EP0542021B1 - Verfahren zum elektromagnetischen Führen beim stranggiessen - Google Patents

Verfahren zum elektromagnetischen Führen beim stranggiessen Download PDF

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Publication number
EP0542021B1
EP0542021B1 EP92118298A EP92118298A EP0542021B1 EP 0542021 B1 EP0542021 B1 EP 0542021B1 EP 92118298 A EP92118298 A EP 92118298A EP 92118298 A EP92118298 A EP 92118298A EP 0542021 B1 EP0542021 B1 EP 0542021B1
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EP
European Patent Office
Prior art keywords
metal
movement
flux
coils
inductors
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
EP92118298A
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English (en)
French (fr)
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EP0542021A1 (de
Inventor
Paul Metz
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.)
Centrem SA
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Centrem SA
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Publication date
Application filed by Centrem SA filed Critical Centrem SA
Publication of EP0542021A1 publication Critical patent/EP0542021A1/de
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Publication of EP0542021B1 publication Critical patent/EP0542021B1/de
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the present invention relates to a brewing process of molten metal for continuous casting, whereby induced in a metal flow, defining a central axis of casting, a mobile electromagnetic induction field at by means of one or more inductors arranged around the metal flow and supplied with polyphase current, said field generating in the molten metal at least one movement transverse to the flow of metal.
  • the object of the present invention is to improve the quality of the internal and external structure of metals cast continuously by proposing a new process for particularly efficient brewing.
  • the present invention proposes a brewing process, as described in the preamble, according to which the inductor (s) are supplied so as to create in the molten metal at least one zone of primary rotary motion which is offset from the central casting axis, and along which a cyclic switching of polyphase current phases from so as to impose on said zone of primary rotary movement a secondary gyratory movement around the central axis of casting.
  • the polyphase current used is advantageously a three-phase current, respectively two-phase current, supplying for example an inductor system with six coils, respectively to eight coils of design known in oneself.
  • an ingot mold with a square section supplies, with a two-phase current, eight coils arranged symmetrically two by two along the four sides of the ingot mold.
  • the method is advantageously applicable to brewing electromagnetic in a cooled section ingot mold circular, square, rectangular or other, with or without submerged central nozzle.
  • it can also be applied to brewing in the various areas located in below the mold for continuous casting.
  • the proposed process can be applied to the continuous casting of all known metals, such as steel, aluminum, copper, etc.
  • the man of art finally appreciate that the proposed process does not require the more often no modification of inductors already installed. It suffices, in fact, to modify or replace power supply, respectively to supplement it by a suitable switching installation.
  • the reference 10 in the Figures represents schematically a horizontal section through, that is a ingot mold, either a billet or a bloom below a ingot mold.
  • the reference 10 therefore designates, in a way general, a metal flow perpendicular to the plane of the figures, whose section can for example be square, rectangular or circular. Note that the metal in merger is solidifying from its periphery.
  • Reference 12 designates an electromagnetic inductor known per se.
  • This inductor can for example be constituted by an annular cage, in one or more pieces, surrounding the metal flow 10. It comprises in Figure 1 for example six coils, numbered from 1 to 6, which can be selectively excited in three-phase current for induce an electromagnetic field in the molten metal.
  • the coils shown schematically in the Figures by black rectangles, can be part of the same field annular or be divided into several groups of coils belonging to several different inductors.
  • the inductor can be salient poles or smooth poles.
  • Figure 1 illustrates schematically, for a section circular, the brewing movements obtained using a single primary movement zone, identified by the reference 14.
  • This movement zone 14 is, in the case shown in Figure 1, generated by a sliding field produced by exciting coils 1-6-5 with the three phases of a three-phase current. Note that this area of movement is offset from the central axis of casting. According to the proposed method, the area is then imposed movement 14 of Figure 1, as a whole, a gyratory movement around the central axis of the flow, which is symbolized by the arrow marked with the reference 18.
