EP0168379B1 - Drilling tool, especially a drill bit - Google Patents

Drilling tool, especially a drill bit Download PDF

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Publication number
EP0168379B1
EP0168379B1 EP85890130A EP85890130A EP0168379B1 EP 0168379 B1 EP0168379 B1 EP 0168379B1 EP 85890130 A EP85890130 A EP 85890130A EP 85890130 A EP85890130 A EP 85890130A EP 0168379 B1 EP0168379 B1 EP 0168379B1
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EP
European Patent Office
Prior art keywords
drilling tool
drilling
recess
nozzle
rock
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
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EP85890130A
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German (de)
French (fr)
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EP0168379A1 (en
Inventor
Kurt Dipl.-Ing. Hölzl
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Vereinigte Edelstahlwerke AG
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Vereinigte Edelstahlwerke AG
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Priority to AT85890130T priority Critical patent/ATE35018T1/en
Publication of EP0168379A1 publication Critical patent/EP0168379A1/en
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    • 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
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E21B10/61—Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure

Definitions

  • the invention relates to a drilling tool, in particular a drill bit for liquid jet-assisted, in particular rotating, drilling in rock with a drilling tool body which, in particular with carbide, has cutting edges, pins or the like, with at least one feed for a fluid pressure medium with a pressure between 500 and 4000 bar, which opens into at least one nozzle detachably inserted in the drilling tool body.
  • Drilling tools whether for hammering or rotating drilling in rock, have to perform various tasks.
  • the rock can be subjected to relatively high compressive loads, whereas the tensile strength of rock is generally low.
  • the drill bit now serves as a force-transmitting element between the drill drive and the rock.
  • the rock is initially elastically deformed due to the force exerted by the drill bit, in particular the cutting edges, whereby pressure cracks and shear cracks occur in the rock at the same time.
  • rock particles have to be removed from the dressing and removed from the immediate area of effectiveness of the cutting edges.
  • Such removal must therefore be carried out so that the energy applied by the drilling unit is not used to further shred the cuttings, as a result of which a cushion is built up between the rock to be removed and the cutting edges.
  • fluids in particular gases or liquids.
  • the liquids can also have suspended matter so that even heavier substances can be discharged from the borehole.
  • the rock mining is not supported by such flushing liquids.
  • the water jet enters existing cracks, cracks, and the like, or results from the action of the drill bit on the rock, and loosens the rock structure, so that the liquid jet, in particular water jet, has an additional erosive effect.
  • This effect usually occurs at a pressure between 500 and 4000 bar.
  • the jet can cooperate with the cutting edges of the drill bit, that is to say that the jets are directed to those places of the rock where the cracks occur. If one takes into account that there is a close interaction between crack growth and arrangement of the cutting edges on the drill bit, the high importance of the exact alignment of the liquid jet or jets becomes particularly clear.
  • the liquid jets exit the drilling tool through nozzles, the nozzles being made of corundum, for example, and having a passage opening that is only a fraction of a millimeter. Since the nozzles generally have a shorter service life than the drill bits as such, these nozzles should be releasably connected to the drill bit.
  • a nozzle which is suitable for the formation of a fine water jet.
  • the supporting body can be screwed on and is closed at the end by a panel mounted in a rubber ring.
  • the through hole is gradually expanded and extends to a hexagon hole, which is used to hold a tool.
  • a conical area on the outside ensures centering and sealing.
  • the screen is guided in a rubber ring, it is difficult to position it when it is replaced and stable guidance is not provided.
  • the present invention has for its object to provide a drilling tool for liquid jet-assisted, in particular rotating drilling in rock, in which the nozzles for the liquid jet, in particular water jet, are precisely positioned, with an exchange of these nozzles an identical water jet direction as before the exchange should be guaranteed.
  • the aim is achieved in that the nozzle is constructed with a nozzle block and a holding body which extends longitudinally in the jet direction, the holding body being releasably held in a recess, in particular a bore of the drilling tool body, via an annular body, and a cylindrical extension, in particular a shaft, has, which abuts a cylindrical recess of the ring body, the shaft extending in the same longitudinal extent extending recess for the passage of the bundled liquid jet.
  • the nozzle block is contained in a holding body extending longitudinally in the jet direction, it can be held completely exactly over the ring body in the recess of the drilling tool body, so that an exact and reproducible fixing of the nozzle block and thus the high-pressure jet is achieved, with an exchange of the Nozzle can be carried out by easy-to-use tools, if necessary on site.
  • the holding body has at least one rotationally symmetrical guide surface which bears against a correspondingly designed guide surface of the ring body, particularly precise and exact positioning can be achieved.
  • the nozzle can be exchanged particularly easily if the ring body has an external thread and the recess in the drilling tool body has a corresponding internal thread.
  • the ring body has a polygon, in particular an polygon.
  • the recess in the drilling tool body has a conical seat for the holding body of the nozzle block, self-adjustment is ensured in a particularly advantageous manner.
  • a sealing ring is provided in an annular recess between the seat in the recess of the drilling tool body and the holding part for the nozzle, then a particularly permanent sealing can take place with little effort and thus little deformation of the seat.
  • a particularly simple variant of the nozzle body is obtained if the annular recess for the sealing ring is provided in the seat of the recess in the drilling tool body.
  • FIG. 1 shows a drill bit in a side view
  • FIG. 2 shows a drill bit in a top view
  • FIG. 3 shows a section through a nozzle in the drill bit.
  • the drill bit consists of a drilling tool body 1 which is provided with cutting edges 2 made of hard metal. Instead of the cutting edges, diamonds or other cutting inserts embedded in the core bit material can also be provided.
  • the drilling tool body also has a feed 3 for the fluid pressure medium, namely water. This feed branches into several feeds 4, only two of which are shown, which open into the schematically illustrated nozzles 5.
  • FIG. 2 which shows a top view of the drill bit according to FIG. 1, the nozzles 5 are arranged in a specific manner depending on the cutting edges 2.
  • a recess 6 is shown in the drilling tool body 1, which has an internal thread 7.
  • This recess has an annular extension 8 on its base, which merges into a conical seat 9.
  • the water jet emerges in the direction of arrow a.
  • the holding body 10 is provided with nozzle block 11, the nozzle block in a cylindrical recess of the holding body, for. B. is fixed by a plastic mass 12.
  • the holding body 10 has a cylindrical shaft 13, the cylindrical guide surface 14 of which cooperates with the cylindrical guide surface 15 of the ring body 16.
  • the holding body 10 has a longitudinally extending recess 17 through which the water jet exits in the direction of arrow a.
  • the passage opening of the nozzle block is substantially smaller than the free cross section of this recess 17.
  • the ring body 16 has an external thread 18 which cooperates with the internal thread 7. Furthermore, the ring body has a hexagon 19 at the end of the drill bit facing the free surface, which is used to attack a corresponding Allen key or the like.
  • an annular groove 20 is provided, in which a sealing ring 21 is arranged.
  • Other drilling tools that can be used are, for example, those with drilling rollers, pins, corundum- or diamond-studded or the like.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)

Abstract

A drilling bit, such as a crenellated drilling bit for fluid-jet supported rotary drilling in rock comprises a nozzle for directing a jet of high-pressure fluid against rock material being bored. In addition to transporting away rock chips, the jet penetrates fissures in the rock and supports the breaking down of the rock structure by the drilling bit. Since such nozzles tend to wear more rapidly than the cutting edges of the drilling bit, a readily exchangeable nozzle insert is provided. The nozzle insert is seated in a retaining body incorporated in the drilling bit and is held in the retaining body by a threaded annular cap. The annular cap has a hexagonal recess for accommodating a tool such as an Allan-key.

Description

Die Erfindung bezieht sich auf ein Bohrwerkzeug, insbesondere Bohrkrone für flüssigkeitsstrahlunterstütztes, insbesondere drehendes, Bohren im Gestein mit einem Bohrwerkzeugkörper, der, insbesondere mit Hartmetall aufgebaute, Bohrschneiden, Stifte od. dgl. aufweist, mit zumindest einer Zuführung für ein fluides Druckmedium mit einem Druck zwischen 500 und 4000 bar, die in zumindest eine im Bohrwerkzeugkörper lösbar eingesetzte Düse mündet.The invention relates to a drilling tool, in particular a drill bit for liquid jet-assisted, in particular rotating, drilling in rock with a drilling tool body which, in particular with carbide, has cutting edges, pins or the like, with at least one feed for a fluid pressure medium with a pressure between 500 and 4000 bar, which opens into at least one nozzle detachably inserted in the drilling tool body.

Bohrwerkzeuge, sei es für das schlagende oder das rein drehende Bohren im Gestein, müssen verschiedene Aufgaben erfüllen. Das Gestein kann relativ hohen Druckbeanspruchungen ausgesetzt werden, wohingegen die Zugfestigkeit von Gestein in der Regel gering ist. Die Bohrkrone dient nun als kraftübertragendes Element zwischen dem Bohrantrieb und dem Gestein. Durch die Krafteinwirkung der Bohrkrone, insbesondere der Bohrschneiden, wird das Gestein anfangs elastisch deformiert, wobei gleichzeitig Druckrisse und Schubrisse im Gestein entstehen. Gleichzeitig müssen Gesteinspartikelchen aus dem Verband gelöst werden und aus dem unmittelbaren Wirksamkeitsbereich der Schneiden entfernt werden. Eine derartige Entfernung muß deshalb durchgeführt werden, damit die von dem Bohraggregat aufgebrachte Energie nicht dazu verwendet wird, daß Bohrklein weiter zu zerkleinern, wodurch ein Polster zwischen dem abzutragenden Gestein und den Bohrschneiden aufgebaut wird. Zum Austragen des Bohrkleins ist es bekannt, Fluide, insbesondere Gase oder Flüssigkeiten zu verwenden. Die Flüssigkeiten können auch noch Schwebstoffe aufweisen, damit auch spezifisch schwerere Substanzen aus dem Bohrloch ausgetragen werden können. Ein Unterstützen des Gesteinsabbaus durch derartige Spülflüssigkeiten tritt jedoch nicht ein.Drilling tools, whether for hammering or rotating drilling in rock, have to perform various tasks. The rock can be subjected to relatively high compressive loads, whereas the tensile strength of rock is generally low. The drill bit now serves as a force-transmitting element between the drill drive and the rock. The rock is initially elastically deformed due to the force exerted by the drill bit, in particular the cutting edges, whereby pressure cracks and shear cracks occur in the rock at the same time. At the same time, rock particles have to be removed from the dressing and removed from the immediate area of effectiveness of the cutting edges. Such removal must therefore be carried out so that the energy applied by the drilling unit is not used to further shred the cuttings, as a result of which a cushion is built up between the rock to be removed and the cutting edges. To discharge the cuttings, it is known to use fluids, in particular gases or liquids. The liquids can also have suspended matter so that even heavier substances can be discharged from the borehole. However, the rock mining is not supported by such flushing liquids.

Beim wasserstrahlunterstützten Schneiden tritt der Wasserstrahl in bereits bestehende oder durch die Krafteinwirkung der Bohrkrone auf das Gestein entstandene Sprünge, Risse, und dgl. ein, und lockert den Gesteinsverband, sodaß dem Flüssigkeitsstrahl, insbesondere Wasserstrahl, eine zusätzliche abtragende Wirkung zuzuschreiben ist. Diese Wirkung tritt in der Regel bei einem Druck zwischen 500 und 4000 bar auf.In the case of water jet-assisted cutting, the water jet enters existing cracks, cracks, and the like, or results from the action of the drill bit on the rock, and loosens the rock structure, so that the liquid jet, in particular water jet, has an additional erosive effect. This effect usually occurs at a pressure between 500 and 4000 bar.

