EP0862678B1 - Bohrkrone - Google Patents

Bohrkrone Download PDF

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Publication number
EP0862678B1
EP0862678B1 EP96939744A EP96939744A EP0862678B1 EP 0862678 B1 EP0862678 B1 EP 0862678B1 EP 96939744 A EP96939744 A EP 96939744A EP 96939744 A EP96939744 A EP 96939744A EP 0862678 B1 EP0862678 B1 EP 0862678B1
Authority
EP
European Patent Office
Prior art keywords
drill bit
face
cutting edge
cutting edges
cutting
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.)
Expired - Lifetime
Application number
EP96939744A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0862678A1 (de
Inventor
Josef Mocivnik
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.)
Alwag Tunnelausbau GmbH
Original Assignee
Techmo Entwicklungs und Vertriebs GmbH
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 Techmo Entwicklungs und Vertriebs GmbH filed Critical Techmo Entwicklungs und Vertriebs GmbH
Priority to SI9630164T priority Critical patent/SI0862678T1/xx
Publication of EP0862678A1 publication Critical patent/EP0862678A1/de
Application granted granted Critical
Publication of EP0862678B1 publication Critical patent/EP0862678B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E21B10/36—Percussion drill bits

Definitions

  • the present invention relates to a drill bit, in particular percussion or rotary percussion bit, the drill head cut on its face to loosen and / or shred of the material to be mined, at least one Cutting edge curved to a radial direction of the face the drill head runs and at least one more straight running edge on the side of the convex curvature of the curved cutting edge is arranged.
  • Drill bits especially for impact or rotary impact drilling, are known in different embodiments become. So are DE-A 28 41 679, DE-A 29 52 295, the DE-A 30 25 890, DE-A 38 20 695 or US-A 3 062 306
  • To remove rock core bits for rotary impact drilling whereby at the end face of the drill head a plurality of radial Cutting edges arranged in the direction of the end face are, which are sometimes only part of the radial Extend the face.
  • rotary impact drilling is usually after an impact stress the core bit this core bit by a certain angle displaced and in turn struck with a striking tool, with the alternating displacement in the direction of rotation and systematically strike on the drill bit the rotary movement swept the material and is broken out.
  • the in the known embodiments are essentially trapezoidal or triangular and thus cause a beating Stress formation of grooves or grooves by penetrating the cutting edges into the material to be mined, being arranged in the radial direction Cutting the material due to the impact is divided into sectors when the cutting edges penetrate. For the case that in between the impact stresses Rotational movement of the mutual angular distance too large is selected, only the grooves are cut in the material incorporated and it remains between the individual grooves relatively large, sector-shaped, raised material cross sections, which didn't break out easily can be.
  • DE-C 918 741 is a rock drill with single or multiple cutting edges, at least an arcuate cutting edge is provided to prevent wear and tear to even the cutting across their entire extent. It is also proposed in the concave area of the arcuate cutting edge, if necessary, an additional straight Provide cutting edge to avoid the emergence of the Avoid cutting painted areas. According to this However, prior art must avoid excessive Wear on the edges of the drill bit additional armoring be provided, such excessive wear in particular by the arcuate design of the Cutting resulting, uneven weight distribution and Imbalance of the entire drill bit and the resulting ones Problems in achieving a straight borehole become.
  • a drill bit, especially a percussion or rotary impact bit, GB-A 189 021 is of the type mentioned at the beginning can be seen, with a straight edge on the end face in a radial direction through the center of the drill cone runs and at an end portion of the straight edge a curved edge with the side running normally joins their convex curvature. Even with this well-known Training can be due to uneven weight distribution result in an imbalance.
  • the present invention now aims to provide a drill bit of the type mentioned to further develop that by a correspondingly modified positioning of the Cut into the face of the drill bit of the drill bit a faster breakdown favoring the cutting edges can be realized.
  • the aim is to that even when choosing a relatively large angular distance between individual impact loads on a rotary impact drill the entire area to be mined is substantially uniform is swept by the cutting edges and the between individual penetration points of the cutting edges remaining material cross sections safe when painting over with a subsequent one Cutting edge can be removed or broken out.
  • the drill bit according to the invention in essentially characterized in that the curved Cut from the center of the drill bit or through the The center of the drill bit runs.
  • each of two neighboring Cutting enclosed areas on the face of the Drill bits are essentially the same size, which also means the stop pattern even with larger angular distances between can improve the striking stresses and thus can achieve an overall increase in propulsive power.
  • the curvature of the at least one is curved to the radial direction the cutting edge running on the end face can, as indicated above, as an arcuate curvature or generally as be a conic section line, this being a relative enables easy manufacture of the cutting edge.
  • Hiebei can the curvature according to the conditions of use Limits are selected, with very flat curves, i.e. large radii of curvature, which result in cutting edges, which ones only slightly from cutting edges aligned in a straight line deviate, are possible. Of course you can too Cutting edges are used, the curvature of which is at least one Has inflection point.
  • the number of arranged on the drill head Cutting also largely depends on the intended use, i.e.
  • the size of the drill head from. While with relatively small diameters of the drill head with relatively little cutting, i.e. for example two to four Cutting, at least one of which is curved to a radial Direction of the end face of the drill head and a further on the side of the convex curvature, the The number of cutting edges can be found with larger diameter drill heads, for example up to 80 or 100 cm in diameter, a multiple the number of cutting edges indicated above, for example up to to be 40 or 50 cutting edges.
  • the invention is Drill bit developed in such a way that the straight line running cutting edge an angle with a radial Direction of the face.
  • the straight line running cutting edge an angle with a radial Direction of the face.
  • the invention provided that the rectilinear cutting edge as a cutting edge extending in the radial direction is formed, which from the center of the drill bit to the edge the end face of the drill bit runs.
  • the scope also lies in the areas preferably made in such a way that it is on the outer edge of the drill bit lying end of the one enclosing an angle with the radial direction Cutting edge and / or the curved cutting edge a radial of the end face an angle between 10 and 40 °, especially 15 to 30 °.
  • the training is further preferred taken so that the cutting in cross section essentially are triangular and with at their tips for example, cutting edges formed by hard material inserts are provided.
  • the training is preferably made so that the drill head on its outer circumference next to the cutting edges and / or has flattened peripheral areas, which may be in Provide additional cutting edges for the direction of rotation of the drill bit are. Furthermore, such additional in the direction of Drill bits arranged cutting edges also ensure that a corresponding uniform outer contour of the can be produced borehole.
  • a rinsing or cooling liquid in the area of the end face of the drill bit and / or for easy removal, especially rinsing, of mined material is according to another form of training preferably provided that the drill bit with at least one Channel for introducing a rinsing or cooling liquid and / or is designed to discharge the mined material.
  • the drill bit is preferably provided for the channel to be in a plurality of outlet openings, which at the End face of the drill head distributed symmetrically between the Cutting edges.
  • pin or spherical hard material inserts on the end face the drill bit are set to, especially in the larger material cross-sections on the outer circumference to remove as completely as possible. This allows also the weight distribution of the drill bit to achieve a rectilinear bore even.
  • Fig. 1, 1 generally denotes a drill bit whose end face 2 of the drill head has a plurality of cutting edges 3 and 4 is arranged, as can be seen from the top view of FIG. 2 can be seen in more detail.
  • a cutting edge 3 runs in a straight line and in the radial direction the end face 2 of the drill head while the other cutting edge 4 curved in a circular arc relative to the radial direction runs.
  • Both of the cutting edges 3 and 4 shown Embodiment start from the center 5 of the drill bit 1, wherein furthermore both cutting edges 3 and 4 up to the outer peripheral edge extend the end face 2 of the drill head.
  • the most The outer circumferential ends of the cutting edge 4 close here an acute angle with a radial, which is schematic is denoted by a.
  • the stop pattern shown in Fig. 3 realize, with strong lines one of the Positions of the cutting edges 3 and 4 are indicated and with accordingly weaker lines each the achievable impact lines or incision lines of the cutting edges 3 and 4 after one Twist are indicated. It follows immediately that characterized in that the cutting edges 3 and 4 differ in radial Are arranged running in the direction on the end face 2, wherein one of the cutting edges 4 is curved and the straight edge 3 on the side of the convex curvature of the arcuate cutting edge 4 is arranged to achieve a stop pattern leaves, in which essentially diamond-shaped material cross-sections remain between the individual lines.
  • the angle between adjacent impact loads like this be chosen that one of the cutting edges 3 and 4 at the next turn essentially in the middle of the remaining Material cross-sections strikes and thus a safe breakout guaranteed of the material over the entire surface can be. It is immediately apparent that the proposed Arrangement of the cutting edges in particular prevented is that when the cutting edges 3 and 4 these into existing recesses or notches from previous impact loads occur or slip can, but that a safe removal of between previous Penetration points of the remaining material can be made.
  • the weight distribution can also through, for example, symmetrically arranged channels 7 and through appropriate training of the flattened areas 8 as well as any additional hard material inserts required 10 are favored.
  • For a uniform and favorable field pattern is also provided that between two adjacent cutting edges or sections of Cut 3, 4 enclosed surface areas of the end face 2 of the drill head 1 are substantially the same size to the Favor mining performance further.
  • FIG. 4 and 5 are further modified schematic views Embodiments of the arrangement of cutting on each shown an end face 2 of a drill head. So the embodiment shown in Fig. 4 has a curved Cut 11 in the form of a parabola, again a straight line on the side of the convex curvature Cutting edge 12 is provided.
  • a curved Cut 11 in the form of a parabola
  • a straight line on the side of the convex curvature Cutting edge 12 is provided.
  • both the curvature behavior of the arcuate cutting edge 11 as well the relative positioning of the cutting edges 11 and 12 to each other between adjacent cutting edges or sections of cutting edges 11 and 12 again essentially the same Surface areas are provided on the end face 2 and it takes place again centering the focus in the area of Center point or longitudinal axis 5 of the drill bit 1.
  • an arcuate cutting edge 13 of a section of a Ellipse defines, in addition, two form an angle with each other including straight-line cutting edges 14 on the side of the convex curvature of the arcuate cutting edge 13 is arranged, again in turn as uniformly as possible Distribution of the areas between adjacent cutting edges or cutting sections 13 and 14 as well as possible full centering of the center of gravity is ensured.

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)
EP96939744A 1995-11-23 1996-11-22 Bohrkrone Expired - Lifetime EP0862678B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9630164T SI0862678T1 (en) 1995-11-23 1996-11-22 Drill bit

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT641/95 1995-04-13
AT64195 1995-11-23
AT0064195U AT1513U1 (de) 1995-11-23 1995-11-23 Bohrkrone
PCT/AT1996/000234 WO1997019247A1 (de) 1995-11-23 1996-11-22 Bohrkrone

Publications (2)

Publication Number Publication Date
EP0862678A1 EP0862678A1 (de) 1998-09-09
EP0862678B1 true EP0862678B1 (de) 2000-01-05

Family

ID=3495962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96939744A Expired - Lifetime EP0862678B1 (de) 1995-11-23 1996-11-22 Bohrkrone

Country Status (10)

Country Link
EP (1) EP0862678B1 (cs)
AT (2) AT1513U1 (cs)
AU (1) AU7684996A (cs)
CZ (1) CZ290060B6 (cs)
DE (1) DE59604134D1 (cs)
ES (1) ES2143244T3 (cs)
GR (1) GR3033073T3 (cs)
PL (1) PL180429B1 (cs)
PT (1) PT862678E (cs)
WO (1) WO1997019247A1 (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002092957A2 (de) 2001-05-17 2002-11-21 Atlas Copco Mai Gmbh Bohrkrone
FR3004746B1 (fr) * 2013-04-19 2015-05-15 Diager Plaquette de coupe
EP2848339B1 (en) * 2013-09-13 2018-03-28 Irwin Industrial Tool Company Shaft for a drilling tool, drilling tool and method for manufacturing a drilling tool
US11598153B2 (en) 2018-09-10 2023-03-07 National Oilwell Varco, L.P. Drill bit cutter elements and drill bits including same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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
DE2216760C2 (de) * 1972-04-07 1982-11-11 Hawera Probst Gmbh + Co, 7980 Ravensburg Gesteinsbohrer
DE4011441A1 (de) * 1990-04-09 1991-10-10 Hilti Ag Gesteinsbohrer

Also Published As

Publication number Publication date
PL180429B1 (pl) 2001-02-28
CZ290060B6 (cs) 2002-05-15
WO1997019247A1 (de) 1997-05-29
AU7684996A (en) 1997-06-11
DE59604134D1 (de) 2000-02-10
ATE188535T1 (de) 2000-01-15
ES2143244T3 (es) 2000-05-01
CZ155998A3 (cs) 1998-09-16
PT862678E (pt) 2000-06-30
PL326764A1 (en) 1998-10-26
AT1513U1 (de) 1997-06-25
EP0862678A1 (de) 1998-09-09
GR3033073T3 (en) 2000-08-31

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