EP1520643B1 - Procédé pour revêtir une lingotière d'une machine de coulée continue - Google Patents

Procédé pour revêtir une lingotière d'une machine de coulée continue Download PDF

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Publication number
EP1520643B1
EP1520643B1 EP04021767A EP04021767A EP1520643B1 EP 1520643 B1 EP1520643 B1 EP 1520643B1 EP 04021767 A EP04021767 A EP 04021767A EP 04021767 A EP04021767 A EP 04021767A EP 1520643 B1 EP1520643 B1 EP 1520643B1
Authority
EP
European Patent Office
Prior art keywords
coating
metal
wear protection
protection layer
ceramic wear
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
EP04021767A
Other languages
German (de)
English (en)
Other versions
EP1520643A1 (fr
Inventor
Hans-Jürgen Hemschemeier
Dietmar Kolbeck
Hans-Günter Wobker
Dirk Rode
Hans Dirk Piwowar
Gerhard HUGENSCHÜTT
Roland Hauri
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.)
Cunova GmbH
Original Assignee
KME Germany 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 KME Germany GmbH and Co KG filed Critical KME Germany GmbH and Co KG
Publication of EP1520643A1 publication Critical patent/EP1520643A1/fr
Application granted granted Critical
Publication of EP1520643B1 publication Critical patent/EP1520643B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying

Definitions

  • the invention relates to a method for coating a mold body used in a continuous casting plant according to the features in the preamble of patent claim 1.
  • the basic structure of a mold usually consists of an outer steel construction and the actual forming part of the mold, the Kokillenanalysis, which today consists almost entirely of copper or a copper alloy.
  • the steel shell supporting the mold body has the task of positioning the mold body and ensuring the water circulation required for cooling. In the continuous casting of metal smaller formats predominantly Kokillenrohre be used.
  • the cast strand forms in the mold tube due to the high heat extraction of a cast strand shell, which must have sufficient dimensional stability when leaving the mold tube. Due to the temperature reduction of the cast metal, the cross section of the cast strand decreases with increasing casting time. In order to ensure the most continuous possible contact of the cast strand shell with Kokillenrohrober Design, the cross section and the opening dimension of Kokillenrohrs is also carried out from the top to the foot with a matched to the cast strand shell conicity. However, the different metal types due to their composition on a different shrinkage behavior, so that the taper of a mold tube is not suitable for every type of metal. If the conicity of the Kokillenrohrs or the Kokillen stressess too large, heavy wear can occur within the Kokillenrohrs.
  • the inner surface of the mold tube In order to reduce the wear of the mold tube, it is known to provide the inner surface of the mold tube with a galvanic wear protection layer of hard chrome.
  • the layer thickness of this hard chrome layer is usually 0.05 mm to 0.12 mm. Due to the galvanic deposition process, the layer thickness in the Kokillenrohrecken is made thinner.
  • the invention is based on the object, a method for coating a mold body used in a continuous casting made of copper or a copper alloy with an inner coating of chromium show by which a particularly high wear resistance, especially in the lower part of the mold body can be achieved, as well as a Kokillenanalysis show with these properties.
  • a further coating is applied to the inner coating of chromium by means of a thermal spraying process.
  • the additional coating is a metal-ceramic wear protection layer whose layer hardness differs by a factor of 0.6 to 2 from the layer hardness of the inner coating.
  • the layer hardness of the metal-ceramic wear protection layer may be in a range from 650 HV to 2,000 HV, preferably in a range from 1,100 HV to 1,400 HV.
  • Layer thicknesses of up to 0.2 mm of the metal-ceramic wear protection layer are possible, the layer thickness preferably increasing in the casting direction. In principle, the layer height can also be constant over the entire extent of the metal-ceramic wear protection layer.
  • a metal-ceramic wear protection layer in the context of the invention is a coating which has carbide and oxidic constituents.
  • the height of the coated region is dependent on the size of the mold body, which in principle can be a one-part mold tube within the scope of the invention.
  • the term die body in the context of the invention also means a multi-part casting mold, for example a plate mold.
  • the height of the metal-ceramic wear protection layer can be up to half the length of the mold tubes Kokillenrohrs amount.
  • the layer thickness distribution can vary over its horizontal course, ie transversely to the wedge shape.
  • the layer thickness on side surfaces of a mold tube may differ from the layer thickness in the corner regions of the mold tube.
  • the design of the metal-ceramic wear protection layer is adapted to the typical wear pattern of the mold body. Therefore, the additional wear protection layer can also be applied only partially, for example only in the corner regions or only on the side surfaces of the mold body.
  • metal-ceramic wear protection layer is applied exclusively in areas in which significantly thinner inner coatings have formed during a galvanic deposition process. Deviations of more than 30% from the average layer thickness of the inner coating are to be understood as significant.
  • the application of the metal-ceramic wear protection layer must be very careful and uniform in order to maintain the desired conicity of the Kokillen stressess.
  • the application of the metal-ceramic wear protection layer takes place with the aid of a robot-controlled coating head whose orientation determines the direction of a coating jet, the coating head passes through a control curve, starting at a starting point in which the coating jet in a Angular range greater than 40 °, in particular in an angular range of 40 ° to 60 ° to the surface to be coated and ending in a reversal point, in which the coating head at an angle less than or equal to 40 °, in particular less than or equal to 20 ° to the coating surface, wherein the beam length measured in the direction of the coating jet is kept substantially constant during the passage through the control curve.
  • the control curve can of course be traversed in both directions.
  • the control cam is preferably a section of a branch of a parabolic cam. That is, the course between reversal point and starting point is strictly monotonically increasing or decreasing, depending on how start and reversal point are oriented with respect to the surface to be coated.
  • the maximum length of the coating jet is dependent on the operating parameters and is preferably in a range of 250 mm to 400 mm.
  • the coating head at the starting point z. B. 300 mm away from the surface to be coated, the coating jet is directed at a 45 ° angle to the surface to be coated. This angle decreases continuously when passing through the control curve until reaching the reversal point.
  • the coating jet sweeps over a larger area at small angles, ie approaching the turning point for a constant time unit than at larger angles, ie when the coating head is in the vicinity of the starting point. Due to the strictly monotonous course of the cam results in these operating parameters continuously increasing or decreasing layer thickness profile of the metal-ceramic wear protection layer.
  • a control cam is selected in which the turning point lies between the starting point and a fictitious end point and in which the tangent of the control curve runs in the fictitious end point parallel to the surface to be coated.
  • the endpoint effectively forms the vertex or saddle point of a parabola.
  • the tangents of the control curve at the starting point and at the reversal point correspond to the directions of the coating jet in the respective Points. Due to the position of the reversal point, the maximum depth of insertion or height of the metal-ceramic wear protection layer is determined starting from the lower edge of the mold body.
  • the coating head is moved when passing through the control curve between the starting point and reversal point and back simultaneously transverse to the coating jet and parallel to the surface to be coated, so that as a result an oscillating, in particular a zigzag-shaped space curve of the Passage coating head.
  • the space curve can also be meander-shaped or, for example, also sinusoidal, whereby a phase shift between the individual space curves can be provided for multiple traverses of the space curves in order to ensure a uniform application of the metal-ceramic wear protection layer.
  • the quasi lateral displacement of the coating head makes it possible to evenly coat larger surfaces with a defined layer thickness distribution.
  • a constant layer thickness can only be ensured by a robot control of the coating head.
  • the control curve and feed rate are programmed in the thermal coating system and these program-defined control curves are traversed one or more times. Basically, it is expedient to run the space curves several times. In accordance with the invention, it is provided that the space curve is traversed 5 to 15 times depending on the desired layer thickness per 0.1 mm to be applied. This means that for a layer thickness of 0.2 mm at the exit end of the cast strand 10 to 30 passes for application of the metal-ceramic wear protection layer are required.
  • the relative residence time of the coating head is greater in particular in the region of the reversal points and the starting points than in the middle region between the reversal points and the starting points, it can be provided that the travel speed of the coating head is a function of its position on the control cam. In particular, it can be provided that the travel speed of the coating head is increased when the direction is reversed.
  • the thickness of the metal-ceramic wear protection layer may increase in the casting direction, wherein corresponding recesses are formed on the inner side of the mold before the application of the inner coating of the thickness and the thickness profile of the metal-ceramic wear protection layer. In this way it is possible to maintain the desired taper of the mold tube. The machine adjustment of the geometry of the mold tube must be made before applying the inner coating of chrome.
  • An optimal adaptation of the metal-ceramic wear protection layer to the desired final contour of the mold body can be achieved if the metal-ceramic wear protection layer is subsequently machined mechanically shaping.
  • individual areas of the metal-ceramic wear protection layer can be machined with tools with a geometrically determined or indefinite cutting edge.
  • the method according to the invention is particularly suitable for coating mold tubes only in the region of their corner radii or deliberately omitting the corner radii and the remaining inner surfaces of the Coating mold tube.
  • the inner coating of chromium, in particular of hard chrome is provided with an additional metal-ceramic wear protection layer, which is applied by means of a thermal spraying process.
  • an additional metal-ceramic wear protection layer which is applied by means of a thermal spraying process.
  • a robot-controlled coating head is used.
  • the layer hardness of the metal-ceramic wear protection layer differs by a factor of 0.6 to 2 from the layer hardness of the inner coating. It is preferably a factor of 1.2 to 1.4 above the layer hardness of the inner coating.
  • the inner coating can be completely or partially covered with the metal-ceramic wear protection layer.
  • FIG. 1 a Kokillenharm referred to in the form of a Kokillenrohrs, which is already provided in a manner not shown with an inner coating of hard chrome.
  • a metal-ceramic wear protection layer is applied by means of a thermal spraying process, whose layer hardness differs by a factor of 0.6 to 2 from the layer hardness of the inner coating of hard chrome.
  • the drawn zigzag-shaped space curve 2 illustrates the course of a coating head, not shown, during the coating process.
  • the space curve 2 is traversed several times from right to left and from left to right as a function of the desired layer thickness according to the pointing in the X direction arrow P 2 , wherein an oscillating movement is performed, as the arrow P 1 illustrates.
  • Each individual branch of the space curve 2 extends between a starting point and a turning point 4, both of which lie on a control cam 5.
  • FIG. 2 shows the possible course of a control cam 5, relative to a surface to be coated 6.
  • the lying between the starting point 3 and the turning point 4 area of the control cam 5 corresponds to a branch of the zigzag-shaped space curve 2 of FIG. 1 ,
  • the cam 5 has a parabolic course, wherein the vertex of the notional parabola is a fictitious end point 7, which lies in the image plane above the surface 6 to be coated.
  • a tangent T which passes through the fictitious end point 7, is parallel to the surface 6 to be coated, which is in this Embodiment is a straight plane. From the illustration it is clear that the turning point 4 is to a certain extent outside the surface 6 or the mold body 1 to be coated.
  • a tangent T 1 through the turning point 4 illustrates the direction of the coating jet 9 and its length L until it hits the surface 6 to be coated.
  • the tangent T 1 encloses an angle ⁇ 1 with the surface to be coated, which is smaller than 20 °
  • the angle ⁇ 2 between the tangent T 2 through the starting point 3 of the coating head includes with the surface 6 to be coated an angle ⁇ 2 , which in this embodiment is about 40 °.
  • the coating head is continuously, between the starting point 3 and the reversal point 4 back and forth (arrow P 1 ) and simultaneously transversely to the coating beam 8 and parallel to the surface to be coated 6 moves so that the zigzag-shaped Course of the space curve 2 gives, as he in FIG. 1 is shown.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Mold Materials And Core Materials (AREA)

Claims (11)

  1. Procédé pour revêtir une lingotière (1) en cuivre ou en alliage de cuivre dans une installation de coulée en continu,
    procédé selon lequel
    la lingotière (1) est munie au moins en partie d'un revêtement intérieur en chrome,
    caractérisé en ce qu'
    on applique sur le revêtement intérieur, une couche anti-usure métal-céramique par un procédé de pulvérisation thermique, la dureté de la couche étant différente selon un coefficient allant de 0,6 jusqu'à 2 par rapport à la dureté du revêtement intérieur,
    l'application de la couche de protection anti-usure de métal-céramique étant faite à l'aide d'une tête de revêtement commandée par un automate et dont l'orientation définit la direction du jet de revêtement (8),
    la tête de revêtement parcourant une courbe de commande (5) en commençant à un point de départ (3) pour lequel le jet de revêtement (8) se trouve dans une plage angulaire de 40° à 90° par rapport à la surface (6) à revêtir et se termine par un point d'inversion (4) dans lequel la tête de revêtement fait un angle inférieur ou égal à 40° par rapport à la surface (6) à revêtir,
    la longueur de jet (L) mesurée dans la direction du jet de revêtement (8) est maintenue constante pendant le passage de la courbe de commande (5).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le point d'inversion (4) se situe entre le point de départ et un point final fictif (7) de la courbe de commande (5), et
    la tangente (T) de la courbe au point final fictif (7) est parallèle à la surface (6) à revêtir.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    le jet de revêtement (8) au point de départ (3) se trouve dans une plage angulaire de 40° à 60° par rapport à la surface (6) à revêtir.
  4. Procédé selon les revendications 1 à 3,
    caractérisé en ce que
    au point d'inversion (4) le jet de revêtement (8) fait un angle (α1) inférieur ou égal à 20° par rapport à la surface à revêtir.
  5. Procédé selon les revendications 1 à 4,
    caractérisé en ce que
    la tête de revêtement est déplacée au passage de la courbe de commande (5) entre le point de départ (3) et le point d'inversion (4) et en retour, en même temps transversalement au jet de revêtement (8) et parallèlement à la surface à revêtir (6) pour avoir une courbe oscillante (2) en trois dimensions.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    la courbe en trois dimensions (2) est parcourue de 5 à 15 fois en fonction de l'épaisseur souhaitée de la couche et de la relation entre l'additif de projection en forme de poudre suivant l'épaisseur de 0,1 mm appliquée.
  7. Procédé selon les revendications 1 à 6,
    caractérisé en ce que
    la vitesse de la tête de revêtement est une fonction de sa position sur la courbe de commande (5).
  8. Procédé selon les revendications 1 à 7,
    caractérisé en ce que
    la couche de protection anti-usure métal-céramique n'est appliquée que dans les zones dans lesquelles une couche intérieure de chrome déposée par voie galvanique possède une épaisseur de couche qui est d'au moins 30 % inférieure à l'épaisseur de couche moyenne du revêtement intérieur.
  9. Procédé selon les revendications 1 à 8,
    caractérisé en ce que
    l'épaisseur de la couche anti-usure métal-céramique augmente dans la direction de coulée et le côté intérieur de la lingotière, avant d'appliquer la couche intérieure, on forme des dégagements correspondant en épaisseur et au profil d'épaisseur de la couche anti-usure métal-céramique.
  10. Procédé selon les revendications 1 à 9,
    caractérisé en ce que
    après son application, par un procédé d'usinage mécanique on adapte la forme géométrique de la couche de protection anti-usure métal-céramique à un contour de consigne.
  11. Procédé selon les revendications 1 à 10,
    caractérisé en ce que
    dans le cas d'une lingotière tubulaire, la couche anti-usure métal-céramique s'introduit par les ouvertures des deux côtés pour appliquer une couche de protection contre l'usure métal-céramique, continue.
EP04021767A 2003-10-01 2004-09-14 Procédé pour revêtir une lingotière d'une machine de coulée continue Expired - Lifetime EP1520643B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10345865A DE10345865A1 (de) 2003-10-01 2003-10-01 Verfahren zum Beschichten eines in einer Stranggießanlage eingesetzten Kokillenkörpers sowie Kokillenkörper einer Stranggießanlage
DE10345865 2003-10-01

Publications (2)

Publication Number Publication Date
EP1520643A1 EP1520643A1 (fr) 2005-04-06
EP1520643B1 true EP1520643B1 (fr) 2009-10-28

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Application Number Title Priority Date Filing Date
EP04021767A Expired - Lifetime EP1520643B1 (fr) 2003-10-01 2004-09-14 Procédé pour revêtir une lingotière d'une machine de coulée continue

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EP (1) EP1520643B1 (fr)
AT (1) ATE446813T1 (fr)
DE (2) DE10345865A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007002806A1 (de) 2007-01-18 2008-07-24 Sms Demag Ag Kokille mit Beschichtung
CN111893416B (zh) * 2020-08-07 2022-08-05 和县卜集振兴标准件厂 一种冷冲压模具表面激光喷涂处理方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5973152A (ja) * 1982-10-21 1984-04-25 Mishima Kosan Co Ltd 連続鋳造用鋳型及びその製造方法
JPH01233047A (ja) 1988-03-15 1989-09-18 Nomura Tokin:Kk 連続鋳造用鋳型の製造方法
US5799717A (en) * 1995-11-17 1998-09-01 Techno Coat Company, Ltd. Copper alloy mold for casting aluminum or aluminum alloy
GB2320034B (en) * 1996-11-08 1998-11-11 Monitor Coatings & Eng Coating of continuous casting machine grid plates
JPH10230348A (ja) 1997-02-20 1998-09-02 Mishima Kosan Co Ltd 連続鋳造用鋳型
US5958520A (en) * 1998-07-13 1999-09-28 Ford Global Technologies, Inc. Method of staggering reversal of thermal spray inside a cylinder bore

Also Published As

Publication number Publication date
DE502004010290D1 (de) 2009-12-10
DE10345865A1 (de) 2005-04-21
EP1520643A1 (fr) 2005-04-06
ATE446813T1 (de) 2009-11-15

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