EP0160635B1 - Method and apparatus for the lubrication of a continuous-casting mould - Google Patents

Method and apparatus for the lubrication of a continuous-casting mould Download PDF

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Publication number
EP0160635B1
EP0160635B1 EP85870056A EP85870056A EP0160635B1 EP 0160635 B1 EP0160635 B1 EP 0160635B1 EP 85870056 A EP85870056 A EP 85870056A EP 85870056 A EP85870056 A EP 85870056A EP 0160635 B1 EP0160635 B1 EP 0160635B1
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EP
European Patent Office
Prior art keywords
lubricant
wall
mold
ingot mould
bar
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
EP85870056A
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German (de)
French (fr)
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EP0160635A2 (en
EP0160635A3 (en
Inventor
Marios Economopoulos
Raymond D'haeyer
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.)
Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Publication date
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Publication of EP0160635A2 publication Critical patent/EP0160635A2/en
Publication of EP0160635A3 publication Critical patent/EP0160635A3/en
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Publication of EP0160635B1 publication Critical patent/EP0160635B1/en
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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
    • B22D11/07—Lubricating the moulds

Definitions

  • the present invention relates to a method for the lubrication of a mold for the continuous casting of metal, in particular steel.
  • the cast metal has a solidified skin of an already significant thickness, which implies cooling of this skin with respect to the molten metal; it follows that the wall of the mold, energetically cooled, is at a temperature much lower than the melting point of the powder. The internal face of this wall is thus covered with a layer of solidified powder, which is formed to the detriment of the film of lubricating agent and which consequently reduces its effectiveness.
  • the subject of the present invention is a method which makes it possible to remedy this drawback by ensuring additional lubrication, in particular in the region near the base of the mold for continuous casting.
  • EP-A 0 060 359 describes a method of lubrication of a continuous casting ingot mold in which at least one passage orifice is formed through the wall of the ingot mold and a lubricating agent through said orifice.
  • a method for the lubrication of a mold for the continuous casting of metal, in particular steel, in which at least one orifice is formed through the wall of said mold and into which one introduces a lubricating agent through said orifice is characterized in that said lubricating agent is introduced in the form of a rod made of a powder having a melting point below the temperature of the material located opposite said orifice and in which causes said lubricant to melt so that it spreads between the wall of said mold and the metal poured into said mold.
  • this material can either be the already solidified skin of the cast metal, or powder frozen on the internal face of the wall of the mold.
  • the bar of lubricating agent melts and lubricates the mold.
  • the melting of the lubricating bar leads to the melting of the frozen powder, the mixing of two molten powders and the resumption of lubrication of the ingot mold.
  • the said lubricant is subjected to preheating, and possibly to the start of melting, while it is in the said orifice for passage through the wall of the ingot mold.
  • the present invention also relates to a device making it possible to implement the method which has just been described.
  • the device of the invention comprising means for ensuring the interduction and the progression of a lubricating agent through the wall of said ingot mold, is characterized in that these means are constituted by orifices allowing the passage of the lubricating agent in the form of a bar and in that it also comprises means for thermal insulation of said lubricating agent with respect to the cooling system of the mold.
  • the term "wall of the mold” should be understood to mean all of the faces of this mold.
  • the device is also equipped with means for heating and / or for melting said lubricating agent.
  • said heating means and / or fusion advantageously consist of a Joule effect heating circuit.
  • the attached figure represents a device according to the invention, installed in the lower zone of a continuous casting mold.
  • the ingot mold 1 is provided with a water cooling circuit shown diagrammatically by the arrows 2 and 3, respectively for entering and leaving the water.
  • two ovens 4 provided with through holes 5 through which bars of lubricant 6 can enter the mold.
  • These ovens are provided with a Joule effect heating system by means of an electric current 1. They are separated from the cooling water by the watertight partitions 7; they are also lined with thermal insulation material 8, in order to avoid any untimely heating of the cooling water of the ingot mold 1.
  • a liquid metal for example molten steel is poured into this ingot mold , a solidified skin 10 is formed on the lateral surface of the ingot 9, the thickness of which increases in the direction of progression of the ingot.
  • the powder 11 deposited on the upper surface of the molten metal melts and, as a result of the oscillation of the ingot mold, flows between the walls of the ingot mold 1 and the skin 10 of the ingot.
  • the invention relates to an ingot mold for continuous casting of metal, in particular steel, preferably equipped in each face with at least one lubrication device as just described.

