EP0044786B1 - Verfahren und Vorrichtungen zur Herstellung dünner, gehärteter Bänder durch kontinuierliches Giessen - Google Patents

Verfahren und Vorrichtungen zur Herstellung dünner, gehärteter Bänder durch kontinuierliches Giessen Download PDF

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Publication number
EP0044786B1
EP0044786B1 EP81401145A EP81401145A EP0044786B1 EP 0044786 B1 EP0044786 B1 EP 0044786B1 EP 81401145 A EP81401145 A EP 81401145A EP 81401145 A EP81401145 A EP 81401145A EP 0044786 B1 EP0044786 B1 EP 0044786B1
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EP
European Patent Office
Prior art keywords
strip
box
ribbon
enclosure
metal
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.)
Expired
Application number
EP81401145A
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English (en)
French (fr)
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EP0044786A1 (de
Inventor
Pascal Fournier
Jean-Claude Peraud
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Pont a Mousson SA
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Pont a Mousson SA
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Publication date
Application filed by Pont a Mousson SA filed Critical Pont a Mousson SA
Publication of EP0044786A1 publication Critical patent/EP0044786A1/de
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Publication of EP0044786B1 publication Critical patent/EP0044786B1/de
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C45/00—Amorphous alloys
    • 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
    • B22D11/005—Continuous casting of metals, i.e. casting in indefinite lengths of wire

