EP0334806B1 - Rock core bit - Google Patents

Rock core bit Download PDF

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Publication number
EP0334806B1
EP0334806B1 EP89810149A EP89810149A EP0334806B1 EP 0334806 B1 EP0334806 B1 EP 0334806B1 EP 89810149 A EP89810149 A EP 89810149A EP 89810149 A EP89810149 A EP 89810149A EP 0334806 B1 EP0334806 B1 EP 0334806B1
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EP
European Patent Office
Prior art keywords
area
core bit
axially
drill
cutter head
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
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EP89810149A
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German (de)
French (fr)
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EP0334806A1 (en
Inventor
Josef Obermeier
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Hilti AG
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Hilti AG
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Publication date
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Priority to AT89810149T priority Critical patent/ATE95888T1/en
Publication of EP0334806A1 publication Critical patent/EP0334806A1/en
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Publication of EP0334806B1 publication Critical patent/EP0334806B1/en
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    • 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
    • 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
    • E21B10/02—Core bits
    • E21B10/04—Core bits with core destroying means
    • 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
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion

Definitions

  • the invention relates to a rock drilling tool with a drill bit, the drill bit having an area widening in the feed direction in the inner and outer diameter, which is adjoined in the feed direction by a cylindrical area with a constant inner and outer diameter, the end face of which is provided with cutting bodies along the circumference, which project axially and radially beyond the cylindrical area and the drill bit is provided with a centering drill which projects axially beyond it, and has at least one essentially axially extending passage opening for the cuttings which is open to the outer contour.
  • Rock drilling tools known from DE-A-2 856 205 have a shank and a bell-shaped drilling head at the front end.
  • the drill head is provided with cutting pins on its face.
  • the drill head has grooves extending from the circumference, which serve for the passage of the cuttings. After the guide length of this drill head is short, it is not possible to produce precise bores, for example for receiving mechanical anchors. Due to the complex shape, these drilling tools can only be manufactured by forging and subsequent machining, which leads to high manufacturing costs.
  • a bell-like chisel tool can be seen from DE-PS 2 928 445, which is used together with an impact-emitting device.
  • This tool is at least partially tapered on the outside and inside in the feed direction.
  • the front end of the tool in the setting direction is designed as a ring cutter.
  • the tool also has through-openings which are inclined to the longitudinal axis and lead from the inside to the outside and which serve to discharge the cuttings which are broken and crushed by the conical inner shape. Due to the design for purely striking operation, no requirements regarding guidance are made on this tool used for earth drilling.
  • US-A-4,101,238 relates to a carbide-tipped drill bit with a replaceable center drill.
  • the through openings arranged in a central position in the axial direction form suction channels for the drilling dust which arises when the substrate is being worked on.
  • the drill cores in the drill bit must be removed again and again.
  • Tungsten carbide-tipped drill bits have the disadvantage that the cutting edges are subject to different wear towards their outer ends.
  • the manufacture of drill bits designed in this way, as are known from US Pat. No. 4,101,238, is extremely difficult. Due to the large, essentially linear contact surface, the explosive effect of the drill bit caused by the impact is greatly reduced. Due to the large contact surface, the cuttings are crushed more. This unnecessarily dissipates energy that could be used more effectively for drilling progress. The overall drilling progress is reduced.
  • the invention has for its object to provide a rock drilling tool that is economical to manufacture, is suitable for removing cuttings from the inside of the rock drilling tool and for creating deeper holes with a precise geometric shape.
  • this is achieved in that the passage opening essentially extends through the entire length of the region of the drill bit which widens in the inner and outer diameter and in that the cutting bodies are designed in the form of a pin.
  • the core that remains when working on the subsoil is broken when it hits the conical area, so that the resulting cuttings can escape through the through hole from the drill bit and into the area of a transport helix that adjoins the back of the drill bit.
  • Wear-resistant elements can be arranged in the conical overrun area.
  • An annular groove is cut out by the cutting bodies projecting both radially and axially over the cylindrical region when working with the drilling tool according to the invention.
  • the crown body With axially protruding cutting bodies, the crown body hardly comes into direct contact with the surface. On the one hand, this enables good removal of the cuttings and, on the other hand, prevents wear on the crown body.
  • the cutting bodies can protrude radially both outwards and inwards. This enables free cutting and prevents the cylindrical area of the crown body from touching the borehole wall.
  • the cutting bodies are expediently designed in the form of a pin. Such cutting bodies can be accommodated in bores in the drill bit and are therefore precisely positioned, whereby they are also simple to manufacture and can under certain circumstances be replaced by the user himself.
  • the cutting bodies arranged on the end face serve to process the subsurface.
  • the drill bit For the tapping process as well as for the continuation of the bore, the drill bit is provided with a centering drill that projects axially above it. At the start of the drilling process, the center drill comes into contact with the surface. The drill bit then engages on the subsurface. The center drill prevents the drilling tool from running sideways. The center drill is subject to a relatively high degree of wear and should therefore be exchangeable, since the tool is only partially functional in the event of a failure.
  • the shaping proposed according to the invention enables economical production, in particular by extrusion.
  • the decisive factor here is the fact that there are no major jumps in the material thickness. Due to the conical design in connection with the cylindrical area, ideal conditions for an extrusion process are also given from the point of view of the material flow. It also enables better shock transmission.
  • the rock drilling tool shown in FIGS. 1 to 3 essentially consists of a shank 1 which is provided with longitudinal grooves 2 in its rear end region. These longitudinal grooves 2 are used for the axial mounting and the rotary driving of the drilling tool.
  • the shaft 1 is provided with a conical region 3 that widens in the feed direction and has an inner and outer diameter that widens in the feed direction.
  • a cylindrical region 4 adjoins the conical region 3.
  • the length L of this cylindrical region 4 is approximately 0.2 to 3 times the outer diameter D.
  • the front end of the cylindrical region 4 is designed as an annular cutting edge 5.
  • the conical region 3 is provided with through openings 6 which serve to discharge the cuttings formed in the interior of the drill bit.
  • the inside of the drill bit is provided with a receiving bore 7 for a centering drill 8 axially projecting beyond the drill bit.
  • a centering drill 8 axially projecting beyond the drill bit.
  • the drill bit is pin-shaped in the area of the cutting edge 5
  • These cutting bodies 9 are preferably hard metal pins. However, these cutting bodies 9 can also be plate-shaped or consist of synthetic diamonds embedded in a matrix.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The rock drilling tool has a conical area (3) adjoining the shank (1) in the feed direction and a cylindrical area (4) adjoining the conical area (3) in the same direction. The conical area (3) is provided with passage openings (6) which serve to pass the drillings from the inside through to the outside of the core bit. In addition, the core bit has pin-shaped cutting bodies (9) as well as a centre drill (8) projecting axially beyond the core bit. <IMAGE>

Description

Die Erfindung betrifft ein Gesteinsbohrwerkzeug mit Bohrkrone, wobei die Bohrkrone einen sich in Vorschubrichtung im Innen- und Aussendurchmesser erweiternden Bereich aufweist, an den sich in Vorschubrichtung ein zylindrischer Bereich mit konstantem Innen- und Aussendurchmesser anschliesst, dessen Stirnseite entlang des Umfanges mit Schneidkörpern versehen ist, die den zylindrischen Bereich axial und radial überragen und wobei die Bohrkrone mit einem, diese axial überragenden Zentrierbohrer versehen ist, sowie wenigstens eine im wesentlichen axial verlaufende, zur Aussenkontur hin offene Durchtrittsöffnung für das Bohrklein aufweist.The invention relates to a rock drilling tool with a drill bit, the drill bit having an area widening in the feed direction in the inner and outer diameter, which is adjoined in the feed direction by a cylindrical area with a constant inner and outer diameter, the end face of which is provided with cutting bodies along the circumference, which project axially and radially beyond the cylindrical area and the drill bit is provided with a centering drill which projects axially beyond it, and has at least one essentially axially extending passage opening for the cuttings which is open to the outer contour.

Aus der DE-A-2 856 205 bekannte Gesteinsbohrwerkzeuge weisen einen Schaft und am vorderen Ende einen glockenförmig ausgebildeten Bohrkopf auf. Der Bohrkopf ist an seiner Stirnseite mit Schneidstiften versehen. Ausserdem weist der Bohrkopf vom Umfang ausgehende Nuten auf, welche dem Durchtritt des Bohrkleins dienen. Nachdem die Führungslänge dieses Bohrkopfes gering ist, lassen sich genaue Bohrungen, beispielsweise zur Aufnahme von mechanisch zu spreizenden Dübeln, nicht herstellen. Durch die aufwendige Formgebung ist eine Herstellung dieser Bohrwerkzeuge nur durch Schmieden und anschliessende spanabhebende Bearbeitung möglich, was zu hohen Herstellkosten führt.Rock drilling tools known from DE-A-2 856 205 have a shank and a bell-shaped drilling head at the front end. The drill head is provided with cutting pins on its face. In addition, the drill head has grooves extending from the circumference, which serve for the passage of the cuttings. After the guide length of this drill head is short, it is not possible to produce precise bores, for example for receiving mechanical anchors. Due to the complex shape, these drilling tools can only be manufactured by forging and subsequent machining, which leads to high manufacturing costs.

Aus der DE-A-3 049 135 sind weitere Gesteinsbohrwerkzeuge bekannt, deren Aussendurchmesser vom Schaft her in Vorschubrichtung konisch zunimmt. Wie die DE-A-3 049 135 weisen auch die aus den bekannten Druckschriften AT-A-360 734 und US-A-2 334 453 Bohrwerkzeuge in Form einer wenigstens teilweise geschlossenen Glocke auf. Die Bohrtiefe dieser Bohrwerkzeuge ist dadurch begrenzt. Falls mit diesen Bohrwerkzeugen Durchbrüche in Wänden mit grösserer Wandstärke hergestellt werden sollen, so muss dies in mehreren Etappen erfolgen, weil jeweils nach einer Etappe der Bohrkern entfernt werden muss. Die Entleerungslöcher der AT-A-360 734 und der US-A-2 334 453 dienen der Enthiftung des Hohlraumes in der Glocke und dem Abtransport des abgebauten Gesteins.From DE-A-3 049 135 further rock drilling tools are known, the outside diameter of which increases conically from the shank in the direction of advance. Like DE-A-3 049 135, the drilling tools from the known publications AT-A-360 734 and US-A-2 334 453 also have drilling tools in the form of an at least partially closed bell. This limits the drilling depth of these drilling tools. If breakthroughs in walls of greater wall thickness are to be made with these drilling tools, this must be done in several stages, because the core must be removed after each stage. The drain holes of AT-A-360 734 and US-A-2 334 453 are used to detoxify the cavity in the bell and to remove the extracted rock.

Neben diesen bekannten Gesteinsbohrwerkzeugen ist aus der DE-PS 2 928 445 ein glockenartiges Meisselwerkzeug ersichtlich, das zusammen mit einem Schläge abgebenden Gerät verwendet wird. Dieses Werkzeug ist an seiner Aussen- und Innenseite zumindest teilweise in Vorschubrichtung konisch erweitert. Das in Setzrichtung vordere Ende des Werkzeuges ist als Ringschneide ausgebildet. Das Werkzeug weist ferner zur Längsachse geneigt angeordnete, von der Innen- zur Aussenseite führende Durchtrittsöffnungen auf, die der Abfuhr des Bohrkleins dienen, das durch die konische Innenform gebrochen und zerkleinert wird. Durch die Auslegung auf rein schlagenden Betrieb werden an dieses zum Erdbohren verwendete Werkzeug keine Anforderungen hinsichtlich Führung gestellt.In addition to these known rock drilling tools, a bell-like chisel tool can be seen from DE-PS 2 928 445, which is used together with an impact-emitting device. This tool is at least partially tapered on the outside and inside in the feed direction. The front end of the tool in the setting direction is designed as a ring cutter. The tool also has through-openings which are inclined to the longitudinal axis and lead from the inside to the outside and which serve to discharge the cuttings which are broken and crushed by the conical inner shape. Due to the design for purely striking operation, no requirements regarding guidance are made on this tool used for earth drilling.

Die US-A-4,101,238 betrifft eine hartmetallbestückte Bohrkrone mit auswechselbarem Zentrierbohrer. Die in zentraler Lage in axialer Richtung angeordneten Durchtrittsöffnungen bilden Absaugkanäle für den beim Bearbeiten des Untergrundes entstehenden Bohrstaub. Bei der Erstellung von Bohrungen in Wänden mit grösserer Wandstärke müssen die sich in der Bohrkrone befindlichen Bohrkerne immer wieder entfernt werden.US-A-4,101,238 relates to a carbide-tipped drill bit with a replaceable center drill. The through openings arranged in a central position in the axial direction form suction channels for the drilling dust which arises when the substrate is being worked on. When drilling holes in walls with a larger wall thickness, the drill cores in the drill bit must be removed again and again.

Hartmetallbestückte Bohrkronen weisen den Nachteil auf, dass die Schneiden nach ihren äusseren Enden hin einem unterschiedlichen Verschleiss unterworfen sind. Die Fertigung derart ausgebildeter Bohrkronen, wie sie aus der US-A-4 101 238 bekannt sind, ist ausserordentlich schwierig. Durch die infolge der grossen, im wesentlichen linienförmigen Auflagefläche wird die durch die Schlagwirkung hervorgerufene Sprengwirkung der Bohrkrone stark herabgesetzt. Durch die grosse Auflagefläche wird das Bohrklein stärker zerkleinert. Dadurch wird unnützerweise Energie abgebaut, die für den Bohrfortschritt sinnvoller genützt werden könnte. Der allgemeine Bohrfortschritt wird dadurch geringer.Tungsten carbide-tipped drill bits have the disadvantage that the cutting edges are subject to different wear towards their outer ends. The manufacture of drill bits designed in this way, as are known from US Pat. No. 4,101,238, is extremely difficult. Due to the large, essentially linear contact surface, the explosive effect of the drill bit caused by the impact is greatly reduced. Due to the large contact surface, the cuttings are crushed more. This unnecessarily dissipates energy that could be used more effectively for drilling progress. The overall drilling progress is reduced.

Der Erfindung liegt die Aufgabe zugrunde, ein Gesteinsbohrwerkzeug zu schaffen, das sich wirtschaftlich herstellen lässt, zur Abfuhr von Bohrklein aus dem Inneren des Gesteinsbohrwerkzeuges und zur Schaffung tieferer Bohrlöcher mit genauer geometrischer Form geeignet ist.The invention has for its object to provide a rock drilling tool that is economical to manufacture, is suitable for removing cuttings from the inside of the rock drilling tool and for creating deeper holes with a precise geometric shape.

Gemäss der Erfindung wird dies dadurch erreicht, dass die Durchtrittsöffnung im wesentlichen die gesamte Länge des den sich im Innen- und Aussendurchmesser erweiternden Bereiches der Bohrkrone durchsetzt und dass die Schneidkörper stiftförmig ausgebildet sind.According to the invention, this is achieved in that the passage opening essentially extends through the entire length of the region of the drill bit which widens in the inner and outer diameter and in that the cutting bodies are designed in the form of a pin.

Der beim Bearbeiten des Untergrundes stehenbleibende Kern wird beim Auflaufen auf den konischen Bereich gebrochen, so dass das entstehende Bohrklein durch die Durchtrittsöffnung aus der Bohrkrone entweichen kann und in den Bereich einer gegebenenfalls sich rückseitig an die Bohrkrone anschliessenden Transportwendel gelangt. Im konischen Auflaufbereich können verschleissfeste Elemente angeordnet werden.The core that remains when working on the subsoil is broken when it hits the conical area, so that the resulting cuttings can escape through the through hole from the drill bit and into the area of a transport helix that adjoins the back of the drill bit. Wear-resistant elements can be arranged in the conical overrun area.

Durch die den zylindrischen Bereich sowohl radial als auch axial überragenden Schneidkörper wird beim Arbeiten mit dem erfindungsgemässen Bohrwerkzeug eine Ringnut herausgeschnitten. Der Kronenkörper kommt bei axial überragenden Schneidkörpern kaum in direkte Berührung mit dem Untergrund. Dies ermöglicht einerseits eine gute Abfuhr des Bohrkleins und verhindert andererseits einen Verschleiss des Kronenkörpers. Das radial Überragen der Schneidkörper kann sowohl nach aussen als auch nach innen erfolgen. Dies ermöglicht ein Freischneiden und verhindert eine Berührung des zylindrischen Bereiches des Kronenkörpers mit der Bohrlochwandung.An annular groove is cut out by the cutting bodies projecting both radially and axially over the cylindrical region when working with the drilling tool according to the invention. With axially protruding cutting bodies, the crown body hardly comes into direct contact with the surface. On the one hand, this enables good removal of the cuttings and, on the other hand, prevents wear on the crown body. The cutting bodies can protrude radially both outwards and inwards. This enables free cutting and prevents the cylindrical area of the crown body from touching the borehole wall.

Zweckmässigerweise sind die Schneidkörper stiftförmig ausgebildet. Solche Schneidkörper können in Bohrungen der Bohrkrone aufgenommen werden und sind dadurch in der Lage genau positioniert, wobei sie zudem in der Herstellung einfach sind und unter Umständen vom Anwender selbst ausgewechselt werden können.The cutting bodies are expediently designed in the form of a pin. Such cutting bodies can be accommodated in bores in the drill bit and are therefore precisely positioned, whereby they are also simple to manufacture and can under certain circumstances be replaced by the user himself.

Der sich in Vorschubrichtung an den Bereich mit sich erweiterndem Innen- und Aussendurchmesser anschliessende zylindrische Bereich schafft eine gute Führung des Bohrwerkzeuges im Bohrloch. Die an der Stirnseite angeordneten Schneidkörper dienen dem Bearbeiten des Untergrundes.The cylindrical area adjoining the area with a widening inside and outside diameter in the feed direction creates a good guidance of the drilling tool in the borehole. The cutting bodies arranged on the end face serve to process the subsurface.

Für den Anbohrvorgang sowie auch für das Weiterführen der Bohrung ist die Bohrkrone mit einem, diese axial überragenden Zentrierbohrer versehen. Zu Beginn des Bohrvorganges kommt zuerst der Zentrierbohrer mit dem Untergrund in Berührung. Anschliessend gelangt die Bohrkrone am Untergrund in Eingriff. Durch den Zentrierbohrer wird ein seitliches Verlaufen des Bohrwerkzeugs verhindert. Der Zentrierbohrer ist einem relativ hohen Verschleiss unterworfen und sollte daher auswechselbar sein, da das Werkzeug bei einem Ausfall nur noch bedingt funktionstüchtig ist.For the tapping process as well as for the continuation of the bore, the drill bit is provided with a centering drill that projects axially above it. At the start of the drilling process, the center drill comes into contact with the surface. The drill bit then engages on the subsurface. The center drill prevents the drilling tool from running sideways. The center drill is subject to a relatively high degree of wear and should therefore be exchangeable, since the tool is only partially functional in the event of a failure.

Die erfindungsgemäss vorgeschlagene Formgebung ermöglicht eine wirtschaftliche Herstellung, insbesondere durch Fliesspressen. Massgebend hierzu ist vor allem der Umstand, dass keine grossen Sprünge in den Materialstärken vorhanden sind. Durch die kegelartige Ausbildung in Verbindung mit dem zylindrischen Bereich sind zudem aus der Sicht des Materialflusses ideale Voraussetzungen für ein Fliesspressverfahren gegeben. Ausserdem wird dadurch eine bessere Stossübertragung ermöglicht.The shaping proposed according to the invention enables economical production, in particular by extrusion. The decisive factor here is the fact that there are no major jumps in the material thickness. Due to the conical design in connection with the cylindrical area, ideal conditions for an extrusion process are also given from the point of view of the material flow. It also enables better shock transmission.

Die Erfindung soll nachstehend anhand der sie beispielsweise wiedergebenden Zeichnungen näher erläutert werden. Es zeigen:

Fig. 1
ein erfindungsgemässes Gesteinsbohrwerkzeug, teilweise im Schnitt dargestellt;
Fig. 2
eine Ansicht des in Fig. 1 dargestellten Gesteinsbohrwerkzeuges, in Richtung des Pfeiles A;
Fig. 3
eine Ansicht des in Fig. 1 dargestellten Gesteinsbohrwerkzeuges, in Richtung des Pfeiles B.
The invention will be explained in more detail below with reference to the drawings, for example. Show it:
Fig. 1
a rock drilling tool according to the invention, partially shown in section;
Fig. 2
a view of the rock drilling tool shown in Figure 1, in the direction of arrow A;
Fig. 3
a view of the rock drilling tool shown in Fig. 1, in the direction of arrow B.

Das aus Fig. 1 bis 3 ersichtliche Gesteinsbohrwerkzeug besteht im wesentlichen aus einem Schaft 1, der in seinem rückwärtigen Endbereich mit Längsnuten 2 versehen ist. Diese Längsnuten 2 dienen der axialen Halterung und der Drehmitnahme des Bohrwerkzeuges. Der Schaft 1 ist mit einem sich in Vorschubrichtung erweiternden, konischen Bereich 3 mit sich in Vorschubrichtung erweiterndem Innen- und Aussendurchmesser versehen. An den konischen Bereich 3 schliesst sich ein zylindrischer Bereich 4 an. Die Länge L dieses zylindrischen Bereiches 4 beträgt etwa das 0,2- bis 3-fache des Aussendurchmessers D. Das vordere Ende des zylindrischen Bereiches 4 ist als ringförmige Schneidkante 5 ausgebildet. Der konische Bereich 3 ist mit Durchtrittsöffnungen 6 versehen, welche der Abfuhr des sich im Innern der Bohrkrone bildenden Bohrkleins dienen. Die Bohrkrone ist an ihrer Innenseite mit einer Aufnahmebohrung 7 für einen die Bohrkrone axial überragenden Zentrierbohrer 8 versehen. Zu Beginn des Anbohrvorganges kommt zunächst nur der Zentrierbohrer 8 mit der Oberfläche des zu bearbeitenden Untergrundes in Eingriff. Die Bohrkrone ist im Bereich des Schneidkante 5 mit stiftförmigen Schneidkörpern 9 versehen. Bei diesen Schneidkörpern 9 handelt es sich vorzugsweise um Hartmetallstifte. Diese Schneidkörper 9 können jedoch auch plattenförmig ausgebildet oder aus synthetischen, in eine Matrix eingebetteten Diamanten bestehen.The rock drilling tool shown in FIGS. 1 to 3 essentially consists of a shank 1 which is provided with longitudinal grooves 2 in its rear end region. These longitudinal grooves 2 are used for the axial mounting and the rotary driving of the drilling tool. The shaft 1 is provided with a conical region 3 that widens in the feed direction and has an inner and outer diameter that widens in the feed direction. A cylindrical region 4 adjoins the conical region 3. The length L of this cylindrical region 4 is approximately 0.2 to 3 times the outer diameter D. The front end of the cylindrical region 4 is designed as an annular cutting edge 5. The conical region 3 is provided with through openings 6 which serve to discharge the cuttings formed in the interior of the drill bit. The inside of the drill bit is provided with a receiving bore 7 for a centering drill 8 axially projecting beyond the drill bit. At the beginning of the drilling process, only the center drill 8 comes into engagement with the surface of the substrate to be machined. The drill bit is pin-shaped in the area of the cutting edge 5 Provide cutting bodies 9. These cutting bodies 9 are preferably hard metal pins. However, these cutting bodies 9 can also be plate-shaped or consist of synthetic diamonds embedded in a matrix.

Claims (1)

  1. Rock drilling tool with cutter head, wherein the cutter head comprises an area (3) the inside and outside diameter of which widens in the feed direction and which is adjoined in the feed direction by a cylindrical area (4) of constant inside and outside diameter, the end surface of which is provided along its periphery with cutting elements (9) which axially and radially protrude over the cylindrical area, and wherein the cutter head is provided with a centring cutter (8) which axially extends beyond the latter, and comprising at least one passage (6) for the drilling waste, which extends substantially axially and is open towards the outside contour, characterised in that the passage (6) passes substantially through the entire length of the area of the cutter head the inside and outside diameter of which widens, and that the cutting elements (9) are pinshaped.
EP89810149A 1988-03-21 1989-02-27 Rock core bit Expired - Lifetime EP0334806B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89810149T ATE95888T1 (en) 1988-03-21 1989-02-27 ROCK DRILL BITS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3809428 1988-03-21
DE3809428A DE3809428A1 (en) 1988-03-21 1988-03-21 STONE DRILL BIT

Publications (2)

Publication Number Publication Date
EP0334806A1 EP0334806A1 (en) 1989-09-27
EP0334806B1 true EP0334806B1 (en) 1993-10-13

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EP89810149A Expired - Lifetime EP0334806B1 (en) 1988-03-21 1989-02-27 Rock core bit

Country Status (5)

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EP (1) EP0334806B1 (en)
JP (1) JPH01284690A (en)
AT (1) ATE95888T1 (en)
DE (2) DE3809428A1 (en)
DK (1) DK125989A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN102134850A (en) * 2011-01-08 2011-07-27 洪子云 Soil-sucking hole-forming bit of diamond drill
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Also Published As

Publication number Publication date
EP0334806A1 (en) 1989-09-27
DE3809428A1 (en) 1989-10-12
DK125989D0 (en) 1989-03-15
DE58905867D1 (en) 1993-11-18
JPH01284690A (en) 1989-11-15
DK125989A (en) 1989-09-22
ATE95888T1 (en) 1993-10-15

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