  • FIG 2 shows, for the device of Figure 1, the creation of a second primary rotary movement, identified by the reference. 16.
  • This movement 16 is diametrically juxtaposed with the first rotary movement primary 14 but has a direction of rotation opposite to that latest.
  • the second rotation zone 16 is, in the case shown in Figure 2, generated in an exciting the coils 2-3-4 in three-phase current, then that the first rotation zone 14 is, still in the case shown in Figure 2, generated by exciting the coils 1-6-5 in three-phase current.
  • the graph in Figure 3 schematically represents the distribution of three-phase currents between the coils 1 to 6 during a first cycle. Note that during this first cycle, which generates movements 14 and 16 shown in Figure 2, coils 1 and 2 are connected to phase 1, coils 3 and 6 to phase 2 and coils 4 and 5 in phase 3. On the abscissa of the graph of Figure 3 we have carried the time. Blocks black and white are representative of the current in phases over time.
  • This diagram visualizes very well how to feed the coils to create, in the case of Figure 2, the two sliding fields which are move from 2 to 3 to 4, respectively from 1 to 6 towards 5, by entraining the liquid metal and generating thus the offset axes 14 and 16.
  • the speed of rotation of this gyratory movement around of the casting axis is in particular a function of this angle and the length of individual cycles. The latter is continuously variable, within the limits imposed by electrical installation.
  • the speed of secondary rotation will for example be chosen according to the location of the inductor (s) in the installation of casting. Normally the secondary rotation speed and between 5 and 200 revolutions per minute.
  • the frequency of the polyphase supply current will be also chosen according to the location of the inductors. Indeed, the inductor (s) located at the level of the mold will mainly work in the low frequency range (2 to 15 Hz), likely to pass through the walls of the copper ingot mold, while the inductors located below the mold can work at higher frequencies, understood by example between 15 and 70 Hz.
  • Coils are normally supplied with current three-phase, but it is not excluded to supply them with two-phase current.
  • the use of polyphase currents having more of 3 phases is also possible.
  • Figure 4 shows, by way of example not limiting, a three-phase supply, 6 coils of a brewer as shown in Figures 1 and 2.
  • a three-phase supply network shown diagrammatically by reference 22, feeds a converter circuit current 24, known per se. The latter allows you to create its output a system of frequency three-phase currents and adjustable amplitude.
  • An electronic switch 26 switches the 3 phases of the current system three-phase thus formed, according to a predefined sequence, between the 6 coils of the inductor.
  • Figures 5 and 6 schematically illustrate, by way of example, a particular embodiment of the proposed electromagnetic stirring method, applied to an ingot mold 40 with square section.
  • This mold is for example water-cooled and includes a submerged nozzle 42.
  • the power is supplied by two-phase current, so as to obtain sliding magnetic fields generating zones of primary movement 44 1 , 44 2 which are offset in the square section of the mold 40.
  • FIG. 5 represents the movements in a cross section in the direction of casting, during a first excitation cycle of the eight coils. It will be noted that the primary movement zones 44 1 and 44 2 are symmetrical with respect to a median plane.
  • the first phase supplies the coils 1 and 3, respectively 8 and 6.
  • the second phase supplies the coils 2 and 4, respectively 7 and 5.
  • FIG. 6 represents, in a similar view, the movements during the following cycle. It will be noted that the primary movement zones 44 ′ 1 and 44 ′ 2 are symmetrical with respect to a diagonal plane.
  • the first phase supplies the coils 2 and 4, respectively 1 and 7.
  • the second phase supplies the coils 3 and 5, respectively 8 and 6.
  • the arrows identified by the reference 46 in FIGS. 5 and 6 indicate the direction of the gyratory movement of the primary movement zones 44 1 and 44 2 around the submerged nozzle 42. Those skilled in the art will appreciate that this is obtained excellent stirring, without generating around the nozzle 42 a movement similar to a vortex, which risks causing the slag cover, and without subjecting the submerged nozzle 42 to rapid erosion.
  • the invention has been described by way of illustration in referring to vertical casting. However, it can be applied with the same advantages, to an oblique casting, even horizontal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Braking Arrangements (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (8)

  1. Verfahren zum Rühren vom schmelzflüssigem Metall beim Stranggießen, gemäß dem in einem Metallfluß, der eine zentrale Gießachse definiert, mittels eines Systems von Induktoren, die um den Metallfluß herum angeordnet sind und mit Mehrphasenstrom versorgt werden, ein mobiles elektromagnetisches Induktionsfeld induziert wird, wobei das Feld in dem schmelzflüssigen Metall mindestens eine zu dem Metallfluß transversale Bewegung erzeugt, dadurch gekennzeichnet, daß die Spulen des Induktorsystems so versorgt werden, daß in dem schmelzflüssigen Metall (10) mindestens eine primäre Rotationsbewegungszone (14) erzeugt wird, die bezüglich der zentralen Gießachse achsversetzt ist, und daß eine zyklische Umschaltung der Phasen des Mehrphasenstroms so verwirklicht wird, daß dieser primären Rotationsbewegungszone (14) eine sekundäre Kreisbewegung (18) um die zentrale Gießachse herum aufgezwungen wird.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß zwei Rotationsbewegungszonen (14, 16) erzeugt werden, die nebeneinander gelegen sind und entgegengesetzte Rotationsrichtungen haben, wobei sich jede dieser Zonen von dem Umfang des Metallflusses bis zu der zentralen Gießachse erstreckt.
  3. Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Mehrphasenstrom ein Dreiphasenstrom ist.
  4. Verfahren gemäß Anspruch 3, dadurch gekennzeichnet, daß das Induktorsystem sechs Spulen aufweist, die symmetrisch um den Metallfluß herum angeordnet sind.
  5. Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Mehrphasenstrom ein Zweiphasenstrom ist.
  6. Verfahren gemäß Anspruch 5, dadurch gekennzeichnet, daß das Induktorsystem acht Spulen aufweist, die symmetrisch um den Metallfluß herum angeordnet sind.
  7. Verfahren gemäß Anspruch 6, angewandt bei einem Metallfluß mit im wesentlichen quadratischem Querschnitt, dadurch gekennzeichnet, daß die acht Spulen paarweise symmetrisch längs der vier Seiten des Metallflusses angeordnet sind.
  8. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß der primären Rotationsbewegung (14, 16) und der sekundären Kreisbewegung (18) eine spiralförmige Bewegung gemäß der Gießachse überlagert wird.
EP92118298A 1991-11-13 1992-10-26 Verfahren zum elektromagnetischen Führen beim stranggiessen Expired - Lifetime EP0542021B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU88034A LU88034A1 (fr) 1991-11-13 1991-11-13 Procédé de brassage électromagnétique en coulée continue
LU9188034 1991-11-13

Publications (2)

Publication Number Publication Date
EP0542021A1 EP0542021A1 (de) 1993-05-19
EP0542021B1 true EP0542021B1 (de) 1998-01-21

Family

ID=19731326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118298A Expired - Lifetime EP0542021B1 (de) 1991-11-13 1992-10-26 Verfahren zum elektromagnetischen Führen beim stranggiessen

Country Status (10)

