EP0634250B1 - Cutting insert for demolishing tools - Google Patents

Cutting insert for demolishing tools Download PDF

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Publication number
EP0634250B1
EP0634250B1 EP19940810258 EP94810258A EP0634250B1 EP 0634250 B1 EP0634250 B1 EP 0634250B1 EP 19940810258 EP19940810258 EP 19940810258 EP 94810258 A EP94810258 A EP 94810258A EP 0634250 B1 EP0634250 B1 EP 0634250B1
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EP
European Patent Office
Prior art keywords
diamond grains
cutting
hard
tools
binder
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
EP19940810258
Other languages
German (de)
French (fr)
Other versions
EP0634250A2 (en
EP0634250A3 (en
Inventor
Eugen Magyari
Walter Ritt
Peter Jost
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.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP0634250A2 publication Critical patent/EP0634250A2/en
Publication of EP0634250A3 publication Critical patent/EP0634250A3/en
Application granted granted Critical
Publication of EP0634250B1 publication Critical patent/EP0634250B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • 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
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
    • 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
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/27—Cutters, for shaping comprising tool of specific chemical composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Definitions

  • the invention relates to cutting bodies for drills, cutting discs, saws and the like.
  • Material-removing Tools with binder based on metal, hard particles and as Diamond-grained cutting elements.
  • Tools For drilling, cutting and separating stone and building materials such as concrete, brick and the like.
  • Tools are used whose cutting edges are designed as separate cutting bodies and with a support in the form of a hollow cylinder, a disc, a roller and the like.
  • the cutting bodies consist of binding agents, Hard particles and diamond grains.
  • a rock drill which consists of a drill bit sintered carbide.
  • the hard metal consists of hard material particles, which are sintered together using a small amount of binder.
  • To the Diamond grains are embedded in the surface of the drill bit for the purpose of material removal.
  • the service life of the rock drill with a drill bit of the aforementioned known type is determined by the lifespan of the diamond grains. Are the diamond grains worn out due to its wear, the drilling tool is no longer able to fulfill its material-removing function. It should also be borne in mind that the drill bit made of sintered hard metal is extremely hard, but only a small one Toughened carrier for the diamond grains forms. So all Shocks occurring during drilling undamped by the diamond grains on the hard ones Transfer carrier, which leads to excessive stress, so that the Diamond grains can break before their normal wear and so before the usual Wear lead to failure of the drilling tool.
  • a hollow drill which has a hollow cylindrical support has, the end of the drilling direction open end carries cutting body.
  • the Cutting bodies of this known hollow drill consist of a binder in which Diamond grains are embedded.
  • this known hollow drill diamonds are not only on the surface, but present within the entire cutting body consisting of binder.
  • the wear of the diamond grains also removes binders. Is a diamond grain completely worn or it fails, so much binder has been removed at the same time, that another diamond grain is uncovered and fulfill the material-removing function can.
  • the service life of this known hollow drill is only after complete wear the cutting body to the end.
  • the binder forms one elastic carrier for the diamond grains that blows during the drilling process without overwork can be included and not an early break of the Lead diamond grains.
  • the hollow drill known from the last-mentioned publication has thus compared the former rock drill has certain advantages in terms of tool life. Indeed these advantages play out within a certain framework and become particularly heavily influenced by the material to be processed. Is this material? for example, around a very hard concrete, the wear of the diamond grains and especially the binder is so large that in turn very strong tool life-related Disadvantages have to be accepted.
  • the invention has for its object a cutting body for material-removing To create tools that are characterized by a long service life.
  • the hard material particles help to increase the service life through two effects.
  • One is static. Stiffen the hard material particles the binder, for example based on cobalt, and thereby support the diamond grains in their anchoring.
  • the second effect is dynamic and is that the hard material particles the active surface of the binder from the erosive reaction of the protect the surface to be worked on, especially concrete.
  • the abrasion resistance of the binder is reduced by the addition of hard material particles preferably increased by three to four times.
  • the reinforcement of the binder is depending on the amount of hard material particles, precisely controllable.
  • the hard material particles expediently have a grain size of 45 to 90 microns.
  • the hard material particles advantageously consist of tungsten carbide. Such Hard material parts are characterized by their high hardness and also act as additional To cut.
  • the cutting bodies according to the invention can have a wide variety of shapes, the shape being matched to the carrier used.
  • the carrier can be hollow cylinders, disks, rollers and the like. act. While hollow cylinders are used particularly in drilling tools, can be surface processing and cutting devices, for example discs or act as rollers. According to this use find carriers the cutting body, for example, the shape of segments, rings, disks and the like. on.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Sawing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The cutting insert, capable of being brought into association with a material-removing tool, such as drills, cutting-off wheels, saws and the like, consists of a bonding agent, diamond grains and a small proportion of hard-material particles. The hard-material particles strengthen the bonding agent and support the diamond grains in their anchoring.

