EP2522759A1 - Treatment facility with molten metal bath and submerged rollers - Google Patents

Treatment facility with molten metal bath and submerged rollers Download PDF

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Publication number
EP2522759A1
EP2522759A1 EP12162168A EP12162168A EP2522759A1 EP 2522759 A1 EP2522759 A1 EP 2522759A1 EP 12162168 A EP12162168 A EP 12162168A EP 12162168 A EP12162168 A EP 12162168A EP 2522759 A1 EP2522759 A1 EP 2522759A1
Authority
EP
European Patent Office
Prior art keywords
ferrule
carbon
installation according
ring
mandrel
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.)
Granted
Application number
EP12162168A
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German (de)
French (fr)
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EP2522759B1 (en
Inventor
Marc Lacoste
Alain Lacoste
Olivier Devret
Rémi BESSETTES
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.)
ArianeGroup SAS
Original Assignee
SNECMA Propulsion Solide SA
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Publication of EP2522759A1 publication Critical patent/EP2522759A1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the present invention relates to facilities for processing metal strips by molten metal such as galvanizing plants.
  • These facilities include one or more baths of molten metal, such as a molten zinc bath, in which the metal strips are immersed.
  • the metal strips circulate continuously throughout the installation and in particular in molten metal baths.
  • each bath comprises one or more rollers partially or totally immersed in the bath so as to guide and maintain the metal strip immersed in the molten metal during its passage in the bath.
  • the rollers usually used in this type of bath are made of metallic material, for example steel.
  • the bath contains other metallic materials which are added for example to regulate the reaction between the metal strip and the bath, as is the case aluminum in a zinc bath, or which come from the strip itself or rollers and other parts immersed in the bath, such as iron from the steel of the strip treated.
  • These additional materials react with the metal of the bath, in particular forming precipitates or intermetallic solid particles such as particles of Fe / ZN, Fe / Al or Fe / Al / Zn (Fe 2 Al 5 Zn) type in the case of a bath of zinc.
  • the adhesion of the intermetallic solid particles on the surface of the rollers causes the formation of defects on the strip ("pick-up"), which deteriorates its quality.
  • the object of the present invention is therefore to propose a new installation for treating metal strips by dipping in a molten metal equipped with rollers that are less sensitive to the intermetallic solid particles present in the baths.
  • the invention proposes a metal strip treatment plant by dipping in a bath of molten metal which comprises at least one roller partially or totally immersed in the bath, the roller or rolls comprising at least one ferrule intended to be in contact with the metal strip to be treated, installation in which the shell is made of composite material formed of a carbon fiber reinforcement or ceramic densified by a matrix at least partially carbon or ceramic.
  • the treatment plant of the invention therefore makes it possible to increase productivity by reducing production downtime required for the maintenance or replacement of rollers.
  • the life of the rollers provided with reinforcing ferrules made of carbon fiber or ceramic densified by an at least partially carbon matrix is further increased compared to metal rollers of the prior art.
  • intermetallic particles are deposited on the surface of such a ferrule, these particles do not adhere to the composite material of the ferrule and can therefore be removed easily, for example by scraping, this which does not cause loss of material of the ferrule.
  • This low adhesion is due in particular to the absence of chemical interactions between the composite material of the shell and that of the particles, which is not the case with rolls of metallic material.
  • the ferrule of a roll of the plant of the invention may in particular be formed of one of the following composite materials: carbon-carbon composite material (CC) possibly having on its outer surface a layer of silicon carbide, a carbon-carbon composite material. carbon / silicon carbide (CC / SiC) and composite material silicon carbide-silicon carbide (SiC-SiC).
  • CC carbon-carbon composite material
  • SiC-SiC composite material silicon carbide-silicon carbide
  • each roll comprises at least one rocket made of metallic material and one element for holding the ferrule on each rocket, the element comprising a crown or a plurality of crown segments fixed on one end of the ferrule , each ring or ring segment being extended by at least one resilient tongue whose end is supported on the rocket.
  • each rocket further comprises a mandrel having a plurality of teeth and splines, the ferrule also comprising a plurality of teeth and splines respectively engaged with the grooves and the teeth of each mandrel.
  • each roller further comprises an annular reinforcing element placed around each ring or each plurality of ring segments.
  • the annular reinforcement element makes it possible to ensure the fixing of the crowns on the ferrule in particular with respect to the centrifugal forces and the forces to which the roller may be subjected in operation (for example contact forces with the belt).
  • Each annular reinforcing element may be formed of an elastic collar of prestressed metal material or of a collar or a ring of a material having a coefficient of thermal expansion identical to or slightly greater than the material of the rings.
  • each roller comprises a mandrel of metal material extended at each end by a rocket, the mandrel comprising a plurality of teeth and splines.
  • the ferrule is in this case arranged around the mandrel and also comprises a plurality of teeth and splines respectively engaged with the splines and the teeth of the mandrel.
  • First and second radial clearances are preferably arranged between, on the one hand, the top of the teeth of the mandrel and the bottom of the flutes of the shell and, on the other hand, between the top of the teeth of the shell and the bottom of the grooves of each mandrel.
  • each roller comprises two fuses fixed on each side of the shell, each rocket being extended by a shaft of metallic material, the shafts and the rockets having a frustoconical contact surface.
  • the molten metal bath contains liquid zinc for carrying out a galvanization treatment.
  • the invention is generally applicable to metal strip processing plants using one or more of molten metal baths in which the strip is quenched.
  • a particular, but not exclusive, field of application of the invention is that of galvanizing plants comprising one or more zinc baths in which steel strips are hardened to be treated.
  • the figure 1 illustrates a continuous galvanizing plant or line 10 which comprises a tank 11 filled with molten zinc 12 maintained at a temperature of about 450 ° C., the bath typically comprising an aluminum content of 0.20%. Soaking a steel strip 13 in the bath by circulating the strip between an inlet 11a and an outlet 11b of the bath along a path that is defined by means of three rollers 14, 15 and 16 immersed in the bath of zinc.
  • the treatment plant comprises one or more rollers, such as the rollers 14, 15 and 16 illustrated in FIG. figure 1 , whose part intended to be in contact with the band to be treated, namely the ferrule, is made of a composite material formed of a reinforcement of carbon fibers or ceramic densified by a matrix which may be partially or completely carbon or ceramic.
  • the shell of composite material may be further covered with a layer of silicon carbide.
  • the manufacture of composite material parts consisting of a fiber reinforcement densified by a matrix is well known. It mainly comprises the production of a fibrous structure, here made of carbon or ceramic fibers, the shaping of the structure in a shape similar to that of the part to be manufactured (fibrous preform) and the densification of the preform by the matrix. .
  • the fibrous structure is the reinforcement of the part whose role is essential vis-à-vis the mechanical properties.
  • the fibrous structure must be a coherent structure to give the composite material a structural character which makes it possible to obtain a self-supporting ferrule.
  • structure or coherent fibrous reinforcement is meant here a reinforcement or a structure capable of maintaining its cohesion during handling as opposed to the mixed fibers in dispersed form, that is to say in a non-coherent manner, in a material such as a ceramic.
  • the fibers correspond to fillers and do not constitute a coherent fibrous reinforcement within the meaning of the present invention.
  • the shaping is performed by filament winding, UD web winding on a mandrel, weaving, stacking, needling of two-dimensional / three-dimensional strata or plies of cables, etc.
  • the fiber preform is then densified, in a well-known manner, by liquid and / or gaseous means.
  • Liquid densification comprises impregnating the preform with a liquid composition containing a precursor of the matrix material.
  • the precursor is usually in the form of a polymer, such as a resin, optionally diluted in a solvent.
  • the transformation of the precursor into carbon or ceramic is carried out by heat treatment after removal of the optional solvent and crosslinking of the polymer. Several successive impregnation cycles can be performed to achieve the desired degree of densification.
  • a carbon precursor resin may for example be a phenolic type resin.
  • a ceramic precursor resin may be, for example, a polycarbosilane precursor resin of silicon carbide (SiC), or a polysiloxane resin precursor of SiCO, or a polyborocarbosilazane resin precursor of SiCNB, or a polysilazane resin (SiCN).
  • the fibrous preform is first impregnated with a precursor resin of the carbon phase of the matrix, such as a phenolic type resin, and then an SiC precursor resin, such as than a polycarbosilane resin.
  • a fibrous preform intended to constitute the fibrous reinforcement of the part to be produced is maintained in shape by conformation of the fibrous texture by means of a holding tooling .
  • the shaping of the fibrous preform may be accompanied by a compacting of the fibrous structure in order to increase the volume content of fibers in the composite material of the part to be produced.
  • the crosslinking of the resin is performed, or completed if there has been pre-crosslinking, the preform being in a tool.
  • the polymerized resin is then converted into carbon by heat treatment.
  • the fibrous preform is then impregnated with a ceramic precursor resin.
  • the resin is heat treated to be converted into ceramic. In general, no tools for maintaining the blank are necessary, the latter being sufficiently solidified by the previously deposited carbon matrix.
  • the impregnation and polymerization operations of carbon precursor resin and / or ceramic precursor resin can be repeated several times if necessary to obtain specific mechanical characteristics.
  • the densification of the fiber preform may also be carried out, in a known manner, by gaseous method by chemical vapor infiltration of the matrix (CVI).
  • CVI chemical vapor infiltration of the matrix
  • the fiber preform corresponding to the structure to be produced is placed in an oven in which a gaseous reaction phase is admitted.
  • the pressure and the temperature prevailing in the furnace and the composition of the gas phase are chosen so as to allow the diffusion of the gas phase within the porosity of the preform to form the matrix by deposition, in the heart of the material in contact with it.
  • a carbon matrix can be achieved with hydrocarbon gases such as methane and / or propane giving the carbon by cracking while an SiC matrix can be obtained with methyltrichlorosilane (MTS) giving SiC by decomposition of the MTS.
  • hydrocarbon gases such as methane and / or propane giving the carbon by cracking
  • SiC matrix can be obtained with methyltrichlorosilane (MTS) giving SiC by decomposition of the MTS.
  • MTS methyltrichlorosilane
  • the first carbon phase can be formed with hydrocarbon gases giving the carbon by cracking, the second SiC phase then being deposited on the first carbon phase, for example by decomposition of the MTS.
  • a densification combining liquid route and gaseous route can also be used to facilitate implementation, limit costs and production cycles while obtaining satisfactory characteristics for the intended use.
  • a roller 50 according to the invention may consist of a simple ferrule 51 made of a composite material as described above and kept in the bath by internal or external bearings fixed on the walls of the tank (not shown on the figure 2 ).
  • the ferrule 51 is self-supporting in that it has a structure sufficiently strong to withstand the forces to which the roller is subjected without inner support.
  • a roll 100 according to the invention comprises a shell 120 made of a composite material as described above and two rockets 130 and 140 mounted at each end of the shell 120 and intended to be supported by bearings on the walls of the tank containing the molten metal bath (not shown on the figures 3 and 4 ).
  • the flares 130 and 140 are made of metal material, for example steel of the stainless steel type.
  • Each rocket 130, respectively 140 comprises a mandrel 131, respectively 141, a frustoconical portion 132, respectively 142, which is extended by a shaft 133, respectively 143.
  • the rocket 130 comprises a series of splines 1310 annularly distributed on the outer surface of the mandrel 131 and delimiting a series of teeth 1320.
  • the mandrel 141 of the rocket 140 comprises a series of splines 1410 uniformly distributed over the surface external of the latter and delimiting a series of teeth 1420.
  • the shell 120 has splines 1210 and teeth 1220 annularly distributed on its inner surface and intended to be engaged with the teeth 1320 and 1420 and the splines 1310 and 1410 respectively of the flares 130 and 140.
  • the flutes 1210 may be directly formed during the manufacture of the composite material part by conformation of the fibrous reinforcement or after manufacture of the workpiece by machining its inner surface.
  • a radial clearance "cold" that is to say a game only present when the roller is at temperature ambient, may be provided between the top of the teeth of each mandrel and the bottom of the fluting of the shell, on the one hand, and between the top of the teeth of the shell and the bottom of the flutes of each mandrel, on the other.
  • the shell 120 can also be clamped in translation on the flares 130 and 140 by means of elastic holding elements 150 and 160 disposed at each end of the shell 120 and each formed, in the example described here, of two crown segments 151 and 152, respectively 161 and 162 extended by tongues or elastic tabs 153, respectively 163.
  • Each ring segment 151, 152, 161 and 162 can be formed from a metal piece shaped and machined to form the resilient tongues 153 and 163.
  • the elastic holding elements 150 and 160 namely in the embodiment described here the ring segments 151, 152 and 161, 162, are respectively fixed to the two ends 120a and 120b of the shell 120 while the elastic tabs of these elements exert a holding pressure respectively on the frustoconical portion 132 of the rocket 130 and on the frustoconical portion 142 of the rocket 140.
  • the roll 100 further comprises two annular reinforcing elements 156 and 166 disposed respectively around the ring segments 151, 152 and 161, 162.
  • each annular reinforcement element 156, 166 respectively consists of an elastic collar or ring 1560, respectively 1660, made from a strip of metal strip, for example steel with high elastic characteristics.
  • Each elastic collar is preloaded on the corresponding ring segments.
  • the annular reinforcing element may be formed of a collar or split ring preloaded on the rings, the collar or the ring being made of metal material (for example steel).
  • the ends of each collar do not overlap but deviate more or less from each other according to the temperatures encountered.
  • the reinforcing element may be formed of a collar or ring made of a material having a coefficient of thermal expansion similar to or slightly greater than that of the material of the rings. In this case, it is not necessary to provide the possibility of elastic deformation for the holding element due to the absence of differential expansions between the rings and the annular reinforcing element.
  • the elastic holding elements 150 and 160 make it possible to maintain the shell 120 in a longitudinal position in a balanced position on the frustoconical portions 132 and 142 of the flares 130 and 140 while absorbing the axial variations due to the differential thermal expansions between the flares and the ferrule.
  • the flares 130 and 140 expand while the shell 120 retains its volume because of its low coefficient of expansion.
  • the frustoconical portions 132 and 142 and the resilient tabs 153 and 163 resting on them the expansion of the rockets do not cause deformation of a ferrule.
  • the elastic tongues deform slightly and slide on the frustoconical portions of the rockets with which they are in contact and thus maintain the axial position of the ferrule while compensating for differential expansion.
  • the axial retention of the ferrule is always ensured by the elastic return of the tongues.
  • the elastic holding members of the invention are not limited to a structure formed of two ring segments. These may be may for example be formed of a single ring having resilient tongues distributed uniformly around one end of said ring or four ring segments each having resilient tongues.
  • the figure 5 illustrates a roller 300 according to another embodiment of a roller according to the invention.
  • the roll 300 comprises a mandrel 310, each end of which is extended by a spindle 311, respectively 312.
  • the roll 300 further comprises a ferrule 320 made according to the invention made of composite material as described above.
  • the ferrule 320 is further clamped in translation on the mandrel 310 by means of resilient retaining elements 316 disposed at each end of the shell 320.
  • the ferrule 320 has on its inner surface teeth 3210 and 3220 engaged in splines 313 formed on the outer surface of the mandrel 410, for example by machining.
  • the shell 320 is positioned around the mandrel 310 by providing a radial clearance to cold between the surfaces facing these two elements to compensate for hot differential expansion between these two elements.
  • FIG. 6 and 7 illustrate a roller 200 which differs in particular from the roller 200 described above in that it comprises a ferrule 220 made of a composite material as described above and which is self-supporting, that is to say which has, like the ferrule 51 described above, a sufficiently strong structure to withstand the forces to which the roller is subjected without inner support.
  • the roller 200 comprises two fuses 213 and 214 respectively connected to the ferrule 220 and made of the same composite material as the shell 220. More specifically, as shown in FIG.
  • the rocket 214 comprises at its end of large diameter a thread 2141 intended to cooperate with a thread 2210 formed on the inner wall of the shell 220.
  • the rocket 214 is screwed onto the shell 220 and secured thereto by a pin 224 fixed in orifices 2211 and 2140 respectively formed in the shell 220 and in the rocket 214. It is the same for the attachment of the rocket 213 to the shell 220.
  • Each fuse 213, respectively 214 is provided with a shaft 211, respectively 212 made of metallic material. More specifically, as illustrated on the figure 7 , the shaft 212 has at one end a flared portion 2120 which acts as a stop and, at the other end, a threaded portion 2122 and a groove 2123 protruding outside the rocket 214.
  • the shaft 212 is secured in rotation with the rocket 214, for example, by a clutch 215 which is engaged both with the groove 2123 of the shaft 212 and with a lug 2142 of the rocket 214.
  • the clamping of the clutch 215 as well as the shaft 212 is provided by two nuts 216 cooperating with the thread 2122 of the shaft. It is the same for the mounting and securing of the shaft 211 on the rocket 213.
  • the dilations of the shafts do not cause deformation of the cylindrical shell.
  • the contact surfaces between the shafts and the frustoconical elements each have a center of symmetry (generator) which coincides with the axis of the shell and, therefore, the roller.
  • Means allowing the internal volume of the ferrule to fill with the metal of the bath are provided where appropriate to facilitate immersion and maintenance of the roll in the bath.
  • These means may for example correspond to vents or openings on the rockets of the rollers for communicating the internal volume of the roll with the outside, that is to say the molten metal bath.
  • the Holder has carried out tests consisting in immersing in different plating baths specimens made of the same composite materials as those described above for the manufacture of the shell of the roll or rolls of the installation according to the invention. These tests were carried out galvanizing baths maintained at a temperature of about 450 ° C and composed mainly of molten zinc with a variable aluminum content in the baths, iron being brought into the bath during dipping strips.
  • the first test consisted of dipping for several consecutive days in the baths described above specimens made of carbon-carbon / silicon carbide (CC / SiC) material, namely a piece formed of a carbon fiber reinforcement and densified by a matrix comprising a carbon phase and a silicon carbide phase. After several days of immersion in the bath, the test tube had practically no intermetallic solid particles on its surface.
  • CC / SiC carbon-carbon / silicon carbide
  • test pieces made of carbon-carbon composite material that is to say a part formed of a carbon fiber reinforcement densified by a carbon matrix.
  • rollers of which at least the ferrule is made of a composite material formed of a reinforcement of carbon or ceramic fibers densified by an at least partially carbon matrix in molten metal baths of a treatment plant makes it possible to significantly reduce the frequency of maintenance or roll replacement operations related to solid particle formation intermetallic ("dross") on the surface of the latter and thus increase the productivity of the installation.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The treatment installation (10) comprises a molten metal bath (11) in which a metal strip (13) to be hardened is provided, and a roller (14, 15, 16) partially or totally submerged in the bath. The roller comprises a ferrule intended to be in contact with the metal strip to be treated, a reamer made of metal material, an element to maintain the ferrule on the reamer, and an annular reinforcement element. The ferrule is made of a composite material, which is formed of carbon reinforcement fiber, ceramic that is partially densified by a carbon or ceramic. The treatment installation (10) comprises a molten metal bath (11) in which a metal strip (13) to be hardened is provided, and a roller (14, 15, 16) partially or totally submerged in the bath. The roller comprises a ferrule intended to be in contact with the metal strip to be treated, a reamer made of metal material, an element to maintain the ferrule on the reamer, and an annular reinforcement element. The ferrule is made of: a composite material, which is formed of carbon reinforcement fiber, ceramic that is partially densified by a carbon or ceramic; carbon-carbon/silicon carbide composite material; carbon-carbon composite material; or silicon carbide-silicon carbide composite material. The ferrule comprises a silicon carbide layer on its external surface, sprockets, and rings. The element comprises a ring or ring segments attached to end of the ferrule. Each ring segment is extended by a resilient tongue whose end is supported on the reamer. The reamer comprises a spindle including sprockets and rings. A first radial clearance is provided between top of sprockets of the spindle and bottom of grooves of the ferrule, and a second radial clearance is provided between top of sprockets of the ferrule and bottom of grooves of the spindle. The annular reinforcement element is placed around the ring or ring segments. The annular reinforcement element comprises an elastic collar made of a prestressed metal material and a material having an expansion coefficient, which is equal to or slightly greater than a thermal expansion coefficient of the ring or ring segments. The reamer is extended by a shaft made of a metal material. The shaft and the reamer have a frustoconical contact surface. The bath contains liquid zinc.

Description

La présente invention concerne les installations de traitement de bandes métalliques par du métal fondu tels que les installations de galvanisation. Ces installations comprennent un ou plusieurs bains de métal fondu, tels qu'un bain de zinc fondu, dans lesquels les bandes métalliques sont plongés. Conformément au processus industriel, les bandes métalliques circulent en continu dans toute l'installation et en particulier dans les bains de métal fondu. A cette effet, chaque bain comprend un ou plusieurs rouleaux partiellement ou totalement immergés dans le bain de manière à guider et maintenir la bande métallique immergée dans le métal fondu lors de son passage dans le bain. Les rouleaux habituellement utilisés dans ce type de bain sont en matériau métallique, par exemple en acier.The present invention relates to facilities for processing metal strips by molten metal such as galvanizing plants. These facilities include one or more baths of molten metal, such as a molten zinc bath, in which the metal strips are immersed. In accordance with the industrial process, the metal strips circulate continuously throughout the installation and in particular in molten metal baths. For this purpose, each bath comprises one or more rollers partially or totally immersed in the bath so as to guide and maintain the metal strip immersed in the molten metal during its passage in the bath. The rollers usually used in this type of bath are made of metallic material, for example steel.

En outre du métal fondu majoritairement utilisé pour le traitement proprement dit, comme par exemple du zinc, le bain contient d'autres matériaux métalliques qui sont ajoutés par exemple pour réguler la réaction entre la bande métallique et le bain, comme c'est le cas de l'aluminium dans un bain de zinc, ou qui proviennent de la bande elle-même ou des rouleaux et autres pièces immergées dans le bain, comme par exemple du fer provenant de l'acier de la bande traitée. Ces matériaux supplémentaires réagissent avec le métal du bain en formant notamment des précipités ou particules solides intermétalliques telles que des particules de type Fe/ZN, Fe/Al, ou Fe/Al/Zn (Fe2Al5Zn) dans le cas d'un bain de zinc. Ces particules, encore appelées «dross» adhèrent à la surface des rouleaux métalliques présents dans le bain et conduisent à une abrasion des rouleaux eux-mêmes (de plusieurs millimètres par mois, voire par semaine) nécessitant le décapage de ces derniers, par exemple à l'acide chlorhydrique, ou leur usinage lorsque cela est possible. Une telle maintenance implique l'arrêt de l'installation et, par conséquent, une baisse de productivité de l'installation. En outre, même en procédant à un usinage et au dépôt d'un revêtement de protection sur le rouleau toutes les deux semaines environ, la durée de vie des rouleaux n'excède pas en général 2 à 3 mois, ceux-ci devant alors être remplacés.In addition molten metal mainly used for the actual treatment, such as zinc, the bath contains other metallic materials which are added for example to regulate the reaction between the metal strip and the bath, as is the case aluminum in a zinc bath, or which come from the strip itself or rollers and other parts immersed in the bath, such as iron from the steel of the strip treated. These additional materials react with the metal of the bath, in particular forming precipitates or intermetallic solid particles such as particles of Fe / ZN, Fe / Al or Fe / Al / Zn (Fe 2 Al 5 Zn) type in the case of a bath of zinc. These particles, also called "dross" adhere to the surface of the metal rollers present in the bath and lead to abrasion of the rollers themselves (several millimeters per month, or even per week) requiring the stripping of the latter, for example to hydrochloric acid, or their machining where possible. Such maintenance involves stopping the installation and, consequently, a decrease in the productivity of the installation. Moreover, even when proceeding to a machining and depositing a protective coating on the roll every two weeks, the life of the rollers does not generally exceed 2 to 3 months, they must then be replaced.

Par ailleurs, l'adhérence des particules solides intermétalliques sur la surface des rouleaux entraîne la formation de défauts sur la bande (« pick-up »), ce qui détériore sa qualité.Moreover, the adhesion of the intermetallic solid particles on the surface of the rollers causes the formation of defects on the strip ("pick-up"), which deteriorates its quality.

Or, il existe un besoin de réduire significativement la fréquence des opérations de maintenance ou de remplacement des rouleaux utilisés dans les bains de métal fondu des installations de traitement.However, there is a need to significantly reduce the frequency of maintenance or replacement of the rollers used in molten metal bath processing facilities.

Objet et résumé de l'inventionObject and summary of the invention

La présente invention a, par conséquent, pour but de proposer une nouvelle installation de traitement de bandes métalliques par trempage dans un métal fondu équipée de rouleaux moins sensibles aux particules solides intermétalliques présentes dans les bains.The object of the present invention is therefore to propose a new installation for treating metal strips by dipping in a molten metal equipped with rollers that are less sensitive to the intermetallic solid particles present in the baths.

A cet effet, l'invention propose une installation de traitement de bande métalliques par trempage dans un bain de métal fondu qui comprend au moins un rouleau partiellement ou totalement immergé dans le bain, le ou les rouleaux comprenant au moins une virole destinée à être en contact avec la bande métallique à traiter, installation dans laquelle la virole est en matériau composite formé d'un renfort en fibres de carbone ou céramique densifié par une matrice au moins partiellement carbone ou céramique.For this purpose, the invention proposes a metal strip treatment plant by dipping in a bath of molten metal which comprises at least one roller partially or totally immersed in the bath, the roller or rolls comprising at least one ferrule intended to be in contact with the metal strip to be treated, installation in which the shell is made of composite material formed of a carbon fiber reinforcement or ceramic densified by a matrix at least partially carbon or ceramic.

La titulaire a observé que des échantillons réalisés avec des matériaux composites tels que définis ci-dessus ne comportaient pas ou quasiment pas de particules solides intermétalliques (« dross ») sur leur surface, et ce même après des longs temps de séjour dans des bains de métal fondu, tels que des bains de galvanisation ayant différentes teneurs en aluminium.The licensee has observed that samples made with composite materials as defined above did not have or almost no intermetallic solid particles ("dross") on their surface, even after long residence times in baths. molten metal, such as galvanizing baths having different levels of aluminum.

Ainsi, la fréquence des opérations de maintenance des rouleaux, dues à la présence de particules intermétalliques sur ces derniers habituellement élevée avec les rouleaux métalliques, peut être considérablement réduite avec l'utilisation de viroles selon l'invention. L'installation de traitement de l'invention permet, par conséquent, d'en augmenter la productivité en diminuant les arrêts production nécessaires pour la maintenance ou le remplacement des rouleaux.Thus, the frequency of maintenance operations of the rolls, due to the presence of intermetallic particles on them usually high with the metal rollers, can be considerably reduced with the use of ferrules according to the invention. The treatment plant of the invention therefore makes it possible to increase productivity by reducing production downtime required for the maintenance or replacement of rollers.

La durée de vie des rouleaux munis de viroles à renfort en fibres de carbone ou céramique densifié par une matrice au moins partiellement carbone est en outre accrue par rapport aux rouleaux métalliques de l'art antérieur.The life of the rollers provided with reinforcing ferrules made of carbon fiber or ceramic densified by an at least partially carbon matrix is further increased compared to metal rollers of the prior art.

Par ailleurs, même dans le cas où des particules intermétalliques se déposent sur la surface d'une telle virole, ces particules n'adhèrent pas au matériau composite de la virole et peuvent, par conséquent, être retirées facilement, par exemple par raclage, ce qui n'entraîne pas de perte de matière de la virole. Cette faible adhérence est notamment due à l'absence d'interactions chimiques entre le matériau composite de la virole et celui des particules, ce qui n'est pas le cas avec des rouleaux en matériau métallique.Moreover, even in the case where intermetallic particles are deposited on the surface of such a ferrule, these particles do not adhere to the composite material of the ferrule and can therefore be removed easily, for example by scraping, this which does not cause loss of material of the ferrule. This low adhesion is due in particular to the absence of chemical interactions between the composite material of the shell and that of the particles, which is not the case with rolls of metallic material.

La virole d'un rouleau de l'installation de l'invention peut notamment être formée en un des matériaux composites suivants : matériau composite carbone-carbone (C-C) avec éventuellement sur sa surface externe une couche de carbure de silicium, matériau composite carbone-carbone/carbure de silicium (C-C/SiC) et matériau composite carbure de silicium-carbure de silicium (SiC-SiC).The ferrule of a roll of the plant of the invention may in particular be formed of one of the following composite materials: carbon-carbon composite material (CC) possibly having on its outer surface a layer of silicon carbide, a carbon-carbon composite material. carbon / silicon carbide (CC / SiC) and composite material silicon carbide-silicon carbide (SiC-SiC).

Selon une particularité de l'invention, chaque rouleau comprend au moins une fusée en matériau métallique et un élément de maintien de la virole sur chaque fusée, l'élément comprenant une couronne ou une pluralité de segments de couronne fixés sur une extrémité de la virole, chaque couronne ou segment de couronne étant prolongé par au moins une languette élastique dont l'extrémité est en appui sur la fusée. La liaison élastique ainsi réalisée entre la virole et les fusées permet de compenser les dilatations différentielles entre ces éléments aussi bien axialement que radialement.According to one particularity of the invention, each roll comprises at least one rocket made of metallic material and one element for holding the ferrule on each rocket, the element comprising a crown or a plurality of crown segments fixed on one end of the ferrule , each ring or ring segment being extended by at least one resilient tongue whose end is supported on the rocket. The elastic connection thus formed between the shell and the rockets makes it possible to compensate for the differential expansions between these elements, both axially and radially.

Selon une autre particularité de l'invention, chaque fusée comprend en outre un mandrin comportant une pluralité de dents et de cannelures, la virole comprenant elle aussi une pluralité de dents et de cannelures en prise respectivement avec les cannelures et les dents de chaque mandrin. Dans ce cas, on ménage de préférence un premier jeu radial à froid entre le sommet des dents de chaque mandrin et le fond des cannelures de la virole ainsi qu'un deuxième jeu radial à froid entre le sommet des dents de la virole et le fond des cannelures de chaque mandrin.According to another feature of the invention, each rocket further comprises a mandrel having a plurality of teeth and splines, the ferrule also comprising a plurality of teeth and splines respectively engaged with the grooves and the teeth of each mandrel. In this case, we prefer a first game cold radial between the top of the teeth of each mandrel and the bottom of the fluting of the ferrule and a second radial clearance cold between the top of the teeth of the shell and the bottom of the fluting of each mandrel.

Selon encore une autre particularité, chaque rouleau comprend en outre un élément annulaire de renfort placé autour de chaque couronne ou chaque pluralité de segments de couronne. L'élément annulaire de renfort permet d'assurer la fixation des couronnes sur la virole notamment vis-à-vis des forces centrifuges et des efforts auxquels peut être soumis le rouleau en fonctionnement (par exemple efforts de contact avec la bande). Chaque élément annulaire de renfort peut être formé d'un collier élastique en matériau métallique précontraint ou d'un collier ou d'une bague en un matériau présentant un coefficient de dilatation thermique identique ou légèrement supérieur au matériau des couronnes.According to yet another feature, each roller further comprises an annular reinforcing element placed around each ring or each plurality of ring segments. The annular reinforcement element makes it possible to ensure the fixing of the crowns on the ferrule in particular with respect to the centrifugal forces and the forces to which the roller may be subjected in operation (for example contact forces with the belt). Each annular reinforcing element may be formed of an elastic collar of prestressed metal material or of a collar or a ring of a material having a coefficient of thermal expansion identical to or slightly greater than the material of the rings.

Selon une variante de réalisation, chaque rouleau comprend un mandrin en matériau métallique prolongé à chaque extrémité par une fusée, le mandrin comportant une pluralité de dents et de cannelures. La virole est dans ce cas disposée autour du mandrin et comprend également une pluralité de dents et de cannelures en prise respectivement avec les cannelures et les dents du mandrin. Des premier et second jeux radiaux à froid sont de préférence ménagés entre, d'une part, le sommet des dents du mandrin et le fond des cannelures de la virole et, d'autre part, entre le sommet des dents de la virole et le fond des cannelures de chaque mandrin.According to an alternative embodiment, each roller comprises a mandrel of metal material extended at each end by a rocket, the mandrel comprising a plurality of teeth and splines. The ferrule is in this case arranged around the mandrel and also comprises a plurality of teeth and splines respectively engaged with the splines and the teeth of the mandrel. First and second radial clearances are preferably arranged between, on the one hand, the top of the teeth of the mandrel and the bottom of the flutes of the shell and, on the other hand, between the top of the teeth of the shell and the bottom of the grooves of each mandrel.

Selon une autre variante de réalisation, chaque rouleau comprend deux fusées fixées de chaque côté de la virole, chaque fusée étant prolongée par un arbre en matériau métallique, les arbres et les fusées ayant une surface de contact de forme tronconique.According to another embodiment, each roller comprises two fuses fixed on each side of the shell, each rocket being extended by a shaft of metallic material, the shafts and the rockets having a frustoconical contact surface.

Selon un aspect particulier de l'invention, le bain de métal fondu contient du zinc liquide pour la réalisation d'un traitement de galvanisation.According to a particular aspect of the invention, the molten metal bath contains liquid zinc for carrying out a galvanization treatment.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante de modes particuliers de réalisation de l'invention, donnés à titre d'exemples non limitatifs, en référence aux dessins annexés, sur lesquels :

  • la figure 1 est une vue schématique en coupe d'une installation de traitement de bandes métalliques par trempage conformément à l'invention,
  • la figure 2 est une vue schématique en perspective d'un rouleau d'une installation de traitement selon un mode de réalisation de l'invention ;
  • la figure 3 est une vue schématique en perspective d'un rouleau d'une installation de traitement selon un autre mode de réalisation de l'invention ;
  • la figure 4 est vue une éclatée du rouleau de la figure 3 ;
  • la figure 5 est une vue schématique d'un rouleau selon un autre mode de réalisation de l'invention ;
  • la figure 6 est une vue schématique d'un rouleau selon un autre mode de réalisation de l'invention ;
  • la figure 7 est vue une éclatée d'une partie du rouleau de la figure 6 montrant le montage d'une fusée à une extrémité du rouleau.
Other characteristics and advantages of the invention will emerge from the following description of particular embodiments of the invention, given by way of non-limiting examples, with reference to the appended drawings, in which:
  • the figure 1 is a diagrammatic sectional view of a metal strip treatment plant by dipping according to the invention,
  • the figure 2 is a schematic perspective view of a roll of a processing plant according to one embodiment of the invention;
  • the figure 3 is a schematic perspective view of a roll of a processing plant according to another embodiment of the invention;
  • the figure 4 is seen an exploded roll of the figure 3 ;
  • the figure 5 is a schematic view of a roll according to another embodiment of the invention;
  • the figure 6 is a schematic view of a roll according to another embodiment of the invention;
  • the figure 7 is seen an exploded part of the roll of the figure 6 showing the mounting of a rocket at one end of the roller.

Description détaillée d'un mode de réalisationDetailed description of an embodiment

L'invention s'applique d'une manière générale aux installations de traitement de bandes métalliques utilisant un ou plusieurs de bains de métal fondu dans lesquels la bande est trempée. Un domaine particulier, mais non exclusif, d'application de l'invention est celui des installations de galvanisation comprenant un ou plusieurs bains de zinc dans lesquels sont trempées des bandes d'acier pour être traitées.The invention is generally applicable to metal strip processing plants using one or more of molten metal baths in which the strip is quenched. A particular, but not exclusive, field of application of the invention is that of galvanizing plants comprising one or more zinc baths in which steel strips are hardened to be treated.

La figure 1 illustre une installation ou ligne de galvanisation en continu 10 qui comprend une cuve 11 remplie de zinc fondu 12 maintenu à une température de 450°C environ, le bain comprenant typiquement une teneur en aluminium de 0,20%. On réalise le trempage d'une bande d'acier 13 dans le bain en faisant circuler la bande entre une entrée 11a et une sortie 11b du bain suivant un parcours qui est défini au moyen de trois rouleaux 14, 15 et 16 immergés dans le bain de zinc.The figure 1 illustrates a continuous galvanizing plant or line 10 which comprises a tank 11 filled with molten zinc 12 maintained at a temperature of about 450 ° C., the bath typically comprising an aluminum content of 0.20%. Soaking a steel strip 13 in the bath by circulating the strip between an inlet 11a and an outlet 11b of the bath along a path that is defined by means of three rollers 14, 15 and 16 immersed in the bath of zinc.

Conformément à l'invention, l'installation de traitement comprend un ou plusieurs rouleaux, tels que les rouleaux 14, 15 et 16 illustrés dans la figure 1, dont la partie destinée à être en contact avec la bande à traiter, à savoir la virole, est réalisée en matériau composite formé d'un renfort en fibres de carbone ou céramique densifié par une matrice qui peut être partiellement ou totalement carbone ou céramique.According to the invention, the treatment plant comprises one or more rollers, such as the rollers 14, 15 and 16 illustrated in FIG. figure 1 , whose part intended to be in contact with the band to be treated, namely the ferrule, is made of a composite material formed of a reinforcement of carbon fibers or ceramic densified by a matrix which may be partially or completely carbon or ceramic.

La virole peut être notamment réalisée en matériau composite carbone-carbone (C-C) qui, de façon connue, est un matériau formé d'un renfort en fibres de carbone densifié par une matrice en carbone ou en matériau composite à matrice céramique (CMC) qui est un matériau formé d'un renfort en fibres de carbone ou céramique densifié par une matrice au moins partiellement céramique. La virole peut être notamment formée en un des matériaux composite CMC suivants :

  • carbone-carbone/carbure de silicium (C-C/SiC) correspondant à un matériau formé d'un renfort en fibres de carbone et densifié par une matrice comprenant une phase carbone et une phase carbure de silicium,
  • carbone-carbure de silicium (C-SiC) qui est un matériau formé d'un renfort en fibres de carbone densifié par une matrice en carbure de silicium,
  • carbure de silicium-carbure de silicium (SiC/SiC) correspondant à un matériau formé d'un renfort en fibres de carbure de silicium densifié par une matrice en carbure de silicium.
The ferrule may in particular be made of a carbon-carbon composite material (CC) which, in known manner, is a material formed of a carbon fiber reinforcement densified by a carbon matrix or a ceramic matrix composite material (CMC) which is a material formed of a reinforcement of carbon or ceramic fibers densified by an at least partially ceramic matrix. The ferrule may be formed in particular of one of the following CMC composite materials:
  • carbon-carbon / silicon carbide (CC / SiC) corresponding to a material formed of a carbon fiber reinforcement and densified by a matrix comprising a carbon phase and a silicon carbide phase,
  • carbon-carbon carbide (C-SiC) which is a material formed of a reinforcement of carbon fibers densified by a silicon carbide matrix,
  • silicon carbide-silicon carbide (SiC / SiC) corresponding to a material formed of a reinforcement of silicon carbide fibers densified by a silicon carbide matrix.

La virole en matériau composite peut être en outre recouverte d'une couche de carbure de silicium.The shell of composite material may be further covered with a layer of silicon carbide.

La fabrication de pièces en matériau composite constituées d'un renfort fibreux densifié par une matrice est bien connue. Elle comprend principalement la réalisation d'une structure fibreuse, ici en fibres de carbone ou céramique, la mise en forme de la structure dans une forme voisine de celle de la pièce à fabriquer (préforme fibreuse) et la densification de la préforme par la matrice.The manufacture of composite material parts consisting of a fiber reinforcement densified by a matrix is well known. It mainly comprises the production of a fibrous structure, here made of carbon or ceramic fibers, the shaping of the structure in a shape similar to that of the part to be manufactured (fibrous preform) and the densification of the preform by the matrix. .

