EP0293647B1 - Continuous casting permanent mould for continuously casting of non-ferrous metals - Google Patents
Continuous casting permanent mould for continuously casting of non-ferrous metals Download PDFInfo
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- EP0293647B1 EP0293647B1 EP88107594A EP88107594A EP0293647B1 EP 0293647 B1 EP0293647 B1 EP 0293647B1 EP 88107594 A EP88107594 A EP 88107594A EP 88107594 A EP88107594 A EP 88107594A EP 0293647 B1 EP0293647 B1 EP 0293647B1
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- continuous casting
- graphite
- casting mould
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- graphite body
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
Definitions
- the present invention relates to a continuous casting mold for the continuous casting of non-ferrous metals from an outer metal jacket carrying a coolant and an inner one-part or multi-part graphite body forming the mold cavity.
- Such continuous casting molds have been known for a long time ("Manual of continuous casting” by Dr. Herrmann, 1958, pp. 592 - 598), they are mainly used in the casting of copper or copper alloys with the aim of reacting the casting material with the material of the To avoid mold cavity forming mold wall.
- the graphite body often also referred to as a mold insert, can be pressed or shrunk in as a cylindrical shaped body in an outer casing tube, for example made of copper, but it can also consist of individually layered plates which form the longitudinal and transverse sides of a rectangular mold cavity.
- the invention is therefore based on the object of designing a continuous casting mold of the type mentioned at the outset in such a way that alloys of this type can also be cast into products of high quality which contain low-melting admixtures.
- This object is achieved according to the invention in that a diffusion barrier acting transversely to the casting direction is arranged within the graphite body.
- the invention is based on the knowledge that the elements of the admixtures that evaporate at melting temperatures diffuse through the wall of the graphite body and sublimate on the adjacent metal surface of the cooling jacket, for example a copper plate, that is, they change to the solid state immediately before the gaseous or vaporous state .
- This rainfall leads with increasing casting time to an increasing deterioration of the heat transfer and thereby to faulty casting products, but it also means a danger for the positive connection of the graphite jacket and the heat sink, so that mechanical deformations of the graphite insert cannot be excluded.
- vapor diffusion through the graphite body excluded from the outset to the adjacent metal surfaces of low temperature, trouble-free operation of the system is guaranteed for any non-ferrous alloys.
- the diffusion barrier in the graphite body itself has the consequence that the metal vapors released during the continuous casting are kept at a temperature level which prevents sublimation of the alloy elements or reduces them to a negligible value for operation.
- a casting mold for the continuous casting of a billet is known per se, in which a metal is galvanically deposited on the graphite lining (DE-OS 2106634), this on the side facing away from the mold cavity of the graphite lining, which directly adjoins the cooling jacket and thus is kept at its temperature level, but is not suitable to prevent sublimation of metal vapors diffusing through the graphite lining.
- the diffusion barrier consists of one or more metal foils arranged within the graphite body or the lining.
- Such metal foils approximately in a thickness of 0.010 to 0.1 mm, preferably 0.02 to 0.06 mm, completely seal off the area of the graphite body facing the cooling jacket against steam diffusion.
- the difficulties described at the beginning no longer occur.
- the diffusion-tight foil can be made of any metal, but a copper foil has proven to be the most advantageous for the purposes of the invention, for example for reasons of corrosion and assembly technology.
- the graphite body or insert does not consist of a cylindrical molded part made of pressed powder material, but of graphite plates layered transversely to the casting direction, then, in a further development of the invention, it is expedient to arrange the metal foil or the corresponding foils in each case between two adjacent graphite plates. For reasons of assembly technology, it can be advantageous if the metal foils are held in position by an adhesive. Suitable adhesives on the market have the necessary thermal conductivity and temperature resistance.
- metal particles are embedded in the graphite body. These metal particles can be metal chips embedded in the graphite, but also embedded metal powder or corresponding granules can prevent the metal vapors from reaching the area of the cooling jacket in order to sublimate there.
