WO2002074472A1 - Dispositif pour la coulee continue de metal - Google Patents

Dispositif pour la coulee continue de metal Download PDF

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Publication number
WO2002074472A1
WO2002074472A1 PCT/SE2002/000511 SE0200511W WO02074472A1 WO 2002074472 A1 WO2002074472 A1 WO 2002074472A1 SE 0200511 W SE0200511 W SE 0200511W WO 02074472 A1 WO02074472 A1 WO 02074472A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
magnetically conducting
magnets
melt
casting
Prior art date
Application number
PCT/SE2002/000511
Other languages
English (en)
Other versions
WO2002074472A8 (fr
Inventor
Tord Kroon
Conny Svahn
Original Assignee
Abb 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 Abb Ab filed Critical Abb Ab
Publication of WO2002074472A1 publication Critical patent/WO2002074472A1/fr
Publication of WO2002074472A8 publication Critical patent/WO2002074472A8/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

Definitions

  • the present invention relates to a device for continuous or semicontinuous casting of metals, comprising an electromagnetic brake that includes at least one downwardly open mould that is adapted to be supplied with an incoming primary flow of melt. Magnets are adapted to generate at least one static or periodic low-frequency magnetic field to act in the path of the inflowing melt and to split up the primary flow as well as to control possible secondary flows.
  • a chilled mould which is open at both ends in the casting direction.
  • the continuous cast material is usually designated cast strand.
  • melt flows into a mould.
  • the melt is cooled so that a solidified self- supporting surface layer is formed before the cast strand leaves the mould. If inflowing melt is allowed to flow into the mould in un uncontrolled manner, it will penetrate deep down into the non-solidified portions of the cast strand. This makes the separation of unwanted particles, contained in the melt, difficult.
  • the self-supporting surface layer is weakened, which increases the risk of melt breaking through the surface layer formed in the mould.
  • the static or periodic low-frequency magnetic field is generated by magnetic field-generating means, also called an electromagnetic brake, which may comprise permanent magnets or coils, supplied with current, with magnetic cores.
  • the cast strand is formed by melt running down into the mould, which is open in the downward direction.
  • the cast strand which after the mould shall have a largely rectangular cross section, is formed by allowing the melt to flow into a tube-like chilled mould which is present in the mould and has a corresponding rectangular cross section.
  • the walls of the casting mould usually consist of four separate copper plates.
  • the copper plates are each fixed to a water box beam.
  • the task of the water box beam is partly to stiffen the copper plates and partly to enclose circulating cooling water together with the copper plate.
  • a magnetic return path is required, preferably a yoke of carbon steel or some other magnetic material, which is connected to that part of the cores which is directed away from the mould, the rear end.
  • the mould with magnets rests on a jarring table. To prevent the solidified melt from adhering to the mould, an oscillating movement is imparted to the jarring table.
  • each continuous casting machine is associated with a plurality of moulds. Since the cores are arranged close to the mould and the water box beam is attached to the copper plates, it is usually a difficult and time-consuming operation to replace the mould.
  • the object of the invention is to produce a device for continuous or semicontinuous casting of metals comprising an electromagnetic brake that is arranged such that the mould may be removed in a simple manner and be replaced by a new mould.
  • magnetic cores and yokes shall be arranged in such a way that the electromagnetic brake is as compact as possible that the oscillating weight on the jarring table is as small as possible.
  • Figure 1 shows a cross section of a continuous casting machine wherein the magnet is arranged movable in a plane substantially coinciding with the horizontal plane.
  • Figure 2 shows a view from above of the continuous casting machine of Figure 1.
  • Figure 3 shows a view from above of a continuous casting machine wherein the magnet is divided into two separate parts, the respective two parts being arranged to be movable
  • Figures 1 and 2 show an embodiment of a device for continuous casting of metals, which among other things comprises a down- wardly open mould in the form of cooled copper plates la, lb, which form a chilled casting mould with a rectangular cross section.
  • the copper plates la, lb are each fixed to a water box beam 2, which is arranged outside the copper plates to cool and support the copper plates.
  • a cast strand 3 is formed by supplying liquid metal to the mould.
  • the molten metal is supplied to the mould either by open casting or closed casting, that is, with a casting pipe immersed into the melt.
  • Magnets 4 are arranged outside and close to each of the long sides la of the mould.
  • the magnets 4 are adapted to generate at least one static or periodic low-frequency magnetic field that acts across the molten metal in the mould. The magnetic field acts in the path of the inflowing melt and splits up the primary flow and checks any secondary flows arising.
  • Each magnet comprises at least one magnetically conducting body, a core 5, 6, 7, 8. On each one of the cores, a winding 9, 10, 11, 12 of an electric conductor is arranged.
  • the magnetically conducting cores 5, 6, 7, 8 on each long side of the mould are connected to a yoke 13, which is preferably part of the magnet 4.
  • the magnetically conducting cores are arranged in pairs on opposite sides of the long sides la of the mould and cover essentially the whole width of the mould, except for a portion in the centre of the long side of the mould.
  • the magnet 4 also comprises a rear part 14.
  • the rear part may be made of the same material as the cores 5, 6, 7, 8 and/or the yoke 13.
  • the rear part of the magnet 4 is made of a non-magnetically conducting material and/or is hollow in order to minimize the weight and the cost of the material on the rear part 14.
  • the rear part 14 is preferably journalled in guide means, such as rollers 15, linear bear- ings, or bushings.
  • the rear part is preferably connected to, for example, a structure 16 arranged on the side of the casting device.
  • the magnet 4 is also connected to at least one operating member 17, which is preferably connected to the structure 16.
  • the operating device 17 is adapted to move the magnet 4 to a desired position.
  • the operating member 17 is arranged as a cylinder, a periscopic arm, or a rack.
  • the magnet 4 is moved to the desired position by adapting the length of the operating member 17 to the desired position.
  • the device comprises means to give the mould an oscillating movement, preferably in the form of a jarring table 7.
  • the magnet 4 By arranging the magnet 4 to be movable in a plane, which according to a preferred embodiment substantially coincides with the horizontal plane, replacement of the mould is facilitated. For example, when the mould has to be removed for maintenance, or if a new size of the mould is to be used in the next casting operation. When the mould is replaced by a new mould, the magnet is moved away from the mould, which facilitates replacement of the mould. When the mould has been replaced, the magnet 4 is moved back in a simple manner to its position near the wall of the mould. This also makes it possible to use the same four coils for different mould plates la, lb.
  • the plane along which the magnet 4 is movable is arranged at an angle to the horizontal plane, where the angle extends preferably between 0 and 30 degrees from the horizontal plane.
  • the magnet 4 is moved with or without coils, the coils being either secured to the magnetically conducting cores according to Figure 1 or detachably arranged around the magnetically conducting cores (not shown) . Where the coils are detachably arranged around the cores, they are fixed to an external device indirectly connected to the structure 16.
  • the magnetically conducting cores 5, 6, 7, 8 comprise their own magnetic circuits, no external yoke is needed, which saves space and weight.
  • the internal yoke 13 also facilitates the mounting of the windings 9, 10, 11, 12 compared with the case where an external yoke is needed.
  • the magnet 4 is tiltable at a vertical angle (not shown) after the magnet having first been moved substantially horizontally out from the mould wall .
  • the magnet 4 is divisibly arranged between the cores 5 and 6 and/or between the cores 7 and 8.
  • the respective magnet halves 18, 19, 20, 21 are then preferably each connected to an operating member 22 that is connected to the surrounding building 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

