EP0378964A2 - Trepanning tool - Google Patents

Trepanning tool Download PDF

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Publication number
EP0378964A2
EP0378964A2 EP89810661A EP89810661A EP0378964A2 EP 0378964 A2 EP0378964 A2 EP 0378964A2 EP 89810661 A EP89810661 A EP 89810661A EP 89810661 A EP89810661 A EP 89810661A EP 0378964 A2 EP0378964 A2 EP 0378964A2
Authority
EP
European Patent Office
Prior art keywords
segments
drilling tool
carrier part
hollow drilling
cutting bodies
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.)
Granted
Application number
EP89810661A
Other languages
German (de)
French (fr)
Other versions
EP0378964A3 (en
EP0378964B1 (en
Inventor
Josef Obermeier
Ernst Wohlwend
Eugen Dr. Magyari
Horst-Detlef Gassmann
Walter Ritt
Peter Cavada
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
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to AT89810661T priority Critical patent/ATE91933T1/en
Publication of EP0378964A2 publication Critical patent/EP0378964A2/en
Publication of EP0378964A3 publication Critical patent/EP0378964A3/en
Application granted granted Critical
Publication of EP0378964B1 publication Critical patent/EP0378964B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/78—Tool of specific diverse material
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/81—Tool having crystalline cutting edge
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/895—Having axial, core-receiving central portion
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/896—Having product-receiving chamber

