EP0778390B1 - Perceuse rotative hélicoidale à percussion - Google Patents

Perceuse rotative hélicoidale à percussion Download PDF

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Publication number
EP0778390B1
EP0778390B1 EP96810629A EP96810629A EP0778390B1 EP 0778390 B1 EP0778390 B1 EP 0778390B1 EP 96810629 A EP96810629 A EP 96810629A EP 96810629 A EP96810629 A EP 96810629A EP 0778390 B1 EP0778390 B1 EP 0778390B1
Authority
EP
European Patent Office
Prior art keywords
shaft
pinshaped
guiding elements
casing
embedded
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
EP96810629A
Other languages
German (de)
English (en)
Other versions
EP0778390A2 (fr
EP0778390A3 (fr
Inventor
Werner Kleine
Werner Bongers
Axel Neukirchen
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP0778390A2 publication Critical patent/EP0778390A2/fr
Publication of EP0778390A3 publication Critical patent/EP0778390A3/fr
Application granted granted Critical
Publication of EP0778390B1 publication Critical patent/EP0778390B1/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 rotary impact twist drill according to the generic Preamble of claim 1.
  • Rotary impact twist drills are drilling tools that are used in conjunction with axial impact assisted Rotary drilling rigs are used. In particular, it concerns in usually around rock or masonry drills that are used for the rotary impact creation of holes or breakthroughs in concrete or masonry can be used.
  • a rotary impact twist drill is known which has a shaft has at least one lead in its coat, spiraling from the shaft end runs in the direction of the insertion end of the tool. Are at the end of the shaft Carbide cutting edges are provided, which are in front of the end face of the shaft end. The cutting edges are arranged on hard metal pins, which come from the end face of the Stick out.
  • the known rotary impact twist drill at least one central hard metal pin and two on a diameter of Shanked opposing peripheral hard metal pins.
  • the peripheral carbide pins are set back from the central pin and are of the same type inserted into the end face of the shaft end that they are radial over their entire length protrude over the outer surface of the shaft. They have a polygonal one Cross-sectional profile and are used inclined to the axis of the shaft, that essentially only the cutting edges at their foremost free end with the Drill hole wall come into engagement.
  • the above central carbide pin works like a centering element, however, this known rotary impact twist drill in Operation due to insufficient lateral guidance in the borehole. It can it may happen that the location hole is too large or the drilling tool even tilted in the location hole.
  • By the opposite of the axis of the shaft inclined arrangement of the peripheral carbide pins do not act on all sides edged carbide pins have relatively high radial forces that lead to loosening and The peripheral hard metal pins can fall out.
  • EP-A-0 226 537 which forms the generic generic term, is a rotary impact twist drill proposed the one over the entire diameter of the Has drill shaft extending carbide cutting plate, which in a continuous groove is inserted in the end face of the shaft.
  • the Cutting plate In addition to the Cutting plate are provided cutting pins that come from the end face of the shaft end Stick out of the shaft or from the jacket of the shaft.
  • the free ends of the Cutting pins are in the spanned by the cutting edges of the hard metal plate Surface of revolution.
  • the free ends of the shaft protruding from the jacket of the shaft When drilling, cutting pins come into contact with the wall of the borehole and roughen it during the drilling process. While in this known rotary impact twist drill there is already some guidance of the drilling tool in the hole the predominantly abrasive effect of the abutting against the borehole wall Cutting pins are given a certain stiffness, which is the achievable Mining capacity in the underground reduced.
  • the object of the present invention is therefore a rotary impact twist drill to improve in such a way that an optimal guidance of the drilling tool in the Location hole is guaranteed.
  • a rotary impact twist drill is to be created be, which is easy to operate, has no tendency to tilt and one high mining performance allowed.
  • the rotary impact twist drill according to the invention is intended moreover, be simple and inexpensive to manufacture.
  • a rotary impact twist drill which the in characterizing section of claim 1 has features.
  • at least one pin-shaped is in the area of the shaft end Guide element embedded in the shaft, its longitudinal axis essentially runs perpendicular to the longitudinal axis of the shaft.
  • the free end face of the pen-shaped Guide element has a protrusion compared to the sheath of the shaft, the is smaller than the radial projection of the insert with the hard metal cutting edges.