Country Link
US (1) US5279351A (de)
EP (1) EP0542021B1 (de)
JP (1) JP3131513B2 (de)
AT (1) ATE162439T1 (de)
BR (1) BR9204480A (de)
CA (1) CA2082579A1 (de)
DE (1) DE69224148T2 (de)
ES (1) ES2114904T3 (de)
LU (1) LU88034A1 (de)
MX (1) MX9206529A (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE513627C2 (sv) * 1994-12-15 2000-10-09 Abb Ab Sätt och anordning vid gjutning i kokill
JP3372958B2 (ja) * 1997-12-08 2003-02-04 新日本製鐵株式会社 溶融金属の鋳造方法およびその装置並びに鋳片
FR2805483B1 (fr) * 2000-02-29 2002-05-24 Rotelec Sa Equipement pour alimenter en metal en fusion une lingotiere de coulee continue, et son procede d'utilisation
US6929055B2 (en) * 2000-02-29 2005-08-16 Rotelec Equipment for supplying molten metal to a continuous casting ingot mould
US7350559B2 (en) * 2002-12-16 2008-04-01 Energetics Technologies, Llc Systems and methods of electromagnetic influence on electroconducting continuum
DE102004017443B3 (de) * 2004-04-02 2005-04-21 Technische Universität Dresden Verfahren und Vorrichtung zum Rühren von elektrisch leitenden Flüssigkeiten in Behältern
US20080164004A1 (en) * 2007-01-08 2008-07-10 Anastasia Kolesnichenko Method and system of electromagnetic stirring for continuous casting of medium and high carbon steels
JP5669509B2 (ja) * 2010-07-16 2015-02-12 高橋 謙三 攪拌装置付き連続鋳造用鋳型装置
ITUB20159776A1 (it) * 2015-12-30 2017-06-30 Ergolines Lab S R L Impianto di produzione di barre metalliche, macchina di colata, processo di colata e metodo di controllo di dispositivi elettromagnetici di agitazione di metallo fuso
EP3405301B1 (de) * 2016-01-19 2021-05-05 Rotelec SA Verfahren für rotierendes elektromagnetisches rühren einer metallschmelze beim giessen eines produkts mit grossem querschnitt und vorrichtung zur durchführung des verfahrens
US10926321B2 (en) * 2016-11-08 2021-02-23 2700585 Ontario Inc. System and method for continuous casting of molten material
EP3849726B1 (de) 2018-09-10 2023-05-03 Ergolines Lab S.r.l. Elektromagnetische rührvorrichtung in einer form zum giessen von aluminium oder aluminiumlegierungen, rührverfahren in einer form zum giessen von aluminium oder aluminiumlegierungen, form und giessmaschine zum giessen von aluminium oder aluminiumlegierungen
CN119794290B (zh) * 2025-03-13 2025-07-22 东北大学 一种水平磁路式连铸电磁搅拌器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485411B1 (fr) * 1980-06-27 1985-11-08 Siderurgie Fse Inst Rech Lingotiere de coulee continue electromagnetique de produits metalliques a section rectangulaire allongee
DE3527387A1 (de) * 1985-07-31 1987-02-26 Klaus Prof Dr In Schwerdtfeger Verfahren zum elektromagnetischen ruehren metallischer schmelzen
JPS6257750A (ja) * 1985-09-07 1987-03-13 Kobe Steel Ltd スラブ連鋳機用鋳型内電磁撹拌方法
JPS63286257A (ja) * 1987-05-19 1988-11-22 Sumitomo Metal Ind Ltd 電磁撹拌方法
US4877079A (en) * 1987-10-09 1989-10-31 Westinghouse Electric Corp. Counterflow electromagnetic stirring method and apparatus for continuous casting
US5085265A (en) * 1990-03-23 1992-02-04 Nkk Corporation Method for continuous casting of molten steel and apparatus therefor

Also Published As

Publication number Publication date
DE69224148D1 (de) 1998-02-26
JP3131513B2 (ja) 2001-02-05
ES2114904T3 (es) 1998-06-16
CA2082579A1 (fr) 1993-05-14
LU88034A1 (fr) 1993-05-17
DE69224148T2 (de) 1998-08-20
US5279351A (en) 1994-01-18
JPH0639508A (ja) 1994-02-15
EP0542021A1 (de) 1993-05-19
MX9206529A (es) 1994-06-30
BR9204480A (pt) 1993-05-18
ATE162439T1 (de) 1998-02-15

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