EP0777542B1 - Bimetal foundery part used as a wear part in vertical crushers, fabrication method and utilisation in vertical crushers - Google Patents

Bimetal foundery part used as a wear part in vertical crushers, fabrication method and utilisation in vertical crushers Download PDF

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Publication number
EP0777542B1
EP0777542B1 EP95928904A EP95928904A EP0777542B1 EP 0777542 B1 EP0777542 B1 EP 0777542B1 EP 95928904 A EP95928904 A EP 95928904A EP 95928904 A EP95928904 A EP 95928904A EP 0777542 B1 EP0777542 B1 EP 0777542B1
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EP
European Patent Office
Prior art keywords
core
hub
cast iron
ductile
connecting elements
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EP95928904A
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German (de)
French (fr)
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EP0777542A1 (en
Inventor
Norbert Guerard
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Magotteaux International SA
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Magotteaux International SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
    • 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
    • B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/004—Shape or construction of rollers or balls
    • B02C15/005—Rollers or balls of composite construction
    • 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
    • B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools

Definitions

  • the present invention relates to a foundry part bi-metallic serving as a wearing part in grinders, in particularly so-called vertical shredders. It applies also to a method of producing such a part and to its use in grinders of this type.
  • Vertical shredders have rollers turning on a grinding track with vertical axis
  • the grinding rollers are mounted on a central hub and are provided at their periphery with wearing parts which can be in the form of segments or which can be also made in one piece.
  • the wearing part is particularly difficult to be machined after casting because of its specific properties, namely its high hardness, while tolerances less than H9 are required for this machining.
  • Document GB-2 078 575 A describes parts of weldable wear consisting of a weldable steel part provided with protuberances which, after being placed in a mold is subjected to a metallurgical-mechanical bond obtained by casting a cast iron. These parts are described as may be suitable for various uses such as parts machine and tools. We propose to use for the part wear and tear low spheroidal graphitic cast iron wear resistance and low weldability in which a hard metal is incorporated.
  • the combined metallurgical-mechanical connection is described as a means of compensating for the tensions resulting from differences in coefficient of expansion between the alloy of base (graphite cast iron) and reinforcement material incorporated in the wear part, thus ensuring a good connection between this wear part and the part weldable and avoiding the propagation of micro-cracks.
  • Document AU-B-44415/89 (617891) describes a core with mechanical connection element in the form inserts, joined together by pouring an envelope in white cast iron constituting a non-ductile wear material. These inserts are welded together however, after cooling of the white cast iron.
  • the invention essentially aims to propose a new design of wear parts for grinders of the type mentioned which provides a series of specific benefits, in particularly better resistance to cracking, absence of deformation of the hub under stresses applied and generally more flexibility in the system for attaching wear parts to the hub. We also aim to achieve significant savings in level of manufacturing price and lifespan of rooms.
  • the invention relates to a bimetallic foundry part according to claim 1.
  • This type of part can be in the form of segments or as a single piece, for their mounting on the hub of the vertical grinder rollers.
  • the ductile iron used is preferably a cast iron from type GS (GGG 40 according to DIN 1693).
  • the step which is generally provided at the foot of the wear part for its connection to the hub can be adapted to the requirements of each manufacturer.
  • the specific shape of the studs is preferably chosen so as to provide simplified form nets rounded.
  • the parts according to the invention also make it possible to facilitate the weighting of the part in chromium cast iron and to obtain better mechanical properties thanks to the cooling effect of the ductile iron part.
  • the bimetallic coins as well thus avoid the need for a bonding solution metallurgical. This avoids the well known drawback a horizontal separation surface between the two metals sunk.
  • the studs can affect the shape of a dovetail.
  • the process for manufacturing such a part is particularly interesting due to the choice of materials implemented which allows the core to be cast first with the studs in a first mold and then, after having applied a refractory coating to prevent bonding metallurgical, to sink the envelope.
  • We finally proceed to a quenching heat treatment taking into account the nature of the components of the room and possibly the intended use, in particular the grinder and materials to be ground, according to the criteria well known to specialists in these materials.
  • a roller 3 is driven relative to axis 1 by turning through a hub 2 shown schematically on an axis 5 which can be slightly inclined (as shown) or horizontal, in view to grind the material fed between the roller and the track grinding 6.
  • the reference 7 represents the material to be ground fed centrally in the crusher. After grinding, the fine particles are extracted from the mill and the most large are returned to grinding track 6 by a air flow schematized by the arrow 9.
  • the roller 3 is rounded on its peripheral part and the track has a shape corresponding.
  • the actual wear part bearing the mark general 11 is formed by a core 13 comprising studs 15 obtained from foundry on which an envelope is poured 17.
  • the essential characteristic of the invention is the fact that the core 13 and connecting elements in the form of studs 15 from casting are formed from a material ductile, namely GS cast iron while the shell 17 is made in non-ductile alloys in particular chrome irons ⁇ 64 Rc hardness used usually as wearing parts.
  • the offset of the envelope 17 with respect to the core 13 can be adapted to the different manufacturers' requirements in a simple way, especially since the peripheral junction line 21 between the envelope 17 and the core 13 is advantageously located in the internal angle of offset, which avoids exposure of this line to the direct action of the material to be ground.
  • the process used to produce the part wear according to the invention is to sink first the core 13 with the studs 15; after applying a refractory coating on the core, place the part in a second mold and the envelope is poured 17. The assembly undergoes then a quenching heat treatment.
  • the casting of Figures 4 and 5 is a block bimetal of 230x275x150mm formed by a part corresponding to core 13 and studs 15 in GS cast iron (GGG40) and by a casing part 11 in chromium cast iron with a hardness greater than or equal to 64 Rc.
  • a refractory coating (not shown) is applied to this part to avoid reflow of studs and the risk of a metallurgical link with the chrome cast iron.
  • the bimetal block was then trimmed and quenched.
  • the tests are carried out in a SCHENK machine from maximum capacity of 2500 kN.
  • the applied signal is sinusoidal.
  • the assembly has been subjected to an oscillating compression load 100kN-2000kN generating maximum contact pressures 3 times greater than those experienced by a roller in service.
  • the assembly tested has not suffered any apparent degradation during 465,000 cycles.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Adornments (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The invention relates to a bimetal foundery part used as a wearing part in vertical crushers and its method of fabrication. The part comprises a core (13) made of a ductile cast iron provided with mechanical link elements such as bolts (15) which are made integral by casting of an envelope (17) made of a non ductile wearing material having a high chromium content. Such parts are intended to be mounted on the hub of a roller of a vertical axis crusher.

