EP0349846B1 - Core drill bit - Google Patents

Core drill bit Download PDF

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Publication number
EP0349846B1
EP0349846B1 EP89111381A EP89111381A EP0349846B1 EP 0349846 B1 EP0349846 B1 EP 0349846B1 EP 89111381 A EP89111381 A EP 89111381A EP 89111381 A EP89111381 A EP 89111381A EP 0349846 B1 EP0349846 B1 EP 0349846B1
Authority
EP
European Patent Office
Prior art keywords
channels
carrier body
sides
cutting segments
drilling tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89111381A
Other languages
German (de)
French (fr)
Other versions
EP0349846A1 (en
Inventor
Eugen Dr. Magyari
Walter Ritt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to AT89111381T priority Critical patent/ATE76480T1/en
Publication of EP0349846A1 publication Critical patent/EP0349846A1/en
Application granted granted Critical
Publication of EP0349846B1 publication Critical patent/EP0349846B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—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
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • 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

Definitions

  • the invention relates to a hollow drilling tool with a tubular carrier body and at its front end arranged in the feed direction, the cutting segments projecting beyond the outer and inner contours of the carrier body.
  • Hollow drilling tools of the type mentioned, for example from DE-GM 8 515 322, are used in particular for drilling holes with a large cross section in rock, concrete, masonry and the like.
  • the cutting segments are provided with abrasive cutting particles, especially synthetic diamonds.
  • Drilling usually takes place with the simultaneous supply of a coolant.
  • the supply of the cooling liquid takes place with more or less high pressure and usually along the inside of the tubular support body, so that a drainage on the outside is ensured together with the drilling material.
  • the invention has for its object to provide a hollow drilling tool that allows good removal of the drill, even with less equipment.
  • the cutting segments are provided on their sides projecting beyond the outer and inner contours of the carrier body with a plurality of channels which run parallel to one another within the sides and which run in opposite directions to the longitudinal axis of the carrier body and serve to remove the drill material, the channels being open to the sides and to the circumferential contour delimiting these sides.
  • the coolant is additionally conveyed on the inside against the bottom of the borehole.
  • the slope of the grooves on the inside of the cutting segments runs in the opposite direction to the grooves on the outside of the segments.
  • the coolant is conveyed to the deepest of the borehole on the inside of the cutting segments and is conveyed towards the mouth of the borehole on the outside of the cutting segments.
  • the arrangement of a plurality of channels running parallel to one another ensures during the entire service life of the drilling tool that channels are available for removing the drill material from the cutting segments.
  • Good conveyance of the drilling material is advantageously achieved with channels running at an incline of 30 ° to 60 °.
  • the channels advantageously have a U-shaped cross section.
  • the U-shaped cross section of the channels can be angular or rounded.
  • the depth and width of the U-shaped The cross section of the channels preferably corresponds approximately to the dimension by which the cutting segments project beyond the outer contour of the carrier body.
  • Another advantage of the channels according to the invention is that this increases the surface of the cutting segments and thus improves the heat transfer from the cutting segments to the cooling liquid. Overheating of the cutting segments can be avoided by the improved heat supply.
  • This drawing shows a hollow drilling tool according to the invention in a perspective view.
  • the hollow drilling tool essentially consists of a carrier body 1 with a front end 1a in the feed direction and a rear end 1b.
  • the rear end 1b is designed as a reduced diameter connecting piece 1c for connection to a drilling device known per se, not shown.
  • the end region adjoining the front end 1a is formed with essentially U-shaped recesses 1d for receiving cutting segments 2.
  • the cutting segments 2 have an outwardly directed outer side 2a and an inwardly directed inner side 2b arranged opposite this.
  • the cutting segments are provided on their outer side 2a and on their inner side 2b with channels 2c, 2d which are inclined to the longitudinal axis of the carrier body 1 and open on both sides and towards the outer contour.
  • the channels 2c, 2d are arranged parallel to each other on one side.
  • the pitch angle A of the channels 2c, 2d is approximately 45 °.
  • the direction of inclination of the channels 2c, 2d is opposite on the outside 2a and on the inside 2b.
  • the channels 2c, 2d can also be arranged only in part of the cutting segments 2 or on one side of the cutting segments 2. In the latter case, it is expedient to arrange the channels 2c on the outside 2a of the cutting segments 2.

Landscapes

  • 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)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
  • Surgical Instruments (AREA)
  • Dowels (AREA)

Abstract

A hollow drill bit is formed of an axially extending tubularly-shaped support member (1) with cutter elements (2) inserted into the leading end (1a) of the support member. Each cutter member (2) has a radially outer surface (2a) and a radially inner surface (2b) with channels (2c, 2d) in each surface inclined relative to the axis of the support member (1). The channels (2c,2d) carry a flowable cooling agent to the leading end of the drill bit, and remove drillings produced by the bit from the leading end.

Description

Die Erfindung betrifft ein Hohlbohrwerkzeug mit einem rohrförmigen Trägerkörper und an dessen in Vorschubrichtung vorderem Ende angeordneten, die Aussen- und die Innenkontur des Trägerkörpers überragenden Schneidsegmenten.The invention relates to a hollow drilling tool with a tubular carrier body and at its front end arranged in the feed direction, the cutting segments projecting beyond the outer and inner contours of the carrier body.

Hohlbohrwerkzeuge der genannten, beispielsweise aus dem DE-GM 8 515 322 bekannten Art werden insbesondere zum Bohren von Löchern mit grossem querschnitt in Gestein, Beton, Mauerwerk und dergleichen verwendet. Die Schneidsegmente sind dabei mit abrasiven Schneidpartikeln, insbesondere mit synthetischen Diamanten versehen.Hollow drilling tools of the type mentioned, for example from DE-GM 8 515 322, are used in particular for drilling holes with a large cross section in rock, concrete, masonry and the like. The cutting segments are provided with abrasive cutting particles, especially synthetic diamonds.

Das Bohren erfolgt meist unter gleichzeitigem Zuführen einer Kühlflüssigkeit. Die Zufuhr der Kühlflüssigkeit erfolgt dabei mit mehr oder weniger hohem Druck und meist an der Innenseite des rohrförmigen Trägerkörpers entlang, so dass ein Abfliessen an der Aussenseite mitsamt dem Bohrgut gewährleistet ist. Allerdings ist es in der Praxis, insbesondere bei mobilen Bohrgeräten, nicht immer möglich, für die Kühlflüssigkeit einen ausreichend hohen Druck für die genügende Abfuhr des Bohrgutes zur Verfügung zu stellen.Drilling usually takes place with the simultaneous supply of a coolant. The supply of the cooling liquid takes place with more or less high pressure and usually along the inside of the tubular support body, so that a drainage on the outside is ensured together with the drilling material. However, in practice, especially in the case of mobile drilling rigs, it is not always possible to provide the cooling liquid with a sufficiently high pressure for the sufficient removal of the drilling material.

Der Erfindung liegt die Aufgabe zugrunde, ein Hohlbohrwerkzeug zu schaffen, das eine gute Abfuhr des Bohrgutes, auch bei geringerem apparativen Aufwand ermöglicht.The invention has for its object to provide a hollow drilling tool that allows good removal of the drill, even with less equipment.

Gemäss Erfindung wird dies dadurch erreicht, dass die Schneidsegmente an ihrer die Aussen- und die Innenkontur des Trägerkörpers überragenden Seiten mit mehreren innerhalb der Seiten parallel zueinander und zur Längsachse des Trägerkörpers in Bezug auf die Seiten gegensinnig geneigt verlaufenden, der Bohrgutabfuhr dienenden Kanäle versehen sind, wobei die Kanäle zu den Seiten und zu der diese Seiten begrenzenden Umfangskontur hin offen sind.According to the invention, this is achieved in that the cutting segments are provided on their sides projecting beyond the outer and inner contours of the carrier body with a plurality of channels which run parallel to one another within the sides and which run in opposite directions to the longitudinal axis of the carrier body and serve to remove the drill material, the channels being open to the sides and to the circumferential contour delimiting these sides.

Durch die Anordnung der Kanäle an der die Aussenkontur des Trägerkörpers überragenden Seite der Schneidsegmente wird die Kühlflüssigkeit samt dem Bohrgut zur Bohrlochmündung gefördert. Ein solch vorteilhaftes fördern wird insbesondere dann erzielt, wenn die Drehrichtung des Bohrwerkzeuges dem Steigungssinn der Kanäle entspricht.The arrangement of the channels on the side of the cutting segments projecting beyond the outer contour of the carrier body the coolant and the drilling material are conveyed to the hole opening. Such advantageous conveying is achieved in particular when the direction of rotation of the drilling tool corresponds to the sense of incline of the channels.

Durch die Anordnung von Kanälen der nach innen gerichteten Seite der Schneidsegmente wird die Kühlflüssigkeit zusätzlich an der Innenseite gegen den Bohrlochgrund gefördert. Die Steigung der Nuten an der Innenseite der Schneidsegmente verläuft gegensinnig zu den Nuten auf der Aussenseite der Segmente. Dadurch entsteht an der Innenseite der Schneidsegmente eine Förderung der Kühlflüssigkeit zum Bohrlochtiefsten hin und an der Aussenseite der Schneidsegmente eine Förderung in Richtung der Bohrlochmündung.Due to the arrangement of channels on the inward side of the cutting segments, the coolant is additionally conveyed on the inside against the bottom of the borehole. The slope of the grooves on the inside of the cutting segments runs in the opposite direction to the grooves on the outside of the segments. As a result, the coolant is conveyed to the deepest of the borehole on the inside of the cutting segments and is conveyed towards the mouth of the borehole on the outside of the cutting segments.

Da die Schneidsegmente beim Einsatz des Hohlbohrwerkzeuges abgenutzt werden, ist durch die Anordnung mehrerer parallel zueinander verlaufender Kanäle während der ganzen Lebensdauer des Bohrwerkzeuges gewährleistet, dass Kanäle zur Abfuhr des Bohrgutes an den Schneidsegmenten zur Verfügung stehen.Since the cutting segments are worn out when the hollow drilling tool is used, the arrangement of a plurality of channels running parallel to one another ensures during the entire service life of the drilling tool that channels are available for removing the drill material from the cutting segments.

Eine gute Förderung des Bohrgutes wird mit zweckmässigerweise unter einem Steigungswinkel von 30° bis 60° verlaufenden Kanälen erzielt.Good conveyance of the drilling material is advantageously achieved with channels running at an incline of 30 ° to 60 °.

Die Kanäle weisen vorteilhaft U-förmigen querschnitt auf. Der U-förmige querschnitt der Kanäle kann dabei eckig oder gerundet ausgebildet sein. Die Tiefe und Breite des U-förmigen Querschnitts der Kanäle entspricht vorzugsweise etwa dem Mass, um das die Schneidsegmente die Aussenkontur des Trägerkörpers überragen.The channels advantageously have a U-shaped cross section. The U-shaped cross section of the channels can be angular or rounded. The depth and width of the U-shaped The cross section of the channels preferably corresponds approximately to the dimension by which the cutting segments project beyond the outer contour of the carrier body.

Ein weiterer Vorteil der erfindungsgemässen Kanäle besteht darin, dass dadurch die Oberfläche der Schneidsegmente vergrössert und somit die Wärmeübertragung von den Schneidsegmenten an die Kühlflüssigkeit verbessert wird. Durch die verbesserte Wärmezufuhr können Ueberhitzungen der Schneidsegmente vermieden werden.Another advantage of the channels according to the invention is that this increases the surface of the cutting segments and thus improves the heat transfer from the cutting segments to the cooling liquid. Overheating of the cutting segments can be avoided by the improved heat supply.

Die Erfindung soll nachstehend anhand der sie beispielsweise wiedergebenden Zeichnung näher erläutert werden. Diese Zeichnung zeigt ein erfindungsgemässes Hohlbohrwerkzeug in perspektivischer Darstellung.The invention will be explained in more detail below with the aid of the drawing, for example. This drawing shows a hollow drilling tool according to the invention in a perspective view.