Abstract

In order to improve the lubrication of a mould (1) for the continuous casting of metal, in particular steel, at least one passage orifice (5) is made through the wall of the said mould, a lubricant is introduced via this orifice and the lubricant is caused to melt such that it spreads between the wall of the mould (1) and the metal (9). The lubricant may be in the form of a bar (6) consisting of a powder with a relatively low melting point; it may be subjected to a preheating and, if appropriate, to an onset of melting while in the passage orifice through the wall of the mould. <IMAGE>

Description

La présente invention concerne un procédé pour la lubrification d'une lingotière de coulée continue de métal, en particulier d'acier.The present invention relates to a method for the lubrication of a mold for the continuous casting of metal, in particular steel.

On sait que la coulée continue d'un métal est une méthode qui consiste à couler le métal liquide dans une lingotière sans fond généralement animée d'un mouvement d'oscillation, dont les parois sont refroidies énergiquement. Sous l'effet de ce refroidissement énergique, la peau du métal coulé se solidifie rapidement et le lingot est alors extrait de la lingotière pour traverser une cage à rouleaux dans laquelle il poursuit et achève sa solidification.It is known that the continuous casting of a metal is a method which consists in casting the liquid metal in a bottomless ingot mold generally animated by an oscillating movement, the walls of which are vigorously cooled. Under the effect of this vigorous cooling, the skin of the cast metal solidifies rapidly and the ingot is then extracted from the ingot mold to pass through a roller cage in which it continues and completes its solidification.

Le début de solidification du métal dans la lingotière entraîne la mise en présence de deux surfaces solides, dont l'une est en mouvement par rapport à l'autre. Ces deux surfaces se trouvant par ailleurs à des températures élevées, quoique différentes, il se pose dans leur zone de contact de sérieux problèmes de frottement et par conséquent de lubrification.The beginning of solidification of the metal in the mold results in the presence of two solid surfaces, one of which is in motion relative to the other. These two surfaces being moreover at high temperatures, although different, there arises in their contact zone serious problems of friction and consequently of lubrication.

Il est de pratique courante d'assurer la lubrification d'une telle lingotière de coulée continue en déposant, sur la surface supérieure du métal coulé, une poudre contenant un agent lubrifiant approprié. La haute température qui règne dans la lingotière provoque la fusion de la poudre et le mouvement d'oscillation de la lingotière assure sa pénétration entre le métal coulé et la paroi interne de la lingotière. Il peut cependant arriver que l'agent lubrifiant perde partiellement ou totalement ses propriétés, et notamment sa fluidité avant d'atteindre la partie inférieure de la lingotière. Ce phénomène peut être dû, par exemple, à l'entraînement, par la poudre fondue, de particules telles que des inclusions d'alumine provenant du métal coulé. Ces particules généralement réfractaires ont pour effet de relever le point de fusion de la poudre; celle-ci se fige de façon irrégulière et la lubrification de la lingotière perd son caractère hydrodynamique.It is common practice to provide lubrication for such a continuous casting ingot mold by depositing, on the upper surface of the cast metal, a powder containing an appropriate lubricating agent. The high temperature prevailing in the mold causes the powder to melt and the oscillation movement of the mold ensures its penetration between the cast metal and the internal wall of the mold. However, it may happen that the lubricating agent partially or totally loses its properties, and in particular its fluidity before reaching the lower part of the mold. This phenomenon may be due, for example, to the entrainment, by the molten powder, of particles such as inclusions of alumina originating from the cast metal. These generally refractory particles have the effect of raising the melting point of the powder; it freezes irregularly and the lubrication of the mold loses its hydrodynamic character.

