EP0657617B1 - Trépan de roche - Google Patents

Trépan de roche Download PDF

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Publication number
EP0657617B1
EP0657617B1 EP94116965A EP94116965A EP0657617B1 EP 0657617 B1 EP0657617 B1 EP 0657617B1 EP 94116965 A EP94116965 A EP 94116965A EP 94116965 A EP94116965 A EP 94116965A EP 0657617 B1 EP0657617 B1 EP 0657617B1
Authority
EP
European Patent Office
Prior art keywords
cutting tip
main
drill
drill head
main 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
EP94116965A
Other languages
German (de)
English (en)
Other versions
EP0657617A1 (fr
Inventor
August Haussmann
Bernhard Moser
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.)
Robert Bosch Power Tools GmbH
Original Assignee
Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Hawera Probst 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 Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG, Hawera Probst GmbH filed Critical Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Publication of EP0657617A1 publication Critical patent/EP0657617A1/fr
Application granted granted Critical
Publication of EP0657617B1 publication Critical patent/EP0657617B1/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
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • 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.
  • the rock drills with carbide inserts become Production of holes in concrete, masonry, stone or the like used.
  • the drill head is on his Front with at least one, generally about the carbide inserts extending over the entire drill head diameter provided by the rotary hammer drill bit a kind of chisel effect on the earthenware to be crushed.
  • the borehole diameter is determined by the outer diameter of the carbide insert certainly.
  • Such tools have the disadvantage that the Cutting only one insert, especially on the outside Area of high wear due to high stress are subjected so that the drilling progress decreases quickly.
  • Cross cutting elements To the surface pressure on a single carbide insert to reduce and thus the standing sides of the To enlarge the drill head are so-called Cross cutting elements became known, in which perpendicular to one main insert two Additional cutting plates are arranged (DE-A1 29 12 394).
  • the cross section of this known tool is the drill head approximately rectangular, with one in itself circular basic cross-section with side flats for the formation of large-scale drilling dust grooves.
  • the Cross cutting elements symmetrical and centered in the approx rectangular cross section used, d. H. the The main insert runs in the middle and parallel to the two Drill dust removal grooves.
  • Such an arrangement of a drill head with a parallel to the lateral drilling dust groove surfaces arranged main cutting plate and perpendicular to it standing secondary cutting inserts has the disadvantage that especially the secondary cutting inserts due to the rectangular cross-sectional shape of the drill head just a very have a short length so as not to go too far into the To protrude the drilling dust groove space.
  • the one in her Effective diameter of shorter secondary cutting inserts consequently the main insert in the diameter range do not support in which the diameter of the Main insert the diameter of the secondary insert towered over. But it is precisely the radially outer ones Areas of the main insert that are supported by the secondary cutting inserts to improve the removal work need.
  • a drill for rotary hammers become known in which a drill head is an X-shaped trained drill bit has a center provided centering point.
  • the carbide cutting edge is integrally formed, the X-shaped arrangement of the Tungsten carbide insert in top view V-shaped drilling dust grooves allowed.
  • the invention has for its object a Drill head geometry of the publications mentioned at the beginning to improve that a drilling tool with as much as possible large drilling dust removal grooves is created, wherein Cross cutting elements with optimal effect and tool life are integrated. Furthermore, the drill head geometry should be such be trained that a problem-free Manufacturing process while improving the Sets efficiency.
  • the invention is based on the main idea that a The largest possible drilling dust removal groove can be achieved in this way is when the cross section of the drill head is approximately rectangular or diamond-shaped, the to Drill longitudinal axis preferably aligned parallel Side flanks of the drilling dust groove in the direction of rotation of the drilling tool are arranged leading to the main insert and the Drill dust groove positioned immediately in front of the main insert is. This results in a large volume for the removal of the drilling dust removed by the main cutting plate.
  • Outside diameter of the secondary cutting inserts is approximately the same size or is only slightly smaller than that Diameter of the main insert, which is the nominal diameter forms.
  • the main insert is also in your radially outer area effective through the Auxiliary cutting inserts, especially for axial drilling dust removal supported. From this knowledge emerges one Largely diagonal arrangement of the main insert as well as the aligned secondary cutting inserts, which are about the Corner points of an approximately rectangular or diamond-shaped Cross section of the drill head. This will make the in the described prior art at right angles to each other intended arrangement of the main insert and Leave secondary insert and an asymmetrical Head geometry chosen, so that it is one in the invention acute angle between the main insert and the Main insert comes after secondary inserts.
  • the main insert and especially the Secondary inserts over almost their entire length in Drill head optimally embedded for support. this applies especially for those facing away from the load Backs of the inserts, however, soldering Special features have to be considered.
  • the asymmetrical distribution of the inserts has above that irregular action of the cutting edges rotational impact drilling resulting in the removal rate significantly improved and the vibrations on the tool and thus be significantly reduced on the machine. This results in an improvement in handling by the operator.
  • the cutting edges With a symmetrical arrangement of the inserts the cutting edges always in previously produced chisel notches act and thus to a vibration superposition and Reduce drilling performance. This is through the Lawfulness of fixed, more predetermined Rotational speed / impact ratio of the hammer drill caused. This regularity is due to an asymmetrical arrangement the inserts interrupted.
  • the stone drill In the manufacture of the stone drill according to the invention also manufacturing technology and especially soldering technology Conditions to be taken into account. This applies in particular to soldering the main insert and the Secondary cutting inserts in the drill head.
  • the inserts are in its radially outer area when drilling particularly stressed so that the soldering high Requirements must be sufficient for the durability of the soldered inserts is guaranteed. this will by taking correct mass ratios of the Drill head on both sides of the respective insert considered. It is preferably also a Optimized drilling dust transport.
  • Rock drill 1 shown in plan view consists of a Drill head 2 with subsequent, in particular double-start feed screw 3 and a clamping shaft 4.
  • the drill head On its axially forward end face 5, the drill head has a main cutting plate 6 which extends over the entire diameter D of the drill head 2, the diameter D forming the borehole diameter or nominal diameter.
  • the main cutting plate 6 is inclined in a roof shape with a tip angle ⁇ ⁇ 130 ° and has individual cutting edges 7, 8 which are arranged at 180 ° to one another.
  • the main cutting plate 6 has a plate thickness s 1 and a height of h 1 . It is soldered into a continuous groove 9 in the drill head 2.
  • the individual cutting edges 7, 8 of the main cutting plate 6 each have a roof-shaped ground section 10, as is shown from the direction of the narrow end side (arrow 11).
  • the rock drill 1 also has two secondary cutting plates 12, 13, which are arranged at an acute angle ⁇ 1 to the leading main cutting plate 6, the angle ⁇ 1 being approximately ⁇ 1 ⁇ 60 to 90 ° and in particular ⁇ 1 ⁇ 75 °.
  • the two secondary cutting plates 12, 13 are likewise designed as roof-shaped cutting elements in a side view, as is explained in more detail in the applicant's EP 0 322 565 B1. We therefore refer to this publication.
  • the secondary cutting plates 12, 13 therefore represent a reduced embodiment of the main cutting plate 6.
  • the cross section of the drilling head 2 is essentially rectangular, this cross section being made by flattening a circular cylindrical cross section with the diameter d 1 at the side , the diameter d 1 corresponds to the spiral shaft diameter d 1 of the conveying spiral 3.
  • two laterally opposite circular segments 14 are cut off, so that there are two opposite, largely axially parallel side flanks 15, 16 with a side length l 1 , the segments 14 forming part of the drilling dust groove.
  • the approximately rectangular cross section of the drill head is accordingly formed by the two opposite side flanks 15, 16 and by the two circular arc sections 17, 18 connecting the side flanks 15, 16, which lie on the circle with the diameter d 1 .
  • the side flanks 15, 16 can also have a light convex (16 ′′′) or light concave (16 ") outer surface.
  • the two end points of the side flank 15 are provided with reference symbols 19, 20, the two end points of the side flank 16 with the reference symbols 21, 22 in FIG. 3.
  • the connection of the two opposite side points 19, 22 forms the chord 23.
  • a chord 24 is formed by the connection of the corner points 20, 21.
  • the length l 2 of the two tendons 23, 24 and thus the distance l 2 of the two parallel side flanks 15, 16 is approximately the same as the length l 1 of the side flanks 15, 16 themselves (l 1 ⁇ l 2 ), ie the Corner points 19 to 22 lie approximately on a square cross section.
  • the rectangular cross section is formed by a lateral attachment of circular segment sections 25, 26 to form the two circular arc sections 17, 18.
  • the cross section of the drill head can, however, also be designed to be even more elongated, where l 1 > l 2 .
  • the passage area of the circular segments 14 becomes larger and the areas of the circular segment sections 25, 26 become smaller. This increases the drilling dust removal groove.
  • the main cutting plate 6 lies diagonally in the square or rectangle formed by the corner points 19 to 22.
  • the main cutting plate 6 connects approximately the corner points 19, 21, ie the chip space 27 formed, inter alia, by the circular segment surface 14 lies ahead of the main cutting edge 10 of the main cutting plate 6 with respect to the direction of rotation 28 of the tool.
  • the radially outer cutting edge 36 of the main cutting plate 6 protrudes far into the Bohrmehlnuten Scheme 27 (width s 3 in Fig. 1), so that a high clearing work can be achieved.
  • the main cutting insert performs its main removal work, it is exposed in the direction of the drill bit groove in order to optimally convey the drill bit into the drill bit groove.
  • the main cutting plate 6 is optimally supported in the drill head.
  • the main cutting plate 6 has a diameter D, which leads to a borehole diameter d.
  • the chip space 27 located in front of the side flanks 15, 16 is accordingly formed by the circular segment sections 14 with the circular diameter d 1 plus a circular ring section 29 with the diameter d.
  • the diameter D of the main insert 6 or the associated circle with the diameter d forms the nominal borehole diameter.
  • the lateral protrusion over the helix diameter d 1 is chosen in a known manner.
  • the angle ⁇ 3 between the vertical plane 32 leading through the corner points 19, 21 and the vertical plane 31 leading through the corner points 20, 22 is approximately ⁇ 3 ⁇ 90 °.
  • the leading main cutting insert and the trailing secondary cutting insert form an acute angle ⁇ 1 .
  • the diameter d 3 of the two aligned secondary cutting plates 12, 13 is the same size or slightly smaller than the diameter D of the main cutting plate 6 (d 3 ⁇ D).
  • the diameter d 3 is preferably chosen to be somewhat smaller than the diameter of the main cutting plate 6 in order to essentially leave the radial clearing work to the main cutting plate 6 which is thicker in thickness s 1 .
  • Fig. 3 the radially outer areas of the Inserts 12, 13 with reference numeral 33, the radial inner areas marked with reference numeral 34.
  • the radially outer regions 33 lie on the same Tapered surface 35 by the circumferential cutting edge of the Main cutting plate 6 is formed (Fig. 1).
  • the two inner regions 34 of the respective secondary cutting insert 12, 13 run corresponding to one of the main cutting plate 6 corresponding roof angle ⁇ towards the center of the drill below.
  • the radially inner regions 34 can, however, from the center of the respective secondary cutting insert also horizontally run to the center of the drill.
  • FIG. 4 is another embodiment of the Invention presented, in which the consistent Further development of a head geometry according to the 3 in particular also in soldering technology was made. Same parts are provided with the same reference number so that on the Description of the embodiment of FIG. 3rd explicit reference is made.
  • the top view The rock drill shown in FIG. 4 has a drill head 2 ', which has an approximately diamond-shaped cross section, the corner points of the rhombus with the reference numerals 40 to 43 Marked are.
  • the line connecting the diamond points 40, 41 forms the side flank 15 'of the drill head Formation of Bohrmehlnut or the chip space 27 ', the Connection line of the corner points 42, 43 forms equally the side flank arranged parallel to the side flank 15 ' 16 'to form the opposite chip space 27'.
  • the respective chip space lies within that of the perimeter circle segments 14 formed with diameter D.
  • the two corner points 41, 43 lie outside the circumference formed by the nominal diameter D, while the two corner points 40, 42 of the rhombus lie within the drill head diameter d 1 .
  • the connecting line 44 of the two diamond corner points 40, 42 and the connecting line 45 of the two diamond corner points 41, 43 form a diamond cross, which runs through the center 46 of the drill head cross section or the longitudinal axis of symmetry of the drilling tool.
  • the connecting line 44 is almost perpendicular to the longitudinal plane of symmetry 47 through the secondary cutting plates 12, 13, while the connecting line 45 forms an angle ⁇ 4 ⁇ 2 to 5 ° to this.
  • the axes 44, 45 are therefore not perpendicular to one another.
  • the area between the respective secondary cutting insert 12, 13 and the leading main cutting insert 7, 8 is designed in the embodiment according to FIG. 4 in such a way that an arcuate course 48 initially results over approximately one third of the intermediate segment segment section, which extends up to point 49 on the circumference of the drill head 50 with the diameter d 1 is sufficient. From this point 49, the two axially parallel side flanks 37 ', 38' run on the diamond connecting line 41, 42 and 40, 43 to form the drill head. The side surfaces 37 ', 38' run parallel to one another. This results in an additional chip space or drilling dust space 51, 52 which lies between the side flanks 37 ', 38' and the circumference formed by the outer diameter D.
  • the arrangement of the main insert 6 in the area of the indicated diamond head diamond is accordingly such that the drill head opens completely into a side flank 37 ', 38', so that this side flank is extended on the opposite side of the main insert by the amount s 2 .
  • the side flanks and in particular the front cutting edges 53, 54 of the side cutting edges 7, 8 consequently do not run through the corners 40, 42 of the diamond cross section, but are slightly set back relative to this by the amount s 2 . This creates stable, defined edges and surfaces for the soldering process, which prevent a thermally unfavorable tip from being present here.
  • the side flanks 15 ', 16' lie for formation the main drilling dust grooves and the side flanks 37 ', 38' for Formation of secondary drilling dust grooves 51, 52 each axially parallel and altogether parallel to each other, so that these in one manufacturing process can be produced per pair of pages.
  • the arrangement of the secondary cutting plates 12, 13 aligned with one another with their longitudinal plane of symmetry 47 compared to the arrangement of the main cutting plate with their longitudinal plane of symmetry 32 is in turn predetermined by the angle ⁇ 1 ⁇ 70 °.
  • the outer diameter of the secondary cutting inserts 12, 13 lies approximately on the outer diameter D of the main cutting insert.
  • the secondary cutting inserts lie approximately with their longitudinal symmetry plane 47 in the region of the longitudinal axis 45 of the diamond, the longitudinal axis 45 of the diamond being arranged in the direction of rotation 28 of the drilling tool by the angle ⁇ 4 .
  • the secondary cutting plates 12, 13 are embedded in the circular arc continued by the circular segment section 48 on both flanks, the end points 55, 56 on the circular arc simultaneously representing the end point of the side flanks 15 ', 16' in FIG. 4.
  • the arc section 49, 55 or 49, 56 is characterized by ⁇ 6 ⁇ 30 °.
  • the angle ⁇ 7 ⁇ 20 ° indicates the leading angle from the longitudinal plane of symmetry 47 of the secondary cutting plates 12, 13 to the angle beam 57 through the point 49.
  • the side flanks 37 ', 38' start from this point 49.
  • the drill head diameter d 1 in FIG. 4 also forms the helical shank diameter, as shown in FIG. 1.

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  • 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)
  • Drilling Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Claims (13)

  1. Fleuret à rocher pour des foreuses à marteau, comportant une hélice de transport (3) à filetage simple ou multiple, et une tête de forage (2) formée à partir d'une section transversale de tête de forage cylindrique circulaire, sur la face frontale (5) de laquelle est agencée une plaque de coupe principale (6) en métal dur ou analogue, s'étendant sur tout le diamètre de la tête de forage (2), inclinée en forme de toit en vue de côté, et présentant deux tranchants (7, 8), plaque qui dépasse radialement le contour périphérique de la tête de forage (2), et des plaques de coupe auxiliaires, agencées transversalement à celle-ci, et réalisées en une ou plusieurs pièces, une tête de forage (2) en forme de rectangle ou analogue à un losange présentant deux flancs latéraux (15,16) opposés, généralement parallèles à l'axe, aplatis, pour former des rainures (14,27) pour la poussière de forage et étant traversée sensiblement en diagonale par la plaque de coupe principale (6) ainsi que les plaques de coupe auxiliaires (12,13), caractérisé en ce que, entre la plaque de coupe principale (6) et les plaques de coupe auxiliaires (12,13), il est formé un angle aigu β1 ≈ 60° à 90°, et en ce que des tronçons de segments de cercle (25,26) opposés, de même en partie aplatis, sont présents, lesquels servent à encastrer ou supporter des deux côtés la plaque de coupe principale et/ou les plaques de coupe auxiliaires (6,12,13).
  2. Fleuret à rocher selon la revendication 1,
    caractérisé en ce que la plaque de coupe principale (6) et, avantageusement, les plaques de coupe auxiliaires (12,13), par leur zone à chaque fois radialement externe, sont supportées et encastrées, au moins sur leurs faces latérales opposées à l'action des forces, dans la tête de forage (2).
  3. Fleuret à rocher selon la revendication 1 ou 2,
    caractérisé en ce que les flancs latéraux (15,16) présentent une longueur I1 qui correspond, à chaque fois, à la distance (12) des flancs latéraux (15,16) l'un par rapport à l'autre (I1 ≈ I2).
  4. Fleuret à rocher selon une des revendications précédentes 1 à 3,
    caractérisé en ce que l'angle entre la plaque de coupe principale avant (6) et les plaques de coupe auxiliaires arrière (12,13) vaut β1 ≈ 75°.
  5. Fleuret à rocher selon une des revendications précédentes 1 à 4,
    caractérisé en ce que le diamètre externe D de la plaque de coupe principale est supérieur ou égal au diamètre externe d3 de la plaque de coupe auxiliaire alignée (12,13) (D ≥ d3).
  6. Fleuret à rocher selon la revendication 5,
    caractérisé en ce que le diamètre d3 des plaques de coupe auxiliaires (12,13) correspond sensiblement au diamètre externe d1 de la tête de forage (2).
  7. Fleuret à rocher selon une des revendications précédentes 1 à 6,
    caractérisé en ce que les flancs latéraux (15,16), pour former les rainures (27) pour la poussière de forage, sont réalisés de façon plane ou cintrés de façon convexe (16') ou en étant courbés de façon concave (16").
  8. Fleuret à rocher selon une des revendications précédentes 1 à 7,
    caractérisé en ce que les plaques de coupe auxiliaires (12,13) sont réalisées comme plaques individuelles en forme de toit en vue latérale en largeur, les zones radialement externes (33) se trouvant sur la même surface d'enveloppe conique (35), comme les tranchants (7,8) de la plaque de coupe principale (6).
  9. Fleuret à rocher selon une des revendications précédentes 1 à 8,
    caractérisé en ce que l'épaisseur de paroi s1 de la plaque de coupe principale est plus grande que l'épaisseur de paroi s2 des plaques de coupe auxiliaires.
  10. Fleuret à rocher selon la revendication 1,
    caractérisé en ce que la section transversale de la tête de forage est réalisée de façon analogue à un losange, deux pointes opposées (41,43) du losange étant coupées ou arrondies par la circonférence d1 pour former le diamètre de tête d1 et, avantageusement, le plan longitudinal de symétrie vertical (47) passant par les plaques de coupe auxiliaires (12,13) sensiblement par les pointes de losange coupées.
  11. Fleuret à rocher selon la revendication 10,
    caractérisé en ce que l'axe transversal du losange (44) et ses coins (40,42) se trouvent à l'intérieur de la circonférence formée par le diamètre externe d1 de la tête de forage.
  12. Fleuret à rocher selon la revendication 10 ou 11,
    caractérisé en ce que la tête de forage présente deux flancs latéraux (15',16') sensiblement parallèles à l'axe pour former un logement de copeaux principal (27') devant la plaque de coupe principale (6) et deux flancs latéraux (37',38') de même sensiblement parallèles à l'axe, pour former des rainures auxiliaires (51,52) pour la poussière de forage.
  13. Fleuret à rocher selon une des revendications précédentes 10 à 12,
    caractérisé en ce que la plaque de coupe principale (6) avec sa largeur totale s1 débouche totalement à l'intérieur d'une surface latérale (40,43 ou 41,42) du losange, des rapports de masse le plus possible identiques de la tête de forage existant latéralement à la plaque de coupe principale et/ou à la plaque de coupe auxiliaire.
EP94116965A 1993-12-11 1994-10-27 Trépan de roche Expired - Lifetime EP0657617B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4342324 1993-12-11
DE4342324 1993-12-11
DE4407119A DE4407119A1 (de) 1993-12-11 1994-03-04 Gesteinsbohrer
DE4407119 1994-03-04

Publications (2)

Publication Number Publication Date
EP0657617A1 EP0657617A1 (fr) 1995-06-14
EP0657617B1 true EP0657617B1 (fr) 1999-08-18

Family

ID=25931992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116965A Expired - Lifetime EP0657617B1 (fr) 1993-12-11 1994-10-27 Trépan de roche

Country Status (5)

Country Link
US (1) US5482124A (fr)
EP (1) EP0657617B1 (fr)
CN (1) CN1056900C (fr)
DE (2) DE4407119A1 (fr)
DK (1) DK0657617T3 (fr)

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US9347276B2 (en) 2013-04-26 2016-05-24 Kennametal Inc. Two prong rotary drill bit with cutting insert having edge preparation
US9428968B2 (en) * 2013-04-26 2016-08-30 Kennametal Inc. Rotary drill bit with cutting insert having edge preparation
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7137461B2 (en) 2002-10-03 2006-11-21 Black & Decker, Inc. Masonry drilling tool

Also Published As

Publication number Publication date
DE4407119A1 (de) 1995-06-14
CN1107201A (zh) 1995-08-23
DK0657617T3 (da) 2000-03-20
CN1056900C (zh) 2000-09-27
DE59408638D1 (de) 1999-09-23
US5482124A (en) 1996-01-09
EP0657617A1 (fr) 1995-06-14

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