AU2007200717A1 - Drilling head - Google Patents
Drilling head Download PDFInfo
- Publication number
- AU2007200717A1 AU2007200717A1 AU2007200717A AU2007200717A AU2007200717A1 AU 2007200717 A1 AU2007200717 A1 AU 2007200717A1 AU 2007200717 A AU2007200717 A AU 2007200717A AU 2007200717 A AU2007200717 A AU 2007200717A AU 2007200717 A1 AU2007200717 A1 AU 2007200717A1
- Authority
- AU
- Australia
- Prior art keywords
- drilling
- drilling head
- support members
- hard material
- head
- 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
- 238000005553 drilling Methods 0.000 title claims description 63
- 239000000463 material Substances 0.000 claims description 23
- 230000009467 reduction Effects 0.000 claims description 2
- 239000011435 rock Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000008237 rinsing water Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
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)
Description
-1-
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
Name of Applicant/s: Actual Inventor/s: Address for Service is: Hilti Aktiengesellschaft Kay Heemann and Wolfgang Ludwig and Michael Bayerl SHELSTON IP Margaret Street SYDNEY NSW 2000 CCN: 3710000352 Attorney Code: SW Telephone No: Facsimile No.
(02) 9777 1111 (02) 9241 4666 Invention Title: DRILLING HEAD The following statement is a full description of this invention, including the best method of performing it known to me/us:- File: 53196AUP00 501098653 1.DOC/5844 DRILLING HEAD BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forked drilling head for rock materials and, in particular, for an injection self-drilling anchor.
2. Description of the Prior Art Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.
Forked drilling heads (also known as two-prong drilling heads or fish-tail drilling heads) are characterized by a high drilling capacity in a comparative soft rock material, when drilling the cap rock when mining the coal semi-coke.
Such mass-produced drilling heads, to which the present invention is limited, have, at a drilling diameter between 25mm and 60mm, a small degree of complexity. So the number of separate parts, such as hard material inserts that form cutters, is limited, for manufacturing reasons, to a small number, maximum to five parts. When the drilling head is used as a onetime usable injection self-drilling anchor, with an anchor-serving tubular stem of the drilling head being glued to a bore wall with a twin-component resin mortar, the retaining of the dimensional accuracy of the bore cross-sectional dimension becomes of a very high importance. This is because it is the cross-sectional dimension that determines the strength of the annular channel that is filled with the twin-component resin mortar.
According to International Publication WO 8901086 and German Publication DE 41 34 425, a forked rock drilling head, which is equipped with hard material, has at its head side, two diametrically opposite, radially and circumferentially freely extending, prong-shaped support members, with a hard metal cutting element brazed to each of the support members. At the base between the support members, there is located an opening of a rinsing bore extending coaxially with the drilling axis. However, with two separate hard metal cutting elements, it is difficult to realize a bore with a cross-sectional dimension within narrow tolerance limits because the cutting elements can be displaced relative to each other during brazing. In addition, during brazing, the hard metal cutting elements are secured to the respective support members separately.
German Publication DE 34 36 128 discloses a pot-shaped drilling head for drilling bores for injection self-drilling anchors and equipped with a single, diametrically extending, hard metal plate. The hard metal plate, which has two diametrically opposite cutting edges, is supported by the drilling head along its entire axial length. The drawback of this drilling head, in comparison with the forked drilling heads, consists in its small drilling capacity during drilling of bores in gallery roofs of coal mines.
It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
SUMMARY OF THE INVENTION Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".
According to the invention, there is provided a drilling head having a drilling axis and a cross-sectional dimension in a direction normal to the drilling axis, the drilling head comprising, at a head side thereof, two diametrically opposite, free-standing, prong-shaped support members; and a diametrically extending hard material element connected with the two support members, forming at least one cutter at a head, in an axial direction, side thereof, and lying freely in a central region of the drilling axis at a stem, in the axial direction, side thereof.
The diametrically extending hard material element itself defines the dimensional accuracy of the bore cross-sectional dimension, so that the dimensional accuracy does not depend on exact fixing of the hard material element on the support members during the assembly of the drilling head.
Preferably, there is formed at a bottom, which is formed between the two support members, at the head, in the axial direction, side of the drilling head, an opening of a rinsing bore coaxial with the drilling axis. Thereby, the central part of the hard material element, which lies freely in the central region of the drilling axis and which becomes very hot during the drilling process, is directly cooled by the rinsing water. As a result, a smaller portion of heat should be removed from the area that connects the hard material element with the support members and which has a heat transition coefficient. This increases the usable life of the drilling head.
Preferably, a diametrical free space between the two support members amounts to at least a fifth of the cross-sectional dimension of the drilling head. Thereby, a high drilling capacity is reached when drilling the relative soft rock material such as cap rock that prevails in mines with coal semi-coke. In addition, the opening cross-section is sufficiently large for wet drilling with a low water pressure from 5 to 30 bar.
Preferably, the hard material element is connected with the support members in materiallocking manner being integral with each other), is brazed, which provides for a connection capable to withstand high loads.
Preferably, the hard material element is formed as a thin hard material plate with a thickness of less than a tenth of the cross-sectional dimension of the bit.
Thereby, the bending stiffness of the hard material element, which is proportional to a cube of thickness, is sufficiently low to prevent any damage of the connection from bending vibrations of the support members caused by drilling.
Preferably, the hard material element has a thickness reduction in the radial region of the drilling axis, arcuate notches provided on opposite sides. Thereby, this hinge region has a particular low bending stiffness.
