AU715044B2 - Borers - Google Patents
Borers Download PDFInfo
- Publication number
- AU715044B2 AU715044B2 AU75366/96A AU7536696A AU715044B2 AU 715044 B2 AU715044 B2 AU 715044B2 AU 75366/96 A AU75366/96 A AU 75366/96A AU 7536696 A AU7536696 A AU 7536696A AU 715044 B2 AU715044 B2 AU 715044B2
- Authority
- AU
- Australia
- Prior art keywords
- borer
- pcd
- working end
- cutting elements
- borer according
- 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.)
- Ceased
Links
- 239000000463 material Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 229940072033 potash Drugs 0.000 claims description 3
- 235000015320 potassium carbonate Nutrition 0.000 claims description 3
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- -1 hard sandstone Substances 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000005065 mining Methods 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
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
- E21B10/5673—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a non planar or non circular cutting face
-
- 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)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Drilling Tools (AREA)
Description
AUSTRALIA
PATENTS ACT 1990 COMPLETE
SPECIFICATION
NAME OF APPLICANT(S): Amic Industries Limited ADDRESS FOR SERVICE: DAVIES COLLISON
CAVE
Patent Attorneys 1 Little Collins Street, Melbourne, 3000.
INVENTION
TITLE:
Borers The following statement is a full description of this invention, including the best method of performing it known to me/us:-
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2 BACKGROUND OF THE INVENTION This invention relates to borers, particularly borers for drilling roof bolt holes.
One type of borer for producing such holes comprises a cylindrical body having a working end and an opposite end provided with a threaded projection for engaging in a suitable drill. The working end has two opposed PCD (polycrystalline diamond) cutting elements, each of which presents a rounded cutting edge for the borer. Each PCD cutting element consists of a layer of PCD bonded to a cemented carbide backing and is disc-shaped.
0. A disadvantage of this existing borer is that the curved side edges of the PCD cutting elements wear relatively quickly resulting in hole diameter decreasing as the borer wears.
Another lknown borer consists of a cylindrical body having a working end and an opposite female threaded end adapted to receive a drill rod. The working end has two spaced cemented carbide cutting elements, each of which presents a pointed cutting tip. The cemented carbide cutting elements wear rapidly, particularly where the roof is a hard sandstone or similar material as is sometimes encountered in the mining industry.
0o P:\OPER\SSB\75366-96. RES 12/11/99 -3- SUMMARY OF THE INVENTION The invention provides a borer, comprising a cylindrical body having a working end and an opposite end adapted to be connected to a drill, the working end comprising at least two opposed PCD cutting elements, each of which presents an upper curved cutting edge and a straight or substantially straight, outer edge adapted to act as a gauge edge for the borer.
Preferably, the cylindrical body is provided with cutaways below each cutting element adapted to receive chips and other debris produced during use of the borer.
Preferably, the borer has at least one hole extending through the body and opening between the cutting elements and adapted to allow flushing fluid to pass therethrough. The hole is preferably centrally or substantially centrally located through the body.
According to another aspect of the invention, there is provided a method of producing a hole 20 in a hard material including the steps of providing a borer as described above, rotating the borer and advancing the borer into the material. The material will typically be a rock such as hard sandstone, or potash or coal. The hole may be one which is adapted to receive a roof bolt.
C
4 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of an embodiment of the invention, Figure 2 is a side view of Figure 1, Figure 3 is a plan view of Figure 1, Figure 4 is a plan view of a PCD disc out of which a cutting element useful in a borer of the invention may be produced, and Figures 5 to 9 are plan views of PCD discs in which alternative cutting elements useful in a borer of the invention may be produced.
DESCRIPTION OF EMBODIMENTS The PCD cutting element preferably comprises a layer of PCD bonded to a cemented carbide substrate. The cemented carbide substrate will be bonded to the working end of the body, preferably by brazing. The PCD cutting element will typically be located in a suitably shaped recess in the working end.
The PCD cutting element may be any known in the art and as are commercially available. Examples of such cutting elements are Syndite®, Syndrill® and Compax®.
An embodiment of the invention will now be described with reference to the accompanying drawings. Referring to Figures 1 to 3, there is shown a borer for producing holes in a hard material such as rock, e.g. hard sandstone, or potash or coal suitable for receiving a roof bolt. The borer comprises a .I cylindrical body 10 having a working end 12 and an opposite end 14. The opposite end 14 is provided with a threaded projection 16 adapted to be received by a complementally threaded drill rod.
S S..
The working end 14 comprises two identical PCD cutting elements 18. Each cutting element 18 comprises a PCD layer 20 bonded to a cemented carbide substrate 22. Each cutting element presents an upper curved cutting edge 24 and a straight outer side edge 26.
The cylindrical body 10 is provided with a cutaway 28 below each cutting element. The cutaways 28 extend down a substantial portion of the length of the body 10 and provide a means for receiving and flushing away chips and other debris produced during use of the borer.
Each cutting element is located in a recess 30 formed in the working end 14 of the body 10. In use, the borer is rotated in the direction of the arrow A.
It will be noted that the recess 30 is inclined away from the vertical in the direction of rotation providing the front face of the PCD layer 20 leading to the cutting edge 24 with a negative rake angle of typically 5 300 and preferably approximately 15' This, it has been found, is a particularly effective angle for the cutting elements.
In use, the borer is fitted to a drill in the usual way and rotated at high speed and advanced into the rock. The curved cutting edge 24 provides the working edge for the borer while the straight outer side edges 26 provide *gauge edges for the borer. It has been found that the edges 26 do not wear rapidly ensuring that holes of uniform diameter are formed.
PCD, backed by cemented carbide or otherwise, is produced and sold in the form of a disc. Cutting inserts suitable for the borer of the invention may i be produced from PCD discs, as illustrated by Figures 4 and 5. Referring 6 to these drawings, a cutting element,as used in the embodiment of Figures 1 to 3 may be cut from the disc, as shown by dotted lines in Figure 4.
Alternatively, two cutting elements may be cut from a single disc if the disc is cut in the manner illustrated by dotted lines in Figure 5. The cutting elements cut from the Figure 5 embodiment provide an elongate edge 32 which will provide the outer gauge edge for the element. In all cases, part of the outside of the disc provides the curved cutting edge 24, thereby saving on cutting and chamfering.
Figures 6 to 9 show alternative ways of cutting two cutting elements from a single disc. In each case an elongate edge 32 will provide the outer gauge edge for the element.
It is the nature of PCD to chip from sharp edges and corners. Such chipping reduces in-service life. Thus, after cutting from the disc, it is preferred that corners are rounded, typically to a radius of approximately 1-3mm. Edges on the PCD are preferably chamfered to approximately 0,5 -1,0mm x 45 The large radius on the curved cutting edge 24 prevents chipping in this area.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be S. understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
Claims (19)
1. A borer comprises a cylindrical body having a working end and an opposite end adapted to be connected to a drill, the working end comprising at least two opposed PCD cutting elements, each of which presents an upper curved cutting edge and a straight or substantially straight, outer edge adapted to act as a gauge edge for the borer.
2. A borer according to claim 1 wherein the cylindrical body is provided with cutaways below each cutting element adapted to receive chips and other debris produced during use of the borer.
3. A borer according to claim 1 or claim 2 having at least one hole extending through the cylindrical body, and opening between the cutting elements and :.::adapted to allow flushing fluid to pass therethrough.
4. A borer according to claim 3 wherein the hole is centrally or substantially centrally located through the body.
A borer according to any one of the preceding claims wherein the face of each PCD cutting element leading to the cutting edge is located in the working end at a negative rake angle. 8
6. A borer according to claim 5 wherein the rake angle is 5 to
7. A borer according to claim 5 wherein the rake angle is approximately
8. A borer according to any one of the preceding claims wherein the PCD cutting elements are located in recesses formed in the working end of the cylindrical body.
9. A borer according to any one of the preceding claims wherein the PCD cutting elements comprise a layer of PCD bonded to a cemented carbide substrate.
A borer according to claim 9 wherein the cemented carbide substrate is brazed to the working end of the body.
11. A borer according to any one of the preceding claims wherein the PCD cutting elements are produced from a single disc.
12. A borer according to any one of the preceding claims wherein the edges are chamfered. 9
13. A borer according to claim 12 wherein the chamfered edges are chamfered to approximately 0,5 1,0mm x
14. A method of producing a hole in hard material includes the steps of providing a borer according to any one of the preceding claims, rotating the borer and advancing the borer into the material. A method according to claim 14, as appended to anyone of claims 3 to 13, wherein the hole is adapted to receive a roof bolt.
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16. A method according to claim 14 or claim 15 wherein the hard material is C. 'rock, potash or coal.
17. A borer according to claim 1 and substantially as herein described with reference to any one of Figures 1 to 9 of the accompanying drawings.
18. A method according to claim 14 and substantially as herein described with reference to any one of Figures 1 to 9 of the accompanying drawings. P: \OPER\SSB\75366.6RES 12/11/99
19. A borer substantially as hereinbefore described with reference to the accompanying drawings. DATED this 12th day of November 1999 AMIC INDUSTRIES LIMITED By its Patent Attorneys DAVIES COLLISON CAVE 9 a a awe. a. a. a a C a. S a a 9 C a.. C a a a C C a a. a a C
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA9510842 | 1995-12-20 | ||
| ZA95/10842 | 1995-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU7536696A AU7536696A (en) | 1997-06-26 |
| AU715044B2 true AU715044B2 (en) | 2000-01-13 |
Family
ID=25585471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU75366/96A Ceased AU715044B2 (en) | 1995-12-20 | 1996-12-17 | Borers |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU715044B2 (en) |
| DE (1) | DE19652208A1 (en) |
| PL (1) | PL181563B1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5996714A (en) * | 1997-07-15 | 1999-12-07 | Kennametal Inc. | Rotatable cutting bit assembly with wedge-lock retention assembly |
| DE19854113C2 (en) * | 1998-11-24 | 2003-08-28 | Friedrich Neher | Milling tool for processing stone or stone-like materials |
| DE20016941U1 (en) | 2000-09-30 | 2000-12-21 | Gerätebau Wiedtal Schützeichel KG, 53577 Neustadt | Full drill |
| DE10151802B4 (en) * | 2001-10-19 | 2006-05-04 | Cedima Diamantwerkzeug- Und Maschinenhandelsgesellschaft Mbh | Method for producing an abrasive element for drill bits of hollow drills |
| DE102007054601A1 (en) | 2007-11-15 | 2009-05-20 | WIKUS-Sägenfabrik Wilhelm H. Kullmann GmbH & Co. KG | Saw blade with a basic body and teeth with cutting edges |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4515230A (en) * | 1982-10-25 | 1985-05-07 | Fansteel Inc. | Roof drill bit |
| AU4147793A (en) * | 1992-08-26 | 1994-03-03 | Kennametal Inc. | Cutting bit and cutting insert |
| US5655612A (en) * | 1992-01-31 | 1997-08-12 | Baker Hughes Inc. | Earth-boring bit with shear cutting gage |
-
1996
- 1996-12-16 DE DE19652208A patent/DE19652208A1/en not_active Withdrawn
- 1996-12-17 AU AU75366/96A patent/AU715044B2/en not_active Ceased
- 1996-12-19 PL PL96317598A patent/PL181563B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4515230A (en) * | 1982-10-25 | 1985-05-07 | Fansteel Inc. | Roof drill bit |
| US5655612A (en) * | 1992-01-31 | 1997-08-12 | Baker Hughes Inc. | Earth-boring bit with shear cutting gage |
| AU4147793A (en) * | 1992-08-26 | 1994-03-03 | Kennametal Inc. | Cutting bit and cutting insert |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7536696A (en) | 1997-06-26 |
| DE19652208A1 (en) | 1997-06-26 |
| PL181563B1 (en) | 2001-08-31 |
| PL317598A1 (en) | 1997-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |