EP0197482A2 - Vorrichtung zum Rühren des flüssigen Metalls in einer Stranggiessanlage - Google Patents

Vorrichtung zum Rühren des flüssigen Metalls in einer Stranggiessanlage Download PDF

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Publication number
EP0197482A2
EP0197482A2 EP86104374A EP86104374A EP0197482A2 EP 0197482 A2 EP0197482 A2 EP 0197482A2 EP 86104374 A EP86104374 A EP 86104374A EP 86104374 A EP86104374 A EP 86104374A EP 0197482 A2 EP0197482 A2 EP 0197482A2
Authority
EP
European Patent Office
Prior art keywords
branches
magnetic core
inductor
casting line
nozzle
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.)
Withdrawn
Application number
EP86104374A
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English (en)
French (fr)
Other versions
EP0197482A3 (de
Inventor
Paul Metz
Paul Kirsch
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.)
Individual
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Individual
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 Individual filed Critical Individual
Publication of EP0197482A2 publication Critical patent/EP0197482A2/de
Publication of EP0197482A3 publication Critical patent/EP0197482A3/de
Withdrawn legal-status Critical Current

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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/62—Pouring-nozzles with stirring or vibrating means
    • 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 device for mixing molten metal in a continuous casting installation in which the molten metal flows in a controlled manner from a reservoir through a nozzle to an ingot mold, this device consisting of at least an electromagnetic inductor comprising a magnetic core and windings and designed to induce a rotational movement in the molten metal.
  • a device of this kind is known from document EP-A-0 093 068.
  • the electromagnetic stirring proposed by this patent has already proven itself and the essential advantages are that it is not only possible to free the nozzles in fouling gas. , but we can also prevent slag and inclusions from the metal bath from being sucked in by the vortices that form during continuous casting, especially when applying electromagnetic stirring in the mold or immediately below the ingot mold.
  • an inductor control system is used which is connected, on the one hand, to the system for controlling the flow rate of the supply of the liquid metal ingot mold, and, on the other hand, the metal level control system in the mold.
  • Document GB-A-2024679 describes another stirring device comprising one or more electromagnetic inductors which are mounted on movable sleepers and which allow the inductors to be withdrawn when it proves advantageous to carry out the casting without stirring.
  • this device does not have the efficiency and the yield of the powerful single-core inductor of document EP-A-0 093 068 which surrounds the molten metal and which is capable of inducing a rotating field in the metal.
  • the document GB-A-2006068 proposes a multipolar inductor comprising several poles extending perpendicularly from a core and which allows a casting line to be approached on one side despite the presence of advancement rollers which, in the operative position, are between the inductor mates.
  • this inductor can only exert a unilateral effect because it does not allow 360 ° access to the casting line.
  • the object of the present invention is to provide a new mixing device which combines the advantages of the known devices described above.
  • the present invention is essentially characterized in that the electromagnetic inductor is displaceable transversely relative to the metal casting line and in that its magnetic core consists of a single piece with several branches arranged around the casting line away from it and directed radially on the casting line.
  • the core comprises three branches each provided with an electromagnetic winding and which form between them angles of 120 °.
  • the inductor is. preferably arranged around the nozzle, but similar inductors can be arranged around the casting line in the secondary cooling zone.
  • the minimum distance between the branches of the inductor is greater than the outside diameter of the nozzle in order to allow engagement and withdrawal of the inductor.
  • one of the branches of the core can be connected to the rest of the latter by means of a hinge which allows the folding of this branch.
  • the three branches of the core can be arranged in a staircase around the nozzle, which causes a helical rotation in the molten metal.
  • each of these has on its inner face a short-circuit winding.
  • the core comprises only one electromagnetic winding and two branches, the ends of which are designed by means of an axial notch in the form of a fork with two teeth, and in which a tooth of a branch and the diametrically opposite tooth of the other branch has a short circuit winding.
  • the improvement to which the device proposed by the invention is subject compared with the state of the art lies in the fact that the inductor is no longer in contact with the nozzle or the casting line and that it can be removed if necessary.
  • the resulting advantage is that the electrical part of the inductor can be placed outside the hot zone, which simplifies its construction and eliminates or facilitates its cooling.
  • the inductor proposed by the invention does not hinder access to the nozzle and the ingot mold, which facilitates the control of the casting operation and the introduction into the ingot mold of metallurgical additives and additives. .
  • the core consists of a single piece whose branches are oriented radially on the casting line allows the creation of a very powerful rotary field.
  • the electromagnetic inductor proposed by the present invention comprises a magnetic core 14 with three branches 14a, 14b, 14c, having the general configuration of the letter E, the ends of the two outer branches 14b and 14c being bent in the direction of the middle branch of so that the axes of the three branches 14a, 14b, 14c have a common point or axis of intersection 0 opposite the middle branch 14a.
  • the three branches have, moreover, a symmetrical arrangement around the axis 0, that is to say form between them angles of 1200.
  • each of the branches 14a, 14b, 14c of the core are arranged respective electromagnetic windings 16, 18 and 20.
  • the inductor In the operative position, the inductor is arranged around the nozzle 10 in such a way that the axis O coincides with the central axis of the latter. However, in accordance with one of the features of the present invention, the inductor can be moved transversely relative to the nozzle 10, this mobility being symbolized by the arrow A.
  • the core 14 can, for this purpose, be mounted on a carriage mobile not shown.
  • the core 14 may be provided with a hinge 22 to separate one of the branches. exterior 14b or 14c. This hinge can be provided at the location indicated in Figure 1 to allow the folding of the branch 14b in the direction of arrow B, or in the region of the curvature of the branch 14b.
  • the proposed inductor operates like an electric motor, the three windings 16, 18 and 20 being connected to a three-phase alternating current, while the liquid metal column of the nozzle 10 acts as a rotor.
  • the frequency of the alternating current supplying the windings 16, 18 and 20 is normally that of the network. However, it is preferable to provide means allowing a reduction in the frequency, in particular when the product to be treated has a low magnetic permeability which is often the case when the stirring device is used in the secondary cooling zone.
  • a frequency greater than the frequency of the network may be used.
  • brewing is possible using a two-phase system, i.e. a magnetic core with two opposite branches.
  • branches 14a, 14b and 14c are arranged at the same level, that is to say that their axes are coplanar.
  • the branches 14a, 14b and 14c may in particular have a staircase-shaped arrangement around the nozzle 10, which allows the creation in the metal bath of a helical rotation movement.
  • an asymmetrical stirring with respect to the axis of the cast product, in particular in the secondary cooling zone.
  • This asymmetrical mixing can be obtained by placing the three branches at different distances from the axis of the casting line. It is also possible to provide different angles between the three branches of the core.
  • Figure 2 illustrates an example of such an embodiment.
  • the adjacent interior faces of the three branches 14a, 14b and 14c comprise turns or short-circuit windings 24.
  • Leakage currents being established perpendicularly between the branch 14a, on the one hand, and the branches 14b and 14c, on the other hand, generate in these windings 24 a current whose field opposes the leakage currents.
  • windings 24 by other suitable means such as for example low resistivity metal plates.
  • FIG. 3 shows an embodiment of an inductor designed for smaller installations or installations in which the space available for the inductor is reduced.
  • the inductor according to FIG. 3, which operates on single-phase current. Carries a magnetic core 26 with two branches 26a and 26b having the general configuration of the letter C, that is to say that the central branch of the mode is missing. of embodiment of FIG. 1.
  • This core 26 has only one electromagnetic winding and to allow it to generate, in monophase, a rotary field in the nozzle not shown, but located between the ends of the branches 26a and 26b, these are designed by means of an axial cut in the form of two teeth 26a ,, 26a 2 and 26b ,, 26b ,.
  • the diametrically opposite teeth in the example shown the teeth 26a 2 and 26b , are provided with short-circuit windings 30, 32.
  • the effect of these is that at the frequency of half a phase , the field lines are established alternately between the opposite teeth 26a 2 and 26b., on the one hand, and the opposite teeth 26a 1 and 26b, on the other hand, to generate a rotary field between the four teeth , that is to say in the casting line.
  • the distance between the teeth 26a and 26b 2 is also greater than the diameter of the nozzle or, if this design poses problems, one of the branches 26a, 26b or one of the outer teeth 26a2, 26b 2 can be provided with a hinge.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP86104374A 1985-04-10 1986-03-29 Vorrichtung zum Rühren des flüssigen Metalls in einer Stranggiessanlage Withdrawn EP0197482A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU85846A LU85846A1 (fr) 1985-04-10 1985-04-10 Dispositif de brassage de metal en fusion dans une installation de coulee continue
LU85846 1985-04-10