- the metal ponds are expediently pressed with powdered graphite to form a one-piece graphite body or to individual molded parts, such as plates, half-cylinders and the like, which can later be assembled into a single body.
- the metal particles are pressed with the graphite in layers or zones.
- the diffusion barrier according to the invention can be arranged at different locations in the graphite body or in any areas, depending on the local conditions and the structure of the respective continuous casting mold. However, in a continuation of the inventive concept, it has proven to be particularly advantageous to arrange the diffusion barrier at least in the first third of the wall thickness of the graphite body or insert, based on the mold cavity. If, for example, the graphite body consists of assembled individual plates, then one will expediently proceed as follows: that at least the plates immediately adjacent to the mold cavity have or contain the diffusion layer.
- the considerations that led to the invention consist in preventing the vaporous metals from passing through the graphite body to the regions of lower temperature.
- the diffusion barrier according to the invention in particular in the form of a metallic foil, now leads to an enrichment of the gases or vapors on the side of the diffusion barrier facing the mold cavity.
- this gas accumulation at a temperature level that is not yet suitable for sublimation, provides resistance to further replenishment of volatile metals from the melt, in a further embodiment of the invention it is also possible to provide means for completely or partially removing the accumulated gases or vapors to the outside. Suitable for this are e.g. porous ceramic tubes pressed into the graphite body or inserted between the plates.
- the mold 4 is cooled with water in a conventional manner by means of a cooler, not shown, so that the melt in the mold solidifies and the strand is drawn continuously or discontinuously from the mold 4 by means of a pulling device 6 in the direction of the arrow in the course of the solidification of further flowing melt 2 can be.
- the cast strand 5 can be cut into production lengths by means of the separating device 7.
- FIG. 2 shows a section through the mold 4. Cooling water 9 circulates within the jacket 9, the corresponding water connections being designated by 10 and 11.
- the graphite insert 12 e.g. is constructed from individual graphite plates, is fitted into the jacket 8 so that there is a positive connection in the border area 13 between the graphite insert 12 and the jacket 8.
- the graphite insert 12 contains the diffusion barrier 14, so that this connection is not released during operation and for the proper cooling of the molten metal 2 in the area of the mold 4, the diffusion barrier 14 is provided.
- This diffusion barrier here in the form of a continuous copper foil, is expedient , as also shown, arranged more in the inner region of the graphite insert 12.
- the diffusion barrier 14 is thus at a temperature level that is higher than the limit area 13, and volatile metal vapors are not precipitated from the melt 2, or only to an insignificant extent for the operational sequence. Diffusion of the metal vapors through the graphite insert 12 up to the border area 13 between insert and jacket 8 is definitely avoided.
- the copper foil which acts as a diffusion barrier, but also any other suitable metal foil, can be held in place by an adhesive.
- Another advantageous possibility according to the invention is that the graphite plates, between which the metal foil is inserted, are held together in a form-fitting manner by suitable screw connections.
- the mold 4 shown in the operating state shows at 15 approximately the area of the melt which is still in the liquid state, at 16 is the area in which the melt is already pasty and at 17 the area in which the melt has solidified, and consequently the strand 5 can be withdrawn from the mold 4.
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Description
Die vorliegende Erfindung betrifft eine Stranggießkokille zum kontinuierlichen Gießen von Nichteisenmetallen aus einem ein Kühlmittel führenden äußeren Metallmantel und einem inneren, den Formhohlraum bildenden ein- oder mehrteiligen Graphitkörper.The present invention relates to a continuous casting mold for the continuous casting of non-ferrous metals from an outer metal jacket carrying a coolant and an inner one-part or multi-part graphite body forming the mold cavity.
