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EP1358029B1 - Method and device for refractory dressing of rolls of a metal strip continuous casting machine - Google Patents

Method and device for refractory dressing of rolls of a metal strip continuous casting machine Download PDF

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Publication number
EP1358029B1
EP1358029B1 EP02703655A EP02703655A EP1358029B1 EP 1358029 B1 EP1358029 B1 EP 1358029B1 EP 02703655 A EP02703655 A EP 02703655A EP 02703655 A EP02703655 A EP 02703655A EP 1358029 B1 EP1358029 B1 EP 1358029B1
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EP
European Patent Office
Prior art keywords
coating
process according
adjustment
composition
rolls
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
EP02703655A
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German (de)
French (fr)
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EP1358029A1 (en
Inventor
Pierre-Yves Menet
Patrick Golestin
Jean-Luc Stoecklin
Frédéric BASSON
Klaus Maiwald
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.)
Novelis Inc Canada
Original Assignee
Pechiney Rhenalu SAS
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Publication date
Application filed by Pechiney Rhenalu SAS filed Critical Pechiney Rhenalu SAS
Publication of EP1358029A1 publication Critical patent/EP1358029A1/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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating

Definitions

  • the invention relates to continuous casting between cylinders of metal strips, especially aluminum or aluminum alloy strips. It concerns everything particularly a method and a device for poteying said cylinders during casting.
  • Continuous casting between cylinders is a well known technique for producing metal strips from a source of liquid metal.
  • metal liquid is injected into the air gap separating two rotating metal cylinders, solidifies on contact with them and leaves in solid state, in the form of a strip.
  • Known poteyage devices include one or more means of projection by cylinder which can be fixed or mobile.
  • French applications FR 2 498 099 (corresponding to American patent US 4 501 315) and FR 2 621 839 (corresponding to American patent US 4 892 133) describe adjustable flow rate cleaning devices including distribution ramps of poteyage product provided with projection means arranged linearly the along the cylinders.
  • the Applicant has therefore sought solutions to improve the treatment of cylinders for continuous casting machines of metal strips.
  • the subject of the invention is a method for poteying the cylinders of a continuous casting between cylinders in which at least one product of poteyage containing a poteyage agent, such as a graphite suspension, which is characterized in that it comprises an adjustment of the composition of said product of coating during application on said cylinders.
  • a poteyage agent such as a graphite suspension
  • the invention also relates to a continuous casting process between cylinders of metal bands comprising a coating process according to the invention.
  • the invention also relates to a device for poteying the cylinders which is suitable for use on a continuous casting machine between rolls, which comprises means for applying at least one coating product and which is characterized by what it includes means for adjusting the composition of said poteyage product being applied to said cylinders.
  • the invention also relates to a continuous casting machine between cylinders of metal strips equipped with a coating device according to the invention.
  • the invention also relates to a method of regulating a machine for continuous casting between cylinders of metal strips comprising the application of minus a coating product on said cylinders, said coating product containing a coating agent, such as graphite, which is characterized in that it includes an adjustment of the composition of said current coating product of application on said cylinders. Said adjustment is advantageously carried out in depending on the operating conditions of said machine.
  • Said continuous casting may be horizontal, inclined with respect to the horizontal or vertical (ascending or descending).
  • the poteyage product can be a suspension, solution or mixture thereof.
  • Figure 1 shows schematically, side view, a casting machine continuous between cylinders provided with poteyage means typical of the prior art.
  • Figure 2 is a schematic representation of a poteyage device of a continuous casting machine between cylinders of the prior art.
  • Figure 3 is a schematic representation of a preferred embodiment of a poteyage device of a continuous casting machine between cylinders according to the invention.
  • FIG. 4 schematically represents variants of part of the device for poteying of a continuous casting machine between cylinders according to the invention.
  • Figure 5 illustrates the influence of a variation in the spray of projection means juxtaposed on the distribution of poteyage product on the surface of a cylinder.
  • Figure 6 illustrates the influence of a variation of the spray of projection means juxtaposed on the distribution of poteyage product on the surface of a cylinder in the event of a strong overlap between the jets.
  • Figure 7 shows schematically, side view, a casting machine continuous between cylinders provided with poteyage means according to one embodiment possible of the invention.
  • FIG. 8 is a simplified representation, seen from above, of a casting machine continuous between cylinders provided with poteyage means according to one embodiment possible of the invention.
  • Figure 9 is a simplified representation, seen from above, of a casting machine continuous between cylinders provided with poteyage means according to one embodiment possible of the invention.
  • a machine (1) for continuous casting between cylinders typically comprises two horizontal cylinders (1A, 1B) and an injector (2).
  • the cylinders (1A, 1B) are typically made of metal and generally have the same diameter.
  • the axes of rotation (A, B) of the cylinders (1A, 1B) are generally substantially parallel to each other.
  • the cylinders are separated by an air gap (13) and are able to rotate in opposite directions with respect to each other.
  • the liquid metal (3) is introduced on one side of the air gap (13) using the injector (2) and leaves the other side in the solid state, in the form of a strip (4) having a nominal thickness Eo which is substantially equal to the opening E of the air gap (13).
  • the surface (10) of the cylinders is continuously cooled, typically using a coolant circulating inside the cylinders.
  • the casting is said to be horizontal when the center distance A-B between the cylinders (1A) and (1B) is substantially vertical. It is said to be inclined when said center distance A-B is inclined with respect to the vertical. It is said to be vertical when said center distance A-B is substantially horizontal.
  • a continuous casting machine between cylinders is normally provided with means poteyage typically comprising projection means (5) of the product of poteyage (24), support means (7, 8) of said projection means, a source (22) of cleaning product (24), an agitator (23), tubes (6, 21) for conveying the cleaning product (24) and a means (20) for regulating the flow of the poteyage product.
  • the source (22) of poteyage product is typically a tank with a capacity of the order of 100 to 200 liters.
  • the method for poteying the cylinders (1A, 1B) of a machine (1) of continuous casting between cylinders comprises the application of at least one product of poteyage (24) on said cylinders, said poteyage product containing a poteyage and a carrier fluid, and is characterized in that it comprises an adjustment of the composition of said poteyage product (24) being applied to said cylinders.
  • the invention is based on the idea of varying the composition of the coating product so as to avoid variations in the size of the jets and the distribution of the coating agent to inside the projection cone or "jets" (9, 91, 92) and on the impact surface (100, 101, 102) which may appear when the flow rate of the means of variation is varied projection (5, 51, 52).
  • the coating agent preferably comprises graphite, typically in the form of micron particles.
  • the carrier fluid preferably comprises water.
  • the graphite is suspended in the carrier fluid, possibly in the form colloidal, with a concentration which is typically between 0.2 and 4% by weight.
  • said adjustment of the composition involves an adjustment of the proportion of cleaning agent contained in the product poteyage, that is to say the concentration of poteyage agent of said product die coating.
  • the adjustment of the composition involves a dilution of a concentrate of potting agent in a carrier fluid.
  • Said concentrate can be a "Mother suspension” means a concentrated solution or a mixture thereof.
  • said concentrate is advantageously chosen from concentrated graphite suspensions, boron nitride, colloidal silica, magnesia, organic products (such as organic oils or polyesters) or a mixture thereof.
  • a mother suspension which is a concentrate of graphite particles in suspension in a gel, with a proportion of graphite typically between 20 and 30% by weight.
  • the carrier fluid is then generally water.
  • the proportion of mother suspension added to the carrier fluid is typically between 1 and 8%.
  • the method according to the invention may include also an adjustment of the flow rate of the product so as to obtain a jet stability over time, especially between the time the guns are adjusted with respect to the cylinders, outside casting, and during casting.
  • the adjustment of the composition can be made retroactively according to measurements made on the casting machine (1) (typically using a loop regulation) and / or automatically. These measures include typically measurements chosen from optical, laser, infrared, vibrations or mechanical tension.
  • the amount of potting agent present on the surface (10) of the cylinders can be determined using a detector (such as an optical detector, a laser system, a camera or a detector infrared) which produces a signal which can be used in feedback to regulate the composition of poteyage product. Said adjustment of the composition can then correspond to a regulation.
  • the process of the invention can be included in a process for regulating a continuous casting machine between cylinders.
  • the device for poteying a cylinder (1A, 1B), which is capable of being used on a continuous casting machine between rolls, includes means coating (5, 51, 52, 6, 61, 62, 7, 8, 20, 21) to apply at least one poteyage (24) on said cylinders and is characterized in that it comprises means (30 to 41) to adjust the composition of the coating product during application on said cylinders.
  • the poteyage device according to the invention is capable of implementing the method of poteyage of the invention.
  • the coating means advantageously comprise means (20) for control the flow of the projection means (5, 51, 52), such as a pump volumetric.
