EP0476496B1 - Verfahren zur Herstellung eines bimetallischen Gussstückes und Verschleissteil nach diesem Verfahren - Google Patents

Verfahren zur Herstellung eines bimetallischen Gussstückes und Verschleissteil nach diesem Verfahren Download PDF

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Publication number
EP0476496B1
EP0476496B1 EP91115332A EP91115332A EP0476496B1 EP 0476496 B1 EP0476496 B1 EP 0476496B1 EP 91115332 A EP91115332 A EP 91115332A EP 91115332 A EP91115332 A EP 91115332A EP 0476496 B1 EP0476496 B1 EP 0476496B1
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EP
European Patent Office
Prior art keywords
inserts
casting
insert
roller
mould
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91115332A
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English (en)
French (fr)
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EP0476496A1 (de
Inventor
Norbert Guerard
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
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Magotteaux International SA
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • 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
    • 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
    • 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
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/181—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools using cutters loosely mounted on a turning tool support
    • 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 a process for manufacturing a bimetallic foundry part as well as to a wear part produced by this process, in particular shredder frets.
  • the part exposed to abrasion consists of chromium cast iron with high abrasion resistance supported by a more ductile steel core. This reduces wear on the part, while allowing machining of the core and avoiding breakage. In addition, it is possible to reduce its manufacturing cost by a judicious choice of its components.
  • patent LU-64303 proposes a process for manufacturing composite parts by successive castings of materials with different or complementary properties.
  • this technique has two constraints. First, the process necessarily implies the existence of a horizontal separation surface between the two cast metals. In addition, the room must be relatively massive to allow the two metals to flow successively while obtaining a correct metallurgical bond between them.
  • Brazing at high temperature offers mechanical properties comparable to welding, but it requires careful operating precautions and the use of special ovens, especially vacuum ovens, in order to obtain a reliable assembly. This results in a relatively high manufacturing cost.
  • Patent US-4,099,988 proposes the implementation of the technique of inserts for the production of bimetallic armor plates for blast furnaces.
  • inserts are first poured into first molds, these inserts are then placed in a second mold in which the part is cast around the inserts so as to form a metallurgical bond between the inserts and the support material.
  • This process has the disadvantage that the inserts undergo thermal shocks during the casting of the parts. These thermal shocks generate internal tensions and cracks which propagate, not only through the inserts but, because of the metallurgical bond, also through the support.
  • the aim of the present invention is to provide a new method for manufacturing a bimetallic foundry part with a high insertion rate, the properties of which result not only from the properties specific to each component, but also from a useful synergistic effect generated. by the juxtaposition of the two components and due either to the morphology, or to the dimensioning, or to the choice of the materials of the components.
  • the present invention provides a method of manufacturing a bimetallic foundry part according to claim 1.
  • This preparation can for example consist, when the massiveness of the inserts is not too high, in a simple heat treatment.
  • the massivity increases, it is possible to provide the inserts with a refractory coating forming a thermal barrier.
  • the massivity is very high, one can even consider providing the inserts with a ceramic coating.
  • the process allows, by a judicious choice of the nature and morphology of the two components, to generate, in service, a wear profile which will maintain or optimize the work of the part.
  • Each insert may comprise a part of substantially parallelepiped shape constituting a wear part extended radially towards the center of the hoop by a longitudinal constriction with a section in the form of a "dovetail” forming the zone of mechanical connection with ductile iron. .
  • the "dovetail” section can also be replaced by fluted sections.
  • the spacing between the adjacent inserts can be determined by projecting radial ribs provided on the longitudinal sides of the inserts.
  • the inserts extend from one of the bases of the hoop and end before the opposite base to define there a peripheral ring of ductile iron.
  • the grinding rollers are, in general, constituted by a frustoconical or cylindrical annular hoop, mounted on a hub. On the one hand, they must have sufficient resistance to wear caused by grinding and, at the same time, be able to be machined to be mounted on the hub.
  • the known hoops are generally cast in Ni-hard cast iron or in chrome cast iron and then machined with great precision (internal diameter with H6 tolerance in certain cases) before being mounted on their hub.
  • the profile of the working surfaces changes and the backlash adjustment system no longer makes it possible to restore optimal grinding conditions.
  • the sliding between the material to be ground and the surface of the hoop accelerates wear and reduces the flow rate, especially if the material to be ground is wet.
  • the present invention proposes, in its application to the crusher, to produce the hoops with inserts as shown in FIG. 3.
  • a hoop therefore consists of an annular support 42 of ductile and machinable cast iron, in which peripheral inserts 44 are embedded in a material with high abrasion resistance, for example in chromium cast iron and forming the working and wearing surface of the hoop.
  • the inserts 44 are first cast separately in suitable molds. These inserts 44 advantageously have the shape shown in perspective in Figure 4. They consist of an outer part 46 of substantially parallelepiped shape with slightly frustoconical section along the radius of curvature of the hoop. This part is extended towards the base, or inside the hoop, by a strangled longitudinal foot 48 with a radial section in the form of a "dovetail" and forming the connection zone with the support 42. Each insert 44 comprises on at least one of its longitudinal sides of the part 46, in the embodiment shown, two projecting ribs 50.
  • the inserts 44 are then placed in the mold for the casting of the frets so as to fill the entire periphery of the mold.
  • the inserts 44 are juxtaposed so that their ribs 50 are in mutual contact to define between two juxtaposed inserts a space 52 more or less wide depending on the size of the ribs 50.
  • the purpose of these ribs 50 is to cause, during casting of support 42, a spreading of the ductile iron in the spaces 52 to form between all of the neighboring inserts 44 a thin radial fin made of ductile iron.
  • the hoop is cast in such a way as to avoid a metallurgical connection between the support 42 and the inserts 44.
  • the inserts 44 can undergo a prior preparation, for example a heat treatment to reduce the risk of cracking. If the massiveness of the inserts 44 is relatively large compared to the support 42 it is inter alia possible to coat the inserts 44 before the casting of the hoop, with a refractory coating intended to form a thermal barrier.
  • the temperature of the material forming the support 42 must therefore no longer be as high, during the casting of the hoop, compared to the case of a casting with the formation of a metallurgical bond. This has the advantage of reducing the thermal shocks that the inserts 44 undergo during this casting. These are therefore less exposed to the risks of crack formation. If, despite this precaution, a crack should form in an insert 44, this crack would only propagate through the insert since the absence of metallurgical bond prevents its progression through the material of the support 42. In other words , the method proposed by the invention reduces the risk of cracks occurring in the inserts 44 and also prevents their progression in the support.
  • the purpose of the fins 52 is to cause, by the work of the roller, preferential wear of the ductile alloy and the formation of grooves between the inserts 44 for the purpose of gripping the material to be ground. In order to have the optimum yield, it is therefore necessary to choose the spacing between the inserts 44 as a function of the friction characteristics of the material used, of its particle size and of its angularity.
  • the morphology and the shape of the inserts 44 is therefore dictated by several criteria. Their width and spacing must allow a circumferential pitch providing optimal training of the material used.
  • the profile of the part 48 of each insert 44 allows an excellent mechanical connection between the inserts 44 and the support 42 with a minimum of tension concentration in the chromium cast iron of the inserts.
  • the radial height of the inserts 44 allows a large usable thickness and a good mechanical connection until the end of the service life.
  • the ribs 50 allow easy adjustment and positioning of the inserts 44 in the mold.
  • a hoop produced with inserts as described above has several advantages over known frets.
  • the machining and hooping operation is less delicate and less costly because of the ductility of the support 42. This ductility also reduces the risk of sudden rupture over the entire section of the part following static stresses of hooping and fatigue in service. It is possible to use castings with a high chromium content, that is to say of very high hardness (greater than 65 Rc), the machining of which is extremely difficult and expensive. At the same time, the manufacturing process allows a better utilization rate of the expensive chrome cast iron.
  • the combination of these materials generates a synergistic effect offering other advantages.
  • This compression of the working surface has a positive effect on the resistance to fatigue and also, in certain cases, on abrasion resistance.
  • the hoops produced according to the proposed method offer increased wear resistance, increased mechanical reliability and increased flow during their period of use.
  • the hoop 60 has inserts 62 which do not extend over the entire length of the generator so as to leave a peripheral nose 64a forming part of the support 64 in the outer edge of the rollers.
  • ductile iron We therefore deliberately cause wear in this region of the roller faster to compensate for the fact that this region normally wears less quickly.
  • Figure 7 shows the evolution of the wear of such a hoop 60.
  • the profile identified by A represents the outer periphery of the hoop 60 in the unused new state.
  • Line B represents the evolution of the wear profile when the hoop has a uniform hardness over the entire length of the generator
  • dashed line C represents the evolution of the wear profile as corrected by a hoop according to Figure 6 with an outer edge 64a more ductile.
  • the particular shape of the inserts 44 especially their dovetail shape 48 contributes to consolidating the mechanical connection between the inserts 44 and the support 42.
  • the inserts are relatively massive, it is possible, to increase the contact surface while avoiding having to make cuts that are too deep to form the dovetail shapes, to provide inserts as shown in FIG. 8.
  • Such an insert 64 is comparable to the inserts 44 of FIG. 4, with the difference that the inner part 66 has on its two longitudinal sides corrugations or grooves 68 forming a sort of multiple dovetail.
  • the mechanical connection zone is therefore separate and is, in fact, behind the wear zone, which avoids a certain number of drawbacks at the end of life compared to the simple dovetail flush with the work surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Mining & Mineral Resources (AREA)
  • Crushing And Grinding (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Earth Drilling (AREA)
  • Adornments (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Lubricants (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (9)

  1. Verfahren zur Herstellung eines bimetallischen Gusstücks gemäss welchem Verschleisseinsätze in einer ersten Giessform aus einem Werkstoff mit hohem Verschleisswiderstand gegossen werden, die so gegossenen Einsätze in eine zweite Giessform angeordnet werden und das Werkstück in der zweiten Giessform aus einem geschmeidigeren Material das mechanischen Beanspruchungen widersteht um die Einsätze gegossen wird, dadurch gekennzeichnet, dass das Giessen in der ersten Giessform so ausgeführt wird, dass die Einsätze auf wenigstens einer ihrer Längskanten wenigstens eine radiale vorstehende Rippe oder ein ähnliches Mittel aufweisen, welches einen Abstand zum benachbarten Einsatz bewirkt, dass die Einsätze am Kreisumfang der zweiten Giessform nebeneinander so angeordnet werden, dass die nebeneinander angeordneten Einsätze durch einen Raum getrennt sind welcher von den vorstehenden Rippen oder ähnlichen Mitteln betimmt ist, dass das geschmeidigere Material in die zweite Giessform gegossen wird um die Giessform und die Räume zwischen den Einsätzen zu füllen, wobei dieser Giessvorgang so durchgeführt wird, dass eine metallurgische Verbindung zwischen den Einsätzen und dem geschmeidigeren Material vermieden wird und dass nur eine mechanische Verbindung entsteht, welche durch eine geeignete geometrische Form der Einsätze verstärkt wirkt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zur Vermeidung der Rissentstehung beim Giessen der Werkstücke die Einsätze einer thermischen Behandlung unterworfen werden, bevor sie in der zweiten Giessform angeordnet werden.
  3. Verfahren nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die Einsätze mit einem eine Wärmeschranke bildenden feuerfesten Überzug versehen werden.
  4. Bandagenring für zylindrische oder kegelstumpfförmige Mahlwalzen mit einer zentralen Bohrung zur Aufnahme einer Tragnabe welcher nach einem Verfahren gemäss einem der Ansprüche 1 bis 3 hergestellt ist, welcher eine aus geschmeidigem bearbeitbarem Guss gegossene Unterlage aufweist in welche an der Oberfläche in Längsrichtung entlang den Mantellinien Verschleisseinsätze (44) aus einem Werkstoff mit hohem Verschleisswiderstand eingebettet sind, wobei jeder Einsatz (44) auf wenigstens einer seiner Seitenflanken wenigstens eine radiale vorstehende Rippe oder ähnliches Mittel aufweist welche einen Abstand zum benachbarten Einsatz bewirkt, wobei jeder Einsatz (44) von den beiden Nachbareinsätzen durch einen radialen Flügel (52) welcher aus einer dünnen Schicht geschmeidigen Guss besteht getrennt ist, wobei die Masse der Einsätze wenigstens 30% der Masse des Bandagenrings ausmacht und mit einer mechanischen Verbindung zwischen dem oder den Einsätzen und der Unterlage, wobei die mechanische Verbindung durch eine geeignete geometrische Form des Einsatzes verstärkt ist.
  5. Bandagenring nach Anspruch 4 dadurch gekennzeichnet dass jeder Einsatz (44) einen Teil (46) etwa parallelepipedischer Form aufweist, welcher das Verschleisstück bildet und welcher radial in Richtung Zentrum des Bandagenrings durch eine längliche Einschnürung (48) mit einem schwalbenschwanzförmigen Querschnitt verlängert ist welche einen Bereich der Verbindung mit dem geschmeidigen Guss der Unterlage bildet.
  6. Bandagenring nach Anspruch 4, dadurch gekennzeichnet, dass jeder Einsatz (64) einen Teil etwa parallelepipedischer Form aufweist welcher das Verschleisstück bildet und welcher radial in Richtung Zentrum des Bandagenrings durch einen Teil (66) verlängert ist welcher auf jeder Seite Längsrillen (68) aufweist die einen Bereich mechanischer Bindung mit dem geschmeidigen Guss der Unterlage bildet.
  7. Bandagenring nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass jeder Einsatz (44, 64) auf wenigstens einer seiner Längsseiten radiale vorstehende Rippen (50) aufweist welche den Abstand mit jedem benachbarten Einsatz und die Dicke der radialen Flügel (52) bestimmen.
  8. Bandagenring nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass die Einsätze (62) sich von einer Grundfläche des Bandagenrings (60) bis vor die gegenüberliegende Grundfläche erstrecken um dort einen äusseren Kranz (64a) aus geschmeidigem Guss abzugrenzen.
  9. Bandagenring nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass die Einsätze aus Chromguss mit einer sehr hohen Härte von wenigstens 65 Rc bestehen.
EP91115332A 1990-09-20 1991-09-11 Verfahren zur Herstellung eines bimetallischen Gussstückes und Verschleissteil nach diesem Verfahren Expired - Lifetime EP0476496B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000895 1990-09-20
BE9000895A BE1004573A4 (fr) 1990-09-20 1990-09-20 Procede de fabrication d'une piece de fonderie bimetallique et piece d'usure realisee par ce procede.

Publications (2)

Publication Number Publication Date
EP0476496A1 EP0476496A1 (de) 1992-03-25
EP0476496B1 true EP0476496B1 (de) 1995-03-01

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EP91115332A Expired - Lifetime EP0476496B1 (de) 1990-09-20 1991-09-11 Verfahren zur Herstellung eines bimetallischen Gussstückes und Verschleissteil nach diesem Verfahren

Country Status (10)

Country Link
EP (1) EP0476496B1 (de)
JP (1) JP2799250B2 (de)
KR (1) KR0149031B1 (de)
AT (1) ATE119092T1 (de)
BE (1) BE1004573A4 (de)
CA (1) CA2051221C (de)
DE (1) DE69107746T2 (de)
DK (1) DK0476496T3 (de)
ES (1) ES2069156T3 (de)
PT (1) PT99013B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100425348C (zh) * 2004-03-03 2008-10-15 马格托国际股份有限公司 用于垂直粉碎机的粉碎滚轮
CN107552767A (zh) * 2017-08-24 2018-01-09 昆明理工大学 一种新型耐磨斗齿的制作工艺

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LU88246A1 (fr) * 1993-04-14 1994-12-01 Magotteaux Int Procédé de fabrication de pièces d'usure composite et pièces réalisées par ce procédé
LU88549A1 (fr) * 1994-10-24 1995-02-01 Magotteaux Int Procédé de fabrication d'un galet de broyage bimétallique et galet de broyage obtenu par la mise en oeuvre de ce procédé
DE19528512C2 (de) * 1995-08-03 2001-02-22 Swb Stahlformgusgmbh Verschleißteile und Verfahren zu deren Herstellung
AU7734796A (en) * 1995-12-26 1997-07-17 Combustion Engineering Inc. Energy-efficient grinding rolls for coal pulverizers
LU88753A1 (fr) * 1996-04-30 1996-10-04 Magotteaux Int Piste pour broyeurs
EP0838288A1 (de) * 1996-10-01 1998-04-29 Hubert Francois Verschleissfeste Verbundgussteile
PT930948E (pt) 1996-10-01 2001-01-31 Magotteaux Int Peca de desgaste composita
LU90006B1 (fr) * 1997-01-15 1997-08-21 Magotteaux Int Insert pour pièces d'usure composites procédé de fabrication d'une pièce d'usure à l'aide de tels inserts et pièce d'usure ainsi réalisée
CN1275723C (zh) 2001-12-04 2006-09-20 马格托国际股份有限公司 具有增强耐磨性的铸型部件
SE532815C2 (sv) * 2007-11-09 2010-04-13 Combi Wear Parts Ab Självskärpande, autosignalerande slitdel
BE1018129A3 (fr) 2008-09-19 2010-05-04 Magotteaux Int Impacteur composite pour concasseurs a percussion.
CN103056343B (zh) * 2012-12-21 2014-11-26 佳木斯大学 三金属复合铸造破碎机锤头生产工艺方法
BE1021839B1 (fr) * 2014-04-23 2016-01-21 Magotteaux International S.A. Galet de broyage comportant des inserts a massivite elevee
CN103977864A (zh) * 2014-06-11 2014-08-13 南京凯盛国际工程有限公司 一种新型立磨辊套
CN105413804A (zh) * 2015-12-03 2016-03-23 中钢集团安徽天源科技股份有限公司 一种高压辊磨机辊面结构及制作方法
CN111112583B (zh) * 2020-01-06 2021-09-24 南通高欣耐磨科技股份有限公司 一种低成本、可修复式陶瓷合金复合磨辊的制造方法
CN111408702A (zh) * 2020-04-07 2020-07-14 聂章银 一种方便移动的双金属铸造模具
CN111618277B (zh) * 2020-04-22 2021-09-21 南通高欣耐磨科技股份有限公司 一种易拆卸、易加工、可修复、高耐磨陶瓷合金复合磨辊的制造方法
CN111571121B (zh) * 2020-04-22 2021-09-21 南通高欣耐磨科技股份有限公司 一种易拆卸、可修复高耐磨陶瓷合金复合磨辊的制造方法
CN111590053B (zh) * 2020-04-22 2021-09-03 南通高欣耐磨科技股份有限公司 一种易加工、可修复高耐磨金属陶瓷复合磨辊的制造方法
CN113368959A (zh) * 2021-06-11 2021-09-10 郑州机械研究所有限公司 一种不伤害母体的耐磨结构及其制备方法
CN114950636B (zh) * 2022-06-06 2024-04-26 唐山迁西大方科技有限公司 铠甲钉辊套及其制备方法

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JPS63143949A (ja) * 1986-12-09 1988-06-16 アイエヌジ商事株式会社 粉砕機に使用される破砕面部材
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100425348C (zh) * 2004-03-03 2008-10-15 马格托国际股份有限公司 用于垂直粉碎机的粉碎滚轮
CN107552767A (zh) * 2017-08-24 2018-01-09 昆明理工大学 一种新型耐磨斗齿的制作工艺

Also Published As

Publication number Publication date
DE69107746T2 (de) 1995-06-29
PT99013A (pt) 1993-10-29
KR0149031B1 (ko) 1998-11-16
JP2799250B2 (ja) 1998-09-17
BE1004573A4 (fr) 1992-12-15
KR920006061A (ko) 1992-04-27
ES2069156T3 (es) 1995-05-01
CA2051221A1 (en) 1992-03-21
EP0476496A1 (de) 1992-03-25
ATE119092T1 (de) 1995-03-15
JPH04231164A (ja) 1992-08-20
DE69107746D1 (de) 1995-04-06
CA2051221C (en) 1999-03-30
PT99013B (pt) 1999-02-26
DK0476496T3 (da) 1995-07-17

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