EP0045365B1 - Dispositif pour introduire le métal fondu dans un moule de coulée continu dont les parois sont mobiles - Google Patents

Dispositif pour introduire le métal fondu dans un moule de coulée continu dont les parois sont mobiles Download PDF

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Publication number
EP0045365B1
EP0045365B1 EP81104544A EP81104544A EP0045365B1 EP 0045365 B1 EP0045365 B1 EP 0045365B1 EP 81104544 A EP81104544 A EP 81104544A EP 81104544 A EP81104544 A EP 81104544A EP 0045365 B1 EP0045365 B1 EP 0045365B1
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EP
European Patent Office
Prior art keywords
gap
pouring body
walls
guide rails
mould
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
EP81104544A
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German (de)
English (en)
Other versions
EP0045365A1 (fr
Inventor
Dieter Dipl.-Ing. Figge
Jürgen Dr.-Ing. Hartwig
Dieter Dr.-Ing. Neuschütz
Jürgen Dr.-Ing. Pötschke
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.)
Fried Krupp AG
Original Assignee
Fried Krupp AG
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Publication date
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Priority to AT81104544T priority Critical patent/ATE6215T1/de
Publication of EP0045365A1 publication Critical patent/EP0045365A1/fr
Application granted granted Critical
Publication of EP0045365B1 publication Critical patent/EP0045365B1/fr
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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
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal

Definitions

  • the invention relates to a metal inlet in continuous casting devices, according to the preamble of claim 1 CH-A-508 433.
  • Such known continuous casting devices can be operated with good results, in particular when the metal inlet is closed to the outside, since the access of air to the liquid metal can be prevented and the regulation of the amount of metal supplied can be controlled, in particular at high casting speeds. Difficulties arise in the area of the fixed casting body in that it has to be sealed against the mold walls moving in the casting direction in order to avoid the escape of liquid metal to the outside.
  • a nozzle for supplying molten metal during strip casting in caterpillar molds is known, the part of which comes into contact with the casting metal consists of a heat-resistant and chemically resistant material with poor thermal conductivity.
  • the nozzle mouthpiece is all-round, i.e. around its entire circumference with inserts made of a self-lubricating material These protrude from the surface of the mouthpiece just enough to prevent any direct contact between the nozzle surface and the mold halves, and on the other hand to prevent casting metal from penetrating into the play between the mouthpiece and the mold halves.
  • the order of magnitude for the play between the mouthpiece and the mold halves is in the range between 0.2 to 0.3 mm, the dimension of 0.3 mm being at the upper limit in terms of preventing the penetration of molten metal.
  • the FR-PS 1 094517 describes a generic metal inlet, the cast body - apart from a metallic jacket, if necessary - consist of a refractory material with low thermal conductivity and is supported by several guide rails on the walls of the mold, which is designed as a rigid body.
  • the mold walls are optionally covered with graphite in the area of the casting body, i.e. with a good heat-conducting material, lined.
  • the technical problem on which the invention is based is that the forces acting between the molten metal and the mold material or cast-in body necessitate very small gap dimensions for a purely mechanical seal; at the high casting temperatures, particularly for copper and steel and their high aggressiveness for refractory materials, these cannot be maintained over the necessary period of a few hours.
  • the liquid metal entering the gap between the mold walls and the casting body could have a sealing effect when it solidified completely; however, this solidification process is undesirable and disadvantageous, since the metal which has just solidified is continuously torn out of the gap or else grinds on the moving mold walls and would thus damage their surface. This would result in destruction of the metal skin just created, a poor surface of the cast product and possibly damage to the continuous casting device.
  • the invention then includes the finding that a continuous casting process under stationary conditions is only possible if no bridge of solidified metal is formed in the gap between the facing surfaces of the mold walls and the casting body. It is therefore important to prevent the metal from solidifying on the casting body, since otherwise there is a risk of bridging to the mold. So that the onset of solidification does not reach the casting body, i.e.
  • the mold walls are equipped with a suitable heat-insulating coating and move so quickly relative to the casting body that the gap area filled with liquid metal only as much metal flows as is consumed by solidification and is removed by the movement of the mold walls: between the mold walls and at least the outlet area of the casting body, there is always a two-phase area in which the metal flowing into the gap is just consumed by solidification in the solidification area.
  • the invention thus conveys the teaching that the gap between the casting body and the moving mold walls can be automatically sealed by solidifying metal, provided that the material properties and the geometric relationships of the components to be sealed against one another, depending on the speed of the mold walls, caused by the setting of the gap are coordinated with one another such that the amount of metal flowing into the gap corresponds to the amount of solidified metal conveyed out of the gap with the mold walls.
  • the subject of the invention therefore requires a movement of the mold walls which is coordinated with the gap dimension, since only then does the liquid region in the gap remain by maintaining a balance between the quantity of liquid metal supplied and the quantity of solidifying metal discharged. Since liquid metal is allowed to flow into the gap, this shows considerably, depending on the speed of the mold walls, among other things larger dimensions than the previously known comparable devices.
  • Powder and alcoholic suspensions based on glass, slag, graphite, ceramic-graphite are used in particular as coating materials for the mold walls; however, the coating can also be produced using suitable salts, fats and oils.
  • the gap in the subject of the invention is set so that it is more than 0.3 mm and at most up to 2 mm.
  • Preferred embodiments are characterized in that the gap is not larger than 1.5 or 1 mm (claims 2 and 3).
  • the mutually facing walls of the mold and the casting body are advantageously designed and arranged in such a way that they run parallel to one another at least in the outlet region of the casting body.
  • the gap between the casting body and the moving mold walls is preferably set to a value between 0.5 and 1 mm, the speed of the mold walls being between 10 and 20 meters per minute (claim 4).
  • Such an embodiment is particularly suitable for casting steel.
  • the guide rails can in particular also be movably guided in the casting body using spring elements.
  • the guide rails can be height-adjustable within the cast body, in particular by adjusting wedges or similar remote-controlled lifting devices.
  • the guide rails are expediently designed to be relatively narrow on the side facing the mold walls; their width transverse to the longitudinal direction of the cast body is preferably not more than five millimeters (claim 7).
  • the outlet region of the casting body is equipped with a bore which widens in the shape of a funnel; the wall of the bore advantageously has a convex curvature, but under certain circumstances also a straight line or concave curvature.
  • the curvature of the outlet area which is tailored to the casting problem, optimally achieves the following goals: high mechanical stability of the pouring area of the pouring body, sufficiently high heat capacity and heat conduction to the outside, i.e. in the direction of the mold, and extensive calming of the turbulent flow.
  • the outlet area and the remaining area of the casting body are expediently connected to one another in a manner which permits thermally induced dimensional changes (claim 13); in particular, the two areas of the casting body can be fastened to one another by plug connections.
  • Si 3 N 4 , BN or cermet are used in particular as suitable materials for the exit area; the rest of the casting body can be made in particular of refractory high-alumina ceramic, such as silimanite stone.
  • the above-mentioned connection which allows displacements is particularly advantageous if the outlet region of the cast-in body - in contrast to its remaining region - consists of a material with good thermal conductivity (claim 16).
  • the gap in the outlet region of the casting body is advantageously filled with inert gas; the inert gas pressure is chosen so that its size is slightly below that of the metallostatic pressure of the melt in the outlet area (claim 14). Since the inert gas pressure is always lower than the already mentioned metallostatic pressure of the melt, the inert gas cannot get into the liquid metal and into the casting line.
  • An embodiment of the subject matter of the invention with an inert gas seal preferably additionally has the features of claim 15.
  • the metal inlet according to the invention has, as essential components, band-shaped mold walls 2 moved in the direction of arrow 1 and a fixed casting body 3, which in turn is composed of an outlet area 4 and a rear remaining area 5.
  • the areas 4 and 5 consist of a material with good (area 4) or with low (area 5) thermal conductivity.
  • the liquid metal to be cast is introduced in the direction of arrow 6 through a bore 7 in the casting body 3 between the moving mold walls 2; the solidification range emanating from this is denoted by 8.
  • the operating conditions prevailing during the casting process are therefore selected such that just as much liquid metal flows in through the gap-shaped liquid region 8 'as there is after the solidification of the mold walls 2 by their movement to the right (arrow 1).
  • the casting body 3 on the side facing the mold walls 2 (that is to say in the area of the outer surfaces 4 'and 5' in FIG. 1) is equipped with guide rails 10 on which support the mold walls 2 with a low preload (see Fig. 2).
  • the width b of these guide rails is preferably not more than five millimeters, their mutual distance a transverse to the longitudinal direction of the cast body 3 is not more than two hundred millimeters.
  • the guide rails 10 In order to be able to change the guiding effect of the guide rails 10, if necessary, they can be held in an adjustable manner in the casting body 3, in a modification of the embodiment shown in FIG. 2; In addition, it is possible to arrange the guide rails 10 movably in the casting body 3 with the interposition of spring elements.
  • the guide rails 10 - viewed in the direction of the longitudinal axis 7 '(or in the direction of the arrows 1 and 6) - come as close as possible to the exit edge 4 "of the exit area 4; however, their distance from this exit edge must be such that that they are in any case outside the solidification area 8 indicated in FIG. 1 - which extends into the gap 9.
  • the distance c of the front edges of the guide rails 10 from the trailing edge 4 is therefore not less than thirty millimeters (cf. FIG. 1).
  • the outlet area 4 of the casting body 3 is equipped with an annular channel 11, through which inert gas is guided into the gap between the components 2 and 4.
  • the ring channel 11 is connected via a feed line 12 to an inert gas source, not shown.
  • the pressure of the inert gas is dimensioned such that it is constantly slightly below the value of the metallostatic pressure in the melt in the area of the exit edge 4 "of the exit area 4.
  • the inert gas present prevents the melt from penetrating too far into the gap between the components 2 and 4, without the risk of storing inert gas in the casting line.
  • the ring channel 11 On the rear side facing away from the trailing edge 4 ′′, the ring channel 11 is closed by a seal 13 which is in contact with the mold walls 2 at the same time.
  • the subject matter of the invention is not limited to use in connection with belt-shaped mold walls; it can also interact with mold walls of a different design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Dental Prosthetics (AREA)
  • Catching Or Destruction (AREA)
  • Feeding And Watering For Cattle Raising And Animal Husbandry (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (16)

