EP0607958A1 - Trépan de roche - Google Patents

Trépan de roche Download PDF

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Publication number
EP0607958A1
EP0607958A1 EP94100784A EP94100784A EP0607958A1 EP 0607958 A1 EP0607958 A1 EP 0607958A1 EP 94100784 A EP94100784 A EP 94100784A EP 94100784 A EP94100784 A EP 94100784A EP 0607958 A1 EP0607958 A1 EP 0607958A1
Authority
EP
European Patent Office
Prior art keywords
cutting plate
main cutting
secondary cutting
drill
rock drill
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.)
Granted
Application number
EP94100784A
Other languages
German (de)
English (en)
Other versions
EP0607958B1 (fr
Inventor
Klaus Dreps
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.)
Drebo Werkzeugfabrik GmbH
Original Assignee
Drebo Werkzeugfabrik 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 Drebo Werkzeugfabrik GmbH filed Critical Drebo Werkzeugfabrik GmbH
Publication of EP0607958A1 publication Critical patent/EP0607958A1/fr
Application granted granted Critical
Publication of EP0607958B1 publication Critical patent/EP0607958B1/fr
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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/58—Chisel-type inserts

Definitions

  • the invention relates to a rock drill, according to the preamble of claim 1.
  • Such rock drills are usually designed as percussion or hammer drills.
  • the drill head has a transversely extending hard metal plate, which is intended to serve to destroy the rock by the impact movement. This is done by a chisel action of the rock drill, which carries out a striking movement, then withdraws during the rotation and, after rotation by a predetermined angle, carries out the next striking movement. In this way, for example, 4, 6 or 8 striking movements per rotation can be realized.
  • the invention has for its object to provide a rock drill according to the preamble of claim 1, which shows a reasonable drilling progress even with problematic rock, in particular brittle and hard rock and such with hard stone inclusions, without increasing the wear effect due to an excessive axial load .
  • the secondary cutting edge according to the invention is intended to hit and destroy precisely these webs so that the main cutting insert can achieve further propulsion at the next opportunity. This prevents the webs on the drill face from the side of the main cutting edge from being touched and - since the drill face can only achieve a small surface pressure with the force available - cannot ultimately be eliminated.
  • the secondary cutting insert extends offset against the main cutting insert, so that when it rotates it meets the webs approximately at right angles and shatters them.
  • the secondary cutting insert does not extend radially, but rather parallel to the main cutting insert and off-center in relation to the drill axis.
  • Different designs are possible, whereby according to a preferred embodiment only one secondary cutting plate is provided, which extends obliquely between the main cutting plate and the outer radius of the drill head.
  • the concentricity of the drill should not be impaired by the secondary cutting plate, which can be achieved, for example, by milling a drilling dust removal groove provided in the region of the secondary cutting plate somewhat deeper so that the Mass distribution is evened out.
  • less material can be removed during manufacture of the drill on the side opposite the asymmetrical secondary cutting insert, which is possible by adjusting the tools used for producing the drill accordingly.
  • 2 opposing cutting inserts are provided, which are arranged on different radii, so that the second cutting insert shatters another radial region of the web.
  • the arrangement of the secondary cutting plates is chosen so that they each meet the webs.
  • the main action of the secondary cutting insert should therefore preferably take place at an angle of 30, 90 or 150 ° with respect to the main cutting insert, while a shattering effect in the range of 60 and 120 ° cannot be achieved, since at these positions the main cutting insert is next or next strikes the next but one and thus there is a basic drilling groove.
  • the majority of the webs left by the main cutting edge remain outside the center of the radius of the drill, viewed in the radial direction. This is due to the fact that the distance between points on the basic drilling grooves is radial outer area is largest.
  • a favorable clearing and shattering effect for the webs can be achieved, for example, if a roof-shaped secondary cutting plate is arranged approximately at half the radius and the opposite secondary cutting plate is arranged at 75% of the radius, as viewed from the drill axis to the outside.
  • the cutting edge of the secondary cutting plate lies in the conical or conical surface area spanned by the main cutting plate.
  • the drill runs better centrically, and there are fewer diameter deviations.
  • the tip of the secondary cutting insert can reach the conical surface or end beforehand. It is also important that it protrudes clearly from the end face of the drill so that it can exert the desired splitting action for the drill base webs.
  • the secondary cutting plate has a roof-shaped structure.
  • a main cutting insert provided for a drill with a smaller diameter and manufactured in large quantities as standard can also be used particularly advantageously as a secondary cutting insert for the rock drill according to the invention in one embodiment.
  • the secondary cutting plate then has a roof-shaped structure, also viewed in the transverse direction. The tip formed in this way is particularly favorable for the destruction of the web.
  • the design in which the secondary cutting insert rests at one point on the main cutting insert and extends obliquely away from it, offers the particular advantage that the entire radial area is swept obliquely, so that the web fragmentation can take place in a particularly favorable course.
  • This configuration is also suitable for impact drills, in which only 4 angular positions for the Main cutting edge are provided per revolution. Due to the one-sided, asymmetrical design, each basic drilling groove is hit twice as often by the main cutting edge as every bar to be broken down by the secondary cutting edge. For this, the debris effect of the secondary cutting edge is improved compared to a symmetrical design due to the higher pressure.
  • a rock drill 10 has a drill head 12, the end face 14 of which can be seen in FIG. 1.
  • a hard metal plate 16 which forms the main cutting plate and has a main cutting edge 18, extends across the end face.
  • secondary cutting plates 20 and 22 extend parallel to the main cutting plate 16 and are offset to the right and left in relation to the main cutting plate 16 in the plane of the drawing.
  • the secondary cutting plates 20 and 22 extend substantially parallel to the main cutting plate 16. They are fastened in the drill head 12 in a manner known per se, corresponding to the fastening of the main cutting plate 16.
  • the distance between the secondary cutting plate 20 and the main cutting plate 16 is less than the distance between the secondary cutting plate 22 and the main cutting plate 16. Accordingly, the secondary cutting plate 22 acts on a circle which is radially outward from the sphere of action of the secondary cutting plate 20 and serves to destroy the web in the outer region of the drilling base, as shown in Fig. 5.
  • the main cutting plate 16 extends radially outward beyond the diameter of the drill head 12.
  • the secondary cutting inserts 20 and 22 are considerably shorter and, in the example, extend about a quarter of the length of the main cutting insert 16.
  • the main cutting plate 16 projects beyond the secondary cutting plate 20 both in height and laterally. This applies equally to the secondary cutting insert 22.
  • drilling dust removal grooves 24 and 26 are provided to the side of the secondary cutting inserts 20 and 22, 2 drilling dust removal grooves 24 and 26 are provided. In the area of the secondary cutting plates 22, no drilling dust removal grooves are shown in the figures. It goes without saying, however, that drill dust removal grooves can also be provided at this point if desired, and in addition, through the design of the drill dust removal grooves in the region of the end face 14, mass compensation can be realized between the secondary cutting plate 20 arranged further inwards and the secondary cutting plate 22 arranged further outwards in order to achieve the Avoid creating an imbalance.
  • the secondary cutting inserts 20 and 22 can have cutting edges which are designed in the manner known for main cutting inserts.
  • a rock drill according to the invention inexpensive to realize as a secondary cutting insert by using hard metal plates, which are intended for drilling heads with correspondingly smaller diameters.
  • a hard metal plate for an 8 mm rock drill can be used for the secondary cutting plates 20 and 22.
  • the secondary cutting plates 20 are roof-shaped when viewed in both the longitudinal and transverse directions. It goes without saying that other configurations are also possible.
  • the illustration according to FIG. 3 makes it clear that the secondary cutting insert 20 lies within a conical outer surface 28 which is spanned by the rotating main cutting edge 18.
  • the tip angle of the main cutting edge 18 can be, for example, 130 °, the dimensions being adaptable to the requirements over a wide range.
  • the removal of the minor cutting edge 30 of the minor cutting insert 20 from the conical lateral surface 28 can also be adapted to the requirements; if the secondary cutting edge moves back further, the clearing effect for the webs to be broken between the borehole grooves is correspondingly lower, while the load on the secondary cutting edge 30 is greatest when the secondary cutting edge 30 lies exactly in the conical lateral surface 28.
  • FIG. 4 Another embodiment of the rock drill 10 according to the invention can be seen in FIG. 4.
  • This rock drill 10 has a main cutting plate 16 which extends in a manner known per se across the drill head 12.
  • the secondary cutting plate 20 is likewise arranged offset with respect to a drill axis 32, the secondary cutting plate 20 extending obliquely to the main cutting plate 16.
  • the angle 34 between the main insert and the secondary insert is 34 ° in the example, it being understood that this angle can be adapted to the requirements over a wide range.
  • the secondary cutting insert 20 extends from the main cutting insert 16 up to the outer radius of the drilling head 12 and in the example even extends beyond the outer radius of the drilling head 12, but not beyond the outer radius of the main cutting insert 16.
  • the minor cutting edge has a length of approximately 60% of the length of the major cutting edge 18.
  • the minor cutting edge has a roof-shaped construction, viewed in cross section, towards the minor cutting edge 30, the front flank 36, which is known in the rotational direction, being steeper than the rear flank in the rotational direction 38.
  • a drilling dust removal groove 26 is provided to the side of the secondary cutting plate 20, which groove is concave in a manner known per se and in particular also serves for the removal of the drilling dust generated when the web is broken.
  • an opposite drilling dust removal groove 24 is of comparatively large design and extends fairly broadly and transversely across the drilling head as a circular section which is delimited by the main cutting plate 20.
  • the drill head can be designed to be weight-compensated in a manner known per se in order to avoid the formation of an imbalance. Due to the one-sided design of a secondary cutting plate 20, the effect produced there is comparatively large.
  • the drilling base 40 is shown in a schematic form.
  • Such a drilling base 40 is produced by an impact drilling machine with a division of six, 6 basic drilling grooves 42 extending in the drilling base 40 at uniform angular intervals, that is to say spaced 60 ° apart. Between In the case of conventional rock drills, the basic drilling grooves do not have ridges 44 which are somewhat wedge-shaped after the distance between adjacent drilling grooves on the outer circumference of the drilling ground 40 is greatest, while the basic drilling grooves 42 meet in the region of the drill axis 32.
  • the webs 44 are each hit and the rock there is shattered, an intervention in the drilling machine being unnecessary.
  • FIGS. 1 to 3 and according to FIG. 4 can also be combined, so that a particularly broad broaching effect is achieved.

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)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Steroid Compounds (AREA)
EP94100784A 1993-01-22 1994-01-20 Trépan de roche Expired - Lifetime EP0607958B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301708 1993-01-22
DE4301708A DE4301708C2 (de) 1993-01-22 1993-01-22 Gesteinsbohrer

Publications (2)

Publication Number Publication Date
EP0607958A1 true EP0607958A1 (fr) 1994-07-27
EP0607958B1 EP0607958B1 (fr) 1998-08-19

Family

ID=6478737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94100784A Expired - Lifetime EP0607958B1 (fr) 1993-01-22 1994-01-20 Trépan de roche

Country Status (4)

Country Link
EP (1) EP0607958B1 (fr)
AT (1) ATE169987T1 (fr)
DE (2) DE4301708C2 (fr)
DK (1) DK0607958T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1045112A1 (fr) * 1999-04-15 2000-10-18 HILTI Aktiengesellschaft Broche à pierre
EP1083294A1 (fr) * 1999-09-09 2001-03-14 HILTI Aktiengesellschaft Outil de forage
EP0884448A3 (fr) * 1997-06-10 2002-03-27 HILTI Aktiengesellschaft Trépan de roche avec rainures d'évacuation hélicoidales

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19653155C1 (de) * 1996-12-19 1998-07-09 Drebo Werkzeugfab Gmbh Gesteinsbohrer
DE19860528B4 (de) * 1998-12-30 2006-12-07 Robert Bosch Gmbh Gesteinsbohrer für Hammerbohrmaschinen
EP1431511B1 (fr) * 2002-12-19 2006-08-30 Robert Bosch Gmbh Foret à roche

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB530113A (en) * 1939-05-30 1940-12-05 Erhard Bertl Improvements relating to percussive drilling bits
CH272188A (de) * 1948-01-14 1950-12-15 Sandvikens Jernverks Ab Stossbohrkrone mit mindestens zwei Hartmetallschneideinsätzen.
FR986125A (fr) * 1948-05-13 1951-07-27 Boehler & Co Ag Geb Trépan à outils de taille en métal dur rapportés
DE918741C (de) * 1949-09-03 1954-10-04 Boehler & Co Ag Geb Gesteinsbohrer mit Einfach- oder Mehrfachschneiden
DE3820695A1 (de) * 1988-06-18 1989-12-21 Hawera Probst Kg Hartmetall Gesteinsbohrer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757076C (de) * 1936-11-18 1951-05-15 Erhard Dipl-Ing Bertl Gesteinsschlagbohrer mit radialen und exzentrisch gerichteten Hartmetallschneiden

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB530113A (en) * 1939-05-30 1940-12-05 Erhard Bertl Improvements relating to percussive drilling bits
CH272188A (de) * 1948-01-14 1950-12-15 Sandvikens Jernverks Ab Stossbohrkrone mit mindestens zwei Hartmetallschneideinsätzen.
FR986125A (fr) * 1948-05-13 1951-07-27 Boehler & Co Ag Geb Trépan à outils de taille en métal dur rapportés
DE918741C (de) * 1949-09-03 1954-10-04 Boehler & Co Ag Geb Gesteinsbohrer mit Einfach- oder Mehrfachschneiden
DE3820695A1 (de) * 1988-06-18 1989-12-21 Hawera Probst Kg Hartmetall Gesteinsbohrer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884448A3 (fr) * 1997-06-10 2002-03-27 HILTI Aktiengesellschaft Trépan de roche avec rainures d'évacuation hélicoidales
EP1045112A1 (fr) * 1999-04-15 2000-10-18 HILTI Aktiengesellschaft Broche à pierre
US6283232B1 (en) 1999-04-15 2001-09-04 Hilti Aktiengesellschaft Rock drill
EP1083294A1 (fr) * 1999-09-09 2001-03-14 HILTI Aktiengesellschaft Outil de forage
US6431295B1 (en) 1999-09-09 2002-08-13 Hilti Aktiengesellschaft Rock drill

Also Published As

Publication number Publication date
DE4301708C2 (de) 2002-10-31
DE59406700D1 (de) 1998-09-24
DK0607958T3 (da) 1998-10-26
EP0607958B1 (fr) 1998-08-19
DE4301708A1 (de) 1994-07-28
ATE169987T1 (de) 1998-09-15

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