US20070209842A1 - Hard material bit - Google Patents

Hard material bit Download PDF

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Publication number
US20070209842A1
US20070209842A1 US11/714,470 US71447007A US2007209842A1 US 20070209842 A1 US20070209842 A1 US 20070209842A1 US 71447007 A US71447007 A US 71447007A US 2007209842 A1 US2007209842 A1 US 2007209842A1
Authority
US
United States
Prior art keywords
cutting edges
hard material
bit
cutting
material bit
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.)
Abandoned
Application number
US11/714,470
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English (en)
Inventor
Kay Heemann
Wolfgang Ludwig
Michael Bayerl
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
Assigned to HILTI AKTIENGESELLSCHAFT reassignment HILTI AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAYERL, MICHAEL, HEEMANN, KAY, LUDWIG, WOLFGANG
Publication of US20070209842A1 publication Critical patent/US20070209842A1/en
Abandoned 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/58—Chisel-type inserts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0053—Anchoring-bolts in the form of lost drilling rods

Definitions

  • the present invention relates to a chisel-shaped hard material bit for a rock drilling head, in particular, for an injection self-drilling anchor.
  • Such mass-produced drilling heads have, at a width across comers between 25 and 60 mm, a low degree of complexity. Because injection self-drilling anchors are needed in large quantities, their effective and material-saving manufacturing become of great importance.
  • Chisel-shaped hard material bits are usually formed as hard material plates with two cutters diametrically arranged relative to each other in a gable-shaped manner.
  • the powder is compressed in a press-mold under a high pressure in a direction normal to side surfaces.
  • a hydrodynamic pressure distribution takes place in the powder which gives the hard material plate its geometry.
  • the flow processes greatly affect the homogeneity of the powder distribution and, thereby, the quality of a produced sintered component, in particular, in the edge regions, which form in the hard material plate which are used as chisel-shaped hard material bits, the highly stressed cutting edges.
  • the not sufficiently dense or not completely formed cutting edges lead to formation of crack-initiating notches. Therefore, the geometry of the hard material plate, which is obtained as a result of a flow process during pressing of blanks, greatly influences the usable life of the produced hard material bit.
  • German Publication DE 28 02 119 discloses a drilling head with a brazed plate-shaped hard material insert that forms a chisel-shaped bit.
  • a base surface that is located opposite the centrally arranged cutting edge, is formed of two, inclined toward each sections which are connected with the side surfaces of the bit by rounded transition regions.
  • U.S. Pat. No. 5,464,068 discloses a drilling head including a hard material cutting plate formed of a CVD-diamond, having a small height and two cutting edges extending at angle to each other, forming a gable-shaped profile, with a concave base surface extending transverse to the side surfaces.
  • British Patent No. 971,971 discloses a thick hard material cutting plate the base surface of which is beveled at both sides and the central cutting edge of which has on each of its opposite sides a concave trough, whereby the cutting plate becomes thinner in the cutting edge region.
  • U.S. Pat. No. 4,489,798 discloses a thin hard material cutting plate (the thickness amounts to tenths of the length) having along its longitudinal extent two cutting edges arranged in a gable-shaped manner relative to each other, and having different side surfaces and also side cutting edges.
  • An object of the present invention is to provide a chisel-shaped hard material bit formed of a sintered material and which would insure saving of material during its manufacturing and an extended service life of the drilling head in which the hard material bit is used.
  • a hard material bit including at least two cutting edges over a bit length in a direction transverse to a bit drilling axis, a first side surface and a second side surface spaced from the first side surface by a thickness of the bit, with one of the at least two cutting edges being located adjacent to the first side surface and another of the at least two cutting edges being located adjacent to the second side surface, a base surface located opposite the cutting edges at a height along the drilling axis, and two recesses formed in respective longitudinal portions of the base surface located opposite the one of the at least two cutting edges and the another of the at least two cutting edges, respectively, and extending up to the first and second side surfaces, respectively.
  • the cutting edges are formed directly on the side surfaces, which makes them particularly sharp.
  • the recess volume (measured with respect to a base brazing surface extending transverse to the side surface) amounts to between a half and a double of, advantageously, to a single of a cutting volume (measured with respect to a counter-edge brazing surface).
  • a cross-section across a middle portion of a cutting edge has essentially a shape of a parallelogram limited by the two, parallel to each other side surfaces and by likewise parallel, cutting surface and base surface both of which extend, respectively, at an acute free angle to a horizontal. Because a parallelogram, as known, is formed by shearing of a rectangle, during the flow process, homogeneously distributed infinitesimal shear deformation are sufficient for a complete filling of the cross-section, without an extended transportation of powder.
  • both the thickness and the height amounts to less than a third, advantageously, to a fourth of the bit length, which permits to form a material-saving bit.
  • reduction of the cross-section increases the flexibility of the hard material bit along its length that defines a bore cross-width.
  • a low height of the hard material bit reduces the latent stress within the brazing layer, which is produced, during brazing of the bit with the drilling head, as a result of different expansion coefficients. Thereby, the loading capability of the hard material bit and the drilling head increases.
  • the base surface is formed as a concave surface over its length, whereby with the cutting edges forming a gable-shaped structure along the bit length, an angular hard material bit with a reduced central height is formed, which further contributes to saving of a material.
  • the recesses are limited in the longitudinal direction at their opposite sides.
  • a shear component in a direction of a side cutting edge which must have, in injection self-drilling anchors in particular, a long service life for retaining the dimensional accuracy of the bore cross-width.
  • an inventive hard material bit is used in drilling heads of injection self-drilling anchors. Because such anchors are mass-produced, the bit proved to be particularly effective in such one-time usable products, permitting a big saving of material.
  • FIG. 1 a side view of a hard material bit according to the present invention as viewed from plane I-I in FIG. 2 ;
  • FIG. 2 a cross-sectional view through a middle portion of a cutting edge along plane I-I in FIG. 1 .
  • FIG. 1 shows a chisel-shaped hard material bit 1 for a forked drilling head 2 which is shown in FIG. 1 schematically with dash lines and is designed for use with an injection self-drilling anchor 3 .
  • the bit 1 has, over its length L of 60 mm and measured in a direction perpendicular to its drilling axis A, two cutting edges 4 a and 4 b arranged in a gable-shaped manner.
  • the cutting edges 4 a and 4 b are formed on different, spaced by a thickness D of 3 mm, side surfaces 5 a , 5 b .
  • Each of respective cutting edges 4 a , 4 b is associated with a recess 7 a , 7 b formed in an opposite longitudinal portion of a base surface 6 of the bit 1 at a height of 8 mm from the cutting edge 4 a , 4 b .
  • the recess 7 a , 7 b is limited at its opposite sides and extends precisely up to the side surface 5 a , 5 b that forms the cutting edge 4 a , 4 b .
  • the base surface 6 itself is formed along its length L as a concave surface.
  • the cutting edges 4 a , 4 b pass on the respective side surfaces 5 a , 5 b into respective side cutting edges 11 a , 11 b.
  • the recess volume VA measured with respect to a basic brazing surface 8 which extends transverse to the side surface 5 a
  • the cutting edge volume VS measured with respect to an opposite edge brazing surface 9 likewise extending transverse to the side surface 5 a
  • the cross-section itself has a shape of essentially a parallelogram limited by the parallel to each other side surfaces 5 a , 5 b and by likewise parallel to each other cutting surface 10 and the base surface 6 that extend at an acute free angle ⁇ .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US11/714,470 2006-03-06 2007-03-05 Hard material bit Abandoned US20070209842A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006000108.7 2006-03-06
DE102006000108A DE102006000108A1 (de) 2006-03-06 2006-03-06 Hartstoffschneide