La structure fibreuse constitue le renfort de la pièce dont le rôle est essentiel vis-à-vis des propriétés mécaniques. En particulier, la structure fibreuse doit être une structure cohérente pour conférer au matériau composite un caractère structural qui permet d'obtenir une virole autoporteuse. Par structure ou renfort fibreux cohérent, on entend ici un renfort ou une structure capable de conserver sa cohésion lors de manipulations par opposition aux fibres mélangées sous forme dispersée, c'est-à-dire de manière non cohérente, dans un matériau tel qu'une céramique. En effet, dans ce dernier cas, les fibres correspondent à des charges et ne constituent pas un renfort fibreux cohérent au sens de la présente invention.The fibrous structure is the reinforcement of the part whose role is essential vis-à-vis the mechanical properties. In particular, the fibrous structure must be a coherent structure to give the composite material a structural character which makes it possible to obtain a self-supporting ferrule. By structure or coherent fibrous reinforcement is meant here a reinforcement or a structure capable of maintaining its cohesion during handling as opposed to the mixed fibers in dispersed form, that is to say in a non-coherent manner, in a material such as a ceramic. Indeed, in the latter case, the fibers correspond to fillers and do not constitute a coherent fibrous reinforcement within the meaning of the present invention.

La structure fibreuse cohérente est obtenue à partir de textures fibreuses en fibres de carbone ou céramique. Les textures fibreuses utilisées peuvent être de diverses natures et formes telles que notamment:

  • tissu bidimensionnel (2D),
  • tissu tridimensionnel (3D) obtenu par tissage 3D ou multicouches,
  • tresse,
  • tricot,
  • feutre,
  • nappe unidirectionnelle (UD) de fils ou câbles ou nappes multidirectionnelle (nD) obtenue par superposition de plusieurs nappes UD dans des directions différentes et liaison des nappes UD entre elles par exemple par couture, par agent de liaison chimique ou par aiguilletage.
The coherent fibrous structure is obtained from fibrous textures of carbon or ceramic fibers. The fibrous textures used may be of various natures and forms such as, in particular:
  • two-dimensional fabric (2D),
  • three-dimensional fabric (3D) obtained by 3D or multilayer weaving,
  • braided,
  • knitting,
  • felt,
  • unidirectional web (UD) son or cables or multidirectional webs (nD) obtained by superposition of several UD webs in different directions and UD web bonding between them for example by sewing, by chemical bonding agent or by needling.

On peut aussi utiliser une structure fibreuse formée de plusieurs couches superposées de tissu, tresse, tricot, feutre, nappes, câbles ou autres, lesquelles couches sont liées entre elles par exemple par couture, par implantation de fils ou d'éléments rigides ou par aiguilletage.It is also possible to use a fibrous structure formed of several superimposed layers of fabric, braid, knit, felt, plies, cables or others, which layers are bonded together, for example by sewing, by implantation of threads or rigid elements or by needling. .

La mise en forme est réalisée par bobinage filamentaire, enroulage de nappe UD sur un mandrin, tissage, empilage, aiguilletage de strates bidimensionnelles/tridimensionnelles ou de nappes de câbles, etc.The shaping is performed by filament winding, UD web winding on a mandrel, weaving, stacking, needling of two-dimensional / three-dimensional strata or plies of cables, etc.

La préforme fibreuse est ensuite densifiée, de façon bien connue, par voie liquide et/ou gazeuse.The fiber preform is then densified, in a well-known manner, by liquid and / or gaseous means.

La densification par voie liquide consiste à imprégner la préforme par une composition liquide contenant un précurseur du matériau de la matrice. Le précurseur se présente habituellement sous forme d'un polymère, tel qu'une résine, éventuellement dilué dans un solvant. La transformation du précurseur en carbone ou céramique est réalisée par traitement thermique, après élimination du solvant éventuel et réticulation du polymère. Plusieurs cycles d'imprégnation successifs peuvent être réalisés pour parvenir au degré de densification souhaité.Liquid densification comprises impregnating the preform with a liquid composition containing a precursor of the matrix material. The precursor is usually in the form of a polymer, such as a resin, optionally diluted in a solvent. The transformation of the precursor into carbon or ceramic is carried out by heat treatment after removal of the optional solvent and crosslinking of the polymer. Several successive impregnation cycles can be performed to achieve the desired degree of densification.

Une résine précurseur de carbone peut être par exemple une résine de type phénolique.A carbon precursor resin may for example be a phenolic type resin.

Une résine précurseur de céramique peut être par exemple une résine polycarbosilane précurseur de carbure de silicium (SiC), ou une résine polysiloxane précurseur de SiCO, ou une résine polyborocarbosilazane précurseur de SiCNB, ou une résine polysilazane (SiCN).A ceramic precursor resin may be, for example, a polycarbosilane precursor resin of silicon carbide (SiC), or a polysiloxane resin precursor of SiCO, or a polyborocarbosilazane resin precursor of SiCNB, or a polysilazane resin (SiCN).

Dans le cas d'un matériau C-C/SiC, la préforme fibreuse est d'abord imprégnée avec une résine précurseur de la phase carbone de la matrice, telle qu'une résine de type phénolique, puis d'une résine précuseur de SiC, telle qu'une résine polycarbosilane. Après imprégnation, une préforme fibreuse destinée à constituer le renfort fibreux de la pièce à réaliser, et ayant une forme correspondant sensiblement à celle de cette pièce, est maintenue en forme par conformation de la texture fibreuse à l'aide d'un outillage de maintien. La mise en forme de la préforme fibreuse peut être accompagnée d'un compactage de la structure fibreuse afin d'augmenter le taux volumique de fibres dans le matériau composite de la pièce à réaliser. Après mise en forme de la préforme, la réticulation de la résine est réalisée, ou achevée s'il y a eu pré-réticulation, la préforme étant dans un outillage. La résine polymérisée est alors transformée en carbone par traitement thermique. Après la formation de cette phase carbone de la matrice, la préforme fibreuse est ensuite imprégnée avec une résine précurseur de céramique. Après polymérisation, la résine est traitée thermiquement pour être transformée en céramique. En général, aucun outillage de maintien de l'ébauche n'est nécessaire, celle-ci étant suffisamment solidifiée par la matrice carbone précédemment déposée.In the case of a CC / SiC material, the fibrous preform is first impregnated with a precursor resin of the carbon phase of the matrix, such as a phenolic type resin, and then an SiC precursor resin, such as than a polycarbosilane resin. After impregnation, a fibrous preform intended to constitute the fibrous reinforcement of the part to be produced, and having a shape substantially corresponding to that of this part, is maintained in shape by conformation of the fibrous texture by means of a holding tooling . The shaping of the fibrous preform may be accompanied by a compacting of the fibrous structure in order to increase the volume content of fibers in the composite material of the part to be produced. After forming the preform, the crosslinking of the resin is performed, or completed if there has been pre-crosslinking, the preform being in a tool. The polymerized resin is then converted into carbon by heat treatment. After formation of this carbon phase of the matrix, the fibrous preform is then impregnated with a ceramic precursor resin. After polymerization, the resin is heat treated to be converted into ceramic. In general, no tools for maintaining the blank are necessary, the latter being sufficiently solidified by the previously deposited carbon matrix.

Les opérations d'imprégnation et de polymérisation de résine précurseur de carbone et/ou de résine précurseur de céramique peuvent être répétées plusieurs fois si nécessaire pour obtenir des caractéristiques mécaniques déterminées.The impregnation and polymerization operations of carbon precursor resin and / or ceramic precursor resin can be repeated several times if necessary to obtain specific mechanical characteristics.

La densification de la préforme fibreuse peut-être également réalisée, de façon connue, par voie gazeuse par infiltration chimique en phase vapeur de la matrice (CVI). La préforme fibreuse correspondant à la structure à réaliser est placée dans un four dans lequel est admise une phase gazeuse réactionnelle. La pression et la température régnant dans le four et la composition de la phase gazeuse sont choisies de manière à permettre la diffusion de la phase gazeuse au sein de la porosité de la préforme pour y former la matrice par dépôt, au coeur du matériau au contact des fibres, d'un matériau solide résultant d'une décomposition d'un constituant de la phase gazeuse ou d'une réaction entre plusieurs constituants, contrairement aux conditions de pression et températures propres aux procédés CVD ("Chemical Vapor Déposition") qui conduisent exclusivement à un dépôt à la surface du matériau.The densification of the fiber preform may also be carried out, in a known manner, by gaseous method by chemical vapor infiltration of the matrix (CVI). The fiber preform corresponding to the structure to be produced is placed in an oven in which a gaseous reaction phase is admitted. The pressure and the temperature prevailing in the furnace and the composition of the gas phase are chosen so as to allow the diffusion of the gas phase within the porosity of the preform to form the matrix by deposition, in the heart of the material in contact with it. fibers, of a solid material resulting from a decomposition of a constituent of the gas phase or a reaction between several constituents, unlike the pressure conditions and temperatures specific to the CVD ("Chemical Vapor Deposition") processes which lead to exclusively to a deposit on the surface of the material.

La formation d'une matrice carbone peut être obtenue avec des gaz hydrocarbures tels que méthane et/ou propane donnant le carbone par craquage tandis qu'une matrice SiC peut être obtenue avec du méthyltrichlorosilane (MTS) donnant du SiC par décomposition du MTS.The formation of a carbon matrix can be achieved with hydrocarbon gases such as methane and / or propane giving the carbon by cracking while an SiC matrix can be obtained with methyltrichlorosilane (MTS) giving SiC by decomposition of the MTS.

Dans le cas d'un matériau C-C/SiC, la première phase carbone peut être formée avec des gaz hydrocarbures donnant le carbone par craquage, la deuxième phase SiC étant ensuite déposée sur la première phase carbone, par exemple par décomposition du MTS.In the case of a C-C / SiC material, the first carbon phase can be formed with hydrocarbon gases giving the carbon by cracking, the second SiC phase then being deposited on the first carbon phase, for example by decomposition of the MTS.

Une densification combinant voie liquide et voie gazeuse peut être également utilisée pour faciliter la mise en oeuvre, limiter les coûts et les cycles de fabrication tout en obtenant des caractéristiques satisfaisantes pour l'utilisation envisagée.A densification combining liquid route and gaseous route can also be used to facilitate implementation, limit costs and production cycles while obtaining satisfactory characteristics for the intended use.