Publications (2)

Publication Number Publication Date
EP0197482A2 true EP0197482A2 (de) 1986-10-15
EP0197482A3 EP0197482A3 (de) 1988-05-11

Family

ID=19730436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104374A Withdrawn EP0197482A3 (de) 1985-04-10 1986-03-29 Vorrichtung zum Rühren des flüssigen Metalls in einer Stranggiessanlage

Country Status (5)

Country Link
US (1) US4749026A (de)
EP (1) EP0197482A3 (de)
JP (1) JPS61276755A (de)
BE (1) BE904562A (de)
LU (1) LU85846A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613647A1 (fr) * 1987-04-13 1988-10-14 Alsthom Dispositif de brassage electromagnetique de metal liquide pour ligne de coulee continue

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464503B (sv) * 1987-11-12 1991-05-06 Asea Ab Flyttbar straengomroerare
DE3829810A1 (de) * 1988-09-02 1990-03-15 Leybold Ag Verfahren und vorrichtung zum senkrechten abgiessen von metallschmelzen
DE19843354C1 (de) * 1998-09-22 2000-03-09 Ald Vacuum Techn Gmbh Vorrichtung zum gerichteten Erstarren einer in eine Formschale gegossenen Metallschmelze sowie ein Verfahren hierzu
IL140246A (en) * 2000-12-12 2007-09-20 Pavel Dvoskin Treatment of molten metals by moving an electric arc during aggregation
SE523472C2 (sv) * 2001-01-10 2004-04-20 Abb Ab Elektromagnetisk broms samt dess användning
IL144422A0 (en) * 2001-07-18 2002-05-23 Netanya Plasmatec Ltd Riser(s) size reduction and/or metal quality improving in gravity casting of shaped products by moving electric arc
IL145099A0 (en) * 2001-08-23 2002-06-30 Netanya Plasmatec Ltd Method and apparatus for stirring and treating continuous and semi continuous metal casting
FR2840821B1 (fr) * 2002-06-13 2005-03-04 Commissariat Energie Atomique Dispositif electromagnetique de fusion et d'agitation interfaciale de systemes diphasiques, notamment pour l'acceleration de processus metallurgiques ou pyrochimiques
US7350559B2 (en) * 2002-12-16 2008-04-01 Energetics Technologies, Llc Systems and methods of electromagnetic influence on electroconducting continuum
US20090021336A1 (en) * 2002-12-16 2009-01-22 Energetics Technologies, Llc Inductor for the excitation of polyharmonic rotating magnetic fields
DE602008006049D1 (de) * 2008-05-30 2011-05-19 Abb Ab Stranggießmaschine
WO2015188573A1 (zh) * 2014-06-10 2015-12-17 东北大学 一种电磁旋流水口连铸方法及装置
CN105268935B (zh) * 2014-06-10 2017-10-20 东北大学 一种两瓣式浸入式水口电磁旋流装置及其支撑装置
CN105195697A (zh) * 2014-06-10 2015-12-30 东北大学 一种单侧开口的电磁旋流装置及其支撑装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1086957A (fr) * 1952-08-27 1955-02-17 Procédé de coulée
GB2006068A (en) * 1977-09-23 1979-05-02 Aeg Elotherm Gmbh Device for generating an electro- magnetic rotary field
GB2024679A (en) * 1978-06-23 1980-01-16 Mannesmann Ag Apparatus for receiving and moving electromagnetic stirrer mechanisms in continuous casting apparatus
WO1980001999A1 (en) * 1979-03-21 1980-10-02 British Steel Corp Continuous casting of steel
EP0023897A1 (de) * 1979-08-01 1981-02-11 VOEST-ALPINE Aktiengesellschaft Einrichtung an einer Stranggiessanlage
EP0093068A1 (de) * 1982-04-22 1983-11-02 Paul Metz Verwendung von Kokillen-Ausgüssen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743492A (en) * 1953-04-20 1956-05-01 Allegheny Ludlum Steel Apparatus for controlling the flow of molten metal
US3574485A (en) * 1958-11-28 1971-04-13 Broido Louis Method and apparatus for movement of liquids by electromagnetic means
SE410284B (sv) * 1978-02-10 1979-10-08 Asea Ab Forfaringssett for omrorning av metalliska smelta samt anordning for genomforande av detta forfaringssett
DE2834305A1 (de) * 1978-08-03 1980-02-14 Aeg Elotherm Gmbh Einrichtung zum elektromagnetischen ruehren der fluessigen schmelze in einer stranggiessanlage
DE2944760A1 (de) * 1979-11-06 1981-05-07 Siemens AG, 1000 Berlin und 8000 München Einrichtung zum umruehren von metallischen schmelzen in stranggiessanlagen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1086957A (fr) * 1952-08-27 1955-02-17 Procédé de coulée
GB2006068A (en) * 1977-09-23 1979-05-02 Aeg Elotherm Gmbh Device for generating an electro- magnetic rotary field
GB2024679A (en) * 1978-06-23 1980-01-16 Mannesmann Ag Apparatus for receiving and moving electromagnetic stirrer mechanisms in continuous casting apparatus
WO1980001999A1 (en) * 1979-03-21 1980-10-02 British Steel Corp Continuous casting of steel
EP0023897A1 (de) * 1979-08-01 1981-02-11 VOEST-ALPINE Aktiengesellschaft Einrichtung an einer Stranggiessanlage
EP0093068A1 (de) * 1982-04-22 1983-11-02 Paul Metz Verwendung von Kokillen-Ausgüssen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613647A1 (fr) * 1987-04-13 1988-10-14 Alsthom Dispositif de brassage electromagnetique de metal liquide pour ligne de coulee continue
EP0286960A1 (de) * 1987-04-13 1988-10-19 Gec Alsthom Sa Vorrichtung zum elektromagnetischen Rühren von flüssigem Metall in einer Stranggusslinie
US4834168A (en) * 1987-04-13 1989-05-30 Alsthom Device for electromagnetically stirring liquid metal on a continuous casting line

Also Published As

Publication number Publication date
BE904562A (fr) 1986-07-31
EP0197482A3 (de) 1988-05-11
LU85846A1 (fr) 1986-11-05
JPS61276755A (ja) 1986-12-06
US4749026A (en) 1988-06-07

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