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WO1992013169A1 - Trepan destine a un marteau-foreur rotatif pour roches fonctionnant par pression axiale et a percussion - Google Patents

Trepan destine a un marteau-foreur rotatif pour roches fonctionnant par pression axiale et a percussion Download PDF

Info

Publication number
WO1992013169A1
WO1992013169A1 PCT/DE1992/000009 DE9200009W WO9213169A1 WO 1992013169 A1 WO1992013169 A1 WO 1992013169A1 DE 9200009 W DE9200009 W DE 9200009W WO 9213169 A1 WO9213169 A1 WO 9213169A1
Authority
WO
WIPO (PCT)
Prior art keywords
hard metal
drill bit
metal pins
face
bit according
Prior art date
Application number
PCT/DE1992/000009
Other languages
German (de)
English (en)
Inventor
Thomas Wolf
Rainer Klauer
Original Assignee
Thomas Wolf
Rainer Klauer
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 Thomas Wolf, Rainer Klauer filed Critical Thomas Wolf
Publication of WO1992013169A1 publication Critical patent/WO1992013169A1/fr

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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts

Definitions

  • the invention relates to a drill bit intended for a rotating rock drill operating with axial pressure and impacts, the end face of which has a plurality of pocket holes with hard metal pins protruding therein and projecting over the end face of the drill head.
  • Drill bits of the above type are used in the production of boreholes for rock destruction. With them, the hard metal pins are inserted in the axial face of the drill bit and have a rounded face. Obviously, with this orientation of the hard metal pins, the primary consideration was that the impact forces reaching axially in the drill bit should be supported by the hard metal pins axiaL.
  • Drilling holes in rock is a very time consuming and costly job. To reduce drilling times, drilling tools with ever increasing efforts are being used today. Furthermore, efforts are being made to increase the drilling capacity by means of rinsing out, by means of an improved discharge of the pieces of rock detached from the drill bit. However, the known measures for improving the drilling performance only led to relatively limited success.
  • the invention is based on the problem of designing a drill bit of the type mentioned at the outset in such a way that it increases the drilling performance with the same drive performance.
  • the hard metal pins penetrate the rock more easily as a result of the rotational movement and axial force than with the known drill bits. They are therefore able to loosen rocks with less energy.
  • the oblique carbide pins can protrude further from the end face than in the known drill bits, without tending to break off. This is due to the fact that the hard metal pins are loaded obliquely by the simultaneous action of the compressive and impact force directed in the axial direction and the cutting force resulting from the rotation of the drill bit.
  • Axially aligned hard metal pins are therefore subjected to bending, while the oblique hard metal pins arranged according to the invention are oriented approximately as the resultants of axial force and circumferential force run, so that they are essentially only axially stressed.
  • the inclination of the hard metal pins must be adapted to the type of rock. For commonly occurring rock types, it has proven to be expedient if the inclined position of the hard metal pins in the running direction is approximately 10 to 30 degrees to the axial direction of the drill bit.
  • the breaking away of rocks by means of the hard metal pins can be further promoted in that, according to a development of the invention, the hard metal pins are inclined in addition to the inclination in the running direction towards the center of the drill bit. Such an inclination avoids that the hard metal pins only produce concentric grooves in the rock, between which there remain webs on which the end face of the drill bit is seated. By slanting towards the center of the drill, these webs are more easily destroyed.
  • the extent of the inclination of the carbide pins towards the center of the drill bit also depends on the type of rock. It has proven to be advantageous for most cases if the inclination of the hard metal insert to the center of the drill bit is approximately 5 degrees.
  • the hard metal pins have a conical tip. So far, such tips have been dispensed with, because with conventional drill bits, these tips would dull too quickly. In the case of very inclined L lten carbide pins, however, there is a self-sharpening effect, so that the service life is surprisingly long. A sluggishness of the drill bit due to increased friction of its lateral surface against the wall of the borehole as a result of rock pieces jamming there can be ruled out in a simple manner by inserting slightly radially projecting hard metal pins with a rounded end surface in its lateral surface.
  • the stability and service life of the drill bit can be increased many times over if the hard metal pins of the lateral surface protrude slightly less radially outwards than the hard metal pins on the truncated cone surface. This also increases the smooth running of the drill bit.
  • the risk of the drill bit jamming in the borehole can be countered by the fact that the division of the hard metal pins in the end face is fixed in such a way that there is a moment-free support in axial direction with respect to the axis of rotation.
  • FIG. 1 shows a side view of a drill bit designed according to the invention
  • the drill bit shown as a whole in FIG. 1 has a shank 1 and a larger-diameter drill bit head 2 with a flat end face 3, a cylindrical outer surface 4 and a Kege Istumpff Lache 5 connecting the end face 3 with the outer surface 4. From the end face 3 protrude hard metal pins 6, all of which are slightly very inclined in the tangential direction and towards the center of the drill bit and each have a sharp, conical tip.
  • hardmetal L Isti fte 7 are arranged, which are also arranged in tangent ia L direction, ie obliquely in the running direction and a Kegel ⁇ tip on egg.
  • hard metals Lsti fte 8, 8a are arranged in a radial orientation, which have a rounded end surface, which protrudes slightly from the lateral surface 4.
  • the hard metals 7 located on the frustoconical surface 5 project radially slightly further than the adjacent hard metal pins 8 a in the lateral surface 4.
  • the hard metals 8 arranged further down in FIG. 1 are again slightly in relation to the hard metal pins 8 a set back in the radial direction.
  • FIG. 2 shows that at least the hard metal pins 6, 6a, 6b, 6c arranged near the drill bit center 9 are located on different part circles, so that they do not work one after the other when drilling.
  • FIG. 2 also shows four rinsing channels 10, 10a, 10b, 10c, through which the washing-up liquid which discharges the loosened rocks is fed.
  • FIG. 3 illustrates how the hard metal pins 6, 7, 7a are aligned.
  • the superimposed, left hand Darste L lungs each show a view of a hard metal pin 6, 7, 7a tangential to the drill bit, while the right-hand representations each show a view rotated by 90 degrees.
  • the upper left illustration shows that the hard metal L Lsti ft 6 is tilted about 5 degrees to the center of the drill bit.
  • the direction to the center of the drill bit was indicated by an arrow 12.
  • the upper right illustration shows that the hard metal lsti ft 6 is simultaneously tilted by 20 degrees in the running direction indicated by a leftover 13.
  • the blind hole 11 receiving it must of course be drilled accordingly at an angle.
  • the hard metals 7, 7a are arranged differently on the Kege Istumpff Lache 5.
  • the outer hard metal pins 7a are tilted 30 degrees outwards from the center of the drill bit. They protrude slightly beyond the outer contour of the radially aligned hard metal pins 8. All hard metal pins 7 and 7a are tilted by 20 degrees in the running direction.

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)

Abstract

Dans un trépan, les pointes en métal dur (6) insérées dans sa face sont disposées, par rapport au sens axial, dans le sens du déplacement avec une inclinaison d'environ 20 degrés. En outre, les pointes en métal dur (6) sont légèrement inclinées vers le centre du trépan à environ 5 degrés. A puissance d'entraînement égale, le rendement de forage du trépan augmente ainsi considérablement.
PCT/DE1992/000009 1991-01-19 1992-01-08 Trepan destine a un marteau-foreur rotatif pour roches fonctionnant par pression axiale et a percussion WO1992013169A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4101458.8 1991-01-19
DE19914101458 DE4101458A1 (de) 1991-01-19 1991-01-19 Fuer einen mit axialem druck und schlaegen arbeitenden, umlaufenden gesteinsbohrer bestimmter bohrmeissel

Publications (1)

Publication Number Publication Date
WO1992013169A1 true WO1992013169A1 (fr) 1992-08-06

Family

ID=6423292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1992/000009 WO1992013169A1 (fr) 1991-01-19 1992-01-08 Trepan destine a un marteau-foreur rotatif pour roches fonctionnant par pression axiale et a percussion

Country Status (2)

Country Link
DE (1) DE4101458A1 (fr)
WO (1) WO1992013169A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140196959A1 (en) * 2006-08-11 2014-07-17 Schlumberger Technology Corporation Downhole drill bit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105738C2 (de) * 1991-02-23 1997-07-03 Emmerich Hunsdorfer Dreh-Schlag-Bohrwerkzeug sowie Verfahren zur Gesteinsbohrung
AT265U3 (de) * 1995-01-18 1996-01-25 Techmo Entw & Vertriebs Gmbh Bohrkrone
SE531774C2 (sv) * 2006-11-29 2009-08-04 Sandvik Intellectual Property Stiftborrkrona

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147791A1 (en) * 1971-07-01 1973-03-11 Precidia Bore-hole drill - with cutting element faces disposed at pre determined optimum angles to drilling axis
US3858671A (en) * 1973-04-23 1975-01-07 Kennametal Inc Excavating tool
FR2358539A1 (fr) * 1976-07-13 1978-02-10 Lister William Trepan de forage de roche
DE8814613U1 (de) * 1988-11-23 1989-01-26 Bauer Spezialtiefbau GmbH, 8898 Schrobenhausen Pilotbohrer
FR2646875A1 (fr) * 1989-05-11 1990-11-16 Matieres Nucleaires Cie Genera Taillant roto-percutant de forage a elements d'attaque ultra-durs
GB2242464A (en) * 1990-03-26 1991-10-02 Sandvik Ab Drill bit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7434036U (de) * 1975-05-15 Bohrer Gmbh Fuer Industrie Handel H Werkzeugsatz für Bohrhämmer
AT302937B (de) * 1970-06-05 1972-11-10 Boehler & Co Ag Geb Gesteinsbohrkrone, insbesondere für Schlagbohrgeräte
US4109737A (en) * 1976-06-24 1978-08-29 General Electric Company Rotary drill bit
DE2633779C3 (de) * 1976-07-28 1983-11-03 Richard 5383 Kierspe Karnebogen Schlagbohrkrone
DE2749613B2 (de) * 1977-11-05 1979-12-20 Fried. Krupp Gmbh, 4300 Essen Schlagbohrkrone für Gesteinsbohrungen
DE3408225A1 (de) * 1984-03-07 1985-09-19 Richard 5383 Kierspe Karnebogen Schlagbohrkrone
DE3510048C1 (de) * 1985-03-20 1986-04-10 Siegfried 5883 Kierspe Treitz Schlagbohrkrone fuer Gesteinsbohrmaschinen
DE3544433C2 (de) * 1985-12-16 1995-12-14 Hilti Ag Gesteinsbohrer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147791A1 (en) * 1971-07-01 1973-03-11 Precidia Bore-hole drill - with cutting element faces disposed at pre determined optimum angles to drilling axis
US3858671A (en) * 1973-04-23 1975-01-07 Kennametal Inc Excavating tool
FR2358539A1 (fr) * 1976-07-13 1978-02-10 Lister William Trepan de forage de roche
DE8814613U1 (de) * 1988-11-23 1989-01-26 Bauer Spezialtiefbau GmbH, 8898 Schrobenhausen Pilotbohrer
FR2646875A1 (fr) * 1989-05-11 1990-11-16 Matieres Nucleaires Cie Genera Taillant roto-percutant de forage a elements d'attaque ultra-durs
GB2242464A (en) * 1990-03-26 1991-10-02 Sandvik Ab Drill bit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140196959A1 (en) * 2006-08-11 2014-07-17 Schlumberger Technology Corporation Downhole drill bit
US9051795B2 (en) * 2006-08-11 2015-06-09 Schlumberger Technology Corporation Downhole drill bit
US9708856B2 (en) 2006-08-11 2017-07-18 Smith International, Inc. Downhole drill bit
US10378288B2 (en) 2006-08-11 2019-08-13 Schlumberger Technology Corporation Downhole drill bit incorporating cutting elements of different geometries

Also Published As

Publication number Publication date
DE4101458A1 (de) 1992-07-23

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