Definitions

  • the invention relates to the manufacture of thin ribbons by brutal casting and freezing, on a cold substrate running continuously, at high speed. It concerns in particular the obtaining of metallic materials, in the vitreous state, according to a process generally designated by the term of hyperhardening.
  • such an amorphous structure is obtained by projecting a jet of molten metal, which spreads out in the form of a very thin layer, on a cooled surface, good conductor of heat and moving at high speed.
  • the latter aims to overcome these difficulties in using the hyper-tempering process on a moving strip, with a view in particular to implementing it under a controlled atmosphere, possibly under reduced pressure. It provides precise positioning of the moving strip, making it possible to make its vibrations negligible, while at least partly ensuring its cooling.
  • the device used according to document FR-A-2382297 which comprises a mold for continuous casting of metal plates consisting of two parallel metal strips hydrostatically guided, which pass vertically from top to bottom, and two block chains, driven at the same speed as the bands, said blocks serving to laterally delimit the space available for the meta! liquid.
  • the liquid cushions supporting said bands have essentially the function of opposing the hydrostatic pressure of the molten metal contained in said mold, in order to avoid deformation and mechanical friction, and of applying said strips against said blocks, in order to ensure the lateral sealing of the mold.
  • the invention also relates to a method of manufacturing thin metallic ribbons by spraying a jet of molten metal or metal alloy onto a cold substrate moving at high speed, the impact of the jet and the forming of the ribbon. in contact with the substrate being carried out in an atmosphere under reduced pressure compared to atmospheric pressure, according to which before the temperature of the ribbon reaches the vitrification temperature of said metal or metal alloy, the ribbon is brought into an atmosphere greater than said reduced pressure.
  • the invention also relates to a device for hyper-dipping a metal or a metal alloy, during its shaping of thin ribbon by projection of a jet of said metal or metallic alloy in fusion on a mobile substrate moving at high speed at below a metal jet ejection orifice, said orifice and the area of the mobile substrate receiving the impact of the jet being arranged inside an enclosure comprising means for ensuring control of the nature and the pressure of the atmosphere in said enclosure according to which said substrate consists of a strip facing at least one of the faces of which and in the vicinity of the impact zone, is disposed at least one box comprising at least one orifice for ejecting a pressurized fluid, advantageously gaseous and at low temperature, creating between said box and said strip a fluid cushion ensuring, by Coanda effect, its maintenance without mechanical friction against said box, in the prec position ise with respect to it, and with respect to an entry slit and to an exit door having an internal threshold allowing the passage of said strip for, respectively, its entry and exit from said enclosure.
  • such a box is arranged upstream of the impact zone of the molten metal and, moreover, advantageously situated opposite the impact face, so as to be able, by supplying it with a chosen gas, to modify the nature of the gas of the boundary layer in said zone.
  • the eject holes for the pressurized fluid may consist of rectilinear slots or small holes, possibly aligned in one or more rows.
  • said box comprises a plurality of orifices for ejecting pressurized fluid aligned along at least one straight line parallel to the direction of advancement of said strip, at least one orifice having the form of a rectilinear slot disposed under the line median of said band.
  • said strip will be constituted by a continuous metallic strip driven by a motor member such as a drum or a pulley and passing over one or more return members.
  • the return members will be constituted by fixed curved boxes comprising one or more orifices for ejecting a gas under pressure, preferably at low temperature, creating under said strip a cushion of Coanda effect gas, which keeps it at fixed distance from said box, without direct contact with its surface.
  • the device will comprise, downstream of the impact zone of the molten metal and opposite the face opposite to the impact face, a Coanda effect box, of preferably concave, arranged in such a way that the movable strip follows, following the impact of the liquid metal, a portion of path having a curvature corresponding to a concavity of the impact face of said strip, and thus tending, by inertia effect, to keep the ribbon in intimate contact with the band.
  • a Coanda effect box of preferably concave
  • This entry slot which aims only to allow the free passage of the support strip, of well defined section and position, can be produced in the form of various devices of the known art, such as seals, airlocks or chambers intermediates, which keep the air intake inside the enclosure low.
  • the exit door is of more delicate embodiment, because it must allow not only the passage of the support strip, but also that of the ribbon manufactured inside the enclosure.
  • a gas flow occurs, coming from outside the enclosure, which tends to peel off the tape from the tape and oppose its release, and therefore its recovery.
  • tests have shown that the difficulty is overcome when the distance between the impact zone and the outlet is less than a critical value. This is generally quite low, on the order of a centimeter. and seems to correspond to the zone where the ribbon is still hot enough to adhere to the strip, its temperature being higher than the vitrification temperature of said metal or metal alloy.
  • At least one of the vacuum outlets of the enclosure is arranged in the immediate vicinity of the exit door.
  • these vacuum intakes are arranged, in identical pairs, symmetrically with respect to ! has support strip, and near its edges.
  • a structure with an exit door offset towards the inside of the enclosure preferably removable and interchangeable, so as to allow the device to be easily adapted to the chosen working conditions: dimensions and strip speed, nature of the alloy, and processing temperature, strip width, etc.
  • awnings are particularly advantageous, because it makes it possible to place the lateral vacuum sockets, located in the vicinity of the outlet and on either side of the strip, in very direct communication with the slot through which the ribbon exits. of the enclosure.
  • FIG. 1 On which we see a crucible 1, surrounded externally by a solenoid 2, making it possible to heat the metal 3 contained in the crucible to a temperature higher than the melting temperature.
  • molten metal can be ejected under pressure by a nozzle 4 in the direction of a metal strip 5, driven at high speed by means not shown below the nozzle 4. In contact with the strip 5, the molten metal undergoes hyperquenching and freezes to form a metallic ribbon 6 in the vitreous state, which adheres to the strip 5 and which is entrained by the latter.
  • a box 7, pierced with holes 8 arranged along the center line of the strip 5 (FIG. 2), is placed below this, and a gas under pressure ( air, helium, nitrogen or other), preferably at low temperature, is projected by the holes 8 in the direction of the strip 5, so as to form under this strip a gas cushion, which applies it, but without mechanical contact with it , against box 7, by Coanda effect.
  • the gas cushion guides this strip as it travels at high speed under the nozzle 4 and thus eliminates its vibrations, in particular those which come from the drive device. It also contributes to the cooling of the strip 5, in order to evacuate the calories provided by the metal. in fusion.
  • this device in the context of the invention, is particularly suitable for over-tempering carried out under reduced pressure compared to atmospheric pressure, or under any other controlled atmosphere.
  • FIG. 6 illustrates such an implementation.
  • the movable strip 16, driven by a pulley 17, passes over two return pulleys, one fixed 18, the other mounted on a tensioner 19a. It passes through an enclosure 20, the lower part of which consists of the plate of a cooled box 21, comprising orifices, supplied with pressurized fluid, forming the gas cushion with Coanda effect.
  • These orifices, arranged under the strip 16 only upstream and downstream of the grip of the enclosure 20, are not visible in the figure.
  • the enclosure 20 comprises a framework 22, laterally provided with transparent walls 23, making it possible to observe the operations.
  • the enclosure 20 comprises, for the passage of the strip 16, an inlet orifice 26a (FIG. 6), closed by a removable part 26b (FIG. 10), the lower face of which has a groove of suitable width and depth , with a slight clearance, with the dimensions of the strip 16, applies to the support box 21, and an outlet orifice 27a (FIG. 6), closed by a door 27b (FIG. 10), also mounted on the box so to let the passage of the tape and the ribbon.
  • FIG. 7 shows an embodiment of an exit door according to the invention, having a tunnel with an opening offset towards the interior of the enclosure.
  • This tunnel belongs to a removable part 28, preferably partially retractable, in the form of an angle iron having, on the one hand, a wing 28a substantially parallel to the support box 7 and resting on it by its two sides 29, and whose lower face has a profile groove adapted to the section of the strip 16 and to that of the ribbon 6 and, on the other hand, a wing 30a, arranged in the same way as the door 27b of FIG.
  • this exit door has the advantage of easily adapting to changes in working conditions, without requiring any other modification of the essential of the device, and of avoiding a blockage of the strip thanks to freedom of movement in the event of an operational incident.
  • the general shape of the removable part 30 is close to that of FIG. 7, with a wing 30b applied to the wall 22.
  • Its wing 31 does not, however, have any flanks in contact with the box 7, but takes the form of a plate, the lower face of which is flat, substantially parallel to the ribbon and located a short distance from the latter.
  • the angle of the angle iron can advantageously be slightly less than 90 °, for example of the order of 85 to 88 °.
  • the impact zones of the molten metal jet on the strip 16 have been identified by the letter I, and by the letter S the points where the ribbon 6 engages under the wings 28a and 31 of the exit doors, that is to say in fact the internal thresholds of said doors.
  • the distances IS must be less than a critical distance which depends on the working conditions.
  • the enclosure 20 is naturally equipped with vacuum sockets 32, two in number, arranged laterally with respect to the strip 16, in the case of FIGS. 7, 8, and 10. As indicated above, the orifices 32 must be arranged as close as possible to the door of the enclosure.
  • Crucibles 24 were used, pierced with an orifice with a diameter varying between 0.3 and 0.8 mm and spaced about 5 mm from the strip, and arranged in such a way that the jet of molten metal made an angle of 60 ° with it.
  • a 1.5 kW vacuum pump allows you to easily obtain an absolute pressure in the enclosure of 0.05 bar.
  • the overpressure of ejection of a molten metal through the orifice makes it possible to adjust the flow rate and was chosen for these tests in the range of 0.5 to 1 bar.
  • the devices of the invention making it possible to obtain metallic glasses, in particular with alloys of the type A x 8 1 - x where A consists of one or more transition metals (Fe, Cr, Ni, Mn, Co, etc. .), and B of one or more metalloids (P, C, Si, B, etc.), and where x, which is the atomic fraction of A, is of the order of 0.8.
  • A consists of one or more transition metals (Fe, Cr, Ni, Mn, Co, etc. .)
  • B of one or more metalloids
  • x which is the atomic fraction of A, is of the order of 0.8.

Claims (15)

1. Verfahren zur Herstellung von dünnen metallischen Bändern durch Aufspritzen eines Strahls einer Schmelze eines Metalls oder einer Metallegierung auf einer sich mit großer Geschwindigkeit bewegenden kalten Unterlage, wobei das Auftreffen des Strahls und die Bildung des Bandes auf der Unterlage in einer Atmosphäre mit einem gegenüber dem Atmosphärendruck reduzierten Druck stattfindet, dadurch gekennzeichnet, daß, bevor die Temperatur des Bands nicht die Verglasungstemperatur des Metalls oder der Metallegierung erreicht, das Band in einer Atmosphäre mit höherem Druck als der reduzierte Druck zugeführt wird.
2. Vorrichtung zur Hyperabschreckung bzw. Überhärtung eines Metalls oder einer MetaHegierung bei der Bildung eines dünnen Bandes (6) durch Aufspritzen eines Strahls einer Schmelze des Metalls oder der Metallegierung auf einer sich mit großer Geschwindigkeit unter einer Öffnung (4) zum Ausspritzen des MetalIstrahis vorbeilaufenden Unterlage, bei welcher die Öffnung (4) und der Bereich (I) der vom Strahl kontaktierten beweglichen Unterlage im Inneren eines Gehäuses (20) angeordnet sind, welches Einrichtungen (32) enthält, um die Art und den Druck der Atmosphäre in dem Gehäuse sicherzustellen, dadurch gekennzeichnet, daß die Unterlage durch ein Band (16) gebildet ist, wobei gegenüber mindestens einer der Seiten des Bandes (16) und in der Nähe des Auftreffbereichs (I) mindestens ein Kasten (7) angeordnet ist, welcher mindestens eine Ausstoßöffnung (8) für ein unter Druck stehendes Fluid, vorteilhafterweise ein gasförmiges Fluid mit geringerer Temperatur, aufweist, weiches zwischen dem Kasten (7) und dem Band (16) ein Fluidbett bildet, welches durch Coandaeffekt den Halt ohne mechanische Reibung am Kasten (7) in präziser Lage hierzu und zu einem Eintrittsschlitz (26a) sowie zu einer mit einer Innenstufe (S) für den Durchgang des Bandes (5, 16) versehenen Ausgang (27a) für jeweils den Zugang und den Austritt des Bandes vom Gehäuse (20) sicherstellt.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Kasten (7) stromauf des Auftreffbereichs (I) der Metallschmelze auf das Band (5, 16) sowie bezüglich der Auftrefffläche angeordnet ist, und daß das Fluid ein Gas ist.
4. Vorrichtung nach einem der Ansprüche 2 und 3, dadurch gekennzeichnet, daß der Kasten (7) eine Anzahl von Öffnungen (8, 10, 12, 14) für den Ausstoß des unter Druck stehenden Fluids aufweist, die längs mindestens einer Geraden parallel zur Vorschubrichtung des Bandes ausgerichtet sind, wobei mindestens eine Öffnung die Form eines geradlinigen Schlitzes aufweist, welcher unter der Mittellinie des Bandes angeordnet ist.
5. Vorrichtung nach einem der Ansprüche 2 bis 4, bei welcher das Band (5, 16) durch ein kontinuierlich durch einen Motor (7) angetriebenes Metailband auf einem Vorgelege (18, 19) gebildet ist, dadurch gekennzeichnet, daß mindestens eines der Glieder des Vorgeleges durch einen festen gekrümmten Kasten (33) gebildet ist, welcher eine oder mehrere Öffnungen (34) für den Ausstoß eines Fluids aufweist, und zwar vorteilhafterweise eines gasförmigen, unter Druck stehenden Fluids mit vorzugsweise geringerer Temperatur, um zwischen dem Kasten (33) und dem Band (5, 16) ein Fluidbett zu bilden, welches das Band (5, 16) ohne Reibung am Kasten in seiner Lage hält.
6. Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Vorrichtung stromabwärts des Auftreffbereichs und auf der der Auftrefffläche gegenüberliegenden Fläche einen konkaven Kasten zur Bildung eines Coandaeffekts (7, 33) aufweist, welcher derart angeordnet ist, daß das bewegliche Band hinter dem Auftreffbereich (I) des flüssigen Metalls einem Streckenabschnitt folgt, welcher eine Krümmung entsprechend einer Konkavität der Auftrefffläche des Bandes (5, 16) entspricht.