Comme illustré sur la figure 2, un rouleau 50 conforme à l'invention peut être constitué d'une simple virole 51 réalisée en un matériau composite comme décrit ci-avant et maintenue dans le bain par des paliers internes ou externes fixés sur les parois de la cuve (non représentés sur la figure 2). La virole 51 est autoporteuse en ce qu'elle présente une structure suffisamment résistante pour supporter les efforts auxquels est soumis le rouleau sans support intérieur.As illustrated on the figure 2 a roller 50 according to the invention may consist of a simple ferrule 51 made of a composite material as described above and kept in the bath by internal or external bearings fixed on the walls of the tank (not shown on the figure 2 ). The ferrule 51 is self-supporting in that it has a structure sufficiently strong to withstand the forces to which the roller is subjected without inner support.

Selon une variante de réalisation illustrée sur les figures 3 et 4, un rouleau 100 conforme à l'invention comprend une virole 120 réalisée en un matériau composite comme décrit ci-avant et deux fusées 130 et 140 montées à chacune des extrémités de la virole 120 et destinés à être supportés par des paliers présents sur les parois de la cuve contenant le bain de métal fondu (non représentés sur les figures 3 et 4). Les fusées 130 et 140 sont réalisées en matériau métallique, par exemple en acier du type Inox. Chaque fusée 130, respectivement 140, comprend un mandrin 131, respectivement 141, une portion tronconique 132, respectivement 142, qui est prolongée par un arbre 133, respectivement 143.According to an embodiment variant illustrated on the figures 3 and 4 , a roll 100 according to the invention comprises a shell 120 made of a composite material as described above and two rockets 130 and 140 mounted at each end of the shell 120 and intended to be supported by bearings on the walls of the tank containing the molten metal bath (not shown on the figures 3 and 4 ). The flares 130 and 140 are made of metal material, for example steel of the stainless steel type. Each rocket 130, respectively 140, comprises a mandrel 131, respectively 141, a frustoconical portion 132, respectively 142, which is extended by a shaft 133, respectively 143.

Comme illustrée sur la figure 4, la fusée 130 comprend une série de cannelures 1310 réparties de façon annulaire sur la surface externe du mandrin 131 et délimitant une série de dents 1320. De même, le mandrin 141 de la fusée 140 comporte une série de cannelures 1410 uniformément réparties sur la surface externe de ce dernier et délimitant une série de dents 1420.As illustrated on the figure 4 the rocket 130 comprises a series of splines 1310 annularly distributed on the outer surface of the mandrel 131 and delimiting a series of teeth 1320. Similarly, the mandrel 141 of the rocket 140 comprises a series of splines 1410 uniformly distributed over the surface external of the latter and delimiting a series of teeth 1420.

La virole 120 comporte des cannelures 1210 et des dents 1220 réparties de façon annulaire sur sa surface interne et destinées à être engagées avec les dents 1320 et 1420 et les cannelures 1310 et 1410 respectivement des fusées 130 et 140. Les cannelures 1210 peuvent être directement formées lors de la fabrication de la pièce en matériau composite par conformation du renfort fibreux ou après la fabrication de la pièce en usinant sa surface interne.The shell 120 has splines 1210 and teeth 1220 annularly distributed on its inner surface and intended to be engaged with the teeth 1320 and 1420 and the splines 1310 and 1410 respectively of the flares 130 and 140. The flutes 1210 may be directly formed during the manufacture of the composite material part by conformation of the fibrous reinforcement or after manufacture of the workpiece by machining its inner surface.

Afin d'accommoder la différence des coefficients de dilatation thermique entre le matériau métallique des fusées et le matériau composite de la virole, un jeu radial à « froid », c'est-à-dire un jeu seulement présent lorsque le rouleau est à température ambiante, peut être ménagé entre le sommet des dents de chaque mandrin et le fond des cannelures de la virole, d'une part, et entre le sommet des dents de la virole et le fond des cannelures de chaque mandrin, d'autre part.In order to accommodate the difference in the coefficients of thermal expansion between the metallic material of the rockets and the composite material of the shell, a radial clearance "cold", that is to say a game only present when the roller is at temperature ambient, may be provided between the top of the teeth of each mandrel and the bottom of the fluting of the shell, on the one hand, and between the top of the teeth of the shell and the bottom of the flutes of each mandrel, on the other.

La virole 120 peut en outre être bridée en translation sur les fusées 130 et 140 au moyen d'éléments de maintien élastiques 150 et 160 disposés à chaque extrémité de la virole 120 et chacun formés, dans l'exemple décrit ici, de deux segments de couronne 151 et 152, respectivement 161 et 162 prolongés par des languettes ou pattes élastiques 153, respectivement 163. Chaque segment de couronne 151, 152, 161 et 162 peut être formé à partir d'une pièce métallique conformée et usinée de manière à former les languettes élastiques 153 et 163.The shell 120 can also be clamped in translation on the flares 130 and 140 by means of elastic holding elements 150 and 160 disposed at each end of the shell 120 and each formed, in the example described here, of two crown segments 151 and 152, respectively 161 and 162 extended by tongues or elastic tabs 153, respectively 163. Each ring segment 151, 152, 161 and 162 can be formed from a metal piece shaped and machined to form the resilient tongues 153 and 163.

Les éléments de maintien élastiques 150 et 160, à savoir dans le mode de réalisation décrit ici les segments de couronne 151, 152 et 161, 162, sont fixés respectivement aux deux extrémités 120a et 120b de la virole 120 tandis que les languettes élastiques de ces éléments exercent une pression de maintien respectivement sur la portion tronconique 132 de la fusée 130 et sur la portion tronconique 142 de la fusée 140.The elastic holding elements 150 and 160, namely in the embodiment described here the ring segments 151, 152 and 161, 162, are respectively fixed to the two ends 120a and 120b of the shell 120 while the elastic tabs of these elements exert a holding pressure respectively on the frustoconical portion 132 of the rocket 130 and on the frustoconical portion 142 of the rocket 140.

Comme illustré sur les figures 3 et 4, le rouleau 100 comprend en outre deux éléments annulaires de renfort 156 et 166 disposés respectivement autour des segments de couronne 151, 152 et 161, 162. Dans l'exemple présenté ici, chaque élément annulaire de renfort 156, respectivement 166, est constitué d'un collier ou bague élastique 1560, respectivement 1660, réalisé à partir d'une bande de feuillard métallique, par exemple en acier à hautes caractéristiques élastiques. Chaque collier élastique est monté en précontrainte sur les segments de couronne correspondants.As illustrated on figures 3 and 4 , the roll 100 further comprises two annular reinforcing elements 156 and 166 disposed respectively around the ring segments 151, 152 and 161, 162. In the example presented here, each annular reinforcement element 156, 166 respectively, consists of an elastic collar or ring 1560, respectively 1660, made from a strip of metal strip, for example steel with high elastic characteristics. Each elastic collar is preloaded on the corresponding ring segments.

Dans une variante de réalisation, l'élément annulaire de renfort peut être formé d'un collier ou bague fendu monté en précontrainte sur les couronnes, le collier ou la bague étant réalisé en matériau métallique (par exemple en acier). Dans ce cas, les extrémités de chaque collier ne se chevauchent pas mais s'écartent plus ou moins l'une de l'autre suivant les températures rencontrées.In an alternative embodiment, the annular reinforcing element may be formed of a collar or split ring preloaded on the rings, the collar or the ring being made of metal material (for example steel). In this case, the ends of each collar do not overlap but deviate more or less from each other according to the temperatures encountered.

Selon encore une autre variante de réalisation, l'élément de renfort peut être formé d'un collier ou bague réalisé en un matériau ayant un coefficient de dilatation thermique similaire ou très légèrement supérieur à celui du matériau des couronnes. Dans ce cas, il n'est pas nécessaire de prévoir la possibilité d'une déformation élastique pour l'élément de maintien en raison de l'absence de dilatations différentielles entre les couronnes et l'élément annulaire de renfort.According to yet another alternative embodiment, the reinforcing element may be formed of a collar or ring made of a material having a coefficient of thermal expansion similar to or slightly greater than that of the material of the rings. In this case, it is not necessary to provide the possibility of elastic deformation for the holding element due to the absence of differential expansions between the rings and the annular reinforcing element.

D'autres dispositifs tels que des colliers de type "serflex" peuvent être envisagés.Other devices such as "serflex" type collars may be envisaged.

Les éléments de maintien élastiques 150 et 160 permettent de maintenir de façon équilibrée la virole 120 en position longitudinale sur les portions tronconiques 132 et 142 des fusées 130 et 140 tout en absorbant les variations axiales dues aux dilatations thermiques différentielles entre les fusées et la virole. Lors de montées en température, les fusées 130 et 140 se dilatent tandis que a virole 120 conserve son volume en raison de son faible coefficient de dilatation. Toutefois, grâce aux portions tronconiques 132 et 142 et les languettes élastiques 153 et 163 en appui sur ces dernières, les dilatations des fusées n'entraînent pas de déformation de a virole. En effet, lors de la dilatation des fusées, les languettes élastiques se déforment légèrement et glissent sur les portions tronconiques des fusées avec lesquelles elles sont en contact et assurent ainsi un maintien en position axiale de la virole tout en compensant les dilatations différentielles. Lors du refroidissement, c'est-à-dire lors de la rétractation des fusées, le maintien axial de la virole est toujours assuré grâce au retour élastique des languettes.The elastic holding elements 150 and 160 make it possible to maintain the shell 120 in a longitudinal position in a balanced position on the frustoconical portions 132 and 142 of the flares 130 and 140 while absorbing the axial variations due to the differential thermal expansions between the flares and the ferrule. When rising in temperature, the flares 130 and 140 expand while the shell 120 retains its volume because of its low coefficient of expansion. However, thanks to the frustoconical portions 132 and 142 and the resilient tabs 153 and 163 resting on them, the expansion of the rockets do not cause deformation of a ferrule. Indeed, during the expansion of the rockets, the elastic tongues deform slightly and slide on the frustoconical portions of the rockets with which they are in contact and thus maintain the axial position of the ferrule while compensating for differential expansion. During cooling, that is to say during the retraction of the rockets, the axial retention of the ferrule is always ensured by the elastic return of the tongues.

Les éléments de maintien élastiques de l'invention ne sont pas limités à une structure formée de deux segments de couronne. Ces derniers peuvent être peuvent être par exemple formés d'une seule couronne comportant des languettes élastiques réparties uniformément autour d'une extrémité de ladite couronne ou de quatre segments de couronne comportant chacun des languettes élastiques.The elastic holding members of the invention are not limited to a structure formed of two ring segments. These may be may for example be formed of a single ring having resilient tongues distributed uniformly around one end of said ring or four ring segments each having resilient tongues.

La figure 5 illustre un rouleau 300 conformément à un autre mode de réalisation d'un rouleau selon l'invention.The figure 5 illustrates a roller 300 according to another embodiment of a roller according to the invention.

Le rouleau 300 comprend un mandrin 310 dont chaque extrémité est prolongée par une fusée 311, respectivement 312. Le rouleau 300 comprend en outre une virole 320 réalisée conformément à l'invention en matériau composite comme décrit ci-avant. La virole 320 est en outre bridée en translation sur le mandrin 310 au moyen d'éléments de maintien élastiques 316 disposés à chaque extrémité de la virole 320. Comme illustrée sur la figure 5, la virole 320 présente sur sa surface interne des dents 3210 et 3220 engagés dans des cannelures 313 formées sur la surface externe du mandrin 410, par exemple par usinage. La virole 320 est positionnée autour du mandrin 310 en ménageant un jeu radial à froid entre les surfaces en regard de ces deux éléments afin de compenser à chaud les dilatations différentielles entre ces deux éléments.The roll 300 comprises a mandrel 310, each end of which is extended by a spindle 311, respectively 312. The roll 300 further comprises a ferrule 320 made according to the invention made of composite material as described above. The ferrule 320 is further clamped in translation on the mandrel 310 by means of resilient retaining elements 316 disposed at each end of the shell 320. As illustrated in FIG. figure 5 , the ferrule 320 has on its inner surface teeth 3210 and 3220 engaged in splines 313 formed on the outer surface of the mandrel 410, for example by machining. The shell 320 is positioned around the mandrel 310 by providing a radial clearance to cold between the surfaces facing these two elements to compensate for hot differential expansion between these two elements.

On décrit maintenant en relation avec les figures 6 et 7, un autre mode de réalisation d'un rouleau selon l'invention. Les figures 6 et 7 illustrent un rouleau 200 qui diffère notamment du rouleau 200 décrit précédemment en ce qu'il comprend une virole 220 réalisée en un matériau composite tel que décrit ci-avant et qui est autoporteuse, c'est-à-dire qui présente, comme la virole 51 décrite ci-avant, une structure suffisamment résistante pour supporter les efforts auxquels est soumis le rouleau sans support intérieur. Le rouleau 200 comprend deux fusées 213 et 214 respectivement reliées à la virole 220 et réalisées en un même matériau composite que la virole 220. Plus précisément, comme représenté sur la figure 7, la fusée 214 comprend à son extrémité de grand diamètre un filetage 2141 destiné à coopérer avec un filetage 2210 réalisé sur la paroi interne de la virole 220. La fusée 214 est vissé sur la virole 220 puis solidarisée avec cette dernière par une goupille 224 fixée dans des orifices 2211 et 2140 formés respectivement dans la virole 220 et dans la fusée 214. Il en est de même pour la fixation de la fusée 213 à la virole 220.We now describe in relation to the Figures 6 and 7 , another embodiment of a roller according to the invention. The Figures 6 and 7 illustrate a roller 200 which differs in particular from the roller 200 described above in that it comprises a ferrule 220 made of a composite material as described above and which is self-supporting, that is to say which has, like the ferrule 51 described above, a sufficiently strong structure to withstand the forces to which the roller is subjected without inner support. The roller 200 comprises two fuses 213 and 214 respectively connected to the ferrule 220 and made of the same composite material as the shell 220. More specifically, as shown in FIG. figure 7 , the rocket 214 comprises at its end of large diameter a thread 2141 intended to cooperate with a thread 2210 formed on the inner wall of the shell 220. The rocket 214 is screwed onto the shell 220 and secured thereto by a pin 224 fixed in orifices 2211 and 2140 respectively formed in the shell 220 and in the rocket 214. It is the same for the attachment of the rocket 213 to the shell 220.

Chaque fusée 213, respectivement 214, est munie d'un arbre 211, respectivement 212 réalisé en matériau métallique. Plus précisément, comme illustré sur la figure 7, l'arbre 212 présente à une extrémité une portion évasée 2120 qui joue le rôle de butée et, à l'autre extrémité, une portion filetée 2122 et une rainure 2123 dépassant à l'extérieur de la fusée 214. L'arbre 212 est solidarisé en rotation avec la fusée 214, par exemple, par un crabot 215 qui est engagé à la fois avec la rainure 2123 de l'arbre 212 et avec un ergot 2142 de la fusée 214. Le serrage du crabot 215 ainsi que de l'arbre 212 est assuré par deux écrous 216 coopérant avec le filetage 2122 de l'arbre. Il en est de même pour le montage et la solidarisation de l'arbre 211 sur la fusée 213.Each fuse 213, respectively 214, is provided with a shaft 211, respectively 212 made of metallic material. More specifically, as illustrated on the figure 7 , the shaft 212 has at one end a flared portion 2120 which acts as a stop and, at the other end, a threaded portion 2122 and a groove 2123 protruding outside the rocket 214. The shaft 212 is secured in rotation with the rocket 214, for example, by a clutch 215 which is engaged both with the groove 2123 of the shaft 212 and with a lug 2142 of the rocket 214. The clamping of the clutch 215 as well as the shaft 212 is provided by two nuts 216 cooperating with the thread 2122 of the shaft. It is the same for the mounting and securing of the shaft 211 on the rocket 213.

Grâce aux éléments tronconiques, les dilatations des arbres n'entraînent pas de déformation de la virole cylindrique. En effet, les surfaces de contact entre les arbres et les éléments tronconiques ont chacune un centre de symétrie (génératrice) qui coïncide avec l'axe de la virole et, par conséquent, du rouleau. Comme les arbres se dilatent à la fois radialement et axialement, leur augmentation de volume se fait vers l'intérieur des fusées qui présentent un volume interne croissant en raison de leur forme tronconique. Ainsi, la dilatation des arbres n'entraîne pas de déformation de la virole.Thanks to the frustoconical elements, the dilations of the shafts do not cause deformation of the cylindrical shell. Indeed, the contact surfaces between the shafts and the frustoconical elements each have a center of symmetry (generator) which coincides with the axis of the shell and, therefore, the roller. As the trees expand at the Both radially and axially, their increase in volume is inward rockets that have an increasing internal volume because of their frustoconical shape. Thus, the expansion of the trees does not cause deformation of the ferrule.

Des moyens permettant au volume interne de la virole de se remplir du métal du bain sont prévus le cas échéant afin de faciliter l'immersion et le maintien du rouleau dans le bain. Ces moyens peuvent par exemple correspondre à des évents ou ouvertures ménagés sur les fusées des rouleaux permettant de faire communiquer le volume interne du rouleau avec l'extérieur, c'est-à-dire le métal fondu du bain.Means allowing the internal volume of the ferrule to fill with the metal of the bath are provided where appropriate to facilitate immersion and maintenance of the roll in the bath. These means may for example correspond to vents or openings on the rockets of the rollers for communicating the internal volume of the roll with the outside, that is to say the molten metal bath.

La Titulaire a réalisé des essais consistant à immerger dans différents bains de galvanisation des éprouvettes réalisées dans les mêmes matériaux composites que ceux décrits ci-avant pour la fabrication de la virole du ou des rouleaux de l'installation selon l'invention. Ces essais ont été réalisés des bains de galvanisation maintenu à une température d'environ 450°C et composé majoritairement de zinc fondu avec une teneur en aluminium variable suivant les bains, du fer étant apporté dans le bain lors du trempage des bandes.The Holder has carried out tests consisting in immersing in different plating baths specimens made of the same composite materials as those described above for the manufacture of the shell of the roll or rolls of the installation according to the invention. These tests were carried out galvanizing baths maintained at a temperature of about 450 ° C and composed mainly of molten zinc with a variable aluminum content in the baths, iron being brought into the bath during dipping strips.

Le premier essai a consisté à tremper pendant plusieurs jours consécutifs dans les bains décrits ci-avant des éprouvettes réalisées en matériau carbone-carbone/carbure de silicium (C-C/SiC), à savoir une pièce formée d'un renfort en fibres de carbone et densifié par une matrice comprenant une phase carbone et une phase carbure de silicium. Après plusieurs jours d'immersion dans le bain, l'éprouvette ne comportait pratiquement aucune particule solide intermétallique sur sa surface.The first test consisted of dipping for several consecutive days in the baths described above specimens made of carbon-carbon / silicon carbide (CC / SiC) material, namely a piece formed of a carbon fiber reinforcement and densified by a matrix comprising a carbon phase and a silicon carbide phase. After several days of immersion in the bath, the test tube had practically no intermetallic solid particles on its surface.

Des résultats très similaires ont également été obtenus avec des éprouvettes réalisées matériau composite carbone-carbone, c'est-à-dire une pièce formée d'un renfort en fibres de carbone densifié par une matrice carbone.Very similar results were also obtained with test pieces made of carbon-carbon composite material, that is to say a part formed of a carbon fiber reinforcement densified by a carbon matrix.

Par conséquent, l'utilisation de rouleaux dont au moins la virole est en matériau composite formé d'un renfort en fibres de carbone ou céramique densifié par une matrice au moins partiellement carbone dans des bains de métal fondu d'une installation de traitement permet de réduire considérablement la fréquence des opérations de maintenance ou de remplacement des rouleaux liées à la formation de particules solides intermétalliques (« dross ») sur la surface de ces derniers et d'accroître, par conséquent, la productivité de l'installation.Therefore, the use of rollers of which at least the ferrule is made of a composite material formed of a reinforcement of carbon or ceramic fibers densified by an at least partially carbon matrix in molten metal baths of a treatment plant makes it possible to significantly reduce the frequency of maintenance or roll replacement operations related to solid particle formation intermetallic ("dross") on the surface of the latter and thus increase the productivity of the installation.

