WO2008098636A1 - Cutting element for a rock drill and method for producing a cutting element for a rock drill - Google Patents

Cutting element for a rock drill and method for producing a cutting element for a rock drill Download PDF

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Publication number
WO2008098636A1
WO2008098636A1 PCT/EP2007/064119 EP2007064119W WO2008098636A1 WO 2008098636 A1 WO2008098636 A1 WO 2008098636A1 EP 2007064119 W EP2007064119 W EP 2007064119W WO 2008098636 A1 WO2008098636 A1 WO 2008098636A1
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WO
WIPO (PCT)
Prior art keywords
cutting element
zone
rock drill
mixture
producing
Prior art date
Application number
PCT/EP2007/064119
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German (de)
French (fr)
Inventor
Franc Koljaka
Zane Lockhart, Jr.
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP07857747A priority Critical patent/EP2121226A1/en
Publication of WO2008098636A1 publication Critical patent/WO2008098636A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/58—Chisel-type inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware

Definitions

  • the invention relates to a cutting element for a
  • the object of the invention is a cutting element for a rock drill or a method for producing a
  • the rock drill bit according to the invention has a first zone (A) formed from a first mixture and has a second zone (B) formed from a second mixture, the first mixture being from 5.5 to 20 % Co and / or Ni, at least 37% WC and further constituents such as, for example, TiC and / or TaC and / or NbC and / or VC and / or B and / or HfC and / or ZrC and / or CrC and / or Mo2C and wherein the second mixture of 3 to 12.5% Co and / or Ni, at least 78.5% WC - -
  • zone (A) could be used to produce a tougher or more ductile zone suitable for extreme impact loads
  • zone (B) could be used to produce a harder, more wear-resistant or abrasion-resistant zone suitable for highest friction loads.
  • the further constituents for the first mixture have the following proportions: not more than 10% TiC, not more than 15% TaC, not more than 15% NbC, not more than 1% VC and not more than 2% B.
  • the others are Constituents for the second mixture with the following proportions: not more than 2% TiC, not more than 2% TaC, not more than 2% NbC, not more than 1% VC and not more than 2% B.
  • the invention provides to arrange a transition zone between the zones or around at least one zone. This makes it possible to achieve a continuous, not abrupt change in the properties of the cutting element in terms of hardness and abrasion resistance.
  • Cutting elements provide at least two different mixtures corresponding to claim 1 to sinter together. As a result, a particularly good cohesion is achieved between the individual mixtures, which builds up in the manufacturing process. According to the different methods, this can be done by different processes. According to a first method, it is provided to first press the different mixtures and then sinter them. According to a second method, it is provided to inject the different mixtures into a cavity of a tool and then to sinter. A third method involves pressing and sintering the different mixtures simultaneously - -
  • Figures 1 to 4 show schematically differently constructed cutting elements in side view.
  • a first cutting element 1 is shown in side view.
  • the cutting element 1 is
  • the cutting element 1 or the rock drill 2 have a longitudinal axis L, to which the cutting element 1 is symmetrical.
  • zone A is designed in its material properties to extreme shocks, such as those occur in impact drilling, for example, when the rock drill 2 meets with its separating element 1 on particularly hard layers or bodies, for example in reinforced concrete. Compared to zone B, zone A is thus tougher and less resistant to abrasion.
  • FIG 3 which shows a third embodiment of a cutting element 1
  • a tip 5 of the cutting element 1 is formed as a zone A.
  • This zone A is completely delimited from a helix 4 of a rock drill 2 by a harder and more abrasion-resistant zone B.
  • FIG. 4 shows a fourth embodiment variant of a cutting element 1.
  • this zone also has two intermediate transition zones C and D.
  • the hardness increases from the zone A to the zone B in an arrow direction x.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The invention relates to a cutting element for a rock drill and to a method for producing a cutting element for a rock drill.

Description

Beschreibung description
Titeltitle
Schneidelement für einen Gesteinsbohrer und ein Verfahren zurCutting element for a rock drill and a method for
Herstellung eines Schneidelements für einen GesteinsbohrerProduction of a cutting element for a rock drill
Die Erfindung betrifft ein Schneidelement für einenThe invention relates to a cutting element for a
Gesteinsbohrer nach Anspruch 1 und drei Verfahren zur Herstellung eines Schneidelements für einen Gesteinsbohrer nach Ansprüchen 5 bis 7.Rock drill according to claim 1 and three methods for producing a cutting element for a rock drill according to claims 5 to 7.
Aus der DE 33 47 501 Al ist ein Hartmetalleinsatzkörper bekannt, welcher aus fest verbundnen Raumteilen aus hartem und zähen Material besteht.From DE 33 47 501 Al a carbide insert body is known, which consists of firmly connected parts of space hard and tough material.
Aufgabe der Erfindung ist es ein Schneidelement für einen Gesteinsbohrer bzw. eine Verfahren zur Herstellung einesThe object of the invention is a cutting element for a rock drill or a method for producing a
Schneidelements für einen Gesteinsbohrer zu entwickeln, wobei das Schneidelement insbesondere bei einer für ein Schlagbohrwerkzeug typischen Belastung gegenüber bekannten Scheidelementen eine erhöhte Lebensdauer aufweist.To develop cutting elements for a rock drill, wherein the cutting element has an increased life, especially at a typical for a percussion drill load compared to known cutting elements.
Diese Aufgabe wird ausgehend von den Merkmalen des Oberbegriffs des Anspruchs 1 bzw. 5 bis 7 durch die kennzeichnenden Merkmale des Anspruchs 1 bzw. 5 bis 7 gelöst.This object is achieved on the basis of the features of the preamble of claim 1 or 5 to 7 by the characterizing features of claim 1 or 5 to 7.
Das erfindungsgemäße Schneidelement für einen Gesteinsbohrer weist eine erste Zone (A) auf, die aus einer ersten Mischung gebildet ist und weist eine zweite Zone (B) auf, die aus einer zweiten Mischung gebildet ist, wobei die erste Mischung aus 5,5 bis 20 % Co und/oder Ni, mindestens 37 % WC und weiteren Bestandteilen wie zum Beispiel TiC und/oder TaC und/oder NbC und/oder VC und/oder B und/oder HfC und/oder ZrC und/oder CrC und/oder Mo2C zusammengesetzt ist und wobei die zweite Mischung aus 3 bis 12,5 % Co und/oder Ni, mindestens 78,5 % WC - -The rock drill bit according to the invention has a first zone (A) formed from a first mixture and has a second zone (B) formed from a second mixture, the first mixture being from 5.5 to 20 % Co and / or Ni, at least 37% WC and further constituents such as, for example, TiC and / or TaC and / or NbC and / or VC and / or B and / or HfC and / or ZrC and / or CrC and / or Mo2C and wherein the second mixture of 3 to 12.5% Co and / or Ni, at least 78.5% WC - -
und weiteren Bestandteilen wie zum Beispiel TiC und/oder TaC und/oder NbC und/oder VC und/oder B und/oder HfC und/oder ZrC und/oder CrC und/oder Mo2C zusammengesetzt ist. Durch eine derartige Zusammensetzung der Zonen konnte mit der Zone (A) eine für extreme Schlagbelastungen geeignete zähere bzw. duktilere Zone und mit der Zone (B) eine für höchste Reibbelastungen geeignete härtere und verschleißfestere bzw. abriebfestere Zone realisiert werden. Gemäß einer speziellen Ausführungsvariante liegen die weiteren Bestandteile für die erste Mischung mit folgenden Anteilen vor: höchstens 10 % TiC, höchstens 15 % TaC, höchstens 15 % NbC, höchstens 1% VC und höchstens 2 % B. Gemäß einer weiteren speziellen Ausführungsvariante liegen die weiteren Bestandteile für die zweite Mischung mit folgenden Anteilen vor: höchstens 2 % TiC, höchstens 2 % TaC, höchstens 2 % NbC, höchstens 1% VC und höchstens 2 % B.and further constituents such as, for