Wesentlich für die Wirkung der Hochdruckmediumstrahlen ist, daß der Strahl mit den Schneiden der Bohrkrone kooperieren kann, das heißt, daß die Strahlen an jene Stellen des Gesteins gelenkt werden, wo die Risse auftreten. Berücksichtigt man, daß eine enge Wechselwirkung zwischen Rißwachstum und Anordnung der Schneidkanten auf der Bohrkrone besteht, so wird die hohe Bedeutung der exakten Ausrichtung des oder der Flüssigkeitsstrahlen besonders deutlich.It is essential for the action of the high-pressure medium jets that the jet can cooperate with the cutting edges of the drill bit, that is to say that the jets are directed to those places of the rock where the cracks occur. If one takes into account that there is a close interaction between crack growth and arrangement of the cutting edges on the drill bit, the high importance of the exact alignment of the liquid jet or jets becomes particularly clear.

Die Flüssigkeitsstrahlen treten durch Düsen aus dem Bohrwerkzeug aus, wobei die Düsen beispielsweise aus Korund bestehen, und eine Durchtrittsöffnung aufweisen, die nur den Bruchteil eines Millimeters beträgt. Da die Düsen in der Regel eine geringere Standzeit als die Bohrkronen als solche aufweisen, sollen diese Düsen lösbar mit der Bohrkrone verbunden werden.The liquid jets exit the drilling tool through nozzles, the nozzles being made of corundum, for example, and having a passage opening that is only a fraction of a millimeter. Since the nozzles generally have a shorter service life than the drill bits as such, these nozzles should be releasably connected to the drill bit.

Bei einer Bohrkrone für flüssigkeitsstrahlunterstütztes Bohren ist es bereits bekannt geworden, die scheibenförmige Düse durch eine Überwurfmutter, welche einen Schlitz zur Betätigung mit einem Schraubenzieher aufweist, an der Bohrkrone zu befestigen. Damit kann zwar ein Austausch der feinteiligen Düse auch mit gröberem Werkzeug durchgeführt werden, wobei allerdings eine genaue Positionierung der Düse und auch eine optimale Abdichtung, wodurch ein entsprechender Druckverlust vermieden wird, in der Regel spätestens nach Austausch der Düsen nicht mehr gewährleistet sind.In the case of a drill bit for liquid-jet assisted drilling, it has already become known to fasten the disk-shaped nozzle to the drill bit by means of a union nut which has a slot for actuation with a screwdriver. This means that an exchange of the fine-particle nozzle can also be carried out with a coarser tool, but an exact positioning of the nozzle and also an optimal seal, which prevents a corresponding pressure loss, are generally no longer guaranteed after replacement of the nozzles.

Weiters ist aus der DE-A-3 029 963, insbesondere Fig. 5, eine Düse bekannt, die sich für die Bildung eines feinen Wasserstrahles eignet. Ähnlich einer Rohrverschraubung ist der Tragkörper anschraubbar und am Ende durch eine in einen Gummiring gelagerte Blende abgeschlossen. Die Durchgangsbohrung ist stufenweise erweitert und reicht bis zu einem Sechskantloch, das zur Aufnahme eines Werkzeuges dient. Ein an der Außenseite angeordneter konischer Bereich sorgt für Zentrierung und Abdichtung. Da aber die Blende in einem Gummiring geführt ist, ist eine Positionierung bei Austausch nur schwer möglich und eine stabile Führung nicht gegeben.Furthermore, from DE-A-3 029 963, in particular Fig. 5, a nozzle is known which is suitable for the formation of a fine water jet. Similar to a pipe screw connection, the supporting body can be screwed on and is closed at the end by a panel mounted in a rubber ring. The through hole is gradually expanded and extends to a hexagon hole, which is used to hold a tool. A conical area on the outside ensures centering and sealing. However, since the screen is guided in a rubber ring, it is difficult to position it when it is replaced and stable guidance is not provided.

Ferner ist aus US-A-3 120 284 eine Düsenanordnung bekannt geworden, die aus einem Einschraubkörper besteht, in dem eine Blende befestigt ist. Mit Hilfe einer Dichtmasse ist die Blende im Einschraubkörper eingebettet. Diese Anordnung eignet sich jedoch weniger für hohe Betriebsdrücke, da die Bohrung für den Wasserstrahl zu groß ist.Furthermore, from US-A-3 120 284 a nozzle arrangement has become known which consists of a screw-in body in which a screen is fastened. The cover is embedded in the screw-in body with the help of a sealing compound. However, this arrangement is less suitable for high operating pressures because the bore is too large for the water jet.

Die vorliegende Erfindung hat sich zur Aufgabe gestellt, ein Bohrwerkzeug für flüssigkeitsstrahlunterstütztes, insbesondere drehendes Bohren in Gestein zu schaffen, bei welcher die Düsen für den Flüssigkeitsstrahl, insbesondere Wasserstrahl, genau positioniert werden, wobei bei einem Austausch dieser Düsen eine identische Wasserstrahlrichtung wie vor dem Austausch gewährleistet sein soll. Erfindungsgemäß wird das Ziel dadurch erreicht, daß die Düse mit einem Düsenstein und einem sich in Strahlrichtung längserstreckenden Haltekörper aufgebaut ist, wobei der Haltekörper über einen Ringkörper in einer Ausnehmung, insbesondere Bohrung des Bohrwerkzeugkörpers, lösbar gehalten ist, und einen zylindrischen Ansatz, insbesondere Schaft, aufweist, welcher an einer zylindrischen Ausnehmung des Ringkörpers anliegt, wobei der Schaft eine sich in Längserstreckung desselben erstreckende Ausnehmung für den Durchtritt des gebündelten Flüssigkeitsstrahles aufweist. Dadurch, daß der Düsenstein in einem sich in Strahlrichtung längserstreckenden Haltekörper enthalten ist, kann dieser vollkommen exakt über den Ringkörper in der Ausnehmung des Bohrwerkzeugkörpers gehalten werden, sodaß eine exakte und reproduzierbare Festlegung des Düsensteins und damit des Hochdruckstrahles erreicht ist, wobei auch ein Austausch der Düse durch einfach zu handhabendes Werkzeug, gegebenenfalls vorort, durchführbar ist.The present invention has for its object to provide a drilling tool for liquid jet-assisted, in particular rotating drilling in rock, in which the nozzles for the liquid jet, in particular water jet, are precisely positioned, with an exchange of these nozzles an identical water jet direction as before the exchange should be guaranteed. According to the invention, the aim is achieved in that the nozzle is constructed with a nozzle block and a holding body which extends longitudinally in the jet direction, the holding body being releasably held in a recess, in particular a bore of the drilling tool body, via an annular body, and a cylindrical extension, in particular a shaft, has, which abuts a cylindrical recess of the ring body, the shaft extending in the same longitudinal extent extending recess for the passage of the bundled liquid jet. Characterized in that the nozzle block is contained in a holding body extending longitudinally in the jet direction, it can be held completely exactly over the ring body in the recess of the drilling tool body, so that an exact and reproducible fixing of the nozzle block and thus the high-pressure jet is achieved, with an exchange of the Nozzle can be carried out by easy-to-use tools, if necessary on site.

Weist der Haltekörper zumindest eine rotationssymmetrische Führungsfläche auf, die an einer entsprechend ausgebildeten Führungsfläche des Ringkörpers anliegt, so kann eine besonders genaue und exakte Positionierung erreicht werden.If the holding body has at least one rotationally symmetrical guide surface which bears against a correspondingly designed guide surface of the ring body, particularly precise and exact positioning can be achieved.

Eine besonders einfache Austauschbarkeit der Düse ist dann gegeben, wenn der Ringkörper ein Außengewinde und die Ausnehmung im Bohrwerkzeugkörper ein entsprechendes Innengewinde aufweist.The nozzle can be exchanged particularly easily if the ring body has an external thread and the recess in the drilling tool body has a corresponding internal thread.

Eine sichere oftmalige Verwendung des Ringkörpers ist dann gewährleistet, wenn derselbe einen Mehrkant, insbesondere einen Innenmehrkant, aufweist.Safe, frequent use of the ring body is ensured if it has a polygon, in particular an polygon.

Weist die Ausnehmung im Bohrwerkzeugkörper einen konischen Sitz für den Haltekörper des Düsensteins auf, so ist auf besonders vorteilhafte Weise eine Selbstjustierung gewährleistet.If the recess in the drilling tool body has a conical seat for the holding body of the nozzle block, self-adjustment is ensured in a particularly advantageous manner.

Ist zwischen Sitz in der Ausnehmung des Bohrwerkzeugkörpers und dem Halteteil für die Düse ein Dichtring in einer ringförmigen Ausnehmung vorgesehen, so kann eine besonders dauerhafte Abdichtung unter geringer Kraftaufwendung und damit geringe Deformation des Sitzes stattfinden.If a sealing ring is provided in an annular recess between the seat in the recess of the drilling tool body and the holding part for the nozzle, then a particularly permanent sealing can take place with little effort and thus little deformation of the seat.

Eine besonders einfache Variante des Düsenkörpers ergibt sich dann, wenn die ringförmige Ausnehmung für den Dichtungsring im Sitz der Ausnehmung im Bohrwerkzeugkörper vorgesehen ist.A particularly simple variant of the nozzle body is obtained if the annular recess for the sealing ring is provided in the seat of the recess in the drilling tool body.

Im folgenden wird die Erfindung anhand der Zeichnungen näher erläutert.The invention is explained in more detail below with reference to the drawings.

Es zeigen Fig. 1 eine Bohrkrone in Seitenansicht, Fig. 2 eine Bohrkrone in Draufsicht und Fig. 3 den Schnitt durch eine Düse in der Bohrkrone.1 shows a drill bit in a side view, FIG. 2 shows a drill bit in a top view, and FIG. 3 shows a section through a nozzle in the drill bit.

Wie aus Fig. 1 ersichtlich, besteht die Bohrkrone aus einem Bohrwerkzeugkörper 1, der mit Bohrschneiden 2 aus Hartmetall versehen ist. Anstelle der Bohrschneiden können auch in das Bohrkronenmaterial eingebettete Diamanten oder andere Schneideinsätze vorgesehen sein. Der Bohrwerkzeugkörper weist weiter eine Zuführung 3 für das fluide Druckmedium, und zwar Wasser, auf. Diese Zuführung verzweigt sich zu mehreren Zuführungen 4, von denen nur zwei dargestellt sind, die in die schematisch dargestellten Düsen 5 münden.As can be seen from FIG. 1, the drill bit consists of a drilling tool body 1 which is provided with cutting edges 2 made of hard metal. Instead of the cutting edges, diamonds or other cutting inserts embedded in the core bit material can also be provided. The drilling tool body also has a feed 3 for the fluid pressure medium, namely water. This feed branches into several feeds 4, only two of which are shown, which open into the schematically illustrated nozzles 5.

Wie aus Fig. 2 ersichtlich, die eine Draufsicht auf die Bohrkrone gemäß Fig. 1 darstellt, sind die Düsen 5 in bestimmter Abhängigkeit von den Bohrschneiden 2 angeordnet.As can be seen from FIG. 2, which shows a top view of the drill bit according to FIG. 1, the nozzles 5 are arranged in a specific manner depending on the cutting edges 2.

In Fig. 3 ist im Bohrwerkzeugkörper 1 eine Ausnehmung 6 dargestellt, die ein Innengewinde 7 aufweist. Diese Ausnehmung weist an ihrem Boden eine ringförmige Erweiterung 8 auf, welche in einen konischen Sitz 9 übergeht. Der Wasserstrahl tritt in Richtung des Pfeiles a aus. In der Ausnehmung 6 ist der Haltekörper 10 mit Düsenstein 11 vorgesehen, wobei der Düsenstein in einer zylindrischen Ausnehmung des Haltekörpers, z. B. durch eine Kunststoffmasse 12 fixiert angeordnet ist. Der Haltekörper 10 weist einen zylindrischen Schaft 13 auf, dessen zylindrische Führungsfläche 14 mit der zylindrischen Führungsfläche 15 des Ringkörpers 16 kooperiert. Der Haltekörper 10 weist eine sich in Längsrichtung erstreckende Ausnehmung 17 auf, durch die der Wasserstrahl in Richtung des Pfeiles a austritt. Wie ersichtlich, ist die Durchtrittsöffnung des Düsensteines wesentlich kleiner als der freie Querschnitt dieser Ausnehmung 17. Der Ringkörper 16 weist ein Außengewinde 18 auf, das mit dem Innengewinde 7 kooperiert. Weiter weist der Ringkörper an dem zur freien Oberfläche weisenden Ende der Bohrkrone einen Sechskant 19 auf, welcher zum Angriff eines entsprechenden Imbusschlüssels od. dgl. dient. Im konischen Sitz 9 ist eine ringförmige Nut 20 vorgesehen, in welcher ein Dichtungsring 21 angeordnet ist. Als weitere Bohrwerkzeuge kommen beispielsweise solche mit Bohrrollen, Stiften, korund- oder diamantbesetzte od. dgl. in Frage.In Fig. 3, a recess 6 is shown in the drilling tool body 1, which has an internal thread 7. This recess has an annular extension 8 on its base, which merges into a conical seat 9. The water jet emerges in the direction of arrow a. In the recess 6, the holding body 10 is provided with nozzle block 11, the nozzle block in a cylindrical recess of the holding body, for. B. is fixed by a plastic mass 12. The holding body 10 has a cylindrical shaft 13, the cylindrical guide surface 14 of which cooperates with the cylindrical guide surface 15 of the ring body 16. The holding body 10 has a longitudinally extending recess 17 through which the water jet exits in the direction of arrow a. As can be seen, the passage opening of the nozzle block is substantially smaller than the free cross section of this recess 17. The ring body 16 has an external thread 18 which cooperates with the internal thread 7. Furthermore, the ring body has a hexagon 19 at the end of the drill bit facing the free surface, which is used to attack a corresponding Allen key or the like. In the conical seat 9, an annular groove 20 is provided, in which a sealing ring 21 is arranged. Other drilling tools that can be used are, for example, those with drilling rollers, pins, corundum- or diamond-studded or the like.

Claims (7)

1. A drilling tool, more particularly a drill bit for liquid jet assisted drilling, more particularly rotary drilling, in rock with a drilling tool body (1), which has drilling edges (2), pins, or the like, more particularly constructed using hard metal, with at least one supply (3, 4) for a fluid pressure medium with a pressure between 500 and 4000 bar, which discharges into at least one nozzle (5) detachably disposed in the drilling tool body, characterised in that the nozzle is constructed with a nozzle block (11) and a holding body (10) extending longitudinally in the direction (a) of the jet, the holding body (10) being detachably held via an annular body (16) in a recess (6), more particularly a bore of the drilling tool body (1) and having a cylindrical projection, more particularly a shaft (13), which abuts a cylindrical recess (15) of the annular body, the shaft (13) having a recess (17) extending in the longitudinal extension thereof for the penetration of the clustered liquid jet.
2. A drilling tool according to claim 1, characterised in that the holding body (10) has at least one rotationally symmetrical guide surface (14), which abuts a correspondingly formed guide surface (15) of the annular body (16).
3. A drilling tool acccrding to either of claims 1 and 2, characterised in that the annular body (16) has an outer thread (18), which engages in a corresponding inner thread (7) of the recess (6) in the drilling tool body (1).
4. A drilling tool according to any one of claims 1 to 3, characterised in that the annular body (16) has multiple corners (19), more particularly multiple inner corners.
5. A drilling tool according to any one of claims 1 to 4, characterised in that the recess (6) in the drilling tool body has a conical seat (9) for the holding body (10) of the nozzle block (10).
6. A drilling tool according to any one of claims 1 to 5, characterised in that a sealing ring is provided in an annular groove (20) between the seat (9) in the recess of the drilling tool body and the holding body (10) of the nozzle stone (11).
7. A drilling tool according to claim 6, characterised in that the groove for the sealing ring is provided in the seat (9) of the drilling tool body (1
EP85890130A 1984-06-18 1985-06-14 Drilling tool, especially a drill bit Expired EP0168379B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85890130T ATE35018T1 (en) 1984-06-18 1985-06-14 DRILLING TOOL, ESPECIALLY DRILL BITS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US621867 1984-06-18
US06/621,867 US4611672A (en) 1984-06-18 1984-06-18 Drill bit

Publications (2)

Publication Number Publication Date
EP0168379A1 EP0168379A1 (en) 1986-01-15
EP0168379B1 true EP0168379B1 (en) 1988-06-08

Family

ID=24491990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85890130A Expired EP0168379B1 (en) 1984-06-18 1985-06-14 Drilling tool, especially a drill bit

Country Status (4)

Country Link
US (1) US4611672A (en)
EP (1) EP0168379B1 (en)
AT (1) ATE35018T1 (en)
DE (1) DE3563234D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103429838A (en) * 2011-02-25 2013-12-04 Cmte发展有限公司 Fluid drilling head nozzle design

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4878548A (en) * 1988-01-21 1989-11-07 Eastman Christensen Nozzle retention system for a drill bit
US11235397B2 (en) 2016-12-16 2022-02-01 Kennametal Inc. Side-activated modular drill
US10207337B2 (en) 2017-04-04 2019-02-19 Kennametal Inc. Front-loaded, side-activated modular drill
DE102019116160A1 (en) 2018-06-20 2019-12-24 Kennametal Inc. Modular drill bit closed on the side with spring-assisted ejection
US11090736B2 (en) 2018-12-10 2021-08-17 Kennametal Inc. Side-activated modular drill
US11471952B2 (en) 2020-03-19 2022-10-18 Kennametal Inc. Cutting tool having replaceable cutting head and method of securing a replaceable cutting head
US11883888B2 (en) 2021-06-28 2024-01-30 Kennametal Inc. Modular drill with enhanced bump-off capability
US11708736B1 (en) * 2022-01-31 2023-07-25 Saudi Arabian Oil Company Cutting wellhead gate valve by water jetting

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US2950090A (en) * 1957-08-01 1960-08-23 H C Smith Oil Tool Co Mounting for discharge beans in well drilling bits
US3120284A (en) * 1959-08-17 1964-02-04 Globe Oil Tools Co Jet nozzle for drill bit
US3179189A (en) * 1962-07-30 1965-04-20 Globe Oil Tools Co Bit for drilling wells
US3129777A (en) * 1962-08-07 1964-04-21 Hughes Tool Co Replaceable nozzle having completely shrouded retainer
US3207241A (en) * 1963-04-08 1965-09-21 Smith Tool Co Jet bits
US3389759A (en) * 1966-11-16 1968-06-25 Gulf Research Development Co Retrievable piston advance jet bits
US3645346A (en) * 1970-04-29 1972-02-29 Exxon Production Research Co Erosion drilling
US3688853A (en) * 1971-03-01 1972-09-05 William C Maurer Method and apparatus for replacing nozzles in erosion bits
US3823789A (en) * 1973-05-18 1974-07-16 Smith International Drill bit center jet
US4306627A (en) * 1977-09-22 1981-12-22 Flow Industries, Inc. Fluid jet drilling nozzle and method
US4185706A (en) * 1978-11-17 1980-01-29 Smith International, Inc. Rock bit with cavitating jet nozzles
GB2047571A (en) * 1979-03-02 1980-12-03 Hall & Pickles Ltd A water spray nozzle
US4360069A (en) * 1980-07-21 1982-11-23 Kenneth Davis Diamond drill bits
DE3029963C2 (en) * 1980-08-07 1985-10-17 Flow Industries, Inc., Kent, Wash. Drilling nozzle
US4378853A (en) * 1981-08-31 1983-04-05 Smith International, Inc. Cavitation nozzle plate adapter for rock bits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103429838A (en) * 2011-02-25 2013-12-04 Cmte发展有限公司 Fluid drilling head nozzle design
CN103429838B (en) * 2011-02-25 2016-06-29 Cmte发展有限公司 Fluid drilling head nozzle designs

Also Published As

Publication number Publication date
DE3563234D1 (en) 1988-07-14
ATE35018T1 (en) 1988-06-15
EP0168379A1 (en) 1986-01-15
US4611672A (en) 1986-09-16

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