  • the conduits (6, 21) can be made of different materials compatible with the product and the ambient conditions of a continuous casting machine.
  • a part (6) of the conduits is preferably flexible.
  • the coating means can be placed in different places on the periphery cylinders. They are however advantageously placed on the outlet side, that is to say on the side of the metal strip, so as not to be in contact with the metal liquid, which could lead to the risk of explosion.
  • the means of dressing according to the invention can also include means (38, 39), active or passive, such as an agitator (38) or a baffle (39), to homogenize the poteyage product.
  • the poteyage means according to the invention can optionally include means (38) for maintaining in suspension the potting agent particles.
  • said means for adjusting (30 to 41) the composition of the poteyage product include a mixer (40), a supply of poting agent (41), a regulating means (32) for the supply of potetting agent and a supply in carrier fluid (30).
  • the regulating means (32) makes it possible to control and regulate the quantity of potting agent which is supplied to the mixer (40) and applied to the cylinders by the coating means.
  • the regulating means (32) can include, for example, a metering pump.
  • Said mixer (40) can also be a Venturi, a buffer tank or a pot.
  • the mixer (40) is advantageously of very low capacity (for example from 1 to 2 liters), which in particular makes it possible to rapidly vary the concentration of agent of poteyage contained in the product of poteyage.
  • the mixer (40) can be common to several projection means.
  • FIG. 4 illustrates two embodiments of said adjustment means (30 to 41).
  • said adjustment means (30 to 41) comprise a reservoir (34) capable of containing said concentrate (35), a means of regulation (32) of the supply of potetting agent, of the means of pipelines (31, 33), a supply of carrier fluid (30), a buffer tank (36) capable of contain the cleaning product (24), a mixing zone (37) and an agitator (38).
  • a reservoir (34) capable of containing said concentrate (35)
  • a means of regulation (32) of the supply of potetting agent of the means of pipelines (31, 33)
  • a supply of carrier fluid (30
  • a buffer tank (36) capable of contain the cleaning product (24)
  • mixing zone capable of contain the cleaning product (24
  • an agitator 38
  • said adjustment means (30 to 41) comprise a reservoir (34) capable of containing said concentrate (35), a means of regulation (32) of the supply of potetting agent, of the means of pipelines (31, 33), a supply of carrier fluid (30), a pot (36) capable of containing the potage product (24), a mixing zone (37), baffles (39) and an agitator (38).
  • the Applicant came up with the idea that the dilution of a concentrate of potting agent in a carrier fluid in a mixer (40), especially when the latter is low capacity, could avoid sedimentation problems of the poteyage which are often observed with known devices (which operate in generally in "batch” mode using large capacity tanks (22), at its see typically between 100 and 200 liters) and which cause fluctuations in the effective composition of the potage product compared to the nominal value.
  • the use of one or more mixers (40) of low capacity also allows to reduce their volume and, consequently, the size of the casting installations. She also simplifies orders.
  • the supply of coating agent (41) comprises advantageously a reservoir (34), from which it is possible to supply, so regulated, the mixer (40).
  • the means (30 to 41), for adjusting the composition of the coating product can forming an adjustment device (42) which is advantageously separate, removable and / or removable, which facilitates maintenance.
  • the poteyage device of the invention may include means for controlling retroactively said adjustment of the composition as a function of measurements carried out on said casting machine, for example using a regulation loop. he can also include means for automatically controlling said composition adjustment.
  • the projection means (5, 51, 52) are typically chosen from the group including nozzles and guns.
  • the coating means may include a only one projection means (5) per cylinder (figure 1) or several means of projection (51, 52) by cylinder ( Figures 7 and 9). In the latter case, the means of projection can be superimposed (as illustrated in figure 7) or distributed along the cylinder (as shown in Figure 9).
  • the coating means can also include means for moving the projection means along the cylinder, typically in a swinging or reciprocating motion between one end (11) and the other (12) of the cylinder.
  • said coating means comprise a projection means (5) for each cylinder (1A, 1B) and means (80 to 84) for moving said projection means (5) along each cylinder, typically in a reciprocating motion.
  • said coating means comprise at least two projection means (51, 52) for each cylinder (1A, 1B), said projection means forming an integral assembly, and means (80 to 84) to move each said together along each cylinder, typically back and forth.
  • the means of projection of each said set are advantageously superimposed, as illustrated in Figure 7, when trying to produce wide strips (which is normally made difficult by the limited maximum speed of the displacement means of the projection means).
  • the displacement means (80 to 84) typically comprise a mobile support or carriage (80), a rail (81) and drive means (82, 83, 84) such as a engine.
  • said displacement means (80 to 84) make it possible to moving said projection means in a back and forth movement along a axis parallel to the axis (A, B) of the cylinder.
  • said coating means comprise at least two projection means (5) for each cylinder and said projection means are arranged on a line substantially parallel to the axis (A, B) of each said cylinder (1A, 1B).
  • the projection means are typically equidistant.
  • the orientation of the projection means can be fixed or variable.
  • the device according to the invention may also include means for oscillating at least one of the projection means with respect to a determined axis, which makes it possible to increase the impact surface of the projection means and, possibly, to decrease the number.
  • the axis of oscillation is typically vertical.
  • the invention is particularly advantageous in the case where at least two are used projection means per cylinder. Indeed, in such cases, the recovery of projection cones (9, 91, 92) and impact surfaces (100, 101, 102) can lead to large variations in the distribution of the total surface-active agent multiple. projection means. For example, as shown schematically in the Figure 5, where D represents the surface density of the coating agent, the surface of total impact of two juxtaposed projection means can undergo not only radial variations in density, as is the case with only one means of projection, but also very significant variations in density in the area of contact between the projection cones and the impact surfaces, even if the coating may be close to the nominal value N in areas S where impact surfaces do not not overlap.
  • Figure 5a corresponds to the case where the two jets form an angle relatively closed compared to the desired optimal value; the overlap between the projection cones and the two impact surfaces is in this case very small or zero, which leads to underpotting areas E compared to the nominal value N.
  • Figure 5b) corresponds to the case where the two jets form a relatively angle open to the desired optimal value; the overlap between the cones of projection and the two impact surfaces is in this case not negligible, even important, which leads to areas of over-poteyage R compared to the value nominal N.
  • Figure 6 shows that a similar effect can occur even if the overlap areas between the impact surfaces are very important.
  • the amount of poteyage applied in certain areas can fluctuate by very importantly, going from underpotting in certain T zones when the angle of the jets is relatively closed compared to the desired optimal value (Figure 6a) to overpotting in the same areas T when the angle of the jets is relatively open ( Figure 6b).
  • the machine (1) for continuous casting between cylinders according to the invention can comprise at least one detector to determine the quantity of potting agent present in surface (10) of the cylinders which produces a signal suitable for being used in feedback for adjust the composition of the product.
  • Said detector is typically chosen from optical detectors, laser systems, cameras, detectors infrared, vibration detectors and mechanical tension detectors.
  • said adjustment can be made by depending on the operating conditions of said machine (1). He can also be performed retroactively based on measurements made on said machine casting, for example using a control loop. These measures may include measurements chosen from optical, laser, infrared, vibrations or mechanical tension. Said adjustment of the composition can also be done automatically.
  • the invention relates above all to the production of strips of non-ferrous metals, especially aluminum or aluminum alloy or copper or alloy copper.
  • the invention which can be integrated into continuous casting methods and devices between existing cylinders, improves the quality of the bands obtained and the consistency of the poteyage deposit on the cylinders. Quality is especially improved by the adjustment of the jets which can remain the same whatever the field of machine operation. For a given operating regime, the consistency of the deposit makes it possible to significantly limit the amount of poteyage product necessary to obtain bands of determined quality.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Continuous Casting (AREA)
  • Lubricants (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Casting Devices For Molds (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention concerns a method for refractory dressing of rolls of a machine for continuous casting between rolls which consists in applying a mould dressing product containing a mould dressing agent, such as graphite, and in adjusting the mould dressing product composition while it is being applied on the rolls. The invention also concerns a device for refractory dressing of rolls of a machine for continuous casting between rolls comprising means for applying a mould dressing product and means for adjusting the composition of the mould dressing product while it is being applied on the rolls. The invention enables to control the amount and the distribution of the mould dressing product on the surface of the rolls.

Description

Domaine de l'inventionField of the invention

L'invention concerne la coulée continue entre cylindres de bandes métalliques, notamment de bandes en aluminium ou en alliage d'aluminium. Elle concerne tout particulièrement un procédé et un dispositif de poteyage desdits cylindres en cours de coulée.The invention relates to continuous casting between cylinders of metal strips, especially aluminum or aluminum alloy strips. It concerns everything particularly a method and a device for poteying said cylinders during casting.

Etat de la techniqueState of the art

La coulée continue entre cylindres est une technique bien connue pour produire des bandes métalliques à partir d'une source de métal liquide. Typiquement, du métal liquide est injecté dans l'entrefer séparant deux cylindres métalliques en rotation, se solidifie au contact de ceux-ci et sort à l'état solide, sous forme de bande.Continuous casting between cylinders is a well known technique for producing metal strips from a source of liquid metal. Typically, metal liquid is injected into the air gap separating two rotating metal cylinders, solidifies on contact with them and leaves in solid state, in the form of a strip.

En général, en l'absence de précautions particulières, le métal solidifié adhère partiellement à la surface des cylindres, ce qui conduit à une détérioration de la qualité de la bande, voire à l'arrêt de la coulée. Afin d'éviter ce phénomène dit « de collage », qui est d'autant plus marqué que la productivité de l'installation est élevée, il est connu de poteyer la surface de travail des cylindres par projection d'un produit de poteyage liquide (également appelé « lubrifiant ») à l'aide de buses ou de pistolets. Le produit de poteyage est souvent un mélange d'eau et de particules de graphite. Le poteyage est normalement appliqué en continu, c'est-à-dire qu'on enduit de manière sensiblement continue la surface de travail d'un cylindre avec le produit de poteyage.In general, in the absence of special precautions, the solidified metal adheres partially on the surface of the cylinders, which leads to deterioration of the quality of the strip, or even when the casting is stopped. In order to avoid this phenomenon known as " bonding ", which is all the more marked when the productivity of the installation is high, it is known to poteyer the working surface of cylinders by spraying a product liquid coating (also called "lubricant") using nozzles or guns. The poteyage product is often a mixture of water and particles of graphite. The coating is normally applied continuously, i.e. it is coated substantially continuously the working surface of a cylinder with the product poteyage.

Les dispositifs de poteyage connus comprennent un ou plusieurs moyens de projection par cylindre qui peuvent être fixes ou mobiles. Known poteyage devices include one or more means of projection by cylinder which can be fixed or mobile.

Les demandes françaises FR 2 498 099 (correspondant au brevet américain US 4 501 315) et FR 2 621 839 (correspondant au brevet américain US 4 892 133) décrivent des dispositifs de poteyage à débit ajustable comprenant des rampes de distribution du produit de poteyage munies de moyens de projection disposés linéairement le long des cylindres.French applications FR 2 498 099 (corresponding to American patent US 4 501 315) and FR 2 621 839 (corresponding to American patent US 4 892 133) describe adjustable flow rate cleaning devices including distribution ramps of poteyage product provided with projection means arranged linearly the along the cylinders.

La demande de brevet internationale WO 95/09707 (sur lequel est basé le préambule des revendications décrit un dispositif de poteyage munie de buses de pulvérisation du produit de poteyage alignées le long des cylindres et regroupées par zones, chaque zone étant alimentée séparément en produit de poteyage en fonction de la largeur de la bande métallique. Une partie des buses peut être entraínée dans un mouvement oscillatoire parallèle à l'axe des cylindres.International patent application WO 95/09707 (on which the preamble of claims is based describes a poteyage device fitted with spraying nozzles for poteye product aligned along the cylinders and grouped by zones, each zone being supplied separately with poteyage product depending on the width of the metal strip. Part of nozzles can be driven in an oscillatory movement parallel to the axis of cylinders.

Problème poséProblem

Dans le cadre de ses efforts continus de développement des machines et procédés de coulée continue entre cylindres de bandes métalliques, la demanderesse a fait le constat que les procédés et dispositifs de poteyage connus ne permettaient pas d'éviter les phénomènes de collage dans toutes les conditions de production industrielle de bandes métalliques.As part of its ongoing efforts to develop machinery and continuous casting between cylinders of metal strips, the applicant has made the finding that known poteyage processes and devices did not allow avoid sticking phenomena in all production conditions industrial metal strips.

La demanderesse a donc recherché des solutions pour améliorer le poteyage des cylindres de machines de coulée continue de bandes métalliques.The Applicant has therefore sought solutions to improve the treatment of cylinders for continuous casting machines of metal strips.

Description de l'inventionDescription of the invention

L'invention a pour objet un procédé de poteyage des cylindres d'une machine de coulée continue entre cylindres dans lequel on applique au moins un produit de poteyage contenant un agent de poteyage, tel qu'une suspension de graphite, qui est caractérisé en ce qu'il comprend un ajustement de la composition dudit produit de poteyage en cours d'application sur lesdits cylindres. The subject of the invention is a method for poteying the cylinders of a continuous casting between cylinders in which at least one product of poteyage containing a poteyage agent, such as a graphite suspension, which is characterized in that it comprises an adjustment of the composition of said product of coating during application on said cylinders.

L'invention a également pour objet un procédé de coulée continue entre cylindres de bandes métalliques comprenant un procédé de poteyage selon l'invention.The invention also relates to a continuous casting process between cylinders of metal bands comprising a coating process according to the invention.

L'invention a également pour objet un dispositif de poteyage des cylindre qui est apte à être utilisé sur une machine de coulée continue entre cylindres, qui comprend des moyens pour appliquer au moins un produit de poteyage et qui est caractérisé en ce qu'il comprend des moyens pour ajuster la composition dudit produit de poteyage en cours d'application sur lesdits cylindres.The invention also relates to a device for poteying the cylinders which is suitable for use on a continuous casting machine between rolls, which comprises means for applying at least one coating product and which is characterized by what it includes means for adjusting the composition of said poteyage product being applied to said cylinders.

L'invention a également pour objet une machine de coulée continue entre cylindres de bandes métalliques équipée d'un dispositif de poteyage selon l'invention.The invention also relates to a continuous casting machine between cylinders of metal strips equipped with a coating device according to the invention.

L'invention a également pour objet un procédé de régulation d'une machine de coulée continue entre cylindres de bandes métalliques comprenant l'application d'au moins un produit de poteyage sur lesdits cylindres, ledit produit de poteyage contenant un agent de poteyage, tel que du graphite, qui est caractérisé en ce qu'il comprend un ajustement de la composition dudit produit de poteyage en cours d'application sur lesdits cylindres. Ledit ajustement est avantageusement effectué en fonction des conditions de fonctionnement de ladite machine.The invention also relates to a method of regulating a machine for continuous casting between cylinders of metal strips comprising the application of minus a coating product on said cylinders, said coating product containing a coating agent, such as graphite, which is characterized in that it includes an adjustment of the composition of said current coating product of application on said cylinders. Said adjustment is advantageously carried out in depending on the operating conditions of said machine.

Ladite coulée continue peut être horizontale, inclinée par rapport à l'horizontale ou verticale (ascendante ou descendante).Said continuous casting may be horizontal, inclined with respect to the horizontal or vertical (ascending or descending).

Afin d'obtenir une efficacité de poteyage optimale, la demanderesse à cherché à contrôler la quantité et la répartition du produit de poteyage qui est déposée sur la surface de travail des cylindres. Or, elle a constaté au cours de ses essais que, contrairement à ce qui est normalement admis, les changements du débit des moyens de projection modifiaient non seulement la quantité de produit de poteyage déposée sur les cylindres mais également la répartition dudit produit sur leur surface de travail, avec pour conséquence, en particulier, des variations incontrôlées de l'efficacité du poteyage, notamment en ce qui a trait à la stabilité de la machine de coulée et à la qualité de la bande produite. Elle a en particulier remarqué que les variations de débit du produit de poteyage projeté sur la surface de travail d'un cylindre par un moyen de projection peut produire des variations de la répartition de l'agent de poteyage à l'intérieur du cône de projection ou « jets » et sur la surface d'impact, alors que, en général, les variations de la composition du produit de poteyage ne modifient pas ladite répartition de manière significative.In order to obtain optimum poteyage efficiency, the applicant sought to control the quantity and distribution of the coating product which is deposited on the cylinder working surface. However, it noted during its tests that, contrary to what is normally admitted, changes in the flow of means spray not only changed the amount of coating product deposited on the cylinders but also the distribution of said product on their surface of work, with the consequence, in particular, of uncontrolled variations in the effectiveness of the coating, in particular with regard to the stability of the casting and the quality of the tape produced. In particular, she noted that variations in the flow rate of the spraying product sprayed onto the work surface of a cylinder by projection means can produce variations in the distribution of the potting agent inside the spray cone or “jets” and on the surface impact, whereas, in general, variations in the composition of the product of poteyage do not significantly alter said distribution.

Pour résoudre le problème posé à l'invention, la demanderesse a eu l'idée d'ajuster la composition du produit de poteyage en cours d'application, ce qui permet d'ajuster la quantité d'agent de poteyage apportée à la surface du cylindre tout en limitant les hétérogénéités de répartition dudit agent. Le produit de poteyage peut être une suspension, une solution ou un mélange de ceux-ci.To resolve the problem posed to the invention, the applicant had the idea of adjusting the composition of the coating product during application, which makes it possible to adjust the amount of potentage agent brought to the surface of the cylinder while limiting the distribution heterogeneities of said agent. The poteyage product can be a suspension, solution or mixture thereof.

L'invention sera mieux comprise à l'aide des figures et de la description détaillée qui suivent.The invention will be better understood using the figures and the detailed description which follow.

La figure 1 représente schématiquement, vue de côté, une machine de coulée continue entre cylindres munie de moyens de poteyage typique de l'art antérieur.Figure 1 shows schematically, side view, a casting machine continuous between cylinders provided with poteyage means typical of the prior art.

La figure 2 est une représentation schématique d'un dispositif de poteyage d'une machine de coulée continue entre cylindres de l'art antérieur.Figure 2 is a schematic representation of a poteyage device of a continuous casting machine between cylinders of the prior art.

La figure 3 est une représentation schématique d'un mode de réalisation préféré d'un dispositif de poteyage d'une machine de coulée continue entre cylindres selon l'invention.Figure 3 is a schematic representation of a preferred embodiment of a poteyage device of a continuous casting machine between cylinders according to the invention.

La figure 4 représente schématiquement des variantes d'une partie du dispositif de poteyage d'une machine de coulée continue entre cylindres selon l'invention.FIG. 4 schematically represents variants of part of the device for poteying of a continuous casting machine between cylinders according to the invention.

La figure 5 illustre l'influence d'une variation du jet de produit de poteyage de moyens de projection juxtaposés sur la répartition de produit de poteyage sur la surface d'un cylindre. Figure 5 illustrates the influence of a variation in the spray of projection means juxtaposed on the distribution of poteyage product on the surface of a cylinder.

La figure 6 illustre l'influence d'une variation du jet de produit de poteyage de moyens de projection juxtaposés sur la répartition de produit de poteyage sur la surface d'un cylindre dans le cas d'un fort recouvrement entre les jets.Figure 6 illustrates the influence of a variation of the spray of projection means juxtaposed on the distribution of poteyage product on the surface of a cylinder in the event of a strong overlap between the jets.

La figure 7 représente schématiquement, vue de côté, une machine de coulée continue entre cylindres munie de moyens de poteyage selon un mode de réalisation possible de l'invention.Figure 7 shows schematically, side view, a casting machine continuous between cylinders provided with poteyage means according to one embodiment possible of the invention.

La figure 8 est une représentation simplifiée, vue du dessus, d'une machine de coulée continue entre cylindres munie de moyens de poteyage selon un mode de réalisation possible de l'invention.FIG. 8 is a simplified representation, seen from above, of a casting machine continuous between cylinders provided with poteyage means according to one embodiment possible of the invention.

La figure 9 est une représentation simplifiée, vue du dessus, d'une machine de coulée continue entre cylindres munie de moyens de poteyage selon un mode de réalisation possible de l'invention.Figure 9 is a simplified representation, seen from above, of a casting machine continuous between cylinders provided with poteyage means according to one embodiment possible of the invention.

Description détaillée de l'inventionDetailed description of the invention

Tel qu'illustré à la figure 1, une machine (1) de coulée continue entre cylindres comprend typiquement deux cylindres horizontaux (1A, 1B) et un injecteur (2). Les cylindres (1A, 1B) sont typiquement en métal et possèdent généralement le même diamètre. Les axes de rotation (A, B) des cylindres (1A, 1B) sont en général sensiblement parallèles l'un à l'autre. Les cylindres sont séparés par un entrefer (13) et sont aptes à tourner en sens inverse l'un par rapport à l'autre.As illustrated in FIG. 1, a machine (1) for continuous casting between cylinders typically comprises two horizontal cylinders (1A, 1B) and an injector (2). The cylinders (1A, 1B) are typically made of metal and generally have the same diameter. The axes of rotation (A, B) of the cylinders (1A, 1B) are generally substantially parallel to each other. The cylinders are separated by an air gap (13) and are able to rotate in opposite directions with respect to each other.

Le métal liquide (3) est introduit d'un côté de l'entrefer (13) à l'aide de l'injecteur (2) et sort de l'autre côté à l'état solide, sous la forme d'une bande (4) ayant une épaisseur nominale Eo qui est sensiblement égale à l'ouverture E de l'entrefer (13). La surface (10) des cylindres est refroidie de manière continue, typiquement à l'aide d'un fluide de refroidissement circulant à l'intérieur des cylindres. The liquid metal (3) is introduced on one side of the air gap (13) using the injector (2) and leaves the other side in the solid state, in the form of a strip (4) having a nominal thickness Eo which is substantially equal to the opening E of the air gap (13). The surface (10) of the cylinders is continuously cooled, typically using a coolant circulating inside the cylinders.

La coulée est dite horizontale lorsque l'entraxe A-B entre les cylindres (1A) et (1B) est sensiblement vertical. Elle est dite inclinée lorsque ledit entraxe A-B est incliné par rapport à la verticale. Elle est dite verticale lorsque ledit entraxe A-B est sensiblement horizontal.The casting is said to be horizontal when the center distance A-B between the cylinders (1A) and (1B) is substantially vertical. It is said to be inclined when said center distance A-B is inclined with respect to the vertical. It is said to be vertical when said center distance A-B is substantially horizontal.

Une machine de coulée continue entre cylindres est normalement munie de moyens de poteyage comprenant typiquement des moyens de projection (5) du produit de poteyage (24), des moyens de support (7, 8) desdits moyens de projection, une source (22) de produit de poteyage (24), un agitateur (23), des tubulures (6, 21) pour acheminer le produit de poteyage (24) et un moyen (20) pour réguler le débit du produit de poteyage. La source (22) de produit de poteyage est typiquement un réservoir d'une capacité de l'ordre de 100 à 200 litres.A continuous casting machine between cylinders is normally provided with means poteyage typically comprising projection means (5) of the product of poteyage (24), support means (7, 8) of said projection means, a source (22) of cleaning product (24), an agitator (23), tubes (6, 21) for conveying the cleaning product (24) and a means (20) for regulating the flow of the poteyage product. The source (22) of poteyage product is typically a tank with a capacity of the order of 100 to 200 liters.

Selon l'invention, le procédé de poteyage des cylindres (1A, 1B) d'une machine (1) de coulée continue entre cylindres comprend l'application d'au moins un produit de poteyage (24) sur lesdits cylindres, ledit produit de poteyage contenant un agent de poteyage et un fluide porteur, et est caractérisé en ce qu'il comprend un ajustement de la composition dudit produit de poteyage (24) en cours d'application sur lesdits cylindres.According to the invention, the method for poteying the cylinders (1A, 1B) of a machine (1) of continuous casting between cylinders comprises the application of at least one product of poteyage (24) on said cylinders, said poteyage product containing a poteyage and a carrier fluid, and is characterized in that it comprises an adjustment of the composition of said poteyage product (24) being applied to said cylinders.

L'invention repose sur l'idée de varier la composition du produit de poteyage afin d'éviter les variations de la taille des jets et de la répartition de l'agent de poteyage à l'intérieur du cône de projection ou « jets » (9, 91, 92) et sur la surface d'impact (100, 101, 102) qui peuvent apparaítre lorsqu'on varie le débit des moyens de projection (5, 51, 52).The invention is based on the idea of varying the composition of the coating product so as to avoid variations in the size of the jets and the distribution of the coating agent to inside the projection cone or "jets" (9, 91, 92) and on the impact surface (100, 101, 102) which may appear when the flow rate of the means of variation is varied projection (5, 51, 52).

L'agent de poteyage comprend de préférence du graphite, typiquement sous forme de particules microniques. Le fluide porteur comprend de préférence de l'eau. Le graphite est en suspension dans le fluide porteur, éventuellement sous forme colloïdale, avec une concentration qui se situe typiquement entre 0,2 et 4 % en poids. The coating agent preferably comprises graphite, typically in the form of micron particles. The carrier fluid preferably comprises water. The graphite is suspended in the carrier fluid, possibly in the form colloidal, with a concentration which is typically between 0.2 and 4% by weight.

Dans le mode de réalisation préféré de l'invention, ledit ajustement de la composition comporte un ajustement de la proportion d'agent de poteyage contenu dans le produit de poteyage, c'est-à-dire de la concentration en agent de poteyage dudit produit de poteyage. Ainsi, il est possible de modifier la quantité d'agent de poteyage projeté sur le cylindre en modifiant la proportion d'agent de poteyage dans le produit de poteyage, sans modifier le débit des moyens de projection: on augmente la proportion d'agent de poteyage lorsqu'on veut projeter une plus grande quantité d'agent de poteyage sur la surface (10) du cylindre et on la diminue dans le cas inverse.In the preferred embodiment of the invention, said adjustment of the composition involves an adjustment of the proportion of cleaning agent contained in the product poteyage, that is to say the concentration of poteyage agent of said product die coating. Thus, it is possible to modify the quantity of spraying agent on the cylinder by modifying the proportion of cleaning agent in the product of poteyage, without modifying the flow rate of the projection means: the proportion of cleaning agent when we want to spray a larger quantity of coating agent on the surface (10) of the cylinder and it is reduced in the case reverse.

De préférence, l'ajustement de la composition comporte une dilution d'un concentré d'agent de poteyage dans un fluide porteur. Ledit concentré peut être une « suspension mère », une solution concentrée ou un mélange de ceux-ci. Ledit concentré est avantageusement choisi parmi les suspensions concentrées de graphite, de nitrure de bore, de silice colloïdale, de magnésie, de produits organiques (tels que des huiles organiques ou des polyesters) ou un mélange de ceux-ci. Typiquement, on peut utiliser une suspension mère qui est un concentré de particules de graphite en suspension dans un gel, avec une proportion de graphite typiquement comprise entre 20 et 30 % en poids. Le fluide porteur est alors généralement de l'eau. La proportion de suspension mère ajoutée au fluide porteur est typiquement comprise entre 1 et 8%.Preferably, the adjustment of the composition involves a dilution of a concentrate of potting agent in a carrier fluid. Said concentrate can be a "Mother suspension" means a concentrated solution or a mixture thereof. said concentrate is advantageously chosen from concentrated graphite suspensions, boron nitride, colloidal silica, magnesia, organic products (such as organic oils or polyesters) or a mixture thereof. Typically, we can use a mother suspension which is a concentrate of graphite particles in suspension in a gel, with a proportion of graphite typically between 20 and 30% by weight. The carrier fluid is then generally water. The proportion of mother suspension added to the carrier fluid is typically between 1 and 8%.

En pratique, il peut être avantageux que le procédé selon l'invention comporte également un ajustement du débit de produit de poteyage de manière à obtenir une stabilité du jet dans le temps, en particulier entre le moment où les pistolets sont ajustés par rapport aux cylindres, hors coulée, et pendant la coulée.In practice, it may be advantageous for the method according to the invention to include also an adjustment of the flow rate of the product so as to obtain a jet stability over time, especially between the time the guns are adjusted with respect to the cylinders, outside casting, and during casting.

L'ajustement de la composition peut être effectué rétroactivement en fonction de mesures effectuées sur la machine de coulée (1) (typiquement à l'aide d'une boucle de régulation) et/ou de manière automatisée. Lesdites mesures comprennent typiquement des mesures choisies parmi les mesures optique, laser, infrarouge, de vibrations ou de tension mécanique. Par exemple, la quantité d'agent de poteyage présente en surface (10) des cylindres peut être déterminée à l'aide d'un détecteur (tel qu'un détecteur optique, un système laser, une caméra ou un détecteur infrarouge) qui produit un signal qui peut être utilisé en rétroaction pour réguler la composition du produit de poteyage. Ledit ajustement de la composition peut alors correspondre à une régulation. Le procédé de l'invention peut être compris dans un procédé de régulation d'une machine de coulée continue entre cylindres.The adjustment of the composition can be made retroactively according to measurements made on the casting machine (1) (typically using a loop regulation) and / or automatically. These measures include typically measurements chosen from optical, laser, infrared, vibrations or mechanical tension. For example, the amount of potting agent present on the surface (10) of the cylinders can be determined using a detector (such as an optical detector, a laser system, a camera or a detector infrared) which produces a signal which can be used in feedback to regulate the composition of poteyage product. Said adjustment of the composition can then correspond to a regulation. The process of the invention can be included in a process for regulating a continuous casting machine between cylinders.

Selon l'invention, le dispositif de poteyage d'un cylindre (1A, 1B), qui est apte à être utilisé sur une machine de coulée continue entre cylindres, comprend des moyens d'enduction (5, 51, 52, 6, 61, 62, 7, 8, 20, 21) pour appliquer au moins un produit de poteyage (24) sur lesdits cylindres et est caractérisé en ce qu'il comprend des moyens (30 à 41) pour ajuster la composition du produit de poteyage en cours d'application sur lesdits cylindres.According to the invention, the device for poteying a cylinder (1A, 1B), which is capable of being used on a continuous casting machine between rolls, includes means coating (5, 51, 52, 6, 61, 62, 7, 8, 20, 21) to apply at least one poteyage (24) on said cylinders and is characterized in that it comprises means (30 to 41) to adjust the composition of the coating product during application on said cylinders.

Le dispositif de poteyage selon l'invention est apte à mettre en oeuvre le procédé de poteyage de l'invention.The poteyage device according to the invention is capable of implementing the method of poteyage of the invention.

Les moyens d'enduction comprennent avantageusement des moyens (20) pour contrôler le débit des moyens de projection (5, 51, 52), tels qu'une pompe volumétrique.The coating means advantageously comprise means (20) for control the flow of the projection means (5, 51, 52), such as a pump volumetric.

Les conduits (6, 21) peuvent être en différents matériaux compatibles avec le produit de poteyage et les conditions ambiantes d'une machine de coulée continue. Lorsque les moyens de projection sont mobiles, une partie (6) des conduits est de préférence flexible.The conduits (6, 21) can be made of different materials compatible with the product and the ambient conditions of a continuous casting machine. When the projection means are mobile, a part (6) of the conduits is preferably flexible.

Les moyens d'enduction peuvent être placés à différents endroits sur la périphérie des cylindres. Ils sont toutefois avantageusement placés du côté de la sortie, c'est-à-dire du côté de la bande métallique, afin de ne pas être en contact avec le métal liquide, ce qui pourrait entraíner des risques d'explosion. The coating means can be placed in different places on the periphery cylinders. They are however advantageously placed on the outlet side, that is to say on the side of the metal strip, so as not to be in contact with the metal liquid, which could lead to the risk of explosion.

Dans le cas très fréquent où le produit de poteyage comporte un fluide porteur, tel que de l'eau, et un agent de poteyage solide, tel que du graphite, les moyens de poteyage selon l'invention peuvent également comprendre des moyens (38, 39), actifs ou passifs, tels qu'un agitateur (38) ou une chicane (39), pour homogénéiser le produit de poteyage. Les moyens de poteyage selon l'invention peuvent éventuellement comprendre des moyens (38) pour maintenir en suspension les particules d'agent de poteyage.In the very frequent case where the poteyage product contains a carrier fluid, such than water, and a solid coating agent, such as graphite, the means of dressing according to the invention can also include means (38, 39), active or passive, such as an agitator (38) or a baffle (39), to homogenize the poteyage product. The poteyage means according to the invention can optionally include means (38) for maintaining in suspension the potting agent particles.

Dans un mode de réalisation, préféré de l'invention, qui est illustré à la figure 3, lesdits moyens d'ajustement (30 à 41) de la composition du produit de poteyage comprennent un mélangeur (40), une alimentation en agent de poteyage (41), un moyen de régulation (32) de l'alimentation en agent de poteyage et une alimentation en fluide porteur (30). Le moyen de régulation (32) permet de contrôler et de réguler la quantité d'agent de poteyage qui est apportée au mélangeur (40) et appliquée sur les cylindres par les moyens d'enduction. Le moyen de régulation (32) peut comprendre, par exemple, une pompe doseuse.In a preferred embodiment of the invention, which is illustrated in FIG. 3, said means for adjusting (30 to 41) the composition of the poteyage product include a mixer (40), a supply of poting agent (41), a regulating means (32) for the supply of potetting agent and a supply in carrier fluid (30). The regulating means (32) makes it possible to control and regulate the quantity of potting agent which is supplied to the mixer (40) and applied to the cylinders by the coating means. The regulating means (32) can include, for example, a metering pump.

Ledit mélangeur (40) peut également être un Venturi, un réservoir tampon ou un pot. Le mélangeur (40) est avantageusement de très faible capacité (par exemple de 1 à 2 litres), ce qui permet notamment de faire varier rapidement la concentration en agent de poteyage contenu dans le produit de poteyage. Le mélangeur (40) peut être commun à plusieurs moyens de projection.Said mixer (40) can also be a Venturi, a buffer tank or a pot. The mixer (40) is advantageously of very low capacity (for example from 1 to 2 liters), which in particular makes it possible to rapidly vary the concentration of agent of poteyage contained in the product of poteyage. The mixer (40) can be common to several projection means.