Description

Die Erfindung betrifft Schneidkörper für Bohrer, Trennscheiben, Sägen und dgl. materialabtragende Werkzeuge, mit Bindemittel auf Metallbasis, Hartstoffteilchen und als Schneidelemente wirkende Diamantkörner.The invention relates to cutting bodies for drills, cutting discs, saws and the like. Material-removing Tools, with binder based on metal, hard particles and as Diamond-grained cutting elements.

Für das Bohren, Schneiden und Trennen von Gestein und Baustoffen, wie Beton, Ziegel und dgl. werden Werkzeuge benutzt, deren Schneiden als separate Schneidkörper ausgebildet und mit einem Träger in Form eines Hohlzylinders, einer Scheibe, einer Walze und dgl. verbunden sind. Die Schneidkörper bestehen dabei aus Bindemittel, Hartstoffteilchen und Diamantkörnern.For drilling, cutting and separating stone and building materials such as concrete, brick and the like. Tools are used whose cutting edges are designed as separate cutting bodies and with a support in the form of a hollow cylinder, a disc, a roller and the like. The cutting bodies consist of binding agents, Hard particles and diamond grains.

Aus der DE-PS 590 707 ist ein Gesteinsbohrer bekannt, welcher eine Bohrkrone aus gesintertem Hartmetall aufweist. Das Hartmetall besteht aus Hartstoffteilchen, welche unter Verwendung eines geringen Anteiles an Bindemittel zusammengesintert sind. Zum Zwecke des Materialabtragens sind in die Oberfläche der Bohrkrone Diamantkörner eingebettet.From DE-PS 590 707 a rock drill is known which consists of a drill bit sintered carbide. The hard metal consists of hard material particles, which are sintered together using a small amount of binder. To the Diamond grains are embedded in the surface of the drill bit for the purpose of material removal.

Die Standzeit des Gesteinsbohrers mit einer Bohrkrone der vorgenannten bekannten Art wird damit von der Lebensdauer der Diamantkörner bestimmt. Sind die Diamantkörner aufgrund ihres Verschleisses abgenutzt, ist das Bohrwerkzeug nicht mehr in der Lage seine materialabtragende Funktion zu erfüllen. Ausserdem ist zu berücksichtigen, dass die Bohrkrone aus gesintertem Hartmetall einen äusserst harten, aber eine nur geringe Zähigkeit aufweisenden Träger für die Diamantkörner bildet. Damit werden sämtliche, beim Bohren auftretenden Schläge ungedämpft von den Diamantkörnern auf den harten Träger übertragen, was sehr schnell zu Ueberbeanspruchungen führt, so dass die Diamantkörner vor ihrer normalen Abnutzung zu Bruch gehen können und so vor der üblichen Abnutzung zu einem Ausfall des Bohrwerkzeuges führen.The service life of the rock drill with a drill bit of the aforementioned known type is determined by the lifespan of the diamond grains. Are the diamond grains worn out due to its wear, the drilling tool is no longer able to fulfill its material-removing function. It should also be borne in mind that the drill bit made of sintered hard metal is extremely hard, but only a small one Toughened carrier for the diamond grains forms. So all Shocks occurring during drilling undamped by the diamond grains on the hard ones Transfer carrier, which leads to excessive stress, so that the Diamond grains can break before their normal wear and so before the usual Wear lead to failure of the drilling tool.

Aus der DE-OS 34 08 092 ist ein Hohlbohrer bekannt, der einen hohlzylindrischen Träger aufweist, dessen bohrrichtungsseitig offenes Ende Schneidkörper trägt. Die Schneidkörper dieses bekannten Hohlbohrers bestehen aus einem Bindemittel, in welchem Diamantkörner eingebettet sind.From DE-OS 34 08 092 a hollow drill is known which has a hollow cylindrical support has, the end of the drilling direction open end carries cutting body. The Cutting bodies of this known hollow drill consist of a binder in which Diamond grains are embedded.