La présente invention concerne un dispositif pour la coulée continue de métal, comportant un frein électromagnétique qui comprend au moins un moule s'ouvrant vers le bas comprenant de plaques de cuivre refroidies (1a, 1b) formant un moule de coulée trempé à froid à section transversale rectangulaire, dans lequel le moule est apte à être alimenté par un écoulement primaire de matière fondue d'arrivée. Des aimants (4) sont adaptés à générer au moins un champ magnétique de basse fréquence statique ou périodique pour agir dans le trajet de la matière fondue d'arrivée et pour séparer l'écoulement primaire ainsi que pour contrôler des écoulements secondaires éventuels. Chaque aimant (4) comporte au moins une âme de conduction magnétique (5, 6, 7, 8) et au moins une culasse (13), qui conjointement avec les âmes à conduction magnétique constitue un circuit magnétique. Les âmes à conduction magnétique sont disposées à proximité des grands côtés (1a) du moule et les aimants (4) sont disposés de manière à être mobiles dans un plan.
PCT/SE2002/000511 2001-03-21 2002-03-18 Dispositif pour la coulee continue de metal WO2002074472A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0101018-0 2001-03-21
SE0101018A SE0101018L (sv) 2001-03-21 2001-03-21 Anordning vid kontinuerlig gjutning av metall

Publications (2)

Publication Number Publication Date
WO2002074472A1 true WO2002074472A1 (fr) 2002-09-26
WO2002074472A8 WO2002074472A8 (fr) 2003-05-01

Family

ID=20283490

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2002/000511 WO2002074472A1 (fr) 2001-03-21 2002-03-18 Dispositif pour la coulee continue de metal

Country Status (2)

Country Link
SE (1) SE0101018L (fr)
WO (1) WO2002074472A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113365758A (zh) * 2019-01-30 2021-09-07 Abb瑞士股份有限公司 连铸中的流速控制

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994016844A1 (fr) * 1993-01-19 1994-08-04 Asea Brown Boveri Ab Dispositif de coulee continue dans un moule
JPH08229647A (ja) * 1995-02-28 1996-09-10 Kawasaki Steel Corp 鋼の連続鋳造方法
JPH0957401A (ja) * 1995-08-25 1997-03-04 Kawasaki Steel Corp 連続鋳造鋳型の電磁ブレーキ装置
US5613548A (en) * 1994-08-22 1997-03-25 Sms Schloemann-Siemag Aktiengesellschaft Continuous casting plant for casting thin slabs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994016844A1 (fr) * 1993-01-19 1994-08-04 Asea Brown Boveri Ab Dispositif de coulee continue dans un moule
US5613548A (en) * 1994-08-22 1997-03-25 Sms Schloemann-Siemag Aktiengesellschaft Continuous casting plant for casting thin slabs
JPH08229647A (ja) * 1995-02-28 1996-09-10 Kawasaki Steel Corp 鋼の連続鋳造方法
JPH0957401A (ja) * 1995-08-25 1997-03-04 Kawasaki Steel Corp 連続鋳造鋳型の電磁ブレーキ装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113365758A (zh) * 2019-01-30 2021-09-07 Abb瑞士股份有限公司 连铸中的流速控制
CN113365758B (zh) * 2019-01-30 2023-04-21 Abb瑞士股份有限公司 用于控制金属连铸结晶器中的流速的装置和相关系统

Also Published As

Publication number Publication date
SE0101018D0 (sv) 2001-03-21
SE0101018L (sv) 2002-09-22
WO2002074472A8 (fr) 2003-05-01

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