WO1994022619A1 - Method and device for forming a metal sheath on an elongate core - Google Patents

Method and device for forming a metal sheath on an elongate core Download PDF

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Publication number
WO1994022619A1
WO1994022619A1 PCT/FR1994/000372 FR9400372W WO9422619A1 WO 1994022619 A1 WO1994022619 A1 WO 1994022619A1 FR 9400372 W FR9400372 W FR 9400372W WO 9422619 A1 WO9422619 A1 WO 9422619A1
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WO
WIPO (PCT)
Prior art keywords
core
filler metal
mold
ingot mold
envelope
Prior art date
Application number
PCT/FR1994/000372
Other languages
French (fr)
Inventor
Jean-Claude Werquin
Original Assignee
Forcast International
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Forcast International filed Critical Forcast International
Priority to DE69404832T priority Critical patent/DE69404832T2/en
Priority to EP94912583A priority patent/EP0693011B1/en
Publication of WO1994022619A1 publication Critical patent/WO1994022619A1/en

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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
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • 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
    • B22D11/008—Continuous casting of metals, i.e. casting in indefinite lengths of clad ingots, i.e. the molten metal being cast against a continuous strip forming part of the cast product

Definitions

  • the present invention relates to a process f and a device for producing a metalli ⁇ envelope on a core of elongated shape and of metallurgical composition * different from that of said envelope,
  • the present invention also relates to a rolling mill cylinder obtained by this process.
  • the methods of producing a metal casing on an elongated core 10 consist of moving the core vertically and coaxially in an ingot mold, the internal wall of which provides space with the external wall of the core and whose internal section corresponds substantially to the section of said envelope, to pour, into said space, a molten filler metal 15, intended to form said envelope, to heat the upper part of the mold and to cool the part bottom of said mold to solidify said filler metal.
  • A-6160256 a process for producing a metal casing on a core, in which the molten filler metal intended to form said casing is kept at temperature, before it solidifies, in an ingot mold
  • the supply of molten filler metal is maintained at temperature by a coil with high frequency induction.
  • a preheating of the filler metal supplying the conical upper part of the mold is carried out, as well as an enameling of the core in order to facilitate the connection between the filler metal intended to form the envelope and the metal constituting the core.
  • the object of the invention is to avoid the drawbacks mentioned above by proposing a method and a device for producing a metal casing on an elongated core, particularly simple to implement and making it possible to provide a hot pickling of the external wall of the core just before the deposition of the filler metal.
  • the subject of the invention is therefore a method of producing a metal casing on a core of elongated shape and of metallurgical composition different from that of said casing, to form a bimetallic composite product, such as for example a rolling mill cylinder, process in which :
  • the core is moved vertically and coaxially in an ingot mold, the internal wall of which provides space with the external wall of the core and the internal section of which corresponds substantially to the section of said envelope,
  • the core is moved in the mold by communicating to it a continuous vertical oscillation associated with the vertical downward movement of said core,
  • the molten filler metal is covered, inside the ingot mold and at the upper part of said ingot mold, with an electrically conductive slag, - the electroconductive slag is heated to a temperature above 1450 ° C. ,
  • the molten filler metal is poured into the space formed between the internal wall of the ingot mold and the external wall of the core, by pouring said previously molten metal into an oven associated with said ingot mold,
  • a subject of the invention is also a device for producing a metal casing on an elongated core, for implementing the method mentioned above, said device comprising an ingot mold of internal section corresponding substantially to the section of said envelope and the internal wall of which forms a space with the external wall of said core for a molten filler metal intended to form said envelope, said ingot mold comprising at its lower part cooling means for solidifying the metal of contribution, characterized in that the mold is formed by an upper ring for heating and rotating an electroconductive slag placed above the filler metal in said mold, a lower ring provided with said cooling means and a electrically insulating ring and separating said rings.
  • the upper ring is split vertically to form an induction coil with a turn and a first heating electrode by Joule effect of the electroconductive slag, a second heating electrode by Joule effect of said slag being formed by the core, device comprises a furnace for maintaining the temperature of the molten filler metal associated with the ingot mold,
