EP1419022A2 - Coulee continue de feuilles et des bandes de metal - Google Patents

Coulee continue de feuilles et des bandes de metal

Info

Publication number
EP1419022A2
EP1419022A2 EP02767821A EP02767821A EP1419022A2 EP 1419022 A2 EP1419022 A2 EP 1419022A2 EP 02767821 A EP02767821 A EP 02767821A EP 02767821 A EP02767821 A EP 02767821A EP 1419022 A2 EP1419022 A2 EP 1419022A2
Authority
EP
European Patent Office
Prior art keywords
gap
rolls
magnetic field
frequency
roll
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Withdrawn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
EP02767821A
Other languages
German (de)
English (en)
Inventor
Herman Branover
Ephim Golbraikh
Arkady Kapusta
Boris Mikhailovich
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.)
National Diversified Industries (Aust) Pty Ltd
Original Assignee
National Diversified Industries (Aust) Pty Ltd
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 National Diversified Industries (Aust) Pty Ltd filed Critical National Diversified Industries (Aust) Pty Ltd
Publication of EP1419022A2 publication Critical patent/EP1419022A2/fr
Withdrawn legal-status Critical Current

Links

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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams
    • B22D11/0662—Side dams having electromagnetic confining 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • the present invention relates to the casting of metal sheets and bands, and more particularly, to the continuous vertical casting of sheets between rotating roll-crystallizers.
  • U.S. Patent No. 4,936,374 (1990) which proposes the application of a horizontal, high-frequency magnetic field for metal containment in the working gap between rolls
  • U.S. Patent No. 4,974,661 (1990) which suggests a vertical, high-frequency magnetic field
  • U.S. Patent No. 5,495,886 (1996), featuring three vertical magnetic fields - a DC field, an AC high-frequency field, and an AC low-frequency field.
  • an apparatus for the continuous casting of metal sheets and bands comprising two rotatable roll-crystallizers having parallel axes located in the horizontal plane and defining between them a gap of adjustable width, and means for supplying metal melt to fill said gap; characterized by means for generating at least three substantially horizontal magnetic fields producing electromagnetic pressures adapted to act to contain at least one end face of said melt within said gap.
  • FIG. 1 is an elevational view of the apparatus according to the present invention, showing, on the left of the vertical center line, a cross-sectional view of one of the rolls, and, on the right, a view in the direction of arrows AA in Fig. 2;
  • Fig. 2 is a side view of the apparatus as- seen in the direction of arrow B in Fig. 1;
  • Figs. 3a-c represent three variants of the jacket enveloping the core;
  • Fig. 4 represents, to a larger scale, detail D of Fig. 5;
  • Fig. 5 is a perspective view of the C-shaped, high-frequency electromagnet;
  • Fig. 6 is a schematic top view of the apparatus, illustrating the arrangements of the magnetic fields and the connections of the various power supplies;
  • Fig. 7 is a perspective view, of one of the two supporting beams of the roll assembly, and
  • Fig. 8 is a perspective view of the laminate arrangement of the expanding magnetic cores.
  • Fig. 1 on the left of the vertical center line, a cross-sectional view of one of two roll-crystallizers 2, (hereinafter referred to as roll or rolls 2), having parallel axes lying in a horizontal plane.
  • Each of the rolls 2 comprises a core 4 made of non-magnetic steel with ducts 6 for the circulation of a liquid coolant; two stub axles 8 made of magnetic carbon steel with a central bore 10 communicating with ducts 6; jacket 12, made of a thermally highly conductive material, e.g., copper, and adapted to be cooled by the liquid coolant.
  • a thermally highly conductive material e.g., copper
  • Jacket 12 is shown to better effect in Figs. 3a-c, which represent three possible variants of the jacket.
  • a basic jacket 12 is shown in Fig. 3a, the inside surface of jacket 12 being provided with a plurality of equally spaced, axially directed grooves 13 which end in a manifold on both sides of roll 2 (Fig. 4).
  • a similar cooling effect can also be achieved by helical grooves 13.
  • Figs. 3b and 3c show variants in which the outer surface of jacket 12 is provided with U-profiled and trapezoidal grooves, respectively, into which are inserted electrically insulated copper bars 14, 14 ⁇ , having appropriate cross-sections. The purpose of these bars will become apparent further below.
  • Electromagnet 24 has a laminated, C-shaped core 26 and sloping pole faces 28. Windings 30 are made of copper tubing. Each of the poles of core 26 faces a laminated, annular armature 32, each armature being attached by means of screws 34 to flange 15 of the stub axle 8 of its roll 2.
  • Core 26 is slidably mounted on a bracket 35 (Fig. 1), which in turn is mounted on chassis 36.
  • bracket 35 Fig. 1
  • gap a between rolls 2 which determines the thickness of the cast sheet, can be altered without altering the air gap between armatures 32 and pole faces 28, by shifting core 26 in either direction of double arrow C.
  • Windings 30 of electromagnet 24 are connected to a high-frequency (2.5-10 kHz) source of a voltage 38 (Fig. 6).
  • coils 40 surrounding, but not touching, stub axles 8.