7. Vorrichtung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß die Einrichtungen zur Sicherstellung der Atmosphäre mindestens eine Abnahmeöffnung (32) aufweist, welche in unmittelbarer Nähe des Ausgangs (27a) des Gehäuses (20) angeordnet ist.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Vorrichtung zwei seitlich und beidseits des Bands (16) sowie im wesentlichen in Bandebene angeordnete Abnahmeöffnungen (32) aufweist.
9. Vorrichtung nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, daß die Vorrichtung wenigstens zwei Kästen für die Erzeugung eines Coandaeffekts aufweist, von denen einer stromaufwärts und der andere stromabwärts des Gehäuses (20) in unmittelbarer Nähe des Eintrittsschlitzes (26a) und des Ausgangs (27a) angeordnet ist.
10. Vorrichtung nach einem der Ansprüche 2 bis 9, dadurch gekennzeichnet, daß das Gehäuse (20) als untere Wand die Platte eines gekühlten Stützglieds (21) aufweist, dessen Enden außerhalb des Gehäuses die Kästen zur Erzeugung des Coandaeffekts für das Band (16) in Nachbarschaft des Auftreffbereichs (I) bilden.
11. Vorrichtung nach einem der Ansprüche 2 bis 10, dadurch gekennzeichnet, daß die Vorrichtung im Gehäuse (20) oberhalb des durch das Stützband (16) aufgenommenen Bands (6) ein vorzugsweise teilweise einziehbares Teil (28, 30) aufweist, welches eine zum Band im wesentlichen parallele Fläche aufweist und das Band von einer unmittelbar dem Auftreffbereich (I) benachbarten Stelle bis außerhalb des Gehäuses überdeckt, wobei die Fläche des Teils (28, 30) gegenüber dem Band (6) und dem Stützband (16) ein ausreichendes Durchgangsspiel aufweist.
12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die das Band (6) bedeckende untere Fläche des Teils (28, 30) mit dem Band einen Winkel zwischen 0 und 5° bildet, wobei die Öffnung des Winkels gegen den Strahl der Metallschmelze gerichtet ist.
13. Vorrichtung nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß das das Band bedeckende Auslaßteil (28, 30) unter Gewährleistung eines Spiels in vertikaler Richtung beweglich ist.
14. Vorrichtung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß die Achse des Strahls der Schmelze gegenüber dem Stützband schräg verläuft und mit diesem einen spitzen, in Richtung stromaufwärts offenen Winkel bildet.
15. Vorrichtung zur schroffen Abkühlung eines Schmelzmaterials bei der Bildung eines dünnen Bands (6), mit einem mit großer Geschwindigkeit unter einer ein Metall oder eine Metallegierung im Schmelzzustand unter Druck ausstoßenden Öffnung (4) vorbeilaufenden Stützband, dadurch gekennzeichnet, daß bezüglich mindestens einer der Seiten des Stützbands (5, 16) und benachbart des Auftreffbereichs (I) der Schmelze aus Metall oder Metallegierung auf das Stützband (5, 16) mindestens ein Kasten (7) angeordnet ist, der mindestens eine Ausstoßöffnung (8) für ein vorzugsweise gasartiges, unter Druck stehendes und vorzugsweise eine geringe Temperatur aufweisendes Fluid aufweist, wobei zwischen dem Kasten (7) und dem Stützband (5, 16) ein Fluidbett geschaffen wird, welches aufgrund eines Coandaeffekts den Halt ohne mechanische Reibung am Kasten und in präziser Lage hierzu gewährleistet.
EP81401145A 1980-07-18 1981-07-20 Verfahren und Vorrichtungen zur Herstellung dünner, gehärteter Bänder durch kontinuierliches Giessen Expired EP0044786B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8015918 1980-07-18
FR8015918A FR2486838A1 (fr) 1980-07-18 1980-07-18 Procede et dispositif de fabrication de rubans minces trempes par coulee sur un substrat defilant en continu et produits obtenus