  • the subject of the invention is also a rolling mill cylinder of the type comprising a core of elongated shape and a metal casing of metallurgical composition different from that of said core, characterized in that it is obtained by the process mentioned above.
  • the invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the single appended figure which represents a perspective view partially broken away of the device according to the invention.
  • the device shown in the figure is intended for producing a metal casing 2 of hard alloy on an elongated core, such as for example a shaft 1 of structural steel of the XC38 or 35CD4 type to form a bimetallic composite product and in particular a rolling mill cylinder.
  • the device comprises an ingot mold 10 intended to receive a molten filler metal 5 constituting the metallic envelope 2 and which is crossed by the shaft 1.
  • the shaft 1 is moved vertically and coaxially in the ingot mold 10 and for this, this shaft 1 is, on the one hand, suspended at its upper end la for example by a flange 3 to a suitable support member, not shown, and, on the other hand guided at its lower end lb .
  • the shaft 1 is also driven in a vertical oscillating movement at the same time as the vertical downward movement in the mold 10.
  • This ingot mold 10 has an internal section corresponding substantially to the section of the envelope 2.
  • the internal wall 10a of the mold 10 provides a space 4 with the external wall 1c of the shaft
  • the ingot mold 10 is formed of an upper ring 11, a lower ring 12 and an electrically insulating ring 13 separating said rings 11 and 12.
  • the rings 11 and 12 are hollow and are for example made of copper.
  • the upper ring 11 is connected to a power source, not shown, in direct current on which is superimposed a low frequency current.
  • the upper ring 11 has a vertical slot 11a so as to form an induction coil with a turn and a first Joule heating electrode.
  • a second heating electrode is formed by the shaft 1.
  • the rings 11 and 12 comprise cooling means, not shown, which are formed for example by at least one water circulation circuit formed in said rings.
  • the upper ring 11 also comprises a funnel 14 intended to ensure the flow of the filler metal 5 in the space 4 and which is contained in an oven 6 for maintaining the temperature of said filler metal.
  • This oven 6 is for example constituted by an induction oven.
  • the molten filler metal 5 contained in the furnace 6 is poured by successive sips into the space 4 by the intermediary ⁇ diary of the funnel 14.
  • the filler metal 5 in the space 4 is covered with an electroconductive slag 7 at the level of the upper ring 11 of the ingot mold 10.
  • This electroconductive slag 7 is heated by Joule effect at a temperature above 1450 ⁇ C and for example at 1500 ° C. by the heating electrodes formed respectively by the upper ring 11 and the shaft 1.
  • the split upper ring 11 which forms an induction coil, rotates the electroconductive slag 7 in the mold 10 and around the shaft 1 using the low frequency current.
  • the speed of rotation of the electroconductive slag 7 is equal to approximately 1 revolution per second, which makes it possible to carry out a stripping of the external wall 1c of the shaft 1 just before this wall comes into contact with the filler metal. 5 in fusion intended to form the envelope 2.
  • the rotational movement of the electro slag conductor 7 makes it possible to put the shaft 1 in an ideal condition for achieving perfect welding between the metal of the shaft 1 and the metal of the casing 2.
  • the molten filler metal 5 poured by successive sips into the space 4 passes through the electroconductive slag 7 and gradually solidifies by coming into contact with the lower ring 12 which is cooled.
  • the molten filler metal 5 is distributed homogeneously around the shaft 1 thanks in particular to the rotation of the electroconductive slag 7.
  • the casing 2 is formed progressively on said shaft 1.
  • the solidified part of the casing 2 forms a movable bottom of the mold 10.
  • a ring can be mounted on the shaft 1 to form the movable bottom of the ingot mold 10 at the start of the casting of the filler metal 5 in fusion in said ingot mold.
  • the vertical downward movement of the shaft 1 according to a continuous oscillation allows the gradual demolding of the composite product thus produced, from the ingot mold 10.
  • the device according to the invention makes it possible to pour and solidify approximately 10 kg / min. of working metal.
  • the device according to the invention can allow the filler metal to flow more quickly, but, in this case, the height of the filler metal in the ingot mold 10 must be small in order to prevent the two solidification fronts formed by the lower ring 12 and by the shaft 1 produce porosities at the interface of these two fronts.
  • the method and the device according to the invention are perfectly suited for the production of hot and cold rolling mill rolls.
  • the molten filler metal which can be protected during casting by a jet of argon, is then purified in particular in oxidized inclusions by the action of said electroconductive slag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Furnace Details (AREA)
  • Continuous Casting (AREA)
  • Metal Extraction Processes (AREA)
  • Metal Rolling (AREA)
  • Wire Processing (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

A method for forming a metal sheath (2) on an elongate core (1) having a different metallurgical composition from that of said sheath (2). According to the method, the core (1) is moved through a casting mould (10) by imparting a continuous vertical oscillatory motion combined with a vertical downward movement of the core (1), a molten filler metal (5) is cast in the mould (5) and covered with electrically conductive slag (7), the electrically conductive slag (7) is heated to a temperature of over 1450 °C, said electrically conductive slag (7) is rotated about the core (1), and the lower portion of the mould (10) is cooled to solidify the filler metal (5). A device for carrying out the method is also disclosed.

Description

"Procédé et dispositif de réalisation d'une enveloppe métallique sur une âme de forme allongée." "Method and device for producing a metallic envelope on an elongated core."
La présente invention a pour objet un procédé f et un dispositif de réalisation d'une enveloppe métalli¬ que sur une âme de forme allongée et de composition * métallurgique différente de celle de ladite enveloppe,The present invention relates to a process f and a device for producing a metalli¬ envelope on a core of elongated shape and of metallurgical composition * different from that of said envelope,
5 pour former un produit composite bimétallique.5 to form a bimetallic composite product.
La présente invention a également pour objet un cylindre de laminoir obtenu par ce procédé.The present invention also relates to a rolling mill cylinder obtained by this process.
Jusqu'à présent, les procédés de réalisation d'une enveloppe métallique sur une âme de forme allongée 10 consistent, à déplacer l'âme verticalement et coaxiale- ment dans une lingotière dont la paroi interne ménage un espace avec la paroi externe de l'âme et dont la section interne correspond sensiblement à la section de ladite enveloppe, à couler, dans ledit espace, un métal d'apport 15 en fusion, destiné à former ladite enveloppe, à chauffer la partie supérieure de la lingotière et à refroidir la partie inférieure de ladite lingotière pour solidifier ledit métal d'apport.Hitherto, the methods of producing a metal casing on an elongated core 10 consist of moving the core vertically and coaxially in an ingot mold, the internal wall of which provides space with the external wall of the core and whose internal section corresponds substantially to the section of said envelope, to pour, into said space, a molten filler metal 15, intended to form said envelope, to heat the upper part of the mold and to cool the part bottom of said mold to solidify said filler metal.
Ces procédés permettent d'assurer la liaisonThese processes provide the link
20 de l'enveloppe métallique sur l'âme qui, dans le cas notamment des cylindres ou des rouleaux de laminoir, doit être parfaite en raison des contraintes thermiques et mécaniques élevées auxquelles ladite enveloppe est soumise.20 of the metal casing on the core which, in the case in particular of rolls or rolling mill rolls, must be perfect due to the high thermal and mechanical stresses to which said casing is subjected.
25 On connaît plus particulièrement dans le JP-25 We know more particularly in JP-
A-6160256, un procédé d'élaboration d'une enveloppe métallique sur une âme, dans lequel le métal d'apport en fusion destiné à former ladite enveloppe est maintenu en température, avant sa solidification, dans une lingotièreA-6160256, a process for producing a metal casing on a core, in which the molten filler metal intended to form said casing is kept at temperature, before it solidifies, in an ingot mold
≠ 30 en matériau réfractaire et qui est associée à un cristal- lisoir en cuivre refroidi par circulation d'eau. ≠ 30 in refractory material and which is associated with a copper crystallizer cooled by water circulation.
Le maintien en température de la réserve de métal d'apport en fusion est assuré par une bobine à induction à haute fréquence.The supply of molten filler metal is maintained at temperature by a coil with high frequency induction.
Dans ce procédé, un préchauffage du métal d'apport alimentant la partie supérieure conique de la lingotière est réalisé, ainsi qu'un émaillage de l'âme afin de faciliter la liaison entre le métal d'apport destiné à former 1'enveloppe et le métal constituant 1'âme.In this process, a preheating of the filler metal supplying the conical upper part of the mold is carried out, as well as an enameling of the core in order to facilitate the connection between the filler metal intended to form the envelope and the metal constituting the core.
Le procédé décrit dans le brevet JP-A-6160256 a pour principal inconvénient de conduire à une prépara- tion lourde et onéreuse de 1 'âme et à des investisse¬ ments élevés notamment dans des systèmes de chauffage par induction à haute fréquence du métal d'apport.The main drawback of the process described in patent JP-A-6160256 is that it leads to a heavy and costly preparation of the core and to high investments, in particular in high frequency induction heating systems of the metal 'bring.
L'invention a pour but d'éviter les inconvé¬ nients mentionnés ci-dessus en proposant un procédé et un dispositif de réalisation d'une enveloppe métallique sur une âme de forme allongée, particulièrement simple à mettre en oeuvre et permettant d'assurer un décapage à chaud de la paroi externe de 1'âme juste avant le dépôt du métal d'apport. L'invention a donc pour objet un procédé de réalisation d'une enveloppe métallique sur une âme de forme allongée et de composition métallurgique différente de celle de ladite enveloppe, pour former un produit composite bimétallique, comme par exemple un cylindre de laminoir, procédé dans lequel :The object of the invention is to avoid the drawbacks mentioned above by proposing a method and a device for producing a metal casing on an elongated core, particularly simple to implement and making it possible to provide a hot pickling of the external wall of the core just before the deposition of the filler metal. The subject of the invention is therefore a method of producing a metal casing on a core of elongated shape and of metallurgical composition different from that of said casing, to form a bimetallic composite product, such as for example a rolling mill cylinder, process in which :
- on déplace 1'âme verticalement et coaxiale- ment dans une lingotière dont la paroi interne ménage un espace avec la paroi externe de 1'âme et dont la section interne correspond sensiblement à la section de ladite enveloppe,the core is moved vertically and coaxially in an ingot mold, the internal wall of which provides space with the external wall of the core and the internal section of which corresponds substantially to the section of said envelope,
- on coule, dans ledit espace, un métal d'apport en fusion destiné à former ladite enveloppe,- a molten filler metal intended to form said envelope is poured into said space,
- on chauffe la partie supérieure de lingo¬ tière, - et on refroidit la partie inférieure de ladite lingotière pour solidifier ledit métal d'apport, caractérisé en ce que :- the upper part of the mold is heated, - and the lower part is cooled said ingot mold for solidifying said filler metal, characterized in that:
- on déplace 1'âme dans la lingotière en lui communiquant une oscillation verticale continue associée au mouvement vertical de descente de ladite âme,the core is moved in the mold by communicating to it a continuous vertical oscillation associated with the vertical downward movement of said core,
- on recouvre le métal d'apport en fusion, à 1'intérieur de la lingotière et au niveau de la partie supérieure de ladite lingotière, par un laitier électro¬ conducteur, - on chauffe le laitier électroconducteur à une température supérieure à 1450°C,- the molten filler metal is covered, inside the ingot mold and at the upper part of said ingot mold, with an electrically conductive slag, - the electroconductive slag is heated to a temperature above 1450 ° C. ,
- et on communique audit laitier électrocon¬ ducteur un mouvement de rotation autour de la 1'âme pour effectuer le décapage de la paroi externe de ladite âme avant son contact avec le métal d'apport en fusion.- And communicating to said electrocon¬ conductive slag a rotational movement around the core to effect the pickling of the external wall of said core before its contact with the molten filler metal.
Selon d'autres caractéristiques de 1'inven¬ tion :According to other features of the invention:
- on coule le métal d'apport en fusion dans l'espace ménagé entre la paroi interne de la lingotière et la paroi externe de l'âme, par déversement dudit métal préalablement fondu dans un four associé à ladite lingotière,the molten filler metal is poured into the space formed between the internal wall of the ingot mold and the external wall of the core, by pouring said previously molten metal into an oven associated with said ingot mold,
- on fond le métal d'apport dans un four à induction. L'invention a également pour objet un dispositif de réalisation d'une enveloppe métallique sur une âme de forme allongée, pour la mise en oeuvre du procédé mentionné ci-dessus, ledit dispositif comprenant une lingotière de section interne correspondant sensible- ment à la section de ladite enveloppe et dont la paroi interne ménage un espace avec la paroi externe de ladite âme pour un métal d'apport en fusion destiné à former ladite enveloppe, ladite lingotière comportant à sa partie inférieure des moyens de refroidissement pour la solidification du métal d'apport, caractérisé en ce que la lingotière est formée d'un anneau supérieur de chauffage et de mise en rotation d'un laitier électrocon¬ ducteur disposé au-dessus du métal d'apport dans ladite lingotière, d'un anneau inférieur muni desdits moyens de refroidissement et d'une couronne isolante électrique¬ ment et séparant lesdits anneaux.- the filler metal is melted in an induction furnace. A subject of the invention is also a device for producing a metal casing on an elongated core, for implementing the method mentioned above, said device comprising an ingot mold of internal section corresponding substantially to the section of said envelope and the internal wall of which forms a space with the external wall of said core for a molten filler metal intended to form said envelope, said ingot mold comprising at its lower part cooling means for solidifying the metal of contribution, characterized in that the mold is formed by an upper ring for heating and rotating an electroconductive slag placed above the filler metal in said mold, a lower ring provided with said cooling means and a electrically insulating ring and separating said rings.
Selon d'autres caractéristiques de 1'inven¬ tion :According to other features of the invention:
- 1'anneau supérieur est fendu verticalement pour former une self d'induction à une spire et une première électrode de chauffage par effet Joule du laitier électroconducteur, une seconde électrode de chauffage par effet Joule dudit laitier étant formé par 1'âme, - le dispositif comporte un four de maintien en température du métal d'apport en fusion associé à la lingotière,The upper ring is split vertically to form an induction coil with a turn and a first heating electrode by Joule effect of the electroconductive slag, a second heating electrode by Joule effect of said slag being formed by the core, device comprises a furnace for maintaining the temperature of the molten filler metal associated with the ingot mold,
- le four de maintien en température est formé par un four à induction. L'invention a encore pour objet un cylindre de laminoir du type comportant une âme de forme allongée et une enveloppe métallique de composition métallurgique différente de celle de ladite âme, caractérisé en ce qu'il est obtenu par le procédé mentionné ci-dessus. L'invention sera mieux comprise à l'aide de la description qui va suivre donnée uniquement à titre d'exemple et faite en se référant à la figure unique annexée qui représente une vue en perspective partielle¬ ment arrachée du dispositif selon l'invention. Le dispositif représenté à la figure est destiné à la réalisation d'une enveloppe métallique 2 en alliage dur sur une âme de forme allongée, comme par exemple un arbre 1 en acier de construction du type XC38 ou 35CD4 pour former un produit composite bimétallique et notamment un cylindre de laminoir. A cet effet, le dispositif comporte une lingotière 10 destinée à recevoir un métal d'apport 5 en fusion constituant l'enveloppe métallique 2 et qui est traversée par 1'arbre 1. L'arbre 1 est déplacé verticalement et coaxialement dans la lingotière 10 et pour cela, cet arbre 1 est, d'une part, suspendu à son extrémité supé¬ rieur la par exemple par une bride 3 à un organe de support approprié, non représenté, et, d'autre part guidé à son extrémité inférieure lb.- the temperature maintenance oven is formed by an induction oven. The subject of the invention is also a rolling mill cylinder of the type comprising a core of elongated shape and a metal casing of metallurgical composition different from that of said core, characterized in that it is obtained by the process mentioned above. The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the single appended figure which represents a perspective view partially broken away of the device according to the invention. The device shown in the figure is intended for producing a metal casing 2 of hard alloy on an elongated core, such as for example a shaft 1 of structural steel of the XC38 or 35CD4 type to form a bimetallic composite product and in particular a rolling mill cylinder. To this end, the device comprises an ingot mold 10 intended to receive a molten filler metal 5 constituting the metallic envelope 2 and which is crossed by the shaft 1. The shaft 1 is moved vertically and coaxially in the ingot mold 10 and for this, this shaft 1 is, on the one hand, suspended at its upper end la for example by a flange 3 to a suitable support member, not shown, and, on the other hand guided at its lower end lb .
Par ailleurs, l'arbre 1 est également animé d'un mouvement oscillant vertical en même temps que le mouvement vertical de descente dans la lingotière 10.Furthermore, the shaft 1 is also driven in a vertical oscillating movement at the same time as the vertical downward movement in the mold 10.
Cette lingotière 10 possède une section interne correspondant sensiblement à la section de l'enveloppe 2.This ingot mold 10 has an internal section corresponding substantially to the section of the envelope 2.
La paroi interne 10a de la lingotière 10 ménage un espace 4 avec la paroi externe le de 1'arbreThe internal wall 10a of the mold 10 provides a space 4 with the external wall 1c of the shaft
1 pour le déversement du métal d'apport 5 en fusion destiné à former l'enveloppe métallique 2, comme on le verra ultérieurement.1 for the pouring of molten filler metal 5 intended to form the metal casing 2, as will be seen later.
D'autre part, la lingotière 10 est formée d'un anneau supérieur 11, d'un anneau inférieur 12 et d'une couronne 13 isolante électriquement et séparant lesdits anneaux 11 et 12.On the other hand, the ingot mold 10 is formed of an upper ring 11, a lower ring 12 and an electrically insulating ring 13 separating said rings 11 and 12.
Les anneaux 11 et 12 sont creux et sont par exemple réalisés en cuivre.The rings 11 and 12 are hollow and are for example made of copper.
L'anneau supérieur 11 est relié à une source d'alimentation, non représentée, en courant continu sur lequel est superposé un courant basse fréquence.The upper ring 11 is connected to a power source, not shown, in direct current on which is superimposed a low frequency current.
De plus, l'anneau supérieur 11 comporte une fente verticale lia de façon à former une self d'induc¬ tion à une spire et une première électrode de chauffage par effet Joule. Une seconde électrode de chauffage est formée par l'arbre 1. Les anneaux 11 et 12 comportent des moyens de refroidissement, non représentés, qui sont formés par exemple par au moins un circuit de circulation d'eau ménagé dans lesdits anneaux. L'anneau supérieur 11 comporte également un entonnoir 14 destiné à assurer l'écoulement du métal d'apport 5 dans 1'espace 4 et qui est contenu dans un four 6 de maintien en température dudit métal d'apport. Ce four 6 est par exemple constitué par un four à induction.In addition, the upper ring 11 has a vertical slot 11a so as to form an induction coil with a turn and a first Joule heating electrode. A second heating electrode is formed by the shaft 1. The rings 11 and 12 comprise cooling means, not shown, which are formed for example by at least one water circulation circuit formed in said rings. The upper ring 11 also comprises a funnel 14 intended to ensure the flow of the filler metal 5 in the space 4 and which is contained in an oven 6 for maintaining the temperature of said filler metal. This oven 6 is for example constituted by an induction oven.
Après avoir suspendu 1'arbre 1 verticalement et coaxialement dans la lingotière 10 tout en lui communiquant une oscillation verticale continue, le métal d'apport 5 en fusion contenu dans le four 6 est déversé par gorgées successives dans l'espace 4 par l'intermé¬ diaire de l'entonnoir 14.After having suspended the shaft 1 vertically and coaxially in the mold 10 while imparting to it a continuous vertical oscillation, the molten filler metal 5 contained in the furnace 6 is poured by successive sips into the space 4 by the intermediary ¬ diary of the funnel 14.
Le métal d'apport 5 dans 1'espace 4 est recouvert d'un laitier électroconducteur 7 au niveau de l'anneau supérieur 11 de la lingotière 10. Ce laitier électroconducteur 7 est chauffé par effet Joule à une température supérieure à 1450βC et par exemple à 1500°C par les électrodes de chauffage formées respectivement par l'anneau supérieur 11 et 1'arbre 1. De plus, l'anneau supérieur 11 fendu, qui forme une spire d'induction, entraîne en rotation le laitier électroconducteur 7 dans la lingotière 10 et autour de l'arbre 1 à l'aide du courant basse fréquence.The filler metal 5 in the space 4 is covered with an electroconductive slag 7 at the level of the upper ring 11 of the ingot mold 10. This electroconductive slag 7 is heated by Joule effect at a temperature above 1450 β C and for example at 1500 ° C. by the heating electrodes formed respectively by the upper ring 11 and the shaft 1. In addition, the split upper ring 11, which forms an induction coil, rotates the electroconductive slag 7 in the mold 10 and around the shaft 1 using the low frequency current.
La vitesse de rotation du laitier électrocon- ducteur 7 est égale à environ 1 tour par seconde ce qui permet d'effectuer un décapage de la paroi externe le de l'arbre 1 juste avant que cette paroi entre en contact avec le métal d'apport 5 en fusion destiné à former 1'enveloppe 2. Le mouvement de rotation du laitier électro- conducteur 7 permet de mettre 1'arbre 1 en condition idéale pour réaliser un soudage parfait entre le métal de 1'arbre 1 et le métal de 1'enveloppe 2.The speed of rotation of the electroconductive slag 7 is equal to approximately 1 revolution per second, which makes it possible to carry out a stripping of the external wall 1c of the shaft 1 just before this wall comes into contact with the filler metal. 5 in fusion intended to form the envelope 2. The rotational movement of the electro slag conductor 7 makes it possible to put the shaft 1 in an ideal condition for achieving perfect welding between the metal of the shaft 1 and the metal of the casing 2.
Le métal d'apport 5 en fusion déversé par gorgées successives dans 1'espace 4 traverse le laitier électroconducteur 7 et se solidifie progressivement en entrant en contact avec 1'anneau inférieur 12 qui est refroidi.The molten filler metal 5 poured by successive sips into the space 4 passes through the electroconductive slag 7 and gradually solidifies by coming into contact with the lower ring 12 which is cooled.
Le métal d'apport 5 en fusion est réparti de manière homogène autour de 1'arbre 1 grâce notamment à la rotation du laitier électroconducteur 7.The molten filler metal 5 is distributed homogeneously around the shaft 1 thanks in particular to the rotation of the electroconductive slag 7.
Ainsi, du fait de la descente de l'arbre 1 à travers la lingotière 10, l'enveloppe 2 se forme progres¬ sivement sur ledit arbre 1. La partie solidifiée de l'enveloppe 2 forme un fond déplaçable de la lingotière 10.Thus, due to the descent of the shaft 1 through the mold 10, the casing 2 is formed progressively on said shaft 1. The solidified part of the casing 2 forms a movable bottom of the mold 10.
Selon une variante, une bague, non représen¬ tée peut être montée sur 1'arbre 1 pour former le fond déplaçable de la lingotière 10 au début de la coulée du métal d'apport 5 en fusion dans ladite lingotière.According to a variant, a ring, not shown, can be mounted on the shaft 1 to form the movable bottom of the ingot mold 10 at the start of the casting of the filler metal 5 in fusion in said ingot mold.
D'autre part, le mouvement vertical de descente de l'arbre 1 suivant une oscillation continue permet le démoulage progressif du produit composite ainsi réalisé, de la lingotière 10. Le dispositif selon l'invention permet de couler et de solidifier environ lOkg/mn de métal d'ap¬ port.On the other hand, the vertical downward movement of the shaft 1 according to a continuous oscillation allows the gradual demolding of the composite product thus produced, from the ingot mold 10. The device according to the invention makes it possible to pour and solidify approximately 10 kg / min. of working metal.
Le dispositif selon 1'invention peut permet¬ tre de couler plus rapidement le métal d'apport, mais, dans ce cas, la hauteur de métal d'apport dans la lingotière 10 doit être faible afin d'éviter que les deux fronts de solidification formés par 1'anneau inférieur 12 et par l'arbre 1 produisent des porosités à l'inter¬ face de ces deux fronts. Le procédé et le dispositif selon l'invention sont parfaitement adaptés à la production de cylindres de laminoir à chaud et à froid.The device according to the invention can allow the filler metal to flow more quickly, but, in this case, the height of the filler metal in the ingot mold 10 must be small in order to prevent the two solidification fronts formed by the lower ring 12 and by the shaft 1 produce porosities at the interface of these two fronts. The method and the device according to the invention are perfectly suited for the production of hot and cold rolling mill rolls.
De plus, grâce à la présence du laitier électroconducteur, le métal d'apport en fusion, qui peut être protégé pendant la coulée par un jet d'argon, est ensuite épuré notamment en inclusions oxydées par l'action dudit laitier électroconducteur. In addition, thanks to the presence of the electroconductive slag, the molten filler metal, which can be protected during casting by a jet of argon, is then purified in particular in oxidized inclusions by the action of said electroconductive slag.

