EP0778100B1 - Foret héliocoidal de percussion - Google Patents

Foret héliocoidal de percussion Download PDF

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Publication number
EP0778100B1
EP0778100B1 EP96810630A EP96810630A EP0778100B1 EP 0778100 B1 EP0778100 B1 EP 0778100B1 EP 96810630 A EP96810630 A EP 96810630A EP 96810630 A EP96810630 A EP 96810630A EP 0778100 B1 EP0778100 B1 EP 0778100B1
Authority
EP
European Patent Office
Prior art keywords
shaft
cutting
reinforcement
central
end surface
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
EP96810630A
Other languages
German (de)
English (en)
Other versions
EP0778100A1 (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 EP0778100A1 publication Critical patent/EP0778100A1/fr
Application granted granted Critical
Publication of EP0778100B1 publication Critical patent/EP0778100B1/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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/905—Having stepped cutting edges
    • Y10T408/906—Axially spaced
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/905—Having stepped cutting edges
    • Y10T408/906—Axially spaced
    • Y10T408/9065—Axially spaced with central lead
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the invention relates to a rotary impact twist drill according to the generic Preamble of claim 1 (see US-A-34 47 616).
  • 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 of the generic type is, for example, from the EP-A-0 322 565 known. It comprises a shaft which has at least one discharge groove has its jacket, which spirally from the shaft end towards the insertion end of the tool. At the end of the shaft there is a groove in the end face of the shaft provided, which extends over a diameter of the shaft and continuously runs. A cutting tip with at least one hard metal cutting edge is with his Foot part inserted into the groove and fixed there. For example, the cutting tip is in the shaft end soldered.
  • the cutting tip is chamfered with a central tip and towards the roof Periphery axially recessed areas and carries carbide blades, which in the Operation remove material.
  • the material is removed by two mechanisms.
  • the raised central tip of the rotary impact twist drill through the Axial impact struck into the ground like a chisel.
  • the rotating movement of the tool causes the material to snap off and shear off.
  • the drill bit is from the borehole via the at least one main production groove in the shaft transported away. Due to the cutting edge geometry, one occurs during operation particularly high stress on the central tip of the cutting tip. Especially when drilling when the peripheral areas of the cutting tip the entire energy of the Axial strokes can be absorbed by the central tip.
  • the tips of the known rotary impact twist drills are often premature worn.
  • the drilling tool becomes blunt, which results in unfavorable tapping, and Centering characteristics; in addition, the drilling performance often drops after a short time strongly after.
  • the excessive stress on the Tip of the cutting tip especially when tapping to break the Edging of the cutting tip in the shaft end or preferably made of hard metal existing cutting plate itself.
  • Another disadvantage of the known Rotary impact twist drill is a relatively large effort must be operated in order to insert the cutting tip exactly in the continuous groove Position the shaft end. It must be exactly centered, its protrusion on both sides of the The sheath of the shaft must be exactly the same in order to ensure an even concentricity ensure and avoid jamming of the drilling tool in the hole.
  • a rotary impact twist drill is to be created which can also be used in conjunction with drilling rigs for larger diameters medium and low power.
  • the reaction forces that occur during operation should be kept small so that the speed of mining is improved.
  • the Risk of uncontrolled breaking of the cutting tip as a result of excessive Shear stress should be avoided.
  • the drilling tool should also be economically producible with large diameters.
  • the cutting tip is segmented and includes a central cutting edge and two peripheral segments that are thin Crosspieces are connected to each other.
  • the strength of the connecting bars is less than the thickness of the central cutting edge or the segments.
  • the central cutting edge rises above the reinforcement of the base part of the cutting tip and towers above it peripheral segments.
  • the peripheral segments are at a distance from the Central cutting edge, which is greater than the length of the connecting webs, preferably greater than the thickness of the cutting tip, and less than half Envelope diameter of the central cutting edge.
  • This variant of the The rotary impact twist drill according to the invention is particularly useful for drilling tools large diameter of particular advantage.
  • the subdivision of the cutting tip, which is preferably made of hard metal, into segments connected by thin webs has the advantage that in the manufacture of the Rotary impact twist drill expensive and relatively difficult to machine carbide can be saved. However, there is still an installation contiguous cutting tip in front, soft one-piece and form-fitting in the continuous groove in the end face of the shaft end can be used.
  • Another advantage of the thin webs connecting the central cutting edge and the peripheral segments consists in the fact that in the case of excessive shear stress, in particular the peripheral segments, act as predetermined breaking points. The cutting tip thus breaks not in an uncontrolled manner in the area of cutting-bearing segments, but only in a targeted manner at the connecting webs of the segments after fixing the cutting tip no longer perform a supporting or holding function in the groove in the shaft end. Even the rotary impact twist drill designed according to the invention remains with broken webs fully operational.
  • the longitudinal extension of the central cutting edge is at least the same, preferably larger than the largest cross-sectional diameter the thickening.
  • the central area of the base of the cutting tip is two has symmetrically arranged, essentially part-circular thickenings, which in correspondingly trained, symmetrical on both sides of the longitudinal extension of the through groove provided recesses are held by positive locking.
  • the symmetrical arrangement of the recesses facilitates the manufacture of the Recesses. Due to the symmetrical design of its foot section, this can Cutting tip also in a 180 ° rotated position in the recess be used, what the manufacture of the rotary impact twist drill overall further relieved.
