EP0040073B1 - Dispositif pour couler une bande - Google Patents

Dispositif pour couler une bande Download PDF

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Publication number
EP0040073B1
EP0040073B1 EP81302063A EP81302063A EP0040073B1 EP 0040073 B1 EP0040073 B1 EP 0040073B1 EP 81302063 A EP81302063 A EP 81302063A EP 81302063 A EP81302063 A EP 81302063A EP 0040073 B1 EP0040073 B1 EP 0040073B1
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EP
European Patent Office
Prior art keywords
slot
casting
nozzle
strip
lip
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
EP81302063A
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German (de)
English (en)
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EP0040073A1 (fr
Inventor
Stuart Leslie Ames
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.)
Allegheny Ludlum Steel Corp
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Allegheny Ludlum Steel Corp
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Publication of EP0040073A1 publication Critical patent/EP0040073A1/fr
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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
    • 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
    • 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
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles

Definitions

  • the present invention relates to the casting of strip material at high quench rates and at high production rates. More particularly, the present invention is directed to apparatus for rapidly casting thin metallic strip material.
  • United States Patent No. 4,142,571 is particularly directed to a slot construction in a metal strip casting nozzle having stringent dimensional requirements.
  • United States Patent No. 4,077,462 pertains to the provision of a specific construction for a stationary housing above the peripheral surface of a chill roll used for strip casting.
  • melt spinning processes of producing metallic filament by cooling a fine molten stream either in free flight or against a chill block have been practised.
  • melt extraction techniques such as crucible melt extraction disclosed in United States Patent No. 3,838,185 and pendant drop melt extraction techniques taught in United States Patent No. 3,896,203. It has been found difficult to produce uniform sheet or strip by such alternative techniques of rapid casting. There are many factors, such as casting temperature and pressure, auxiliary surface cooling rates, surface coatings for the casting surface, and the like which appear to affect the product thickness and the quality of rapidly cast strip material.
  • strip casting is not a widely accepted and commercially significant operation at the present time. It appears that various improvements, modifications and innovations are required in the art to effect a significant commercial impact in the art of strip casting.
  • proper relationships among such variables as molten metal tundish construction, nozzle orifice size and dimensions, spacing from a casting surface, speed at which such surface is moved, quench rates, metal temperature and feed rates, and the like may require more accurate identification and interrelation in order to accomplish the uniformity and consistency required for successful, commercial production of cast strip.
  • certain nozzle and slot structures and their dimensional relationship to the casting surface onto which strip material is cast have been found to be desirable to yield uniform strip casting results when utilized in various casting parameters.
  • a strip casting apparatus which is capable of continuously casting metallic strip material of substantially uniform dimension and substantially uniform quality throughout its length.
  • Another object of the present invention is the provision of a strip casting apparatus having an outwardly diverging nozzle construction which promotes the efficient rapid casting of metal strip material.
  • Another object of the present invention is to provide a strip casting apparatus capable of reproducing successful strip casting operations.
  • Another object of this invention is to provide a strip casting apparatus which can effect sufficiently rapid quenching of the produced strip to result in the production of amorphous strip.
  • the production of continuously cast crystalline material is also comprehended by the present invention.
  • a further object of this invention is to identify certain design and dimensional requirements, particularly with regard to an outwardly diverging nozzle structure, which permits continuous and repetitious rapid casting of metallic strip material of uniform dimension and uniform quality.
  • the above-mentioned United States Patent No. 4,142,571 discloses continuously casting metal strip comprising a tundish for receiving and holding molten metal, a nozzle comprising a slot disposed in the tundish with the longitudinal extent of the slot approximating the width of the strip to be cast, said slot having substantially uniform cross-sectional dimensions throughout the longitudinal extent thereof, and a cooled casting surface at least as wide as the strip to be cast disposed outside the nozzle and movable past the nozzle, at a standoff distance not more than 1 mm therefrom, in a direction substantially perpendicular to the longitudinal axis of the slot, and the slot having an outer portion near the casting surface and an inner portion remote from the casting surface.
  • said slot is defined between a first lip and a second lip of the nozzle, said first lip and said second lip having substantially planar inside surfaces, facing one another at said inner portion of the slot, said inside surfaces diverging from one another at the outer portion of the slot, and said first lip and said second lip having bottom surfaces facing the casting surface at a standoff distance less than 3.048 mm (0.120 inch).
  • Figure 1 generally illustrates an apparatus for casting metallic strip material 10 in accordance with the present invention.
  • This apparatus includes an element upon which the strip 10 is cast.
  • a continuous strip 10 is cast onto a smooth, outer peripheral surface 14 of a circular drum or wheel 12 as shown in Figure 1.
  • a wheel with a smooth, frustoconical outer peripheral surface may be employed.
  • a belt capable of rotating through a generally ovular path may also be employed as the casting element.
  • the cooled casting surface should be at least as wide as the strip to be cast.
  • the casting element comprises a water cooled, precipitation hardened copper alloy wheel 12 containing about 98% copper and about 2% chromium.
  • Copper and copper alloys are chosen for their high thermal conductivity and wear resistance.
  • beryllium copper alloys, steel, brass, aluminum, aluminum alloys or other materials may be utilized alone, or in combination.
  • multipiece wheels having sleeves of molybdenum or other material may be employed.
  • cooling may be accomplished with the use of a medium other than water. Water is typically chosen for its low cost and its ready availability.
  • the surface 14 of the casting wheel 12 must be able to absorb the heat generated by contact with molten metal at the initial casting location 16, and such heat must be conducted substantially into the copper wheel during each rotation of the wheel.
  • the initial casting point 16 refers to the approximate location on the casting surface 14 where molten metal 20 from a tundish 22 first contacts the casting surface 14.
  • Cooling, by heat conduction, may be accomplished by delivering a sufficient quantity of water through internal passageways located near the periphery of the casting wheel 12. Alternatively, the cooling medium may be delivered directly to the underside of the casting surface. Understandably, refrigeration techniques and the like may be employed to accelerate or decelerate cooling rates, and/or to effect wheel expansion or contraction during strip casting.
  • the casting surface should be generally smooth and symmetrical to maximize uniformity in strip casting.
  • the distance between the outer peripheral casting surface 14 and the surfaces defining the orifice of the nozzle which is feeding the molten material onto the casting surface 14 must not deviate from a desired or set distance during the casting operation. This distance shall hereinafter be called standoff distance or gap. It is understandable that the gap should be substantially maintained throughout the casting operation when it is the intention to cast uniform strip material.
  • the casting element is a drum or a wheel
  • the element should be carefully constructed so as not to be out-of-round during operation to ensure uniformity in strip casting.
  • a drum or wheel which is out-of-round by about 0.508 mm (0.020 inch), or more may have a magnitude of dimensional instability which unless corrected or compensated during operation, may be unacceptable for certain strip casting operations.
  • acceptable dimensional symmetry, as well as the elimination of problems associated with weld porosity may be more readily accomplished by fabricating the wheel or drum from a single, integral slab of cold rolled or forged copper alloy.
  • alternative materials, including sleeves and coatings may be employed.
  • the molten material 20 to be cast in the apparatus described herein is preferably retained in the crucible or tundish 22, which is provided with a pouring orifice or nozzle 24.
  • the nozzle 24 is typically, though not necessarily, located at a lower portion of the tundish 22 as shown in Figure 1.
  • the nozzle 24 may be a separate element in the tundish 22 or, the nozzle 24 and tundish 22 may be monolithic, i.e. integrally formed, with all or any portion of the tundish 22.
  • the nozzle 24, located in or forming a lower portion of the tundish 22 may comprise a slotted element, as best shown in Figure 2.
  • the slot 30 is preferably substantially centrally located in the nozzle element. Such approximate central location of the slot 30 helps to assure uniformity as the pressure of the molten metal bearing thereagainst is substantially equalized during the casting operation. It should be understood, however, that the slot 30 may be located in off-centre positions as may be desired.
  • the longitudinal extent of the slot 30 should approximate the width of the strip to be cast. There does not appear to be a limitation on the longitudinal extent of the slot, and slots as long as 914 mm (thirty six inches), or longer, are comprehended by the present invention. It is highly desirable that the molten metal flow uniformly through the slot 30 in the nozzle 24 of the present invention in order to produce uniform, high quality strip material. In an alternative embodiment, strip of various widths may be simultaneously produced by cutting multiple longitudinally aligned slots 30 of appropriate longitudinal extent in the nozzle area of the tundish 22, as opposed to a single slot 30. Regardless of the size of the slot 30, or slots, the cross-sectional dimensions of each slot 30 should be substantially uniform throughout the longitudinal extent thereof to produce strip material having uniform dimensions. In the operation of the strip casting apparatus of the present invention, the cooled casting surface 14 moves past the slot 30 in a direction substantially perpendicular to the longitudinal axis of the slot.
  • the slot 30 is defined between a first lip 32 and a second lip 34 of the nozzle 24.
  • the first lip 32 is located at the downstream edge of the slot 30, with respect to the direction of movement of the casting surface 14 indicated by the arrow in Figure 2.
  • the second lip 34 is located at an upstream edge of the slot with respect to the casting direction.
  • the first lip 32 and the second lip 34 have inside surfaces 36 and 38, respectively, which are substantially parallel to and facing one another at least at an inner portion of the slot 30.
  • the inner portion refers to that portion which is remote from the casting surface 14, i.e., which is near the molten metal holding portion of the tundish while an outer portion of the slot 30 refers to that portion near the casting surface 14.
  • the innermost portion of the slot may be relieved or tapered.
  • the innermost portion of the first lip 32 and/or the second lip 34 may be cut into a general V-shape, or a more rounded U-shape creating an initial funnel type structure for the slot as illustrated in Figures 3 and 5.
  • Such relief of the innermost portion of the slot 30 may assist in maintaining uniform molten metal flow patterns and minimizing irregularities or turbulence during strip casting.
  • What is required by the present invention is that the inside surfaces 36 and 38 are facing and parallel at least at some inner portion of the slot 30.
  • outwardly diverging surfaces are indicated by reference numerals 40 and 42 in Figure 2.
  • Such outward divergence of the inside surfaces may be accomplished by alternative structures such as those shown in Figures 3, 4 and 5. It should be noted that only one of the inside surfaces needs to diverge to create the necessary relationship of outward divergence therebetween as shown in Figures 3 and 4. Also, curved surfaces, radiused either inwardly 40 or outwardly 42 as shown in Figure 5, may establish such outward divergence.
  • the first and second lips 32 and 34 extend to bottom surfaces 44 and 46 respectively.
  • Such bottom surfaces 44 and 46 of the lips 32 and 34 face the casting surface 14, and are located at a standoff distance, or gap, of less than 3.048 mm (0.120 inch) from the casting surface.
  • the standoff distance e between the bottom surface 44 of the first lip 32 and the casting surface 14 is as small as possible consistent with permitting the casting surface 14 to move thereunder in an unobstructed path.
  • the gap e between the bottom surface 44 of the first lip 32 and the casting surface 14 must be small enough at the nozzle orifice to prevent significant molten metal backflow therebetween during casting.
  • the gap d between the casting surface 14 and the bottom surface 46 of the second lip 34 is preferably less than 2.032 mm (0.080 inch), and for casting certain alloys into thin gauge strip may be less than 0.254 mm (0.010 inch).
  • the bottom surfaces 44 and 46 are in substantially complete parallelism with the casting surface 14, at least at the nozzle orifice.
  • such parallelism may be accomplished by placing a sheet of sandpaper, or the like, against the casting surface 14 with the grit side of the sandpaper facing the nozzle 24.
  • the bottom surface 44 and 46 are ground by the grit into substantially complete parallelism with the casting surface 14.
  • Such parallelism may be achieved even when round or other curvilinear casting surfaces are employed. To achieve such parallelism on most refractory nozzles by this procedure, 400 to 600 grit sandpaper has been found to be adequate.
  • the corners between the surfaces defining the slot 30 may be radiused to minimize molten metal turbulence during casting.
  • sharp corners may be subjected to various pressure and flow patterns which could create stress conditions for nozzles 24 made of certain materials, and in some instances, may cause the nozzle to break, crack or wear during casting in a manner which may upset balanced strip casting conditions. Providing such rounded corners may minimize the adverse affects of such turbulence and flow through the nozzle 24.
  • the crucible 22 is preferably constructed of a material having superior insulating ability. If the insulating ability is not sufficient to retain the molten material at a relatively constant temperature, auxiliary heaters such as induction coils may have to be provided in and/or around the crucible 22, or resistance elements such as wires may be provided.
  • a convenient material for the crucible is an insulating board made from fiberized kaolin, a naturally occurring, high purity, alumina-silica fire clay. Such insulating material is available under the trade name Kao- wool HS board.
  • various other materials may have to be employed for constructing the crucible or the nozzle including graphite, alumina graphite, quartz, clay graphite, boron nitride, silicon nitride, silicon carbide, boron carbide, alumina, zirconia and various combinations or mixtures of such materials. It should be understood that these materials may be strengthened; for example, fiberized kaolin may be strengthened by impregnating with a silica gel or the like.
  • lips 32 and 34 forming the orifice of the nozzle 24 may be constructed of a material which is better able to maintain dimensional stability and integrity during exposure to high molten metal temperatures for prolonged time periods. Such materials may take the form of a single, generally semi-circular element with a slot 30 cut therethrough or a pair of inserts held in the crucible to form a slot 30 therebetween.
  • the slot or slots in single elements may be cut ultrasonically to ensure that the desired slot dimensions are accurately provided.
  • nozzles 24 may be constructed of materials such as quartz, graphite, clay graphite, boron nitride, alumina graphite, silicon carbide, stabilized zirconia silicate, zirconia, magnesia, alumina or other similar molten metal resistant material.
  • Such nozzles 24 may be held in the orifice of the crucible mechanically, with pressure, and/or with the aid of adhesives such as various refractory cements, spring biased mechanisms, or the like.
  • the drive system and housing for the drum, wheel or other casting surface 14 of the present invention should be rigidly constructed to permit drum rotation without structural instability which could cause the drum to slip or vibrate. In particular, care should be taken to avoid resonant frequencies at the operating speeds for the casting surface 14.
  • the casting surface 14 should be capable of moving at a surface speed of from 61 metres (200 linear surface feet) per minute to more than 3048 metres (10,000 linear surface feet) per minute, preferably 548 to 1219 metres (1800 to 4000 feet) per minute, when utilizing a drum having a circumference of about 2.4 metres (8 feet), this rate calculates to a drum speed from about 25 rpm to about 1250 rpm.
  • a three horsepower variable speed reversible, dynamically braked motor provides an adequate drive system for an integral copper alloy casting drum approximately 50.8 mm (2 inches) thick and about 2.4 metres (8 feet) in circumference.
  • the casting surface 14 on the wheel or drum of the apparatus of the present invention is smooth. It has been found that in certain applications, such as for producing amorphous materials, finishing the peripheral surface 14 of a casting drum 12 with 400-grit paper and preferably with 600-grit paper may yield improved product uniformity.
  • the nozzle 24 is defined by an insert made of clay graphite, a molten metal resistant material, held in the walls of the crucible 22.
  • the slot 30 is cut ultrasonically in the clay graphite nozzle 24.
  • the first lip 32 and the second lip 34 of the nozzle 24 define the slot 30 therebetween.
  • a plate made of quartz or vycor material or an insert of boron nitride may be employed.
  • the desired slot forming the orifice 46 may be accurately cut therein with an ultrasonic drill.
  • a preferred one piece element forming a nozzle, as best illustrated in Figure 2 may be constructed of a semi-circular ring of molten metal resistant material.
  • a slot having a width of about 0.254 to about 2.032 mm (about 0.010 to about 0.080 inch) between the facing, parallel inside surfaces 36 and 38 may be ultrasonically drilled into a clay graphite insert material, and the insert held in the crucible 22. It should be understood that the design of the insert may be modified to assist in holding the insert forming the nozzle 24 in the crucible 22.
  • a preferred nozzle 24 of the apparatus of the present invention is shown in enlarged cross-section in Figure 2.
  • the dimensions indicated in Figure 2 have the following preferred limitations.
  • the width of the slot f is typically in the range of from about 0.254 to 1.016 mm (0.010 to 0.040 inch). In the production of crystalline strip material, such as stainless steel, the width of the slot f may be greater, perhaps as high as about 2.032 mm (0.080 inch) if thick strip is being uniformly produced in accordance with the present invention. Also, the primary purpose of a relief at an inner portion of the slot 30, such as is shown in Figures 3 and 5 is to eliminate clogging of molten metal in the orifice passage during strip casting.
  • molten metal is delivered to a heated crucible 22.
  • a heater such as induction coils of resistance wire, may be provided in and above the crucible 22 to maintain relatively constant molten metal temperatures as may be desired.
  • the molten metal may be poured directly into a preheated crucible.
  • the preheat temperature should prevent freezing or clogging of the slot 30 during the initial casting operation, and the temperature of the flowing metal should thereafter keep the crucible 22 and nozzle 24 at sufficient temperature to ensure uninterrupted molten metal flow through the orifice.
  • the nozzle itself may be externally heated throughout the casting operation.
  • the metal which is fed to the crucible 22 may be superheated to allow a certain degree of temperature loss without adversely affecting the metal flow through the nozzle 24.
  • a metallostatic head height in the tundish 22 is preferably maintained at a relatively constant level, typically at a level of less than 254 mm (ten inches) above the nozzle 24, throughout the casting operation to assure that a relatively constant static head pressure may be maintained at the nozzle 24.
  • This may be accomplished by initially pouring the molten metal into the crucible to the desired height and thereafter controlling the rate at which additional molten metal is poured into the crucible to maintain the metallostatic head. It is understandable that the rate at which additional molten metal is fed to the crucible 22 should be in substantial conformity with the rate at which metal flows from the nozzle orifice onto the casting surface 14 in forming strip material.
  • the nozzle 24 of the present invention is characterized by outwardly diverging lip surfaces 40 and 42 at the outer portion of the slot 30.
  • Such structure facilitates increased molten metal flow to a moving casting surface 14, resulting in improved lateral flow of molten metal onto a casting surface 14, and in the formation of high quality strip material 10.
  • the width b of the orifice of the slot 30 at the outermost divergent portion may be as wide as about 5.08 mm (.200 inch), which may be in excess of about four times the width f of the slot 30 as measured between the inner, parallel facing surfaces of the slot 30.
  • Such structure provides a relatively large casting cavity at the outer portion of the nozzle 24, fed by a relatively narrow internal orifice.
  • Various alloys may be successfully cast using the apparatus of the present invention, including certain brazing alloys, including nickel based brazing alloys, stainless steel and certain silicon steel grades.
  • the cast alloy has been shown to be amorphous, and in other applications, the cast strip material has been shown to be crystalline.
  • doctor blade has been found particularly useful in the production of thinner amorphous strip materials which appear to have a greater tendency to adhere to the casting surface 14 than do the crystalline strip materials. It is believed that the force which retains the strip on the casting surface may reflect the quality of the thermal contact between the strip and the casting surface.
  • the casting of relatively high quality strip material including amorphous material which for the purposes of this invention includes materials which are at least 25% amorphous, is feasible and practical using the apparatus and procedures described above. Understandably, the quench rates must be higher for amorphous material as compared to crystalline material. Quench rates may be accelerated such as by increasing the speed of the casting surface, or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Claims (13)

1. Appareil de coulée continue d'une bande métallique comprenant:
un panier de coulée (22) destiné à recevoir et contenir un métal fondu (20),
une buse (24) comprenant une fente (30) disposée dans le panier de coulée, la longueur de la fente étant à peu près égale à la largeur de la bande (10) à couler, la fente ayant une section de dimension sensiblement uniforme sur toute sa longueur, et
une surface refroidie de coulée (14) ayant une largeur au moins égale à celle de la bande à couler, disposée à l'extérieur de la buse (24) et mobile devant la buse à une distance de maintien de celle-ci, en direction sensiblement perpendiculaire à l'axe longitudinal de la fente (30), la fente ayant une partie externe proche de la surface de coulée (14) et une partie interne distante de la surface de coulée,
caractérisé en ce que la fente (30) est délimitée entre une première lèvre (32) et une seconde lèvre (34) de la buse (24),
la première lèvre et la seconde lèvre ayant des surfaces internes sensiblement planes (36, 38) tournées l'une vers l'autre dans la partie interne de la fente, les surfaces internes divergeant l'une par rapport à l'autre (en 40, 42) dans la partie externe de la fente, et
la première lèvre (32) et la seconde lèvre (34) ayant des surfaces inférieures (44, 46) tournées vers la surface de coulée (14) à une distance de maintien inférieure à 3,048 mm.
2. Appareil selon la revendication 1, dans lequel les surfaces internes en regard (36, 38) de la première et de la seconde lèvre (32, 34) sont parallèles l'une à l'autre au moins dans la partie interne de la fente (30).
3. Appareil selon la revendication 2, dans lequel la surface inférieure (44) de la première lèvre (32) est disposée vers la surface de coulée (14) sur une longueur au moins égale au double de la largeur de la fente (30) mesurée entre les surfaces parallèles en regard (36, 38).
4. Appareil selon l'une des revendications 2 et 3, dans lequel l'espace compris entre les surfaces internes parallèles en regard (36, 38) de la première et de la seconde lèvre (32, 34) est compris entre 0,254 et 1,016 mm.
5. Appareil selon l'une quelconque des revendications 2 à 4, dans lequel l'espace compris entre les surfaces internes (40, 42) de la première et de la lèvre (32, 34) dans la partie externe de la fente (30) est supérieur d'au moins 0,254 mm à l'espace compris entre les surfaces internes parallèles en regard (36, 38) de la première et de la seconde lèvre.
6. Appareil selon l'une quelconque des revendications précédentes, dans lequel l'espace compris entre les surfaces internes (40, 42) de la première et de la seconde lèvre (32, 34) dans la partie divergente externe de la fente (30) est compris entre 1,016 et 4,572 mm.
7. Appareil selon l'une quelconque des revendications précédentes, dans lequel l'espace compris entre les surfaces internes (40, 42) de la première et de la seconde lèvre (32, 34) dans la partie externe divergente externe de la fente (30) est compris entre 2,54 et 3,81 mm.
8. Appareil selon l'une quelconque des revendications précédentes, dans lequel la surface de coulée (14) est mobile en face de la buse (24) à une vitesse comprise entre 61 et 3048 m/min.
9. Appareil selon la revendication 8, dans lequel la surface de coulée (14) est mobile devant la buse (24) à une vitesse comprise entre 548 et 1219 m/min.
10. Appareil selon l'une quelconque des revendications précédentes, dans lequel la surface de coulée (14) est la surface périphérique d'une roue (12) refroidie par de l'eau.
11. Appareil selon la revendication 10, dans lequel la roue (12) est formée d'un métal choisi parmi le cuivre, l'alliage de cuivre, l'aluminium, l'alliage d'aluminium, l'acier, le molybdène et leurs combinaisons.
12. Appareil selon l'une quelconque des revendications précédentes, dans lequel la buse (24) est construite à partir d'un matériau choisi parmi le graphite, le graphite-alumine, le graphite-argile, le quartz, le kaolin fibré, le nitrure de bore, le nitrure de silicium, le carbure de silicium, le carbure de bore, l'alumine, la zircone, la zircone stabilisée, le silicate, la magnésie et leurs combinaisons.
13. Appareil selon l'une quelconque des revendications précédentes, dans lequel une partie au moins des surfaces inférieures (44, 46) de la première et de la seconde lèvre (32, 34) sont parfaitement parallèles à la surface de coulée (14).
EP81302063A 1980-05-09 1981-05-08 Dispositif pour couler une bande Expired EP0040073B1 (fr)

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Application Number Priority Date Filing Date Title
US14844180A 1980-05-09 1980-05-09
US148441 1980-05-09

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EP0040073A1 EP0040073A1 (fr) 1981-11-18
EP0040073B1 true EP0040073B1 (fr) 1984-05-02

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EP (1) EP0040073B1 (fr)
JP (1) JPS574359A (fr)
KR (1) KR830005930A (fr)
AR (1) AR227668A1 (fr)
AT (1) ATA206281A (fr)
AU (1) AU6997681A (fr)
BR (1) BR8102820A (fr)
CA (1) CA1194269A (fr)
DE (1) DE3163362D1 (fr)
ES (1) ES502052A0 (fr)
GB (1) GB2214679B (fr)
HU (1) HU183418B (fr)
MX (1) MX154957A (fr)
NO (1) NO156818C (fr)
PL (1) PL231046A1 (fr)

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US4330025A (en) * 1980-09-11 1982-05-18 Allegheny Ludlum Steel Corporation Nozzle in a strip casting apparatus
WO1984003852A1 (fr) * 1983-03-28 1984-10-11 Tdk Corp Dispositif et procede de production d'une bande metallique mince
AU578968B2 (en) * 1984-09-13 1988-11-10 Allegheny Ludlum Steel Corp. Method and apparatus for direct casting of crystalline strip by radiantly cooling
US4715428A (en) * 1984-09-13 1987-12-29 Allegheny Ludlum Corporation Method and apparatus for direct casting of crystalline strip by radiant cooling
US5063988A (en) * 1990-06-22 1991-11-12 Armco Inc. Method and apparatus for strip casting
GB2290897B (en) * 1994-06-28 1998-07-01 Lee Ming Cheng Magnetic cards
GB2294790B (en) * 1994-09-02 1998-02-18 Andrew David Lewis Article characterisation method and apparatus
US5842511A (en) * 1996-08-19 1998-12-01 Alliedsignal Inc. Casting wheel having equiaxed fine grain quench surface
JP4517386B2 (ja) * 2004-06-30 2010-08-04 住友電気工業株式会社 鋳造用ノズル

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CH581359A5 (fr) * 1974-10-01 1976-10-29 Grey Lab Establishment
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GB1541579A (en) * 1976-10-16 1979-03-07 Emi Ltd Security material and examination theroef
US4142571A (en) * 1976-10-22 1979-03-06 Allied Chemical Corporation Continuous casting method for metallic strips
US4257830A (en) * 1977-12-30 1981-03-24 Noboru Tsuya Method of manufacturing a thin ribbon of magnetic material
GB2021835B (en) * 1978-05-30 1982-08-04 Emi Ltd Making and examining security documents
DE3000560C2 (de) * 1980-01-09 1986-10-09 Hermann 7742 St Georgen Stockburger Verfahren zur Echtheitsprüfung eines Datenträgers und Vorrichtung zur Durchführung des Verfahrens
IT1159459B (it) * 1983-06-14 1987-02-25 Urmet Spa Sistema di registrazione e lettura di schede magnetiche valorizzate particolarmente per telefonia pubblica
US4626669A (en) * 1983-12-28 1986-12-02 Fairview Partners Intercept system for intercepting stolen, lost and fraudulent cards

Also Published As

Publication number Publication date
JPH0341258B2 (fr) 1991-06-21
HU183418B (en) 1984-05-28
CA1194269A (fr) 1985-10-01
PL231046A1 (fr) 1982-01-04
GB8900646D0 (en) 1989-03-08
EP0040073A1 (fr) 1981-11-18
AU6997681A (en) 1981-11-12
NO156818B (no) 1987-08-24
NO156818C (no) 1987-12-02
DE3163362D1 (en) 1984-06-07
KR830005930A (ko) 1983-09-14
JPS574359A (en) 1982-01-09
BR8102820A (pt) 1982-02-02
ES8307138A1 (es) 1983-06-16
ES502052A0 (es) 1983-06-16
NO811578L (no) 1981-11-10
ATA206281A (de) 1986-07-15
AR227668A1 (es) 1982-11-30
MX154957A (es) 1988-01-14
GB2214679A (en) 1989-09-06
GB2214679B (en) 1992-07-22

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