EP0542021A1 - Verfahren zum elektromagnetischen Führen beim stranggiessen - Google Patents

Verfahren zum elektromagnetischen Führen beim stranggiessen Download PDF

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Publication number
EP0542021A1
EP0542021A1 EP92118298A EP92118298A EP0542021A1 EP 0542021 A1 EP0542021 A1 EP 0542021A1 EP 92118298 A EP92118298 A EP 92118298A EP 92118298 A EP92118298 A EP 92118298A EP 0542021 A1 EP0542021 A1 EP 0542021A1
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EP
European Patent Office
Prior art keywords
metal
movement
coils
casting
flow
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
EP92118298A
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English (en)
French (fr)
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EP0542021B1 (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
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Publication of EP0542021A1 publication Critical patent/EP0542021A1/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 method of stirring molten metal for continuous casting, according to which a mobile electromagnetic induction field is induced in a metal flow, defining a central casting axis 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 metal flow.
  • the aim of the present invention is to improve the quality of the internal and external structure of continuously cast metals by proposing a new particularly efficient brewing process.
  • the present invention provides a stirring 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 movement which is offset from the center to the central casting axis, and according to which a cyclic switching of the phases of the polyphase current of so as to impose on said primary rotary movement zone a secondary gyratory movement around the central casting axis.
  • two primary movement zones with opposite directions of rotation are juxtaposed, each of these zones preferably extending from the edge of the metal flow to the central casting axis. At their interface the two primary movements are then superimposed to intensify the flow through the central regions. The secondary gyratory movement guarantees that this central flow has no predominant direction.
  • the polyphase current used is advantageously a three-phase current, respectively a two-phase current, supplying for example an inductor system with six coils, respectively with eight coils of design known per se.
  • eight coils are arranged symmetrically two by two along a four-phase current along the four sides of the ingot mold.
  • the method is advantageously applicable to electromagnetic stirring in a cooled ingot mold, with circular, square, rectangular or other section, with or without a submerged central nozzle.
  • it can also be applied to stirring in the various zones located below the mold for continuous casting.
  • the proposed method can be applied to the continuous casting of all known metals, such as steel, aluminum, copper, etc.
  • the proposed process most often does not require modification of the inductors already installed. It suffices, in fact, to modify or replace the electrical supply, respectively to supplement it with an adequate switching installation.
  • Reference 10 in the Figures schematically represents a horizontal section through either an ingot mold, a billet or a bloom below an ingot mold.
  • the reference 10 therefore designates, in general, a metal flow perpendicular to the plane of the figures, the section of which can for example be square, rectangular or circular. Note that the molten metal is being solidified from its periphery.
  • the reference 12 designates an electromagnetic inductor known per se.
  • This inductor can for example be constituted by an annular cage, in one or more parts, surrounding the metal flow 10. It comprises in Figure 1 for example six coils, numbered from 1 to 6, which can be selectively excited by three-phase current to induce an electromagnetic field in the molten metal.
  • the coils shown diagrammatically in black rectangles, can be part of the same annular inductor or be divided into several groups of coils belonging to several different inductors.
  • the inductor can be with salient poles or with smooth poles.
  • Figure 1 schematically illustrates, for a circular section, the stirring 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. It will be noted that this movement zone is off-center with respect to the central casting axis. According to the proposed method, the movement zone 14 of FIG. 1 is then imposed, as a whole, a gyratory movement around the central axis of the casting, which is symbolized by the arrow indicated by 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 primary rotary movement 14, but has a direction of rotation opposite to the latter.
  • the second rotation zone 16 is, in the case shown in FIG. 2, generated by exciting the coils 2-3-4 in three-phase current, while the first rotation zone 14 is, still in the case shown in Figure 2, generated by exciting coils 1-6-5 in three-phase current.
  • a primary gyratory movement is then imposed on the primary rotation zones 14 and 16 around the pouring axis, which is symbolized in FIG. 2 by the arrow indicated by the reference 18.
  • 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 the movements 14 and 16 shown in Figure 2, the coils 1 and 2 are connected to phase 1, the coils 3 and 6 to phase 2 and the coils 4 and 5 to phase 3. On the abscissa of the graph in Figure 3 we have plotted time. The black and white blocks are representative of the current in the phases over time. This diagram shows very well how it is necessary to feed the coils to create, in the case of Figure 2, the two sliding fields which move from 2 towards 3 towards 4, respectively from 1 towards 6 towards 5, by entraining the liquid metal and thereby generating the offset axes 14 and 16.
  • the coils 3 and 2 will be connected to phase 1, the coils 4 and 1 to phase 2 and the coils 5 and 6 to phase 3.
  • the zones of rotary movement 14 and 15 will thus be moved by a predetermined angle around the casting axis. This angle depends in particular on the number and configuration of the poles of the stirrer. In the above-mentioned case it is for example an angle of 60 °, so that a complete rotation around the central casting axis requires six cycles similar to that shown in FIG. 3.
  • the speed of rotation of this gyratory movement around the casting axis is notably a function of this angle and of the duration of the individual cycles.
  • the latter is continuously variable, within the limits imposed by the electrical installation.
  • the secondary rotation speed will for example be chosen as a function of the location of the inductor (s) in the installation of casting. Normally, the secondary rotation speed is between 5 and 200 revolutions per minute.
  • the frequency of the polyphase supply current will also be chosen according to the location of the inductor (s). Indeed, the inductor or inductors located at the level of the ingot mold will work mainly in the low frequency domain (2 to 15 Hz), likely to pass through the walls of the copper ingot mold, while the inductors located below the ingot mold may work at higher frequencies, for example between 15 and 70 Hz.
  • the coils are normally supplied with three-phase current, but it is not excluded to supply them with two-phase current.
  • the use of polyphase currents with more than 3 phases is also possible.
  • FIG. 4 represents, by way of nonlimiting example, a three-phase supply, of the 6 coils of a brewer as shown in FIGS. 1 and 2.
  • a three-phase supply network represented schematically by the reference 22 , supplies a circuit of converters current 24, known per se. The latter makes it possible to create at its output a system of three-phase currents of adjustable frequency and amplitude.
  • An electronic switch 26 makes it possible to switch the 3 phases of the three-phase current system 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 process, applied to an ingot mold 40 with square section.
  • This mold is for example water-cooled and comprises a submerged nozzle 42.
  • the supply is made with two-phase current, so as to obtain sliding magnetic fields generating zones of primary movement 441, 442 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 441 and 442 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Braking Arrangements (AREA)
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 true EP0542021A1 (de) 1993-05-19
EP0542021B1 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 (12)

