i.e. the parts of the winding turns between the core and the mould) carry (at an instant in the A.C. energization) current down in the winding on mould-adjacent long extents on one side of the mould and current up in the mould adjacent long extents of the paired coil on the other side of the mould.
  • Such currents will produce a field across the mould having its main component transverse to both the mould axis and to the diameter extending between the centre of the paired windings.
  • Figure 3 represents schematically the two sets of paired windings 16 in relation to input leads.
  • one pair of windings 16 is connected in series between the phase 1 power input P and neutral connection N while the other pair of coils 16 is connected in series between the phase 2 power input Q and the neutral connection N.
  • only one connection is required between paired coils. (It will also be noted that there would be no greater number of connections if the paired coils were connected in parallel.)
  • the two sets of paired coils are energized with two phase power, with a phase angle of 90° between the phases, that there is created desired rotating electromagnetic field and having a rotational frequency equal to the exciting frequency of each phase.
  • the series connection of the paired opposite windings 16 only requires a single conductor 22 between the series connected windings which conductor 22 extends half-way about the mould and (if input leads P, Q and N are all on the same side of the assembly) a conductor from the non-series connected end of one of the coils which is remote from the input leads P, Q and N round to the side of the input leads.
  • the opposed paired windings 16 may be connected in parallel across the relevant phase of the two phase supply and with such parallel connection no more and possibly less leads are required about the mould.
  • magnetic core material is provided in the corner members 24 which are triangular in plan view and extend for the approximate height of the core.
  • the members 24 abut the ends of core members 15 on each side of a respective corner to provide with such core members a substantially continual magnetic circuit about the mould.
  • Figures 4 and 5 show an arrangement where the magnetic circuit is, in effect, a unitary core member 28, formed of magnetic material, extending about the core, although it may be formed of separate connected members if desired.
  • a unitary core member 28 formed of magnetic material, extending about the core, although it may be formed of separate connected members if desired.
  • two peripherally designed recesses 30 are provided so that the windings 32 on each side of the mould may be wound in two sections for convenience of winding.
  • the two sections on each side of a core are connected in series and the paired windings 32 on opposite sides of the mould are connected in series by a single conductor as in the alternative of Figure 1.
  • the winding sense and the connections are such that the turn extents of mould-adjacent sides of opposed coils carry current down on one side of the mould and up on the other at any instant of the A.C. energization.
  • the two divisions shown on one side of a coil are designed for more convenient winding.
  • the connection of the opposed pairs of coils is in series and the relationship is the same as with the embodiment of Figure 1. With pairs of coils connected in series a single half turn is needed to connect ends of paired coils.
  • single conductor When, in relation to the embodiments of Figures 1-3 or Figures 4 and 5 the term "single conductor" is used referring to the connections to or between windings, this is not intended to be limiting.
  • the invention requires only a single connection to or between windings about the mould. This connection may for current carrying capacity or ease of winding be embodied in two or more conductors which together establish the connection.
  • Figure 6 shows the same elements as shown in Figures 1 and 2 adapted for three phase operation.
  • the windings of the alternative of Figure 6 have, collectively, the same extent as those shown in Figures 1 and 2.
  • the windings of Figure 6 comprise three pairs, for example each winding 31 forming part of the phase 1 pair extents along 2/3 of a side as does each winding 33 corresponding to the phase 3 pair.
  • the phase 2 windings 32 each have adjacent extents 32A and 32B connected about a corner. The windings in a pair are located in opposing positions across the mould and the phases of the windings are cyclically distributed about the mould.
  • the windings for a phase are wound so that, in the extents between the core and the mould, current runs down on one side of the mould and up on the other.
  • the portions of the winding pairs inside the core produce 3 fields whose combined effect, with the three phase energization, is to produce a magnetic field across the mould rotating in accord with the three phase energization.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)

Claims (6)

