EP0322565B1 - Trépan de roche - Google Patents

Trépan de roche Download PDF

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Publication number
EP0322565B1
EP0322565B1 EP88119572A EP88119572A EP0322565B1 EP 0322565 B1 EP0322565 B1 EP 0322565B1 EP 88119572 A EP88119572 A EP 88119572A EP 88119572 A EP88119572 A EP 88119572A EP 0322565 B1 EP0322565 B1 EP 0322565B1
Authority
EP
European Patent Office
Prior art keywords
cutting
main
drill bit
cutting plate
plates
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
EP88119572A
Other languages
German (de)
English (en)
Other versions
EP0322565A1 (fr
Inventor
Bernhard Moser
Wolfgang Dipl.-Ing. Peetz
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 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 GmbH filed Critical Hawera Probst GmbH
Publication of EP0322565A1 publication Critical patent/EP0322565A1/fr
Application granted granted Critical
Publication of EP0322565B1 publication Critical patent/EP0322565B1/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.
  • Rock drills with carbide inserts are used to drill holes in concrete, masonry, stone or the like.
  • cross-cutters In order to reduce stress and thus wear on the hard metal cutting plate arranged transversely in the drill head, so-called cross-cutters have become known, with a roof-shaped inclined main cutting insert extending over the entire diameter of the drill head and secondary cutting inserts arranged transversely thereto.
  • Such a drill is shown, for example, in US Pat. No. 2,673,716, in particular FIG. 2.
  • the cross-cutting inserts can also be formed from two mutually perpendicular plates with corresponding incisions.
  • the secondary cutting inserts consist of two parts which, when put together, would result in a symmetrical, roof-shaped cutting insert.
  • the tip of each secondary cutting insert pointing in the direction of drilling feed is accordingly arranged as directly as possible next to the main cutting edge for a stepless transition (US Pat. No. 2,673,716, FIG. 3).
  • a drilling tool has become known from DE 35 44 433-A1, with a main cutting edge penetrating the drill head diameter and additional cutting pins which are arranged radially off-center.
  • the invention has for its object to improve such tools and in particular to propose a drill head geometry for a cross-cutting head, which has a higher wear resistance with improved drilling feed when struck or hammering.
  • the measures should be carried out as inexpensively as possible.
  • a high chisel effect is generated by a high surface pressure when striking or hammering, i. H. the striking stress must be carried out with the smallest possible chisel surface and high impact force.
  • the carbide cutting element is extremely resilient and wear-resistant in relation to the pure impact stress. H. Little wear occurs in the area of the drill center axis with lower cutting speeds than radially outside.
  • each auxiliary cutting insert is also provided with a chisel tip according to the invention, which is achieved by a roof-shaped design of the auxiliary cutting insert, so that the auxiliary cutting insert represents a geometric reduction of the main cutting insert.
  • the tip of the roof-shaped main cutting plate acts in the central area alone, since this results in a high surface pressure and thus a good chiseling effect. Only in the radially further outer area does the additional effect of the roof-shaped secondary cutting insert begin, which then also promotes penetration into the material to be machined with its chisel tip and leads to an improved explosive effect in the rock. The radially further outer area of the main cutting plate is thus relieved by the secondary cutting plate, so that overall less wear occurs with improved efficiency.
  • the design of the drill according to subclaim 2 has the advantage that, with a symmetrical design of the secondary cutting insert, standard commercial parts which are available as a mass product can be used. As a result, the cost of producing the rock drill according to the invention is considerably reduced. In addition, less is required due to the use of roof-shaped secondary cutting inserts Tungsten carbide material than when the secondary cutting edge is continued up to the center of the drill head. This also reduces the cost of production.
  • the secondary cutting insert can also be designed asymmetrically, the part facing the main cutting insert can be shortened. However, the chisel tip of the secondary cutting insert must be preserved.
  • the cutting of the main and secondary cutting elements pointing in the drilling feed direction lie on a common cutting cone surface. This is useful in order to use the chisel tip of each secondary cutting insert equally and simultaneously with the main cutting insert when penetrating into the material to be drilled.
  • the chisel tips of the secondary cutting plates and the corresponding arrangement in the common cutting cone surface improve the penetration behavior and the blasting effect.
  • the axial groove depth for the main cutting insert is larger than that of the secondary cutting insert.
