WO1996026029A1 - Procede et dispositif de coulee dans un moule - Google Patents

Procede et dispositif de coulee dans un moule Download PDF

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Publication number
WO1996026029A1
WO1996026029A1 PCT/SE1996/000241 SE9600241W WO9626029A1 WO 1996026029 A1 WO1996026029 A1 WO 1996026029A1 SE 9600241 W SE9600241 W SE 9600241W WO 9626029 A1 WO9626029 A1 WO 9626029A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
cast strand
act
melt
magnets
Prior art date
Application number
PCT/SE1996/000241
Other languages
English (en)
Inventor
Anders Lehman
Jan Erik Eriksson
Original Assignee
Asea Brown Boveri Ab
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 Asea Brown Boveri Ab filed Critical Asea Brown Boveri Ab
Priority to BR9607263A priority Critical patent/BR9607263A/pt
Priority to EP96904426A priority patent/EP0871554A1/fr
Priority to JP8525622A priority patent/JPH11502466A/ja
Publication of WO1996026029A1 publication Critical patent/WO1996026029A1/fr

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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects

Definitions

  • the present invention relates to a method and device, during casting of metal in a mould, of controlling the flow of liquid metal in non-solidified portions of a cast strand which is formed in the mould.
  • the flow is controlled by means of static or periodically low-frequency magnetic fields which are adapted to act at a plurality of levels located one after the other in the direction of casting.
  • the mould is open in both ends of the direction of casting.
  • a primary flow of liquid metal, melt, flowing into the mould is braked and secondary flows of liquid metal arisen in the non-solidified portions of a cast strand formed in the mould are controlled by means of the above-mentioned magnetic field arranged transversely of the casting direction.
  • the invention is especially applicable to continuous casting in a chilled mould where an uncontrolled inflow of hot melt, containing slag particles or other non-metallic particles, and/or an uncontrolled secondary flow in the non-solidified portions of a cast strand, entail problems both from the points of view of quality and production engineering.
  • a melt is supplied to the mould by means of a free tapping jet, open casting, or through a casting tube, closed casting.
  • a cast strand is formed by the melt being cooled.
  • a cast strand has been formed, which at least comprises one solidi ⁇ fied self-supporting surface layer formed around the residual melt.
  • One object of the invention is to suggest a method, by means of a plurality of static or periodically low-frequency magne ⁇ tic fields adapted to act at a plurality of levels arranged one after the other in the casting direction, of braking the primary flow of incoming hot melt and controlling secondary flows of melt arising in the non-solidified portions of a cast strand, such that a reliable and efficient control of these flows is obtained.
  • Another object of the invention is to suggest a device for carrying out the invented method.
  • the flow of the melt in the non-solidified portions of a cast strand is controlled such that
  • the supply of heat to the melt in the upper parts of the mould is controlled and a sufficient flow channel is achieved close to the meniscus, among other things to prevent the meniscus from freezing.
  • the flow in these upper parts of the non-solidified portions of the cast strand is limited so as not to become so strong that waves are formed on the upper surface of the melt.
  • this is achieved by causing static or periodically low- frequency magnetic fields to act, at at least two levels located one after the other in the casting direction, on the non-solidified portions of the cast strand while it is in the mould, and by causing at least one static or periodic low- frequency magnetic field to act at at least one level on the non-solidified portions of the cast strand while the cast strand is leaving the mould or immediately after the cast strand has left the mould.
  • the magnetic field is generated by means of magnetic-field generating devices, which may be in the form of permanent magnets and/or induction coils, supplied with current, with associated cores, and which are arranged adjacent two mould walls, located opposite to each other, to act across the inflowing melt.
  • These magnetic-field generating devices which may be in the form of permanent magnets or coils, supplied with current, with magnetic cores, will hereinafter in this application be referred to as magnets.
  • the magnets are adapted such that - at least one magnetic field is generated to act at a first level on the non-solidified portions of the cast strand in the upper part of the mould immediately downstream of the upper surface/the meniscus of the melt, and at a sufficient distance from the meniscus to ensure that upwardly-rising secondary flows are braked such that oscillations and the rate of flow of the melt are damped at the meniscus, while at the same time a channel with a limited and controlled flow of melt is main ⁇ tained adjacent to the meniscus,
  • At least one magnetic field is generated to act at a second level on the non-solidified portions of the cast strand in the mould downstream of the first magnetic field in the casting direction such that the incoming primary flow of melt is braked and split up into secondary flows, while
  • At least one magnetic field is generated to act at a third level on the non-solidified portions which remain in the cast strand while the cast strand is leaving the mould or immedia ⁇ tely after the cast strand has left the mould, whereby the depth of penetration of downwardly-directed secondary flows is reduced and the conditions for separation of the particles are improved.
  • the static or periodically low-frequency magnetic fields are generated close to the mould by means of magnets, since the magnets are adapted to generate magnetic fields which, in a manner described above, act at at least three levels.
  • the levels are arranged one after the other in the casting direc ⁇ tion to effectively brake and split up the primary flow of melt flowing into the mould and prevent the inflowing hot melt from penetrating, without being braked, deep down into the non-solidified portions, the sump, of the cast strand.
  • the magnetic fields control part of the hot melt to flow towards the upper surface such that a desirable con- trolled circulation of melt is obtained in the non-solidified portions of the cast strand.
  • the magnets are adapted to generate magnetic fields at three levels.
  • the levels are arranged one after the other in the casting direc ⁇ tion, and the magnetic field at the intermediate level is directed in the opposite direction to the magnetic fields at the two surrounding levels .
  • the above- described braking and splitting up of the incoming primary flow as well as the control of the secondary flow are obtained by arranging the magnets such that :
  • At least one magnetic field is generated to act, at a first level, downstream of the meniscus and upstream of the above- mentioned openings of the casting tube,
  • At least one magnetic field is generated to act, at a second level, downstream of the above-mentioned openings of the cas ⁇ ting tube, and
  • At least one magnetic field is generated to act, at a third level, adjacent to the outlet end of the mould, or immediately downstream of this outlet end.
  • the magnets are preferably arranged in magnetic circuits which are closed during casting.
  • these magnetic circuits comprise a magnetic return path, preferably in the form of an external magnet yoke. This results in the necessary magnetic flux balance in the circuits.
  • the magnets with associated poles, the magnetic fields and the yokes may be arranged such that a magnetic flux balance is obtained for each mould half or for parts of a mould.
  • the magnets are preferably adapted to generate two static or periodically low-frequency magnetic fields to act, at the same level, opposite to each other to jointly control the flow of melt over a cross section in the casting direction of the cast strand. This can be achieved with magnets of opposite polari ⁇ ty, arranged in pairs, whereby the two magnets included in a pair may be arranged at the same mould side or at mould sides opposite to each other.
  • the magnetic material included in the mould is preferably used as magnetic return path, whereby in many cases special magne- tic yokes are redundant in order to obtain magnetic circuits with magnetic flux balance.
  • the magnetic fields are generated, applied and controlled independently of each other. Likewise, the distribution of the strength and the propagation of the magnetic fields at the levels arranged across the cas ⁇ ting direction are controlled. This is achieved in a known way by varying the magnetic field strength, by using so-called pole plates of a magnetic material, and by changing the geo- metry of the pole. A change of the geometry of the pole may be achieved in a known manner by changing the distribution of magnetic material in a cross section of the permanent magnet or in the core of the coil supplied with current.
  • one or more magnets are arranged, at one or a plurality of levels, to generate static or periodically low-frequency magnetic fields with a distribution such that they act across essentially the whole width of the cast strand formed in the mould, that is, across essentially the whole long side of the mould.
  • This is achieved in a known way by arranging the magnets with poles which have a width which covers essentially the whole width of the cast strand formed in the mould, or by means of a pole plate arranged adjacent the magnets and the mould wall.
  • the pole plates extend preferably along the long sides of the mould. Behind the pole plates, one or a plurality of magnets may be arranged.
  • pole plates By the pole plates, magnetic fields are brought together and/or distributed to generate and apply a static magnetic field to act between the pole plates over essentially the whole width of the cast strand formed in the mould. Furthermore, with the pole plates the conditions for adapting the magnetic field to variations in the dimensions of the blank, for example the width of slabs during slabs casting, are improved.
  • the possibility of arranging static or periodically low-frequency magnetic fields to act, in accordance with the present invention, at three levels placed one after the other in the casting direction on the non-solidified portions of a cast strand is combined with a compact design.
  • This is achieved by means of a device in which at least two three- legged essentially E-shaped cores are arranged close to two confronting mould walls.
  • the E-shaped cores comprise magnets and are arranged with the back of the E-shaped core in parallel with the casting direction and with the free ends of the three legs directed towards the mould.
  • the free ends of the legs of the three-legged cores thus constitute magnetic poles, which are arranged at three levels arranged one after the other in the casting direction.
  • the magnetic pole at the intermediate level will have an opposite polarity relative to the magnetic poles at the two surrounding levels.
  • the three- legged cores comprise one or more magnets and parts which are made of a magnetic material but do not constitute a magnet .
  • Three different examples of alternative locations, designated A-E, E-B and E-C, of the magnets in the three-legged cores to achieve the pole distribution described above will now be described in more detail:
  • E-A comprises two magnets placed in the two outer legs and oriented such that the two outer poles have the same polarity and consequently such that the intermediate central leg has an opposite polarity.
  • E-B comprises, in the same way as A-E, two magnets which are placed on the back of the E-shaped core on respective sides of the central leg and facing each other with opposite poles; this results in a three-pole core with the desired pole distribution.
  • E-C comprises only one magnet placed in the central leg which, in the same way as E-A and E-B, results in the desired pole distribution.
  • a three-legged core in accordance with the description in the foregoing, comprises at least two coils supplied with current, each of these may advantageously be supplied from an independent rectifier, whereby the strength of the magnetic fields as well as their direction and distri- bution between the poles are controlled.
  • Flow is an inert phenomenon, with a time constant of 10 seconds or more, and therefore the strength and the direction of the static magnetic field may be advantageously adapted to vary in time, with a low frequency, to control the impulse of secondary flows arisen.
  • Figures 1 to 4 show embodiments of the invention applied to continuous casting.
  • a number of static or periodically low- frequency magnetic fields are arranged one after the other in the casting direction in order to brake and split up, during casting, an incoming primary flow of hot melt which is supplied to the mould, and to control the flow in non- solidified portions of a cast strand.
  • a primary flow of hot melt is supplied to a mould 11.
  • the casting process according to the Figures is a so-called closed casting where melt is supplied to the mould through a casting tube 12.
  • the invention may also be applied to so- called open casting when melt is supplied to the mould by means of a free tapping jet .
  • at least one cast strand 1 is formed in the mould 11.
  • the mould 11 is open in both ends of the casting direction.
  • the mould 11 is preferably arranged in the form of a chilled copper mould 11.
  • the casting tube 12 is arranged at its lower end with an arbitrary number of outlets 16, 16a, 16b directed in an arbitrary way.
  • 16a, 16b of the casting tube are preferably arranged centrally in the mould 11 to supply melt below the level where the meniscus 13 is located during steady state.
  • static or periodically low-frequency magnetic fields are adapted to act on the non-solidified portions of the cast strand at least two levels LI, L2 located one after the other in the casting direction while the cast strand 1 is in the mould 11.
  • magnets 15a, 15b, 150, 150a, 150b, 450a, 450b are adapted to generate at least one magnetic field to act at a first level LI.
  • the first level LI is located close to the upper surface of the melt, the menis ⁇ cus 13, to ensure that upwardly-directed secondary flows do not give rise to too strong a turbulence and wave formation close to the upper surface 13. This reduces the risk of slag being pulled down from the meniscus 13 and into the melt and creates good conditions for separation of non-metallic par ⁇ ticles.
  • this first level be located at a sufficient distance below the meniscus 13 so as not to elimi ⁇ nate this desired flow channel.
  • 250a, 250b, 550a, 550b are arranged to generate one or more static or periodically low-frequency magnetic fields to act at a second level L2 on the non-solidified portions of a cast strand while the cast strand 1 is in the mould 11.
  • Magnetic fields acting at this second level L2 are adapted to brake and split up the primary flow of incoming melt.
  • magnets 35a, 35b, 350, 350a, 350b, 650a, 650b are arranged to generate additionally at least one static or periodic low-frequency magnetic field to act at a third level L3.
  • Magnetic fields acting at this level L3 control the flow in the non-solidified portions which remain in the cast strand while the cast strand 1 is leaving the mould 11 or after the exit of the cast strand 1 from the mould 11.
  • a continuous casting mould 11 usually comprises cooled mould plates 11a, lib, lie, lid, preferably water-cooled copper plates.
  • the mould 11 is surrounded by water box beams which, in turn, are surrounded by a frame structure.
  • the magnetic fields which act on the non-solidified portions of a cast strand formed in the mould are generated by magnets in the form of permanent magnets or coils supplied with direct current.
  • the frame structure is provided with a magnetic return path 18a, 18b, 180, 180a, 180b, 280, 280a, 280b, 380, 380a, 380b, 480, 580, 680.
  • the return paths form a magnetic circuit.
  • the magnets, the magnetic fields and the return paths may be arranged such that circuits with magnetic flux balance are obtained for each mould half or for smaller parts of the mould 11.
  • the static magnetic fields 10 act over essentially the whole width of the cast strand 1 formed in the mould 11, the magnets 150, 250, 350,
  • 450a, 450b, 450a, 550b, 650a, 650b are arranged with a width which essentially corresponds to the width of the cast strand 1 formed in the mould 11, or the long side of the mould.
  • pole plates 455, 555, 655 are arranged close to two confronting sides of the mould 11.
  • the pole plates 455, 555, 655 are arranged so as to extend along the long sides of the mould 11.
  • one or more magnets 450a, 450b, 550a, 550b, 650a, 650b are arranged in the form of coils supplied with direct current, or permanent magnets. The fields from these magnets 15 are brought together and distri ⁇ ubbed to generate and apply a static or periodic low-frequency magnetic field which acts over essentially the width of the cast strand formed in the mould.
  • the magnets 15 may be arranged with cores which are sectioned. These sections are arranged in the form of both magnetic and non ⁇ magnetic core elements which may be removed and the section be left open. The same core element may be reinserted in its previous place or be replaced by a core element with other magnetic properties to change the propagation and strength of the magnetic field.
  • the core of the coil is arranged with core elements according to the above. In this way, the possibilities of controlling the strength and propa- ga ion of a magnetic field generated by means of the induction coil are increased.
  • a pole core is arranged between the permanent magnet and the mould, the pole core comprising magnetic and non- magnetic core elements which are inserted, removed, or repla ⁇ ced to change a magnetic field generated by means of the per ⁇ manent magnet .
  • melt is prevented from penetrating down into the cast strand in an unbraked manner, while at the same time the flow of the melt in non-solidified portions of the cast strand is controlled.
  • melt is prevented from penetrating down into the cast strand in an unbraked manner, while at the same time the flow of the melt in non-solidified portions of the cast strand is controlled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Procédé et dispositif employés au cours de la coulée d'un métal dans un moule (11) ouvert aux deux extrémités dans le sens de la coulée, qui reçoit un flux de coulée primaire. Le dispositif permet de réguler le flux de coulée dans les parties non solidifiées d'un filet de coulée (1) qui se forme dans le moule. Des champs magnétiques statiques ou périodiques à basse fréquence sont produits et agissent à au moins deux niveaux (L1, L2) successifs dans le sens de coulée, sur les parties non solidifiées du filet de coulée lorsque celui-ci se trouve dans le moule. Au moins un champ magnétique supplémentaire, statique ou périodique à basse fréquence, est produit et appliqué, agissant, sur au moins un niveau (L3), sur les parties non solidifiées qui demeurent dans le filet de coulée au moment où celui-ci sort du moule, ou immédiatement après.
PCT/SE1996/000241 1995-02-22 1996-02-21 Procede et dispositif de coulee dans un moule WO1996026029A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR9607263A BR9607263A (pt) 1995-02-22 1996-02-21 Método e um dispositivo apra fundir em um molde
EP96904426A EP0871554A1 (fr) 1995-02-22 1996-02-21 Procede et dispositif de coulee dans un moule
JP8525622A JPH11502466A (ja) 1995-02-22 1996-02-21 モールドで鋳造する方法および装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9500684-7 1995-02-22
SE9500684A SE503562C2 (sv) 1995-02-22 1995-02-22 Sätt och anordning för stränggjutning

Publications (1)

Publication Number Publication Date
WO1996026029A1 true WO1996026029A1 (fr) 1996-08-29

Family

ID=20397348

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000241 WO1996026029A1 (fr) 1995-02-22 1996-02-21 Procede et dispositif de coulee dans un moule

Country Status (7)

Country Link
EP (1) EP0871554A1 (fr)
JP (1) JPH11502466A (fr)
KR (1) KR19980702446A (fr)
CN (1) CN1181030A (fr)
BR (1) BR9607263A (fr)
SE (1) SE503562C2 (fr)
WO (1) WO1996026029A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999011404A1 (fr) * 1997-09-03 1999-03-11 Abb Ab Procede et dispositif pour la coulee continue ou semi-continue de metal
FR2772294A1 (fr) * 1997-12-17 1999-06-18 Rotelec Sa Equipement de freinage electromagnetique d'un metal en fusion dans une installation de coulee continue
RU2539253C2 (ru) * 2010-08-05 2015-01-20 Даньели Энд К. Оффичине Мекканике С.П.А. Способ и установка для регулирования потоков жидкого металла в кристаллизаторе для непрерывного литья тонких плоских слябов
WO2018014663A1 (fr) * 2016-07-22 2018-01-25 东北大学 Dispositif de freinage électromagnétique vertical permettant de réguler l'écoulement d'acier fondu dans un cristalliseur à coulée continue
US9901978B2 (en) 2013-03-28 2018-02-27 Evgeny Pavlov Method and apparatus for moving molten metal

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050045303A1 (en) * 2003-08-29 2005-03-03 Jfe Steel Corporation, A Corporation Of Japan Method for producing ultra low carbon steel slab
EP3415251A1 (fr) * 2017-06-16 2018-12-19 ABB Schweiz AG Système de frein électromagnétique et procédé de commande d'un système de frein électromagnétique
DE102018117304A1 (de) * 2018-07-17 2020-01-23 Ald Vacuum Technologies Gmbh Vorrichtung und Verfahren zum Schwebeschmelzen mit gekippt angeordneten Induktionseinheiten
CN111515519B (zh) * 2020-04-02 2021-07-30 燕山大学 一种异种板对焊电磁定量搅拌装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040383A1 (fr) * 1980-05-19 1981-11-25 Asea Ab Procédé et dispositif pour le brassage du métal liquide dans un lingot de coulée continue
US5381857A (en) * 1989-04-27 1995-01-17 Kawasaki Steel Corporation Apparatus and method for continuous casting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040383A1 (fr) * 1980-05-19 1981-11-25 Asea Ab Procédé et dispositif pour le brassage du métal liquide dans un lingot de coulée continue
US5381857A (en) * 1989-04-27 1995-01-17 Kawasaki Steel Corporation Apparatus and method for continuous casting

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 33, M-923; & JP,A,01 271 045 (NIPPON STEEL CORP), 30 October 1989. *
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 339, M-1001; & JP,A,02 117 756 (SUMITOMO METAL IND LTD), 2 May 1990. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999011404A1 (fr) * 1997-09-03 1999-03-11 Abb Ab Procede et dispositif pour la coulee continue ou semi-continue de metal
FR2772294A1 (fr) * 1997-12-17 1999-06-18 Rotelec Sa Equipement de freinage electromagnetique d'un metal en fusion dans une installation de coulee continue
WO1999030856A1 (fr) * 1997-12-17 1999-06-24 Rotelec S.A. Equipement de freinage electromagnetique d'un metal en fusion dans une installation de coulee continue
US6164365A (en) * 1997-12-17 2000-12-26 Rotelec (Societe Anonyme) Apparatus for electromagnetically braking a molten metal in a continuous casting mold
AU735023B2 (en) * 1997-12-17 2001-06-28 Rotelec S.A. Apparatus for electromagnetically braking a molten metal in a continuous casting plant
RU2539253C2 (ru) * 2010-08-05 2015-01-20 Даньели Энд К. Оффичине Мекканике С.П.А. Способ и установка для регулирования потоков жидкого металла в кристаллизаторе для непрерывного литья тонких плоских слябов
US9901978B2 (en) 2013-03-28 2018-02-27 Evgeny Pavlov Method and apparatus for moving molten metal
WO2018014663A1 (fr) * 2016-07-22 2018-01-25 东北大学 Dispositif de freinage électromagnétique vertical permettant de réguler l'écoulement d'acier fondu dans un cristalliseur à coulée continue

Also Published As

Publication number Publication date
KR19980702446A (ko) 1998-07-15
JPH11502466A (ja) 1999-03-02
BR9607263A (pt) 1997-12-30
SE9500684L (sv) 1996-07-08
CN1181030A (zh) 1998-05-06
EP0871554A1 (fr) 1998-10-21
SE503562C2 (sv) 1996-07-08
SE9500684D0 (sv) 1995-02-22

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