  • the protrusion of the insert will be an excellent guide for the drilling tool achieved in the borehole without the disadvantage of a certain stiffness as a result of having to put up with an abrasive effect. This makes the prerequisites for given a high drilling performance.
  • the pin-shaped guide element does not accept Part of the dismantling process, it has only management functions. This can do that Guide element without having to consider a cutting edge geometry, be very robust. By placing the pin-shaped guide element over its is embedded in the entire circumference, there is an optimal hold in the shaft.
  • two or more are pin-shaped Guide elements are provided, each in pairs in diagonally opposite Quadrants of a cross section are arranged perpendicular to the axis of the shaft.
  • the arranged in pairs for reasons of symmetry. This way sufficient scope for the arrangement of the extraction grooves for the drilling dust.
  • a carbide cutting insert which fits into a groove in the end face of the Shaft end is used, can be in the space between the pin-shaped Guiding elements and the cutting plate a Abfuhmut be provided.
  • the arrangement of the pin-shaped guide elements can be varied standing space can be varied, so that wider Hauptffuhmuten are provided can, which are upstream of the main cutting edges on the cutting plate. in the Area between a pin-shaped guide element and that in the direction of rotation the subsequent part of the cutting plate can also have a narrower performance be provided.
  • the pin-shaped guide elements are advantageously diagonal to one another arranged opposite one another, their longitudinal axes lying on one diameter.
  • the angle at which the pin-shaped guide elements are radial protruding insert on the circumference of the jacket are offset, depending on Needs vary.
  • An acute angle is advantageously chosen such that one wide main output in the direction of rotation of the drilling tool of a main cutting edge is upstream.
  • the pin-shaped guide elements preferably at a distance from the end face of the stem embedded in the sheath, which is about 1/4 to about 3/4 of the embedded Length of the carbide cutting edges is.
  • the distance relates to the location of the Longitudinal axes of the guide elements. In this way, the Drilling tool in the exact area due to the cutting attack the hard metal cutting on the borehole wall the greatest stress is subject.
  • the guide pins can be equidistant from the end face of the shaft or embedded at different intervals in the shaft.
  • the pin-shaped guide elements compared to the jacket Have a projection that is at least half the radial projection of the Carbide cutting corresponds. In the case of pebble hits, this tends to be the insert to avoid supporting end of the shaft to the side.
  • the pen-shaped ones work Management elements counter. The extent of the protrusion of the pen-shaped Guide elements thus defines the maximum distance that the free front end of the Dodge shaft. In this way, the greatest possible concentricity guaranteed without the pin-shaped guide elements permanently engaging with the borehole wall.
  • the free end face of the pin-shaped from the jacket of the shaft Guide elements is at least partially curved, the abrasive Effect of the guide elements in contact with the borehole wall clearly reduced.
  • the free end face preferably has that at least in regions Curvature of a spherical surface or a cylindrical surface, the curvature is matched to that of the sheath of the shaft.
  • the pin-shaped guide elements are circular Have cross-section.
  • the mounting holes in the shaft can be very easily with circular cross section can be created.
  • a depth stop on the guide elements as an assembly aid. This can for example by one or more on the jacket of the guide elements arranged guide pins can be realized.
  • the pin-shaped guide elements can be pointed have an enlarged head that bears against the jacket of the shaft during assembly and towering over it to the extent desired.
  • the guide elements are in one through groove embedded in the shaft end, which extends over a diameter of the Shaft extends. This further facilitates the manufacture of the tool. It there is no need to drill holes with a more or less precisely defined depth.
  • the guide elements is in addition to the groove for the Insert another groove milled into the shaft end, which in the desired Angle to the receiving groove for the insert is inclined.
  • This groove can be is a continuous groove, but grooves can also be milled in do not lie on a common diameter.
  • the fixation of the guide elements in the groove can be done, for example, by soldering.
  • FIGS. 1 and 2 of the inventive Rotary impact twist drill comprises a shaft 1 which is provided with two main discharge grooves 4, 5 is equipped for cuttings that run in a spiral shape in its casing 2.
  • a cutting plate 6 is arranged, which with Carbide cutting 7 is equipped.
  • the preferably roof-shaped Tungsten carbide blades 7 extend axially recessed from a blade tip 8 outside to the jacket 2 of the shank 1.
  • the insert is 6 in a groove 9 in the front end 3 of the shaft 1 fixed, which extends over its diameter.
  • the guide elements 11 are embedded in the shaft 1 such that their longitudinal axes L essentially run perpendicular to the longitudinal axis A of the shaft 1.
  • the rotary impact twist drill can have two guide elements 11 exhibit. However, only a single guide element 11 can also be provided, as indicated in the side view of the rotary impact twist drill in Fig. 1. at the arrangement of more than one guide element 11 in the shaft end 10, as shown in Fig. 2, preferably in pairs in diagonally opposite Quadrants of a cross section perpendicular to the longitudinal axis A of the shaft 1 intended. As shown, the longitudinal axes L of the guide elements 11 are arranged on a diameter of the shaft 1. However, this arrangement is not absolutely necessary.
  • the guide elements 11 can also be in the shaft end 10 in this way be embedded that their longitudinal axes in the cross-sectional plane of the shaft 1 straight lines deviating from a diameter, which are parallel or inclined to can run a diameter.
  • the guide elements 11 are embedded in the shaft 1 such that their longitudinal axis has a distance from the front end 3 of the shaft 1 which is approximately 1/4 to is about 3/4 of the embedded length of the cutting plate 6. As can be seen from Fig. 2, are the guide elements 11 over about 3/5 to about 3/4 of their longitudinal extent l in the Shaft 1 embedded.
  • guide elements 11 have a circular cross section. This is but not absolutely necessary, the guide elements 11 can also be one have polygonal cross-section, for example be hexagonal or octagonal.
  • the guide element 11 shown in Fig. 3 has two identically designed End faces 12 to enable the guide element to also be rotated through 180 ° can be embedded in the shaft 1.
  • the end face 12 of the in FIGS. 1 and 3 shown guide element 11 is in its curvature to the curvature of the jacket 2 of the shaft 1 adjusted.
  • the end face 12 initially has one annular portion 14 of a spherical surface on the cylindrical part 13 of the Connects guide element 11.
  • the radius of curvature corresponds to the spherical surface essentially the radius of curvature of the jacket 2 at the shaft end 10.
  • the of the central area 15 of the end face 12 which is enclosed in the annular area 14 for example the curvature of a cylindrical surface; but he could also be trained.
  • the guide element 21 shown in Fig. 4 is with a depth stop as Installation aid equipped.
  • the Depth stop formed by an annular shoulder 24, which on the cylindrical Section 23 of the guide element connects.
  • the free end face 12 of the Guide element 21 is provided on a mushroom-shaped head 22, which the cylindrical region 23 of the guide element 21 protrudes.
  • the radius of curvature of the Free end face 12 is the radius of curvature of the jacket 2 at the shaft end 10 equalized.
  • the end face 12 can consist of different surface sections be composed, as explained using the exemplary embodiment in FIG. 3.
  • the Free end face 12 of the guide element 21 can, however, as shown in FIG. 4, be formed by a spherical surface section with a suitable radius of curvature.
  • the guide elements 11 inserted in bores vertically to the shaft axis A and over their entire circumference in embedded the shaft 1.
  • 4 and 5 is an alternative embodiment of the Shown rotary twist drill according to the invention, in which the Guide elements 31 are embedded in a groove 16 in the front end 3 of the shaft.
  • the guide elements 31 are fixed in the groove 16 which is open at the end 3 for example by soldering.
  • the additional groove 16 can, as shown, as continuous groove can be formed, which extends over a diameter D of the shaft 1st extends and preferably at an acute angle with respect to the receiving groove 9 is inclined for the cutting plate 6.
  • any Guide element separate grooves may be provided on a not with a Diameter D are coinciding lines, which are parallel or inclined runs a diameter D and opens only at one point of the jacket 2.
  • the depth the additional groove (s) 16 is dimensioned such that the longitudinal axes L of the Guide elements 31 have a distance from the end face 3 of the shaft 1 which is about 1/4 to about 3/4 of the embedded length of the cutting plate 6.
  • At least one pin-shaped on the rotary impact twist drill according to the invention Guide element is provided, whose protrusion relative to the jacket of the Shank is smaller than the radial protrusion of the insert, becomes a excellent guidance of the drilling tool achieved in the borehole without the disadvantage a certain stiffness due to an abrasive effect have to. This creates the prerequisites for high drilling performance.
  • the pin-shaped guide element does not participate in the dismantling process, it has only Leadership functions and can therefore, regardless of a cutting geometry have to be trained to be very robust.
  • the essentially vertical Alignment of its longitudinal axis to the axis of the shaft facilitates the manufacture of the inventive rotary impact twist drill.

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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)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (10)

  1. Foret helicoïdal rotopercutant comprenant une tige (1) qui comporte, pour les débris de forage, au moins une gorge d'évacuation principale (4, 5) s'étendant de préférence en spirale dans sa surface périphérique et qui comprend, à l'une de ses extrémités de tige (10), une plaquette de coupe (6) avec des taillants en métal dur (7) qui dépassent axialement de la face frontale (3) de l'extrémité de tige (10) et radialement de la surface périphérique (2) de la tige (1), dans la zone de l'extrémité de tige (10) étant encastré, dans la tige (1), au moins un élément de guidage en forme de broche (11 ; 21 ; 31) dont l'axe longitudinal (L) s'étend sensiblement perpendiculairement à l'axe longitudinal (A) de la tige (1) et qui possède une face frontale libre (12), caractérisé en ce que la face frontale (12) présente, par rapport à la surface périphérique (2) de la tige (1), un débordement radial (r) qui est inférieur au débordement radial (s) de la plaquette de coupe (6).
  2. Dispositif selon la revendication 1, caractérisé en ce qu'il est prévu plus d'un element de guidage en forme de broche (11 ; 21 ; 31), les éléments de guidage (11 ; 21; 31) étant disposés à chaque fois par paire dans des quadrants opposés en diagonale d'une section transversale, perpendiculairement à l'axe (A) de la tige (1).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les éléments de guidage en forme de broches (11; 21; 31) sont disposés par paire en étant opposés en diagonale, leurs axes longitudinaux (L) se trouvant de préférence sur un diamètre de la tige (1).
  4. Dispositif selon une des revendications précédentes, caractérisé en ce que les éléments de guidage en forme de broches (11; 21 ; 31) sont encastrés dans la tige (1), de façon que la distance de leur axe longitudinal (L) à la face frontale (3) de la tige (L) soit égale à environ 1/4 à environ 3/4 de la longueur encastrée de la plaquette de coupe (6).
  5. Dispositif selon une des revendications précédentes, caractérisé en ce que le débordement radial (r) des éléments de guidage en forme de broches (11; 21; 31) par rapport à la surface périphérique (2) de la tige (1) correspond au moins à la moitié du débordement radial (s) de la plaquette de coupe (6).
  6. Dispositif selon une des revendications précédentes, caractérisé en ce que les faces frontales libres (12) des éléments de guidage en forme de broches (11; 21 ; 31) sont de configuration au moins partiellement courbe et font de préférence partie d'une surface sphérique ou d'une surface cylindrique, la courbure étant adaptée à celle de la surface périphérique (2) de la tige (1).
  7. Dispositif selon une des revendications précédentes, caractérisé en ce que les éléments de guidage (11; 21 ; 31) présentent une section circulaire et possèdent des faces frontales de configuration symétrique (12).
  8. Dispositif selon une des revendications 1 à 6, caractérisé en ce que les éléments de guidage en forme de broches (21) comportent une butée de profondeur servant d'aide à la pose, de préférence une tête élargie en forme de champignon (22) qui dépasse de la surface périphérique (2) de la tige (1).
  9. Dispositif selon une des revendications précédentes, caractérisé en ce que les éléments de guidage en forme de broches (11 ; 21; 31) sont disposés dans des rainures supplémentaires (16) qui sont ménagées dans l'extrémité de tige (10) et qui se trouvent de préférence sur un diamètre (D) de la tige (1).
  10. Dispositif selon une des revendications précédentes, caractérisé en ce que 3/5 à 3/4 de l'extension longitudinale des éléments de guidage en forme de broches (11 ; 21 ; 31) sont encastrés dans la tige (1).
EP96810629A 1995-12-07 1996-09-25 Perceuse rotative hélicoidale à percussion Expired - Lifetime EP0778390B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545646 1995-12-07
DE19545646A DE19545646A1 (de) 1995-12-07 1995-12-07 Drehschlag-Wendelbohrer

