EP3134212A1 - Grinding roller comprising inserts of an increased size - Google Patents

Grinding roller comprising inserts of an increased size

Info

Publication number
EP3134212A1
EP3134212A1 EP15716795.8A EP15716795A EP3134212A1 EP 3134212 A1 EP3134212 A1 EP 3134212A1 EP 15716795 A EP15716795 A EP 15716795A EP 3134212 A1 EP3134212 A1 EP 3134212A1
Authority
EP
European Patent Office
Prior art keywords
inserts
grinding roller
insert
roller
casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15716795.8A
Other languages
German (de)
French (fr)
Other versions
EP3134212B1 (en
Inventor
Norbert Guerard
Eric Lejeune
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.)
Magotteaux International SA
Original Assignee
Magotteaux International SA
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
Application filed by Magotteaux International SA filed Critical Magotteaux International SA
Priority to PL15716795T priority Critical patent/PL3134212T3/en
Publication of EP3134212A1 publication Critical patent/EP3134212A1/en
Application granted granted Critical
Publication of EP3134212B1 publication Critical patent/EP3134212B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers
    • 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
    • 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
    • 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
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the present invention relates to grinding rollers made by casting in the technical field of the foundry. These rollers are used in vertical axis mills for the grinding of various materials including coal, cement raw material, clinker or slag.
  • the invention more particularly relates to grinding rollers having inserts with higher massivity modules than those of the state of the art, possibly reinforced with agglomerates of infiltrable ceramic grains during casting.
  • the application EP 1 570 905 A1 discloses a grinding roller for a vertical axis mill comprising inserts with a low massivity module ( ⁇ 2.5).
  • This document highlights the various problems encountered in use with bimetallic grinding rollers comprising hard inserts made of high chromium cast iron, embedded in a ductile iron metal matrix.
  • the inserts are spaced relative to each other. This space is filled with ductile iron during the casting of the grinding roller, which generates a tab blocking the inserts against each other.
  • these weakly wear-resistant tabs widen, forming grooves between the inserts, which widen as one approaches the center of the grinding roller (see Fig.3). .
  • each insert has on at least one of its longitudinal flanks protruding ribs so as to form a space between two inserts juxtaposed.
  • preferential wear of the ductile alloy in the space is achieved, resulting in the formation of grooves between the inserts.
  • the massivity module is measured by the ratio of the volume to the surface. He is designated by V / S. This value, universally used by the founders, is notably taken into account in the calculation of the masselottage of the castings because, to obtain a sound part, it is appropriate that the weight has a ratio V / S higher than that of the piece to be cast.
  • V / S module depends on the choice of the length unit adopted.
  • V / S a 3 / (6 to 2 ) is a / 6.
  • V / S module will always be expressed in centimeters.
  • the object of the present invention is to limit the disadvantages of the state of the art by minimizing the presence of grooves formed by the interstices between the inserts of a grinding roller. To reduce this number of grooves, it is necessary to increase the size and massiveness module of these inserts. With more massive inserts, the latent heat available during casting will be higher and allow easier infiltration infiltrable ceramic reinforcements thicker. In corolar, the invention therefore allows the increase of the thickness of the ceramic reinforcement of the insert. By improving the conditions of infiltration of the reinforcement by the casting metal, one can use thicker reinforcements which in turn improve the wear resistance of the assembly.
  • the present invention discloses a grinding roller for mills vertical axis, made by casting in the foundry, said roller having inserts with a massivity module V / S between 3 and 5 cm, preferably between 3.2 and 4.5 cm, said inserts being embedded in a metal matrix composed of ductile iron or steel.
  • the invention comprises at least one or a combination of the following features:
  • the grinding roller comprises inserts with a massivity module V / S of between 3.4 and 4 cm; the inserts are arranged against each other, leaving only intermittent recesses between two inserts and allowing, during casting, to generate a dowel type connecting element improving the attachment of the insert in the metal matrix;
  • the stud type connecting member has undercuts
  • the inserts are not arranged parallel to the axis of rotation of said roller, but form an angle less than 45 ° with this axis;
  • the inserts have a curvature along their longitudinal axis
  • the inserts have an "S" shape along the longitudinal axis
  • the insert comprises one or more ceramic reinforcements infiltrable by the casting metal
  • said ceramic reinforcement is selected from alumina, zirconia, alumina-zirconia, metal nitrides, metal carbides and borides or mixtures thereof.
  • the present invention also discloses a vertical axis mill comprising a grinding roller according to the invention.
  • Figure 1 shows, according to the state of the art, a section of a vertical mill in operation and having a plurality of grinding rollers.
  • Figure 2a shows a three-dimensional view of a grinding roller according to the state of the art with inserts low massivity module and spaces between the inserts.
  • Figure 2b shows a three-dimensional view of an insert with low massivity module having spacing protuberances according to the state of the art.
  • Figure 3 shows, with a cross-sectional view, the space remaining between two adjacent inserts according to the state of the art and the possibility of forming larger and wider grooves between the inserts at the end. as they deepen.
  • FIG. 4 represents a three-dimensional view of an insert with a low massivity module with ceramic reinforcement and comprising spacers according to the state of the art.
  • Figure 5 shows the comparative curves of the number of inserts in the case of inserts according to the state of the art (V / S ⁇ 2.8 cm, squares on the graph) and inserts according to the invention (V / S> 3cm, tiles on the graph).
  • the number of inserts is reduced in the grinding rollers according to the invention.
  • Figure 6a shows in section two inserts according to the invention arranged side by side with spacing protuberances to maintain a minimum gap between two inserts. According to the invention, the number of grooves is limited by increasing the massiveness of the insert.
  • Figure 6b shows a three-dimensional view of the insert shown in Figure 6a.
  • Figure 7a shows in section two inserts with ceramic reinforcement according to the invention arranged against each other with an intermittent recess.
  • FIG. 7b represents a three-dimensional view of one of the two inserts of FIG.
  • This recess will, during casting, to form a connection element similar to a stud with undercuts to improve the attachment of the insert in the metal matrix.
  • the insert also shows the positioning of an infiltratable ceramic reinforcement by the casting metal increasing the wear resistance.
  • Figures 8a and 8b illustrate the same embodiment of the invention as that of Figures 7a and 7b with however an insert bent in the direction of its longitudinal axis in the form of "S".
  • This variant shaped "S" allows the groove between the inserts not to meet, during grinding, the material to be crushed frontally and at an angle less than 90 °.
  • FIG. 9 represents the same roller as that of FIG. 2a but with inserts with a higher mass modulus according to the invention.
  • FIG. 10a shows an insert according to the state of the art as used in a Loesche ® LM46 / 4 grinding roller and whose comparative test results are shown in Table 1.
  • Figures 11a and 12a show inserts according to the invention as used in a roller Loesche ® LM46 / 4 grinder and whose test results are also shown in Table 1.
  • Figures 11b and 12b represent respectively cuts according to BB.
  • Figure 13a shows a three-dimensional view of an insert according to one of the preferred embodiments of the present invention.
  • two of these inserts are arranged against each other leaving only an intermittent recess variable diameter in a radial direction on the grinding roller.
  • the recess will allow the formation, during casting, of a stud type connecting element with undercuts.
  • the insert also comprises a ceramic reinforcement infiltrable by the casting metal.
  • Figure 14 shows a three-dimensional view of a variant of an insert used in the roller according to the invention wherein the recess is located on the side face in the axial direction of the insert. This recess will, during casting, generate a connecting element in the axial direction of the grinding roller.
  • An infiltratable ceramic reinforcement by the casting metal is also present in this embodiment.
  • Figures 15 and 16 show an embodiment of the invention in which the inserts are not positioned parallel to the axis of rotation of the grinding roller, but form an angle less than 45 ° with this axis.
  • This type of arrangement has the advantage that the groove between the inserts is biased during the grinding of the material to be grinded which has the effect of less deterioration of the surface of the grinding roller and therefore a longer life of the -this.
  • the connecting element will have a kind of "stud" which may include undercuts.
  • ceramic reinforcement or agglomerate ceramic grains located in the insert also called “cake”, “padding” or “wafer” in English.
  • the grooves between the inserts 2 of a grinding roller 1 constitute a preferential wear area which not only adversely affects the life of the grinding roller 1, but also the grinding efficiency and the quality crushed product. These grooves can also be a source of unwanted vibrations during the operation of the mill 6. The wear is further accentuated in the case of inserts reinforced by infiltrable ceramics 5 because, by being created, the groove deforce the edges of the insert 2, the optional ceramic reinforcement 5 therefore has a tendency to crumble and wear more quickly.
  • the depth of infiltration depends on the latent heat available and therefore the amount of liquid metal available to achieve the infiltration.
  • the quantity of metal available for a given insert volume is insufficient to correctly infiltrate a ceramic reinforcement beyond a thickness of about 50 mm.
  • the infiltrable ceramic reinforcement 5 is sometimes called slab or even
  • Powder "cake” or “wafer” in English and generally consists of an agglomerate of ceramic grains leaving gaps to let penetrate the casting metal. He is well known to the skilled person. In terms of composition, it is generally, without pretention to exhaustivity, oxides such as alumina, zirconia, alumina-zirconia, silica or metal nitrides, metal carbides such as carbide titanium or tungsten carbide, borides or mixtures of these various constituents.
  • the massivity module of the insert is therefore directly related to the infiltration capacity of infiltrable ceramic reinforcement 5 of the insert 2 by the casting metal 4.
  • the number of inserts placed on the periphery of the grinding roller 1 is generally determined empirically. by the dimension of the insert in order to obtain sufficient mechanical strength of the roller in use (see Fig. 5).
  • the thickness of the ceramic reinforcement 5 is set at a value less than about 50 mm to ensure good infiltration during casting.
  • the lengths of the insert 2 and the ceramic backing 5 are approximately equal to the width of the grinding roll 1.
  • the width of the ceramic backing 5 is generally about the width of the insert (see Fig. 4).
  • the number of inserts as a function of the outer diameter of the roller is given by the upper curve of Figure 5.
  • the inserts placed in the grinding rollers have a ratio V / S between 1 and 2.8 cm (see Fig. 2a).
  • the V / S ratio of the inserts must be between 3 and 5 cm, preferably between 3.2 and 4.5 cm and particularly preferably between 3.4 and 4. cm.
  • Figure 13a shows an insert 2 designed according to a preferred embodiment of the invention. It has, on the lateral faces, cylindrical recesses 3 which alternate concave parts and convex parts. During the casting of the metal constituting the structure of the roller 1, the recesses 3 are filled with metal and the alternation of shape of the recess 3 can generate stud-type connecting elements with undercuts allowing a high performance fixing of inserts 2 in their metal matrix 4. They solidarisent the inserts 2 with the structure of the roller 1.
  • the insert 2 generally comprises a small thickness protrusion on the lower face, thus eliminating the risk of sliding in the radial direction of the roller 1.
  • This small thickness protrusion may be in particular in the form of a tail of dovetail anchoring, as illustrated in particular in Figure 11b.
  • Figures 11 and 12 show solutions that differ in the thickness of the ceramic reinforcement 5 considered, given the importance of the solicitations encountered in service.
  • Some corrugated shapes of the inserts shaped "S", for example, illustrated in Figures 8a and 8b, create grooves of the same shape between the inserts during wear and can soften the shock generated by this groove thanks to the progressiveness of the meeting thereof with the bed of material to grind. This reduces the risk of vibrations.
  • the examples of shapes given in the present description are not limiting; other geometric shapes can of course be imagined and are part of the present invention. Examples
  • the three types of inserts 2 are shown in FIGS. 10, 11 and 12.
  • the inserts are cast in a type of cast iron of 3% by weight of carbon and 16% by weight of chromium (U19) and then integrated (embedded) in a grinding roller whose metal matrix consists of a spheroidal graphite cast iron type GGG40.
  • the crushed material is a cement raw material.
  • the inserts 2 comprise infiltratable ceramic reinforcements 5 of the alumina-zirconia type.
  • the diameter of the rollers is 2000 mm in the 3 cases.
  • the number of hours of service represents the service life of the rollers.
  • Fig.l2a and b 47 3,5 560x130x90 15,000 4,575,000 + 50%

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Crushing And Grinding (AREA)
  • Ceramic Products (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

The present invention relates to a grinding roller for vertical shaft grinders, produced by foundry casting, said roller comprising inserts with a size modulus V/S of between 3 and 5 cm, preferably between 3.2 and 4.5 cm, said inserts being enclosed in a metal matrix consisting of ductile iron or of steel.

Description

GALET DE BROYAGE COMPORTANT DES INSERTS A MASSIVITE ELEVEE  MILLING ROLL COMPRISING HIGH MASS INSERTS
Objet de l'invention Object of the invention
[0001] La présente invention concerne des galets de broyage réalisés par coulée dans le domaine technique de la fonderie. Ces galets sont utilisés dans les broyeurs à axe vertical pour le broyage de différentes matières dont le charbon, le cru de cimenterie, le clinker ou le laitier. L'invention concerne plus particulièrement des galets de broyage comportant des inserts avec des modules de massivité plus élevés que ceux de l'état de la technique, éventuellement renforcés avec des agglomérats de grains de céramique infiltrables lors de la coulée.  The present invention relates to grinding rollers made by casting in the technical field of the foundry. These rollers are used in vertical axis mills for the grinding of various materials including coal, cement raw material, clinker or slag. The invention more particularly relates to grinding rollers having inserts with higher massivity modules than those of the state of the art, possibly reinforced with agglomerates of infiltrable ceramic grains during casting.
Etat de la technique State of the art
[0002] La demande EP 1 570 905 Al divulgue un galet de broyage pour broyeur à axe vertical comportant des inserts à faible module de massivité (<2,5). Ce document souligne les divers problèmes rencontrés en service avec des galets de broyage bimétalliques comprenant des inserts durs en fonte à haute teneur en chrome, englobés dans une matrice métallique en fonte ductile. Dans ce document, les inserts sont espacés les uns par rapport aux autres. Cet espace se remplit de fonte ductile lors de la coulée du galet de broyage, ce qui génère une languette bloquant les inserts les uns contre les autres. En cours de service, ces languettes peu résistantes à l'usure se creusent, formant des rainures entre les inserts, qui s'élargissent au fur et à mesure que l'on se rapproche du centre du galet de broyage (voir Fig.3).  [0002] The application EP 1 570 905 A1 discloses a grinding roller for a vertical axis mill comprising inserts with a low massivity module (<2.5). This document highlights the various problems encountered in use with bimetallic grinding rollers comprising hard inserts made of high chromium cast iron, embedded in a ductile iron metal matrix. In this document, the inserts are spaced relative to each other. This space is filled with ductile iron during the casting of the grinding roller, which generates a tab blocking the inserts against each other. During service, these weakly wear-resistant tabs widen, forming grooves between the inserts, which widen as one approaches the center of the grinding roller (see Fig.3). .
[0003] Le document US 5,238,046 présente ces mêmes désavantages. En effet, chaque insert comporte sur au moins l'un de ses flancs longitudinaux des nervures saillantes de manière à former un espace entre deux inserts juxtaposés. Lors du travail du galet, une usure préférentielle de l'alliage ductile compris dans l'espace est réalisée, résultant en la formation de rainures entre les inserts. Définitions US 5,238,046 has these same disadvantages. Indeed, each insert has on at least one of its longitudinal flanks protruding ribs so as to form a space between two inserts juxtaposed. When working the roller, preferential wear of the ductile alloy in the space is achieved, resulting in the formation of grooves between the inserts. Definitions
[0004] En fonderie, le module de massivité est mesuré par le rapport du volume à la surface. Il est désigné par V/S. Cette valeur, universellement utilisée par les fondeurs, est notamment prise en compte dans le calcul du masselottage des pièces coulées car, pour obtenir une pièce saine, il convient que la masselotte ait un rapport V/S supérieur à celui de la pièce à couler.  In the foundry, the massivity module is measured by the ratio of the volume to the surface. He is designated by V / S. This value, universally used by the founders, is notably taken into account in the calculation of the masselottage of the castings because, to obtain a sound part, it is appropriate that the weight has a ratio V / S higher than that of the piece to be cast.
[0005] La valeur du module V/S dépend du choix de l'unité de longueur adoptée. The value of the V / S module depends on the choice of the length unit adopted.
Le calcul peut être illustré par l'exemple simple d'un cube de côté « a ».  The calculation can be illustrated by the simple example of a side cube "a".
Dans ce cas, le V/S = a3/(6 a2) soit a/6. In this case, the V / S = a 3 / (6 to 2 ) is a / 6.
Si le V/S est exprimé en mètres pour un cube d'un mètre de côté : a/6 devient 1/6 = 0,166 m. Si le V/S est exprimé en centimètres : a/6 devient 100/6 = 16,6 cm.  If the V / S is expressed in meters for a cube of one meter of side: a / 6 becomes 1/6 = 0,166 m. If the V / S is expressed in centimeters: a / 6 becomes 100/6 = 16.6 cm.
Dans l'exposé de la présente invention, le module V/S sera toujours exprimé en centimètres.  In the disclosure of the present invention, the V / S module will always be expressed in centimeters.
Buts de l'invention Goals of the invention
[0006] Le but de la présente invention est de limiter les inconvénients de l'état de la technique en réduisant au maximum la présence de rainures formées par les interstices entre les inserts d'un galet de broyage. Pour réduire ce nombre de rainures, il faut augmenter la taille et le module de massivité de ces inserts. Avec des inserts plus massifs, la chaleur latente disponible lors de la coulée sera donc plus élevée et permettra des infiltrations plus aisées de renforts en céramique infiltrables plus épais. En corolaire, l'invention permet donc l'augmentation de l'épaisseur du renfort en céramique de l'insert. En améliorant les conditions d'infiltration du renfort par le métal de coulée, on peut utiliser des renforts plus épais qui améliorent à leur tour la résistance à l'usure de l'ensemble.  The object of the present invention is to limit the disadvantages of the state of the art by minimizing the presence of grooves formed by the interstices between the inserts of a grinding roller. To reduce this number of grooves, it is necessary to increase the size and massiveness module of these inserts. With more massive inserts, the latent heat available during casting will be higher and allow easier infiltration infiltrable ceramic reinforcements thicker. In corolar, the invention therefore allows the increase of the thickness of the ceramic reinforcement of the insert. By improving the conditions of infiltration of the reinforcement by the casting metal, one can use thicker reinforcements which in turn improve the wear resistance of the assembly.
Eléments caractéristiques de l'invention Characteristic elements of the invention
[0007] La présente invention divulgue un galet de broyage pour broyeurs à axe vertical, réalisé par coulée en fonderie, ledit galet comportant des inserts avec un module de massivité V/S compris entre 3 et 5 cm, de préférence entre 3,2 et 4,5 cm, lesdits inserts étant englobés dans une matrice métallique composée de fonte ductile ou d'acier. The present invention discloses a grinding roller for mills vertical axis, made by casting in the foundry, said roller having inserts with a massivity module V / S between 3 and 5 cm, preferably between 3.2 and 4.5 cm, said inserts being embedded in a metal matrix composed of ductile iron or steel.
[0008] Selon des modes préférés d'exécution, l'invention comporte au moins une ou une combinaison des caractéristiques suivantes :  According to preferred embodiments, the invention comprises at least one or a combination of the following features:
le galet de broyage comporte des inserts avec un module de massivité V/S compris entre 3,4 et 4 cm ; les inserts sont disposés les uns contre les autres, ne laissant que des évidements intermittents entre deux inserts et permettant, lors de la coulée, de générer un élément de liaison de type goujon améliorant la fixation de l'insert dans la matrice métallique ; the grinding roller comprises inserts with a massivity module V / S of between 3.4 and 4 cm; the inserts are arranged against each other, leaving only intermittent recesses between two inserts and allowing, during casting, to generate a dowel type connecting element improving the attachment of the insert in the metal matrix;
l'élément de liaison de type goujon comporte des contre-dépouilles ;  the stud type connecting member has undercuts;
les inserts ne sont pas disposés de manière parallèle à l'axe de rotation dudit galet, mais forment un angle inférieur à 45° avec cet axe ;  the inserts are not arranged parallel to the axis of rotation of said roller, but form an angle less than 45 ° with this axis;
les inserts ont une courbure selon leur axe longitudinal ;  the inserts have a curvature along their longitudinal axis;
les inserts ont une forme en « S » selon l'axe longitudinal ;  the inserts have an "S" shape along the longitudinal axis;
l'insert comporte un ou plusieurs renforts de céramique infiltrables par le métal de coulée ;  the insert comprises one or more ceramic reinforcements infiltrable by the casting metal;
ladite céramique du renfort est choisie parmi l'alumine, la zircone, l'alumine-zircone, les nitrures métalliques, les carbures métalliques et les borures ou des mélanges de ceux-ci.  said ceramic reinforcement is selected from alumina, zirconia, alumina-zirconia, metal nitrides, metal carbides and borides or mixtures thereof.
[0009] La présente invention divulgue également un broyeur à axe vertical comportant un galet de broyage selon l'invention.  The present invention also discloses a vertical axis mill comprising a grinding roller according to the invention.
Brève description des figures Brief description of the figures
[0010] La figure 1 représente, selon l'état de la technique, une coupe d'un broyeur vertical en fonctionnement et comportant plusieurs galets de broyage.  Figure 1 shows, according to the state of the art, a section of a vertical mill in operation and having a plurality of grinding rollers.
[0011] La figure 2a représente une vue tridimensionnelle d'un galet de broyage selon l'état de la technique avec des inserts à faible module de massivité et des espaces entre les inserts.  Figure 2a shows a three-dimensional view of a grinding roller according to the state of the art with inserts low massivity module and spaces between the inserts.
[0012] La figure 2b montre une vue tridimensionnelle d'un insert à faible module de massivité comportant des protubérances d'écartement selon l'état de la technique. Figure 2b shows a three-dimensional view of an insert with low massivity module having spacing protuberances according to the state of the art.
[0013] La figure 3 montre, à l'aide d'une vue en coupe, l'espace demeurant entre deux inserts adjacents selon l'état de la technique et la possibilité de formation de rainures de plus en plus larges entre les inserts au fur et à mesure qu'elles s'approfondissent. Figure 3 shows, with a cross-sectional view, the space remaining between two adjacent inserts according to the state of the art and the possibility of forming larger and wider grooves between the inserts at the end. as they deepen.
[0014] La figure 4 représente une vue tridimensionnelle d'un insert à faible module de massivité avec renfort céramique et comportant des écarteurs selon l'état de la technique.  FIG. 4 represents a three-dimensional view of an insert with a low massivity module with ceramic reinforcement and comprising spacers according to the state of the art.
[0015] La figure 5 montre les courbes comparatives du nombre d'inserts dans le cas d'inserts suivant l'état de la technique (V/S < 2,8 cm, carrés sur le graphique) et d'inserts suivant l'invention (V/S > 3cm, carreaux sur le graphique). Le nombre d'inserts est réduit dans les galets de broyage selon l'invention. [0016] La figure 6a montre en coupe deux inserts selon l'invention agencés côte à côte avec des protubérances d'écartement permettant de maintenir un écart minimum entre deux inserts. Selon l'invention, le nombre de rainures est limité par l'augmentation de la massivité de l'insert. Figure 5 shows the comparative curves of the number of inserts in the case of inserts according to the state of the art (V / S <2.8 cm, squares on the graph) and inserts according to the invention (V / S> 3cm, tiles on the graph). The number of inserts is reduced in the grinding rollers according to the invention. Figure 6a shows in section two inserts according to the invention arranged side by side with spacing protuberances to maintain a minimum gap between two inserts. According to the invention, the number of grooves is limited by increasing the massiveness of the insert.
[0017] La figure 6b représente une vue tridimensionnelle de l'insert représenté à la figure 6a. Figure 6b shows a three-dimensional view of the insert shown in Figure 6a.
[0018] La figure 7a montre en coupe deux inserts avec renfort en céramique selon l'invention disposés l'un contre l'autre avec un évidement intermittent.  Figure 7a shows in section two inserts with ceramic reinforcement according to the invention arranged against each other with an intermittent recess.
[0019] La figure 7b représente une vue tridimensionnelle d'un des deux inserts de la figure FIG. 7b represents a three-dimensional view of one of the two inserts of FIG.
7a où on peut visualiser l'évidement intermittent. Cet évidement permettra, lors de la coulée, de constituer un élément de liaison semblable à un goujon avec des contre-dépouilles permettant d'améliorer la fixation de l'insert dans la matrice métallique. L'insert montre également le positionnement d'un renfort céramique infiltrable par le métal de coulée augmentant la résistance à l'usure. 7a where we can visualize the intermittent recess. This recess will, during casting, to form a connection element similar to a stud with undercuts to improve the attachment of the insert in the metal matrix. The insert also shows the positioning of an infiltratable ceramic reinforcement by the casting metal increasing the wear resistance.
[0020] Les figures 8a et 8b illustrent le même mode d'exécution de l'invention que celui des figures 7a et 7b avec cependant un insert courbé dans le sens de son axe longitudinal en forme de « S ». Cette variante en forme de « S » permet à la rainure entre les inserts de ne pas rencontrer, lors du broyage, la matière à broyer de manière frontale et selon un angle inférieur à 90 °.  Figures 8a and 8b illustrate the same embodiment of the invention as that of Figures 7a and 7b with however an insert bent in the direction of its longitudinal axis in the form of "S". This variant shaped "S" allows the groove between the inserts not to meet, during grinding, the material to be crushed frontally and at an angle less than 90 °.
[0021] La figure 9 représente le même galet que celui de la figure 2a mais avec des inserts à module de massivité plus élevé selon l'invention.  FIG. 9 represents the same roller as that of FIG. 2a but with inserts with a higher mass modulus according to the invention.
[0022] La figure 10a montre un insert selon l'état de la technique tel qu'utilisé dans un galet pour broyeur Loesche® LM46/4 et dont les résultats d'essais comparatifs sont représentés dans le tableau 1. La figure 10b représente une coupe selon B-B. FIG. 10a shows an insert according to the state of the art as used in a Loesche ® LM46 / 4 grinding roller and whose comparative test results are shown in Table 1. FIG. cut according to BB.
[0023] Les figures lia et 12a montrent des inserts selon l'invention tels qu'utilisés dans un galet pour broyeur Loesche® LM46/4 et dont les résultats d'essais sont également représentés dans le tableau 1. Les figures 11b et 12b représentent respectivement des coupes selon B-B. Figures 11a and 12a show inserts according to the invention as used in a roller Loesche ® LM46 / 4 grinder and whose test results are also shown in Table 1. Figures 11b and 12b represent respectively cuts according to BB.
[0024] La figure 13a montre une vue tridimensionnelle d'un insert selon un des modes d'exécution préférés de la présente invention. A la figure 13b, deux de ces inserts sont disposés l'un contre l'autre en ne laissant qu'un évidement intermittent à diamètre variable selon une direction radiale sur le galet de broyage. L'évidement permettra la formation, lors de la coulée, d'un élément de liaison de type goujon avec des contre-dépouilles. Ici, l'insert comporte également un renfort en céramique infiltrable par le métal de coulée. [0025] La figure 14 représente une vue tridimensionnelle d'une variante d'un insert utilisable dans le galet selon l'invention où l'évidement est situé sur la face latérale dans le sens axial de l'insert. Cet évidement permettra, lors de la coulée, de générer un élément de liaison dans le sens axial du galet de broyage. Un renfort en céramique infiltrable par le métal de coulée est également présent dans ce mode d'exécution. Figure 13a shows a three-dimensional view of an insert according to one of the preferred embodiments of the present invention. In Figure 13b, two of these inserts are arranged against each other leaving only an intermittent recess variable diameter in a radial direction on the grinding roller. The recess will allow the formation, during casting, of a stud type connecting element with undercuts. Here, the insert also comprises a ceramic reinforcement infiltrable by the casting metal. Figure 14 shows a three-dimensional view of a variant of an insert used in the roller according to the invention wherein the recess is located on the side face in the axial direction of the insert. This recess will, during casting, generate a connecting element in the axial direction of the grinding roller. An infiltratable ceramic reinforcement by the casting metal is also present in this embodiment.
[0026] Les figures 15 et 16 représentent un mode d'exécution de l'invention dans lequel les inserts ne sont pas positionnés de manière parallèle à l'axe de rotation du galet de broyage, mais forment un angle inférieur à 45 ° avec cet axe. Ce type de disposition présente l'avantage que la rainure entre les inserts se présente de biais lors du broyage du matériau à broyer ce qui a pour effet une moindre détérioration de la surface du galet de broyage et donc une plus longue durée de vie de celui-ci.  Figures 15 and 16 show an embodiment of the invention in which the inserts are not positioned parallel to the axis of rotation of the grinding roller, but form an angle less than 45 ° with this axis. This type of arrangement has the advantage that the groove between the inserts is biased during the grinding of the material to be grinded which has the effect of less deterioration of the surface of the grinding roller and therefore a longer life of the -this.
[0027] Légende [0027] Legend
1. Galet de broyage.  1. Grinding roller.
2. Insert constitué d'un élément composite ou métallique très résistant à l'usure, placé à la périphérie du galet de broyage. 2. An insert consisting of a highly wear-resistant composite or metal element placed on the periphery of the grinding roller.
3. Evidements laissés entre les inserts permettant de générer un élément de liaison créé par le métal de coulée. L'élément de liaison comportera une sorte de « goujon » pouvant comporter des contre-dépouilles. 3. Recesses left between the inserts for generating a connecting element created by the casting metal. The connecting element will have a kind of "stud" which may include undercuts.
4. Matrice métallique formée par le métal de coulée composé de fonte ou d'acier et constituant la structure du galet. 4. Metal matrix formed by the casting metal composed of cast iron or steel and constituting the structure of the roller.
5. Renfort en céramique ou agglomérat de grains de céramique situé dans l'insert, aussi appelé « cake », « padding» ou « wafer » en anglais.  5. ceramic reinforcement or agglomerate ceramic grains located in the insert, also called "cake", "padding" or "wafer" in English.
6. Broyeur à axe vertical qui comporte le galet de broyage ; il s'agit de la roue qui écrase la matière sur la table du broyeur.  6. Vertical axis mill comprising the grinding roller; it is the wheel that crushes the material on the crusher table.
Description détaillée de l'invention Detailed description of the invention
[0028] Les rainures entre les inserts 2 d'un galet de broyage 1 constituent un lieu d'usure préférentielle qui non seulement nuit à la durée de vie du galet de broyage 1, mais encore à l'efficacité du broyage et à la qualité du produit broyé. Ces rainures peuvent également être source de vibrations indésirables lors du fonctionnement du broyeur 6. L'usure est encore accentuée dans le cas d'inserts renforcés par des céramiques infiltrables 5 car en se créant, la rainure déforce les bords de l'insert 2 dont le renfort éventuel en céramique 5 a dès lors tendance à s'effriter et à s'user plus rapidement. The grooves between the inserts 2 of a grinding roller 1 constitute a preferential wear area which not only adversely affects the life of the grinding roller 1, but also the grinding efficiency and the quality crushed product. These grooves can also be a source of unwanted vibrations during the operation of the mill 6. The wear is further accentuated in the case of inserts reinforced by infiltrable ceramics 5 because, by being created, the groove deforce the edges of the insert 2, the optional ceramic reinforcement 5 therefore has a tendency to crumble and wear more quickly.
[0029] Plus l'insert 2 est épais, meilleure sera la résistance à l'usure en service et plus son renfort éventuel en céramique infiltrable 5 pourra être épais. Un renfort en céramique 5 épais sera néanmoins moins facile à infiltrer par le métal liquide lors de la coulée.  The thicker the insert 2, the better the wear resistance in service and the more its possible infiltrable ceramic reinforcement 5 may be thick. A thick ceramic reinforcement will nevertheless be less easy to infiltrate by the liquid metal during casting.
[0030] La profondeur d'infiltration dépend de la chaleur latente disponible et donc de la quantité de métal liquide disponible pour réaliser l'infiltration. Dans les inserts de l'état de la technique à faible module de massivité, la quantité de métal disponible pour un volume d'insert donné est insuffisante pour infiltrer correctement un renfort de céramique au-delà d'une épaisseur d'environ 50 mm.  The depth of infiltration depends on the latent heat available and therefore the amount of liquid metal available to achieve the infiltration. In the inserts of the state of the art with a low massivity module, the quantity of metal available for a given insert volume is insufficient to correctly infiltrate a ceramic reinforcement beyond a thickness of about 50 mm.
[0031] Le renfort de céramique infiltrable 5 est parfois appelé galette ou encore The infiltrable ceramic reinforcement 5 is sometimes called slab or even
« padding », « cake » ou « wafer » en anglais et est généralement constitué d'un agglomérat de grains de céramique laissant des interstices pour laisser pénétrer le métal de coulée. Il est bien connu de l'homme de métier. En termes de composition, il s'agit généralement, sans prétention à l'exhaustivité, d'oxydes comme l'alumine, la zircone, l'alumine-zircone, la silice ou encore de nitrures métalliques, de carbures métalliques comme le carbure de titane ou le carbure de tungstène, de borures ou de mélanges de ces divers constituants. "Padding", "cake" or "wafer" in English and generally consists of an agglomerate of ceramic grains leaving gaps to let penetrate the casting metal. He is well known to the skilled person. In terms of composition, it is generally, without pretention to exhaustivity, oxides such as alumina, zirconia, alumina-zirconia, silica or metal nitrides, metal carbides such as carbide titanium or tungsten carbide, borides or mixtures of these various constituents.
[0032] Le module de massivité de l'insert est donc directement lié à la capacité d'infiltration du renforcement en céramique infiltrable 5 de l'insert 2 par le métal de coulée 4. Plus la surface totale de l'insert est grande par rapport au volume de l'insert, plus le métal de coulée a tendance à se refroidir au contact de cette surface. Donc, plus le rapport volume/surface est élevé, plus le métal reste chaud et plus l'infiltration du renfort de céramique 5 sera aisée.  The massivity module of the insert is therefore directly related to the infiltration capacity of infiltrable ceramic reinforcement 5 of the insert 2 by the casting metal 4. The greater the total surface of the insert is large by relative to the volume of the insert, the more the casting metal tends to cool in contact with this surface. Therefore, the higher the volume / surface ratio, the more the metal remains hot and the infiltration of the ceramic reinforcement 5 will be easy.
[0033] Dans la conception d'un galet de broyage 1 pour broyeur vertical 6 réalisé par coulée en fonderie selon l'état de la technique, le nombre d'inserts placés sur le pourtour du galet de broyage 1 est généralement déterminé de manière empirique par la dimension de l'insert afin d'obtenir une résistance mécanique suffisante du galet en service (voir Fig. 5). In the design of a grinding roller 1 for vertical mill 6 made by casting in the foundry according to the state of the art, the number of inserts placed on the periphery of the grinding roller 1 is generally determined empirically. by the dimension of the insert in order to obtain sufficient mechanical strength of the roller in use (see Fig. 5).
[0034] Dans l'insert selon l'état de la technique, l'épaisseur du renfort en céramique 5 est fixée à une valeur inférieure à environ 50 mm pour garantir une bonne infiltration lors de la coulée. Les longueurs de l'insert 2 et du renfort céramique 5 sont approximativement égales à la largeur du galet de broyage 1. La largeur du renfort céramique 5 correspond généralement environ à la largeur de l'insert (voir Fig. 4). [0035] Suivant ces exigences, le nombre d'inserts en fonction du diamètre extérieur du galet est donné par la courbe supérieure de la figure 5. Dans cette conception, les inserts placés dans les galets de broyage ont un rapport V/S compris entre 1 et 2,8 cm (voir Fig. 2a). In the insert according to the state of the art, the thickness of the ceramic reinforcement 5 is set at a value less than about 50 mm to ensure good infiltration during casting. The lengths of the insert 2 and the ceramic backing 5 are approximately equal to the width of the grinding roll 1. The width of the ceramic backing 5 is generally about the width of the insert (see Fig. 4). According to these requirements, the number of inserts as a function of the outer diameter of the roller is given by the upper curve of Figure 5. In this design, the inserts placed in the grinding rollers have a ratio V / S between 1 and 2.8 cm (see Fig. 2a).
[0036] Pour rencontrer les objectifs de la présente invention, le rapport V/S des inserts doit être compris entre 3 et 5 cm, de préférence entre 3,2 et 4,5 cm et de manière particulièrement préférée entre 3,4 et 4 cm. To meet the objectives of the present invention, the V / S ratio of the inserts must be between 3 and 5 cm, preferably between 3.2 and 4.5 cm and particularly preferably between 3.4 and 4. cm.
[0037] Différents modes d'exécution sont possibles dans le cadre de cette invention. Les figures montrent une série de modes d'exécution de l'invention pour un galet de même diamètre et où les dimensions de l'insert correspondent à un module de massivité V/S entre 3 et 5 cm.  Different embodiments are possible within the scope of this invention. The figures show a series of embodiments of the invention for a roller of the same diameter and where the dimensions of the insert correspond to a V / S massivity module between 3 and 5 cm.
[0038] La figure 13a montre un insert 2 conçu selon un mode préféré de l'invention. Il présente, sur les faces latérales, des évidements cylindriques 3 où alternent des parties concaves et des parties convexes. Lors de la coulée du métal constituant la structure du galet 1, les évidements 3 se remplissent de métal et les alternances de forme de l'évidement 3 permettent de générer des éléments de liaison de type goujon avec des contre-dépouilles autorisant une fixation performante des inserts 2 dans leur matrice métallique 4. Ils solidarisent les inserts 2 avec la structure du galet 1. Figure 13a shows an insert 2 designed according to a preferred embodiment of the invention. It has, on the lateral faces, cylindrical recesses 3 which alternate concave parts and convex parts. During the casting of the metal constituting the structure of the roller 1, the recesses 3 are filled with metal and the alternation of shape of the recess 3 can generate stud-type connecting elements with undercuts allowing a high performance fixing of inserts 2 in their metal matrix 4. They solidarisent the inserts 2 with the structure of the roller 1.
[0039] L'insert 2 comporte généralement une excroissance de faible épaisseur sur la face inférieure, éliminant ainsi le risque de glissement dans le sens radial du galet 1. Cette excroissance de faible épaisseur peut se présenter notamment sous la forme d'une queue d'aronde assurant l'ancrage, comme illustré notamment à la figure 11b. The insert 2 generally comprises a small thickness protrusion on the lower face, thus eliminating the risk of sliding in the radial direction of the roller 1. This small thickness protrusion may be in particular in the form of a tail of dovetail anchoring, as illustrated in particular in Figure 11b.
[0040] Les figures 11 et 12 représentent des solutions qui se différencient par l'épaisseur du renfort de céramique 5 envisagée, compte tenu de l'importance des sollicitations rencontrées en service.  Figures 11 and 12 show solutions that differ in the thickness of the ceramic reinforcement 5 considered, given the importance of the solicitations encountered in service.
[0041] Le mode d'exécution de l'invention selon les figures 13a et 13b est employé lorsqu'il est nécessaire d'augmenter l'épaisseur du renfort de céramique 5 dans l'insert 2 au-delà de 50 mm pour obtenir une résistance accrue à l'usure, mais il permet aussi de profiter de tous les avantages mentionnés plus haut. Il est particulièrement indiqué pour les galets de grand diamètre.  The embodiment of the invention according to Figures 13a and 13b is used when it is necessary to increase the thickness of the ceramic reinforcement 5 in the insert 2 beyond 50 mm to obtain a increased resistance to wear, but it also allows you to take advantage of all the advantages mentioned above. It is particularly suitable for large diameter rollers.
[0042] Certaines formes ondulées des inserts, en forme de « S », par exemple, illustrées aux figures 8a et 8b, créent des rainures de même forme entre les inserts au cours de l'usure et permettent d'adoucir le choc engendré par cette rainure grâce à la progressivité de la rencontre de celle-ci avec le lit de matière à broyer. Ceci diminue le risque de vibrations. Les exemples de formes données dans la présente description ne sont pas limitatifs ; d'autres formes géométriques peuvent bien entendu être imaginées et font partie de la présente invention. Exemples Some corrugated shapes of the inserts, shaped "S", for example, illustrated in Figures 8a and 8b, create grooves of the same shape between the inserts during wear and can soften the shock generated by this groove thanks to the progressiveness of the meeting thereof with the bed of material to grind. This reduces the risk of vibrations. The examples of shapes given in the present description are not limiting; other geometric shapes can of course be imagined and are part of the present invention. Examples
[0043] Trois galets de broyage comportant trois types d'inserts différents ont été expérimentés sur un broyeur Loesche LM46/4. Les trois types d'inserts 2 sont représentés aux figures 10, 11 et 12. Les inserts sont coulés dans une fonte de type 3% en poids de carbone et 16% en poids de chrome (U19) pour ensuite être intégrés (englobés) dans un galet de broyage dont la matrice métallique est constituée d'une fonte à graphite sphéroïdal de type GGG40. Le matériau broyé est un cru de cimenterie. Les inserts 2 comportent des renforts céramiques infiltrables 5 de type alumine-zircone. Le diamètre des galets est de 2000 mm dans les 3 cas. Le nombre d'heures de service représente la durée de vie des galets.  Three grinding rollers with three different types of inserts were tested on a Loesche mill LM46 / 4. The three types of inserts 2 are shown in FIGS. 10, 11 and 12. The inserts are cast in a type of cast iron of 3% by weight of carbon and 16% by weight of chromium (U19) and then integrated (embedded) in a grinding roller whose metal matrix consists of a spheroidal graphite cast iron type GGG40. The crushed material is a cement raw material. The inserts 2 comprise infiltratable ceramic reinforcements 5 of the alumina-zirconia type. The diameter of the rollers is 2000 mm in the 3 cases. The number of hours of service represents the service life of the rollers.
Les résultats des tests sont repris dans le tableau 1 ci-dessous.  The results of the tests are shown in Table 1 below.
Tableau 1  Table 1
EXEMPLES Nombre V/S Dimensions Nombre heures Production Amélioration INSERTS inserts Inserts renfort service tonnes %  EXAMPLES Number V / S Dimensions Number hours Production Improvement INSERTS inserts Inserts reinforcement service tons%
(cm) céramique (mm)  (cm) ceramic (mm)
Inserts inserts
comparatifs selon Comparative
l'art antérieur 73 2,6 560x75x48 10.000 3.050.000 référence Fig.lOa et b the prior art 73 2,6 560x75x48 10,000 3,050,000 reference Fig.lOa and b
Inserts selon Inserts according to
l'invention the invention
Fig.lla et b 47 3,3 560x130x60 12.000 3.700.000 + 20% Fig.lla and b 47 3,3 560x130x60 12,000 3,700,000 + 20%
Inserts selon Inserts according to
l'invention the invention
Fig.l2a et b 47 3,5 560x130x90 15.000 4.575.000 + 50% Fig.l2a and b 47 3,5 560x130x90 15,000 4,575,000 + 50%

Claims

REVENDICATIONS
1. Galet de broyage (1) pour broyeurs à axe vertical (6), réalisé par coulée en fonderie, ledit galet comportant des inserts (2) englobés dans une matrice métallique (4) composée de fonte ductile ou d'acier, caractérisé en ce que lesdits inserts (2) ont un module de massivité V/S compris entre 3 et 5 cm, de préférence entre 3,2 et 4,5 cm.  1. Grinding roller (1) for mills with vertical axis (6), produced by casting in a casting, said roller comprising inserts (2) embedded in a metal matrix (4) made of ductile iron or steel, characterized in said inserts (2) have a V / S massivity module of between 3 and 5 cm, preferably between 3.2 and 4.5 cm.
2. Galet de broyage (1) selon la revendication 1 comportant des inserts (2) avec un module de massivité V/S compris entre 3,4 et 4 cm.  2. Grinding roller (1) according to claim 1 comprising inserts (2) with a massivity module V / S between 3.4 and 4 cm.
3. Galet de broyage (1) selon la revendication 1 ou 2 dans lequel lesdits inserts (2) sont disposés les uns contre les autres, ne laissant que des évidements (3) intermittents entre deux inserts (2) et permettant, lors de la coulée, de générer un élément de liaison de type goujon améliorant la fixation de l'insert (2) dans la matrice métallique (4).  3. grinding roller (1) according to claim 1 or 2 wherein said inserts (2) are arranged against each other, leaving only recesses (3) intermittent between two inserts (2) and allowing, during the casting, generating a stud-type connecting member improving the attachment of the insert (2) in the metal matrix (4).
4. Galet de broyage (1) selon l'une quelconque des revendications précédentes dans lequel l'élément de liaison de type goujon comporte des contre-dépouilles.  4. Grinding roller (1) according to any one of the preceding claims wherein the stud type connecting member comprises undercuts.
5. Galet de broyage (1) selon l'une quelconque des revendications précédentes dans lequel les inserts (2) ne sont pas disposés de manière parallèle à l'axe de rotation desdits galets (1), mais forment un angle inférieur à 45° avec cet axe.  5. Grinding roller (1) according to any one of the preceding claims wherein the inserts (2) are not arranged parallel to the axis of rotation of said rollers (1), but form an angle less than 45 ° with this axis.
6. Galet de broyage (1) selon l'une quelconque des revendications précédentes dans lequel les inserts (2) ont une courbure selon leur axe longitudinal.  6. Grinding roller (1) according to any one of the preceding claims wherein the inserts (2) have a curvature along their longitudinal axis.
7. Galet de broyage (1) selon la revendication 6 dans lequel les inserts ont une forme en « S » selon leur axe longitudinal.  7. Grinding roller (1) according to claim 6 wherein the inserts have an "S" shape along their longitudinal axis.
8. Galet de broyage (1) selon l'une quelconque des revendications précédentes dans lequel l'insert (2) comporte un ou plusieurs renforts de céramique (5) infiltrables par le métal de coulée.  8. Grinding roller (1) according to any one of the preceding claims wherein the insert (2) comprises one or more ceramic reinforcements (5) infiltratable by the casting metal.
9. Galet de broyage (1) selon la revendication 8 dans lequel ladite céramique du renfort (5) est choisie parmi l'alumine, la zircone, l'alumine-zircone, les nitrures métalliques, les carbures métalliques et les borures ou des mélanges de ceux-ci.  9. milling roller (1) according to claim 8 wherein said ceramic reinforcement (5) is selected from alumina, zirconia, alumina-zirconia, metal nitrides, metal carbides and borides or mixtures of these.
10. Broyeur à axe vertical (6) comportant un galet de broyage (1) selon l'une quelconque des revendications précédentes.  10. Vertical axis mill (6) having a grinding roller (1) according to any one of the preceding claims.
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JPS62244449A (en) * 1986-04-15 1987-10-24 三菱重工業株式会社 Crusher
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JP2863768B2 (en) * 1993-06-08 1999-03-03 アイエヌジ商事株式会社 Crushing surface member used for crusher
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DE10354679A1 (en) * 2003-11-22 2005-06-30 Khd Humboldt Wedag Ag Grinding roller for the crushing of granular material
EP1570905A1 (en) * 2004-03-03 2005-09-07 Magotteaux International S.A. Grinding roller for a roller mill
DE102009050636B4 (en) * 2009-10-24 2011-07-07 Siempelkamp Giesserei GmbH, 47803 Grinding roller and ring bandage for a grinding roller
JP2012035157A (en) * 2010-08-04 2012-02-23 Ube Techno Enji Kk Crushing roller

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ES2680675T3 (en) 2018-09-10
CL2016002594A1 (en) 2017-02-24
US20170043349A1 (en) 2017-02-16
RU2673191C2 (en) 2018-11-22
KR20160145594A (en) 2016-12-20
RU2016142139A (en) 2018-05-23
JP2017513695A (en) 2017-06-01
CA2945061A1 (en) 2015-10-29
DK3134212T3 (en) 2018-09-10
PL3134212T3 (en) 2019-02-28
AU2015250957B2 (en) 2018-12-13
MX2016013902A (en) 2017-01-11
ZA201606497B (en) 2018-05-30
BE1021839B1 (en) 2016-01-21
RU2016142139A3 (en) 2018-08-02
CN106413900B (en) 2018-09-28
EP3134212B1 (en) 2018-06-06
BR112016022484A2 (en) 2017-08-15
WO2015162047A1 (en) 2015-10-29
AU2015250957A1 (en) 2016-10-06
CN106413900A (en) 2017-02-15
PT3134212T (en) 2018-07-30

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