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EP1206984B1 - Cylindre de laminoir à gradient de propriété pour le laminage de bandes ainsi que sa méthode de fabrication - Google Patents

Cylindre de laminoir à gradient de propriété pour le laminage de bandes ainsi que sa méthode de fabrication Download PDF

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Publication number
EP1206984B1
EP1206984B1 EP01125434A EP01125434A EP1206984B1 EP 1206984 B1 EP1206984 B1 EP 1206984B1 EP 01125434 A EP01125434 A EP 01125434A EP 01125434 A EP01125434 A EP 01125434A EP 1206984 B1 EP1206984 B1 EP 1206984B1
Authority
EP
European Patent Office
Prior art keywords
casting
set forth
alloy
cast
roll body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01125434A
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German (de)
English (en)
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EP1206984A3 (fr
EP1206984A2 (fr
Inventor
Manfred Dr. Heinritz
Heinz-Michael Dr. Zaoralek
Rainhard Dr. Laag
Jürgen KRÜGER
Horst Herbst
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive GmbH
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Publication of EP1206984A2 publication Critical patent/EP1206984A2/fr
Publication of EP1206984A3 publication Critical patent/EP1206984A3/fr
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Publication of EP1206984B1 publication Critical patent/EP1206984B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12458—All metal or with adjacent metals having composition, density, or hardness gradient

Definitions

  • the invention relates to a roller body for processing a web-shaped material which has been obtained as a gradient material molded body, and a method for producing the roller body.
  • a roller body of a roller has a hard, wear-resistant surface and a softer, machinable core.
  • the roller body is manufactured, for example, from forged steel, the surface of which is additionally subjected to a hardening process, for example inductive hardening.
  • liquid iron or a liquid Fe-based alloy is cast in a thick-walled form made of metal. Rapid cooling in the edge area, ie in the immediate vicinity of the metal mold, can lead to white solidification of the iron with a suitable alloy, ie the carbon of the alloy remains between the lattice sites of the iron crystal. The grating stretched in this way is very hard. In the core of the roll, the carbon precipitates as graphite when it cools more slowly. There is a gray iron structure Cooling the carbon off as graphite. There is a gray iron structure that comes close to the usual gray cast iron. This creates a bi-metal body with the desired properties in one casting.
  • Centrifugal casting differs essentially from static permanent mold casting in that the mold rotates. This offers the possibility to work with different casting alloys.
  • a shell iron optionally alloyed with chrome and nickel, is filled into the mold, where it is arranged and solidified by the centrifugal forces on the inner wall of the mold. Then the remaining mold space is filled with the so-called core iron. If the temperatures are matched appropriately, the core iron and the shell iron fuse, so that a bi-metal body is also created.
  • Two Fe-based alloys are also used for composite casting.
  • the shape is static, as with permanent mold casting. After filling the entire mold with the shell iron, wait until a solidified shell has formed. Then the still liquid core is drained through an opening in the lower mold area. After the drain opening has been closed, the mold is refilled with the core iron. There is also the variant that the still liquid shell iron is displaced by refilling with core iron.
  • the shape consists of cast iron rings, the molds, in a very high quality.
  • the molds must be processed, coated on the inside and heated before each casting.
  • the precise alignment of the molds, which are over 100 ° C, is hard work. Due to contact with the liquid iron, the inside of the mold is thermally stressed. Cracks develop and the graphite burns.
  • the molds must therefore be replaced after several castings. A complete set of dies must be kept in stock for each roll diameter to be supplied. After pouring into the mold there is no way to influence the casting quality.
  • the rotating mold In centrifugal casting, the rotating mold is usually formed by a tube made of forged, temperature-resistant steel and is also expensive. At least one shape is required for each roll diameter to be supplied. Since the rolls have different lengths, it may even be economical to use several shapes with a graduated length. Casting is then carried out in the shortest possible shape and the roll piece that is not required is separated from the solidified cast body.
  • US Pat. No. 6,089,309 describes the production of gradient materials in a continuous mold casting from two alloys cast together in a mold.
  • a temperature field is set transversely to the strand direction so that a strong atomic diffusion takes place in the liquid state and in the high temperature range of the solid state, in order to obtain a continuous change in the material composition across the strand.
  • the process is proposed, among other things, for the production of steel and semi-finished products from Fe-based alloys.
  • US Pat. No. 4,602,416 describes a crowbar which was obtained in continuous mold casting as a gradient material molded body by controlled solidification in the strand. Controlled solidification takes place by appropriately setting the conditions when the bar material is withdrawn from the mold. A steel alloy with a high carbon and carbide content is cast.
  • the invention has recognized that continuous mold casting is suitable for an inexpensive production of moldings with a property gradient.
  • the molded body gets its final shape in a continuous casting without subsequent forming processes.
  • a shaped body in the sense of the invention is in particular not understood to mean a semifinished product which first has to be plastically deformed in order to produce a shaped body.
  • material-removing processing after casting should not be ruled out.
  • the gradient material molded body of the invention can even be cast with a material addition and, after casting, immediately subjected to a material-removing processing, such as polishing, grinding, turning, milling and / or drilling, which may still be necessary, in order to form a roll body for a web processing Machine.
  • roll bodies cast into the final shape can be obtained in the same or in different lengths from a single strand.
  • the needs, in particular the customer's wishes, can be flexibly taken into account during the casting, by cutting the strand to the length required for the roll body.
  • later cutting to length should not be excluded.
  • Material-reducing surface finishing after casting is advantageously carried out only for a setting of a predetermined surface quality, which is required for the roller body.
  • the specified surface quality can in particular be the surface roughness. It is also possible to work on a predetermined wettability of the surface of the roller body in order to prepare the surface for a subsequent coating process with a coating material, for example.
  • a material-reducing post-processing if such is necessary at all, preferably serves to maintain a predetermined roughness depth. If necessary, a material-removing processing after the casting can serve, however, to avoid any form errors that may result from the casting, i.e. procedural imperfections to eliminate.
  • the molded body obtained directly by the casting can be slightly curved, have a bulge or several indentations or constrictions, which can be removed by a turning process or, if the shape errors are very small, by grinding.
  • a roll body close to the final contour is obtained directly from the casting.
  • the molded body is preferably close to the final contour such that a material-removing surface treatment can only be carried out with the proviso that a predetermined surface quality, for example the roughness depth, is set.
  • the molded body has all material properties and all geometric properties, preferably except for the tolerances that apply to the roller body.
  • continuous mold casting is thus made usable for roll bodies which have hitherto been obtained in static mold casting, while continuous casting has so far been used only for the production of semi-finished products and always with the aim of the overall homogeneous structure.
  • the invention aims to provide an alternative which is at least equivalent in terms of the gradient property, preferably even superior, for roll bodies which have hitherto only been cast statically.
  • Particularly preferred exemplary embodiments are roller bodies for Calenders for papermaking. Such roller bodies are advantageously machinable.
  • the roller bodies must have a wear-resistant surface in order to be able to fulfill their actual function as an action body.
  • the invention also relates to a hard shell casting of roller bodies in a continuous casting process.
  • a preferred application for the encapsulation of a foreign core is the production of a fiber-reinforced composite molded body.
  • a composite molded body can be formed with a wound Al-B core, which is cast in continuous mold casting, preferably with the gradient formed in the casting.
  • a cast body with a continuous mold casting is accessible to a much more intensive temperature control, in particular a stronger hypothermia.
  • a cooling medium can act directly on the cast body moving in the strand.
  • the cooling outside the mold enables intensive cooling of the rug in the outer area of the strand.
  • intensive cooling during the solidification of the cast body, preferably directly behind the mold a finely dispersed distribution of the elimination phase or of the several elimination phases is achieved.
  • the thermal energy of the cast body is used in conjunction with the external forced cooling in order to adjust the structure in the cast body, which changes continuously from the outside to the inside. Structure variations due to However, one tries to prevent excretions in traditional continuous casting or, if this does not succeed, to compensate them again by subsequent heat treatment.
  • a subsequent heat treatment of the cast body obtained according to the invention does not have to be carried out, but can be provided in addition.
  • the matrix of the cast body can be conditioned by subsequent heating and the diffusion processes made possible in order to produce a structural state in the cast body shell that is closer to the thermodynamic equilibrium than immediately after the casting.
  • the carbides are distributed even more finely in the shell in order to be preserved in this state by repeated cooling of the rug.
  • the energy required for subsequent heating can, however, be kept low on account of the advantageous structural design already provided by the invention.
  • a core of the shaped body has solidified in thermodynamic equilibrium.
  • the gradient is preferably established in a transition area between the core and the shell.
