EP0693011B1 - 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

Info

Publication number
EP0693011B1
EP0693011B1 EP94912583A EP94912583A EP0693011B1 EP 0693011 B1 EP0693011 B1 EP 0693011B1 EP 94912583 A EP94912583 A EP 94912583A EP 94912583 A EP94912583 A EP 94912583A EP 0693011 B1 EP0693011 B1 EP 0693011B1
Authority
EP
European Patent Office
Prior art keywords
core
mould
addition metal
metal
electrically conductive
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
EP94912583A
Other languages
German (de)
French (fr)
Other versions
EP0693011A1 (en
Inventor
Jean-Claude Werquin
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.)
Forcast International
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9445702&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0693011(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Forcast International filed Critical Forcast International
Publication of EP0693011A1 publication Critical patent/EP0693011A1/en
Application granted granted Critical
Publication of EP0693011B1 publication Critical patent/EP0693011B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 subject of the present invention is a method and a device for 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.
  • the methods of producing a metal casing on an elongated core consist of moving the core vertically and coxially in an ingot mold whose internal wall provides space with the external wall of the core and whose the internal section corresponds substantially to the section of said envelope, to flow, into said space, a molten filler metal, intended to form said envelope, to heat the upper part of the mold and to cool the lower part of said mold to solidify said filler metal (see for example US-A-3455372).
  • JP-A-6160256 a process for preparing a metal casing on a core, in which the molten filler metal intended to form said casing is maintained at temperature, before it solidifies, in an ingot mold made of refractory material and which is associated with a copper crystallizer cooled by circulation of water.
  • the supply of molten filler metal is maintained at temperature by a coil with high frequency induction.
  • 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 pickling at hot of the outer wall of the core just before the deposition of the filler metal.
  • the invention also relates to a device for producing a metal casing on an elongated core, for the implementation of 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 mold comprising at its lower part cooling means for solidifying the filler metal, characterized in that it comprises means communicating a continuous vertical oscillation to the core associated with its vertical downward movement during the casting of the filler metal and the ingot mold is formed by an upper ring for heating and for rotating an electrically conductive slag disposed above the filler metal in said ingot mold, a lower ring provided with said cooling means and an electrically insulating ring separating said rings.
  • 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 metal 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 1a for example by a flange 3 from a suitable support member, not shown, and , on the other hand guided at its lower end 1b.
  • 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 1 for the pouring of the molten filler metal 5 intended to form the metal casing 2, as will be seen later.
  • 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 heating electrode by Joule effect.
  • a second heating electrode is formed by the shaft 1.
  • the rings 11 and 12 include 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 includes 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 via 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 mold 10.
  • This electroconductive slag 7 is heated by the Joule effect to a temperature higher than 1450 ° C. and for example to 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 strip 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 electrically conductive slag 7 makes it possible to put the shaft 1 in 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 in 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 solidified part of the envelope 2 forms a movable bottom of the mold 10.
  • a ring not shown can be mounted on the shaft 1 to form the movable base of the mold 10 at the start of the casting of molten filler metal 5 in said mold.
  • the device according to the invention allows about 10 kg / min of filler metal to be poured and solidified.
  • 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.

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 DEG 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

La présente invention a pour objet un procédé et un dispositif 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.The subject of the present invention is a method and a device for 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.

Jusqu'à présent, les procédés de réalisation d'une enveloppe métallique sur une âme de forme allongée consistent, à déplacer l'âme verticalement et coxialement 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 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 (voir par exemple US-A-3455372).Until now, the methods of producing a metal casing on an elongated core consist of moving the core vertically and coxially in an ingot mold whose internal wall provides space with the external wall of the core and whose the internal section corresponds substantially to the section of said envelope, to flow, into said space, a molten filler metal, intended to form said envelope, to heat the upper part of the mold and to cool the lower part of said mold to solidify said filler metal (see for example US-A-3455372).

Ces procédés permettent d'assurer la liaison 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.These methods make it possible to ensure the connection of the metal casing to 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.

On connaît plus particulièrement dans le 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 lingotière en matériau réfractaire et qui est associée à un cristallisoir en cuivre refroidi par circulation d'eau.We know more particularly in JP-A-6160256, a process for preparing a metal casing on a core, in which the molten filler metal intended to form said casing is maintained at temperature, before it solidifies, in an ingot mold made of refractory material and which is associated with a copper crystallizer cooled by circulation of water.

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 l'enveloppe et le métal constituant l'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 soul.

Le procédé décrit dans le brevet JP-A-6160256 a pour principal inconvénient de conduire à une préparation lourde et onéreuse de l 'âme et à des investissements 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 expensive preparation of the core and to high investments, in particular in high frequency induction heating systems of the filler metal.

L'invention a pour but d'éviter les inconvénients 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 l'âme juste avant le dépôt du métal d'apport.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 pickling at hot of the outer wall of the core just before the deposition of the filler metal.

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 :

  • on déplace l'âme verticalement et coaxialement 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,
  • on coule, dans ledit espace, un métal d'apport en fusion destiné à former ladite enveloppe,
  • on chauffe la partie supérieure de lingotière,
  • et on refroidit la partie inférieure de ladite lingotière pour solidifier ledit métal d'apport, caractérisé en ce que :
  • on déplace l'âme dans la lingotière en lui communiquant une oscillation verticale continue associée au mouvement vertical de descente de ladite âme,
  • on recouvre le métal d'apport en fusion, à l'intérieur de la lingotière et au niveau de la partie supérieure de ladite lingotière, par un laitier électroconducteur,
  • on chauffe le laitier électroconducteur à une température supérieure à 1450°C,
  • et on communique audit laitier électroconducteur un mouvement de rotation autour de la l'âme pour effectuer le décapage de la paroi externe de ladite âme avant son contact avec le métal d'apport en fusion.
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,
  • a molten filler metal intended to form said envelope is poured into said space,
  • the upper part of the mold is heated,
  • and we cool the lower part of said ingot mold for solidifying said filler metal, characterized in that:
  • 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 mold and at the level of the upper part of said mold, by an electroconductive slag,
  • the electroconductive slag is heated to a temperature above 1450 ° C.,
  • and communicating to said electroconductive 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 l'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,
  • on fond le métal d'apport dans un four à induction.
According to other characteristics of the invention:
  • the molten filler metal is poured into the space provided 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,
  • the filler metal is melted in an induction furnace.

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 sensiblement 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 qu'il comporte des moyens communiquant une oscillation verticale continue à l'âme associée à son mouvement vertical de descente lors de la coulée du métal d'apport et la lingotière est formée d'un anneau supérieur de chauffage et de mise en rotation d'un laitier électroconducteur disposé au-dessus du métal d'apport dans ladite lingotière, d'un anneau inférieur muni desdits moyens de refroidissement et d'une couronne isolante électriquement et séparant lesdits anneaux.The invention also relates to a device for producing a metal casing on an elongated core, for the implementation of 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 mold comprising at its lower part cooling means for solidifying the filler metal, characterized in that it comprises means communicating a continuous vertical oscillation to the core associated with its vertical downward movement during the casting of the filler metal and the ingot mold is formed by an upper ring for heating and for rotating an electrically conductive slag disposed above the filler metal in said ingot mold, a lower ring provided with said cooling means and an electrically insulating ring separating said rings.

Selon d'autres caractéristiques de l'invention :

  • l'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 l'âme,
  • le dispositif comporte un four de maintien en température du métal d'apport en fusion associé à la lingotière,
  • le four de maintien en température est formé par un four à induction.
According to other characteristics of the invention:
  • 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,
  • the device comprises a furnace for maintaining the temperature of the molten filler metal associated with the ingot mold,
  • the temperature maintenance oven is formed by an induction oven.

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 partiellement arrachée du dispositif selon l'invention.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 partially cutaway perspective view of the device according to the 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.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.

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 l'arbre 1.To this end, the device comprises an ingot mold 10 intended to receive a molten filler metal 5 constituting the metal envelope 2 and which is crossed by the shaft 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 supérieur 1a par exemple par une bride 3 à un organe de support approprié, non représenté, et, d'autre part guidé à son extrémité inférieure 1b.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 1a for example by a flange 3 from a suitable support member, not shown, and , on the other hand guided at its lower end 1b.