1. Appareil pour provoquer le brassage électromagnétique dans un moule de coulée continue (10) de l'acier constitué par des bobines alimentées en courant polyphasé induisant dans le moule un champ tournant qui provoque une rotation de l'acier qui se trouve à dans l'état liquide à l'intérieur du moule, caractérisé par le fait fu'il comprend un circuit magnétique (15, 24) en matériau magnétique s'étandant d'une manière pratiquement continue autour dudit moule et à une certaine distance de celui-ci, au moins deux paires d'enroulements (16), chaque enroulement comprenant des parties disposées pour véhiculer le courant dans une direction à l'intérieur du matériau magnétique et d'autre parties disposées pour véhiculer le courant dans la direction opposée à l'extérieur du matériau magnétique, que les enroulements d'une même paire sont disposés diamétralement opposés l'un à l'autre, transversalement par rapport à l'axe de l'écoulement à l'intérieur dudit moule, pouvant être alimentés par la même phase du courant alternatif, de manière à obtenir dans les parties desdits enroulements opposés d'une même paire, qui se trouvent à l'intérieur du circuit magnétique des courants simultanés de sens opposé, que le nombre de paires d'enroulement est en relation directe avec le nombre de phases d'un système d'alimentation électrique polyphasé et que les enroulements respectifs correspondant auxdites phases sont disposés cycliquement autour du moule.
2. Appareil pour provoquer le brassage électromagnétique dans un moule (10) de coulée continue de l'acier, caractérisé par le fait qu'il comprend au moins une paire d'enroulements (16) correspondant à chacune des phases d'un système polyphasé d'alimentation en courant alternatif, que les deux enroulements d'une même paire sont disposés en regard l'un de l'autre de part et d'autre dudit moule, que les enroulements respectifs corresponauxdites différentes phases sont disposés cycliquement autour du moule, que chacun desdits enroulements est composé de spires dont la grande dimension s'étend parallèlement à l'axe d'écoulement à l'intérieur dudit moule et dont la petite dimension s'étend perpendiculairement audit axe d'écoulement et que lesdits enroulements sont bobines autour de noyaux (15) en matériau magnétique.
3. Appareil selon la revendication 2, caractérisé par le fait que chacun desdits noyaux (15), vu en coupe selon un plan radial par rapport à l'axe dudit moule, présente une forme comportant une dimension longue parallèle audit axe et une dimension courte s'étendant perpendiculairement à celui-ci.
4. Appareil selon la revendication 2 ou 3, caractérisé par le fait que des éléments (24) en matériau identique à celui des noyaux sont prévus, s'étendant essentiellement entre les extrémités des noyaux (15) adjacents et que ce fait on obtient un circuit magnétique constitué par lesdits noyaux et lesdits éléments, qui s'étend d'une manière pratiquement continue autour dudit moule.
5. Appareil selon la revendication 1, caractérisé par le fait que lesdites spires sont disposées de manière à avoir une dimension dimension longue parallèle à l'axe dudit moule et une dimension courte qui lui est perpendiculaire.
6. Appareil selon la revendication 1 ou la revendication 5, caractérisé par le fait que vu en coupe par un plan radial par rapport audit moule, ledit matériau magnétique présente une dimension longue parallèle à l'axe dudit moule et une dimension courte orientée radialement par rapport audit axe.
EP82300550A 1981-02-05 1982-02-03 Dispositif de brassage électromagnétique Expired EP0058048B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23158981A 1981-02-05 1981-02-05
US231589 1981-02-05

Publications (2)

Publication Number Publication Date
EP0058048A1 EP0058048A1 (fr) 1982-08-18
EP0058048B1 true EP0058048B1 (fr) 1985-02-13

Family

ID=22869876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82300550A Expired EP0058048B1 (fr) 1981-02-05 1982-02-03 Dispositif de brassage électromagnétique

Country Status (4)

Country Link
EP (1) EP0058048B1 (fr)
JP (1) JPS57146457A (fr)
CA (1) CA1169226A (fr)
DE (1) DE3262243D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61212456A (ja) * 1985-03-15 1986-09-20 Mitsubishi Heavy Ind Ltd 連続鋳造設備における電磁撹拌装置
JPH0682495U (ja) * 1993-05-11 1994-11-25 三桜工業株式会社 屈曲合成樹脂チューブユニット

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036302A1 (fr) * 1980-03-13 1981-09-23 Co-Steel International Limited Agitateur électromagnétique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1064849A (fr) * 1952-10-16 1954-05-18 Perfectionnements aux moules de coulée continue des métaux et en particulier de l'acier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036302A1 (fr) * 1980-03-13 1981-09-23 Co-Steel International Limited Agitateur électromagnétique

Also Published As

Publication number Publication date
EP0058048A1 (fr) 1982-08-18
CA1169226A (fr) 1984-06-19
DE3262243D1 (en) 1985-03-28
JPS57146457A (en) 1982-09-09

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