1. Dispositif pour introduire le métal fondu dans un moule de coulée continue, comportant un corps de coulée (3) fixe en matériau réfractaire, ainsi qu'un moule équipé de parois mobiles (2) dans le sens de la coulée et enrobant partiellement le corps de coulée (3), de manière à ménager un entrefer entre les faces opposées des parois du moule et le corps de coulée (3), au moins à la hauteur de la zone de sortie (4) de ce même corps de coulée, caractérisé en ce que les parois des moules portent un revêtement assurant l'isolation thermique, en ce que la largeur de l'entrefer (9) se situe entre plus de 0,3 mm et 2 mm, et en ce que la vitesse de déplacement des parois du moule est déterminée de manière qu'une zone liquide (8'), remplie de métal fondu, se trouve maintenue dans l'entrefer entre la zone de solidification (8), partant des parois (2) du moule et le corps de coulée (3).
2. Dispositif selon la revendication 1, caractérisé en ce que l'entrefer (9) peut atteindre, selon le cas, une largeur maximale de 1,5 mm.
3. Dispositif selon la revendication 1, caractérisé en ce que l'entrefer (9) peut atteindre, selon le cas, une largeur maximale de 1 mm.
4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'entrefer est réglé sur une largeur de 0,5 à 1 mm, et en ce que la vitesse de déplacement des parois du moule (2) se situe entre 10 à 20 mètres par minute.
5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'entrefer (9) entre les parois du moule (2) et le corps de coulée (3) est déterminé par l'intermédiaire de rails de guidage (10) maintenus sur ce dernier et s'appuyant sous une légère précontrainte contre les parois du moule.
6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, vue transversalement au sens longitudinal du corps de coulée (3), la distance maximale entre les rails de guidage (10) est de 200 mm.
7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la largeur maximale des rails de guidage (10), disposés transversalement au sens longitudinal du corps de coulée (3), est de 5 mm.
8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les rails de guidage (10) se rapprochent de l'arête de sortie (4") du corps de coulée (3), vu dans le sens longitudinal, pour limiter, selon le cas, à 30 mm la distance entre les rails de guidage (10) et l'arête de sortie (4") du corps de coulée.
9. Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les rails de guidage (10) se rapprochent de l'arête de sortie (4") du corps de coulée, vu dans le sens longitudinal, pour limiter, selon le cas, à 50 mm la distance entre le rail de guidage (10) et l'arête de sortie (4") du corps de coulée.
10. Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé en ce que les rails de guidage gardent une certaine mobilité dans le corps de coulée (3).
11. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que les rails de guidage (10) sont réalisés dans le même matériau que le corps de coulée (3).
12. Dispositif selon l'une quelconque des revendications 1 à 11, caractérisé en ce que la zone de sortie (4) du corps de coulée (3) comporte un percement (7) s'évasant en forme d'entonnoir dans le sens de la coulée (flèche 6).
13. Dispositif selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la zone de sortie (4) et la zone complémentaire (5) du corps de coulée (3) sont reliées entre elles selon un procédé qui admet les variations dimensionnelles provoquées par les sollicitations thermiques.
14. Dispositif selon l'une quelconque des revendications 1 à 13, caractérisé en ce que, dans la zone de sortie (4) du corps de coulée, l'entrefer (9) contient un gaz inerte dont la pression est légèrement inférieure à la pression métallostatique de la coulée dans cette zone de sortie (4).
15. Dispositif selon la revendication 14, caractérisé en ce que, sur la face extérieure tournée vers les parois (2) du moule, le corps de coulée (3) comporte un canal annulaire (11) qui est branché sur une source d'alimentation en gaz placée à l'extérieur du moule, et qui, sur la face opposée à la zone de sortie (4), est obturé par rapport aux parois du moule.
16. Dispositif selon l'une quelconque des revendications 1 à 15, caractérisé en ce que la zone de sortie (4) du corps de coulée se compose, contrairement à la zone complémentaire (5), d'un matériau présentant une bonne conductivité thermique.
EP81104544A 1980-08-01 1981-06-12 Dispositif pour introduire le métal fondu dans un moule de coulée continu dont les parois sont mobiles Expired EP0045365B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81104544T ATE6215T1 (de) 1980-08-01 1981-06-12 Metalleinlauf in stranggiessvorrichtungen mit bewegten kokillenwaenden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029223A DE3029223C2 (de) 1980-08-01 1980-08-01 Einlauf für die Metallschmelze in Stranggießvorrichtungen
DE3029223 1980-08-01

Publications (2)

Publication Number Publication Date
EP0045365A1 EP0045365A1 (fr) 1982-02-10
EP0045365B1 true EP0045365B1 (fr) 1984-02-15

Family

ID=6108679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104544A Expired EP0045365B1 (fr) 1980-08-01 1981-06-12 Dispositif pour introduire le métal fondu dans un moule de coulée continu dont les parois sont mobiles

Country Status (9)

Country Link
EP (1) EP0045365B1 (fr)
JP (1) JPS5752549A (fr)
AT (1) ATE6215T1 (fr)
BR (1) BR8104956A (fr)
CA (1) CA1182617A (fr)
DD (1) DD201650A5 (fr)
DE (2) DE3029223C2 (fr)
ES (1) ES8205366A1 (fr)
ZA (1) ZA815269B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325716C2 (de) * 1983-07-16 1985-08-14 Fried. Krupp Gmbh, 4300 Essen Gießdüsen-Mundstück für Stahlschmelze verarbeitende Stranggießkokillen mit in Gießrichtung mitlaufenden Kokillenwänden
DE3345982C2 (de) * 1983-12-20 1985-11-14 Fried. Krupp Gmbh, 4300 Essen Einlauf für die Metallschmelze in Stranggießvorrichtungen, die eine feststehende feuerfeste Gießdüse und eine Kokille mit nur in Gießrichtung bewegten Kokillenwänden aufweisen
DE3401024C2 (de) * 1984-01-13 1986-01-16 Fried. Krupp Gmbh, 4300 Essen Aus mehreren Längsabschnitten bestehende Gießdüse zum Zuführen von Metallschmelze in eine Stranggießkokille und Verfahren zur Herstellung des Mundstücks einer derartigen Gießdüse
DE3403152C2 (de) * 1984-01-31 1986-02-20 Fried. Krupp Gmbh, 4300 Essen Verfahren zum Zuführen von Stahlschmelze aus einem Zwischenbehälter in eine Doppelbandstranggießkokille und Zwischenbehälter zur Durchführung des Verfahrens
ES2008705B3 (es) * 1986-03-10 1989-08-01 Larex Ag Cierre hermetico de una tobera de colada de la camara de colada de undispositivo de colada continua.
CA2128398C (fr) * 1994-07-19 2007-02-06 John Sulzer Appareil de coulee en continue de bandes metalliques, injecteur utilise pour ce faire et procede connexe
AT405254B (de) * 1996-02-20 1999-06-25 Hulek Anton Raupenkokille für eine stranggussanlage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1094517A (fr) * 1953-11-25 1955-05-20 Installation de coulée pour métaux en fusion
US3598173A (en) * 1968-10-17 1971-08-10 Olin Mathieson Continuous casting machine having a variable mold length and adapted for casting in a variety of sizes at high speed
CH508433A (de) * 1970-06-24 1971-06-15 Prolizenz Ag C O Schweiz Kredi Düse für die Zuführung des geschmolzenen Metalles beim Bandgiessen in Raupenkokille
FR2121418A1 (en) * 1971-01-12 1972-08-25 Technicon Instr Horizontal continuous casting
CH618366A5 (fr) * 1977-05-05 1980-07-31 Prolizenz Ag

Also Published As

Publication number Publication date
ES503761A0 (es) 1982-06-01
ES8205366A1 (es) 1982-06-01
DD201650A5 (de) 1983-08-03
DE3029223A1 (de) 1982-11-04
ZA815269B (en) 1982-10-27
JPS5752549A (en) 1982-03-29
DE3029223C2 (de) 1984-09-27
EP0045365A1 (fr) 1982-02-10
DE3162265D1 (en) 1984-03-22
ATE6215T1 (de) 1984-03-15
BR8104956A (pt) 1982-04-20
CA1182617A (fr) 1985-02-19

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