* 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
CA2279909C (en) * 1997-12-08 2005-07-26 Nippon Steel Corporation Method for casting molten metal, apparatus for the same and cast slab
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
AU2003301029A1 (en) * 2002-12-16 2004-07-22 Herman D. Branover 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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485411A1 (fr) * 1980-06-27 1981-12-31 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
US4867786A (en) * 1987-05-19 1989-09-19 Sumitomo Metal Industries, Ltd. Electromagnetic stirring method
US4877079A (en) * 1987-10-09 1989-10-31 Westinghouse Electric Corp. Counterflow electromagnetic stirring method and apparatus for continuous casting
EP0448113A2 (de) * 1990-03-23 1991-09-25 Nkk Corporation Verfahren und Vorrichtung zum Stranggiessen von Stahlschmelzen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485411A1 (fr) * 1980-06-27 1981-12-31 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
US4867786A (en) * 1987-05-19 1989-09-19 Sumitomo Metal Industries, Ltd. Electromagnetic stirring method
US4877079A (en) * 1987-10-09 1989-10-31 Westinghouse Electric Corp. Counterflow electromagnetic stirring method and apparatus for continuous casting
EP0448113A2 (de) * 1990-03-23 1991-09-25 Nkk Corporation Verfahren und Vorrichtung zum Stranggiessen von Stahlschmelzen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 250 (M-616)(2697) 14 Août 1987 & JP-A-62 057 750 ( KOBE STEEL LTD ) 13 Mars 1987 *

Also Published As

Publication number Publication date
LU88034A1 (fr) 1993-05-17
JP3131513B2 (ja) 2001-02-05
ATE162439T1 (de) 1998-02-15
JPH0639508A (ja) 1994-02-15
CA2082579A1 (fr) 1993-05-14
BR9204480A (pt) 1993-05-18
ES2114904T3 (es) 1998-06-16
DE69224148T2 (de) 1998-08-20
MX9206529A (es) 1994-06-30
EP0542021B1 (de) 1998-01-21
US5279351A (en) 1994-01-18
DE69224148D1 (de) 1998-02-26

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