example, TiC and / or TaC and / or NbC and / or VC and / or B and / or HfC and / or ZrC and / or CrC and / or Mo2C. By means of such a composition of the zones, zone (A) could be used to produce a tougher or more ductile zone suitable for extreme impact loads, and zone (B) could be used to produce a harder, more wear-resistant or abrasion-resistant zone suitable for highest friction loads. According to a specific embodiment, the further constituents for the first mixture have the following proportions: not more than 10% TiC, not more than 15% TaC, not more than 15% NbC, not more than 1% VC and not more than 2% B. According to another specific embodiment, the others are Constituents for the second mixture with the following proportions: not more than 2% TiC, not more than 2% TaC, not more than 2% NbC, not more than 1% VC and not more than 2% B.
Weiterhin sieht die Erfindung vor, zwischen den Zonen oder um wenigstens eine Zone herum eine Übergangszone anzuordnen. Hierdurch ist es möglich, eine kontinuierliche, nicht sprunghaftende Veränderung der Eigenschaften des Schneidelements in bezug auf Härte und Abriebfestigkeit zu erreichen .Furthermore, the invention provides to arrange a transition zone between the zones or around at least one zone. This makes it possible to achieve a continuous, not abrupt change in the properties of the cutting element in terms of hardness and abrasion resistance.
Die erfindungsgemäßen Verfahren zur Herstellung einesThe inventive method for producing a
Schneidelements sehen vor, wenigstens zwei unterschiedliche Mischungen entsprechende dem Anspruch 1 gemeinsam zu sintern. Hierdurch wird ein besonders guter Zusammenhalt zwischen den einzelnen Mischungen erreicht, welcher sich im Herstellungsprozess aufbaut. Entsprechend den unterschiedlichen Verfahren kann dies durch unterschiedliche Abläufe erfolgen. Gemäß einem ersten Verfahren ist es vorgesehen die unterschiedlichen Mischungen zunächst zu pressen und anschließend zu sintern. Gemäß einem zweiten Verfahren ist es vorgesehen, die unterschiedlichen Mischungen in einen Hohlraum eines Werkzeugs einzuspritzen und dann zu sintern. Ein drittes Verfahren sieht vor, das Pressen und Sintern der unterschiedlichen Mischungen gleichzeitig - -Cutting elements provide at least two different mixtures corresponding to claim 1 to sinter together. As a result, a particularly good cohesion is achieved between the individual mixtures, which builds up in the manufacturing process. According to the different methods, this can be done by different processes. According to a first method, it is provided to first press the different mixtures and then sinter them. According to a second method, it is provided to inject the different mixtures into a cavity of a tool and then to sinter. A third method involves pressing and sintering the different mixtures simultaneously - -
durchzuf(ihren .durchzuf (their.
Die in der Beschreibung und in den Ansprüchen verwendeten Abkürzungen stehen für folgende Elemente bzw. Verbindungen:The abbreviations used in the description and in the claims stand for the following elements or compounds:
B Bor CrC Chromium-CarbidB boron CrC chromium carbide
Co Kobald HfC Hafnium-CarbidCo Kobald HfC hafnium carbide
Mo2C Molybdän-Carbid NbC Niobium-CarbidMo2C molybdenum carbide NbC niobium carbide
Ni Nickel TaC Tantal-CarbidNi nickel TaC tantalum carbide
TiC Titanium-Carbid VC Vanadium-CarbidTiC Titanium Carbide VC Vanadium Carbide
WC Wolfram-Carbid ZrC Zirkonium-CarbidWC tungsten carbide ZrC zirconium carbide
Weitere Einzelheiten der Erfindung werden in der Zeichnung anhand von schematischen Ausführungsbeispielen gezeigt.Further details of the invention are shown in the drawing with reference to schematic embodiments.
Hierbei zeigen die Figuren 1 bis 4 schematisch unterschiedlich aufgebaute Schneidelemente in Seitenansicht.Here, Figures 1 to 4 show schematically differently constructed cutting elements in side view.
In der Figur 1 ist ein erstes Schneidelement 1 in Seitenansicht dargestellt. Das Schneidelement 1 istIn the figure 1, a first cutting element 1 is shown in side view. The cutting element 1 is
Bestandteil eines Gesteinsbohrers 2 und in herkömmlicher Weise an einem freien Ende 3 einer Wendel 4 eines Gesteinsbohrers 2 befestigt. Das Schneidelement 1 bzw. der Gesteinsbohrer 2 weisen eine Längsachse L auf, zu welcher das Schneidelement 1 symmetrische ausgebildet ist. Eine erste Zone A desComponent of a rock drill 2 and in a conventional manner attached to a free end 3 of a coil 4 of a rock drill 2. The cutting element 1 or the rock drill 2 have a longitudinal axis L, to which the cutting element 1 is symmetrical. A first zone A of the
Scheidelements 1 ist um die Längsachse L herum ausgebildet. Seitlich schließt sich an die Zone A eine Zone B an. Die Zone A ist in ihren Materialeigenschaften auf extreme Schläge ausgelegt, wie diese beim Schlagbohren beispielsweise auftreten, wenn der Gesteinsbohrer 2 mit seinem Scheidelement 1 auf besonders harte Schichten bzw. Stellen beispielsweise im Stahlbeton trifft. Gegenüber der Zone B ist die Zone A also zäher und weniger abriebfest.Divider 1 is formed around the longitudinal axis L around. On the side of zone A, a zone B follows. The zone A is designed in its material properties to extreme shocks, such as those occur in impact drilling, for example, when the rock drill 2 meets with its separating element 1 on particularly hard layers or bodies, for example in reinforced concrete. Compared to zone B, zone A is thus tougher and less resistant to abrasion.
In der Figur 2 ist eine Ausführungsvariante einesIn the figure 2 is an embodiment of a
Schneidelements 1 dargestellt. Bei diesem verbreitert sich eine härtere und abriebfestere Zone B in eine Wirkrichtung des Schneidelements 1. Im Zentrum besitzt das Schneidelement 1 - -Cutting elements 1 shown. In this case, a harder and more abrasion-resistant zone B widened in a direction of action of the cutting element 1. In the center has the cutting element. 1 - -
wieder eine zähere Zone A.again a tougher zone A.
In der Figur 3, welche eine dritte Ausführungsvariante eines Schneidelements 1 zeigt, ist lediglich eine Spitze 5 des Schneidelements 1 als Zone A ausgebildet. Diese Zone A ist gegenüber einer Wendel 4 eines Gesteinsbohrers 2 vollständig durch eine härtere und abriebfestere Zone B abgegrenzt.In the figure 3, which shows a third embodiment of a cutting element 1, only a tip 5 of the cutting element 1 is formed as a zone A. This zone A is completely delimited from a helix 4 of a rock drill 2 by a harder and more abrasion-resistant zone B.
Die Figur 4 zeigt schließlich eine vierte Ausführungsvariante eines Schneidelements 1. Diese weist neben einer Zone A und einer Zone B noch zwei zwischengelagerte Übergangszonen C und D auf. In den Übergangszonen C und D nimmt die Härte von der Zone A zu der Zone B in eine Pfeilrichtung x zu.Finally, FIG. 4 shows a fourth embodiment variant of a cutting element 1. In addition to a zone A and a zone B, this zone also has two intermediate transition zones C and D. In the transition zones C and D, the hardness increases from the zone A to the zone B in an arrow direction x.
Die Erfindung ist nicht auf dargestellte und beschrieben Ausführungsbeispiele beschränkt. Sie umfasst auch alle Ergänzungen und Verbesserungen im Rahmen der Schutzrechtsansprüche . The invention is not limited to illustrated and described embodiments. It also includes all additions and improvements within the scope of the property rights claims.