  • Each of coils 40 has either one or two electrically separate windings. In the coil variant having only one winding, the DC and AC circuits are separated by a capacitor.
  • sources of direct voltages 42 and low-frequency (5-100 Hz) alternating voltages 44 Fig. 6
  • two magnetic fields are generated in annular magnetic circuits 32, one field being a direct and the other, a low-frequency, alternating magnetic field.
  • Magnetic core 46 is slipped over, but does not touch, two adjacent stub axles 8 and is fixedly attached to the coil former of coils 40.
  • core 46 is designed to be expanding. Expansibility is achieved by simply intercalating stacked laminations of core 46, as is clearly seen in Fig. 8. Holes 50 serve to allow stub axles 8 to pass through.
  • Stub axles 8 are mounted in bearings supported in bearing housings 52, which also serve as inlet (left housing) and outlet (right housing).
  • Rolls 2 are each connected, via coupling 54, to a drive 55 comprising a worm reduction gear 56 and an electric motor 58.
  • arcuate stators 60 are installed, as shown in Fig. 2. These stators are connected to an -phase (m ⁇ 3) voltage source 62 (Fig. 6) of controllable frequency, voltage and sequence of phase switching.
  • Bearing housing 52 and drive 55 are mounted on beams 64, which are fitted with guides 66 consisting of female dovetails, guide rollers 68 freely rotating in bearing supports 70, and bracket 72 fixed to the bottom of frame beam 64 to which bracket nut 74 is attached. These are parts of the displacement mechanism of beam 64 with respect to chassis 36.
  • Chassis 36 includes guide rails 76 in the form of male dovetails matching the female dovetails of guides 66 on which the beams 64 rest, as well as screws 78 with handles 80 serving for the displacement of beams 64, and bracket 35 on which high-frequency electromagnets 24 are mounted.
  • the working position of rolls 2 with respect to chassis 36, which determines the thickness of a cast sheet, is fixed using bolted joint 82.
  • Liquid metal is fed to the apparatus by a vacuum- or MHD-pump 84, through a thermally insulated metal conduit 86 and ceramic distribution box 88.
  • the cast band or thin sheet is wound down using a puller strip 90, representing a steel band of a thickness corresponding to the thickness of the sheet to be case.
  • Strip 90 has recesses at its upper end in which the crystallizing metal is caught; the strip serves as a leader for winder 92.
  • the continuous casting apparatus operates as follows: Using screws 78, the required gap between rolls 2 is set, then the position of beams 64 is rigidly fixed using bolted joints 82. Puller strip 90 is attached at its lower end to the drum of winder 92, its upper end being inserted into the gap between rolls 2 and held in position by guide rollers 68. Then, using voltages 38, 42, 44, currents are applied to the electromagnet windings, which excite direct magnetic field B 3 and alternating magnetic fields. B t and B 2 in the zone of the anticipated location of the liquid layer end faces.
  • liquid metal is fed into the. gap between rolls 2 by means of pump 84 via metal conduit 86 and distribution box 88 and, while the gap is being filled, rolls 2 are driven up by drive 55 to the nominal speed.
  • the drum of winder 92 is driven up to a speed appropriate to the speed of rolls 2.
  • vertical currents Ji, J 2 are induced at the edges of the liquid layer by alternating magnetic fields B], B 2 .
  • the interaction of these currents with these fields results in the appearance of electromagnetic body forces fi, f 2 , acting within a thin surface layer in the direction parallel to the axes of the rolls. These forces generate electromagnetic pressure, counterbalancing the hydrostatic pressure of the liquid column and thus preventing liquid metal overflow from the end faces of the liquid layer in the gap.
  • arcuate stators 60 together with jackets 12 (Figs. 3b, 3c) can make the technological process even more controllable, in the following way:
  • a travelling magnetic field B 4 excited by arcuate stators 60, induces a travelling field of currents J 4 in rods 14, 14a. Since rods lying in the diametral plane of rolls 2 are connected pair-wise, forming frames, travelling magnetic fields B 5 are induced in the liquid metal filled working gap, with the direction of motion being determined by the sequence of phases of arcuate stators 60.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un appareil permettant de couler en continu des feuilles et des bandes de métal. Cet appareil comprend deux cristallisateurs rotatifs munis d'axes parallèles situés sur le plan horizontal et définissant entre eux un espace à largeur réglable et d'un dispositif servant à remplir ledit espace. L'appareil selon l'invention est caractérisé par un dispositif servant à générer au moins trois champs magnétiques sensiblement horizontaux produisant des pressions électromagnétiques qui permettent de contenir au moins une surface d'extrémité du métal fondu dans ledit espace.
EP02767821A 2001-08-19 2002-08-18 Coulee continue de feuilles et des bandes de metal Withdrawn EP1419022A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL14497201A IL144972A0 (en) 2001-08-19 2001-08-19 Continuous casting of metal sheets and bands
IL14497201 2001-08-19
PCT/IL2002/000679 WO2003015957A2 (fr) 2001-08-19 2002-08-18 Coulee continue de feuilles et des bandes de metal