Publications (1)

Publication Number Publication Date
US20070209842A1 true US20070209842A1 (en) 2007-09-13

Family

ID=38335780

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/714,470 Abandoned US20070209842A1 (en) 2006-03-06 2007-03-05 Hard material bit

Country Status (4)

Country Link
US (1) US20070209842A1 (de)
AU (1) AU2007200718A1 (de)
DE (1) DE102006000108A1 (de)
NZ (1) NZ553275A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10391672B2 (en) * 2015-10-22 2019-08-27 Robert Bosch Gmbh Drilling tool

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160616A (en) * 1977-10-03 1979-07-10 Winblad Michael E Drill containing minimum cutting material
US4190127A (en) * 1977-01-20 1980-02-26 Wolf Isaac M Brazing inserts
US4633959A (en) * 1985-06-26 1987-01-06 Vermont American Corporation Drill having means for locating cutting bit in a bit holder
US4688652A (en) * 1981-03-27 1987-08-25 Kennametal Inc. Braze fixtures for use in drilling tools
US5184689A (en) * 1991-03-06 1993-02-09 Kennametal Inc. Radial cut drill bit insert
US5464068A (en) * 1992-11-24 1995-11-07 Najafi-Sani; Mohammad Drill bits
US5735648A (en) * 1994-11-28 1998-04-07 Hilti Aktiengesellschaft Tool bit with carrier member and cutting member
US6684968B2 (en) * 2001-06-25 2004-02-03 Kennametal Inc. Roof bit body and insert assembly
US20040027206A1 (en) * 2002-04-07 2004-02-12 Dave Colleran Automatic phase lock loop design using geometric programming
US20060065446A1 (en) * 2004-09-24 2006-03-30 Woods Gerald L Rotary drill bit having cutting insert with a notch

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190127A (en) * 1977-01-20 1980-02-26 Wolf Isaac M Brazing inserts
US4160616A (en) * 1977-10-03 1979-07-10 Winblad Michael E Drill containing minimum cutting material
US4688652A (en) * 1981-03-27 1987-08-25 Kennametal Inc. Braze fixtures for use in drilling tools
US4633959A (en) * 1985-06-26 1987-01-06 Vermont American Corporation Drill having means for locating cutting bit in a bit holder
US5184689A (en) * 1991-03-06 1993-02-09 Kennametal Inc. Radial cut drill bit insert
US5464068A (en) * 1992-11-24 1995-11-07 Najafi-Sani; Mohammad Drill bits
US5735648A (en) * 1994-11-28 1998-04-07 Hilti Aktiengesellschaft Tool bit with carrier member and cutting member
US6684968B2 (en) * 2001-06-25 2004-02-03 Kennametal Inc. Roof bit body and insert assembly
US20040027206A1 (en) * 2002-04-07 2004-02-12 Dave Colleran Automatic phase lock loop design using geometric programming
US20060065446A1 (en) * 2004-09-24 2006-03-30 Woods Gerald L Rotary drill bit having cutting insert with a notch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10391672B2 (en) * 2015-10-22 2019-08-27 Robert Bosch Gmbh Drilling tool

Also Published As

Publication number Publication date
DE102006000108A1 (de) 2007-09-13
AU2007200718A1 (en) 2007-09-20
NZ553275A (en) 2007-11-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HILTI AKTIENGESELLSCHAFT, LIECHTENSTEIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEEMANN, KAY;LUDWIG, WOLFGANG;BAYERL, MICHAEL;REEL/FRAME:019205/0539

Effective date: 20070312

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION