EP0125509B1 - Moule monobloc de coulée continue et procédé de sa fabrication - Google Patents

Moule monobloc de coulée continue et procédé de sa fabrication Download PDF

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Publication number
EP0125509B1
EP0125509B1 EP84104204A EP84104204A EP0125509B1 EP 0125509 B1 EP0125509 B1 EP 0125509B1 EP 84104204 A EP84104204 A EP 84104204A EP 84104204 A EP84104204 A EP 84104204A EP 0125509 B1 EP0125509 B1 EP 0125509B1
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EP
European Patent Office
Prior art keywords
mould
layer
precipitated
thickness
feature
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
EP84104204A
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German (de)
English (en)
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EP0125509A1 (fr
Inventor
Egon Evertz
Rolf Prof. Dr.-Ing. Seybold
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Individual
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Individual
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Priority to AT84104204T priority Critical patent/ATE29405T1/de
Publication of EP0125509A1 publication Critical patent/EP0125509A1/fr
Application granted granted Critical
Publication of EP0125509B1 publication Critical patent/EP0125509B1/fr
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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings

Definitions

  • the invention relates to a process for producing a one-part continuous casting mold with a composite layer metal wall, the inner layer of which is deposited in a layer thickness up to 35% of the total wall thickness of a wear-resistant metal, such as nickel, on a metal core, and the outer , layer consisting of copper is applied galvanically.
  • a wear-resistant metal such as nickel
  • a method of this type is known from DE-A 27 01 636.
  • an insert made of fibers, mats or meshes for reinforcement is used, which is provided between the electrodeposited inner layer and the outer layer.
  • the inner layer After the inner layer has been deposited on the core, it is expanded by heating in relation to the core and thereby removed from the core, wrapped with the reinforcement material and further provided with a reinforcement insert in the later bathroom mirror area.
  • the outer metal layer made of copper is then galvanically connected to the reinforced inner layer. Then the mold is finished inside and out.
  • one-piece continuous casting molds of the aforementioned type are used for the production of billet formats up to 160 mm edge length and for small bloom formats.
  • the inner layer made of nickel has a high degree of wear resistance, so that the service life of the molds is improved and the susceptibility of the strand to longitudinal, transverse and cross cracks is reduced.
  • a very complex internal machining must be carried out because the required dimensional accuracy is to be maintained up to 1/100 mm.
  • the object of the invention is to achieve the advantage of a wear-reducing inner coating with considerably less effort in such a way that there is an increased service life with a reduction in tears of the billets produced.
  • the inner layer should not only be of a uniform thickness, but also of a particularly smooth inner wall.
  • the inner layer deposited on the core in the proposed manner detaches from the latter without difficulty. Since the core specifies the geometrical inner shape exactly and is very smooth, the inner layer does not require any post-processing because it maintains the assumed design and smoothness of the core. In addition, there is a material bond between the inner layer and the outer layer, which on the one hand reliably avoids separation of one layer from the other layer, and on the other hand, due to the dense, metallic structure, a heat flow also in the area of the transition from the inner layer into the outer layer allows unhindered, so that the cooling performance of such a mold is very good.
  • the machining of the end faces of the mold ensures the necessary dimensional accuracy for the connection of a water cooling box.
  • the grooves that are unavoidable during mechanical processing are not disruptive. Rather, the mechanical sealants can also be taken into account in the mechanical processing.
  • a groove can be provided for inserting a sealing cord.
  • the pressurization leads to solidification on the outer surface of the mold and furthermore makes it easier to detach the finished mold from the core.
  • the shape and surface of the core are transferred particularly reliably to the inner wall of the inner layer if the separating layer is deposited in the form of an approximately 1 ⁇ m thick layer of chromium, in which micro-cracks are produced after the deposition after treatment in hot water, whereupon then a light copper coating is deposited as a conductive layer, on which the inner layer of nickel is applied in a thickness of approximately 2 mm, which is finally followed by the outer layer of copper in twice the thickness as the nickel layer.
  • the internal tensile stresses in the nickel layer can be limited, for which otherwise, with increasing thickness, much higher values must be expected.
  • the electrolytic solutions without such additives are advantageously used.
  • Both electrolytic and electroless nickel plating, as are known from DE-A 30 38 289, can serve as a reference for the electrolytic solutions.
  • the inner layer which is about 2 mm, can be produced not only sufficiently free of stress, but also sufficiently free of disruptive additives.
  • the new mold can also be made from electrodeposited layers of just one material, such as copper or only nickel.
  • the composite layer metal wall allows the property values to be optimally adjusted, with particularly good scatterability being achieved by reducing the temperature and / or the pH content of the solution in the electroless or current-carrying deposition of the inner layer.
  • the pressurization can be applied in different ways. It leads to a slight reshaping of the deposited mold, which, however, does not bother especially when using a core of a longer length than the intended mold, because the end faces can be adjusted to the exact size by mechanical processing after later detachment from the core.
  • the pressurization can also be combined with a targeted deformation in the manner mentioned.
  • the continuous casting mold consists of the inner layer 1, which was deposited on the slightly conical core 6 indicated by dashed lines.
  • Separating layer agents known from the galvanoplastic process are suitable for this.
  • the thinnest metal salt layers such as in the case of core made of metal in the treatment of the same in borate, chromate. , Oxalate, sulfide and iodite solutions can be achieved.
  • B crushed graphite dust is also suitable not only as a conductive layer, but also as a separating layer.
  • the core can also be chemically silver-plated in order to be easily separated from the galvanoplastic product. With some metals that form thin oxide layers, such as with chromium-nickel steels, a separating layer is often even unnecessary.
  • the conductive layer is then applied in a known manner. This can happen on plastic cores through chemical silver plating. Brushing in graphite is one of the best known means of realizing a conductive layer.
  • the layer 1 consisting of nickel is first deposited on the core 6 treated in the manner described above, followed by the considerably thicker layer 2 consisting of copper.
  • the scatterability of the nickel deposition is very good, the surface of the deposited layer is even more uneven than a mechanically processed layer. It is precisely this unevenness that leads to a particularly firm connection with the copper layer. Diffusion processes occur, particularly with prolonged use, in the edge zone of the two layers, which promote a close material bond.
  • the treatment of the core begins with the application of a micro-cracked chrome layer with a thickness of approximately 1 ⁇ .
  • the separation takes place here from a solution in which 240 to 320 grams of chromic acid anhydride (Cr0 3 ) is dissolved per liter of water. 0.1% sulfuric acid (H 2 SO 4 ) is also added to this solution.
  • the chrome layer is then deposited with a relatively high current density of 15 to 24 A / dm 2 . This layer is then treated with hot water. This causes the micro-cracks to tear open and develop.
  • the chrome layer is passivated particularly reliably by treatment with hot water, so that it offers a good prerequisite for separation.
  • the chrome layer mentioned is subsequently treated with a sulfuric acid copper sulfate solution, in which about 240 grams of CuS0 4 and 60 grams of H 2 S0 4 , each per liter, are dissolved. In addition, 90 to 100 mg CI- per liter are added. At a current density of 4 to 6 A / dm 2 , a very thin copper layer is deposited, which fills the micro-cracks and forms a thin layer of approximately 1.5 ⁇ .
  • the actual inner layer is applied from a nickel sulfamate bath in which there are about 80 grams of nickel sulfamate / L, 3 grams of CI / liter and 40 grams of H 3 B0 3 / liter.
  • the current density is 1 to 2 A / dm 2 in order to achieve a fine deposition.
  • the copper layer is deposited from the aforementioned acidic copper bath, but in this case only with a current density of 1 to 1.5 A / dm 2 .
  • the mold is then still on the core made of steel. It is treated on the core by means of a thin roller supported by a stronger roller, the thickness of which is smaller than the wall thickness of the mold. It is thereby achieved that an overall reduction in the wall thickness of approximately 0.5% takes place during the roller treatment, primarily in the vicinity of the outer copper layer treated directly with the roller. This leads in particular to a solidification of the outer copper layer, so that the latter not only is largely smooth after treatment, but is also of increased resistance to mechanical stress.
  • the pressure treatment of the electroplated mold can also be successfully carried out by work hardening the copper outer layer in the region of its edge zone in such a way that the outer surface of the mold is subjected to shot peening. This has an effect similar to hammering or surface rolling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (8)

1. Procédé de fabrication d'une busette de coulée continue monopièce avec une paroi métallique en pseudoalliage (1, 2) dont la couche intérieure (1) est séparée par galvanoplastie, pour une épaisseur de couche allant jusqu'à 35 % de l'épaisseur de paroi totale en un métal résistant à l'usure tel que nickel, sur un noyau (6) en métal, et dont la couche extérieure en cuivre, est déposée galvaniquement, caractérisée en ce que le noyau (6) lisse fournissant la forme géométrique exacte est d'abord muni d'une couche de séparation et d'une couche conductrice, que la couche intérieure (1) est séparée par une densité de courant plus faible, par rapport à la couche extérieure (2), d'environ 1 Aldm2, par une teneur en métal inférieure et une température diminuée de l'électrolyte et/ou une teneur en pH supérieure de ladite, et que, après séparation de la couche extérieure (2), les deux faces d'extrémité (3, 4) de la coquille peuvent être mises exactement aux positions et dimensions nécessaires au raccordement d'un caisson d'eau de refroidissement (5).
2. Procédé selon la revendication 1, caractérisé en ce que les couches (1, 2) de la busette sont déposées sur un noyau (6) d'une longueur supérieure à celle de la busette.
3. Procédé selon les revendications 1 et 2, caractérisé en ce que la surface extérieure de la busette est consolidée par application de pression.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la couche de séparation sur le noyau est séparée sous la forme d'une couche de chrome d'environ 1 µm d'épaisseur, couche pour laquelle des microfissures sont provoquées par traitement en eau chaude après séparation, et en ce qu'ensuite un revêtement en cuivre bouchant les microfissures est déposé en tant que couche conductrice, revêtement sur lequel est déposé du nickel en une épaisseur d'environ 2 mm en tant que couche intérieure (1), sur laquelle est ensuite déposée une couche de cuivre d'une épaisseur double de celle de la couche de nickel formant la couche extérieure (2).
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que les surfaces extérieures de la busette située sur le noyau (6) sont soumises, après séparation des couches (1, 2), à l'influence de galets de pression au moyen desquels l'épaisseur de la paroi de la busette est réduite.
6. Procédé selon la revendication 5, caractérisé en ce que les galets présentent un diamètre inférieur à celui des parois de la busette et sont soutenues, lors de la mise sous pression, par des galets de support beaucoup plus épaisses, et en ce que l'épaisseur de paroi de la busette est réduite, lors de la mise sous pression, d'environ 0.5%.
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la surface extérieure de la busette est soumise, après séparation des couches galvanoplastiques (1, 2), à l'influence d'un traitement de grenaillage.
8. Procédé selon l'une des revendications 1 à 7 caractérisé en ce que la couche intérieure (1) est séparée avec des particules de matière solide.
EP84104204A 1983-04-14 1984-04-13 Moule monobloc de coulée continue et procédé de sa fabrication Expired EP0125509B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104204T ATE29405T1 (de) 1983-04-14 1984-04-13 Einteilige durchlaufstranggiesskokille und verfahren zu ihrer herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3313503 1983-04-14
DE19833313503 DE3313503A1 (de) 1983-04-14 1983-04-14 Einteilige durchlaufstranggiesskokille und verfahren zu ihrer herstellung

Publications (2)

Publication Number Publication Date
EP0125509A1 EP0125509A1 (fr) 1984-11-21
EP0125509B1 true EP0125509B1 (fr) 1987-09-09

Family

ID=6196366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104204A Expired EP0125509B1 (fr) 1983-04-14 1984-04-13 Moule monobloc de coulée continue et procédé de sa fabrication

Country Status (5)

Country Link
US (1) US4586557A (fr)
EP (1) EP0125509B1 (fr)
AT (1) ATE29405T1 (fr)
CA (1) CA1219727A (fr)
DE (2) DE3313503A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013114326A1 (de) 2013-12-18 2015-06-18 Thyssenkrupp Steel Europe Ag Gießkokille zum Vergießen von Stahlschmelze

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3436331A1 (de) * 1984-10-04 1986-04-17 Mannesmann AG, 4000 Düsseldorf Einrichtung zur temperaturmessung in wassergekuehlten metallwaenden von metallurgischen gefaessen, insbesondere von stranggiesskokillen
FI75748C (fi) * 1986-08-15 1988-08-08 Outokumpu Oy Kokill.
DE4128365A1 (de) * 1991-08-27 1993-03-04 Egon Evertz Verfahren zur aufarbeitung von kupferkokillen fuer das stranggiessen von stahl
US5609922A (en) * 1994-12-05 1997-03-11 Mcdonald; Robert R. Method of manufacturing molds, dies or forming tools having a cavity formed by thermal spraying
DE19834394A1 (de) * 1998-07-30 2000-02-03 Rheinmetall W & M Gmbh Waffenrohr mit einer verschleißmindernden Hartchromschicht
DE102022108882A1 (de) * 2022-04-12 2023-10-12 Schock Gmbh Gießform zur Herstellung eines eine Vorder- und eine Rückseite aufweisenden Gießkörpers aus einer aushärtbaren Gießmasse
DE102022108881A1 (de) * 2022-04-12 2023-10-12 Schock Gmbh Gießform zur Herstellung eines eine Vorder- und eine Rückseite aufweisenden Gießkörpers aus einer aushärtbaren Gießmasse

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US30979A (en) * 1860-12-18 Railway-signal
US938688A (en) * 1909-08-21 1909-11-02 Wesley Groff Nichols Method of casting metals.
US3450189A (en) * 1966-08-22 1969-06-17 Int Nickel Co Process of coating metal castings
GB1215184A (en) * 1968-07-02 1970-12-09 Chelton Forming Ltd Improvements in or relating to the making of hollow articles by metal spraying
US3595300A (en) * 1969-08-21 1971-07-27 Nordberg Manufacturing Co Method of casting wearing part having retaining structure
JPS5256018A (en) * 1975-11-05 1977-05-09 Kouka Kuroomu Kougiyou Kk Method of manufacturing continuous casting mould for steel
DE2634633C2 (de) * 1976-07-31 1984-07-05 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Stranggießkokille aus einem Kupferwerkstoff, insbesondere zum Stranggießen von Stahl
DE2701636A1 (de) * 1977-01-17 1978-07-20 Kabel Metallwerke Ghh Kokille aus metall zum stranggiessen von metallen
USRE30979E (en) 1977-01-28 1982-06-22 Technicon Instruments Corporation Method and apparatus for casting metals
SU806237A1 (ru) * 1977-10-10 1981-02-23 Украинский Научно-Исследовательскийинститут Металлов Горизонтальный кристаллизатор дл НЕпРЕРыВНОй РАзлиВКи
AT359225B (de) * 1978-03-23 1980-10-27 Voest Alpine Ag Drehfeld-stranggiesskokille
DE2936177A1 (de) * 1979-09-07 1981-05-21 Evertz, Egon, 5650 Solingen Verfahren und vorrichtung zur behandlung von kokillenwaenden
JPS5691964A (en) * 1979-12-24 1981-07-25 Hitachi Zosen Corp Mold of continuous casting apparatus
DE3038289A1 (de) * 1980-10-10 1982-05-27 Egon 5650 Solingen Evertz Verfahren zum abscheiden von metallschichten auf den waenden von kokillen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013114326A1 (de) 2013-12-18 2015-06-18 Thyssenkrupp Steel Europe Ag Gießkokille zum Vergießen von Stahlschmelze

Also Published As

Publication number Publication date
DE3313503A1 (de) 1984-10-18
ATE29405T1 (de) 1987-09-15
CA1219727A (fr) 1987-03-31
DE3465906D1 (en) 1987-10-15
US4586557A (en) 1986-05-06
EP0125509A1 (fr) 1984-11-21

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