Definitions

  • the invention relates to a hollow drilling tool with a tubular carrier part and cutting bodies arranged at the front end thereof.
  • Hollow boring tools are mainly used for drilling larger diameter bores.
  • a hollow drilling tool is known for example from GB-PS 935 030.
  • the ring-shaped cutting body is connected to the carrier part.
  • the radial guidance of this hollow drilling tool takes place exclusively via the cutting body.
  • the guide length becomes shorter. If the guide length is too small, an exact borehole geometry can no longer be guaranteed.
  • the invention has for its object to provide a hollow drilling tool that allows full use of the cutting body and compliance with an accurate hole geometry.
  • this is achieved by the fact that guide elements are arranged towards the carrier part opposite to the feed direction, the outer contour of which corresponds to the cutting body along at least part of the circumference of the outer contour, the guide elements have a higher wear resistance than the carrier part and the axial extent of the Guide elements corresponds at least to the axial extent of the cutting body.
  • the two functions "cutting” and “guiding” are separated from one another by the arrangement of guide elements. Since the outer contour of the guide elements at least along one Part of the circumference corresponds to the outer contour of the cutting bodies, the guide elements are guided in the bore previously made by the cutting bodies. Since the guide elements have a higher wear resistance than the carrier part, premature wear of the guide elements is prevented. Because the axial extent of the guide elements corresponds at least to the axial extent of the cutting bodies, adequate guidance of the hollow drilling tool in the borehole is ensured over the entire service life of the cutting bodies.
  • the guide elements are expediently designed as segments. Segments each extend over part of the circumference. If the circumferential extent of the segments is sufficiently small and the outside diameter of the hollow drilling tool is sufficiently large, the segments can also be designed as flat strips that extend in the axial direction.
  • At least three segments distributed along the circumference are preferably provided.
  • the central position of the hollow drilling tool in a hole is determined using three segments. However, more than three, for example four or six, segments can also be provided for a favorable distribution of the lateral forces.
  • the segments are expediently arranged adjacent to the cutting bodies in an extension against the feed direction.
  • the cutting bodies are thus supported in the axial direction on the segments and these in turn on the carrier part.
  • the segments and the cutting bodies can each be produced individually and then connected to one another, for example by soldering. Because the cutting body preferred consists of synthetic diamonds embedded in a metal matrix, the cutting bodies and the segments can also be pre-sintered individually and then sintered together to form a single body.
  • the segments are advantageously arranged in corresponding recesses in the carrier body.
  • the segments are thus surrounded on three sides by the carrier part. Such a positive connection of the segments to the carrier part prevents the segments from breaking out even under extreme conditions.
  • the segments are expediently part of a carrier arranged between the carrier part and the cutting bodies.
  • the carrier can thus be manufactured separately and then connected to the carrier part at one end and to the cutting bodies at the other end. This enables rational and economical production.
  • the carrier can, for example, be provided with grooves running in the axial direction, so that strips serving to guide the hollow drilling tool are produced between the individual grooves. Such grooves are also used for the good removal of the cooling water and the cuttings washed away with it.
  • the carrier can also be pre-sintered and then connected to the cutting bodies.
  • the guide elements advantageously contain wear-resistant hard materials.
  • Such hard materials are, for example, silicon carbide or the like. These hard materials can be sintered into a matrix material.
  • the carrier part 1 consists of a tubular carrier part 1, a ring-shaped cutting body 2 and a likewise ring-shaped carrier 3.
  • the carrier part 1 has a front end 1a and a rear end 1b. At the rear end 1b, the carrier part 1 is provided with a connecting piece 1c.
  • the cutting body 2 also has a front end 2a and a rear end 2b.
  • the cutting body 2 is also provided with two diametrically opposed slots 2c extending from the front end 2a. These slots 2c serve for the passage of the cooling water supplied through the carrier part 1 from the inside to the outside of the hollow drilling tool.
  • the carrier 3 has a front end 3a and a rear end 3b. The front end 3a of the carrier 3 is connected to the rear end 2b of the cutting body 2.
  • the carrier 3 is provided along its circumference with grooves 3c running in the axial direction. These grooves 3c serve to discharge the cooling water and the cuttings washed away with it. The webs remaining between the grooves 3c are used for guidance and are designed as segments 3d forms.
  • the rear end 3b of the carrier 3 is connected to the front end 1a of the carrier part 1. This connection of the carrier part 1 to the carrier 3 can take place, for example, by welding or soldering.
  • the connection between the cutting body 2 and the carrier 3 can also be made by welding or soldering. In addition, it is possible to sinter the cutting body 2 and the carrier 3 together.
  • the axial extent 1 of the carrier 3 is a multiple of the axial extent s of the cutting body 2.
  • the hollow drilling tool shown in FIG. 3 consists of a carrier part 11 and on its front end 11a arranged cutting bodies 12 and the guiding segments 13.
  • the segments 13 are located between the carrier part 11 and the cutting bodies 12 and correspond in cross section to the cutting bodies 12.
  • Die Cutting body 12 and the segments 13 can be connected to one another by sintering, soldering or welding.
  • the segments 13 are connected to the carrier part 11 by welding or soldering.
  • the carrier part 11 and the segments 13 are connected to one another only at the end. Due to the gaps between the segments 13, the cooling water can circulate from the inside to the outside of the tubular support part 11.
  • the axial extent t of the segments 13 corresponds approximately to the axial extent s of the cutting bodies 12. This ensures that the guidance is sufficient until the cutting bodies 12 are completely worn out.
  • the hollow drilling tool shown in FIG. 4 consists of a carrier part 21 and cutting bodies 22 and segments 23 arranged at its front end 21a.
  • the cutting bodies 22 and the segments 23 are arranged in recesses 21b of the carrier part 21.
  • the axial extent m of the segments 23 is approximately twice the axial extent s of the cutting bodies 22. This ensures good guidance of the hollow drill tool ensured even with almost completely worn cutting bodies 22.
  • the segments 23 are completely embedded in the carrier part 21.
  • the cutting bodies 22 are connected to the segments 23.
  • the carrier part 21 has openings 21c between the individual cutting bodies 22. These openings 21c serve for the passage of the cooling water from the inside to the outside of the carrier part 21.
  • the hollow drilling tool shown in FIG. 5 consists of a carrier part 31 and cutting bodies 32 arranged at its front end 31a and segments 33 serving as guides.
  • the segments 33 and the cutting bodies 32 are completely embedded in recesses 31b of the carrier part 31.
  • the axial extent n of the segments 33 is approximately three times the axial extent s of the cutting bodies 32. This results in a particularly long guide length and thus enables very precise bores to be produced.
  • the carrier part 31 is provided with slots 31c between the cutting bodies 32. These slots serve for the passage of the cooling water.
  • the cutting bodies 32 and the segments 33 can in turn be connected to one another by welding, soldering or sintering.
  • the segments 33 are connected to the carrier part 31 by soldering or welding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Surgical Instruments (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Dowels (AREA)