Description

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

La présente invention concerne une pièce de fonderie bimétallique servant de pièce d'usure dans des broyeurs, en particulier des broyeurs dits verticaux. Elle s'applique également à un procédé de réalisation d'une telle pièce et à son utilisation dans des broyeurs de ce type.The present invention relates to a foundry part bi-metallic serving as a wearing part in grinders, in particularly so-called vertical shredders. It applies also to a method of producing such a part and to its use in grinders of this type.

Arrière plan technologique de l'inventionTechnological background of the invention

Les broyeurs verticaux comportent des galets tournant sur une piste de broyage à axe vertical Les galets de broyage sont montés sur un moyeu central et sont pourvus à leur périphérie de pièces d'usure qui peuvent se présenter sous forme de segments ou qui peuvent être également constituées sous forme monobloc.Vertical shredders have rollers turning on a grinding track with vertical axis The grinding rollers are mounted on a central hub and are provided at their periphery with wearing parts which can be in the form of segments or which can be also made in one piece.

Ces pièces d'usure sont réalisées en fonte présentant une forte résistance à l'abrasion, notamment des fontes à haute teneur en chrome et, par conséquent sont très peu ductiles (leur valeur d'allongement de rupture est pratiquement égale à zéro). Les pièces d'usure sont généralement solidarisées à l'aide de clames au moyeu.A cause précisément de leur absence de ductilité, on peut observer sous les contraintes dues aux diverses sollicitations mécaniques l'apparition notamment de fissures qui se propagent dans les dites pièces. Divers autres inconvénients se manifestent dont, sous l'effet des contraintes, notamment une déformation du moyeu. Cette déformation du moyeu cause de considérables difficultés lors du remplacement des pièces d'usure et il est courant de devoir remplacer à la fois la pièce d'usure et le moyeu.These wear parts are made of cast iron with high resistance to abrasion, especially high chromium content and therefore are very little ductile (their elongation at break is practically zero). The wearing parts are generally joined by means of clamps to the hub. precisely from their lack of ductility, we can observe under the constraints due to various stresses mechanical, in particular the appearance of cracks which propagate in said rooms. Various other disadvantages manifest themselves which, under the effect of constraints, in particular a deformation of the hub. This deformation of the hub causes considerable difficulties when replacing parts wear and it is common to have to replace both the wear part and the hub.

De plus, la pièce d'usure est particulièrement difficile à usiner après coulée à cause de ses propriétés spécifiques, à savoir sa haute dureté, alors que des tolérances inférieures à H9 sont exigées pour ces usinages.In addition, the wearing part is particularly difficult to be machined after casting because of its specific properties, namely its high hardness, while tolerances less than H9 are required for this machining.

Dans le document GB-2 078 575 A on décrit des pièces d'usure soudables constituées d'une partie en acier soudable pourvue de protuberances qui, après avoir été placée dans une moule est soumise à une liaison métallurgico-mécanique obtenue en coulant une fonte. Ces pièces sont décrites comme pouvant convenir à divers usages telles que des pièces de machine et des outils. On propose d'utiliser pour la partie d'usure coulée une fonte graphitique sphéroïdale de faible résistance à l'usure et de faible soudabilité dans laquelle un métal dur est incorporé.Document GB-2 078 575 A describes parts of weldable wear consisting of a weldable steel part provided with protuberances which, after being placed in a mold is subjected to a metallurgical-mechanical bond obtained by casting a cast iron. These parts are described as may be suitable for various uses such as parts machine and tools. We propose to use for the part wear and tear low spheroidal graphitic cast iron wear resistance and low weldability in which a hard metal is incorporated.

La liaison combinée métallurgico-mécanique est décrite comme permettant de compenser les tensions résultant des différences de coefficient de dilatation entre l'alliage de base (fonte graphitique) et la matière de renforcement incorporée dans la partie d'usure, en assurant ainsi une bonne liaison entre cette partie d'usure et la partie soudable et en évitant la propagation des micro-fissures.The combined metallurgical-mechanical connection is described as a means of compensating for the tensions resulting from differences in coefficient of expansion between the alloy of base (graphite cast iron) and reinforcement material incorporated in the wear part, thus ensuring a good connection between this wear part and the part weldable and avoiding the propagation of micro-cracks.

Dans le document AU-B-44415/89 (617891), on décrit un noyau pourvu d'élément de liaison mécanique sous forme d'inserts, rendus solidaires par coulée d'une enveloppe en fonte blanche constituant un matériau d'usure non ductile. Ces inserts sont soudés ensemble cependant, après refroissement de la fonte blanche coulée.Document AU-B-44415/89 (617891) describes a core with mechanical connection element in the form inserts, joined together by pouring an envelope in white cast iron constituting a non-ductile wear material. These inserts are welded together however, after cooling of the white cast iron.

La Demanderesse s'est cependant aperçue qu'aucune de ces solutions n'est totalement satisfaisante d'une part parce qu'elle limite l'utilisation de compositions très dures pour la partie d'usure puisqu'il faut assurer cette liaison métallurgico-mécanique et d'autre part parce qu'une telle liaison n'empêche pas suffisamment la propagation des fissures et des micro-fissures. Ce phénomène est particulièrement observé dans le cas de grands broyeurs verticaux décrits ci-dessus.However, the Applicant has noticed that none of these solutions is not entirely satisfactory on the one hand because limit the use of very harsh compositions for the wear part since it is necessary to ensure this connection metallurgical-mechanical and secondly because such link does not sufficiently prevent the spread of cracks and micro-cracks. This phenomenon is particularly observed in the case of large shredders vertical described above.

Buts visés par l'inventionGoals of the invention

L'invention vise essentiellement à proposer une conception nouvelle des pièces d'usure de broyeurs du type mentionné qui assure une série d'avantages spécifiques, en particulier une meilleure résistance à la fissuration, une absence de déformation du moyeu sous les contraintes appliquées et de manière générale, une plus grande souplesse dans le système de fixation des pièces d'usure au moyeu. On vise également à réaliser d'importantes économies au niveau du prix de fabrication et de la durée de vie des pièces.The invention essentially aims to propose a new design of wear parts for grinders of the type mentioned which provides a series of specific benefits, in particularly better resistance to cracking, absence of deformation of the hub under stresses applied and generally more flexibility in the system for attaching wear parts to the hub. We also aim to achieve significant savings in level of manufacturing price and lifespan of rooms.

D'autres buts et avantages de l'invention apparaítront à la lecture du mémoire descriptif et des revendications.Other objects and advantages of the invention will appear on reading the specification and the claims.

Eléments caractéristiques de l'inventionCharacter-defining elements of the invention

L'invention concerne une pièce de fonderie bimétallique selon la revendication 1.The invention relates to a bimetallic foundry part according to claim 1.

Ce type de pièce peut se présenter sous forme de segments ou sous forme d'un élément monobloc, en vue de leur montage sur le moyeu des galets de broyeurs verticaux.This type of part can be in the form of segments or as a single piece, for their mounting on the hub of the vertical grinder rollers.

Dans le cas du montage de segments, ceci peut se réaliser par clamage ou boulonnage sur le moyeu; dans le cas d'éléments monobloc, l'assemblage a lieu par frettage, sans nécessité de souder ces élements sur le moyeu dans aucun des cas.In the case of mounting segments, this can be achieve by clamping or bolting on the hub; in the case monobloc elements, assembly takes place by shrinking, without need to weld these elements on the hub in none of the case.

Dans un cas comme dans l'autre, les risques de fissuration sont fortement réduits même sous des conditions de contraintes importantes puisque la zone de fixation des boulons ou des clames de solidarisation avec le moyeu est située dans la partie du noyau en fonte ductile.In either case, the risks of cracking are greatly reduced even under conditions significant constraints since the attachment area of the bolts or clamps securing to the hub is located in the part of the ductile iron core.

Le fait que la partie de liaison, qui est la plus fortement sollicitée, soit constituée par des goujons venus de coulée dans le noyau en fonte ductile, contribue à la résistance mécanique de l'ensemble.The fact that the connecting part, which is the most highly stressed, either made up of studs coming casting in the ductile iron core, contributes to the mechanical resistance of the assembly.

Les efforts générés par le travail de broyage - au lieu d'être transmis directement de la pièce d'usure sur le moyeu - sont ici repris d'abord par les goujons et ensuite par le noyau en fonte ductile.Ceci a pour conséquence d'une part que des fissurations ou des criques pouvant apparaítre sur la périphérie externe de la pièce d'usure ne se propagent pas dans la masse totale de la pièce d'usure. De plus, les déformations observées dans la technique des pièces d'usure mono-métalliques dures sur un moyeu doux sont ainsi évitées. Finalement, la surface de pose de la pièce d'usure qui doit être usinée pour s'adapter parfaitement au moyeu est constituée dans le cas présent par une fonte ductile ce qui facilite nettement l'usinage.The efforts generated by the grinding work - instead to be transmitted directly from the wear part to the hub - are here taken up first by the studs and then by the core made of ductile iron. cracks or cracks that may appear on the outer periphery of the wear part does not spread in the total mass of the wear part. Moreover, the deformations observed in the wear part technique hard mono-metallic on a soft hub are avoided. Finally, the installation surface of the wearing part which must be machined to fit the hub perfectly constituted in this case by ductile iron which significantly facilitates machining.

De manière générale, on observe une économie générale par la réduction du prix d'usinage, l'utilisation d'une pièce moins lourde, l'économie d'éléments d'alliage et une grande souplesse d'utilisation permettant de fixer la pièce d'usure bimétallique aussi bien par clamage que par boulonnage, ou dans le cas d'un élément monobloc, par frettage.In general, we observe an economy general by reducing the machining price, the use of a lighter part, the economy of alloying elements and a great flexibility of use allowing to fix the bimetallic wear part both by clamming and by bolting, or in the case of a monobloc element, by hooping.

La fonte ductile utilisée est de préférence une fonte du type GS (GGG 40 suivant la norme DIN 1693).The ductile iron used is preferably a cast iron from type GS (GGG 40 according to DIN 1693).

De même on dispose d'une plus grande liberté d'exécution des formes spécifiques non seulement parce qu'elles sont plus faciles à usiner mais également parce que les pièces selon cette conception particulière sont moins sollicitées mécaniquement et que, dans leur conception, il n'y a plus lieu de tenir compte dans la même mesure des efforts importants transmis. Ceci permet donc d'adapter la forme spécifique des pièces d'usure aux différents types de construction de broyeur vertical à galets. Likewise, we have greater freedom of execution specific forms not only because they are more easy to machine but also because the parts according to this particular design are less used mechanically and that in their design there is no longer place to take into account to the same extent the efforts important transmitted. This therefore makes it possible to adapt the shape specific wear parts to the different types of construction of vertical roller mill.

Le décrochement qui est généralement prévu au pied de la pièce d'usure pour son raccordement au moyeu peut être adapté aux exigences de chaque constructeur.The step which is generally provided at the foot of the wear part for its connection to the hub can be adapted to the requirements of each manufacturer.

La forme spécifique des goujons est de préférence choisie de manière à prévoir des filets simplifiés de forme arrondie.The specific shape of the studs is preferably chosen so as to provide simplified form nets rounded.

Les pièces selon l'invention permettent également de faciliter le masselottage de la partie en fonte au chrome et d'obtenir des meilleures propriétés mécaniques grâce à l'effet refroidisseur de la partie en fonte ductile. Il convient de noter que les pièces bimétalliques ainsi réalisées évitent ainsi, le recours à une solution de liaison métallurgique. Ceci permet d'éviter l'inconvénient bien connu d'une surface de séparation horizontale entre les deux métaux coulés.The parts according to the invention also make it possible to facilitate the weighting of the part in chromium cast iron and to obtain better mechanical properties thanks to the cooling effect of the ductile iron part. he should be noted that the bimetallic coins as well thus avoid the need for a bonding solution metallurgical. This avoids the well known drawback a horizontal separation surface between the two metals sunk.

De plus, l'absence de liaison métallurgique évite la propagation de la fissuration apparaissant dans la pièce d'usure périphérique dans le noyau.In addition, the absence of metallurgical bond prevents the propagation of cracking appearing in the room peripheral wear in the nucleus.

L'utilisation d'une forme arrondie pour les filets des goujons évite l'amorce de criques et contribue donc à une durée de vie prolongée des pièces.The use of a rounded shape for fillets studs avoids the initiation of cracks and therefore contributes to a extended service life of parts.

Selon une forme d'exécution spécifique de l'invention, les goujons peuvent affecter la forme d'une queue d'aronde.According to a specific embodiment of the invention, the studs can affect the shape of a dovetail.

Le procédé pour la fabrication d'une telle pièce est particulièrement intéressant par suite du choix des matériaux mis en oeuvre qui permet de couler d'abord le noyau avec les goujons dans un premier moule et ensuite, après avoir appliqué un enduit réfractaire destiné à empêcher une liaison métallurgique, de couler l'enveloppe. On procède finalement à un traitement thermique de trempe tenant compte de la nature des éléments constitutifs de la pièce et éventuellement de l'usage envisagé, en particulier du broyeur et des matériaux à broyer, selon les critères bien connus des spécialistes de ces matériaux.The process for manufacturing such a part is particularly interesting due to the choice of materials implemented which allows the core to be cast first with the studs in a first mold and then, after having applied a refractory coating to prevent bonding metallurgical, to sink the envelope. We finally proceed to a quenching heat treatment taking into account the nature of the components of the room and possibly the intended use, in particular the grinder and materials to be ground, according to the criteria well known to specialists in these materials.

L'invention sera décrite plus en détail en référence à une forme d'exécution préférée de celle-ci, au regard des dessins annexés. The invention will be described in more detail with reference to a preferred embodiment thereof, with regard to attached drawings.

D'autres détails et éléments caractéristiques de l'invention apparaítront à la lecture de la description qui suit.Other details and characteristic elements of the invention will appear on reading the description which follows.

Brève description des dessinsBrief description of the drawings

  • La figure 1 représente schématiquement la disposition d'un galet de broyage dans un broyeur à axe vertical.Figure 1 shows schematically the layout a grinding roller in a vertical axis mill.
  • La figure 2 représente à titre d'illustration d'une forme particulière de l'invention, un segment de galet selon l'invention;Figure 2 shows by way of illustration of a particular form of the invention, a roller segment according to the invention;
  • La figure 3 est une section AB dans la forme d'exécution de la figure 2;Figure 3 is a section AB in the embodiment of Figure 2;
  • Les figures 4 et 5 reprennent un exemple d'une pièce réalisée selon l'invention, la figure 4 étant une coupe suivant CD de la figure 5.Figures 4 and 5 show an example of a part produced according to the invention, FIG. 4 being a section according to CD of figure 5.

    • En se référant à la figure 1, on a indiqué par le repère 1 l'axe de rotation central du broyeur dit à axe vertical. De manière en soi connue, un galet 3 est entraíné par rapport à l'axe 1 en tournant grâce à un moyeu 2 représenté schématiquement sur un axe 5 qui peut être légèrement incliné (comme représenté) ou horizontal, en vue de broyer la matière alimentée entre le galet et la piste de broyage 6. Le repère 7 représente la matière à broyer alimentée centralement dans le broyeur. Après broyage, les particules fines sont extraites du broyeur et les plus grosses sont renvoyées vers la piste de broyage 6 par un courant d'air schématisé par la flèche 9.Referring to Figure 1, we have indicated by mark 1 the central axis of rotation of the so-called axis mill vertical. In known manner, a roller 3 is driven relative to axis 1 by turning through a hub 2 shown schematically on an axis 5 which can be slightly inclined (as shown) or horizontal, in view to grind the material fed between the roller and the track grinding 6. The reference 7 represents the material to be ground fed centrally in the crusher. After grinding, the fine particles are extracted from the mill and the most large are returned to grinding track 6 by a air flow schematized by the arrow 9.

    Ainsi qu'on le notera, le galet 3 est arrondi sur sa partie périphérique et la piste présente une forme correspondante.As will be noted, the roller 3 is rounded on its peripheral part and the track has a shape corresponding.

    La pièce d'usure à proprement parler portant le repère général 11 est formée par un noyau 13 comportant des goujons 15 obtenus de fonderie sur lesquels est coulée une enveloppe 17.The actual wear part bearing the mark general 11 is formed by a core 13 comprising studs 15 obtained from foundry on which an envelope is poured 17.

    La caractéristique essentielle de l'invention est le fait que le noyau 13 et des éléments de liaison sous forme de goujons 15 venus de coulée sont formés en un matériau ductile, à savoir de la fonte GS tandis que l'enveloppe 17 est réalisée dans les alliages non-ductiles en particulier des fontes au chrome de dureté ≥ 64 Rc utilisées habituellement comme pièces d'usure.The essential characteristic of the invention is the the fact that the core 13 and connecting elements in the form of studs 15 from casting are formed from a material ductile, namely GS cast iron while the shell 17 is made in non-ductile alloys in particular chrome irons ≥ 64 Rc hardness used usually as wearing parts.

    Il convient de noter que le décrochement de l'enveloppe 17 par rapport au noyau 13 peut être adapté aux différentes exigences des constructeurs de manière simple, d'autant que la ligne de jonction périphérique 21 entre l'enveloppe 17 et le noyau 13 se situe avantageusement dans l'angle interne de décrochement, ce qui évite une exposition de cette ligne à l'action directe de la matière à broyer.It should be noted that the offset of the envelope 17 with respect to the core 13 can be adapted to the different manufacturers' requirements in a simple way, especially since the peripheral junction line 21 between the envelope 17 and the core 13 is advantageously located in the internal angle of offset, which avoids exposure of this line to the direct action of the material to be ground.

    On réalise de cette manière un concept constructif particulièrement simple.We construct a constructive concept in this way particularly simple.

    Pratiquement la moitié de la masse de ce qui constituait antérieurement une pièce d'usure mono-métallique fixée sur un moyeu, est, selon l'invention constituée par le noyau ductile, ce qui entraíne une économie importante d'éléments d'alliage onéreux.Almost half the mass of what made up previously a mono-metallic wear part fixed on a hub, is, according to the invention constituted by the core ductile, which results in a significant saving of elements expensive alloy.

    Il convient de noter que si l'on a décrit une forme d'exécution de la pièce d'usure sous forme de segments, il est également possible de constituer une frette monobloc selon le concept inventif de l'invention.It should be noted that if a shape has been described of the wearing part in the form of segments, it it is also possible to build a one-piece fret according to the inventive concept of the invention.

    Le procédé mis en oeuvre pour la réalisation de la pièce d'usure selon l'invention consiste à couler en premier lieu le noyau 13 avec les goujons 15; après avoir appliqué un enduit refractaire sur le noyau, on place la pièce dans un second moule et on coule l'enveloppe 17. L'ensemble subit ensuite un traitement thermique de trempe.The process used to produce the part wear according to the invention is to sink first the core 13 with the studs 15; after applying a refractory coating on the core, place the part in a second mold and the envelope is poured 17. The assembly undergoes then a quenching heat treatment.

    Afin d'illustrer l'invention on décrira ci-après un exemple d'exécution d'une pièce selon l'invention et les résultats d'essais de laboratoire obtenus.In order to illustrate the invention, a description will be given below. example of execution of a part according to the invention and the laboratory test results obtained.

    Exemple 1Example 1 Essai bimétal à liaison mécaniqueMechanical bonded bimetal test

    La pièce coulée des figures 4 et 5 est un bloc bimétallique de 230x275x150mm formé par une partie correspondant au noyau 13 et aux goujons 15 en fonte GS (GGG40) et par une partie d'enveloppe 11 en fonte au chrome d'une dureté supérieure ou égale à 64 Rc.The casting of Figures 4 and 5 is a block bimetal of 230x275x150mm formed by a part corresponding to core 13 and studs 15 in GS cast iron (GGG40) and by a casing part 11 in chromium cast iron with a hardness greater than or equal to 64 Rc.

    Après ébarbage, un enduit réfractaire (non représenté) est appliqué sur cette partie pour éviter la refusion des goujons et le risque d'une liaison métallurgique avec la fonte au chrome.After deburring, a refractory coating (not shown) is applied to this part to avoid reflow of studs and the risk of a metallurgical link with the chrome cast iron.

    Après avoir placé ce bloc dans un second moule, la fonte au chrome a été coulée sur celui-ci.After placing this block in a second mold, the cast iron chrome was poured on it.

    Le bloc bimétal a ensuite été, ébarbé et trempé.The bimetal block was then trimmed and quenched.

    On a procédé à des essais de fatigue.Fatigue tests were performed.

    Les essais sont effectués dans une machine SCHENK de capacité maximale de 2500 kN.The tests are carried out in a SCHENK machine from maximum capacity of 2500 kN.

    Le signal appliqué est sinusoidal.The applied signal is sinusoidal.

    L'assemblage a subi une charge oscillante de compression 100kN-2000kN générant des pressions maximum de contact 3 fois supérieures à celles subies par un galet en service.The assembly has been subjected to an oscillating compression load 100kN-2000kN generating maximum contact pressures 3 times greater than those experienced by a roller in service.

    L'assemblage testé n'a pas subi de dégradation apparente durant 465 000 cycles.The assembly tested has not suffered any apparent degradation during 465,000 cycles.

    Claims (9)

    1. Bimetal smelting item for vertical grinding mills, comprising a core (13) made of a ductile cast iron and provided with mechanical connecting elements (15), joined together by casting an enveloppe (17) made of a non ductile wearing material with high chrome content, characterized in that the connecting elements (15) are formed with studs integrally casted with the ductile cast iron core (13).
    2. Item according to claim 1, characterized in that it is formed with segments or a monobloc element in view of its assembling onto the roller hub of vertical grinding mills.
    3. Item according to any one of claims 1 to 2, characterized in that the ductile cast iron being used is a GGG40 type cast iron according to DIN 1693 standard.
    4. Item according to any one of claims 1 to 3, characterized in that the wearing non ductile material is a chrome-based cast iron having a hardness higher than or equal to 64 Rc.
    5. Item according to any one of claims 1 to 4, characterized in that studs with rounded threads are used as connecting elements (15).
    6. Item according to any one of claims 1 to 8, characterized in that it comprises a peripheral disconnection and the peripheral jonction line (21) between the enveloppe (17) and the core (13) is located within the internal angle of this disconnection.
    7. Process for manufacturing an item according to any one of claims 1 to 6, characterized in that the core (13) is cast first with the connecting elements (15), a refractory coating is then applied to the core and connecting elements, the item is placed in a second mold and the enveloppe (17) is cast, and finally an annealing thermal treatment is effected.
    8. Use of items according to any one of claims 1 to 6 or obtained according to the process of claim 7, characterized in that it is assembled onto the hub (2) of a roller (3) of a so-called vertical axis grinding mill.
    9. Use according to claim 8, characterized in that the assembling onto said hub (2) is carried out either by clamping or bolting the core (13) onto the hub (2) or also by hooping the core (13) onto the hub (2).
    EP95928904A 1994-08-17 1995-08-16 Bimetal foundery part used as a wear part in vertical crushers, fabrication method and utilisation in vertical crushers Expired - Lifetime EP0777542B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    BE9400744 1994-08-17
    BE9400744A BE1008577A6 (en) 1994-08-17 1994-08-17 Room for foundry bimetallic part wear in vertical mills and manufacturing method thereof.
    PCT/BE1995/000074 WO1996005005A1 (en) 1994-08-17 1995-08-16 Bimetal foundery part used as a wear part in vertical crushers, fabrication method and utilisation in vertical crushers

    Publications (2)

    Publication Number Publication Date
    EP0777542A1 EP0777542A1 (en) 1997-06-11
    EP0777542B1 true EP0777542B1 (en) 1998-09-09

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    Application Number Title Priority Date Filing Date
    EP95928904A Expired - Lifetime EP0777542B1 (en) 1994-08-17 1995-08-16 Bimetal foundery part used as a wear part in vertical crushers, fabrication method and utilisation in vertical crushers

    Country Status (8)

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    EP (1) EP0777542B1 (en)
    KR (1) KR970704536A (en)
    AT (1) ATE170783T1 (en)
    BE (1) BE1008577A6 (en)
    DE (1) DE69504691T2 (en)
    DK (1) DK0777542T3 (en)
    ES (1) ES2122670T3 (en)
    WO (1) WO1996005005A1 (en)

    Families Citing this family (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    LU90006B1 (en) * 1997-01-15 1997-08-21 Magotteaux Int Insert for composite wearing parts process for manufacturing a wearing part using such inserts and wearing part thus produced
    EP3308861A1 (en) 2016-10-12 2018-04-18 Magotteaux International S.A. Crushing roller
    CN108745491B (en) * 2018-06-21 2021-02-19 湖北秦鸿新材料股份有限公司 High-wear-resistance roller sleeve of coal mill and preparation method thereof
    BE1027444B1 (en) 2020-02-11 2021-02-10 Magotteaux Int COMPOSITE WEAR PART
    CN117358359B (en) * 2023-12-01 2024-04-02 秦皇岛首启冶金设备有限公司 Split crushing tooth for crushing steel slag and processing technology thereof

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3682227A (en) * 1970-07-24 1972-08-08 Jerome C Motz Method of making bi-metal crusher liner
    JPS55103265A (en) * 1979-02-02 1980-08-07 Mitsubishi Heavy Ind Ltd Centrifugal casting method of double rolls
    SE431723B (en) * 1980-06-23 1984-02-27 Sandvik Ab WELDABLE Wear Part with High Durability
    JPS5768262A (en) * 1980-10-13 1982-04-26 Mitsubishi Heavy Ind Ltd As-cast high chromium type cast iron double centrifugal cast roll
    AU617891B2 (en) * 1988-11-02 1991-12-05 Mason & Cox Proprietary Limited Composite wear resistant product

    Also Published As

    Publication number Publication date
    EP0777542A1 (en) 1997-06-11
    ATE170783T1 (en) 1998-09-15
    DK0777542T3 (en) 1999-06-07
    KR970704536A (en) 1997-09-06
    WO1996005005A1 (en) 1996-02-22
    DE69504691T2 (en) 1999-03-18
    ES2122670T3 (en) 1998-12-16
    BE1008577A6 (en) 1996-06-04
    DE69504691D1 (en) 1998-10-15

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