WO2004027206A1 - Outil de forage rotatif avec organe de retenue de plaquette de coupe - Google Patents

Outil de forage rotatif avec organe de retenue de plaquette de coupe Download PDF

Info

Publication number
WO2004027206A1
WO2004027206A1 PCT/IB2003/004037 IB0304037W WO2004027206A1 WO 2004027206 A1 WO2004027206 A1 WO 2004027206A1 IB 0304037 W IB0304037 W IB 0304037W WO 2004027206 A1 WO2004027206 A1 WO 2004027206A1
Authority
WO
WIPO (PCT)
Prior art keywords
recess
cutting insert
bit body
bit
projections
Prior art date
Application number
PCT/IB2003/004037
Other languages
English (en)
Inventor
Dirk Jacobus Du Plooy
Original Assignee
Boart Longyear Gmbh & Co Kg
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 Boart Longyear Gmbh & Co Kg filed Critical Boart Longyear Gmbh & Co Kg
Priority to AU2003264922A priority Critical patent/AU2003264922A1/en
Publication of WO2004027206A1 publication Critical patent/WO2004027206A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • 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
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/58—Chisel-type inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23B2222/28—Details of hard metal, i.e. cemented carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/08—Brazed connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts

Definitions

  • THIS invention relates to a rotary boring bit with a cutting insert retaining means.
  • the invention is concerned with rotary boring bits with multiple wings or prongs, each supporting a hardmetai insert, such as are commonly used to bore holes in coal or. other soft rock.
  • a hardmetai insert such as are commonly used to bore holes in coal or. other soft rock.
  • Such bits have a bit body with two or more angularly spaced and forwardly projecting wings or prongs.
  • each prong is recessed to accommodate a hardmetai insert of polygonal shape, each insert presenting a leading edge which carries out a cutting action as boring of a hole proceeds.
  • the inserts are secured to their respective prongs by brazing.
  • the braze components and inserts are placed in the respective recesses and the assembly is heated in an induction heater which melts the braze. On resolidification, the braze secures the insert in the recess.
  • a multi-wing rotary boring bit comprising a bit body having a plurality of wings each of which is formed with a recess, and a cutting insert secured in each recess by a brazing operation, the bit body carrying integral projections arranged to hold the inserts in position in the recesses during the brazing operation.
  • each projection extends in a forward direction into the associated recess and is spaced from a back wall of the recess, and the associated cutting insert includes a portion, located behind the rebate therein, which is located in the space between the projection and the back wall.
  • each projection is a rectangular, blade-like formation and may have one face flush with a face of the associated cutting insert.
  • a bit body for a multi-wing rotary boring bit having a plurality of wings each of which is formed with a recess to accommodate a cutting insert to be secured in the recess by a brazing operation, and the bit body carrying integral projections arranged to hold the inserts in position in the recess during the brazing operation.
  • the projections are preferably arranged to be received in rebates in the cutting inserts.
  • a cutting insert for a multi-wing boring bit the cutting insert being shaped to be accommodated in a recess in a wing of a bit body as summarized above, the cutting insert having a rebate therein shaped to receive one of the integral projections of the bit body.
  • the insert may have opposite major surfaces and a rebate of polygonal shape formed in one of the major surfaces.
  • Figure 1 illustrates, in an exploded perspective view, a rotary boring bit and cutting insert according to the invention
  • Figure 2 shows a pespective view of the assembled boring bit
  • Figure 3 shows a cross-section at the line 3-3 in Figure 2.
  • the drawings show a multi-wing rotary boring bit 10 which includes a steel bit body 12 and cutting inserts 14 typically of tungsten carbide or other hardmetai.
  • the cutting inserts 14 are of polygonal shape and have forward or leading cutting edges 16.
  • the bit body 12 includes a pair of diametrically opposed prongs or wings 18 each of which is formed with a recess 20 to receive and accommodate one of the cutting inserts such that the leading cutting edge 16 of the insert projects a short distance forwardly beyond the leading extremity of the wing itself.
  • the bit 12 also includes, for each recess 20, an integral projection 22 which extends into the recess in a forward direction from the base 24 of the recess.
  • each projection 22 is a rectangular, blade-like formation one face 26 of which is flush with the corresponding face 28 of the associated wing 18 and the other face 30 of which is spaced from the back wall 32 of the recess as indicated by the numeral 34.
  • the cutting inserts 14 are formed with recesses or rebates 36 complemental in shape to the projections 22.
  • each cutting insert is slid rearwardly relative to a wing 18, as indicated by the arrow 37, such that the associated projection 22 is received in the rebate 36 with a portion 38 of the insert, situated behind the rebate, locating in the space 34.
  • appropriate braze components are also placed in each recess behind the cutting insert.
  • the back wall 34 of the recess may carry ribs or other projections which serve to space the face 40 of the insert away from that wall, thereby creating room for the braze components.
  • the projections 22 are received complementally as snug fits in the rebates 36 and serve to locate the cutting inserts properly in the recesses 20. Throughout transportation to the brazing station and during the brazing operation itself, the projections also hold the cutting inserts in the proper position and at the proper orientation. This avoids the need for installation of the conventionally used clips or other retainers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