Publications (2)

Publication Number Publication Date
EP0044786A1 EP0044786A1 (de) 1982-01-27
EP0044786B1 true EP0044786B1 (de) 1985-07-17

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EP81401145A Expired EP0044786B1 (de) 1980-07-18 1981-07-20 Verfahren und Vorrichtungen zur Herstellung dünner, gehärteter Bänder durch kontinuierliches Giessen

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US (2) US4520859A (de)
EP (1) EP0044786B1 (de)
JP (1) JPS5750253A (de)
BR (1) BR8104611A (de)
CA (1) CA1202552A (de)
DE (1) DE3171388D1 (de)
ES (1) ES8205365A1 (de)
FR (1) FR2486838A1 (de)
IE (1) IE51415B1 (de)
ZA (1) ZA814781B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH671534A5 (de) * 1986-03-14 1989-09-15 Escher Wyss Ag
FR2784095B1 (fr) * 1998-10-06 2001-09-21 Dowell Schlumberger Services Compositions de cimentation et application de ces compositions pour la cimentation des puits petroliers ou analogues
US6527043B2 (en) * 2001-05-01 2003-03-04 Antaya Technologies Corporation Apparatus for casting solder on a moving strip

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Publication number Priority date Publication date Assignee Title
US2886866A (en) * 1956-12-12 1959-05-19 Marvalaud Inc Apparatus and method for producing metal fibers and filaments
US3344845A (en) * 1965-08-16 1967-10-03 Aluminum Co Of America Horizontal continuous casting apparatus
FR1527937A (fr) * 1967-03-31 1968-06-07 Saint Gobain Dispositif de transport d'un matériau en forme de feuille sur un coussin gazeux
US3862658A (en) * 1973-05-16 1975-01-28 Allied Chem Extended retention of melt spun ribbon on quenching wheel
DK142345B (da) * 1974-09-11 1980-10-20 Dansk Ind Syndikat Anlæg til fremstilling af støbegods i successivt fremstillede og trinvis fremførte støbeforme bestående af ens formparter.
CH613884A5 (de) * 1976-04-13 1979-10-31 Escher Wyss Ag
US4077462A (en) * 1976-06-30 1978-03-07 Allied Chemical Corporation Chill roll casting of continuous filament
AT361506B (de) * 1976-07-20 1981-03-10 Projektierung Chem Verfahrenst Verfahren zur gewinnung von xylan und faser- stoffen aus xylanhaltigen pflanzlichen roh- stoffen
US4142571A (en) * 1976-10-22 1979-03-06 Allied Chemical Corporation Continuous casting method for metallic strips
CH624322A5 (en) * 1977-03-04 1981-07-31 Larex Ag Device for cooling and guiding a revolving mould belt in a continuous casting installation
JPS5474698A (en) * 1977-11-28 1979-06-14 Univ Tohoku Superconductive thin band and method of fabricating same
DE2926181C2 (de) * 1978-06-29 1986-02-13 Hitachi, Ltd., Tokio/Tokyo Vorrichtung zum Stranggießen
US4193440A (en) * 1978-09-01 1980-03-18 Alcan Research And Development Limited Belt-cooling and guiding means for the continuous belt casting of metal strip

Also Published As

Publication number Publication date
ZA814781B (en) 1982-07-28
IE51415B1 (en) 1986-12-24
EP0044786A1 (de) 1982-01-27
ES504058A0 (es) 1982-06-16
FR2486838A1 (fr) 1982-01-22
JPH0435258B2 (de) 1992-06-10
FR2486838B1 (de) 1983-12-23
IE811618L (en) 1982-01-18
CA1202552A (fr) 1986-04-01
DE3171388D1 (en) 1985-08-22
BR8104611A (pt) 1982-04-06
ES8205365A1 (es) 1982-06-16
US4520859A (en) 1985-06-04
JPS5750253A (en) 1982-03-24
US4562877A (en) 1986-01-07

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