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EP0293647B1 - Coquille de coulée pour coulée continue de métaux non ferreux - Google Patents

Coquille de coulée pour coulée continue de métaux non ferreux Download PDF

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Publication number
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
Authority
EP
European Patent Office
Prior art keywords
continuous casting
graphite
casting mould
metal
graphite body
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 - Lifetime
Application number
EP88107594A
Other languages
German (de)
English (en)
Other versions
EP0293647A3 (en
EP0293647A2 (fr
Inventor
Hans W. Dipl.-Ing. Brinkmann
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.)
Stolberger Metallwerke GmbH and Co KG
Original Assignee
Stolberger Metallwerke GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stolberger Metallwerke GmbH and Co KG filed Critical Stolberger Metallwerke GmbH and Co KG
Publication of EP0293647A2 publication Critical patent/EP0293647A2/fr
Publication of EP0293647A3 publication Critical patent/EP0293647A3/de
Application granted granted Critical
Publication of EP0293647B1 publication Critical patent/EP0293647B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Confectionery (AREA)

Claims (15)

  1. Coquille de coulée en continu (4) pour la coulée en continu de métaux non ferreux, coquille constituée par une enveloppe métallique externe (8) dans laquelle passe un fluide de refroidissement et par un corps en graphite interne (12) en une ou plusieurs parties, constituant l'espace de creux de mise en forme, coquille de coulée en continu caractérisée en ce qu à l'intérieur du corps en graphite (12) est disposé un barrage de diffusion (14) agissant transversalement par rapport à la direction de coulée.
  2. Coquille de coulée en continu (4) selon la revendication 1, caractérisée en ce que le barrage de diffusion (14) est constitué par une ou plusieurs feuilles métalliques disposées à l'intérieur du corps en graphite.
  3. Coquille de coulée en continu (4) selon la revendication 2, caractérisée en ce que la feuille métallique a une épaisseur de 0,01 à 0,1 mm, de préférence de 0,02 à 0,06 mm.
  4. Coquille de coulée en continu (4) selon la revendication 2 ou la revendication 3, caractérisée en ce que la feuille métallique est une feuille de cuivre.
  5. Coquille de coulée en continu (4) selon la revendication 2 ou bien une autre des suivantes, coquille dans laquelle, le corps en graphite (12) est constitué par des plaques de graphite superposées transversalement par rapport à la direction de coulée, coquille caractérisée en ce que la feuille métallique ou les feuilles métalliques est disposée ou sont disposées respectivement entre deux plaques de graphite adjacentes.
  6. Coquille de coulée en continu (4) selon la revendication 5, caractérisée en ce que la feuille métallique ou les feuilles métalliques, est maintenue ou sont maintenues, par une colle.
  7. Coquille de coulée en continu (4) selon la revendication 5, caractérisée en ce que les plaques de graphite entre lesquelles est insérée la feuille métallique ou bien sont insérées les feuilles métalliques, sont maintenues ensemble avec interpénétration de formes par des vis de liaison.
  8. Coquille de coulée en continu (4) selon la revendication 1, caractérisée en ce que le barrage de diffusion (14) est constitué par des particules métalliques incluses dans le corps en graphite (12).
  9. Coquille de coulée en continu (4) selon la revendication 8, caractérisée en ce que les particules métalliques sont des copeaux métalliques inclus dans le corps en graphite (12).
  10. Coquille de coulée en continu (4) selon la revendication 8, caractérisée en ce que les particules métalliques sont constituées par une poudre métallique ou bien des granulés métalliques inclus dans le corps en graphite (12).
  11. Coquille de coulée en continu (4) selon une des revendications 8 à 10, caractérisé en ce que les particules métalliques sont pressées avec le graphite pulvérulent.
  12. Coquille de coulée en continu (4) selon la revendication 11, caractérisée en ce que les particules métalliques sont pressées par couches avec le graphite.
  13. Coquille de coulée en continu (4) selon une des revendications 1 à 12, caractérisée en ce que le barrage de diffusion (14) est disposé à l'intérieur du premier tiers de l'épaisseur de la paroi du corps en graphite (12).
  14. Coquille de coulée en continu (4) selon une des revendications 1 à 13, coquille dans laquelle le corps en graphite (12) est constitué par des plaques, caractérisée en ce que, au moins les plaques immédiatement adjacentes à l'espace creux de mise en forme comportent le barrage de diffusion (14).
  15. Coquille de coulée en continu (4) selon une des revendications 1 à 14, caractérisée en ce que le corps en graphite (12) comporte des canaux constitués par des tubes de céramique poreuse qui évacuent hors du corps en graphite (12) dans la direction de la coulée, les gaz gênés par le barrage de diffusion (14) dans leur déplacement, transversalement par rapport à la direction de la coulée.
EP88107594A 1987-06-02 1988-05-11 Coquille de coulée pour coulée continue de métaux non ferreux Expired - Lifetime EP0293647B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3718372 1987-06-02
DE19873718372 DE3718372A1 (de) 1987-06-02 1987-06-02 Stranggiesskokille zum kontinuierlichen giessen von nichteisenmetallen

Publications (3)

Publication Number Publication Date
EP0293647A2 EP0293647A2 (fr) 1988-12-07
EP0293647A3 EP0293647A3 (en) 1989-10-11
EP0293647B1 true EP0293647B1 (fr) 1991-12-27

Family

ID=6328836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107594A Expired - Lifetime EP0293647B1 (fr) 1987-06-02 1988-05-11 Coquille de coulée pour coulée continue de métaux non ferreux

Country Status (2)

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EP (1) EP0293647B1 (fr)
DE (2) DE3718372A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19505689C2 (de) * 1995-02-20 2003-10-02 Ald Vacuum Techn Ag Gießform zum Herstellen von Gußteilen aus reaktiven Metallen
ES2716126T3 (es) 2015-03-06 2019-06-10 Covestro Deutschland Ag Dispersión acuosa de poliuretano-urea que contiene grupos ácidos libres

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT212985B (de) * 1958-06-12 1961-01-10 Wieland Werke Ag Stranggießkokille
DE2106634A1 (en) * 1971-02-12 1972-08-24 Mitsubishi Kinzoku Kogyo K.K., Tokio Graphite wall continuous casting mould - with a metal skin
DE2634633C2 (de) * 1976-07-31 1984-07-05 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Stranggießkokille aus einem Kupferwerkstoff, insbesondere zum Stranggießen von Stahl
GB2087769B (en) * 1980-11-22 1984-08-01 Mapplebeck John E Ltd Casting mould

Also Published As

Publication number Publication date
DE3718372A1 (de) 1988-12-15
EP0293647A3 (en) 1989-10-11
EP0293647A2 (fr) 1988-12-07
DE3867127D1 (de) 1992-02-06

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