Abstract

The trepanning tool, consisting of a support part (1) and a cutting body (2), has guide segments (3d) following the cutting body (2) towards the support part (1) in the opposite direction to the feed direction. The outer contour of the segments (3d) essentially corresponds to the outer contour of the cutting body (2). The segments (3d) serve to guide the trepanning tool in the bore produced by the cutting body (2). <IMAGE>

Description

Die Erfindung betrifft ein Hohlbohrwerkzeug mit einem rohr­förmigen Trägerteil und an dessen vorderem Ende angeordne­ten Schneidkörpern.The invention relates to a hollow drilling tool with a tubular carrier part and cutting bodies arranged at the front end thereof.

Hohlbohrwerkzeuge werden hauptsächlich zum Herstellen von Bohrungen mit grösserem Durchmesser verwendet. Ein solches Hohlbohrwerkzeug ist beispielsweise aus der GB-PS 935 030 bekannt. Bei diesem Hohlbohrwerkzeug ist der ringförmig ausgebildete Schneidkörper mit dem Trägerteil verbunden. Die radiale Führung dieses Hohlbohrwerkzeuges erfolgt ausschliess­lich über den Schneidkörper. Da sich der Schneidkörper mit der Zeit abnutzt, wird die Führungslänge kürzer. Ist die Führungslänge zu klein, ist eine genaue Bohrlochgeometrie nicht mehr gewährleistet.Hollow boring tools are mainly used for drilling larger diameter bores. Such a hollow drilling tool is known for example from GB-PS 935 030. In this hollow drilling tool, the ring-shaped cutting body is connected to the carrier part. The radial guidance of this hollow drilling tool takes place exclusively via the cutting body. As the cutting body wears out over time, the guide length becomes shorter. If the guide length is too small, an exact borehole geometry can no longer be guaranteed.

Der Erfindung liegt die Aufgabe zugrunde, ein Hohlbohrwerk­zeug zu schaffen, das eine vollständige Ausnutzung der Schneidkörper und die Einhaltung einer genauen Bohrlochgeo­metrie ermöglicht.The invention has for its object to provide a hollow drilling tool that allows full use of the cutting body and compliance with an accurate hole geometry.

Gemäss der Erfindung wird dies dadurch erreicht, dass zum Trägerteil hin entgegen der Vorschubrichtung anschliessend an die Schneidkörper Führungselemente angeordnet sind, deren Aussenkontur wenigstens entlang eines Teils des Umfanges der Aussenkontur der Schneidkörper entspricht, die Führungselemente gegenüber dem Trägerteil eine höhere Ver­schleissfestigkeit aufweisen und die Axialerstreckung der Führungselemente mindestens der Axialerstreckung der Schneidkörper entspricht.According to the invention, this is achieved by the fact that guide elements are arranged towards the carrier part opposite to the feed direction, the outer contour of which corresponds to the cutting body along at least part of the circumference of the outer contour, the guide elements have a higher wear resistance than the carrier part and the axial extent of the Guide elements corresponds at least to the axial extent of the cutting body.

Durch die Anordnung von Führungselementen werden die beiden Funktionen "Schneiden" und "Führen" voneinander getrennt. Da die Aussenkontur der Führungselemente wenigstens entlang eines Teils des Umfanges der Aussenkontur der Schneidkörper ent­spricht, werden die Führungselemente in der zuvor von den Schneidkörpern erstellten Bohrung geführt. Da die Führungs­elemente gegenüber dem Trägerteil eine höhere Verschleiss­festigkeit aufweisen, wird eine vorzeitige Abnützung der Führungselemente verhindert. Dadurch, dass die Axialer­streckung der Führungselemente mindestens der Axialer­streckung der Schneidkörper entspricht, ist über die gesamte Lebensdauer der Schneidkörper eine ausreichende Führung des Hohlbohrwerkzeuges im Bohrloch gewährleistet.The two functions "cutting" and "guiding" are separated from one another by the arrangement of guide elements. Since the outer contour of the guide elements at least along one Part of the circumference corresponds to the outer contour of the cutting bodies, the guide elements are guided in the bore previously made by the cutting bodies. Since the guide elements have a higher wear resistance than the carrier part, premature wear of the guide elements is prevented. Because the axial extent of the guide elements corresponds at least to the axial extent of the cutting bodies, adequate guidance of the hollow drilling tool in the borehole is ensured over the entire service life of the cutting bodies.

Die Führungselemente sind zweckmässig als Segmente aus­gebildet. Segmente erstrecken sich jeweils über einen Teil des Umfanges. Ist die Umfangserstreckung der Seg­mente genügend klein und der Aussendurchmesser des Hohl­bohrwerkzeuges genügend gross, so können die Segmente auch als sich in axialer Richtung erstreckende, ebene Leisten ausgebildet werden.The guide elements are expediently designed as segments. Segments each extend over part of the circumference. If the circumferential extent of the segments is sufficiently small and the outside diameter of the hollow drilling tool is sufficiently large, the segments can also be designed as flat strips that extend in the axial direction.

Vorzugsweise sind wenigstens drei, entlang dem Umfang ver­teilte Segmente vorgesehen. Mittels dreier Segmente wird die zentrische Lage des Hohlbohrwerkzeuges in einer Bohrung be­stimmt. Für eine günstige Verteilung der seitlichen Kräfte können jedoch auch mehr als drei, beispielsweise vier oder sechs Segmente vorgesehen werden.At least three segments distributed along the circumference are preferably provided. The central position of the hollow drilling tool in a hole is determined using three segments. However, more than three, for example four or six, segments can also be provided for a favorable distribution of the lateral forces.

Die Segmente sind zweckmässigerweise entgegen der Vorschub­richtung in Verlängerung anschliessend an die Schneidkörper angeordnet. Die Schneidkörper stützen sich somit in axialer Richtung an den Segmenten und diese wiederum am Trägerteil ab. Die Segmente und die Schneidkörper können je einzeln hergestellt und anschliessend beispielsweise durch Verlöten miteinander verbunden werden. Da die Schneidkörper vorzugs­ weise aus in eine Metallmatrix eingebetteten synthetischen Diamanten besteht, können die Schneidkörper und die Segmente auch einzeln vorgesintert und anschliessend zu einem einzi­gen Körper zusammengesintert werden.The segments are expediently arranged adjacent to the cutting bodies in an extension against the feed direction. The cutting bodies are thus supported in the axial direction on the segments and these in turn on the carrier part. The segments and the cutting bodies can each be produced individually and then connected to one another, for example by soldering. Because the cutting body preferred consists of synthetic diamonds embedded in a metal matrix, the cutting bodies and the segments can also be pre-sintered individually and then sintered together to form a single body.

Die Segmente sind vorteilhaft in entsprechenden Ausnehmungen des Trägerkörpers angeordnet. Die Segmente werden somit auf drei Seiten vom Trägerteil umgeben. Durch eine solche form­schlüssige Verbindung der Segmente mit dem Trägerteil wird auch bei extremen Bedingungen ein Herausbrechen der Segmente verhindert.The segments are advantageously arranged in corresponding recesses in the carrier body. The segments are thus surrounded on three sides by the carrier part. Such a positive connection of the segments to the carrier part prevents the segments from breaking out even under extreme conditions.

Die Segmente sind zweckmässigerweise Teil eines zwischen dem Trägerteil und den Schneidkörpern angeordneten Trägers. Der Träger kann somit separat hergestellt und anschliessend am einen Ende mit dem Trägerteil und am anderen Ende mit den Schneidkörpern verbunden werden. Dies ermöglicht eine ratio­nelle und wirtschaftliche Herstellung. Der Träger kann bei­spielsweise mit in axialer Richtung verlaufenden Nuten ver­sehen werden, so dass zwischen den einzelnen Nuten der Füh­rung des Hohlbohrwerkzeuges dienende Leisten entstehen. Sol­che Nuten dienen auch der guten Abfuhr des Kühlwassers und des damit weggespülten Bohrkleins. Der Träger kann jedoch auch vorgesintert und anschliessend mit den Schneidkörpern verbunden werden.The segments are expediently part of a carrier arranged between the carrier part and the cutting bodies. The carrier can thus be manufactured separately and then connected to the carrier part at one end and to the cutting bodies at the other end. This enables rational and economical production. The carrier can, for example, be provided with grooves running in the axial direction, so that strips serving to guide the hollow drilling tool are produced between the individual grooves. Such grooves are also used for the good removal of the cooling water and the cuttings washed away with it. However, the carrier can also be pre-sintered and then connected to the cutting bodies.

Die Führungselemente enthalten vorteilhaft verschleissfeste Hartstoffe. Solche Hartstoffe sind beispielsweise Silizium­carbid oder dergleichen. Diese Hartstoffe können in ein Ma­trixmaterial eingesintert werden.The guide elements advantageously contain wear-resistant hard materials. Such hard materials are, for example, silicon carbide or the like. These hard materials can be sintered into a matrix material.

Die Erfindung soll nachstehend, anhand der anliegenden Zeich­nungen, näher erläutert werden. Es zeigen:

  • Fig. 1 ein erfindungsgemässes Hohlbohrwerkzeug, perspektivisch,
  • Fig. 2 das Hohlbohrwerkzeug gemäss Fig. 1, teilweise im Schnitt dargestellt,
  • Fig. 3 einen Teil eines weiteren erfindungsgemässen Hohlbohrwerkzeuges, in Ansicht,
  • Fig. 4 eine weitere Ausführung eines erfindungsgemäs­sen Hohlbohrwerkzeuges, in Ansicht,
  • Fig 5 ein Hohlbohrwerkzeug gemäss einer weiteren er­findungsgemässen Ausbildung.
The invention will be explained in more detail below with reference to the accompanying drawings. Show it:
  • 1 shows a hollow drilling tool according to the invention, in perspective,
  • 2 shows the hollow drilling tool according to FIG. 1, partially in section,
  • 3 shows a part of a further hollow drilling tool according to the invention, in view,
  • 4 shows a further embodiment of a hollow drilling tool according to the invention, in view,
  • 5 shows a hollow drilling tool according to a further embodiment according to the invention.

Das aus Fig. 1 und 2 ersichtliche Hohlbohrwerkzeug besteht aus einem rohrförmigen Trägerteil 1, einem ringförmig ausge­bildeten Schneidkörper 2 und einem ebenfalls ringförmig aus­gebildeten Träger 3. Das Trägerteil 1 weist ein vorderes Ende 1a und ein rückwärtiges Ende 1b auf. Am rückwärtigen Ende 1b ist das Trägerteil 1 mit einem Anschlussstutzen 1c versehen. Der Schneidkörper 2 weist ebenfalls ein vorderes Ende 2a und ein rückwärtiges Ende 2b auf. Der Schneidkörper 2 ist ausser­dem mit zwei einander diametral gegenüberliegend angeordne­ten, vom vorderen Ende 2a ausgehenden Schlitzen 2c versehen. Diese Schlitze 2c dienen dem Durchtritt des durch das Träger­teil 1 zugeführten Kühlwassers von der Innenseite zur Aussen­seite des Hohlbohrwerkzeuges. Der Träger 3 weist ein vorderes Ende 3a und ein rückwärtiges Ende 3b auf. Das vordere Ende 3a des Trägers 3 ist mit dem rückwärtigen Ende 2b des Schneid­körpers 2 verbunden. Der Träger 3 ist entlang seines Umfanges mit in axialer Richtung verlaufenden Nuten 3c versehen. Diese Nuten 3c dienen der Abfuhr des Kühlwassers und des damit weggespülten Bohrkleins. Die zwischen den Nuten 3c verbleiben­den Stege dienen der Führung und sind als Segmente 3d ausge­ bildet. Das rückwärtige Ende 3b des Trägers 3 ist mit dem vorderen Ende 1a des Trägerteils 1 verbunden. Dieses Verbin­den des Trägerteils 1 mit dem Träger 3 kann beispielsweise durch Schweissen oder Löten erfolgen. Die Verbindung zwischen dem Schneidkörper 2 und dem Träger 3 kann ebenfalls durch Schweissen oder Löten erfolgen. Ausserdem ist es möglich, den Schneidkörper 2 und den Träger 3 zusammenzusintern. Die axiale Erstreckung 1 des Trägers 3 begträgt ein Mehrfaches der axialen Erstreckung s des Schneidkörpers 2.1 and 2 consists of a tubular carrier part 1, a ring-shaped cutting body 2 and a likewise ring-shaped carrier 3. The carrier part 1 has a front end 1a and a rear end 1b. At the rear end 1b, the carrier part 1 is provided with a connecting piece 1c. The cutting body 2 also has a front end 2a and a rear end 2b. The cutting body 2 is also provided with two diametrically opposed slots 2c extending from the front end 2a. These slots 2c serve for the passage of the cooling water supplied through the carrier part 1 from the inside to the outside of the hollow drilling tool. The carrier 3 has a front end 3a and a rear end 3b. The front end 3a of the carrier 3 is connected to the rear end 2b of the cutting body 2. The carrier 3 is provided along its circumference with grooves 3c running in the axial direction. These grooves 3c serve to discharge the cooling water and the cuttings washed away with it. The webs remaining between the grooves 3c are used for guidance and are designed as segments 3d forms. The rear end 3b of the carrier 3 is connected to the front end 1a of the carrier part 1. This connection of the carrier part 1 to the carrier 3 can take place, for example, by welding or soldering. The connection between the cutting body 2 and the carrier 3 can also be made by welding or soldering. In addition, it is possible to sinter the cutting body 2 and the carrier 3 together. The axial extent 1 of the carrier 3 is a multiple of the axial extent s of the cutting body 2.

Das aus Fig. 3 ersichtliche Hohlbohrwerkzeug besteht aus einem Trägerteil 11 und an dessen vorderem Ende 11a ange­ordneten Schneidkörpern 12 und der Führung dienenden Seg­menten 13. Die Segmente 13 befinden sich zwischen dem Trä­gerteil 11 und den Schneidkörpern 12 und entsprechen im Querschnitt den Schneidkörpern 12. Die Schneidkörper 12 und die Segmente 13 können durch Sintern, Löten oder Schweissen miteinander verbunden werden. Die Segmente 13 werden durch Schweissen oder Löten mit dem Trägerteil 11 verbunden. Das Trägerteil 11 und die Segmente 13 sind nur stirnseitig mit­einander verbunden. Durch die Lücken zwischen den Segmenten 13 kann das Kühlwasser von der Innenseite zur Aussenseite des rohrförmigen Trägerteils 11 zirkulieren. Die axiale Er­streckung t der Segmente 13 entspricht etwa der axialen Er­streckung s der Schneidkörper 12. Dadurch ist gewährleistet, dass die Führung bis zur vollständigen Abnutzung der Schneidkörper 12 genügend ist.The hollow drilling tool shown in FIG. 3 consists of a carrier part 11 and on its front end 11a arranged cutting bodies 12 and the guiding segments 13. The segments 13 are located between the carrier part 11 and the cutting bodies 12 and correspond in cross section to the cutting bodies 12. Die Cutting body 12 and the segments 13 can be connected to one another by sintering, soldering or welding. The segments 13 are connected to the carrier part 11 by welding or soldering. The carrier part 11 and the segments 13 are connected to one another only at the end. Due to the gaps between the segments 13, the cooling water can circulate from the inside to the outside of the tubular support part 11. The axial extent t of the segments 13 corresponds approximately to the axial extent s of the cutting bodies 12. This ensures that the guidance is sufficient until the cutting bodies 12 are completely worn out.

Das aus Fig. 4 ersichtliche Hohlbohrwerkzeug besteht aus einem Trägerteil 21 und an dessen vorderem Ende 21a ange­ordneten Schneidkörpern 22 und Segmenten 23. Die Schneidkör­per 22 und die Segmente 23 sind in Ausnehmungen 21b des Trä­gerteils 21 angeordnet. Die axiale Erstreckung m der Segmente 23 beträgt etwa das Doppelte der axialen Erstreckung s der Schneidkörper 22. Dadurch ist eine gute Führung des Hohlbohr­ werkzeuges auch bei nahezu vollständig abgenutzten Schneid­körpern 22 sichergestellt. Die Segmente 23 sind vollständig in das Trägerteil 21 eingelassen. Die Schneidkörper 22 sind mit den Segmenten 23 verbunden. Zwischen den einzelnen Schneid­körpern 22 weist das Trägerteil 21 Durchbrüche 21c auf. Die­se Durchbrüche 21c dienen dem Durchtritt des Kühlwassers von der Innen- zur Aussenseite des Trägerteils 21.The hollow drilling tool shown in FIG. 4 consists of a carrier part 21 and cutting bodies 22 and segments 23 arranged at its front end 21a. The cutting bodies 22 and the segments 23 are arranged in recesses 21b of the carrier part 21. The axial extent m of the segments 23 is approximately twice the axial extent s of the cutting bodies 22. This ensures good guidance of the hollow drill tool ensured even with almost completely worn cutting bodies 22. The segments 23 are completely embedded in the carrier part 21. The cutting bodies 22 are connected to the segments 23. The carrier part 21 has openings 21c between the individual cutting bodies 22. These openings 21c serve for the passage of the cooling water from the inside to the outside of the carrier part 21.

Das aus Fig. 5 ersichtliche Hohlbohrwerkzeug besteht aus einem Trägerteil 31 und an dessen vorderem Ende 31a angeord­neten Schneidkörpern 32 und der Führung dienenden Segmenten 33. Die Segmente 33 und die Schneidkörper 32 sind vollständig in Ausnehmungen 31b des Trägerteils 31 eingelassen. Die axiale Erstreckung n der Segmente 33 beträgt etwa das Dreifache der Axialerstreckung s der Schneidkörper 32. Dies ergibt eine besonders grosse Führungslänge und ermöglicht somit die Herstellung sehr genauer Bohrungen. Zwischen den Schneidkörpern 32 ist das Trägerteil 31 mit Schlitzen 31c versehen. Diese Schlitze dienen dem Durchtritt des Kühlwassers. Die Schneidkörper 32 und die Segmente 33 können wiederum durch Schweissen, Löten oder Sintern miteinander verbunden werden. Die Verbindung der Segmente 33 mit dem Trägerteil 31 erfolgt durch Löten oder Schweissen.The hollow drilling tool shown in FIG. 5 consists of a carrier part 31 and cutting bodies 32 arranged at its front end 31a and segments 33 serving as guides. The segments 33 and the cutting bodies 32 are completely embedded in recesses 31b of the carrier part 31. The axial extent n of the segments 33 is approximately three times the axial extent s of the cutting bodies 32. This results in a particularly long guide length and thus enables very precise bores to be produced. The carrier part 31 is provided with slots 31c between the cutting bodies 32. These slots serve for the passage of the cooling water. The cutting bodies 32 and the segments 33 can in turn be connected to one another by welding, soldering or sintering. The segments 33 are connected to the carrier part 31 by soldering or welding.

Claims (7)

1. Hohlbohrwerkzeug mit einem rohrförmigen Trägerteil (1, 11, 21, 31) und an dessen vorderem Ende (1a, 11a, 21a, 31a) angeordneten Schneidkörpern (2, 12, 22, 32), dadurch gekennnzeichnet, dass zum Trägerteil (1, 11, 21, 31) hin entgegen der Vorschub­richtung anschliessend an die Schneidkörper (2, 12, 22, 32) Führungselemente angeordnet sind, deren Aussenkon­tur wenigstens entlang eines Teils des Umfanges der Aussenkontur der Schneidkörper (2, 12, 22, 32) ent­spricht, die Führungselemente (3d) gegenüber dem Trä­gerteil (1, 11, 21, 31) eine höhere Verschleissfestig­keit aufweisen und die Axialerstreckung (l, m, n, t) der Führungselemente mindestens der Axialerstreckung (s) der Schneidkörper (2, 12, 22, 32) entspricht.1. Hollow drilling tool with a tubular carrier part (1, 11, 21, 31) and at its front end (1a, 11a, 21a, 31a) arranged cutting bodies (2, 12, 22, 32), characterized in that the carrier part (1 , 11, 21, 31) against the feed direction, adjoining the cutting bodies (2, 12, 22, 32) are arranged, the outer contour of which corresponds at least along part of the circumference of the outer contour of the cutting bodies (2, 12, 22, 32) , the guide elements (3d) have a higher wear resistance than the carrier part (1, 11, 21, 31) and the axial extent (l, m, n, t) of the guide elements at least the axial extent (s) of the cutting bodies (2, 12, 22 , 32). 2. Hohlbohrwerkzeug nach Anspruch 1, dadurch gekennzeich­net, dass die Führungselemente als Segmente (3d, 13, 23, 33) ausgebildet sind.2. Hollow drilling tool according to claim 1, characterized in that the guide elements are designed as segments (3d, 13, 23, 33). 3. Hohlbohrwerkzeug nach Anspruch 2, dadurch gekennzeich­net, dass wenigstens drei, entlang dem Umfang verteilte Segmente (3d, 13, 23, 33) vorgesehen sind.3. Hollow drilling tool according to claim 2, characterized in that at least three segments (3d, 13, 23, 33) distributed along the circumference are provided. 4. Hohlbohrwerkzeug nach Anspruch 2 oder 3, dadurch gekenn­zeichnet, dass die Segmente (3d, 13, 23, 33) entgegen der Vorschubrichtung in Verlängerung anschliessend an die Schneidkörper (2, 12, 22, 32) angeordnet sind.4. Hollow drilling tool according to claim 2 or 3, characterized in that the segments (3d, 13, 23, 33) are arranged against the feed direction in an extension subsequent to the cutting body (2, 12, 22, 32). 5. Hohlbohrwerkzeug nach einem der Ansprüche 2 bis 4, da­durch gekennzeichnet, dass die Segmente (23, 33) in Ausnehmungen (21b, 31b) des Trägerteils (21, 31) ange­ordnet sind.5. Hollow drilling tool according to one of claims 2 to 4, characterized in that the segments (23, 33) are arranged in recesses (21b, 31b) of the carrier part (21, 31). 6. Hohlbohrwerkzeug nach einem der Ansprüche 2 bis 5, da­durch gekennzeichnet, dass die Segmente (3d) Teil eines zwischen dem Trägerteil (1) und den Schneidkörpern (2) angeordneten Trägers (3) sind.6. Hollow drilling tool according to one of claims 2 to 5, characterized in that the segments (3d) are part of a carrier (3) arranged between the carrier part (1) and the cutting bodies (2). 7. Hohlbohrwerkzeug nach einem der Ansprüche 1 bis 6, da­durch gekennzeichnet, dass die Führungselemente ver­schleissfeste Hartstoffe enthalten.7. Hollow drilling tool according to one of claims 1 to 6, characterized in that the guide elements contain wear-resistant hard materials.
EP89810661A 1989-01-20 1989-09-05 Trepanning tool Expired - Lifetime EP0378964B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89810661T ATE91933T1 (en) 1989-01-20 1989-09-05 HOLLOWING TOOL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3901528 1989-01-20
DE3901528A DE3901528A1 (en) 1989-01-20 1989-01-20 HOLLOW DRILLING TOOL

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EP0378964A2 true EP0378964A2 (en) 1990-07-25
EP0378964A3 EP0378964A3 (en) 1990-09-26
EP0378964B1 EP0378964B1 (en) 1993-07-28

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US (1) US5069584A (en)
EP (1) EP0378964B1 (en)
JP (1) JPH02224978A (en)
AT (1) ATE91933T1 (en)
CA (1) CA2008169C (en)
DE (2) DE3901528A1 (en)

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Also Published As

Publication number Publication date
DE58905054D1 (en) 1993-09-02
EP0378964A3 (en) 1990-09-26
ATE91933T1 (en) 1993-08-15
CA2008169C (en) 2000-01-04
US5069584A (en) 1991-12-03
DE3901528A1 (en) 1990-07-26
EP0378964B1 (en) 1993-07-28
JPH02224978A (en) 1990-09-06
CA2008169A1 (en) 1990-07-20

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