Un aspect de l'invention concerne un outil de forage rotatif à ailettes multiples (10) du type comprenant un corps d'outil (12) pourvu d'une pluralité d'ailettes (18) possédant chacune un évidement (20), ainsi qu'une plaquette de coupe (14) fixée dans chaque évidement au moyen d'une opération de brasage. Selon cet aspect de l'invention, le corps d'outil supporte des éléments saillants intégrés (26) destinés à assurer le maintien des plaquettes dans les évidements pendant l'opération de brasage. Habituellement, les plaquettes de coupe comportent des feuillures (36) dans lesquelles ces éléments saillants sont reçus.
PCT/IB2003/004037 2002-09-20 2003-09-19 Outil de forage rotatif avec organe de retenue de plaquette de coupe WO2004027206A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003264922A AU2003264922A1 (en) 2002-09-20 2003-09-19 Rotary boring bit with cutting insert retaining means

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200207579 2002-09-20
ZA2002/7579 2002-09-20

Publications (1)

Publication Number Publication Date
WO2004027206A1 true WO2004027206A1 (fr) 2004-04-01

Family

ID=32031276

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2003/004037 WO2004027206A1 (fr) 2002-09-20 2003-09-19 Outil de forage rotatif avec organe de retenue de plaquette de coupe

Country Status (2)

Country Link
AU (1) AU2003264922A1 (fr)
WO (1) WO2004027206A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1749615A1 (fr) * 2005-08-02 2007-02-07 Michael Curtat Procédé de brasage de deux éléments comprenant des évidements sur leurs surfaces brasées en contact

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356873A (en) * 1980-12-08 1982-11-02 Mining Tools, Div. Of Smith Int'l., Inc. Cutter mounting and apparatus and method for a drill bit
US5137398A (en) * 1990-04-27 1992-08-11 Sumitomo Electric Industries, Ltd. Drill bit having a diamond-coated sintered body
WO1995030066A1 (fr) * 1994-05-03 1995-11-09 Kennametal Inc. Foret roatif
EP0790387A1 (fr) * 1996-01-16 1997-08-20 Plica Werkzeugfabrik Ag Plaque de métal dur, trépan de roche pourvu d'une telle plaque et méthode pour sa fabrication
WO2001061142A1 (fr) * 2000-02-15 2001-08-23 Kennametal Inc. Trepan, element dur, et corps de trepan

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356873A (en) * 1980-12-08 1982-11-02 Mining Tools, Div. Of Smith Int'l., Inc. Cutter mounting and apparatus and method for a drill bit
US5137398A (en) * 1990-04-27 1992-08-11 Sumitomo Electric Industries, Ltd. Drill bit having a diamond-coated sintered body
WO1995030066A1 (fr) * 1994-05-03 1995-11-09 Kennametal Inc. Foret roatif
EP0790387A1 (fr) * 1996-01-16 1997-08-20 Plica Werkzeugfabrik Ag Plaque de métal dur, trépan de roche pourvu d'une telle plaque et méthode pour sa fabrication
WO2001061142A1 (fr) * 2000-02-15 2001-08-23 Kennametal Inc. Trepan, element dur, et corps de trepan

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1749615A1 (fr) * 2005-08-02 2007-02-07 Michael Curtat Procédé de brasage de deux éléments comprenant des évidements sur leurs surfaces brasées en contact
FR2889470A1 (fr) * 2005-08-02 2007-02-09 Michel Curtat Procede de brasage de deux elements

Also Published As

Publication number Publication date
AU2003264922A1 (en) 2004-04-08

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