Solche Stranggießkokillen sind seit langem bekannt ("Handbuch des Stranggießens" von Dr. Herrmann, 1958, S. 592 - 598), sie werden vor allem beim Gießen von Kupfer oder Kupferlegierungen eingesetzt mit dem Ziel, eine Reaktion des Gießwerkstoffes mit dem Werkstoff der den Formhohlraum bildenden Kokillenwandung zu vermeiden. Der Graphitkörper, oft auch als Kokilleneinsatz bezeichnet, kann als zylindrischer Formkörper in einem äußeren z.B. aus Kupfer bestehenden Mantelrohr eingepreßt oder eingeschrumpft sein, er kann aber auch aus einzeln geschichteten Platten bestehen, die die Längs-und Querseiten eines rechteckförmigen Formhohlraumes bilden. Unabhängig von der jeweiligen Ausführungsform der Kokille ist für einen störungsfreien Gießbetrieb und die Erzeugung fehlerfreier Gießprodukte entscheidend, daß die formschlüssige mechanische Verbindung zwischen äußerem Kühlmantel und innerem Graphitkörper gewahrt und der einwandfreie Wärmeübergang zwischen dem Graphitkörper und dem Kühlmedium zur Vermeidung von Wärmestaus sichergestellt ist.Such continuous casting molds have been known for a long time ("Manual of continuous casting" by Dr. Herrmann, 1958, pp. 592 - 598), they are mainly used in the casting of copper or copper alloys with the aim of reacting the casting material with the material of the To avoid mold cavity forming mold wall. The graphite body, often also referred to as a mold insert, can be pressed or shrunk in as a cylindrical shaped body in an outer casing tube, for example made of copper, but it can also consist of individually layered plates which form the longitudinal and transverse sides of a rectangular mold cavity. Regardless of the particular embodiment of the mold, it is crucial for trouble-free casting operation and the production of faultless casting products that the form-fitting mechanical connection between the outer cooling jacket and the inner graphite body is maintained and that it is flawless Heat transfer between the graphite body and the cooling medium to avoid heat build-up is ensured.
Es hat sich jedoch gezeigt, daß auch eine ordnungsgemäße formschlüssige Einpassung des gegebenenfalls aus Einzelelementen bestehenden Graphitkörpers in den umgebenden Kühlmantel sowie der vorgeschriebene Wärmeübergang zwischen diesen beiden Teilen der Stranggießkokille zum Gießbeginn nicht immer ausreichen, hochwertige Gießprodukte herzustellen. Dies gilt insbesondere für alle die Fälle, bei denen Legierungen, besonders Kupferlegierungen, vergossen werden, die niedrig schmelzende und verdampfende Legierungselemente als Beimengungen aufweisen. Hierzu gehört beispielsweise das Element Zink, das in Kupferbasislegierungen, wie Messing, Neusilber und ähnlichen Legierungen enthalten ist.However, it has been shown that even a correct positive fit of the graphite body, which may consist of individual elements, into the surrounding cooling jacket and the prescribed heat transfer between these two parts of the continuous casting mold at the start of casting are not always sufficient to produce high-quality cast products. This applies in particular to all the cases in which alloys, in particular copper alloys, are cast which have low-melting and evaporating alloy elements as admixtures. This includes, for example, the element zinc, which is contained in copper-based alloys such as brass, nickel silver and similar alloys.
Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Stranggießkokille der eingangs erwähnten Art derart auszubilden, daS damit auch solche Legierungen zu Produkten hoher Qualität gegossen werden können, die niedrig schmelzende Beimengungen enthalten.The invention is therefore based on the object of designing a continuous casting mold of the type mentioned at the outset in such a way that alloys of this type can also be cast into products of high quality which contain low-melting admixtures.
Gelöst wird diese Aufgabe gemäß der Erfindung dadurch, daß innerhalb des Graphitkörpers eine quer zur Gießrichtung wirkende Diffusionssperre angeordnet ist. Die Erfindung beruht nämlich auf der Erkenntnis, daß die bei Schmelztemperaturen verdampfenden Elemente der Beimengungen durch die Wandung des Graphitkörpers hindurchdiffundieren und auf der angrenzenden Metallfläche des Kühlmantels, etwa einer Kupferplatte, sublimieren, d. h. unmittelbar vor dem gas- oder dampfförmigen Zustand in den festen Zustand übergehen. Dieser Niederschlag führt mit steigender Gießdauer zu einer wachsenden Verschlechterung des Wärmeübergangs und dadurch zu fehlerhaften Gießprodukten, er bedeutet aber auch eine Gefahr für die formschlüssige Verbindung von Graphitmantel und Kühlkörper, so daß mechanische Verformungen des Graphiteinsatzes nicht ausgeschlossen werden können. Wird nun, wie nach der Erfindung vorgesehen, eine Dampfdiffusion durch den Graphitkörper hindurch zu den angrenzenden Metallflächen geringer Temperatur von vornherein ausgeschlossen, ist ein störungsfreier Betrieb der Anlage für beliebige Legierungen auf Nichteisenbasis gewährleistet. Die Diffusionssperre im Graphitkörper selbst hat nämlich zur Folge, daß die beim Stranggießen freiwerdenden Metalldämpfe auf einem Temperaturniveau gehalten werden, das eine Sublimation der Legierungselemente verhindert bzw. auf einen für den Betrieb vernachlässigbaren Wert absenkt.This object is achieved according to the invention in that a diffusion barrier acting transversely to the casting direction is arranged within the graphite body. The invention is based on the knowledge that the elements of the admixtures that evaporate at melting temperatures diffuse through the wall of the graphite body and sublimate on the adjacent metal surface of the cooling jacket, for example a copper plate, that is, they change to the solid state immediately before the gaseous or vaporous state . This rainfall leads with increasing casting time to an increasing deterioration of the heat transfer and thereby to faulty casting products, but it also means a danger for the positive connection of the graphite jacket and the heat sink, so that mechanical deformations of the graphite insert cannot be excluded. Now, as provided according to the invention, vapor diffusion through the graphite body excluded from the outset to the adjacent metal surfaces of low temperature, trouble-free operation of the system is guaranteed for any non-ferrous alloys. The diffusion barrier in the graphite body itself has the consequence that the metal vapors released during the continuous casting are kept at a temperature level which prevents sublimation of the alloy elements or reduces them to a negligible value for operation.
An sich ist zwar eine Gießform zum kontinuierlichen Gießen eines Barrens bekannt, bei der auf der Graphitauskleidung ein Metall galvanisch niedergeschlagen ist (DE-OS 2106634), diese auf der dem Formhohlraum der Graphitauskleidung abgekehrten Seite angeordnete Metallschicht, die unmittelbar an den Kühlmantel angrenzt und somit auf dessen Temperaturniveau gehalten wird, ist aber gerade nicht geeignet, eine Sublimation von durch die Graphitauskleidung hindurchdiffundierenden Metalldämpfen zu verhindern.A casting mold for the continuous casting of a billet is known per se, in which a metal is galvanically deposited on the graphite lining (DE-OS 2106634), this on the side facing away from the mold cavity of the graphite lining, which directly adjoins the cooling jacket and thus is kept at its temperature level, but is not suitable to prevent sublimation of metal vapors diffusing through the graphite lining.
Eine Ausführungsform der Erfindung ergibt sich dadurch, daß die Diffusionssperre aus einer oder mehreren innerhalb des Graphitkörpers oder der Auskleidung angeordneten Metallfolien besteht. Solche Metallfolien, etwa in einer Dicke von 0,010 bis 0,1 mm, vorzugsweise 0,02 bis 0,06 mm, schotten den dem Kühlmantel zugekehrten Bereich des Graphitkörpers gegen eine Dampfdiffusion völlig ab. Die eingangs geschilderten Schwierigkeiten treten nicht mehr auf. Die diffusionsdichte Folie kann aus beliebigem Metall hergestellt sein, eine Kupferfolie hat sich jedoch, beispielsweise aus Korrosions- und montagetechnischen Gründen,als für die Zwecke der Erfindung als am vorteilhaftesten erwiesen.An embodiment of the invention results from the fact that the diffusion barrier consists of one or more metal foils arranged within the graphite body or the lining. Such metal foils, approximately in a thickness of 0.010 to 0.1 mm, preferably 0.02 to 0.06 mm, completely seal off the area of the graphite body facing the cooling jacket against steam diffusion. The difficulties described at the beginning no longer occur. The diffusion-tight foil can be made of any metal, but a copper foil has proven to be the most advantageous for the purposes of the invention, for example for reasons of corrosion and assembly technology.
Besteht der Graphitkörper oder -einsatz nicht aus einem zylindrischen Formteil aus gepreßtem Pulvermaterial, sondern aus quer zur Gießrichtung geschichteten Graphitplatten, dann ist es in Weiterführung der Erfindung zweckmäßig, die Metallfolie oder die entsprechenden Folien jeweils zwischen zwei aneinander-grenzenden Graphitplatten anzuordnen. Aus montagetechnischen Gründen kann es dabei von Vorteil sein, wenn die Metallfolien durch einen Kleber in Lage gehalten sind. Im Markt befindliche geeignete Kleber weisen die hierfür notwendige Wärmeleitfähigkeit und Temperaturbeständigkeit auf.If the graphite body or insert does not consist of a cylindrical molded part made of pressed powder material, but of graphite plates layered transversely to the casting direction, then, in a further development of the invention, it is expedient to arrange the metal foil or the corresponding foils in each case between two adjacent graphite plates. For reasons of assembly technology, it can be advantageous if the metal foils are held in position by an adhesive. Suitable adhesives on the market have the necessary thermal conductivity and temperature resistance.
Eine andere Möglichkeit, innerhalb des Graphitkörpers oder der -auskleidung für eine Diffusionssperre zu sorgen, ist in Durchführung der Erfindung die, wenn im Graphitkörper Metallteilchen eingelagert werden. Diese Metallteilchen können im Graphit eingelagerte Metallspäne sein, aber auch eingelagertes Metallpulver oder entsprechendes Granulat kann hier die Metalldämpfe hindern, in den Bereich des Kühlmantels zu gelangen, um dort zu sublimieren.Another possibility of providing a diffusion barrier within the graphite body or the lining is, in carrying out the invention, if metal particles are embedded in the graphite body. These metal particles can be metal chips embedded in the graphite, but also embedded metal powder or corresponding granules can prevent the metal vapors from reaching the area of the cooling jacket in order to sublimate there.
Die Metallteichen werden zweckmäßig mit pulverförmigem Graphit zum einstückigen Graphitkörper oder zu einzelnen, später zu einem einzigen Körper zusammenfügbaren Formteilen, wie Platten, Halbzylindern und dergl. verpreßt. Dabei kann es zur Lösung der der Erfindung zugrundeliegenden Aufgabe zweckmäßig sein, daß, bezogen auf den Querschnitt des Graphitkörpers, die Metallteilchen mit dem Graphit in Schichten oder Zonen verpreßt sind.The metal ponds are expediently pressed with powdered graphite to form a one-piece graphite body or to individual molded parts, such as plates, half-cylinders and the like, which can later be assembled into a single body. In order to achieve the object on which the invention is based, it may be expedient that, based on the cross section of the graphite body, the metal particles are pressed with the graphite in layers or zones.
Die Diffusionssperre nach der Erfindung läßt sich je nach den örtlichen Gegebenheiten und dem Aufbau der jeweiligen Stranggießkokille an im Graphitkörper unterschiedlichen Stellen oder in beliebigen Bereichen anordnen. Als besonders vorteilhaft hat es sich jedoch in Weiterführung des Erfindungsgedankens erwiesen, die Diffusionssperre mindestens im ersten Drittel der Wanddicke des Graphitkörpers oder -einsatzes, bezogen auf den Formhohlraum, anzuordnen. Besteht beispielsweise der Graphitkörper aus zusammengefügten Einzelplatten, dann wird man zweckmäßig so vorgehen, daß mindestens die an den Formhohlraum unmittelbar angrenzenden Platten die Diffusionsschicht aufweisen bzw. beinhalten.The diffusion barrier according to the invention can be arranged at different locations in the graphite body or in any areas, depending on the local conditions and the structure of the respective continuous casting mold. However, in a continuation of the inventive concept, it has proven to be particularly advantageous to arrange the diffusion barrier at least in the first third of the wall thickness of the graphite body or insert, based on the mold cavity. If, for example, the graphite body consists of assembled individual plates, then one will expediently proceed as follows: that at least the plates immediately adjacent to the mold cavity have or contain the diffusion layer.
Die Überlegungen, die zur Erfindung geführt haben, bestehen darin, einen Durchtritt der dampfförmigen Metalle durch den Graphitkörper hindurch zu den Bereichen niedrigerer Temperatur zu vermeiden. Die erfindungsgemäße Diffusionssperre, insbesondere in Form einer metallischen Folie führt nun zu einer Anreicherung der Gase oder Dämpfe auf der dem Formhohlraum zugekehrten Seite der Diffusionssperre. Abgesehen davon, daß diese Gasansammlung in einem für eine Sublimation noch nicht geeigneten Temperaturniveau einem weiteren Nachschub flüchtiger Metalle aus der Schmelze Widerstand entgegenbringt, kann man in einer weiteren Ausgestaltung der Erfindung auch Mittel vorsehen, die angesammelten Gase oder Dämpfe ganz oder teilweise nach außen abzuführen. Geeignet hierfür sind z.B. in den Graphitkörper eingepreßte oder zwischen die Platten eingelegte poröse Keramikröhrchen.The considerations that led to the invention consist in preventing the vaporous metals from passing through the graphite body to the regions of lower temperature. The diffusion barrier according to the invention, in particular in the form of a metallic foil, now leads to an enrichment of the gases or vapors on the side of the diffusion barrier facing the mold cavity. In addition to the fact that this gas accumulation, at a temperature level that is not yet suitable for sublimation, provides resistance to further replenishment of volatile metals from the melt, in a further embodiment of the invention it is also possible to provide means for completely or partially removing the accumulated gases or vapors to the outside. Suitable for this are e.g. porous ceramic tubes pressed into the graphite body or inserted between the plates.
Die Erfindung sei an Hand der in den Fig. 1 und 2 als Ausführungsbeispiel dargestellten Stranggießkokille für das Bandstranggießen von zinkhaltigen Kupferlegierungen näher erläutert.The invention will be explained in more detail with reference to the continuous casting mold shown in FIGS. 1 and 2 for the continuous strip casting of zinc-containing copper alloys.
Mit 1 ist ein Warmhalteofen bezeichnet, der die zu vergießende Kupferlegierung als flüssige Schmelze 2 enthält. Am unteren Teil des Warmhalteofens 1 befindet sich ein Auslaß 3, der in die Kokille 4 mündet. Die Kokille 4 ist in üblicher Weise mittels eines nicht dargestellten Kühlers mit Wasser gekühlt, so daß die in der Kokille befindliche Schmelze erstarrt und der Strang im Zuge der Erstarrung weiterer nachfließender Schmelze 2 kontinuierlich oder diskontinuierlich aus der Kokille 4 mittels einer Zieheinrichtung 6 in Pfeilrichtung abgezogen werden kann. Mittels der Trennvorrichtung 7 kann der gegossene Strang 5 in Fertigungslängen zugeschnitten werden.1 with a holding furnace is designated, which contains the copper alloy to be cast as a
In einem gegenüber der Fig. 1 vergrößerten Maßstab zeigt die Fig. 2 einen Schnitt durch die Kokille 4. Innerhalb des Mantels 9 läuft Kühlwasser 9 um, die entsprechenden Wasseranschlüsse sind mit 10 und 11 bezeichnet. Der Graphiteinsatz 12, der z.B. aus einzelnen Graphitplatten aufgebaut ist, ist in den Mantel 8 so eingepaßt, daß eine formschlüssige Verbindung im Grenzbereich 13 zwischen dem Graphiteinsatz 12 und dem Mantel 8 besteht. Damit diese Verbindung auch im Laufe des Betriebes nicht gelöst wird und zur einwandfreien Kühlung des schmelzflüssigen Metalles 2 im Bereich der Kokille 4 die Wärmeabfuhr ungestört möglich ist, enthält der Graphiteinsatz 12 die Diffusionssperre 14. Diese Diffusionssperre, hier in Form einer durchgehenden Kupferfolie, ist zweckmäßig, wie auch dargestellt, mehr im inneren Bereich des Graphiteinsatzes 12 angeordnet. Damit befindet sich die Diffusionssperre 14 auf einem gegenüber dem Grenzbereich 13 erhöhten Temperaturniveau, ein Niederschlag flüchtiger Metalldämpfe aus der Schmelze 2 findet nicht oder nur in einem für den Betriebsablauf unerheblichen Maße statt. Eine Diffusion der Metalldämpfe durch den Graphiteinsatz 12 hindurch bis an den Grenzbereich 13 zwischen Einsatz und Mantel 8 ist mit Sicherheit vermieden.On an enlarged scale compared to FIG. 1, FIG. 2 shows a section through the
Die als Diffusionssperre wirkende Kupferfolie, aber auch jede andere geeignete Metallfolie kann durch einen Kleber in Lage gehalten werden. Eine andere vorteilhafte Möglichkeit ist nach der Erfindung die, daß die Graphitplatten, zwischen denen die Metallfolie eingebracht ist, durch geeignete Schraubverbindungen formschlüssig zusammengehalten werden.The copper foil, which acts as a diffusion barrier, but also any other suitable metal foil, can be held in place by an adhesive. Another advantageous possibility according to the invention is that the graphite plates, between which the metal foil is inserted, are held together in a form-fitting manner by suitable screw connections.
Die im Betriebszustand dargestellte Kokille 4 zeigt bei 15 etwa den Bereich der noch im flüssigen Zustand befindlichen Schmelze, bei 16 liegt der Bereich, in dem die Schmelze schon teigig und bei 17 der Bereich, in dem die Schmelze erstarrt ist, und demzufolge der Strang 5 aus der Kokille 4 abgezogen werden kann.The
Claims (15)
- A continuous casting mould (4) for the continuous casting of non-ferrous metals, comprising an outer metal casing (8) which conducts a coolant and an inner one-piece or multi-piece graphite body (12) which forms the moulding cavity, characterised in that a diffusion barrier (14), which operates transversely to the direction of casting, is arranged inside the graphite body (12).
- A continuous casting mould (4) as claimed in Claim 1, characterised in that the diffusion barrier (14) comprises one or more metal sheets arranged inside the graphite body.
- A continuous casting mould (4) as claimed in Claim 2, characterised in that the metal sheet has a thickness of 0.010 to 0.1 mm, preferably 0.02 to 0.06 mm.
- A continuous casting mould (4) as claimed in Claim 2 or 3, characterised in that the metal sheet is a copper sheet.
- A continuous casting mould (4) as claimed in Claim 2 or one of the following Claims, wherein the graphite body (12) consists of graphite plates stacked transversely to the direction of casting, characterised in that the metal sheet(s) is(are) arranged between two mutually adjacent graphite plates.
