EP2921639A1 - Percussive drill bit with multiple sets of front cutting inserts - Google Patents

Percussive drill bit with multiple sets of front cutting inserts Download PDF

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Publication number
EP2921639A1
EP2921639A1 EP14160500.6A EP14160500A EP2921639A1 EP 2921639 A1 EP2921639 A1 EP 2921639A1 EP 14160500 A EP14160500 A EP 14160500A EP 2921639 A1 EP2921639 A1 EP 2921639A1
Authority
EP
European Patent Office
Prior art keywords
inserts
drill bit
sets
front face
axis
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.)
Withdrawn
Application number
EP14160500.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Rasmus Hemph
Anna Nordstrand
Anders Nordberg
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.)
Sandvik Intellectual Property AB
Original Assignee
Sandvik Intellectual Property AB
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 Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Priority to EP14160500.6A priority Critical patent/EP2921639A1/en
Priority to RU2016140628A priority patent/RU2671386C2/ru
Priority to KR1020167025105A priority patent/KR20160133445A/ko
Priority to US15/126,335 priority patent/US20170081920A1/en
Priority to AU2015233739A priority patent/AU2015233739C1/en
Priority to MX2016011966A priority patent/MX2016011966A/es
Priority to CA2939473A priority patent/CA2939473A1/en
Priority to CN201580011437.8A priority patent/CN106103879B/zh
Priority to PCT/EP2015/054846 priority patent/WO2015139989A2/en
Publication of EP2921639A1 publication Critical patent/EP2921639A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a percussive rock drill bit and in particular, although not exclusively, to a drill bit formed with a cutting head mounting a plurality of front cutting inserts arranged into sets with each set distributed at different radial positions at a front face of the cutting head.
  • Percussion drill bits are widely used both for drilling relatively shallow bores in hard rock and for creating deep boreholes.
  • drill strings are typically used in which a plurality of rods are interconnected to advance the drill bit and increase the depth of the hole.
  • a terrestrial machine is operative to transfer a combined impact and rotary drive motion to an upper end of the drill string whilst a drill bit positioned at the lower end is operative to crush the rock and form the boreholes.
  • the impact is delivered not through the upper end of the string, but by a hammer directly connected to the drill bit within the hole.
  • the drill bit typically comprises a drill head that mounts a plurality of hard cutting inserts, commonly referred to as buttons.
  • buttons comprise a carbide based material to enhance the lifetime of the drill bit.
  • the drill bit comprises a plurality of gauge buttons distributed circumferentially at an outer perimeter of the head that are configured to engage material to be crushed and to determine the diameter of the borehole.
  • the head also mounts a plurality of front buttons provided at a front face of the head for engaging material to be crushed at the axial forwardmost region of drilling.
  • Example percussive drill bits are disclosed in US 3,357,507 ; US 3,388,756 , US 3,955,635 ; US 2008/0087473 ; US 2008/0078584 ; WO 2012/17460 ; WO 2006/033606 ; WO 2009/067073 ; US 7,527,110 ; US 7,392,863 ; EP 2592216 ; WO 2012/038428 and EP 2383420 .
  • the cutting inserts are distributed over the front face in sets or seemingly randomly at different locations not on a common circumferential path.
  • the multiplicity of inserts increases progressively from the radially inner to radially outer region of the front face.
  • each insert In order for the bit to advance into the rock during drilling, each insert must crush the rock in its circumferential path. Where a particular region of the front face includes a single insert, a full 360° rotation is needed to advance the bit axially forward. Accordingly, the inserts at those regions of the bit with the fewer neighbouring inserts have a higher wear rate and also limit the penetration rate of the bit. Accordingly, what is required is a drill bit that addresses these problems.
  • a percussive rock drill bit comprising: a head provided at one end of an elongate shank, the head having a forward facing front face defined by a perimeter edge; a plurality of front cutting inserts distributed at the front face at different radial positions between a central axis extending through the drill bit and the perimeter edge of the front face; characterised in that: the front cutting inserts are grouped into a plurality of sets with each set positioned at a different radial distance from the axis and each insert of each respective set is positioned at substantially the same radial distance; wherein the sets each comprise the same number of inserts.
  • each insert of each respective set positioned at substantially the same radial distance' encompasses the axial centres of each of the inserts within each set positioned on the same circumferential path and at the same radial separation distance from the axis.
  • the term also encompasses the axial centres of at least some of the insert within each respective set being positioned radially outside or inside other inserts within the same set.
  • Such a variation includes the positioning of the axial centre of one or more inserts within a set so as to be eccentric (off-set) relative to the other inserts within the same set by up to a diameter (D), a radius, a third diameter (D/3) or a quarter diameter (D/4) of the inserts within the set.
  • each set comprises from three to six cutting inserts.
  • each set comprises four inserts.
  • Such an arrangement represents an optimised compromise between minimising wear of the inserts and also minimising an overall weight of the cutting bit that naturally increases with a larger number of inserts.
  • each set comprises from two to eight sets of front cutting inserts.
  • the bit comprises four sets of inserts.
  • an inner set of the inserts represents a radially innermost set of front buttons.
  • the drill bit comprises an additional set of innermost front buttons that comprises a number of cutting inserts being less than the number of inserts within the radially outer sets (with each of these radially outer sets comprising the same number of cutting inserts in accordance with the subject invention).
  • An additional set of innermost inserts having a lower number of inserts relative to the radially outer sets may be advantageous for use with smaller diameter drill bit heads.
  • a diameter of the inserts of each set increases in a direction radially outward from the axis.
  • a diameter of the inserts within all or some of the sets may be substantially equal.
  • the radially outer sets may comprise larger diameter inserts relative to the inner sets to compensate for the increased angular velocity during drilling so as to provide a uniform insert wear rate across all sets.
  • a central region of the front face is positioned axially forward of the perimeter edge.
  • the front face is generally convex such that a central region of the front face is positioned axially forward of the perimeter edge.
  • the front face may be dome-shaped that is tilted axially rearward towards the shank such that a radially innermost part of the front face is positioned axially forward relative to a perimeter edge of the head.
  • the axially forward region of the head may be substantially planar or flat or comprise a cavity so as to be generally concave having a peripheral collar that projects axially forward of a radially innermost region within which is mounted the plurality of sets of inserts.
  • the annular collar of the head may comprise one or a plurality of sets of the front buttons in addition to gauge buttons.
  • an angle between neighbouring inserts within each respective set is substantially equal. That is, the separation distance between neighbouring inserts in a circumferential direction around the central axis within each set is substantially equal.
  • the angle between neighbouring inserts (within each set) is substantially equal for all sets at the front face.
  • a distance in the circumferential direction between neighbouring inserts within each set increases between the sets in a direction radially outward from the central axis.
  • the increase in circumferential separation distance between inserts within the sets in a direction progressively outward from the axis is a consequence of the uniform angular separation between neighbouring inserts within all sets.
  • the drill bit may comprise a first inner set positioned radially innermost at or towards the axis relative to other sets; and a first intermediate set positioned radially between the first inner set and a gauge group of cutting inserts positioned at or towards the perimeter edge.
  • the drill bit may further comprise a second intermediate set positioned radially intermediate the first intermediate set and the gauge group.
  • the drill bit may further comprise a second inner set positioned radially intermediate the first inner set and the first intermediate set.
  • Such an arrangement is beneficial to maximise the drilling rate and service lifetime of the drill bit configured with a domed or convex front face.
  • a number of different sets of inserts may vary according to the size, geometry and shape profile of the bit head including in particular flat and concave front face regions.
  • percussive drilling apparatus comprising a drill bit as claimed herein.
  • a drill bit 100 comprises a drill head 101 formed at one end of a generally elongate shaft 102 with both head 101 and shaft 102 centred on a longitudinal axis 108.
  • Shaft 102 comprises splines 109 to engage with corresponding splines of a drive tool (not shown) that surrounds the shaft 102 during use.
  • Head 101 comprises an axially forward section 111 and an axially rearward skirt section 110 that interfaces with shaft 102.
  • Section 111 comprises a larger diameter than skirt 110 and is defined, in part, by an annual outermost perimeter edge 106.
  • a forward facing front face indicated generally by reference 105 projects axially forward from edge 106 such that the forward facing part of section 111 is generally convex and comprises a dome-shaped profile when viewed from the side or in cross section.
  • Forward head section 111 tapers rearwardly from edge 106 via a short longitudinally extending trailing surface 107 that mates with an axially forward region of skirt 110.
  • Front face 105 may be considered to be segmented radially into a plurality of annular regions extending between axis 108 and perimeter edge 106.
  • face 105 comprises an outer peripheral region 200 that is defined at its perimeter by edge 106.
  • Region 200 is chamfered to taper rearwardly relative to axis 108 so as to be declined relative to a radially innermost region 203 that is aligned substantially perpendicular to axis 108.
  • Region 203 is axially raised to form a platform 204 that is upstanding from a first intermediate region 202.
  • Region 202 is also aligned substantially perpendicular to axis 108.
  • the first intermediate region 202 is surrounded by a second intermediate region 201 that is chamfered to taper rearwardly relative to axis 108.
  • Second intermediate region 201 is positioned radially between the first intermediate region 202 and the perimeter region 200.
  • the declined angle by which region 201 extends from axis 108 is less than the corresponding angle by which peripheral region 200 extends relative to axis 108.
  • regions 200 to 203 collectively define a generally convex front face 105 that projects axially forward from perimeter edge 106.
  • Head 101 mounts a plurality of hardened cutting inserts indicated generally by references 103 and 104 formed from a carbide based material such as cemented carbide or tungsten carbide for example.
  • inserts 103, 104 are generally dome-shaped.
  • inserts 103, 104 may have axially forward cutting tips that are rounded, conical, ballistic, semispherical, flat or pointed according to conventional cutting insert configurations.
  • the inserts 103, 104 are embedded in head section 111 so as to stand axially proud of front face 105.
  • gauge inserts 103 are positioned at or towards perimeter edge 106 to determine and maintain a predetermined diameter of the borehole during formation.
  • Gauge inserts 103 are tilted radially outward so as to be generally inclined and outward facing from axis 108 consistent with peripheral region 200.
  • inserts 104 that are positioned radially within gauge inserts 103 are grouped into a plurality of sets with each set positioned at a different radial distance from axis 108. Additionally, each insert 104 of each set is positioned at the same radial separation from axis 108 such that the inserts 104 of each set are positioned at a common circumferential path around axis 108.
  • inserts 104 are divided into a first inner set 205 positioned radially innermost at or towards axis 108 and mounted within inner region 203.
  • a second inner set 206 surrounds first set 205 and is mounted at region 202.
  • a first intermediate set 207 surrounds second inner set 206 and is mounted at region 201.
  • a second intermediate set 208 (also mounted at region 201) is positioned radially outside first intermediate set 207 and radially inside the group of gauge inserts 103.
  • each set 205 to 208 comprises the same number of inserts 104 being four inserts per set according to the present embodiment.
  • each insert 104 of each set is configured to collectively define an annular cutting path when bit 100 is rotated through 90° during drilling.
  • the innermost set 205 comprises a single insert 104 that is required to be rotated through 360° to complete a single annular cutting path within the rock.
  • the penetration rate of the present bit 100 is appreciably greater than conventional arrangements and the wear of the inserts is lower and more evenly distributed.
  • First and second intermediate sets 207, 208 comprise inserts 104 having axes that are inclined to taper radially outward from axis 108 consistent with the angled orientation of region 201 (relative to axis 108) within which sets 207, 208 are mounted.
  • inserts 104 within first and second inner sets 205, 206 have axes that are aligned substantially parallel with axis 108.
  • the angle by which the inserts 104 of first and second intermediate sets 207, 208 extend radially outward from axis 108 is less than a corresponding angle by which gauge inserts 103 tilt radially outward from axis 108.
  • each insert 104 of first inner set 205 is separated from axis 108 by the same radial separation distance R1.
  • Each insert 104 of the second inner set 206 is separated from axis 108 by the same radial separation distance R2.
  • Each insert 104 of the first intermediate set 207 is separated from axis 108 by the same radial separation distance R3.
  • Each insert 104 of the second intermediate set 208 is separated from axis 108 by the same radial separation distance R4.
  • R1 ⁇ R2 ⁇ R3 ⁇ R4 is-non uniform according to the present embodiment.
  • an angle by which adjacent inserts 104 (neighbouring in a circumferential direction) are separated is 90° within all sets 205 to 208. That is, the angle between adjacent inserts 104 of each set is uniform and equal over all sets 205 to 208.
  • Such a configuration is advantageous in that the inserts wear consistently at varying radial positions from the axial centre of the bit and the bit penetration rate is maximised.
  • the mounting of the first inner set 205 at platform 204 is advantageous to provide collaring as the inserts of set 205 meet the rock initially during drilling. Such an arrangement is also considered to be beneficial for enhancing penetration speed due to the provision of a local 'lower' level within the rock into which cracks may form during drilling. Additionally, the raised or convex front face 105 having raised innermost region 203 is beneficial to minimise the risk of cracks within head 101 originating from flushing holes 112 extending within head 101.
  • a diameter of inserts 104 of the first inner set 205 is less than a corresponding diameter of second inner set 206.
  • a diameter of the inserts 104 of the first and second inner sets 205, 206 is less than a corresponding diameter of inserts 104 of the first and second intermediate sets 207, 208.
  • a diameter of the gauge inserts 103 is greater than each one of the inner and intermediate inserts 104 of sets 205 to 208.
  • a diameter of inserts 104 over all sets 205 to 208 may be substantially equal or may be smaller or larger than the diameter of gauge inserts 103.
  • the axially forward facing region of head section 111 may be substantially planar (flat) or comprise a concave region defined by an axially forward extending perimeter collar.
  • head 101 may comprise peripheral axially extending flushing channels associated with each flushing hole 112 to facilitate axially rearward transport of the flushing fluid and the rock fragments and fines.
  • head 101 may comprise an additional innermost set of inserts 104 positioned radially within set 205 comprising the same number or less inserts (at the same and common radial position) relative to the radially outer sets 205 to 208. That is, an innermost set of inserts 104 may comprise one, two or three inserts 104 whilst the radially outer sets 205 to 208 may comprise four or more inserts with the inserts 104 of each set positioned at the same radial separation distance R1 to R4 relative to axis 108.

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  • 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)
EP14160500.6A 2014-03-18 2014-03-18 Percussive drill bit with multiple sets of front cutting inserts Withdrawn EP2921639A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP14160500.6A EP2921639A1 (en) 2014-03-18 2014-03-18 Percussive drill bit with multiple sets of front cutting inserts
RU2016140628A RU2671386C2 (ru) 2014-03-18 2015-03-09 Ударное буровое долото с множеством наборов торцевых режущих вставок
KR1020167025105A KR20160133445A (ko) 2014-03-18 2015-03-09 다수 세트의 전방 절삭 인서트들을 가진 타격식 드릴 비트
US15/126,335 US20170081920A1 (en) 2014-03-18 2015-03-09 Percussive drill bit with multiple sets of front cutting inserts
AU2015233739A AU2015233739C1 (en) 2014-03-18 2015-03-09 Percussive drill bit with multiple sets of front cutting inserts
MX2016011966A MX2016011966A (es) 2014-03-18 2015-03-09 Broca de percusion con multiples conjuntos de injertos de corte frontales.
CA2939473A CA2939473A1 (en) 2014-03-18 2015-03-09 Percussive drill bit with multiple sets of front cutting inserts
CN201580011437.8A CN106103879B (zh) 2014-03-18 2015-03-09 具有多组的前切削刀片的冲击钻头
PCT/EP2015/054846 WO2015139989A2 (en) 2014-03-18 2015-03-09 Percussive drill bit with multiple sets of front cutting inserts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14160500.6A EP2921639A1 (en) 2014-03-18 2014-03-18 Percussive drill bit with multiple sets of front cutting inserts

Publications (1)

Publication Number Publication Date
EP2921639A1 true EP2921639A1 (en) 2015-09-23

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ID=50289505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14160500.6A Withdrawn EP2921639A1 (en) 2014-03-18 2014-03-18 Percussive drill bit with multiple sets of front cutting inserts

Country Status (9)

Country Link
US (1) US20170081920A1 (ru)
EP (1) EP2921639A1 (ru)
KR (1) KR20160133445A (ru)
CN (1) CN106103879B (ru)
AU (1) AU2015233739C1 (ru)
CA (1) CA2939473A1 (ru)
MX (1) MX2016011966A (ru)
RU (1) RU2671386C2 (ru)
WO (1) WO2015139989A2 (ru)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018099959A1 (en) * 2016-11-29 2018-06-07 Mincon International Limited Drill bits
EP3760828A1 (en) 2019-07-05 2021-01-06 Sandvik Mining and Construction Tools AB Drill bit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107701111B (zh) * 2017-10-25 2019-06-11 中国石油天然气股份有限公司 切削冲击齿、冲击钻头及其使用方法

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US3357507A (en) 1965-10-24 1967-12-12 Mission Mfg Co Percussion bit
US3382940A (en) * 1965-10-21 1968-05-14 Frank E. Stebley Percussion drill bit
US3388756A (en) 1965-03-29 1968-06-18 Varel Mfg Company Percussion bit
US3738435A (en) * 1971-07-29 1973-06-12 Vorel Mfg Co Vibrating percussion bit
US3955635A (en) 1975-02-03 1976-05-11 Skidmore Sam C Percussion drill bit
US5025875A (en) * 1990-05-07 1991-06-25 Ingersoll-Rand Company Rock bit for a down-the-hole drill
DE3941609C1 (en) * 1989-12-16 1991-10-24 Johannes 4130 Moers De Radtke Boring head for mining - has head and shaft provided with fluid flushing channels and tapering surface on head
WO1994023172A1 (en) * 1993-04-05 1994-10-13 Sds Pty. Ltd. Rotary percussive core drill bit
WO2004111381A1 (en) * 2003-06-12 2004-12-23 Shell Internationale Research Maatschappij B.V. Percussive drill bit
WO2006033606A1 (en) 2004-09-21 2006-03-30 Sandvik Intellectual Property Ab Rock drill bit
US20080078584A1 (en) 2006-09-28 2008-04-03 Atlas Copco Secoroc Ab Bit assembly for down-hole drills
US20080087473A1 (en) 2006-10-13 2008-04-17 Hall David R Percussive Drill Bit
US7392863B2 (en) 2003-12-09 2008-07-01 Sandvik Intellectual Property Ab Rock drill bit
WO2009067073A1 (en) 2007-11-21 2009-05-28 Sandvik Intellectual Property Ab Percussive drill bit for rock drilling and method for the manufacture of such drill bit
EP2383420A1 (en) 2010-04-29 2011-11-02 Sandvik Intellectual Property AB Drill bit for percussive rock drilling
WO2012017460A1 (en) 2010-08-06 2012-02-09 Urbantech S.R.L. An improvement of a supporting structure for an anti-noise barrier wherein foundations and lifting post are realized in a single element and relative assembly method
WO2012038428A1 (en) 2010-09-22 2012-03-29 Sandvik Intellectual Property Ab A rock drill bit for percussive drilling and a rock drill bit button
EP2592216A1 (en) 2011-11-11 2013-05-15 Sandvik Intellectual Property AB Drill bit for rock drilling tool, and rock drilling tool

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US6918455B2 (en) * 1997-06-30 2005-07-19 Smith International Drill bit with large inserts
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AR044551A1 (es) * 2003-05-26 2005-09-21 Shell Int Research Cabeza perforadora con percusion sistema de perforacion que comprende dicha cabeza perforadora y un metodo para perforar un pozo
AR044550A1 (es) * 2003-05-26 2005-09-21 Shell Int Research Cabeza de perforacion y sistema y metodo para perforar un pozo de perforacion en una formacion de tierra
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EP2586960B1 (en) * 2011-10-27 2016-01-13 Sandvik Intellectual Property AB Drill bit having a sunken button and rock drilling tool for use with such a drill bit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3388756A (en) 1965-03-29 1968-06-18 Varel Mfg Company Percussion bit
US3382940A (en) * 1965-10-21 1968-05-14 Frank E. Stebley Percussion drill bit
US3357507A (en) 1965-10-24 1967-12-12 Mission Mfg Co Percussion bit
US3738435A (en) * 1971-07-29 1973-06-12 Vorel Mfg Co Vibrating percussion bit
US3955635A (en) 1975-02-03 1976-05-11 Skidmore Sam C Percussion drill bit
DE3941609C1 (en) * 1989-12-16 1991-10-24 Johannes 4130 Moers De Radtke Boring head for mining - has head and shaft provided with fluid flushing channels and tapering surface on head
US5025875A (en) * 1990-05-07 1991-06-25 Ingersoll-Rand Company Rock bit for a down-the-hole drill
WO1994023172A1 (en) * 1993-04-05 1994-10-13 Sds Pty. Ltd. Rotary percussive core drill bit
WO2004111381A1 (en) * 2003-06-12 2004-12-23 Shell Internationale Research Maatschappij B.V. Percussive drill bit
US7392863B2 (en) 2003-12-09 2008-07-01 Sandvik Intellectual Property Ab Rock drill bit
WO2006033606A1 (en) 2004-09-21 2006-03-30 Sandvik Intellectual Property Ab Rock drill bit
US20080078584A1 (en) 2006-09-28 2008-04-03 Atlas Copco Secoroc Ab Bit assembly for down-hole drills
US20080087473A1 (en) 2006-10-13 2008-04-17 Hall David R Percussive Drill Bit
US7527110B2 (en) 2006-10-13 2009-05-05 Hall David R Percussive drill bit
WO2009067073A1 (en) 2007-11-21 2009-05-28 Sandvik Intellectual Property Ab Percussive drill bit for rock drilling and method for the manufacture of such drill bit
EP2383420A1 (en) 2010-04-29 2011-11-02 Sandvik Intellectual Property AB Drill bit for percussive rock drilling
WO2012017460A1 (en) 2010-08-06 2012-02-09 Urbantech S.R.L. An improvement of a supporting structure for an anti-noise barrier wherein foundations and lifting post are realized in a single element and relative assembly method
WO2012038428A1 (en) 2010-09-22 2012-03-29 Sandvik Intellectual Property Ab A rock drill bit for percussive drilling and a rock drill bit button
EP2592216A1 (en) 2011-11-11 2013-05-15 Sandvik Intellectual Property AB Drill bit for rock drilling tool, and rock drilling tool

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018099959A1 (en) * 2016-11-29 2018-06-07 Mincon International Limited Drill bits
CN110192000A (zh) * 2016-11-29 2019-08-30 敏康国际有限公司 钻头
US11111729B2 (en) 2016-11-29 2021-09-07 Mincon International Limited Multi-indenter hammer drill bits and method of fabricating
EP3760828A1 (en) 2019-07-05 2021-01-06 Sandvik Mining and Construction Tools AB Drill bit
EP3760828B1 (en) 2019-07-05 2022-04-20 Sandvik Mining and Construction Tools AB Drill bit

Also Published As

Publication number Publication date
CN106103879B (zh) 2019-07-26
US20170081920A1 (en) 2017-03-23
CA2939473A1 (en) 2015-09-24
AU2015233739C1 (en) 2018-11-22
RU2671386C2 (ru) 2018-10-30
CN106103879A (zh) 2016-11-09
WO2015139989A3 (en) 2016-01-21
RU2016140628A (ru) 2018-04-18
AU2015233739A1 (en) 2016-09-01
KR20160133445A (ko) 2016-11-22
AU2015233739B2 (en) 2018-08-02
RU2016140628A3 (ru) 2018-07-02
WO2015139989A2 (en) 2015-09-24
MX2016011966A (es) 2016-12-15

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