Bei diesem bekannten Hohlbohrer sind damit Diamanten nicht nur an der Oberfläche, sondern innerhalb der gesamten aus Bindemittel bestehenden Schneidkörper vorhanden. Beim materialabtragenden Einsatz dieses bekannten Hohlbohrers wird damit nebst der Abnutzung der Diamantkörner auch Bindemittel abgetragen. Ist ein Diamantkorn völlig abgenutzt oder es fällt aus, ist gleichzeitig so viel Bindemittel abgetragen worden, dass ein weiteres Diamantkorn freigelegt ist und die materialabtragende Funktion erfüllen kann. Die Standzeit ist bei diesem bekannten Hohlbohrer damit erst nach völliger Abnutzung der Schneidkörper zu Ende. Ueberdies bildet das Bindemittel einen derart elastischen Träger für die Diamantkörner, dass Schläge beim Bohrvorgang ohne Ueberbeanspruchung aufgenommen werden können und nicht zu einem vorzeitigen Bruch der Diamantkörner führen.In this known hollow drill, diamonds are not only on the surface, but present within the entire cutting body consisting of binder. When using this well-known hollow drill in addition to material the wear of the diamond grains also removes binders. Is a diamond grain completely worn or it fails, so much binder has been removed at the same time, that another diamond grain is uncovered and fulfill the material-removing function can. The service life of this known hollow drill is only after complete wear the cutting body to the end. Furthermore, the binder forms one elastic carrier for the diamond grains that blows during the drilling process without overwork can be included and not an early break of the Lead diamond grains.

Der aus der letztgenannten Veröffentlichung bekannte Hohlbohrer hat damit gegenüber dem erstgenannten Gesteinsbohrer hinsichtlich Standzeit gewisse Vorteile. Allerdings spielen sich diese Vorteile in einem bestimmten Rahmen ab und werden insbesondere von dem zu bearbeitenden Material stark beeinflusst. Handelt es sich bei diesem Material beispielsweise um einen sehr harten Beton, ist die Abnutzung der Diamantkörner und insbesondere des Bindemittels so gross, dass wiederum sehr starke standzeitbedingte Nachteile in Kauf genommen werden müssen.The hollow drill known from the last-mentioned publication has thus compared the former rock drill has certain advantages in terms of tool life. Indeed these advantages play out within a certain framework and become particularly heavily influenced by the material to be processed. Is this material? for example, around a very hard concrete, the wear of the diamond grains and especially the binder is so large that in turn very strong tool life-related Disadvantages have to be accepted.

Der Erfindung liegt die Aufgabe zugrunde, einen Schneidkörper für materialabtragende Werkzeuge zu schaffen, der sich durch eine hohe Standzeit auszeichnet.The invention has for its object a cutting body for material-removing To create tools that are characterized by a long service life.

Erfindungsgemäss wird dies dadurch erreicht, dass der Schneidkörper 6 bis 15 Vol.-% Diamantkörner, 1 bis 3 Vol.-% Hartstoffteilchen und 82 - 93 Vol.-% Bindemittel bezogen auf das Gesamtvolumen des Schneidkörpers aufweist.This is achieved according to the invention in that the cutting body 6 to 15% by volume Diamond grains, 1 to 3 vol .-% hard particles and 82 - 93 vol .-% binder on the total volume of the cutting body.

Abbauphysikalisch gesehen tragen die Hartstoffteilchen zur Erhöhung der Standzeit durch zwei Wirkungen bei. Die eine ist statischer Natur. Die Hartstoffteilchen versteifen das Bindemittel beispielsweise auf Kobaltbasis und stützen dadurch die Diamantkörner in ihrer Verankerung. Die zweite Wirkung ist dynamischer Natur und besteht darin, dass die Hartstoffteilchen die Wirkfläche des Bindemittels von der erosiven Rückwirkung des zu bearbeitenden Untergrundes, insbesondere Beton schützen.In terms of degradation physics, the hard material particles help to increase the service life through two effects. One is static. Stiffen the hard material particles the binder, for example based on cobalt, and thereby support the diamond grains in their anchoring. The second effect is dynamic and is that the hard material particles the active surface of the binder from the erosive reaction of the protect the surface to be worked on, especially concrete.

Durch die Zugabe von Hartstoffteilchen wird der Abrasionswiderstand des Bindemittels vorzugsweise um das Drei- bis Vierfache erhöht. Die Verstärkung des Bindemittels ist, abhängig von der Menge an Hartstoffteilchen, genau steuerbar.The abrasion resistance of the binder is reduced by the addition of hard material particles preferably increased by three to four times. The reinforcement of the binder is depending on the amount of hard material particles, precisely controllable.

Durch die Zugabe von Hartstoffteilchen entsteht zwangsläufig auch eine Verlangsamung der Bearbeitungsgeschwindigkeit. Da aber die Hartstoffteilchen auch als kleine Schneidkörper wirken, wird ein Teil des Bearbeitungsgeschwindigkeitsverlustes ausgeglichen. Der restliche "Verlust" wird durch die Anpassung der Diamantkornkonzentration kompensiert. Weniger Diamantkörner führen zu einer Erhöhung der Bearbeitungsgeschwindigkeit.The addition of hard material particles inevitably leads to a slowdown the processing speed. But since the hard material particles also as small cutting bodies part of the loss in processing speed is compensated. The remaining "loss" is compensated for by adjusting the diamond grain concentration. Fewer diamond grains increase the processing speed.

Um eine gute Abstützung der Diamantkörner und eine gute Einbindung der Hartstoffteilchen in dem Bindemittel zu erzielen, weisen die Hartstoffteilchen zweckmässigerweise eine Korngrösse von 45 bis 90 µm auf.To provide good support for the diamond grains and good integration of the To achieve hard material particles in the binder, the hard material particles expediently have a grain size of 45 to 90 microns.

Die Hartstoffteilchen bestehen vorteilhafterweise aus Wolframschmelzkarbid. Solche Hartstoffteile zeichnen sich durch ihre hohe Härte aus und wirken ausserdem als zusätzliche Schneiden.The hard material particles advantageously consist of tungsten carbide. Such Hard material parts are characterized by their high hardness and also act as additional To cut.

Die erfindungsgemässen Schneidkörper können verschiedenartigste Formen aufweisen, wobei die Form jeweils auf den Verwendung findenden Träger abgestimmt ist. Je nach Anwendungsfall kann es sich beim Träger um Hohlzylinder, Scheiben, Walzen und dgl. handeln. Während Hohlzylinder insbesondere bei Bohrwerkzeugen Anwendung finden, kann es sich bei Oberflächenbearbeitungs- und Trenngeräten, beispielsweise um Scheiben oder Walzen handeln. Entsprechend diesen Verwendung findenden Trägern weisen die Schneidkörper beispielsweise die Form von Segmenten, Ringen, Scheiben und dgl. auf.The cutting bodies according to the invention can have a wide variety of shapes, the shape being matched to the carrier used. Depending on Use case, the carrier can be hollow cylinders, disks, rollers and the like. act. While hollow cylinders are used particularly in drilling tools, can be surface processing and cutting devices, for example discs or act as rollers. According to this use find carriers the cutting body, for example, the shape of segments, rings, disks and the like. on.

Claims (3)

  1. Cutting element for demolishing tools, for example drills, separating discs, saws, with metal based bonding agents, solid particles and diamond grains serving as cutting elements, characterised by between 6 and 15 %-by-volume diamond grains, 1 to 3 %-by-volume solid particles and 82 to 93 %-by-volume bonding agents relative to the total volume.
  2. Cutting element according to Claim 1, characterised in that the solid particles have a grain size between 45 and 90 µm.
  3. Cutting element according to Claim 1 or 2, characterised in that the solid particles are composed of tungsten melt carbide.
EP19940810258 1993-07-16 1994-05-04 Cutting insert for demolishing tools Expired - Lifetime EP0634250B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4323895 1993-07-16
DE19934323895 DE4323895A1 (en) 1993-07-16 1993-07-16 Cutting body for material-removing tools

Publications (3)

Publication Number Publication Date
EP0634250A2 EP0634250A2 (en) 1995-01-18
EP0634250A3 EP0634250A3 (en) 1995-05-31
EP0634250B1 true EP0634250B1 (en) 1998-04-22

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EP19940810258 Expired - Lifetime EP0634250B1 (en) 1993-07-16 1994-05-04 Cutting insert for demolishing tools

Country Status (9)

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US (1) US5876845A (en)
EP (1) EP0634250B1 (en)
JP (1) JPH0768534A (en)
KR (1) KR100313266B1 (en)
CN (1) CN1076250C (en)
AT (1) ATE165265T1 (en)
CA (1) CA2128071C (en)
DE (2) DE4323895A1 (en)
ES (1) ES2115187T3 (en)

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Also Published As

Publication number Publication date
CA2128071A1 (en) 1995-01-17
CN1076250C (en) 2001-12-19
DE59405758D1 (en) 1998-05-28
KR950002947A (en) 1995-02-16
DE4323895A1 (en) 1995-01-19
CA2128071C (en) 2000-05-23
KR100313266B1 (en) 2002-10-25
EP0634250A2 (en) 1995-01-18
JPH0768534A (en) 1995-03-14
CN1100683A (en) 1995-03-29
ATE165265T1 (en) 1998-05-15
ES2115187T3 (en) 1998-06-16
EP0634250A3 (en) 1995-05-31
US5876845A (en) 1999-03-02

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