- A continuous casting mould (4) as claimed in Claim 5, characterised in that the metal sheet(s) is(are) retained by an adhesive.
- A continuous casting mould (4) as claimed in Claim 5, characterised In that the graphite plates, between which the metal sheet(s) is(are) introduced, are held together in interlocking engagement by screw connections.
- A continuous casting mould (4) as claimed in Claim 1, characterised in that the diffusion barrier (14) consists of metal particles embedded in the graphite body (12).
- A continuous casting mould (4) as claimed in Claim 8, characterised in that the metal particles are metal chips embedded in the graphite body (12).
- A continuous casting mould (4) as claimed in Claim 8, characterised in that the metal particles comprise metal powder or granulate embedded in the graphite body (12).
- A continuous casting mould (4) as claimed in one of Claims 8 to 10, characterised in that the metal particles are compressed with the powdery graphite.
- A continuous casting mould (4) as claimed in Claim 11, characterised in that the metal particles are compressed with the graphite in layers.
- A continuous casting mould (4) as claimed in one of Claims 1 to 12, characterised in that the diffusion barrier (14) is arranged within the first third of the wall thickness of the graphite body (12).
- A continuous casting mould (4) as claimed in one of Claims 1 to 13, wherein the graphite body (12) is composed of plates, characterised in that at least those plates which are directly adjacent to the moulding cavity are provided with the diffusion barrier (14).
- A continuous casting mould (4) as claimed in one of Claims 1 to 14, characterised in that the graphite body (12) comprises channels composed of porous ceramic pipes by which the gases, which are inhibited by the diffusion barrier (14) in their movement transversely to the direction of casting, are discharged from the graphite body (12) in the direction of casting.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3718372 | 1987-06-02 | ||
| DE19873718372 DE3718372A1 (en) | 1987-06-02 | 1987-06-02 | CONTINUOUS CHOCOLATE FOR THE CONTINUOUS CASTING OF NON-FERROUS METALS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0293647A2 EP0293647A2 (en) | 1988-12-07 |
| EP0293647A3 EP0293647A3 (en) | 1989-10-11 |
| EP0293647B1 true EP0293647B1 (en) | 1991-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88107594A Expired - Lifetime EP0293647B1 (en) | 1987-06-02 | 1988-05-11 | Continuous casting permanent mould for continuously casting of non-ferrous metals |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0293647B1 (en) |
| DE (2) | DE3718372A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19505689C2 (en) * | 1995-02-20 | 2003-10-02 | Ald Vacuum Techn Ag | Casting mold for the production of castings from reactive metals |
| ES2716126T3 (en) | 2015-03-06 | 2019-06-10 | Covestro Deutschland Ag | Aqueous polyurethane urea dispersion containing free acid groups |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT212985B (en) * | 1958-06-12 | 1961-01-10 | Wieland Werke Ag | Continuous casting mold |
| DE2106634A1 (en) * | 1971-02-12 | 1972-08-24 | Mitsubishi Kinzoku Kogyo K.K., Tokio | Graphite wall continuous casting mould - with a metal skin |
| DE2634633C2 (en) * | 1976-07-31 | 1984-07-05 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | Continuous casting mold made of a copper material, especially for continuous casting of steel |
| GB2087769B (en) * | 1980-11-22 | 1984-08-01 | Mapplebeck John E Ltd | Casting mould |
-
1987
- 1987-06-02 DE DE19873718372 patent/DE3718372A1/en not_active Withdrawn
-
1988
- 1988-05-11 DE DE8888107594T patent/DE3867127D1/en not_active Expired - Lifetime
- 1988-05-11 EP EP88107594A patent/EP0293647B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3867127D1 (en) | 1992-02-06 |
| DE3718372A1 (en) | 1988-12-15 |
| EP0293647A3 (en) | 1989-10-11 |
| EP0293647A2 (en) | 1988-12-07 |
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