Publications (1)

Publication Number Publication Date
EP1419022A2 true EP1419022A2 (fr) 2004-05-19

Family

ID=11075713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02767821A Withdrawn EP1419022A2 (fr) 2001-08-19 2002-08-18 Coulee continue de feuilles et des bandes de metal

Country Status (4)

Country Link
US (1) US20040237283A1 (fr)
EP (1) EP1419022A2 (fr)
IL (1) IL144972A0 (fr)
WO (1) WO2003015957A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101850405B (zh) * 2010-06-18 2011-09-28 江苏技术师范学院 模拟气膜连铸结晶器实验装置
BR112019002668B1 (pt) 2016-08-10 2022-07-26 Nucor Corporation Aparelho e método para fundição contínua de tira de metal; retentor de represa lateral e montagem de represa lateral para fundição contínua de tira de metal
CN106914489B (zh) * 2017-04-17 2018-07-13 燕山大学 一种制备梯度功能材料的轧制装置及方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974661A (en) * 1988-06-17 1990-12-04 Arch Development Corp. Sidewall containment of liquid metal with vertical alternating magnetic fields
US4936374A (en) * 1988-11-17 1990-06-26 The United States Of America As Represented By The United States Department Of Energy Sidewall containment of liquid metal with horizontal alternating magnetic fields
US5495886A (en) * 1994-04-29 1996-03-05 Inland Steel Company Apparatus and method for sidewall containment of molten metal with vertical magnetic fields
US5695001A (en) * 1996-03-20 1997-12-09 Inland Steel Company Electromagnetic confining dam for continuous strip caster

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03015957A3 *

Also Published As

Publication number Publication date
WO2003015957A2 (fr) 2003-02-27
IL144972A0 (en) 2002-06-30
WO2003015957A3 (fr) 2004-02-19
US20040237283A1 (en) 2004-12-02

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