Publications (3)

Publication Number Publication Date
EP0778390A2 EP0778390A2 (fr) 1997-06-11
EP0778390A3 EP0778390A3 (fr) 1998-07-01
EP0778390B1 true EP0778390B1 (fr) 2003-10-01

Family

ID=7779437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810629A Expired - Lifetime EP0778390B1 (fr) 1995-12-07 1996-09-25 Perceuse rotative hélicoidale à percussion

Country Status (6)

Country Link
US (1) US5836408A (fr)
EP (1) EP0778390B1 (fr)
JP (1) JP3907756B2 (fr)
CN (1) CN1079045C (fr)
DE (2) DE19545646A1 (fr)
DK (1) DK0778390T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004016087A1 (de) * 2004-04-01 2005-10-20 Hilti Ag Bohrwerkzeug
SE533277C2 (sv) * 2008-12-19 2010-08-10 Sandvik Intellectual Property Borrkropp samt stödlist härför
EP2682212B1 (fr) * 2011-02-28 2020-10-07 Tungaloy Corporation Patin de guidage et outil de coupe
CN103402678A (zh) * 2011-02-28 2013-11-20 株式会社钨钛合金 引导块、切削工具本体及切削工具
CN102635309B (zh) * 2012-04-19 2017-10-17 平阳县鹏伟机械有限责任公司 一种冲击钻机的锤头
CN105750596B (zh) * 2015-12-08 2018-06-05 博世电动工具（中国）有限公司 钻头

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776819A (en) * 1953-10-09 1957-01-08 Philip B Brown Rock drill bit
US3858671A (en) * 1973-04-23 1975-01-07 Kennametal Inc Excavating tool
DE3544433C2 (de) * 1985-12-16 1995-12-14 Hilti Ag Gesteinsbohrer
DE3740692A1 (de) * 1987-09-18 1989-04-06 Hawera Probst Kg Hartmetall Gesteinsbohrer
DE3919095A1 (de) * 1988-07-16 1990-01-18 Hawera Probst Kg Hartmetall Bohrwerkzeug
DE3825107C2 (de) * 1988-07-23 1996-07-11 Hilti Ag Gesteinsbohrer mit Schneidplatte
DE4011441A1 (de) * 1990-04-09 1991-10-10 Hilti Ag Gesteinsbohrer
US5265688A (en) * 1990-04-09 1993-11-30 Hilti Aktiengesellschaft Rock drill

Also Published As

Publication number Publication date
EP0778390A2 (fr) 1997-06-11
JP3907756B2 (ja) 2007-04-18
US5836408A (en) 1998-11-17
CN1159382A (zh) 1997-09-17
CN1079045C (zh) 2002-02-13
DE59610747D1 (de) 2003-11-06
DK0778390T3 (da) 2004-02-09
JPH09177466A (ja) 1997-07-08
EP0778390A3 (fr) 1998-07-01
DE19545646A1 (de) 1997-06-12

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