  • a roller body for the processing of sheet-like materials can be obtained in the same or a similar structure as in the static casting processes known for such bodies.
  • significantly higher heat dissipation rates on the surface of the cast body than with static casting and thus a particularly fine granularity in the shell can be set.
  • the at least one base melt can be an Al, Ti, Ni or Cu base alloy. It is preferably an Fe-based alloy. Although in principle only one alloy element can be alloyed to the base element, the base melt is preferably formed with at least two alloy elements, with each alloyed element in the base melt having a proportion that extends to at most the nearest ternary eutectic. This also applies to the alloying of more than two alloy elements, where C is counted as an alloy element.
  • the at least one base melt is preferably a cast alloy, that is to say an alloy of metals, in which the final workpiece shape is obtained, apart from the relatively minor post-processing that may have to be carried out, by filling the alloy in a suitable casting mold in the liquid state, as is the case with static casting Case is.
  • the casting alloy has good casting properties. This requirement is best met by thermodynamically subcoolable and thus metastable quenchable alloys, which are therefore preferred cast alloys for gradient materials according to the invention. Eutectically composed alloys are also preferred gradient materials, in particular for moldings in which particularly fine-grained structures are required right down to the core of the cast component.
  • a preferred alloying element for each of the base metals is Zr as a strong glass former.
  • Si is an alloying element, preferably in combination with Zr.
  • Cu-based alloys particularly preferably contain one or more of the elements Zr, B and Ti as alloying elements.
  • Fe-based alloys are alloyed in such a way that the shell is formed unalloyed or alloyed in chilled cast iron, with the elements Cr and / or Mo preferred alloy elements for chilled cast iron are alloyed.
  • a particularly preferred Fe base melt is preferably undersilicated compared to a typical cast iron and has a silicon content of at least 0.1 and at most 1.2% by weight, preferably at most 0.8%. Otherwise, the alloy corresponds to cast iron alloys.
  • the silicon content of the Fe base melt is preferably higher, the higher the cooling rate or cooling rate of the cast body. It also follows from this that the silicon content is advantageously selected as a function of the cross section of the cast body obtained directly from the continuous casting. In the case of a cast body with, for example, a circular-cylindrical cross section, the silicon content of the base melt is reduced with increasing diameter within the range mentioned. This applies analogously to non-circular cylindrical cross sections.
  • An Fe base melt is preferably supersaturated with carbon, the carbon content ranging from 0.2 to at most 5% by weight, preferably at most 4%.
  • the melt can advantageously also be oversaturated on another alloy element in addition to the carbon supersaturation.
  • the carbon supersaturation and undersilicate can each be used individually, but in combination they are particularly advantageous for the excretion of carbides in the shell with simultaneous stable solidification in a core area of the cast body.
  • a likewise preferred Fe base melt is formed by a tool steel alloy with a C content of at least 0.8 and at most 1.5% by weight, a Cr content of at least 5 and at most 12% by weight and at least one of the primary carbide formers V, Mo and W. If only one of the primary carbide formers is added, the V content in the case of V is at least 5 and at most 10% by weight, in the case of Mo the Mo content is at least 0.5 and at most 1.5% by weight, and the W content in the case of W is at most 1% by weight.
  • the lower limits per alloying element can also be fallen below.
  • the levels of C and the primary carbide formers are selected within the specified limits so that the carbon is used up by the one or more primary carbide formers by carbide formation.
  • the alloying element Cr absorbs the tolerance on C, ie the inaccuracy of the addition of C that cannot ultimately be completely avoided by chromium carbide formation.
  • Zr and / or Y can also be alloy components.
  • Si preferably does not have the tool steel alloy.
  • the shaped body has the above-mentioned C content and possibly also the contents of the other alloy elements in cross section because of the gradient on average.
  • Preferred gradient material moldings which are obtained from the tool steel alloy in continuous mold casting are roller bodies for rolling foils or roller bodies for foil calenders, in particular for high-strength, filled plastic foils.
  • roller bodies with an elastic modulus (Young's modulus) defined over the length of the roller body, hereinafter abbreviated as a modulus of elasticity.
  • a modulus of elasticity for a roll body made of tool steel for a film calendar, a modulus of elasticity of, for example, 210 GPa that is constant over the entire length of the roll body can be set.
  • the setting of a defined modulus of elasticity can also be used for roller bodies made of cast iron and in principle for all gradient material molded bodies according to the invention.
  • the continuous mold casting also enables the controlled variation of the modulus of elasticity over the length of the molded body.
  • the radial stiffness of a roll body for a calender can be adjusted in the axial direction by such a targeted adjustment of the modulus of elasticity in the continuous casting in such a way that a gap that is formed between two rolling roll bodies for web treatment is in the axial direction Direction has a constant gap width.
  • the variation in the gap width to be expected in the load case without such compensation is thus already taken into account in the casting by appropriate variation of the modulus of elasticity in the axial direction.
  • process parameters of continuous mold casting such as, in particular, strand pulling speed and cooling of the strand surface, are selected in accordance with the modulus of elasticity setting.
  • a controlled casting process is preferably used to adjust the modulus of elasticity.
  • the modulus of elasticity is determined indirectly during casting, for example by means of ultrasound measurement and / or magnetostriction measurement on the strand during solidification. In the case of an ultrasound measurement, the modulus of elasticity is determined by determining the speed of sound. In this case, the speed of sound is the controlled variable of the control for the casting process.
  • the core area of the cast body can be fully cylindrical or hollow cylindrical.
  • the continuous casting of a hollow cylindrical casting has the advantage that there is no problem with internal voids.
  • a cylindrical cast body is obtained by casting a base alloy, for example an Fe base alloy with a specific carbon content and a specific silicon content and optionally further alloy elements, in a continuous casting installation to form a continuous, preferably straight, vertical strand.
  • a base alloy for example an Fe base alloy with a specific carbon content and a specific silicon content and optionally further alloy elements
  • An average pulling speed of the strand from a continuous casting mold preferably satisfies the relation 10 v v m 7 7 x 10 7 x D -z .
  • the average pulling speed v m results from this in mm / min.
  • D is the outside diameter of the body in mm
  • z is a dimensionless factor with a value in the range between 1.9 and 2.0.
  • the average pulling speed 10 mm / min v v m 140 140 mm / min.
  • the metallurgical length is preferably less than or at most equal to 2/3 of the strand length.
  • the strand can be withdrawn from the continuous casting mold at a uniform speed.
  • a current pull-off speed is constant and equal to the average pull-off speed.
  • the current pull-off speed can fluctuate, the fluctuations or changes in the current pull-off speed being periodic. Within the periodicity, the current pull-off speed can even be zero, with the resulting standstill phases each not longer than 5 seconds.
  • the invention makes it possible to dispense with an extensive and expensive mold park. It is also only necessary to provide as much liquid alloy as is necessary for the length of the molded body to be produced.
  • the subcooling of the strand during the pulling can be adapted particularly well to the desired gradient.
  • the effects and the intensity are considerably expanded compared to the static casting.
  • the pull-off speed and cooling the strand By controlling the pull-off speed and cooling the strand, the solidification process in the strand is specifically influenced in relation to the desired gradient.
  • the thickness and the uniformity of the shell formation can thus be controlled.
  • the fine grain of the structure is improved and with it the strength and hardness of the surface.
  • the supercooling, nucleation and crystallization of the melt can be influenced in such a way that alloys are formed far outside of the thermodynamic equilibrium.
  • Mechanical and physical properties such as hardness, tensile strength, thermal conductivity, mechanical damping behavior and / or heat storage capacity, can thus be achieved, which cannot be achieved with gravity die casting and centrifugal casting or can only be achieved with significantly higher technical outlay. This is for the Use properties as well as wear and corrosion resistance are an advantage.
  • the invention allows the targeted production of a multi-phase gradient material with a continuous, but nevertheless defined transition between a hard shell and a core, which is softer in comparison, from a single base alloy.
  • the invention allows a bi-metallic body to be produced in a targeted manner by means of a base melt that solidifies in a metastably solidifying manner.
  • Figure 1 shows a schematic representation of a continuous casting plant for producing a cylindrical molded body made of hard chilled casting.
  • a liquid iron alloy with a carbon content in the range between 2 and 5% by weight and a silicon content in the range between 0.2 and 1.2% by weight, preferably 0.2 and 0.6%, based on the total alloy mass, is accommodated in a warming device 1 of the continuous casting installation.
  • a continuous casting mold 2 is arranged under the holding device 1. Below the mold 2 there is a lowering device 10 with a lowerable platform 3. Between the mold 2 and the platform 3 there is a cooling device 5 around the strand 4 or, if appropriate, a plurality of cooling devices are arranged.
  • the cooling device or cooling devices 5 has blowing nozzles for a cooling gas and / or spray nozzles for a cooling liquid.
  • the liquid iron alloy is fed from the holding device 1 to the mold 2.
  • the melt solidifies on the surface in a thin supporting skin in the cooled mold 2.
  • the cooling device 5 After the mold 2, the strand stabilized in this way runs through 4, the cooling device 5 and is cooled in a controlled manner after it has been lowered from the effective area of the mold 2.
  • the forced cooling begins close to the mold, preferably immediately behind the mold outlet.
  • a rugged cooling is carried out, in which carbides are precipitated in an finely dispersed distribution within an outer shell of the strand and later shaped body and the fine-grained structure is frightened.
  • the solidification takes place radially under the hard shell thus formed, i.e. the thermodynamically stable graphite phase is formed.
  • a blank with a gray cast iron core and a white solidified shell is produced, which after the casting is processed in the same way as the blanks obtained by the static casting processes, in order, for example, to obtain a roller body for the treatment of a web-shaped material or a grinding body.
  • the strand 4 rests on the platform 3.
  • the pulling speed v of the strand 4 i.e. the speed at which the strand 4 is withdrawn from the mold 2 and passed through the cooling device 5 is equal to the lowering speed of the platform 3.
  • the lowering device 10 supports and guides the platform 3.
  • the platform 3 is preferably designed like a hydraulic lifting platform.
  • the strand 4 can have a diameter of up to 2000 mm when casting an Fe-based alloy in the case of a circular cylindrical strand.
  • the strand diameter can be even larger due to the better thermal conductivity of Cu.
  • the silicon content of an Fe base melt is increased with the strand diameter.
  • the silicon content can be up to 0.7%, while the silicon content of the base melt is lower in the case of thicker strands should be and with a strand diameter of about 2000 mm is preferably reduced to 0.1%. Gradient formation is supported by the sub-silicification.
  • the outer shell solidified outside of the thermodynamic equilibrium is preferably thicker the larger the diameter of the cast body, not least in order to obtain the larger material addition desired for larger diameters in the event of machining the surface.
  • the thickness of the quench layer in the case of roller bodies is preferably approximately 100 mm.
  • the thickness of the quench layer is advantageously between 1% and 10% of the diameter of the cast body, the thickness being set as uniformly as possible over the circumference of the cast body.
  • the thickness of the quench layer can also be varied in a targeted manner over the circumference.
  • a core or an inner mold can be used for the continuous casting of a hollow cylinder.
  • the core itself is preferably attached to a lifting or lowering device above the mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (18)

  1. Corps de cylindre pour l'usinage d'un matériau en forme de bande, qui est formé sous la forme d'un corps profilé en matériau à gradient avec un noyau et une coquille extérieure, dans lequel le corps profilé en matériau à gradient a été obtenu à partir d'un alliage métallique qui s'est solidifié dans la coquille du corps profilé à l'extérieur de l'équilibre thermodynamique, en une coulée continue en coquille, non pas en tant que semi-produit, mais proche du contour définitif du corps de cylindre,
    dans lequel l'alliage métallique se solidifie de façon stable dans le noyau et est durci dans son réseau cristallin par refroidissement brusque dans la coquille.
  2. Corps de cylindre selon la revendication 1, caractérisé en ce que l'alliage métallique est un alliage de fonderie.
  3. Corps de cylindre selon l'une des revendications précédentes, caractérisé en ce que l'alliage métallique est un alliage à base de fer.
  4. Corps de cylindre selon l'une des revendications précédentes, caractérisé en ce que l'alliage métallique est un alliage de fonte de fer.
  5. Corps de cylindre selon l'une des revendications précédentes, caractérisé en ce que la coquille extérieure présente une épaisseur qui est comprise entre 1% et 20% de la distance moyenne entre la surface de la coquille et l'axe médian longitudinal du corps de cylindre.
  6. Corps de cylindre selon l'une des revendications précédentes, caractérisé en ce qu'un alliage à base de fer solidifié blanc forme la coquille.
  7. Corps de cylindre selon l'une des revendications précédentes, caractérisé en ce que le corps de cylindre est un corps profilé composite avec des fibres enrobées par l'alliage métallique, s'étendant dans la direction longitudinale du corps de cylindre.
  8. Procédé de fabrication d'un corps de cylindre pour l'usinage d'un matériau en forme de bande, qui est formé en tant que corps profilé en matériau à gradient avec un noyau et une coquille extérieure, dans lequel
    a) le corps de cylindre est coulé dans sa forme définitive à partir d'au moins un métal fondu allié de manière sursaturée dans une coulée continue en coquille,
    b) le métal fondu est refroidi de l'extérieur lors de la coulée, de sorte qu'il se solidifie à l'extérieur de l'équilibre thermodynamique dans une coquille extérieure qui forme la coquille extérieure du corps profilé,
    c) le bain de métal est solidifié dans son réseau cristallin, dans sa coquille extérieure, par refroidissement brusque intense,
    d) et dans un noyau entouré par la coquille extérieure, qui forme le noyau du corps profilé, il se solidifie de manière stable.
  9. Procédé selon les revendications précédentes, caractérisé en ce que le corps profilé est coulé en une barre verticale.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que le métal fondu est formé avec un métal de base et au moins deux éléments d'alliage, les éléments d'alliage étant alliés ensemble chacun dans une proportion qui va au plus jusqu'au système eutectique ternaire le plus proche.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que le métal de base est Al, Ti, Fe, Ni ou Cu et les éléments d'alliage font partie du groupe comprenant B, C, Si, P, S, Ti, V, Cr, Mn, Ni, Cu, Co, Zr, Mo et W.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que le métal fondu est un bain à base de fer sous-silicé avec une teneur en silicium d'au moins 0,1% et au plus de 1,2%.
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce que le métal fondu est sursaturé en carbone avec une teneur en carbone d'au moins 0,2% à 5% au plus.
  14. Procédé selon l'une des revendications précédentes, caractérisé en ce que le procédé est en outre mis en oeuvre de manière que dans des sections transversales du corps profilé, de préférence dans toutes les sections transversales du corps profilé, il s'établisse un module d'élasticité prédéfini, dont la moyenne est calculée sur la section transversale considérée.
  15. Procédé selon la revendication précédente, caractérisé en ce que pendant la coulée on mesure une grandeur caractéristique physique du corps coulé et on la reconduit en tant que grandeur de régulation à une régulation du procédé, la grandeur caractéristique physique étant choisie de manière qu'à partir de celle-ci on puisse parvenir au module d'élasticité qui s'établit.
  16. Procédé selon l'une des revendications précédentes, caractérisé en ce que le métal fondu est coulé dans une installation de coulée continue (1, 2 ; 5, 10) en une barre (4) continue, et une vitesse moyenne d'enlèvement (Vm) de la barre (4) satisfait à la relation (Vm < 7 x 107 x D2), Vm étant la vitesse moyenne d'enlèvement en millimètres/minute, D le diamètre extérieur du corps profilé en millimètres et z un facteur sans dimension d'une valeur comprise entre 1,9 et 2,0.
  17. Procédé selon la revendication précédente, caractérisé en ce qu'une vitesse d'enlèvement instantanée v est modifiée périodiquement.
  18. Procédé selon la revendication précédente, caractérisé en ce que des phases d'arrêt se produisant de la barre (4) présentent une durée de 5 secondes au maximum.
EP01125434A 2000-11-09 2001-11-02 Cylindre de laminoir à gradient de propriété pour le laminage de bandes ainsi que sa méthode de fabrication Expired - Lifetime EP1206984B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10055449A DE10055449A1 (de) 2000-11-09 2000-11-09 Gradientenwerkstoff-Formkörper
DE10055449 2000-11-09

Publications (3)

Publication Number Publication Date
EP1206984A2 EP1206984A2 (fr) 2002-05-22
EP1206984A3 EP1206984A3 (fr) 2003-02-05
EP1206984B1 true EP1206984B1 (fr) 2004-12-29

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CN103817297B (zh) * 2014-01-18 2015-07-22 辽宁工业大学 一种强制冷却铜管内铝液制备铜包铝复合铸锭的方法及其装置

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EP1206984A3 (fr) 2003-02-05
DE50104958D1 (de) 2005-02-03
DE10055449A1 (de) 2002-05-23
EP1206984A2 (fr) 2002-05-22
US20020096309A1 (en) 2002-07-25
JP2002161345A (ja) 2002-06-04
US20040197592A1 (en) 2004-10-07

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