Claims

REVENDICATIONS 1. Procédé de réalisation d'une enveloppe métallique (2) sur une âme (1) de forme allongée et de composition métallurgique différente de celle de ladite enveloppe (2), pour former un produit composite bimétal¬ lique, comme par exemple un cylindre de laminoir, procédé dans lequel :CLAIMS 1. Method for producing a metallic envelope (2) on a core (1) of elongated shape and of metallurgical composition different from that of said envelope (2), to form a bimetallic composite product, such as for example a rolling mill cylinder, process in which:
- on déplace 1'âme (1) verticalement et coaxialement dans une lingotière (10) dont la paroi interne (10a) ménage un espace (4) avec la paroi externe (le) de 1'âme (1) et dont la section interne correspond sensiblement à la section de ladite enveloppe (2),- the core (1) is moved vertically and coaxially in a mold (10) whose internal wall (10a) provides a space (4) with the external wall (the) of the core (1) and whose internal section substantially corresponds to the section of said envelope (2),
- on coule, dans ledit espace (4), un métal d'apport (5) en fusion destiné à former ladite enveloppe (2),- a molten filler metal (5) intended to form said envelope (2) is poured into said space (4),
- on chauffe la partie supérieure de la lingotière (10),- the upper part of the mold (10) is heated,
- et on refroidit la partie inférieure de ladite lingotière (10) pour solidifier ledit métal d'apport (5), caractérisé en ce que :- And the lower part of said ingot mold (10) is cooled to solidify said filler metal (5), characterized in that:
- on déplace 1'âme (1) dans la lingotière (10) en lui communiquant une oscillation verticale continue associée au mouvement vertical de descente de ladite âme (1),the core (1) is moved in the mold (10) by communicating to it a continuous vertical oscillation associated with the vertical downward movement of said core (1),
- on recouvre le métal d'apport (5) en fusion, à l'intérieur de la lingotière (10) et au niveau de la partie supérieure (11) de ladite lingotière (10), par un laitier électroconducteur (7), - on chauffe le laitier électroconducteur (7) à une température supérieure à 1450"C,- the molten filler metal (5) is covered, inside the ingot mold (10) and at the level of the upper part (11) of said ingot mold (10), by an electroconductive slag (7), - the electroconductive slag (7) is heated to a temperature above 1450 "C,
- et on communique audit laitier électrocon¬ ducteur (7) un mouvement de rotation autour de 1'âme (1) pour effectuer le décapage de la paroi externe (le) de ladite âme avant son contact avec le métal d'apport (5) en fusion .- And said electro-conductive slag (7) communicates a rotational movement around the core (1) to effect the pickling of the external wall (the) of said core before it comes into contact with the filler metal (5) in fusion .
2. Procédé selon la revendication 1, caractérisé en ce que l'on coule le métal d'apport (5) en fusion dans 1'espace (4) ménagé entre la paroi interne (10a) de la lingotière (10) et la paroi externe (le) de la 1'âme (1), par déversement dudit métal d'apport préalablement fondu dans un four (6) associé à ladite lingotière (10).2. Method according to claim 1, characterized in that the molten filler metal (5) is poured into the space (4) formed between the internal wall (10a) of the mold (10) and the wall external (the) of the core (1), by pouring said filler metal previously melted in an oven (6) associated with said ingot mold (10).
3. Procédé selon les revendications 1 et 2, caractérisé en ce que l'on fond le métal d'apport (5) dans un four à induction.3. Method according to claims 1 and 2, characterized in that the filler metal (5) is melted in an induction furnace.
4. Dispositif de réalisation d'une enveloppe métallique (2) sur une âme (1) de forme allongée, pour la mise en oeuvre du procédé selon 1'une des revendica- tions 1 à 3, ledit dispositif comprenant une lingotière (10) de section interne correspondant sensiblement à la section de ladite enveloppe (2) et dont la paroi interne (10a) ménage un espace (4) avec la paroi externe (le) de ladite âme (10) pour un métal d'apport (5) en fusion destiné à former ladite enveloppe (2), ladite lingotière (10) comportant à sa partie inférieure des moyens de refroidissement pour la solidification dudit métal d'apport (5), caractérisé en ce que la lingotière (10) est formée d'un anneau supérieur (11) de chauffage et de mise en rotation d'un laitier électroconducteur (7) disposé au-dessus du métal d'apport (5) dans ladite lingotière (10), d'un anneau inférieur (12) muni desdits moyens de refroidissement et d'une couronne (13) isolante électriquement et séparant lesdits anneaux (11, 12). 4. Device for producing a metal casing (2) on an elongated core (1), for implementing the method according to one of claims 1 to 3, said device comprising an ingot mold (10) of internal section corresponding substantially to the section of said envelope (2) and whose internal wall (10a) provides a space (4) with the external wall (le) of said core (10) for a filler metal (5) in fusion intended to form said envelope (2), said ingot mold (10) comprising at its lower part cooling means for the solidification of said filler metal (5), characterized in that the ingot mold (10) is formed of an upper ring (11) for heating and rotating an electroconductive slag (7) disposed above the filler metal (5) in said ingot mold (10), a lower ring (12) provided with said cooling means and an electrically insulating ring (13) separating said rings (11, 12).
5. Dispositif selon la revendication 4, caractérisé en ce que l'anneau supérieur (11) est fendu verticalement pour former une self d'induction à une spire et une première électrode de chauffage par effet Joule du laitier électroconducteur (7), une seconde électrode de chauffage par effet Joule dudit laitier électroconducteur (7) étant formée par 1'âme (1).5. Device according to claim 4, characterized in that the upper ring (11) is split vertically to form an induction coil with a turn and a first heating electrode by Joule effect of the electroconductive slag (7), a second heating electrode by Joule effect of said slag electroconductive (7) being formed by the core (1).
6. Dispositif suivant la revendication (4), caractérisé en ce qu'il comporte un four (6) de maintien en température du métal d'apport (5) en fusion associé à la lingotière (10).6. Device according to claim (4), characterized in that it comprises an oven (6) for maintaining the temperature of the filler metal (5) in fusion associated with the ingot mold (10).
7. Dispositif selon la revendication 6, caractérisé en ce que le four (6) de maintien en tempéra¬ ture est formé par un four à induction.7. Device according to claim 6, characterized in that the oven (6) for maintaining in tempera¬ ture is formed by an induction oven.
8. Cylindre de laminoir du type comportant une âme (1) de forme allongée et une enveloppe métallique8. Rolling mill cylinder of the type comprising an elongated core (1) and a metal casing
(2) de composition métallurgique différente de celle de ladite âme (1), caractérisé en ce qu'il est obtenu par le procédé selon 1'une des revendications 1 à 3. (2) of metallurgical composition different from that of said core (1), characterized in that it is obtained by the process according to one of claims 1 to 3.
PCT/FR1994/000372 1993-04-02 1994-04-01 Method and device for forming a metal sheath on an elongate core WO1994022619A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE69404832T DE69404832T2 (en) 1993-04-02 1994-04-01 METHOD AND DEVICE FOR CASTING A METALLIC SHELL ON A SOUL
EP94912583A EP0693011B1 (en) 1993-04-02 1994-04-01 Method and device for forming a metal sheath on an elongate core

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR93/03927 1993-04-02
FR9303927A FR2703278B1 (en) 1993-04-02 1993-04-02 Method and device for producing a metal casing on an elongated core.

Publications (1)

Publication Number Publication Date
WO1994022619A1 true WO1994022619A1 (en) 1994-10-13

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EP (1) EP0693011B1 (en)
AT (1) ATE156398T1 (en)
DE (1) DE69404832T2 (en)
ES (1) ES2106526T3 (en)
FR (1) FR2703278B1 (en)
WO (1) WO1994022619A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998041343A1 (en) * 1997-03-18 1998-09-24 Zakrytoe Aktsionernoe Obschestvo 'elmet-Rol-Gruppa Medovara' Electroslag facing process

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2773729B1 (en) * 1998-01-21 2000-04-07 Marichal Ketin & Cie PROCESS FOR PREPARING A METAL ENVELOPE ON A SHAFT

Citations (3)

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Publication number Priority date Publication date Assignee Title
US3396778A (en) * 1964-08-24 1968-08-13 Lukens Steel Co Apparatus for cast cladding
US3455372A (en) * 1967-03-08 1969-07-15 Hidesuke Yamamoto Continuous padding method using high frequency current
US4726417A (en) * 1986-09-12 1988-02-23 Hitachi Metals, Ltd. Adamite compound roll

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FR1449220A (en) 1965-10-04 1966-08-12 Inst Elektroswarki Patona Metal ingot casting process
GB1469113A (en) 1973-10-23 1977-03-30 British Steel Corp Electroslag refining
US4305451A (en) 1977-06-23 1981-12-15 Ksendzyk Georgy V Electroslag remelting and surfacing apparatus
US4185682A (en) 1977-06-23 1980-01-29 Frumin Isidor I Electroslag remelting and surfacing apparatus

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Publication number Priority date Publication date Assignee Title
US3396778A (en) * 1964-08-24 1968-08-13 Lukens Steel Co Apparatus for cast cladding
US3455372A (en) * 1967-03-08 1969-07-15 Hidesuke Yamamoto Continuous padding method using high frequency current
US4726417A (en) * 1986-09-12 1988-02-23 Hitachi Metals, Ltd. Adamite compound roll

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998041343A1 (en) * 1997-03-18 1998-09-24 Zakrytoe Aktsionernoe Obschestvo 'elmet-Rol-Gruppa Medovara' Electroslag facing process
US6283198B1 (en) 1997-03-18 2001-09-04 Zakrytoe Aktsionernoe Obschestvo “Elmet-Rol-Guppa Medovara” Electroslag facing process

Also Published As

Publication number Publication date
FR2703278A1 (en) 1994-10-07
DE69404832D1 (en) 1997-09-11
FR2703278B1 (en) 1995-07-07
DE69404832T2 (en) 1998-01-22
EP0693011A1 (en) 1996-01-24
EP0693011B1 (en) 1997-08-06
ES2106526T3 (en) 1997-11-01
ATE156398T1 (en) 1997-08-15

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