Claims

- -Ansprüche - -Claims
1. Schneidelement (1) für einen Gesteinsbohrer (2), wobei das Schneidelement (1) wenigstens zwei Zonen (A, B) mit unterschiedlichen mechanischen und/oder physikalischen Eigenschaften aufweist, dadurch gekennzeichnet, dass die erste Zone (A) aus einer ersten Mischung gebildet ist und dass die zweite Zone (B) aus einer zweiten Mischung gebildet ist, wobei die erste Mischung aus 5,5 bis 20 % Co und/oder Ni, mindestens 37 % WC und weiteren Bestandteilen wie zum Beispiel TiC und/oder TaC und/oder NbC und/oder VC und/oder B und/oder HfC und/oder ZrC und/oder CrC und/oder Mo2C zusammengesetzt ist und wobei die zweite Mischung aus 3 bis 12,5 % Co und/oder Ni, mindestens 78,5 % WC und weiteren Bestandteilen wie zum Beispiel TiC und/oder TaC und/oder NbC und/oder VC und/oder B und/oder HfC und/oder ZrC und/oder CrC und/oder Mo2C zusammengesetzt ist.1. Cutting element (1) for a rock drill (2), wherein the cutting element (1) has at least two zones (A, B) with different mechanical and / or physical properties, characterized in that the first zone (A) of a first Mixture is formed and that the second zone (B) is formed from a second mixture, wherein the first mixture of 5.5 to 20% Co and / or Ni, at least 37% WC and other ingredients such as TiC and / or TaC and / or NbC and / or VC and / or B and / or HfC and / or ZrC and / or CrC and / or Mo2C and wherein the second mixture of 3 to 12.5% Co and / or Ni, at least 78 , 5% WC and other constituents such as, for example, TiC and / or TaC and / or NbC and / or VC and / or B and / or HfC and / or ZrC and / or CrC and / or Mo2C.
2. Schneidelement (1) nach Anspruch 1, dadurch gekennzeichnet, dass zwischen der ersten Zone (A) und der zweiten Zone (B) und/oder um die erste Zone (A) herum und/oder um die zweite Zone (B) herum wenigstens eine Übergangszone (C, D) ausgebildet ist.2. Cutting element (1) according to claim 1, characterized in that between the first zone (A) and the second zone (B) and / or around the first zone (A) around and / or around the second zone (B) around at least one transition zone (C, D) is formed.
3. Schneidelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Mischung an weiteren Bestandteilen höchstens 10 % TiC, höchstens 15 % TaC, höchstens 15 % NbC, höchstens 1% VC und höchstens 2 % B aufweist .3. Cutting element according to one of the preceding claims, characterized in that the first mixture of further constituents at most 10% TiC, at most 15% TaC, at most 15% NbC, at most 1% VC and at most 2% B.
4. Schneidelement nach einem der vorhergehenden Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die zweite Mischung an weiteren Bestandteilen höchstens 2 % TiC, höchstens 2 % TaC, höchstens 2 % NbC, höchstens 1% VC und höchstens 2 % B aufweist . - -4. Cutting element according to one of the preceding claims 1 to 2, characterized in that the second mixture of further constituents at most 2% TiC, at most 2% TaC, at most 2% NbC, at most 1% VC and at most 2% B. - -
5. Verfahren zur Herstellung eines Schneidelements (1) für einen Gesteinsbohrer mit mehreren Zonen (A, B) entsprechend dem Anspruch 1, dadurch gekennzeichnet, dass wenigstens zwei Raumabschnitte einer Herstellungsform mit wenigstens zwei verschiedenen Mischungen befüllt werden und dass die Mischungen anschließend gepresst und gesintert werden.5. A method for producing a cutting element (1) for a rock drill with multiple zones (A, B) according to claim 1, characterized in that at least two space sections of a production mold are filled with at least two different mixtures and that the mixtures are then pressed and sintered become.
6. Verfahren zur Herstellung eines Schneidelements (1) für einen Gesteinsbohrer mit mehreren Zonen (A, B) entsprechend dem Anspruch 1, dadurch gekennzeichnet, dass wenigstens zwei verschiedne Mischungen in wenigstens zwei Raumabschnitte einer Herstellungsform eingespritzt und nach dem Einspritzvorgang gesintert werden.6. A method for producing a cutting element (1) for a rock drill with multiple zones (A, B) according to claim 1, characterized in that at least two different mixtures are injected into at least two space sections of a manufacturing mold and sintered after the injection process.
7. Verfahren zur Herstellung eines Schneidelements (1) für einen Gesteinsbohrer mit mehreren Zonen (A, B) entsprechend dem Anspruch 1, dadurch gekennzeichnet, dass wenigstens zwei Raumabschnitte einer Herstellungsform mit wenigstens zwei verschiedenen Mischungen befüllt werden und dass anschließend zeitgleich ein Sintern und ein Pressen erfolgt. 7. A method for producing a cutting element (1) for a multi-zone rock drill (A, B) according to claim 1, characterized in that at least two space sections of a manufacturing mold are filled with at least two different mixtures and then at the same time a sintering and a Pressing takes place.
PCT/EP2007/064119 2007-02-13 2007-12-18 Cutting element for a rock drill and method for producing a cutting element for a rock drill WO2008098636A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07857747A EP2121226A1 (en) 2007-02-13 2007-12-18 Cutting element for a rock drill and method for producing a cutting element for a rock drill

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Application Number Priority Date Filing Date Title
DE102007006943.1 2007-02-13
DE200710006943 DE102007006943A1 (en) 2007-02-13 2007-02-13 Cutting element for a rock drill and a method for producing a cutting element for a rock drill

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US9643236B2 (en) 2009-11-11 2017-05-09 Landis Solutions Llc Thread rolling die and method of making same
US9539652B2 (en) 2010-04-30 2017-01-10 Kennametal Inc. Rotary cutting tool having PCD cutting tip
US10328536B2 (en) 2010-04-30 2019-06-25 Kennametal Inc. Rotary cutting tool having PCD cutting tip
US9180532B2 (en) 2011-07-11 2015-11-10 Kennametal, Inc. Multi-piece twist drill head and twist drill including the same
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