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 1c de l'arbre 1 pour le déversement du métal d'apport 5 en fusion destiné à former l'enveloppe métallique 2, comme on le verra ultérieurement.The internal wall 10a of the mold 10 provides a space 4 with the external wall 1c of the shaft 1 for the pouring of the 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 11a de façon à former une self d'induction à une spire et une première électrode de chauffage par effet Joule. Une seconde électrode de chauffage est formée par l'arbre 1.In addition, the upper ring 11 has a vertical slot 11a so as to form an induction coil with a turn and a first heating electrode by Joule effect. A second heating electrode is formed by the shaft 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.The rings 11 and 12 include cooling means, not shown, which are formed for example by at least one water circulation circuit formed in said rings.

L'anneau supérieur 11 comporte également un entonnoir 14 destiné à assurer l'écoulement du métal d'apport 5 dans l'espace 4 et qui est contenu dans un four 6 de maintien en température dudit métal d'apport.The upper ring 11 also includes 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.

Ce four 6 est par exemple constitué par un four à induction.This oven 6 is for example constituted by an induction oven.

Après avoir suspendu l'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'intermédiaire de l'entonnoir 14.After having suspended the shaft 1 vertically and coaxially in the ingot 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 via funnel 14.

Le métal d'apport 5 dans l'espace 4 est recouvert d'un laitier électroconducteur 7 au niveau de l'anneau supérieur 11 de la lingotière 10.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 mold 10.

Ce laitier électroconducteur 7 est chauffé par effet Joule à une température supérieure à 1450°C et par exemple à 1500°C par les électrodes de chauffage formées respectivement par l'anneau supérieur 11 et l'arbre 1.This electroconductive slag 7 is heated by the Joule effect to a temperature higher than 1450 ° C. and for example to 1500 ° C. by the heating electrodes formed respectively by the upper ring 11 and the shaft 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.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 électroconducteur 7 est égale à environ 1 tour par seconde ce qui permet d'effectuer un décapage de la paroi externe 1c de l'arbre 1 juste avant que cette paroi entre en contact avec le métal d'apport 5 en fusion destiné à former l'enveloppe 2.The speed of rotation of the electroconductive slag 7 is equal to approximately 1 revolution per second, which makes it possible to strip 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.

Le mouvement de rotation du laitier électroconducteur 7 permet de mettre l'arbre 1 en condition idéale pour réaliser un soudage parfait entre le métal de l'arbre 1 et le métal de l'enveloppe 2.The rotational movement of the electrically conductive slag 7 makes it possible to put the shaft 1 in 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 l'espace 4 traverse le laitier électroconducteur 7 et se solidifie progressivement en entrant en contact avec l'anneau inférieur 12 qui est refroidi.The molten filler metal 5 poured in 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 l'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 progressivement sur ledit arbre 1.Thus, due to the descent of the shaft 1 through the ingot mold 10, the envelope 2 is gradually formed on said shaft 1.

La partie solidifiée de l'enveloppe 2 forme un fond déplaçable de la lingotière 10.The solidified part of the envelope 2 forms a movable bottom of the mold 10.

Selon une variante, une bague, non représentée peut être montée sur l'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.Alternatively, a ring, not shown can be mounted on the shaft 1 to form the movable base of the mold 10 at the start of the casting of molten filler metal 5 in said 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.On the other hand, the vertical downward movement of the shaft 1 according to a continuous oscillation allows the demoulding of the composite product thus produced, from the mold 10.

Le dispositif selon l'invention permet de couler et de solidifier environ 10kg/mn de métal d'apport.The device according to the invention allows about 10 kg / min of filler metal to be poured and solidified.

Le dispositif selon l'invention peut permettre 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 l'anneau inférieur 12 et par l'arbre 1 produisent des porosités à l'interface de ces deux fronts.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.

Le procédé et le dispositif selon l'invention sont parfaitement adaptés à la production de cylindres de laminoir à chaud et à froid.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 (7)

  1. Method for producing a metal shell (2) on an elongate core (1) having a metallurgical composition different from that of the said shell (2), in order to form a bimetallic composite product such as, for example, a rolling-mill roll, in which method:
    - the core (1) is moved vertically and coaxially through a mould (10), the inner wall (10a) of which, together with the outer wall (1c) of the core (1), provides a space (4) and the internal cross-section of which corresponds substantially to the cross-section of the said shell (2),
    - a molten addition metal (5), intended to form the said shell (2), is cast into the said space (4),
    - the upper part of the mould (10) is heated,
    - and the lower part of the said mould (10) is cooled in order to solidify the said addition metal (5), characterized in that:
    - the core (1) is moved through the mould (10) while imparting to it a continuous vertical oscillation combined with the vertical downward movement of the said core (1),
    - the molten addition metal (5) is covered by an electrically conductive slag (7) inside the mould (10) and at the upper part (11) of the said mould (10),
    - the electrically conductive slag (7) is heated to a temperature above 1450°C,
    - and a rotational movement around the core (1) is imparted to the said electrically conductive slag (7) in order to descale the outer wall (1c) of the said core before it comes into contact with the molten addition metal (5).
  2. Method according to claim 1, characterized in that the molten addition metal (5) is cast into the space (4) provided between the inner wall (10a) of the mould (10) and the outer wall (1c) of the core (1) by pouring the said addition metal which has been melted beforehand in a furnace (6) associated with the said mould (10).
  3. Method according to Claims 1 and 2, characterized in that the addition metal (5) is melted in an induction furnace.
  4. Device for producing a metal shell (2) on an elongate core (1), for the implementation of the method according to one of Claims 1 to 3, the said device comprising a mould (10) of internal cross-section corresponding substantially to the cross-section of the said shell (2) and the inner wall (10a) of which, together with the outer wall (1c) of the said core (10), provides a space (4) for a molten addition metal (5) intended to form the said shell (2), the said mould (10), at its lower part, including cooling means for solidifying the said addition metal (5), characterized in that it includes means which impart a continuous vertical oscillation to the core combined with its vertical downward movement during the casting of the addition metal and the mould (10) is formed by an upper annulus (11) for heating and for rotating an electrically conductive slag (7) placed above the addition metal (5) in the said mould (10), by a lower annulus (12) provided with the said cooling means and by an electrically insulating ring (13) which separates the said annuli (11, 12).
  5. Device according to Claim 4, characterized in that the upper annulus (11) is split vertically in order to form a one-turn induction coil and a first electrode for heating the electrically conductive slag (7) by the Joule effect, a second electrode for heating the said electrically conductive slag (7) by the Joule effect being formed by the core (1).
  6. Device according to Claim 4, characterized in that it includes a furnace (6) for maintaining the temperature of the molten addition metal (5) associated with the mould (10).
  7. Device according to Claim 6, characterized in that the furnace (6) for maintaining the temperature is formed by an induction furnace.
EP94912583A 1993-04-02 1994-04-01 Method and device for forming a metal sheath on an elongate core Expired - Lifetime EP0693011B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9303927 1993-04-02
FR9303927A FR2703278B1 (en) 1993-04-02 1993-04-02 Method and device for producing a metal casing on an elongated core.
PCT/FR1994/000372 WO1994022619A1 (en) 1993-04-02 1994-04-01 Method and device for forming a metal sheath on an elongate core

Publications (2)

Publication Number Publication Date
EP0693011A1 EP0693011A1 (en) 1996-01-24
EP0693011B1 true EP0693011B1 (en) 1997-08-06

Family

ID=9445702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94912583A Expired - Lifetime EP0693011B1 (en) 1993-04-02 1994-04-01 Method and device for forming a metal sheath on an elongate core

Country Status (6)

Country Link
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
FR2773729A1 (en) * 1998-01-21 1999-07-23 Marichal Ketin & Cie Method for the fabrication of a metal envelope on a shaft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976477B1 (en) 1997-03-18 2003-10-01 Zakrytoe Aktsionernoe Obschestvo "Elmet-Rol-Gruppa Medovara" Electroslag facing process

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396778A (en) * 1964-08-24 1968-08-13 Lukens Steel Co Apparatus for cast cladding
FR1449220A (en) 1965-10-04 1966-08-12 Inst Elektroswarki Patona Metal ingot casting process
US3455372A (en) * 1967-03-08 1969-07-15 Hidesuke Yamamoto Continuous padding method using high frequency current
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
US4726417A (en) * 1986-09-12 1988-02-23 Hitachi Metals, Ltd. Adamite compound roll

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2773729A1 (en) * 1998-01-21 1999-07-23 Marichal Ketin & Cie Method for the fabrication of a metal envelope on a shaft

Also Published As

Publication number Publication date
ES2106526T3 (en) 1997-11-01
FR2703278A1 (en) 1994-10-07
ATE156398T1 (en) 1997-08-15
EP0693011A1 (en) 1996-01-24
WO1994022619A1 (en) 1994-10-13
DE69404832T2 (en) 1998-01-22
FR2703278B1 (en) 1995-07-07
DE69404832D1 (en) 1997-09-11

Similar Documents

Publication Publication Date Title
CA1106134A (en) Metal casting process
EP0275228B1 (en) Process and device for melting and continuously casting metals
CH632685A5 (en) PROCESS FOR SHELL MOLDING WITH DIRECT COOLING OF NON-FERROUS METALS, APPARATUS FOR IMPLEMENTING SAME AND APPLICATION THEREOF.
FR2537897A1 (en) CONTINUOUS CASTING OF METAL
EP0092477B1 (en) Process and apparatus for casting hollow steel ingots
EP0693011B1 (en) Method and device for forming a metal sheath on an elongate core
EP0190458B1 (en) Process and apparatus for continuously manufacturing spheroidal graphite cast iron pipes with a controlled microstructure
EP0005676A2 (en) Electromagnetic agitating process applied to continuous casting
EP0743114B1 (en) Process for the lubrication of the walls of a continuous casting mould for metals and mould for carrying out the process
EP0242347A2 (en) Apparatus for metal slurry casting
BE1011970A3 (en) Process development of a metal jacket on a tree.
BE1000221A6 (en) Rotary cooler for casting of semi-solidified metals - has water cooled tube to cool part of poured metal to solidification range, improving homogeneity of prod.
FR2704786A3 (en) Method for continuous batch casting of metals, particularly steel, and ingot mould for implementing it
FR2674154A1 (en) Method for moulding castings such as rolling mill rolls and forge ingots, device for implementing the method, and roll or forge ingot obtained
CH314391A (en) Continuous or semi-continuous casting process of metals and alloys
BE895357A (en) Continuous casting of metals - with heated mould and cooled dummy bar
EP0452294B1 (en) Method and device for the continuous casting of a metal
FR2525131A1 (en) Casting large hollow steel ingots - using gas cooled metal core
BE566657A (en)
BE528885A (en)
JPS5838655A (en) Production of rolling roll for bar steel
BE503512A (en)
BE666483A (en)
FR2558399A1 (en) Improvements to ingot moulds for the continuous casting of metals, and particularly of steel
WO2007065983A1 (en) Device for electromagnetically stirring liquid metal for a continuous casting line

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19950928

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE ES GB IT SE

17Q First examination report despatched

Effective date: 19960306

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

TPAD Observations filed by third parties

Free format text: ORIGINAL CODE: EPIDOS TIPA

ITF It: translation for a ep patent filed

Owner name: INVENTION S.N.C.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

TPAD Observations filed by third parties

Free format text: ORIGINAL CODE: EPIDOS TIPA

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE ES GB IT SE

REF Corresponds to:

Ref document number: 156398

Country of ref document: AT

Date of ref document: 19970815

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19970813

REF Corresponds to:

Ref document number: 69404832

Country of ref document: DE

Date of ref document: 19970911

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2106526

Country of ref document: ES

Kind code of ref document: T3

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: ELMET-ROLL

Effective date: 19980504

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBO Opposition rejected

Free format text: ORIGINAL CODE: EPIDOS REJO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAE Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOS REFNO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

R26 Opposition filed (corrected)

Opponent name: ELMET-ROLL

Effective date: 19980504

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION REJECTED

27O Opposition rejected

Effective date: 20021025

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

REG Reference to a national code

Ref country code: ES

Ref legal event code: PC2A

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20120425

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20120322

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20130411

Year of fee payment: 20

Ref country code: GB

Payment date: 20130415

Year of fee payment: 20

Ref country code: DE

Payment date: 20130409

Year of fee payment: 20

Ref country code: BE

Payment date: 20130430

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20130422

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69404832

Country of ref document: DE

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20140331

BE20 Be: patent expired

Owner name: AKERS FRANCE

Effective date: 20140401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20140331

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK07

Ref document number: 156398

Country of ref document: AT

Kind code of ref document: T

Effective date: 20140401

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20140402

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20140926

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20140402