US20070209842A1 - Hard material bit - Google Patents
Hard material bit Download PDFInfo
- 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
Links
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000005520 cutting process Methods 0.000 claims abstract description 58
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 description 7
- 238000005219 brazing Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10391672B2 (en) * | 2015-10-22 | 2019-08-27 | Robert Bosch Gmbh | Drilling tool |
Citations (10)
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 |
-
2006
- 2006-03-06 DE DE102006000108A patent/DE102006000108A1/de not_active Withdrawn
-
2007
- 2007-02-19 NZ NZ553275A patent/NZ553275A/en not_active IP Right Cessation
- 2007-02-19 AU AU2007200718A patent/AU2007200718A1/en not_active Abandoned
- 2007-03-05 US US11/714,470 patent/US20070209842A1/en not_active Abandoned
Patent Citations (10)
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)
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 |