En outre, dans la zone inférieure de la lingotière, le métal coulé présente une peau solidifiée d'une épaisseur déjà importante, ce qui implique un refroidissement de cette peau par rapport au métal en fusion; il en résulte que la paroi de la lingotière, énergiquement refroidie, se trouve à une température nettement inférieure au point de fusion de la poudre. La face interne de cette paroi se couvre ainsi d'une couche de poudre solidifiée, qui se constitue au détriment du film d'agent lubrifiant et qui réduit par conséquent son efficacité.In addition, in the lower zone of the mold, the cast metal has a solidified skin of an already significant thickness, which implies cooling of this skin with respect to the molten metal; it follows that the wall of the mold, energetically cooled, is at a temperature much lower than the melting point of the powder. The internal face of this wall is thus covered with a layer of solidified powder, which is formed to the detriment of the film of lubricating agent and which consequently reduces its effectiveness.

. Dans l'état actuel de la technique, la lubrification de la zone inférieure d'une lingotière de coulée continue n'est donc pas toujours assurée de façon satisfaisante, ce qui peut cnstituer un sérieux inconvénient en ce qui concerne la qualité superficielle du métal coulé.. In the current state of the art, the lubrication of the lower zone of a continuous casting ingot mold is therefore not always ensured in a satisfactory manner, which can cause a serious drawback with regard to the surface quality of the cast metal. .

La présente invention a pour objet un procédé qui permet de remédier à cet inconvénient en assurant une lubrification complémentaire notamment dans la zone voisine du pied de la lingotière de coulée continue.The subject of the present invention is a method which makes it possible to remedy this drawback by ensuring additional lubrication, in particular in the region near the base of the mold for continuous casting.

Un procédé de ce type est connu par le EP-A 0 060 359, qui décrit un procédé de lubrification d'une lingotière de coulée continue dans lequel on ménage au moins un orifice de passage à travers la paroi de la lingotière et on introduit un agent lubrifiant par ledit orifice.A method of this type is known from EP-A 0 060 359, which describes a method of lubrication of a continuous casting ingot mold in which at least one passage orifice is formed through the wall of the ingot mold and a lubricating agent through said orifice.

Conformément à la présente invention, un procédé pour la lubrification d'une lingotière de coulée continue de métal, en particulier d'acier, dans lequel on ménage au moins un orifice de passage à travers la paroi de ladite lingotière et où l'on introduit un agent lubrifiant par ledit orifice, est caractérisé en ce que l'on introduit ledit agent lubrifiant sous la forme d'un barreau constitué d'une poudre ayant un point de fusion inférieur à la température du matériau se trouvant en face dudit orifice et en ce que l'on provoque la fusion dudit agent lubrifiant de telle façon qu'il se répande entre la paroi de ladite lingotière et le métal coulé dans ladite lingotière.In accordance with the present invention, a method for the lubrication of a mold for the continuous casting of metal, in particular steel, in which at least one orifice is formed through the wall of said mold and into which one introduces a lubricating agent through said orifice, is characterized in that said lubricating agent is introduced in the form of a rod made of a powder having a melting point below the temperature of the material located opposite said orifice and in which causes said lubricant to melt so that it spreads between the wall of said mold and the metal poured into said mold.

A cet égard, on rappelle que ce matériau peut être soit la peau déjà solidifiée du métal coulé, soit de la poudre figée sur la face interne de la paroi de la lingotière. Dans le premier cas, le barreau d'agent lubrifiant fond et lubrifie la lingotière. Dans le second cas, la fusion du barreau lubrifiant entraîne la fusion de la poudre figée, le mélange de deux poudres fondues et la reprise de la lubrification de la lingotière.In this regard, it is recalled that this material can either be the already solidified skin of the cast metal, or powder frozen on the internal face of the wall of the mold. In the first case, the bar of lubricating agent melts and lubricates the mold. In the second case, the melting of the lubricating bar leads to the melting of the frozen powder, the mixing of two molten powders and the resumption of lubrication of the ingot mold.

Selon une autre variante du procédé de l'invention, on soumet le dit agent lubrifiant à un préchauffage, et éventuellement à un début de fusion, pendant qu'il se trouve dans le dit orifice de passage à travers la paroi de la lingotière.According to another variant of the process of the invention, the said lubricant is subjected to preheating, and possibly to the start of melting, while it is in the said orifice for passage through the wall of the ingot mold.

A cet égard, il s'est avéré intéressant de réaliser ce préchauffage et/ou cette fusion par effet Joule.In this regard, it has proven to be advantageous to carry out this preheating and / or this fusion by the Joule effect.

La présente invention porte également sur un dispositif permettant de mettre en oeuvre le procédé qui vient d'être décrit.The present invention also relates to a device making it possible to implement the method which has just been described.

A cet effet, le dispositif de l'invention, comportant des moyens pour assurer l'interduction et la progression d'un agent lubrifiant à travers la paroi de ladite lingotière, est caractérisé en ce que ces moyens sont constitués par des orifices permettant le passage de l'agent lubrifiant sous la forme d'un barreau et en ce qu'il comporte en outre des moyens d'isolation thermique dudit agent lubrifiant par rapport au système de refroidissement de la lingotière.To this end, the device of the invention, comprising means for ensuring the interduction and the progression of a lubricating agent through the wall of said ingot mold, is characterized in that these means are constituted by orifices allowing the passage of the lubricating agent in the form of a bar and in that it also comprises means for thermal insulation of said lubricating agent with respect to the cooling system of the mold.

Au sens de la présente invention, il faut entendre par «paroi de la lingotière» l'ensemble des faces de cette lingotière. A cet égard, il va de soi qu'il ne sortirait pas du cadre de l'invention de prévoir, un ou éventuellement plusieurs orifices de passages par face, selon les dimensions de la lingotière, da façon à assurer la formation d'un film lubrifiant sur tout la surface de la lingotière.For the purposes of the present invention, the term "wall of the mold" should be understood to mean all of the faces of this mold. In this regard, it goes without saying that it would not be departing from the scope of the invention to provide one or possibly several orifices for passage per face, according to the dimensions of the mold, so as to ensure the formation of a film. lubricant over the entire surface of the mold.

Selon une caractéristique supplémentaire de l'invention, le dispositif est en outre équipé de moyens de chauffage et/ou de fusion du dit agent lubrifiant.According to an additional characteristic of the invention, the device is also equipped with means for heating and / or for melting said lubricating agent.

Selon l'invention, les dits moyens de chauffage et/ou de fusion consistent avantageusement en un circuit de chauffage par effet Joule.According to the invention, said heating means and / or fusion advantageously consist of a Joule effect heating circuit.

A titre purement illustratif, la figure jointe représente un dispositif conforme à l'invention, installé dans la zone inférieure d'une lingotière de coulée continue.By way of illustration only, the attached figure represents a device according to the invention, installed in the lower zone of a continuous casting mold.