La figure 4 illustre deux modes de réalisation desdits moyens d'ajustement (30 à 41). Dans le mode de réalisation de la figure 4a), lesdits moyens d'ajustement (30 à 41) comprennent un réservoir (34) apte à contenir ledit concentré (35), un moyen de régulation (32) de l'alimentation en agent de poteyage, des moyens de canalisations (31, 33), une alimentation en fluide porteur (30), un réservoir tampon (36) apte à contenir le produit de poteyage (24), une zone de mélange (37) et un agitateur (38). Dans le mode de réalisation de la figure 4b), lesdits moyens d'ajustement (30 à 41) comprennent un réservoir (34) apte à contenir ledit concentré (35), un moyen de régulation (32) de l'alimentation en agent de poteyage, des moyens de canalisations (31, 33), une alimentation en fluide porteur (30), un pot (36) apte à contenir le produit de poteyage (24), une zone de mélange (37), des chicanes (39) et un agitateur (38).FIG. 4 illustrates two embodiments of said adjustment means (30 to 41). In the embodiment of FIG. 4a), said adjustment means (30 to 41) comprise a reservoir (34) capable of containing said concentrate (35), a means of regulation (32) of the supply of potetting agent, of the means of pipelines (31, 33), a supply of carrier fluid (30), a buffer tank (36) capable of contain the cleaning product (24), a mixing zone (37) and an agitator (38). In the embodiment of FIG. 4b), said adjustment means (30 to 41) comprise a reservoir (34) capable of containing said concentrate (35), a means of regulation (32) of the supply of potetting agent, of the means of pipelines (31, 33), a supply of carrier fluid (30), a pot (36) capable of containing the potage product (24), a mixing zone (37), baffles (39) and an agitator (38).

La demanderesse a eu l'idée que la dilution d'un concentré d'agent de poteyage dans un fluide porteur dans un mélangeur (40), notamment lorsque celui-ci est de faible capacité, pouvait permettre d'éviter les problèmes de sédimentation de l'agent de poteyage qui sont souvent observés avec les dispositifs connus (qui fonctionnent en général en mode « batch » en utilisant des réservoirs (22) de grande capacité, à sa voir typiquement entre 100 et 200 litres) et qui entraínent des fluctuations de la composition effective du produit de poteyage par rapport à la valeur nominale. L'utilisation d'un ou plusieurs mélangeurs (40) de faible capacité permet également de réduire leur volume et, par conséquent, la taille des installations de coulée. Elle permet également de simplifier les commandes.The Applicant came up with the idea that the dilution of a concentrate of potting agent in a carrier fluid in a mixer (40), especially when the latter is low capacity, could avoid sedimentation problems of the poteyage which are often observed with known devices (which operate in generally in "batch" mode using large capacity tanks (22), at its see typically between 100 and 200 liters) and which cause fluctuations in the effective composition of the potage product compared to the nominal value. The use of one or more mixers (40) of low capacity also allows to reduce their volume and, consequently, the size of the casting installations. She also simplifies orders.

Lorsque l'agent de poteyage se présente sous la forme d'un concentré (35) apte à être dilué à l'aide du fluide porteur, l'alimentation en agent de poteyage (41) comprend avantageusement un réservoir (34), à partir duquel on peut alimenter, de manière régulée, le mélangeur (40).When the potting agent is in the form of a concentrate (35) capable of being diluted with the carrier fluid, the supply of coating agent (41) comprises advantageously a reservoir (34), from which it is possible to supply, so regulated, the mixer (40).

Les moyens (30 à 41),pour ajuster la composition du produit de poteyage peuvent former un dispositif d'ajustement (42) qui est avantageusement distinct, amovible et/ou démontable, ce qui en facilite l'entretien.The means (30 to 41), for adjusting the composition of the coating product can forming an adjustment device (42) which is advantageously separate, removable and / or removable, which facilitates maintenance.

Le dispositif de poteyage de l'invention peut comprendre des moyens pour contrôler rétroactivement ledit ajustement de la composition en fonction de mesures effectuées sur ladite machine de coulée, par exemple à l'aide d'une boucle de régulation. Il peut également comprendre des moyens pour contrôler de manière automatisée ledit ajustement de la composition.The poteyage device of the invention may include means for controlling retroactively said adjustment of the composition as a function of measurements carried out on said casting machine, for example using a regulation loop. he can also include means for automatically controlling said composition adjustment.

Les moyens de projection (5, 51, 52) sont typiquement choisis dans le groupe comprenant des buses et des pistolets. Les moyens d'enduction peuvent inclure un seul moyen de projection (5) par cylindre (figure 1) ou plusieurs moyens de projection (51, 52) par cylindre (figures 7 et 9). Dans ce dernier cas, les moyens de projection peuvent être superposés (tel qu'illustré à la figure 7) ou répartis le long du cylindre (tel qu'illustré à la figure 9). Les moyens d'enduction peuvent également comprendre des moyens pour déplacer les moyens de projection le long du cylindre, typiquement en un mouvement d'oscillation ou en un mouvement de va-et-vient entre une extrémité (11) et l'autre (12) du cylindre.The projection means (5, 51, 52) are typically chosen from the group including nozzles and guns. The coating means may include a only one projection means (5) per cylinder (figure 1) or several means of projection (51, 52) by cylinder (Figures 7 and 9). In the latter case, the means of projection can be superimposed (as illustrated in figure 7) or distributed along the cylinder (as shown in Figure 9). The coating means can also include means for moving the projection means along the cylinder, typically in a swinging or reciprocating motion between one end (11) and the other (12) of the cylinder.

Selon une variante avantageuse de l'invention, lesdits moyens d'enduction comprennent un moyen de projection (5) pour chaque cylindre (1A, 1B) et des moyens (80 à 84) pour déplacer ledit moyen de projection (5) le long de chaque cylindre, typiquement en un mouvement de va-et-vient.According to an advantageous variant of the invention, said coating means comprise a projection means (5) for each cylinder (1A, 1B) and means (80 to 84) for moving said projection means (5) along each cylinder, typically in a reciprocating motion.

Selon une autre variante avantageuse de l'invention, lesdits moyens d'enduction comprennent au moins deux moyens de projection (51, 52) pour chaque cylindre (1A, 1B), lesdits moyens de projection formant un ensemble solidaire, et des moyens (80 à 84) pour déplacer chaque dit ensemble le long de chaque cylindre, typiquement en un mouvement de va-et-vient. Les moyens de projection de chaque dit ensemble sont avantageusement superposés, tel qu'illustré à la figure 7, lorsqu'on cherche à produire des bandes de grande largeur (ce qui est normalement rendu difficile par la vitesse maximale limitée des moyens de déplacement des moyens de projections).According to another advantageous variant of the invention, said coating means comprise at least two projection means (51, 52) for each cylinder (1A, 1B), said projection means forming an integral assembly, and means (80 to 84) to move each said together along each cylinder, typically back and forth. The means of projection of each said set are advantageously superimposed, as illustrated in Figure 7, when trying to produce wide strips (which is normally made difficult by the limited maximum speed of the displacement means of the projection means).

Les moyens de déplacement (80 à 84) comprennent typiquement un support mobile ou chariot (80), un rail (81) et des moyens d'entraínement (82, 83, 84) tels qu'un moteur. De préférence, lesdits moyens de déplacement (80 à 84) permettent de déplacer lesdits moyens de projection en un mouvement de va-et-vient le long d'un axe parallèle à l'axe (A, B) du cylindre.The displacement means (80 to 84) typically comprise a mobile support or carriage (80), a rail (81) and drive means (82, 83, 84) such as a engine. Preferably, said displacement means (80 to 84) make it possible to moving said projection means in a back and forth movement along a axis parallel to the axis (A, B) of the cylinder.

Selon une autre variante avantageuse de l'invention, lesdits moyens d'enduction comprennent au moins deux moyens de projection (5) pour chaque cylindre et lesdits moyens de projection sont disposés sur une ligne sensiblement parallèle à l'axe (A, B) de chaque dit cylindre (1A, 1B). Les moyens de projection sont typiquement équidistants.According to another advantageous variant of the invention, said coating means comprise at least two projection means (5) for each cylinder and said projection means are arranged on a line substantially parallel to the axis (A, B) of each said cylinder (1A, 1B). The projection means are typically equidistant.

L'orientation des moyens de projection peut être fixe ou variable. Le dispositif selon l'invention peut également comporter des moyens pour faire osciller au moins un des moyens de projection par rapport à un axe déterminé, ce qui permet d'augmenter la surface d'impact du moyen de projection et, éventuellement, d'en diminuer le nombre. L'axe d'oscillation est typiquement vertical.The orientation of the projection means can be fixed or variable. The device according to the invention may also include means for oscillating at least one of the projection means with respect to a determined axis, which makes it possible to increase the impact surface of the projection means and, possibly, to decrease the number. The axis of oscillation is typically vertical.

L'invention est particulièrement avantageuse dans le cas où on utilise au moins deux moyens de projection par cylindre. En effet, dans de tels cas, le recouvrement des cônes de projection (9, 91, 92) et des surfaces d'impact (100, 101, 102) peut entraíner d'importantes variations de la répartition de l'agent de poteyage totale des multiples. moyens de projection. Par exemple, tel qu'illustré schématiquement à la figure 5, où D représente la densité surfacique d'agent de poteyage, la surface d'impact totale de deux moyens de projection juxtaposés peut subir non seulement des variations radiales de la densité, comme c'est le cas d'un seul moyen de projection, mais aussi des variations très importantes de la densité dans la zone de contact entre les cônes de projection et les surfaces d'impact, même si le poteyage peut être proche de la valeur nominale N dans les zones S où les surfaces d'impact ne se recouvrent pas. La figure 5a) correspond au cas où les deux jets forment un angle relativement fermé par rapport à la valeur optimale souhaitée ; le recouvrement entre les cônes de projection et les deux surfaces d'impact est dans ce cas très faible ou nul, ce qui conduit à des zones de sous-poteyage E par rapport à la valeur nominale N. La figure 5b) correspond au cas où les deux jets forment un angle relativement ouvert par rapport à la valeur optimale souhaitée ; le recouvrement entre les cônes de projection et les deux surfaces d'impact est dans ce cas non négligeable, voire important, ce qui conduit à des zones de sur-poteyage R par rapport à la valeur nominale N. La figure 6 montre qu'un effet similaire peut se produire même si les zones de recouvrement entre les surfaces d'impact sont très importantes. Dans ce dernier cas, le quantité de poteyage appliquée dans certaines zones peut fluctuer de manière très importante, passant d'un sous-poteyage dans certaines zones T lorsque l'angle des jets est relativement fermé par rapport à la valeur optimale souhaitée (figure 6a) à un sur-poteyage dans les mêmes zones T lorsque l'angle des jets est relativement ouvert (figure 6b).The invention is particularly advantageous in the case where at least two are used projection means per cylinder. Indeed, in such cases, the recovery of projection cones (9, 91, 92) and impact surfaces (100, 101, 102) can lead to large variations in the distribution of the total surface-active agent multiple. projection means. For example, as shown schematically in the Figure 5, where D represents the surface density of the coating agent, the surface of total impact of two juxtaposed projection means can undergo not only radial variations in density, as is the case with only one means of projection, but also very significant variations in density in the area of contact between the projection cones and the impact surfaces, even if the coating may be close to the nominal value N in areas S where impact surfaces do not not overlap. Figure 5a) corresponds to the case where the two jets form an angle relatively closed compared to the desired optimal value; the overlap between the projection cones and the two impact surfaces is in this case very small or zero, which leads to underpotting areas E compared to the nominal value N. Figure 5b) corresponds to the case where the two jets form a relatively angle open to the desired optimal value; the overlap between the cones of projection and the two impact surfaces is in this case not negligible, even important, which leads to areas of over-poteyage R compared to the value nominal N. Figure 6 shows that a similar effect can occur even if the overlap areas between the impact surfaces are very important. In this last case, the amount of poteyage applied in certain areas can fluctuate by very importantly, going from underpotting in certain T zones when the angle of the jets is relatively closed compared to the desired optimal value (Figure 6a) to overpotting in the same areas T when the angle of the jets is relatively open (Figure 6b).

La machine (1) de coulée continue entre cylindres selon l'invention peut comprendre au moins un détecteur pour déterminer la quantité d'agent de poteyage présente en surface (10) des cylindres qui produit un signal apte à être utilisé en rétroaction pour ajuster de la composition du produit de poteyage. Ledit détecteur est typiquement choisi parmi les détecteurs optiques, les systèmes lasers, les caméras, les détecteurs infrarouge, les détecteurs de vibration et les détecteurs de tension mécanique.The machine (1) for continuous casting between cylinders according to the invention can comprise at least one detector to determine the quantity of potting agent present in surface (10) of the cylinders which produces a signal suitable for being used in feedback for adjust the composition of the product. Said detector is typically chosen from optical detectors, laser systems, cameras, detectors infrared, vibration detectors and mechanical tension detectors.

Dans le procédé de régulation selon l'invention, ledit ajustement peut être effectué en fonction des conditions de fonctionnement de ladite machine (1). Il peut également être effectué rétroactivement en fonction de mesures effectuées sur ladite machine de coulée, par exemple à l'aide d'une boucle de régulation. Lesdites mesures peuvent comprendre des mesures choisies parmi les mesures optique, laser, infrarouge, de vibrations ou de tension mécanique. Ledit ajustement de la composition peut aussi être effectué de manière automatisée.In the regulation method according to the invention, said adjustment can be made by depending on the operating conditions of said machine (1). He can also be performed retroactively based on measurements made on said machine casting, for example using a control loop. These measures may include measurements chosen from optical, laser, infrared, vibrations or mechanical tension. Said adjustment of the composition can also be done automatically.

L'invention concerne surtout la production des bandes en métaux non ferreux, notamment en aluminium ou alliage d'aluminium ou en cuivre ou en alliage cuivreux.The invention relates above all to the production of strips of non-ferrous metals, especially aluminum or aluminum alloy or copper or alloy copper.

ExemplesExamples

Des bandes en alliage d'aluminium 1100 selon la nomenclature de l'Aluminium Association, d'une épaisseur de 3 mm et d'une largeur de 1800 mm, ont été coulées selon l'invention à des vitesses atteignant 3,5 mm/min sous 1000 t/côté d'efforts de serrage, en utilisant une suspension mère de graphite à 21 % diluée dans de l'eau avec un ajustement de la proportion de graphite entre 2 % et 3 % environ. La qualité de la surface des bandes a été vérifiée par une attaque macrographique d'échantillons en pleine largeur. La demanderesse a noté une amélioration significative de la qualité de la surface des bandes, une plus grande reproductibilité de cette qualité et une productivité d'environ 10 % supérieure à celle observée pour des coulées effectuées avec un poteyage en mode batch, avec des réservoirs de grande capacité et un simple réglage du débit de produit de poteyage. Elle attribue ces améliorations à une répartition d'agent de poteyage plus uniforme et mieux contrôlée.1100 aluminum alloy strips according to the Aluminum nomenclature Association, 3 mm thick and 1800 mm wide, were poured according to the invention at speeds of up to 3.5 mm / min at 1000 t / force side tightening, using a mother suspension of 21% graphite diluted in water with an adjustment of the proportion of graphite between 2% and 3% approximately. The quality of the strip surface was verified by a macrographic attack on samples in full width. The Applicant has noted a significant improvement in quality of the surface of the bands, greater reproducibility of this quality and a productivity about 10% higher than that observed for castings carried out with batching in batch mode, with large capacity tanks and a simple regulation of the flow rate of poteyage product. She attributes these improvements to a more uniform and better controlled spreading agent.

Avantages de l'inventionAdvantages of the invention

L'invention, qui peut être intégrée aux procédés et dispositifs de coulée continue entre cylindres existants, permet d'améliorer la qualité des bandes obtenues et la constance du dépôt de poteyage sur les cylindres. La qualité est notamment améliorée par le réglage des jets qui peut rester le même quel que soit le domaine de fonctionnement de la machine. Pour un régime de fonctionnement donné, la constance du dépôt permet de limiter sensiblement la quantité de produit de poteyage nécessaire pour obtenir des bandes de qualité déterminée.The invention which can be integrated into continuous casting methods and devices between existing cylinders, improves the quality of the bands obtained and the consistency of the poteyage deposit on the cylinders. Quality is especially improved by the adjustment of the jets which can remain the same whatever the field of machine operation. For a given operating regime, the consistency of the deposit makes it possible to significantly limit the amount of poteyage product necessary to obtain bands of determined quality.

Claims (41)

  1. A process for coating the rolls (1A, 1B) of a twin-roll casting machine (1) for continuously casting metal strips, including the application of at least one release product to said rolls, said release product containing a release agent and a carrier fluid, characterised in that it includes an adjustment of the composition of said release product while it is applied to said rolls.
  2. A coating process according to claim 1,
    characterised in that said adjustment of the composition comprises an adjustment of the proportion of release agent contained in the release product.
  3. A coating process according to claim 1 or 2, characterised in that it additionally comprises an adjustment of the release product flow.
  4. A coating process according to any one of the claims 1 to 3, characterised in that the release product is a suspension, a solution or a mixture thereof.
  5. A coating process according to any one of the claims 1 to 4, characterised in that the release agent includes graphite.
  6. A coating process according to any one of the claims 1 to 5, characterised in that the carrier fluid includes water.
  7. A coating process according to any one of the claims 1 to 6, characterised in that said adjustment of the composition comprises a dilution of a concentrate of release agent in said carrier fluid.
  8. A coating process according to claim 7,
    characterised in that said concentrate is a mother suspension, a concentrated solution or a mixture thereof.
  9. A coating process according to claim 7 or 8, characterised in that said concentrate is selected from among concentrated suspensions of graphite, boron nitride, colloidal silica, magnesia, organic products or a mixture thereof.
  10. A coating process according to claim 7 or 8, characterised in that said concentrate is a graphite gel containing between 20 and 30% by weight of graphite.
  11. A coating process according to any one of the claims 1 to 10, characterised in that said adjustment of the composition is carried out retroactively as a function of measurements carried out on said casting machine.
  12. A coating process according to claim 11, characterised in that it includes a regulation loop.
  13. A coating process according to claim 11 or 12, characterised in that said measurements include measurements selected from among optical, laser, infrared, vibration, or mechanical tension measurements.
  14. A coating process according to any one of the claims 1 to 13, characterised in that said adjustment of the composition is carried out in an automated way.
  15. A process for twin-roll continuous casting of metal strips including a coating process according to any one of the claims 1 to 14.
  16. A continuous casting process according to claim 15, characterised in that said metal strips are made of aluminium, aluminium alloy, copper or copper alloy.
  17. A device for coating rolls (1A, 1B) of a twin-roll casting machine (1) for continuously casting metal strips, including coating means (5, 51, 52, 6, 61, 62, 7, 8, 20, 21) for applying at least one release product (24) to said rolls, characterised in that it includes means (30 to 41) for adjusting the composition of said release product while it is applied to said rolls.
  18. A coating device according to claim 17,
    characterised in that said means for adjusting the composition include a mixer (40), a release agent feed (41), a means (32) of regulating the release agent feed and a carrier fluid feed (30).
  19. A coating device according to claim 18,
    characterised in that the regulation means (32) includes a measuring pump.
  20. A coating device according to claim 18 or 19, characterised in that the release agent feed (41) includes a tank (34) fit to contain a release agent concentrate (35).
  21. A coating device according to any one of the claims 17 to 20, characterised in that it includes means (38, 39) for homogenising the release product.
  22. A coating device according to any one of the claims 17 to 21, characterised in that the coating means include means (20) for controlling the flow of the spray means (5, 51, 52).
  23. A coating device according to any one of the claims 17 to 22, characterised in that said coating means include a spray means (5) for each roll (1A, 1B) and means (80 to 84) for displacing said spray means (5) along each roll.
  24. A coating device according to any one of the claims 17 to 22, characterised in that said coating means include at least two spray means (51, 52) for each roll (1A, 1B), said spray means forming an integral unit, and means (80 to 84) for displacing each said unit along each roll.
  25. A device according to claim 24, characterised in that the spray means of each said unit are superposed.
  26. A device according to any one of the claims 23 to 25, characterised in that said displacement means (80 to 84) make it possible to displace said spray means in a to-and-fro motion along an axis parallel to the axis (A, B) of the rolls.
  27. A coating device according to any one of the claims 17 to 22, characterised in that said coating means include at least two spray means (5) for each roll and in that said spray means are placed on a line approximately parallel to the axis (A, B) of each said roll (1A, 1B).
  28. A coating device according to any one of the claims 17 to 27, characterised in that it comprises means for making at least one of the spray means oscillate relative to a specific axis.
  29. A coating device according to any one of the claims 17 to 28, characterised in that the spray means (5, 51, 52) are selected from the group including nozzles and guns.
  30. A coating device according to any one of the claims 17 to 29, characterised in that it includes means for controlling retroactively said adjustment of the composition as a function of measurements carried out on said casting machine.
  31. A coating device according to any one of the claims 17 to 30, characterised in that it includes means for controlling in an automated way said adjustment of the composition.
  32. A coating device according to any one of the claims 17 to 31, characterised in that said means (30 to 41) for adjusting the composition of the release product may form an adjustment device (42), which is distinct, detachable and/or able to be dismantled.
  33. A machine for twin-roll continuous casting of metal strips equipped with a coating device according to any one of the claims 17 to 32.
  34. A machine according to claim 33, characterised in that it includes at least one sensor for determining the quantity of release agent present on the surface (10) of the rolls which produces a signal able to be used retroactively for adjusting the composition of the release product.
  35. A machine according to claim 34, characterised in that said sensor is selected from among optical sensors, laser systems, cameras, infrared sensors, vibration sensors and mechanical tension sensors.
  36. A process for regulating a machine (1) for twin-roll continuous casting of metal strips including the application of at least one release product on said rolls, said release product containing a release agent and a carrier fluid, characterised in that it includes an adjustment of the composition of said release product while it is applied to said rolls.
  37. A regulation process according to claim 36, characterised in that said adjustment is carried out as a function of the operating conditions of said machine (1) .
  38. A regulation process according to claim 36 or 37, characterised in that said adjustment of the composition is carried out retroactively as a function of measurements carried out on said casting machine.
  39. A regulation process according to claim 38, characterised in that it includes a regulation loop.
  40. A regulation process according to claim 38 or 39, characterised in that said measurements include measurements selected from among optical, laser, infrared, vibration, or mechanical tension measurements.
  41. A regulation process according to any one of the claims 36 to 40, characterised in that said adjustment of the composition is carried out in an automated way.
EP02703655A 2001-02-08 2002-02-05 Method and device for refractory dressing of rolls of a metal strip continuous casting machine Expired - Lifetime EP1358029B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0101724A FR2820350B1 (en) 2001-02-08 2001-02-08 METHOD AND DEVICE FOR POTTING THE CYLINDERS OF A CONTINUOUS CASTING MACHINE FOR METAL STRIPS
FR0101724 2001-02-08
PCT/FR2002/000441 WO2002062508A1 (en) 2001-02-08 2002-02-05 Method and device for refractory dressing of rolls of a metal strip continuous casting machine

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EP1358029A1 EP1358029A1 (en) 2003-11-05
EP1358029B1 true EP1358029B1 (en) 2004-06-02

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JP (1) JP2004532127A (en)
CN (1) CN1263567C (en)
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DE (1) DE60200587T2 (en)
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CN1911545B (en) * 2006-08-18 2012-05-23 上海诸光机械有限公司 Technological lubricating system of hot mill steel plate continuous milling machine
CN101367117B (en) * 2007-08-17 2010-12-15 宝山钢铁股份有限公司 On-line surface treating method for crystallization roller of thin belt continuous casting process
CN103084394B (en) * 2013-02-27 2015-03-18 云南铝业股份有限公司 Method for removing tiger-stripes of cast rolling plate surface
CN108103302A (en) * 2018-01-09 2018-06-01 常州艾柯轧辊有限公司 A kind of cold roll whole heat treatment process
CN110904292B (en) * 2019-12-05 2020-10-02 四川大学 Intelligent paste wiping operation device
CN111496201A (en) * 2020-05-26 2020-08-07 武汉钢铁有限公司 Anti-sticking coating for copper plate of continuous casting crystallizer and continuous casting crystallizer with anti-sticking coating
CN111761036B (en) * 2020-07-08 2022-03-01 甘肃东兴铝业有限公司 Casting and rolling method for 6xxx series aluminum alloy plate for automobile
DE102021100216A1 (en) * 2021-01-08 2022-07-14 Universität Kassel, Körperschaft des öffentlichen Rechts Method for monitoring the coverage of a mold surface of a mold with a process aid in a casting process

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CN1263567C (en) 2006-07-12
IL156732A (en) 2008-06-05
FR2820350B1 (en) 2003-03-07
FR2820350A1 (en) 2002-08-09
CZ296422B6 (en) 2006-03-15
WO2002062508A1 (en) 2002-08-15
ES2219630T3 (en) 2004-12-01
NO20033477L (en) 2003-08-05
CA2438038A1 (en) 2002-08-15
BR0207027A (en) 2004-02-17
EP1358029A1 (en) 2003-11-05
JP2004532127A (en) 2004-10-21
RU2288068C2 (en) 2006-11-27
DE60200587T2 (en) 2009-10-01
DE60200587D1 (en) 2004-07-08
IL156732A0 (en) 2004-02-08
CZ20032247A3 (en) 2004-02-18
TR200401358T4 (en) 2004-07-21
CA2438038C (en) 2009-07-21
NO20033477D0 (en) 2003-08-05
CN1491139A (en) 2004-04-21
MXPA03006997A (en) 2003-11-18
RU2003127068A (en) 2005-03-10
ATE268238T1 (en) 2004-06-15

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