Das Hohlbohrwerkzeug besteht im wesentlichen aus einem Trägerkörper 1 mit einem in Vorschubrichtung vorderen Ende 1a und einem rückwärtigen Ende 1b. Das rückwärtige Ende 1b ist als im Durchmesser reduzierter Anschlussstutzen 1c zum Verbinden mit einem an sich bekannten, nicht dargestellten Bohrgerät ausgebildet. Der an das vordere Ende 1a anschliessende Endbereich ist mit im wesentlichen U-förmigen Ausnehmungen 1d zur Aufnahme von Schneidsegmenten 2 ausgebildet. Die Schneidsegmente 2 weisen eine nach aussen gerichtete Aussenseite 2a und eine dieser gegenüberliegend angeordnete, nach innen gerichtete Innenseite 2b auf. Die Schneidsegmente sind an ihrer Aussenseite 2a und an ihrer Innenseite 2b mit zur Längsachse des Trägerkörpers 1 geneigt verlaufenden, beidseits und zur Aussenkontur hin offenen Kanälen 2c, 2d versehen. Die Kanäle 2c, 2d sind auf je einer Seite parallel zueinander angeordnet. Der Steigungswinkel A der Kanäle 2c, 2d beträgt etwa 45°. Der Steigungssinn der Kanäle 2c, 2d ist an der Aussenseite 2a und an der Innenseite 2b entgegengesetzt. Dadurch wird beim drehenden Antreiben des Hohlbohrwerkzeuges in Richtung des Pfeiles D durch die Kanäle 2d an der Innenseite 2b der Schneidsegmente eine zum vorderen Ende 1a des Trägerkörpers 1 bzw zum Bohrlochtiefsten hin wirkende Förderung eines flüssigen oder pastösen Kühl- bzw Schmiermittels erzeugt. Die an der Aussenseite 2a angeordneten Kanäle 2c bewirken dann eine Förderung des Kühlmittels samt dem anfallenden Bohrgut zum rückwärtigen Ende 1b des Trägerkörpers 1 bzw zur Bohrlochmündung hin.The hollow drilling tool essentially consists of a carrier body 1 with a front end 1a in the feed direction and a rear end 1b. The rear end 1b is designed as a reduced diameter connecting piece 1c for connection to a drilling device known per se, not shown. The end region adjoining the front end 1a is formed with essentially U-shaped recesses 1d for receiving cutting segments 2. The cutting segments 2 have an outwardly directed outer side 2a and an inwardly directed inner side 2b arranged opposite this. The cutting segments are provided on their outer side 2a and on their inner side 2b with channels 2c, 2d which are inclined to the longitudinal axis of the carrier body 1 and open on both sides and towards the outer contour. The channels 2c, 2d are arranged parallel to each other on one side. The pitch angle A of the channels 2c, 2d is approximately 45 °. The direction of inclination of the channels 2c, 2d is opposite on the outside 2a and on the inside 2b. As a result, when the hollow drilling tool rotates in the direction of arrow D through the channels 2d on the inside 2b of the cutting segments, one that acts towards the front end 1a of the carrier body 1 or the deepest hole Delivery of a liquid or pasty coolant or lubricant generated. The channels 2c arranged on the outside 2a then cause the coolant together with the resulting drill material to be conveyed to the rear end 1b of the carrier body 1 or to the hole opening.

Die Kanäle 2c, 2d können auch nur bei einem Teil der Schneidsegmente 2 bzw auf einer Seite der Schneidsegmente 2 angeordnet werden. Im letzteren Fall ist es zweckmässig, die Kanäle 2c auf der Aussenseite 2a der Schneidsegmente 2 anzuordnen.The channels 2c, 2d can also be arranged only in part of the cutting segments 2 or on one side of the cutting segments 2. In the latter case, it is expedient to arrange the channels 2c on the outside 2a of the cutting segments 2.

Claims (3)

1. A hollow drilling tool having a tubular carrier body (1) and cutting segments (2) which are arranged on the front end (1a) thereof in the feed direction and which project beyond the outer and inner contour of the carrier body (1),
characterised in that the cutting segments (2) are provided, on their sides (2a, 2b) which project beyond the outer and the inner contour of the carrier body (1), with several channels (2c, 2d) which extend parallel to one another within the sides (2a, 2b) and oppositely inclined with regard to the longitudinal axis of the carrier body (1) and with respect to the sides (2a, 2b) and which serve for the removal of the drill chips, the channels (2c, 2d) being open towards both sides (2a, 2b) and towards the peripheral contour bounding these sides (2a, 2b).
2. A hollow drilling tool according to claim 1, characterised in that the channels (2c, 2d) extend at an angle of inclination (A) of 30° up to 60°.
3. A hollow drilling tool according to claim 1 or 2, characterised in that the channels (2c, 2d) have a U-shaped cross-section.
EP89111381A 1988-07-01 1989-06-22 Core drill bit Expired - Lifetime EP0349846B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89111381T ATE76480T1 (en) 1988-07-01 1989-06-22 HOLLOWING TOOL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3822249A DE3822249A1 (en) 1988-07-01 1988-07-01 HOLLOW DRILLING TOOL
DE3822249 1988-07-01

Publications (2)

Publication Number Publication Date
EP0349846A1 EP0349846A1 (en) 1990-01-10
EP0349846B1 true EP0349846B1 (en) 1992-05-20

Family

ID=6357726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89111381A Expired - Lifetime EP0349846B1 (en) 1988-07-01 1989-06-22 Core drill bit

Country Status (5)

Country Link
US (1) US4915182A (en)
EP (1) EP0349846B1 (en)
AT (1) ATE76480T1 (en)
CA (1) CA1314282C (en)
DE (2) DE3822249A1 (en)

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US5791837A (en) * 1996-08-16 1998-08-11 Johnson; Samuel Annular tool for cutting holes in metal
US5868125A (en) * 1996-11-21 1999-02-09 Norton Company Crenelated abrasive tool
US6250403B1 (en) * 1997-09-30 2001-06-26 The Charles Machine Works, Inc. Device and method for enlarging a Bore
FR2824008A1 (en) * 2001-04-26 2002-10-31 Michelin Soc Tech TIRE MACHINING TOOL
US6761514B2 (en) 2001-10-19 2004-07-13 Master Tool Corporation Hollow mill tool
US7373994B2 (en) * 2004-10-07 2008-05-20 Baker Hughes Incorporated Self cleaning coring bit
RU2443847C1 (en) * 2010-10-11 2012-02-27 Николай Митрофанович Панин Drilling bit
RU2460613C1 (en) * 2011-06-28 2012-09-10 Юрий Михайлович Ермаков Annular drill
RU2473772C1 (en) * 2011-10-27 2013-01-27 Николай Митрофанович Панин Crown for impact-rotary drilling
CN103998183A (en) * 2011-12-30 2014-08-20 圣戈班磨料磨具有限公司 Grinding ring with dual function grinding segments
CA2825729C (en) * 2012-11-21 2018-05-22 Diamond Products, Limited Diamond mining core drill bit and methods of making thereof
CN103195372B (en) * 2013-04-24 2016-08-17 中国电建集团中南勘测设计研究院有限公司 A kind of screw type bit and a kind of foam drilling device and foam drilling technique
KR101705194B1 (en) * 2015-07-06 2017-02-09 주식회사 에지텍 The manufacturing method of core drill and that core drill
BE1023352B1 (en) * 2016-01-29 2017-02-13 Diarotech S.A. MINERAL CROWN COMPRISING IMPREGNATED DIAMOND SEGMENTS OBTAINED BY HOT SINTING
RU174005U1 (en) * 2016-02-16 2017-09-25 Федеральное государственное бюджетное образовательное учреждение высшего образования Балтийский государственный технический университет "ВОЕНМЕХ" им. Д.Ф. Устинова (БГТУ "ВОЕНМЕХ") TOOL FOR DRILLING DEEP HOLES
US11105158B2 (en) 2018-07-12 2021-08-31 Halliburton Energy Services, Inc. Drill bit and method using cutter with shaped channels
USD951313S1 (en) 2018-07-12 2022-05-10 Halliburton Energy Services, Inc. PDC cutter
WO2021006912A1 (en) * 2019-07-11 2021-01-14 Halliburton Energy Services, Inc. Drill bit cutter

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Also Published As

Publication number Publication date
ATE76480T1 (en) 1992-06-15
US4915182A (en) 1990-04-10
EP0349846A1 (en) 1990-01-10
CA1314282C (en) 1993-03-09
DE3822249A1 (en) 1990-01-04
DE58901461D1 (en) 1992-06-25

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