Claims (15)

Installation de traitement (10) comprenant un bain (11) de métal fondu (12) dans lequel une bande métallique (13) est destinée à être trempée et au moins un rouleau (50) partiellement ou totalement immergé dans ledit bain, ledit rouleau comprenant au moins une virole (51) destinée à être en contact avec la bande métallique (13) à traiter,
caractérisée en ce qu'au moins ladite virole (51) est en matériau composite formé d'un renfort en fibres de carbone ou céramique densifié par une matrice au moins partiellement carbone ou céramique.A treatment plant (10) comprising a bath (11) of molten metal (12) in which a metal strip (13) is to be quenched and at least one roll (50) partially or totally immersed in said bath, said roll comprising at least one ferrule (51) intended to be in contact with the metal strip (13) to be treated,
characterized in that at least said ferrule (51) is made of a composite material formed of a reinforcement of carbon or ceramic fibers densified by an at least partially carbon or ceramic matrix. Installation selon la revendication 1, caractérisée en ce que la virole est réalisée en matériau composite carbone-carbone/carbure de silicium (C-C/SiC).Installation according to claim 1, characterized in that the shell is made of carbon-carbon composite material / silicon carbide (CC / SiC). Installation selon la revendication 1, caractérisée en ce que la virole est réalisée en matériau composite carbone-carbone (C-C).Installation according to claim 1, characterized in that the shell is made of carbon-carbon composite material (CC). Installation selon la revendication 3, caractérisée en ce que la virole comprend sur sa surface externe une couche de carbure de silicium.Installation according to claim 3, characterized in that the shell comprises on its outer surface a layer of silicon carbide. Installation selon la revendication 1, caractérisée en ce que la virole est réalisée en matériau composite carbure de silicium-carbure de silicium (SiC-SiC).Installation according to claim 1, characterized in that the ferrule is made of composite material silicon carbide-silicon carbide (SiC-SiC). Installation selon l'une quelconque des revendications 1 à 5, caractérisée en ce que chaque rouleau (100) comprend au moins une fusée (130) en matériau métallique et au moins un élément de maintien (150) de la virole sur chaque fusée, ledit élément comprenant une couronne ou une pluralité de segments de couronne (151, 152) fixés sur une extrémité de la virole (120), chaque couronne ou segment de couronne (151 ; 152) étant prolongé par au moins une languette élastique (153) dont l'extrémité est en appui sur la fusée (130).Installation according to any one of claims 1 to 5, characterized in that each roller (100) comprises at least one rocket (130) of metal material and at least one holding element (150) of the ferrule on each rocket, said an element comprising a ring or a plurality of ring segments (151, 152) fixed on one end of the shell (120), each ring or ring segment (151; 152) being extended by at least one resilient tongue (153) of which the end is supported on the rocket (130). Installation selon la revendication 6, caractérisée en ce que chaque fusée (130) comprend en outre un mandrin (13) comportant une pluralité de dents (1320) et de cannelures (1310) et en ce que la virole (120) comprend une pluralité de dents (1220) et de cannelures (1210) en prise respectivement avec les cannelures et les dents de chaque mandrin.Installation according to claim 6, characterized in that each fuse (130) further comprises a mandrel (13) having a plurality of teeth (1320) and flutes (1310) and in that the ferrule (120) comprises a plurality of teeth (1220) and splines (1210) respectively engaged with the splines and the teeth of each mandrel. Installation selon la revendication 7, caractérisée en ce qu'un premier jeu radial à froid est ménagé entre le sommet des dents (1320) de chaque mandrin (131) et le fond des cannelures (1210) de la virole (120) et en ce qu'un deuxième jeu radial à froid est ménagé entre le sommet des dents (1220) de la virole (120) et le fond des cannelures (1310) de chaque mandrin (130).Installation according to claim 7, characterized in that a first radial clearance is formed between the top of the teeth (1320) of each mandrel (131) and the bottom of the flutes (1210) of the shell (120) and in that that a second cold radial clearance is provided between the tips of the teeth (1220) of the shell (120) and the bottom of the flutes (1310) of each mandrel (130). Installation selon l'une quelconque des revendications 6 à 8, caractérisée en ce que chaque rouleau comprend en outre un élément annulaire de renfort (156) placé autour de chaque couronne ou chaque pluralité de segments de couronne (151, 152).An installation according to any of claims 6 to 8, characterized in that each roller further comprises an annular reinforcing member (156) disposed around each ring or each plurality of ring segments (151, 152). Installation selon la revendication 9, caractérisée en ce que l'élément annulaire de renfort (156) comprend un collier élastique en matériau métallique précontraint.Installation according to claim 9, characterized in that the annular reinforcing element (156) comprises an elastic collar of prestressed metal material. Installation selon la revendication 9, caractérisée en ce que l'élément annulaire de renfort comprend un collier réalisé en un matériau présentant un coefficient de dilatation égale ou légèrement supérieur au coefficient de dilatation thermique de la couronne ou des segments de couronne.Installation according to claim 9, characterized in that the annular reinforcing element comprises a collar made of a material having a coefficient of expansion equal to or slightly greater than the coefficient of thermal expansion of the ring or ring segments. Installation selon l'une quelconque des revendications 1 à 5, caractérisée en ce que chaque rouleau (300) comprend un mandrin (310) en matériau métallique prolongé à chaque extrémité par une fusée (311 ; 312), ledit mandrin comportant une pluralité de cannelures (313) et en ce que la virole (320) est disposée autour du mandrin (311) et comprend une pluralité de dents (3110, 3120) en prise respectivement avec les cannelures (313) du mandrin.Installation according to any one of claims 1 to 5, characterized in that each roller (300) comprises a mandrel (310) of metal material extended at each end by a rocket (311; 312), said mandrel comprising a plurality of grooves (313) and that the ferrule (320) is disposed around the mandrel (311) and comprises a plurality of teeth (3110, 3120) respectively engaged with the splines (313) of the mandrel. Installation selon la revendication 12, caractérisée en ce qu'un premier jeu radial à froid est ménagé entre le sommet des dents (3110, 3120) de la virole (320) et le fond des cannelures (313) du mandrin (310).Installation according to claim 12, characterized in that a first radial clearance is formed between the top of the teeth (3110, 3120) of the ferrule (320) and the bottom of the grooves (313) of the mandrel (310). Installation selon l'une quelconque des revendications 1 à 5, caractérisée en ce que ledit rouleau (200) comprend deux fusées (213, 214) fixées de chaque côté de la virole (220), chaque fusée (213 ; 214) étant prolongée par un arbre en matériau métallique (211 ; 212), les arbres et les fusées ayant une surface de contact de forme tronconique.Installation according to any one of claims 1 to 5, characterized in that said roller (200) comprises two fuses (213, 214) fixed on each side of the shell (220), each rocket (213; 214) being extended by a shaft of metallic material (211; 212), the shafts and rockets having a frustoconical shaped contact surface. Installation selon l'une quelconque des revendications 1 à 14, caractérisée en ce que le bain (11) de métal fondu (12) contient du zinc liquide pour la réalisation d'un traitement de galvanisation.Installation according to any one of claims 1 to 14, characterized in that the bath (11) of molten metal (12) contains liquid zinc for carrying out a galvanizing treatment.
EP12162168.4A 2011-05-13 2012-03-29 Treatment facility with molten metal bath Active EP2522759B1 (en)

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FR1154164A FR2975106B1 (en) 2011-05-13 2011-05-13 TREATMENT PLANT WITH MOLTEN METAL BATH AND ROLLERS

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EP2522759A1 true EP2522759A1 (en) 2012-11-14
EP2522759B1 EP2522759B1 (en) 2020-04-22

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EP12162168.4A Active EP2522759B1 (en) 2011-05-13 2012-03-29 Treatment facility with molten metal bath

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EP (1) EP2522759B1 (en)
FR (1) FR2975106B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113383104A (en) * 2019-01-31 2021-09-10 克利夫兰-克利夫斯钢铁产权公司 Method and device for extending the service life of a stabilizer of a coating line
CN114555852A (en) * 2019-12-09 2022-05-27 安赛乐米塔尔公司 Roller connecting piece

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0339338A1 (en) 1988-04-22 1989-11-02 INTERATOM Gesellschaft mit beschränkter Haftung Use of carbon fibre-reinforced carbon in conveying devices in melts
EP0418839A1 (en) * 1989-09-20 1991-03-27 Hitachi, Ltd. Apparatus which comes in contact with molten metal and composite member and sliding structure for use in the same
JPH04193936A (en) * 1990-11-28 1992-07-14 Kawatetsu Galvanizing Co Ltd Roll device in molten metal bath
WO2010111341A1 (en) * 2009-03-24 2010-09-30 Pyrotek, Inc. Quick change conveyor roll sleeve assembly and method
FR2950631A1 (en) 2009-09-29 2011-04-01 Snecma Propulsion Solide HIGH TEMPERATURE ROUND LINE ROLL.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0339338A1 (en) 1988-04-22 1989-11-02 INTERATOM Gesellschaft mit beschränkter Haftung Use of carbon fibre-reinforced carbon in conveying devices in melts
EP0418839A1 (en) * 1989-09-20 1991-03-27 Hitachi, Ltd. Apparatus which comes in contact with molten metal and composite member and sliding structure for use in the same
JPH04193936A (en) * 1990-11-28 1992-07-14 Kawatetsu Galvanizing Co Ltd Roll device in molten metal bath
WO2010111341A1 (en) * 2009-03-24 2010-09-30 Pyrotek, Inc. Quick change conveyor roll sleeve assembly and method
FR2950631A1 (en) 2009-09-29 2011-04-01 Snecma Propulsion Solide HIGH TEMPERATURE ROUND LINE ROLL.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113383104A (en) * 2019-01-31 2021-09-10 克利夫兰-克利夫斯钢铁产权公司 Method and device for extending the service life of a stabilizer of a coating line
CN114555852A (en) * 2019-12-09 2022-05-27 安赛乐米塔尔公司 Roller connecting piece
CN114555852B (en) * 2019-12-09 2024-02-02 安赛乐米塔尔公司 Roller connector

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FR2975106B1 (en) 2013-06-14
EP2522759B1 (en) 2020-04-22
FR2975106A1 (en) 2012-11-16

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