La lingotière 1 est dotée d'un circuit de refroidissement par eau schématisé par les flèches 2 et 3, respectivement d'entrée et de sortie de l'eau. Dans deux parois opposées de la lingotière sont logés deux fours 4, pourvus d'orifices de passage 5 à travers lesquels des barreaux d'agent lubrifiant 6 peuvent pénétrer dans la lingotière. Ces fours sont pourvus d'un système de chauffage par effet Joule au moyen d'un courant électrique 1. Ils sont séparés de l'eau de refroidissement par les cloisons étanches 7; ils sont en outre garnis de matériau d'isolation thermique 8, afin d'éviter tout échauffement intempestif de l'eau de refroidissement de la lingotière 1. Lorsqu'un métal liquide, par exemple de l'acier en fusion est coulé dans cette lingotière, il se forme à la surface latérale du lingot 9 une peau solidifiée 10 dont l'épaisseur augmente dans le sens de progression du lingot. La poudre 11 déposée sur la surface supérieure du métal liquide fond et, par suite de l'oscillation de la lingotière, s'écoule entre les parois de la lingotière 1 et la peau 10 du lingot. On a représente ici un cas où le film 12 formé par cette poudre fondue perd son pouvoir lubrifiant dans la zone inférieure de la lingotière. Dans cette zone, les barreaux 6 fondus dans les fours 4 suppléent au manque de lubrifiant et forment à leur tour un film 13 qui assure une lubrification correcte jusqu'à la sortie de la lingotière.The ingot mold 1 is provided with a water cooling circuit shown diagrammatically by the arrows 2 and 3, respectively for entering and leaving the water. In two opposite walls of the mold are housed two ovens 4, provided with through holes 5 through which bars of lubricant 6 can enter the mold. These ovens are provided with a Joule effect heating system by means of an electric current 1. They are separated from the cooling water by the watertight partitions 7; they are also lined with thermal insulation material 8, in order to avoid any untimely heating of the cooling water of the ingot mold 1. When a liquid metal, for example molten steel is poured into this ingot mold , a solidified skin 10 is formed on the lateral surface of the ingot 9, the thickness of which increases in the direction of progression of the ingot. The powder 11 deposited on the upper surface of the molten metal melts and, as a result of the oscillation of the ingot mold, flows between the walls of the ingot mold 1 and the skin 10 of the ingot. We have here represented a case where the film 12 formed by this molten powder loses its lubricating power in the lower zone of the mold. In this zone, the bars 6 melted in the ovens 4 compensate for the lack of lubricant and in turn form a film 13 which ensures correct lubrication until the outlet of the mold.

L'invention porte enfin sur une lingotière de coulée continue de métal, en particulier d'acier, équipée de préférence dans chaque face, d'au moins un dispositif de lubrication tel qu'il vient d'être décrit.Finally, the invention relates to an ingot mold for continuous casting of metal, in particular steel, preferably equipped in each face with at least one lubrication device as just described.

Claims (7)

1. Process for lubricating an ingot mould for the continuous casting of a metal, particularly of steel, in which at least one access aperture is provided through the wall of the said ingot mould and in which a lubricant is introduced through the said aperture, characterized in that the said lubricant is introduced in the form of a bar (6) formed from a powder having a melting point lower than the temperature of the material (10, 13) which is located opposite the said aperture (5) and in that the said lubricant is caused to melt in such a way that it spreads between the wall of the said ingot mould (1) and the metal (9) cast in the said ingot mould (1).
2. Process according to Claim 1, characterized in that the said bar (6) of lubricant is subjected to preliminary heating while it is in the said access aperture (5) through the wall of the said ingot mould (1
3. Process according to either of Claims 1 and 2, characterized in that the said bar (6) of lubricant is subjected to incipient melting while it is in the said access aperture (5) through the wall of the said ingot mould (1).
4. Process according to either of Claims 2 and 3, characterized in that the said preliminary heating and /or the said incipient melting of the bar (6) is carried out using the Joule effect.
5. Device for implementing the process according to any one of Claims 1 to 4, comprising means (5,6) for ensuring the introduction and the advance of a lubricant through the wall of a continuous-casting ingot mould (1), characterized in that these means (5) comprise apertures which allow the lubricant, in the form of a bar (6) to pass through and in that it additionally comprises means (8) for thermally insulating the said lubricant (6) in relation to the cooling system (2, 3) of the ingot mould (1).
6. Device according to Claim 5, characterized in that it is additionally provided with means (4) for heating and/or melting the said lubricant (6).
7. Device according to Claim 6, characterized in that the said means (4) for heating and/or melting the said lubricant (6) comprise a heating circuit using the Joule effect (I).
EP85870056A 1984-04-27 1985-04-24 Method and apparatus for the lubrication of a continuous-casting mould Expired EP0160635B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE647961 1984-04-27
BE6/47961A BE899544A (en) 1984-04-27 1984-04-27 METHOD AND DEVICE FOR LUBRICATING A CONTINUOUS COLLEGE LINGOTIERE.

Publications (3)

Publication Number Publication Date
EP0160635A2 EP0160635A2 (en) 1985-11-06
EP0160635A3 EP0160635A3 (en) 1987-06-03
EP0160635B1 true EP0160635B1 (en) 1989-08-16

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EP85870056A Expired EP0160635B1 (en) 1984-04-27 1985-04-24 Method and apparatus for the lubrication of a continuous-casting mould

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US (1) US4917171A (en)
EP (1) EP0160635B1 (en)
JP (1) JPS60247447A (en)
AT (1) ATE45520T1 (en)
BE (1) BE899544A (en)
DE (1) DE3572315D1 (en)

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Publication number Priority date Publication date Assignee Title
US5271452A (en) * 1987-03-26 1993-12-21 Sms Concast Inc. Continuous casting method and apparatus
BE1000921A6 (en) * 1987-09-25 1989-05-16 Centre Rech Metallurgique Process for continuous casting of molten metal.
JPH0347659A (en) * 1989-07-14 1991-02-28 Sumitomo Metal Ind Ltd Mold lubricant for continuous casting
FR2672524B1 (en) * 1991-02-11 1993-05-28 Siderurgie Fse Inst Rech LINGOTIERE FOR CONTINUOUS CASTING OF METAL PRODUCTS.
FR2734186B1 (en) * 1995-05-17 1997-06-13 Unimetall Sa PROCESS FOR LUBRICATING THE WALLS OF A CONTINUOUS CASTING LINGOTIERE OF METALS AND LINGOTIERE FOR ITS IMPLEMENTATION
WO1998035775A1 (en) * 1997-02-17 1998-08-20 Nippon Steel Corporation Twin drum type sheet steel continuous casting device and continuous casting method therefor

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Publication number Priority date Publication date Assignee Title
DE742771C (en) * 1940-06-15 1943-12-10 Ver Deutsche Metallwerke Ag Device for lubricating the cast body in the continuous casting process
GB703269A (en) * 1950-11-21 1954-02-03 Norman Philip Goss Continuous casting of metal
US2747244A (en) * 1953-07-15 1956-05-29 Norman P Goss Porous mold for the continuous casting of metals
US2825947A (en) * 1955-10-14 1958-03-11 Norman P Goss Method of continuous casting of metal
GB1176139A (en) * 1966-05-06 1970-01-01 Ashmore Benson Pease & Company Continuous Casting
JPS5519428A (en) * 1978-07-28 1980-02-12 Sumitomo Metal Ind Ltd Lubricating method in casting mold of horizontal continuous casting method
US4369832A (en) * 1979-10-15 1983-01-25 Olin Corporation Continuous lubrication casting molds
JPS56165544A (en) * 1980-05-01 1981-12-19 Nippon Steel Corp Method for continuous casting of steel
JPS5758960A (en) * 1980-09-27 1982-04-09 Kawasaki Steel Corp Continuous casting method for board thin-walled ingon
EP0060359A1 (en) * 1981-03-16 1982-09-22 Olin Corporation Improved continuous lubrication casting molds

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Publication number Publication date
BE899544A (en) 1984-08-16
EP0160635A2 (en) 1985-11-06
EP0160635A3 (en) 1987-06-03
US4917171A (en) 1990-04-17
JPS60247447A (en) 1985-12-07
ATE45520T1 (en) 1989-09-15
DE3572315D1 (en) 1989-09-21

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