WO1997019247A1 - Bohrkrone - Google Patents
Bohrkrone Download PDFInfo
- Publication number
- WO1997019247A1 WO1997019247A1 PCT/AT1996/000234 AT9600234W WO9719247A1 WO 1997019247 A1 WO1997019247 A1 WO 1997019247A1 AT 9600234 W AT9600234 W AT 9600234W WO 9719247 A1 WO9719247 A1 WO 9719247A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drill bit
- cutting edges
- face
- cutting edge
- cutting
- Prior art date
Links
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
Definitions
- the present invention relates to a drill bit, in particular percussion or rotary percussion drill bit, the drill head of which has cutters on its end face for loosening and / or crushing the material to be mined, at least one cutting edge being curved in a radial direction of the end face of the drill head.
- Drill bits in particular for percussion or rotary percussion drilling, have become known in various embodiments.
- DE-A 28 41 679, DE-A 29 52 295, DE-A 30 25 890 or DE-A 38 20 695 can be found for rock drill bits for rotary impact drilling, with a plurality of radial ones on the end face of the drill head Cutting edges running in the direction of the end face are arranged, some of which extend only over part of the radial extent of the end face.
- this drill bit When rotary percussion drilling conventional ⁇ is in each case after a beating stress on the drilling this drill bit may crown by a certain angle displaced and in turn acted upon by an impact tool, where by the alternate displacement in the rotational direction and hitting systematically on the path swept by the drill bit during the rotary movement area, the Material is crushed and broken out.
- the cutting edges used in the known embodiments are essentially trapezoidal or triangular-shaped and thus, in the event of striking stress, cause grooves or grooves to be formed by the cutting edges penetrating into the material to be broken down, with those extending in the radial direction being arranged Cutting through the striking stress the material is divided into sectors when penetrating the cutting.
- this angular distance is essentially determined by the distance on the outer circumference of the drill bit in the case of a radial arrangement of the cutting edges, while at the same time an unnecessarily tight setting of the cutting edges is carried out in the direction of the center.
- DE-C 918 741 shows a rock drill with single or multiple cutting edges, at least one arcuate cutting edge being provided in order to even out the wear of the cutting edges over their entire extent. Furthermore, it is proposed to provide an additional straight cutting edge in the concave region of the arcuate cutting edge, if necessary, in order to prevent the formation of the cutting edge Avoid cutting painted areas. According to this state of the art, however, to prevent excessive wear on the edges of the drill bit, additional Aufpanze ⁇ rungen must be provided, such excessive wear in particular due to the curved shape of the cutting edges, uneven weight distribution and unbalance of the entire drill bit and the resulting Problems in achieving a straight borehole will cause.
- the present invention now aims to further develop a drill bit of the type mentioned at the outset in such a way that a correspondingly modified positioning of the cutting edges on the end face of the drill head of the drill bit can achieve a more rapid breakdown of the cutting edge.
- the aim is to ensure that even if a relatively large angular distance between individual impact stresses in a rotary impact drill is selected, the entire area to be removed is covered substantially uniformly by the cutting edges and the material cross sections remaining between individual penetration points of the cutting edges are secure can be degraded when passing over a nachfol ⁇ constricting cutting or broken.
- the drill bit according to the invention is essentially characterized in that at least one further rectilinear cutting edge is arranged on the side of the convex curvature of the curved cutting edge. Since, according to the invention, in addition to a curved cutting edge according to the invention, a further rectilinear cutting edge is arranged on its convexly curved side, it is ensured that, in contrast to the use of cutting edges arranged only in the radial direction, which form a stop pattern with the formation of sector-shaped elevations between the individual penetration points of the cutting edges show that a less uniform and less regular stop pattern can be generated, the individual penetration points or lines of impact in the stop pattern of the cutting edges being cross different angles.
- a stop pattern is obtained in which at least partially irregularly shaped elevations remain between individual stop lines of the cutting edges, which can be easily broken due to their irregular shape.
- the straight cutting edge is arranged on the side of the convex curvature of the curved cutting edge, a more uniform weight distribution is achieved over the entire cross section of the drill bit, so that overall an unbalance of the drill bit which impairs the achievement of a straight bore is achieved in a simple manner and uneven wear can be avoided.
- the common center of gravity of the cutting edges lies in the longitudinal axis of the drill bit.
- the curved cutting edge is formed by a circular arc, an ellipse or parabola, as corresponds to a further preferred embodiment of the invention.
- the curvature of the at least one cutting edge curved to the radial direction of the end face can be designed as an arcuate curvature or generally as a conic section line, this making it possible to produce the cutting edge relatively easily.
- the curvature can be selected within wide limits according to the conditions of use, very flat curvatures, ie large radii of curvature, which result in cutting edges which differ only slightly from cutting edges aligned in a straight line, are also possible.
- cutting edges can also be used whose curvature has at least one turning point.
- the number of cutting edges arranged on the drilling head also essentially depends on the intended use, ie on the material to be dismantled, and on the size of the drilling head.
- the number of cutting edges in the case of larger diameter drilling heads can be a multiple of the number of cutting edges specified above, for example up to 40 or 50 cutting edges.
- the drill bit according to the invention is developed in such a way that the straight cutting edge forms an angle with a radial direction of the end face.
- the rectilinear cutting edge is designed as a cutting edge which extends in the radial direction and extends from the center of the drill bit to the edge of the end face of the drill bit.
- the curved cutting edge starts from the center of the drill bit or through the center the drill bit runs.
- the embodiment is also preferably made such that the end of the cutting edge, which lies at an angle with the radial direction, and / or the curved cutting edge, with a radial face, lies at the outer edge of the drill bit encloses an angle between 10 and 40 °, in particular 15 to 30 °.
- the design is further preferably made such that the cutting edges in cross-section essentially are triangular in shape and are provided at their tips with cutting edges formed, for example, by hard material inserts.
- the design is preferably such that the drill head has offset and / or flattened peripheral areas on its outer circumference in addition to the cutting edges, which may have additional cutting edges in the direction of rotation of the drill bit are provided. Furthermore, such additional cutters arranged in the direction of the drill bit also ensure that a correspondingly uniform outer contour of the borehole to be produced can be achieved.
- the drill bit has at least one channel for the introduction of a Flushing or cooling liquid and / or designed to discharge the degraded material.
- the channel opens into a plurality of outlet openings, which on the end face of the drill head are distributed symmetrically between the cutting edges.
- Figure 1 is a schematic side view, partly in section, of a drill bit according to the invention.
- FIG. 2 shows a plan view of the end face of the drill head of the drill bit according to arrow II of FIG. 1;
- FIG. 3 shows a stop diagram which is obtained with the sheath arrangement shown in FIG. 2; and FIGS. 4 and 5, in views similar to FIG. 2, on a reduced scale, schematic representations of further modified embodiments of the arrangement of cutting edges on a drill head of a drill bit according to the invention.
- Fig. 1, 1 generally denotes a drill bit, on the end face 2 of the drill head, a plurality of cutting edges
- one cutting edge 3 runs in a straight line and in the radial direction of the end face 2 of the drilling head, while the other cutting edge
- Both of the cutting edges 3 and 4 of this embodiment shown start from the center 5 of the drill bit 1, furthermore both cutting edges 3 and 4 extend to the outer circumferential edge of the end face 2 of the drilling head.
- the ends of the cutting edge 4 lying on the outer circumference enclose an acute angle with a radial, which is schematically denoted by ⁇ .
- a channel 6 is provided in the interior of the drill bit, which channel opens into a plurality of outlet openings 7 on the end face 2, with flushing or cooling liquid being able to be discharged through these outlet openings 7.
- a plurality of stepped or stepped areas 8 are provided between the cutting edges 3 and 4, which facilitate material removal of possibly larger material. enable pieces.
- cutters 9 can also be provided on these stepped or stepped areas 8 in the direction of rotation, which can also be used for a correspondingly smooth formation of the outer contours of the borehole to be produced.
- additional dismantling tools which are indicated schematically in FIG. 2 by 10, can also be provided on the end face 2 of the drill bit.
- the arrangement of the cutting edges 3 and 4 can be realized, for example, the stop diagram shown in FIG. 3, one of the positions of the cutting edges 3 and 4 being indicated by strong lines and the achievable impact lines or respectively corresponding lines being correspondingly weaker Cutting lines of the cutting edges 3 and 4 are indicated after twisting. It results directly that the cutting edges 3 and 4 are arranged differently in the radial direction on the end face 2, one of the cutting edges 4 being curved and the straight cutting edge 3 being arranged on the side of the convex curvature of the curved cutting edge 4 is to achieve a stop image in which essentially diamond-shaped material cross sections remain between the individual lines.
- the angle between adjacent impact stresses can be chosen such that one of the cutting edges 3 and 4 at the next rotation in essentially meets the remaining material cross-sections in the center and thus a safe breakout of the material over the entire surface can be guaranteed. It is immediately apparent that the proposed arrangement of the cutting edges in particular prevents the cutting edges 3 and 4 from re-inserting or slipping into existing depressions or indentations from previous impact stresses, but rather from reliably removing them between ahead outgoing penetration of the cutting remaining material can be made.
- the center of gravity of the cutting edges 3 and 4 lies essentially in the center point or the longitudinal axis of the drill bit 1, which is denoted by 5.
- the weight distribution can further be favored by, for example, symmetrically arranged channels 7 and by corresponding designs of the flattened areas 8 and also any additional hard material inserts 10 that may be required.
- surface areas of the end face 2 of the boring head 1 enclosed between two adjacent cutting edges or sections of cutting edges 3, 4 are essentially of the same size in order to further promote the degradation performance.
- FIG. 4 and 5 show further schematic views of modified embodiments of the arrangement of cutting edges on each end face 2 of a drill head.
- the embodiment shown in FIG. 4 has a curved cutting edge 11 in the form of a parabola, a straight cutting edge 12 again being provided on the side of the convex curvature.
- a curved cutting edge 11 in the form of a parabola
- a straight cutting edge 12 again being provided on the side of the convex curvature.
- an arcuate cutting edge 13 is defined by a section of an ellipse, in addition two rectilinear cutting edges 14 enclosing an angle are arranged on the side of the convex curvature of the arcuate cutting edge 13, again care is taken to ensure that the surfaces are distributed as evenly as possible between adjacent cutting edges or cutting portions 13 and 14 and that the center of gravity is centered as completely as possible.
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling Tools (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL96326764A PL180429B1 (pl) | 1995-11-23 | 1996-11-22 | Koronka wiertnicza PL |
AT96939744T ATE188535T1 (de) | 1995-11-23 | 1996-11-22 | Bohrkrone |
EP96939744A EP0862678B1 (de) | 1995-11-23 | 1996-11-22 | Bohrkrone |
DE59604134T DE59604134D1 (de) | 1995-11-23 | 1996-11-22 | Bohrkrone |
AU76849/96A AU7684996A (en) | 1995-11-23 | 1996-11-22 | Drill bit |
SI9630164T SI0862678T1 (en) | 1995-11-23 | 1996-11-22 | Drill bit |
GR20000400762T GR3033073T3 (en) | 1995-11-23 | 2000-03-27 | Drill bit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0064195U AT1513U1 (de) | 1995-11-23 | 1995-11-23 | Bohrkrone |
ATGM641/95 | 1995-11-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997019247A1 true WO1997019247A1 (de) | 1997-05-29 |
Family
ID=3495962
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT1996/000234 WO1997019247A1 (de) | 1995-11-23 | 1996-11-22 | Bohrkrone |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0862678B1 (de) |
AT (2) | AT1513U1 (de) |
AU (1) | AU7684996A (de) |
CZ (1) | CZ290060B6 (de) |
DE (1) | DE59604134D1 (de) |
ES (1) | ES2143244T3 (de) |
GR (1) | GR3033073T3 (de) |
PL (1) | PL180429B1 (de) |
PT (1) | PT862678E (de) |
WO (1) | WO1997019247A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002092957A3 (de) * | 2001-05-17 | 2003-04-17 | Atlas Copco Mai Gmbh | Bohrkrone |
EP2848339A1 (de) * | 2013-09-13 | 2015-03-18 | Irwin Industrial Tool Company | Welle für ein Bohrwerkzeug, Bohrwerkzeug und Verfahren zur Herstellung eines Bohrwerkzeugs |
JP2016515477A (ja) * | 2013-04-19 | 2016-05-30 | ディアジェ | 切削インサート |
US11598153B2 (en) | 2018-09-10 | 2023-03-07 | National Oilwell Varco, L.P. | Drill bit cutter elements and drill bits including same |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB189021A (en) * | 1921-11-21 | 1922-11-23 | Arthur Lee Hawkesworth | Drills |
US1718462A (en) * | 1923-07-02 | 1929-06-25 | Hardsocg Martin | Rock drill |
DE918741C (de) * | 1949-09-03 | 1954-10-04 | Boehler & Co Ag Geb | Gesteinsbohrer mit Einfach- oder Mehrfachschneiden |
US3062306A (en) * | 1959-03-19 | 1962-11-06 | Sandvikens Jernverks Ab | Drill bit |
CH544880A (de) * | 1970-06-12 | 1974-01-15 | Trident Ind Inc | Bohreinheit, insbesondere für Seilbohrvorrichtung |
US3878905A (en) * | 1972-04-07 | 1975-04-22 | Hawera Probst Kg Hartmetall | Drill, especially rock drill |
EP0452255A2 (de) * | 1990-04-09 | 1991-10-16 | HILTI Aktiengesellschaft | Gesteinsbohrer |
-
1995
- 1995-11-23 AT AT0064195U patent/AT1513U1/de not_active IP Right Cessation
-
1996
- 1996-11-22 PL PL96326764A patent/PL180429B1/pl not_active IP Right Cessation
- 1996-11-22 ES ES96939744T patent/ES2143244T3/es not_active Expired - Lifetime
- 1996-11-22 AT AT96939744T patent/ATE188535T1/de active
- 1996-11-22 DE DE59604134T patent/DE59604134D1/de not_active Expired - Lifetime
- 1996-11-22 AU AU76849/96A patent/AU7684996A/en not_active Abandoned
- 1996-11-22 CZ CZ19981559A patent/CZ290060B6/cs not_active IP Right Cessation
- 1996-11-22 PT PT96939744T patent/PT862678E/pt unknown
- 1996-11-22 WO PCT/AT1996/000234 patent/WO1997019247A1/de active IP Right Grant
- 1996-11-22 EP EP96939744A patent/EP0862678B1/de not_active Expired - Lifetime
-
2000
- 2000-03-27 GR GR20000400762T patent/GR3033073T3/el unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB189021A (en) * | 1921-11-21 | 1922-11-23 | Arthur Lee Hawkesworth | Drills |
US1718462A (en) * | 1923-07-02 | 1929-06-25 | Hardsocg Martin | Rock drill |
DE918741C (de) * | 1949-09-03 | 1954-10-04 | Boehler & Co Ag Geb | Gesteinsbohrer mit Einfach- oder Mehrfachschneiden |
US3062306A (en) * | 1959-03-19 | 1962-11-06 | Sandvikens Jernverks Ab | Drill bit |
CH544880A (de) * | 1970-06-12 | 1974-01-15 | Trident Ind Inc | Bohreinheit, insbesondere für Seilbohrvorrichtung |
US3878905A (en) * | 1972-04-07 | 1975-04-22 | Hawera Probst Kg Hartmetall | Drill, especially rock drill |
EP0452255A2 (de) * | 1990-04-09 | 1991-10-16 | HILTI Aktiengesellschaft | Gesteinsbohrer |
Non-Patent Citations (1)
Title |
---|
MADAN M. SINGH: "What to consider in selecting rock bits", ENGINEERING AND MINING JOURNAL, vol. 171, 1970, pages 45 - 55, XP002027248 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002092957A3 (de) * | 2001-05-17 | 2003-04-17 | Atlas Copco Mai Gmbh | Bohrkrone |
EP1564365A2 (de) | 2001-05-17 | 2005-08-17 | Atlas Copco Mai GmbH | Bohrkrone |
EP1564365A3 (de) * | 2001-05-17 | 2007-05-02 | Atlas Copco Mai GmbH | Bohrkrone |
JP2016515477A (ja) * | 2013-04-19 | 2016-05-30 | ディアジェ | 切削インサート |
EP2848339A1 (de) * | 2013-09-13 | 2015-03-18 | Irwin Industrial Tool Company | Welle für ein Bohrwerkzeug, Bohrwerkzeug und Verfahren zur Herstellung eines Bohrwerkzeugs |
EP3345705A1 (de) * | 2013-09-13 | 2018-07-11 | Irwin Industrial Tool Company | Welle für ein bohrwerkzeug, bohrwerkzeug und verfahren zur herstellung eines bohrwerkzeugs |
US11598153B2 (en) | 2018-09-10 | 2023-03-07 | National Oilwell Varco, L.P. | Drill bit cutter elements and drill bits including same |
Also Published As
Publication number | Publication date |
---|---|
CZ290060B6 (cs) | 2002-05-15 |
AT1513U1 (de) | 1997-06-25 |
DE59604134D1 (de) | 2000-02-10 |
AU7684996A (en) | 1997-06-11 |
GR3033073T3 (en) | 2000-08-31 |
PL180429B1 (pl) | 2001-02-28 |
PT862678E (pt) | 2000-06-30 |
CZ155998A3 (cs) | 1998-09-16 |
PL326764A1 (en) | 1998-10-26 |
EP0862678B1 (de) | 2000-01-05 |
ATE188535T1 (de) | 2000-01-15 |
ES2143244T3 (es) | 2000-05-01 |
EP0862678A1 (de) | 1998-09-09 |
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