  • this has the advantage that the groove base of the main cutting insert and that of the secondary cutting inserts lie at different axial heights, as a result of which the cross section of the drill head is not unnecessarily weakened by the grooves at a cutting height.
  • auxiliary cutting inserts can also be made in one piece in special cases, with corresponding incisions in the main and auxiliary cutting insert.
  • the secondary cutting insert is immediately adjacent to the main cutting insert.
  • the secondary cutting insert can also be made narrower and form a distance from the main cutting insert. If you halved each secondary cutting insert again, an acute angle would result as the chisel angle of the secondary cutting insert. This would result in a material saving of hard metal, but the wear of the respective chisel tip would increase.
  • the tip of each asymmetrical secondary insert should therefore also form an obtuse angle as that of the main insert, so that the minimum width is determined thereby.
  • the cross cutting inserts formed from main and secondary cutting inserts, are used in a drill head with a square or circular cross section.
  • the design of the drill head determines the face resistance and the drilling dust grooves in the area of the drill head for the removal of the cuttings.
  • the secondary cutting insert and / or the main cutting insert can be designed in a zigzag shape on its cutting surface in order to form a plurality of chisel tips for each insert.
  • the drill head is designated by reference number (2) and the conveying spiral or the spiral shaft is designated by reference number (3).
  • the conveyor helix (3) can be single-start or double-start.
  • the drill head (2) has a roof-shaped inclined main cutting plate (4) which extends over the entire diameter d 1 of the drill head and is designed in a manner known per se.
  • the tip angle ⁇ is formed as an obtuse angle, with a size of ⁇ ⁇ 130 °.
  • the main insert (4) has cutting edges (5) and a plate thickness s 1 and a height h 1 and is inserted into a groove (6) with the groove depth t 1 in the drill head (2).
  • the rock drill (1) has two secondary cutting plates (7, 8) which are arranged transversely to the main cutting plate (4) next to the latter.
  • Characteristic of the secondary cutting plates (7, 8) is the symmetrical design of these cutting elements with the axis of symmetry (9) and the roof-shaped design of the respective cutting edges (10) with the chisel tips (16).
  • the cutting conical surface (11) of the main cutting insert corresponds to the cutting conical surface of the secondary cutting inserts (7, 8), ie the cutting surfaces of the main and secondary cutting inserts lie in the same cutting plane.
  • the tip angle ⁇ of the main cutting insert is approximately the same size as the tip angle ⁇ of the secondary cutting insert (7, 8).
  • the solder gap between the secondary cutting inserts (7, 8) and the main cutting insert (4) must also be taken into account.
  • the height h2 of the secondary cutting plates (7, 8) is made smaller than the height h1 of the main cutting plate. This results in a smaller groove t2 of the associated groove.
  • the groove base (12) for the main cutting insert (4) lies much deeper in the drill head than the groove base (13) of the secondary cutting insert (7, 8). This avoids a cross-sectional weakening of the drill head.
  • the drill head can have a circular cross-section (14) (shown in dashed lines) or a square cross-section (15).
  • the main cutting insert (4) and the two secondary cutting inserts (7, 8) arranged transversely thereto are always inserted in this cross section.
  • the roof-shaped design of the secondary cutting inserts gives rise to the radially outer chisel tips (16) in the middle of the cutting edges (10) of the secondary cutting inserts (7, 8).
  • the outer diameter d 1 of the main insert (4) normally corresponds to the outer diameter d 1 formed by the two secondary inserts (7, 8). In special cases, however, the nominal diameter d 1 formed by the main cutting plate (4) can be larger than the circumferential diameter of the two secondary cutting plates (7, 8).
  • Fig. 3b the main cutting plate (4) and the secondary cutting plates (7, 8) are aligned in a drill head (2) with a square cross section perpendicular to the side edges instead of the diagonal arrangement according to Fig. 3a.
  • FIG. 3c shows the arrangement of the main cutting plate (4) and secondary cutting plates (7, 8), with the cutting edges (5) and (10) of the cutting plates and the radially outwardly displaced chisel tips (16) through the roof-shaped arrangement of the secondary cutting plates (7, 8).
  • the drill head shape according to FIG. 3d represents a further variant of a cross cutting head, the main cutting plate (4) and the secondary cutting plates (7, 8) in turn being provided in a roof-shaped configuration.
  • all of the cutting plates (4 or 7, 8) are designed as standard parts or standard parts, as a result of which the production is cheaper.

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

Claims (8)

  1. Fleuret à rocher pour des foreuses à marteau, comportant un arbre hélicoïdal à un ou deux filets et au moins une plaque de coupe principale en métal dur, présentant des tranchants ou lames, inclinée en forme de toit, symétrique en coupe axiale par rapport à la pointe du fleuret, et s'étendant sur tout le diamètre de la tête du fleuret, plaque de coupe qui forme un angle obtus (α), et des plaques de coupe auxiliaires en une ou plusieurs pièces, agencées transversalement à celle-ci, pour former une tête de coupe en croix,
    caractérisé en ce que chaque plaque de coupe auxiliaire (7,8), agencée latéralement à la plaque de coupe principale (4), est réalisée de même sous forme d'un élément de coupe en forme de toit en coupe axiale, avec une pointe (16) formant un angle obtus (β), et en ce que les tranchants ou lames (5), orientés dans la direction d'avance du fleuret, de la plaque de coupe principale (4) et les deux tranchants ou lames (10), radialement externes, des deux plaques de coupe auxiliaires (7,8) sont agencés sur une surface d'enveloppe conique commune (11) d'angle (α).
  2. Fleuret selon la revendication 1,
    caractérisé en ce que la réalisation en forme de toit des plaques de coupe auxiliaires (7,8) est symétrique (axe de symétrie 9) ou asymétrique.
  3. Fleuret selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que la profondeur t₂ de la gorge pour les plaques de coupe auxiliaires (7,8) est plus petite que la profondeur t₁ de la gorge pour la plaque de coupe principale (4), dans un rapport d'avantageusement environ t₁ : t₂ = 2 : 1.
  4. Fleuret selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que les plaques de coupe auxiliaires (7,8) sont réalisées en une seule pièce avec des entailles dans les plaques de coupe auxiliaires et principale.
  5. Fleuret selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que les plaques de coupe auxiliaires (7,8) sont raccordées à la plaque de coupe principale (4) par l'intermédiaire d'une fente de brasage.
  6. Fleuret selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que les plaque de coupe en croix (4,7,8) sont agencées dans une tête de fleuret (2) ayant une section transversale quadratique ou circulaire ou rectangulaire ou en forme d'étoile.
  7. Fleuret selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que les plaques de coupe auxiliaires (7,8) et/ou la plaque de coupe principale (4) présentent des tranchants ou lames en zigzag, pour former plusieurs pointes de coupe.
  8. Fleuret selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que les plaques de coupe auxiliaires (7,8) constituent une réduction géométrique de la plaque de coupe principale (4).
EP88119572A 1987-12-16 1988-11-24 Trépan de roche Expired - Lifetime EP0322565B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873742661 DE3742661A1 (de) 1987-12-16 1987-12-16 Gesteinsbohrer
DE3742661 1987-12-16

Publications (2)

Publication Number Publication Date
EP0322565A1 EP0322565A1 (fr) 1989-07-05
EP0322565B1 true EP0322565B1 (fr) 1993-01-20

Family

ID=6342759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119572A Expired - Lifetime EP0322565B1 (fr) 1987-12-16 1988-11-24 Trépan de roche

Country Status (3)

Country Link
US (1) US4903787A (fr)
EP (1) EP0322565B1 (fr)
DE (2) DE3742661A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4407119A1 (de) * 1993-12-11 1995-06-14 Hawera Probst Kg Hartmetall Gesteinsbohrer

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442266A1 (de) * 1994-11-28 1996-05-30 Hilti Ag Werkzeug mit Trägerkörper und Schneidkörper
TW299385B (en) 1994-12-12 1997-03-01 Black & Decker Inc Cutting tools for drilling concrete, aggregate, masonry or the like materials
US5918105A (en) * 1994-12-12 1999-06-29 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
DE19516270C1 (de) * 1995-05-09 1997-01-30 Heller Dinklage Gmbh Geb Bohrwerkzeug
DE19522033A1 (de) * 1995-06-17 1996-12-19 Hilti Ag Verfahren zur Herstellung von Drehbohrwerkzeugen
DE19545648A1 (de) * 1995-12-07 1997-06-12 Hilti Ag Drehschlag-Wendelbohrer
DE19807394A1 (de) * 1998-02-21 1999-08-26 Hilti Ag Bohr- und/oder Meisselwerkzeug
DE19942987A1 (de) 1999-09-09 2001-03-15 Hilti Ag Bohrwerkzeug
DE19942986A1 (de) * 1999-09-09 2001-03-15 Hilti Ag Bohrwerkzeug
DE19942985A1 (de) * 1999-09-09 2001-03-15 Hilti Ag Bohrwerkzeug
US7097396B1 (en) * 2000-02-16 2006-08-29 Kabushiki Kaisha Miyanaga Drill bit
DE10024433A1 (de) * 2000-05-19 2001-11-29 Hawera Probst Gmbh Gesteinsbohrer
DE10351183A1 (de) 2003-11-03 2005-06-02 Illinois Tool Works Inc., Glenview Gesteinsbohrer
JP2006205277A (ja) * 2005-01-26 2006-08-10 Nachi Fujikoshi Corp 穴あけ工具
US7861807B2 (en) * 2008-12-03 2011-01-04 Black & Decker Inc. Drill bit including one piece cutting head
EP2669033B1 (fr) 2012-05-29 2015-11-04 Black & Decker Inc. Tête de coupe pour un foret.
US9981406B2 (en) * 2015-06-25 2018-05-29 Black & Decker Inc. Drill bit
CN107120065B (zh) * 2017-07-06 2024-01-30 中铁八局集团昆明铁路建设有限公司 一种地连墙施工斜岩槽段矩形冲击钻钻头和施工方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4407119A1 (de) * 1993-12-11 1995-06-14 Hawera Probst Kg Hartmetall Gesteinsbohrer
CN1056900C (zh) * 1993-12-11 2000-09-27 豪沃拉普鲁布斯特有限公司及两合公司 岩石钻

Also Published As

Publication number Publication date
DE3877732D1 (de) 1993-03-04
EP0322565A1 (fr) 1989-07-05
DE3742661A1 (de) 1989-07-13
US4903787A (en) 1990-02-27

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