The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages thereof, will be best understood from the following detailed description of a preferred embodiment, when read with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS: A preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings in which: Fig. 1 a longitudinal cross-sectional view of a drilling head according to the present invention along line I-I in Fig. 2; and Fig. 2 a plan view of the drilling head shown in Fig. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A forked drilling head 1 according to the present invention, which is shown in Figs. 1-2, has a drilling axis A, a cross-sectional dimension in a direction normal to the drilling axis A, of 60 mm, and two diametrically opposite, with respect to the drilling axis A, radially and circumferentially free-standing prong-shaped support members 2. Both supports are brazed, respectively, with a single, diametrically extending hard material element 3 which forms, at its head, in the axial direction, side two cutters 4. The hard material element 3 lies freely at its stem side, in the central region Z of the drilling axis A. At the head in the axial directionside, bottom of the drilling head 1, which is formed between the two support members 2, there is provided an opening 5 of a rinsing bore 6 coaxial with the drilling axis A. A diametrically extending free space F between the two support members 2 of 20 mm amounts to a third of the cross-sectional dimension. The hard material element 3 is formed as a thin hard material plate having a thickness D of 3mm, one twentieth of the cross-sectional dimension E, and having an arcuate notch 7 on each of its sides in the radial region R of the drilling axis A.
Accordingly, it is an advantage of a preferred embodiment of the present invention to provide a forked drilling head suitable for mass production.
Another advantage of a preferred embodiment of the present invention is to provide a forked drilling head capable of maintaining a high dimensional accuracy of a bore cross-width.
Though the present invention was shown and described with references to the preferred embodiment, such is merely illustrative of the present invention and is not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is therefore not intended that the present invention be limited to the disclosed embodiment or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
Claims (5)
- 2. A drilling head according to claim 1, comprising at a bottom formed between the two support members at the head, in the axial direction, side of the drilling head, an opening of a rinsing bore coaxial with the drilling axis.
- 3. A drilling head according to claim 1 or claim 2, wherein a diametrical free space between the two support members amounts to at least a fifth of the cross-sectional dimension.
- 4. A drilling head according to any one of the preceding claims, wherein the hard material element is connected with the support members in a material-locking manner. A drilling head according to any one of the preceding claims, wherein the hard material element is formed as a thin hard material plate having a thickness less than a tenth of the cross-sectional dimension.
- 6. A drilling head according to any one of the preceding claims, wherein the hard o material element has a reduction of thickness in a radial region of the drilling axis.
- 7. A drilling head substantially as herein described with reference to any one of the embodiments of the invention illustrated in the accompanying drawings and/or examples.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006000085A DE102006000085B3 (en) | 2006-02-21 | 2006-02-21 | wellhead |
DE102006000085.4 | 2006-02-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
AU2007200717A1 true AU2007200717A1 (en) | 2007-09-06 |
Family
ID=38427006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2007200717A Abandoned AU2007200717A1 (en) | 2006-02-21 | 2007-02-19 | Drilling head |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070193783A1 (en) |
AU (1) | AU2007200717A1 (en) |
DE (1) | DE102006000085B3 (en) |
NZ (1) | NZ553269A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103225480B (en) * | 2013-03-28 | 2015-06-17 | 乐山天威机械制造有限公司 | Heavy hammer for excavating rock formation and welding processing method |
CN110485932A (en) * | 2019-08-30 | 2019-11-22 | 中国建筑西南勘察设计研究院有限公司 | A kind of drill bit for anchor pole of constructing |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US496253A (en) * | 1893-04-25 | Boring-tool | ||
US4515230A (en) * | 1982-10-25 | 1985-05-07 | Fansteel Inc. | Roof drill bit |
US4489796A (en) * | 1983-05-25 | 1984-12-25 | Gte Laboratories Incorporated | Insert for a mine tool roof bit and a method of drilling therewith |
CA1220059A (en) * | 1983-10-03 | 1987-04-07 | Edmund Isakov | Two-prong rotary bit, especially for use with roof drills, and insert therefor |
US4550791A (en) * | 1983-10-03 | 1985-11-05 | Kennametal Inc. | Two-prong rotary bit, especially for use with roof drills, and insert therefor |
WO1989001086A1 (en) * | 1987-07-23 | 1989-02-09 | Kennametal Inc. | Masonry two-prong rotary drill bit |
DE4134425A1 (en) * | 1991-10-18 | 1993-04-22 | Boart Hwf Gmbh Co Kg | Rotary drilling head with cutter supports - has hard metal cutters welded to twin holders and supported at back and underneath |
US5311959A (en) * | 1992-04-13 | 1994-05-17 | Gte Valenite Corporation | Mine tool roof bit insert |
DE29721790U1 (en) * | 1997-12-10 | 1998-02-19 | Gebrüder Heller Dinklage GmbH, 49413 Dinklage | Drill bit receiving drill |
US6968912B2 (en) * | 2002-12-12 | 2005-11-29 | The Sollami Company | Drill blades for drill bit |
AU2003203447B2 (en) * | 2003-03-28 | 2008-10-30 | Sandvik Intellectual Property Ab | Drill Bit |
US7168511B2 (en) * | 2004-09-24 | 2007-01-30 | Kennametal Inc. | Rotary drill bit having cutting insert with a notch |
-
2006
- 2006-02-21 DE DE102006000085A patent/DE102006000085B3/en not_active Expired - Fee Related
-
2007
- 2007-02-16 NZ NZ553269A patent/NZ553269A/en not_active IP Right Cessation
- 2007-02-19 AU AU2007200717A patent/AU2007200717A1/en not_active Abandoned
- 2007-02-20 US US11/709,178 patent/US20070193783A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20070193783A1 (en) | 2007-08-23 |
DE102006000085B3 (en) | 2007-10-11 |
NZ553269A (en) | 2007-11-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |