EP0153205A1 - Verfahren und Vorrichtung zur Herstellung von dünnen Metall- und Halbmetallbändern - Google Patents

Verfahren und Vorrichtung zur Herstellung von dünnen Metall- und Halbmetallbändern Download PDF

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Publication number
EP0153205A1
EP0153205A1 EP85400063A EP85400063A EP0153205A1 EP 0153205 A1 EP0153205 A1 EP 0153205A1 EP 85400063 A EP85400063 A EP 85400063A EP 85400063 A EP85400063 A EP 85400063A EP 0153205 A1 EP0153205 A1 EP 0153205A1
Authority
EP
European Patent Office
Prior art keywords
blade
coils
magnetic field
nozzle
ferrite
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
EP85400063A
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English (en)
French (fr)
Other versions
EP0153205B1 (de
Inventor
Rémy de Framond
A. Reza Yavari
Claude Senillou
Jean-Charles Joud
Marcel Garnier
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.)
USINOR SA
Original Assignee
USINOR SA
Union Siderurgique du Nord et de lEst de France SA USINOR
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.)
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Publication date
Application filed by USINOR SA, Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical USINOR SA
Priority to AT85400063T priority Critical patent/ATE35637T1/de
Publication of EP0153205A1 publication Critical patent/EP0153205A1/de
Application granted granted Critical
Publication of EP0153205B1 publication Critical patent/EP0153205B1/de
Expired 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
    • 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
    • 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
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring

Definitions

  • the present invention relates to methods and devices for the production of ribbons, and more particularly metallic or semi-metallic thin, in particular such ribbons having a microcrystalline or amorphous structure.
  • the simplest method for manufacturing such thin metallic ribbons consists in projecting a jet of liquid metal onto a mobile substrate such as the surface of a metallic roller rotating at a circumferential speed greater than 10 m / second. This process is designated by the English expression "melt-spinning".
  • the major problem to be solved concerns the shape stability of the jet during its impact and its solidification on the substrate due to the relatively high impact speed, notably increased by the acceleration of gravity. It is moreover impossible to produce by this method ribbons of width greater than 1 cm.
  • a process is known which is described in particular in document FR-A-2 368 324 (77 31 659).
  • the liquid metal is made to flow through a slit whose width varies from 0.2 to 1 mm and whose length can be several centimeters.
  • This slot is placed at a distance from the mobile substrate which is less than 1 mm, and most often of the order of 0.1 mm, which overcomes the drawback of the first method mentioned above since the substrate on which the metal solidifies is at a very short distance from the slot through which the liquid metal flows.
  • this method also has serious drawbacks: it requires very specific and very severe conditions with regard to the machining and the surface condition of the lips delimiting the slot.
  • Document FR-A-82 06 876 describes a process according to which a jet of liquid metal of circular section is deformed by application of a magnetic field, until it takes the form of a ribbon or a blade parallel to this field.
  • this method requires a minimum forming time during which the magnetic field must act on the initial section of the metal, against the surface tension of the liquid, to deform this section until the desired final shape is obtained.
  • the liquid metal is subjected to the action of gravity, so that the formed blade reaches its useful width outside the zone of the magnetic field precisely when the maximum stabilizing action of the field would be necessary to maintain it in l 'state.
  • the blade thus formed can only have a limited width taking into account the rapid decrease of the magnetic fields in the air.
  • JP-A-57-17781 which subjects a metal strip formed on a heat exchanger substrate to the action of a magnetic field created in an area close to the point of solidification of the metal.
  • This magnetic field has a direction perpendicular to the direction of advancement of the metal blade and the field lines pass through it. It is clearly indicated and explained that the aim is to increase the viscosity by braking action on the fluid particles, which imposes a low frequency continuous or alternating field penetrating the mass of the fluid flow.
  • this type of field penetrating the metallic flow vein exerts an almost zero stabilizing action on the shape instabilities which have been defined previously under a, b and c and which the present invention aims precisely to combat in the formation of 'a metal strip to be projected onto the heat exchange substrate.
  • None of the known methods therefore makes it possible to obtain, without placing the crucible at a distance of less than 1 mm from the mobile substrate, a wide ribbon with regular dimensions.
  • the purpose of this invention is precisely to provide an original method and device for obtaining such a product while freeing itself from the constraints which, in the second method analyzed above, relate to the production of the lips of the slot and wear of these.
  • the main object of the invention is a process for producing, from an electroconductive liquid, a ribbon, of the type in which it is made to flow from a reservoir, through a nozzle. , a molten material, to form a blade of substantially rectangular cross section which is then solidified, characterized in that the shape of the blade of liquid material is stabilized, after its shaping and before solidification, by a surface mechanical effect induced by an alternating magnetic field.
  • the subject of the invention is also a device for implementing the process, as defined above, of the type comprising a reservoir containing a molten material and comprising at its lower part a nozzle for the flow of this material, and downstream of the tank means for forming a blade and solidifying the latter, characterized in that it comprises, in the zone situated between the means for forming the blade and the solidifying means, electromagnetic means suitable for exert on the surface of the blade a mechanical stabilizing effect generated by an alternating magnetic field.
  • the inductors according to the present invention capable of providing an adequate geometry of the magnetic fields, that the effect of an alternating magnetic field of given frequency on the stability of a strip of liquid electroconductive material is to oppose disturbances which would tend to separate the faces of the blade from their geometric position of plane and parallel jet.
  • This stabilizing effect is selective with respect to disturbances insofar as only the waves whose wrinkles are perpendicular to the direction of the magnetic field are reduced, since it is zero for disturbances whose wrinkles are parallel to the magnetic field.
  • this effect is all the more important the higher the frequency of the alternating magnetic field.
  • the frequency of the alternating magnetic fields used to reduce the instabilities of the blade must be such that the depth of penetration into the material constituting the liquid blade is as small as possible so as to obtain a mechanical effect located on the surface of the blade where they appear disturbances.
  • the electrical conductivity of metals and semi-metals in the liquid state places the frequency range between 3 kHz and 3,000 kHz.
  • the invention will be described below with reference to the manufacture of metallic, semi-metallic or amorphous ribbons, but is not limited thereto and relates to any manufacture of a ribbon from an electroconductive material.
  • FIG. 1 shows a device comprising a reservoir 11 which can contain a metallic or semi-metallic molten material.
  • This tank is surrounded by heating means 12, for example, induction.
  • This reservoir ends at its lower part with at least one slot-shaped nozzle 13 whose section corresponds to the shape of the liquid blade that we want to get.
  • this slot may have a rectangular shape, with a width of 0.7 mm and a length of 20 mm.
  • a wheel 14 which can be in drag in rotation and whose width is greater than the length of the slot 13.
  • the surface 15 of this wheel constitutes a substrate on which the metal blade will cool very quickly.
  • the distance between the outlet of the slot and the surface of the substrate is greater than the width of the slot and preferably greater than 1 mm.
  • the surface of the substrate is provided so as to allow easy detachment of the solidified tape 16. It can be cooled by any suitable means (not shown) and driven with a speed of rotation such that its speed is tangential to the point of reception of the molten material. is compatible with that of the flow of the blade and can be of the order of 20 m per second.
  • means are arranged making it possible to generate in this zone an alternating magnetic field exerting a mechanical stabilizing effect on the faces of the blade 17 of liquid material leaving the nozzle.
  • These means comprise, in the example chosen, two coaxial coils 18 made of an electrically conductive material, for example copper, the axis of these coils being arranged parallel to the slot 13, and consequently parallel to the blade 17 and orthogonally to the longitudinal axis of the latter. The axis of the coils is even preferably contained in the plane of this blade. Both coils can be cooled, as is known in the art.
  • a core of ferrite or equivalent material 19 which can also be cooled, is placed inside each coil coaxially to concentrate the intensity of the magnetic field towards the liquid material leaving the slot.
  • the coils are supplied by alternating currents of appropriate frequency, so that the ends 19a opposite the blade 17 of the opposite ferrite cores 19 are opposite poles.
  • the two coils can be supplied with alternating currents having a frequency between 3 and 3,000 kHz, for example of the order of 400 kHz, the intensity of the field produced being between 1 and 1,000 millitesla.
  • the width of the ribbon obtained corresponds to that of the slot, ie 20 mm and its thickness is approximately 0.07 mm. It is obtained from a rectangular slot of 20.0 x 0.6 mm by contacting a substrate in the form of a wheel whose tangential speed is 20 m / s.
  • induction coils 28 and ferrite cores 29 arranged inside these coils.
  • the coils are coaxial and have their common axis perpendicular to the plane of the blade 27 leaving the nozzle.
  • the ferrite cores have a rectangular cross-section and have their ends arranged a few millimeters from the liquid metal blade.
  • the coils are supplied by alternating currents such that the ends 29a opposite the blade of the opposite ferrite cores are similar poles, that is to say, either both of the north poles, or both of them south poles.
  • the two field coils can be supplied with alternating current with a frequency of 500 kHz.
  • the intensity of the field can be between 1 and 1,000 millitesla.
  • the nozzle slot can have a length of the order of 45 mm and a width of 0.7 mm.
  • the distance between the outlet of the nozzle and the substrate can be of the order of 10 mm. In this case, assuming that the speed of this substrate, in a direction perpendicular to the direction of arrival of the liquid blade is 15 m per second, we obtain a ribbon of width 45 mm and thickness of the order 0.1 mm.
  • a blade 31 of preformed liquid metallic material is sent between a first pair of coaxial induction coils 32a, 32b placed on either side of the blade 31, so that their common axis is perpendicular to the plane of the blade.
  • a second pair of coaxial induction coils 33a, 33b, parallel to the first pair of coils 32a, 32b is arranged on the same vertical line and below the coils 32.
  • a U-shaped ferrite core 34a is housed between the coils 32a and 33a located on the same side of the blade so that each branch of the U, respectively 35a and 36a, enters the coils 32a and 33a.
  • the coils 32a and 33a are supplied by alternating currents so that the opposite ends of the blade of the branches 35a and 36a of the ferrite 34a are opposite poles.
  • the end of the branch 35a is a north pole and the incident magnetic field lines coming from this pole are directed perpendicularly to the blade, then looped by first following a direction parallel to the blade going towards the branch 36a which is a south pole, opposite which they are reoriented perpendicular to the blade 31 and finally channeled by the U-shaped ferrite 34a to the north pole 35a.
  • the alternating supply current is a high frequency current similar to that previously mentioned.
  • a core of ferrite core 34b similar to the U-shaped 34a is inserted between the coils 32b and 33b which are supplied so that the pole ends 35a, 35b or 36a, 36b ferrite opposite the blade of the same pair 32a, 32b or 33a, 33b, are similar poles.
  • 35a and 35b are north poles and 36a and 36b are south poles.
  • the looping which has just been explained previously for a vertical direction can, according to another embodiment of this variant, be carried out horizontally with a ferrite of similar structure in U shape and an opposition of the poles at each end of the branches of the U next to the blade.
  • FIG. 4 which schematically only represents the alternation of the poles opposite the same face of the blade, a combination of vertical and horizontal looping of the magnetic field is carried out which offers the maximum stabilizing effect of the blade in all the directions of the plan.
  • the alternation of the poles in the horizontal direction and the vertical direction is such that two adjacent poles are always opposite.
  • FIG. 3A The basic configuration of FIG. 3A can be translated in a direction parallel to the blade, as described above, when the width of the latter becomes very large.
  • the arrangement of the coils allows a diversification of the direction of the lines of fields and thus allows the stabilization of waves from different directions. This stabilization technique knows no limits as to the width of the blade to be stabilized.
  • the ferrite core has the shape of a mesh network similar to a grid on each vertex. meshes from which branches extend extending close to the blade and carrying an inductor coil suitably supplied.
  • this embodiment which makes it possible to widen the stabilization zone while retaining an all the more intense magnetic field, it is possible to coalesce at least two individual blades 51 and 52 shown in FIG. 5, along their common longitudinal edge 53 to obtain a blade of greater width perfectly stabilized.
  • This embodiment also allows the creation of a very wide blade from cylindrical jets 54 and 55 from nozzles of circular section, by preforming the blade between the induction coils greater than 32a and 32b in FIG. 3A, before stabilization.
  • This stabilization can be obtained between a single pair of coils or between other pairs of coils placed below and next to it according to a repetitive diagram of the type of that described in FIG. 4.
  • ⁇ must be of the order of e and preferably ⁇ e / 2.
  • the blade thus formed is then stabilized by the phenomenon described above.
  • the advantage of such an inductor lies in the fact that the coils are always very close to the metal, which is very important due to the rapid decrease in the intensity of the magnetic field in the air.
  • a micrometric adjustment device can be associated with the two half-inductors thus allowing the approach of the latter near the blade or the slight offset relative to the formed blade thus acting as guide of the blade relative to a point of impact given.
  • FIG. 6 comprises a reservoir or crucible 61 surrounded by an induction heating device 62 and ending at its lower part by a nozzle 63 delimiting a slot of substantially rectangular shape.
  • the magnetic device making it possible to stabilize the shape of the liquid blade leaving this reservoir can be as described above and shown in FIG. 3A.
  • the essential originality of this third embodiment concerns the cooling substrate.
  • the latter is here produced in the form of two conveyor belts 64 passing over drive rollers 65a and over return rollers 65b and 65c. These two strips have two vertical strands 64a included here between the return rollers 65b, 65c and which are arranged face to face, in the extension of the slot of the nozzle 3. These two strands are therefore parallel to the liquid blade 67 leaving the nozzle and move in the same direction as this blade. The latter is thus received between the two receiving bands while being effectively controlled and the solidified tape 6 6 is easily extracted from the lower part of the device.
  • the conveyor belts acting as a cooling substrate can be cooled by suitable means, not shown.
  • the tape can have improved dimensional stability, taking into account the guiding between the two adjacent strips 64a.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Soft Magnetic Materials (AREA)
  • Electroluminescent Light Sources (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
EP85400063A 1984-01-18 1985-01-15 Verfahren und Vorrichtung zur Herstellung von dünnen Metall- und Halbmetallbändern Expired EP0153205B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400063T ATE35637T1 (de) 1984-01-18 1985-01-15 Verfahren und vorrichtung zur herstellung von duennen metall- und halbmetallbaendern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8400747A FR2558085B1 (fr) 1984-01-18 1984-01-18 Procede et dispositif pour l'elaboration de rubans metalliques et semi-metalliques de faible epaisseur
FR8400747 1984-01-18

Publications (2)

Publication Number Publication Date
EP0153205A1 true EP0153205A1 (de) 1985-08-28
EP0153205B1 EP0153205B1 (de) 1988-07-13

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ID=9300247

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EP85400063A Expired EP0153205B1 (de) 1984-01-18 1985-01-15 Verfahren und Vorrichtung zur Herstellung von dünnen Metall- und Halbmetallbändern

Country Status (7)

Country Link
US (1) US4762653A (de)
EP (1) EP0153205B1 (de)
JP (1) JPS60158958A (de)
AT (1) ATE35637T1 (de)
CA (1) CA1236264A (de)
DE (1) DE3563701D1 (de)
FR (1) FR2558085B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0386394A1 (de) * 1989-03-10 1990-09-12 ANSALDO S.p.A. Verfahren und Vorrichtung zur Herstellung dicker, amorpher Stahlbänder
EP0408453A1 (de) * 1989-07-12 1991-01-16 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Vorrichtung für eine elektromagnetische Giessdüse zum Regeln eines Flüssigmetallstrahles

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632115A1 (fr) * 1988-05-30 1989-12-01 Ugine Aciers Inducteur pour dispositif de mise en forme de metal liquide par des forces electromagnetiques
US4974661A (en) * 1988-06-17 1990-12-04 Arch Development Corp. Sidewall containment of liquid metal with vertical alternating magnetic fields
DE3829810A1 (de) * 1988-09-02 1990-03-15 Leybold Ag Verfahren und vorrichtung zum senkrechten abgiessen von metallschmelzen
US4982796A (en) * 1988-10-18 1991-01-08 Arch Development Corp. Electromagnetic confinement for vertical casting or containing molten metal
US4905756A (en) * 1988-10-18 1990-03-06 United States Department Of Energy Electromagnetic confinement and movement of thin sheets of molten metal
US5954118A (en) * 1988-11-17 1999-09-21 Arch Development Corporation Apparatus for efficient sidewall containment of molten metal with horizontal alternating magnetic fields utilizing low reluctance rims
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
EP0586732B1 (de) * 1992-06-22 1998-03-25 Inland Steel Company Vorrichtung und Verfahren zum Eindämmen flüssigen Metalls durch Magnetismus
US5197534A (en) * 1991-08-01 1993-03-30 Inland Steel Company Apparatus and method for magnetically confining molten metal
US5251685A (en) * 1992-08-05 1993-10-12 Inland Steel Company Apparatus and method for sidewall containment of molten metal with horizontal alternating magnetic fields
US5487421A (en) * 1994-06-22 1996-01-30 Inland Steel Company Strip casting apparatus with electromagnetic confining dam
AU714976B2 (en) * 1996-04-29 2000-01-13 Bhp Steel (Jla) Pty Limited Magnetic braking
US6059015A (en) * 1997-06-26 2000-05-09 General Electric Company Method for directional solidification of a molten material and apparatus therefor
EP2350333A1 (de) * 2008-09-23 2011-08-03 Siemens Vai Metals Technologies SAS Verfahren und vorrichtung zum ablassen von flüssigem beschichtungsmetall am ausgang eines tempermetallbeschichtungstanks
DE102013105371B4 (de) * 2013-05-24 2021-02-25 BinNova GmbH & Co. KG Verfahren zum Herstellen mikrofeiner Fasern und Vorrichtung zur Durchführung des Verfahrens

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368324A1 (fr) * 1976-10-22 1978-05-19 Allied Chem Procede et dispositif de coulee continue pour produire des bandes metalliques continues
FR2525508A1 (fr) * 1982-04-21 1983-10-28 Centre Nat Rech Scient Procede d'elaboration de rubans ou lames metalliques liquides minces destines notamment a realiser des rubans ou des toles metalliques solides, minces, de preference amorphes, et dispositif pour la mise en oeuvre de ce procede

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JPS5717781A (en) * 1980-06-25 1982-01-29 Nitto Electric Ind Co Plastic lining method for liquid storage tank
US4485839A (en) * 1980-10-22 1984-12-04 Allegheny Ludlum Steel Corporation Rapidly cast alloy strip having dissimilar portions
JPS57177861A (en) * 1981-04-27 1982-11-01 Nippon Kokan Kk <Nkk> Production of metallic plate
US4469165A (en) * 1982-06-07 1984-09-04 Olin Corporation Electromagnetic edge control of thin strip material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368324A1 (fr) * 1976-10-22 1978-05-19 Allied Chem Procede et dispositif de coulee continue pour produire des bandes metalliques continues
FR2525508A1 (fr) * 1982-04-21 1983-10-28 Centre Nat Rech Scient Procede d'elaboration de rubans ou lames metalliques liquides minces destines notamment a realiser des rubans ou des toles metalliques solides, minces, de preference amorphes, et dispositif pour la mise en oeuvre de ce procede

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 24, (M-189) [1169], 29 janvier 1983; & JP - A - 57 177 861 (NIPPON KOKAN K.K.) 01-11-1982 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0386394A1 (de) * 1989-03-10 1990-09-12 ANSALDO S.p.A. Verfahren und Vorrichtung zur Herstellung dicker, amorpher Stahlbänder
EP0408453A1 (de) * 1989-07-12 1991-01-16 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Vorrichtung für eine elektromagnetische Giessdüse zum Regeln eines Flüssigmetallstrahles
FR2649625A1 (fr) * 1989-07-12 1991-01-18 Snecma Dispositif de busette electromagnetique pour le controle d'un jet de metal liquide
US5074532A (en) * 1989-07-12 1991-12-24 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." Electro-magnetic nozzle device for controlling a stream of liquid metal tapped from a crucible

Also Published As

Publication number Publication date
CA1236264A (en) 1988-05-10
DE3563701D1 (en) 1988-08-18
FR2558085A1 (fr) 1985-07-19
EP0153205B1 (de) 1988-07-13
US4762653A (en) 1988-08-09
FR2558085B1 (fr) 1987-05-15
ATE35637T1 (de) 1988-07-15
JPS60158958A (ja) 1985-08-20

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