  • the invention is the reinforcement in the axial direction of the shaft in essentially cylindrical.
  • the central recess simply created through a cylindrical bore that is before, at the same time or immediately after milling the groove in the end face of the shaft end is attached.
  • the reinforcement can also be essentially conical in the axial direction of the shaft be formed, the tip of the cone facing the hard metal cutting edge and is embedded in the shaft.
  • the conical bore in the shaft end can for example, similar to a countersink, but it can also be made in a forming process, for example in an embossing process.
  • the maximum is Cross-section of the reinforcement about 1.2 times to about 2 times, preferably about 1.5 times the thickness of the hard metal Cutting tip. This ensures that the cutting tip also in the area of the reinforcement circular in cross section on all sides of a sufficient strong material layer of the shaft is surrounded, so that no failure of the Shaft material can be made in the border area.
  • this is the Tungsten carbide cutting end of the shaft with guide elements equipped, which are fixed in the forehead or in the jacket of the shaft and the jacket protrude from the shaft.
  • the protrusion of the guide elements is the same or preferably less than the protrusion of the cutting tip. Because of their lesser The guide elements practically do not overhang to crush the The subsurface at and are practically not stressed by the axial shocks. As a result, they can fully perform their role as management elements be optimized.
  • the circumferential contour of the guide elements Contour of the shaft jacket largely adapted.
  • the axial Boundary surface of the guide elements a cylindrical surface, the radius of curvature adjusted to the radius of curvature of the jacket of the shaft.
  • rotary impact twist drill prepared according to the invention are those connected to the central cutting edge via connecting webs peripheral segments opposite embedded in the end face of the shaft Axial and radial recesses of the additional outer blades. To this In this way, they serve as guide elements, while the machining tasks of peripheral areas up to the borehole wall are taken over by the additional cutting edges will. At least one of the additional cutting edges is a main task assigned.
  • the advantage of this embodiment variant of the invention is that the Main load of the cutting tip essentially only in one transmission the axial runout lies and it can be optimized for this load, without having to consider the peripheral areas of the cutting tip.
  • the one-piece cutting tip can therefore be made very robust, while the additional cutting edges regardless of their cutting Task regarding their strength, the cutting edges and angles in a known manner Can be optimized. It is due to the lack of space for the removal of the drilling dust It is an advantage if, in addition to the cutting tip at the shaft end provided guide elements or additional cutting at an acute angle through groove for the cutting tip are arranged.
  • the Additional cutting edges lie on one diameter, but they can also be perfect be arranged asymmetrically. This will free space between you Guide element or an additional cutting edge and the leading in the circumferential direction peripheral section of the cutting tip enlarged and can be used for a larger one Dimensioning of the Hauptffuhmuten be used for the drilling dust. in the remaining narrower area between a guide element or a Additional cutting edge and the peripheral section trailing in the circumferential direction Cutting platelets can additionally be arranged for the drilling dust be.
  • the cutting tip consists of impact-resistant Material and the additional blades are made of a harder material than that Cutting tip.
  • the reinforced central cutting edge and the Additional cutting edges can be selected and selected exactly according to their loads and tasks Tungsten carbide materials are molded that are particularly suitable for each Are intended.
  • the simple version remains in this embodiment of the invention Mountability of the cutting tip and the additional cutting edges preserved.
  • the shaft only needs to be provided with a continuous groove in the central area has at least one part-circular recess.
  • the cuts for the Secondary cuts can be created in the same operation, for example.
  • 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, the Carbide cutting 7 is equipped.
  • the cutting tip 6 is fixed in a groove 9, which extends over the diameter of the shaft 1.
  • the shape of a substantially part-circular Bulge 12 has on the lateral longitudinal contour of the cutting tip 6.
  • the illustrated embodiment has the cutting tip 6 aside Longitudinal extension each such a bulge 12, which are symmetrical to each other opposite.
  • the continuous groove 9 in the end 3 of the shaft 1 has correspondingly shaped recesses 13 which are on both sides of the longitudinal extent of the Groove 9 are provided in the central region of the cross section of the shaft 1.
  • This in the groove 9 inserted cutting plate 6 is by positive locking its bulges 12 in the central region 11 of its foot part 10 in the recesses 13 of the through groove 9 held against radial displacement.
  • the axial fixation of the Cutting plate 6 is carried out in a manner known per se, for example by Solder in the groove 9.
  • the maximum cross section of the foot part 10 in the area of Gain is about 1.2 times to about 2 times, preferably about that 1.5 times the thickness of the cutting tip 6.
  • the gain of the central Region 11 of the foot part 10 two symmetrically arranged bulges 12 includes, it is understood that the bulges on both sides of the longitudinal extent of the Cutting plate 6 can also be arranged axially offset from one another. It can also only a single, substantially part-circular bulge 12 on one Side of the longitudinal extension of the cutting plate 6 may be provided.
  • the continuous groove 9, which is provided in the end 3 of the shaft 1 and over extends its diameter is in each case corresponding to the arrangement of the Bulges 12 are provided with one or more recesses 13.
  • FIG. 3 and 4 show a variant of a cutting tip 16 with the invention trained reinforcement of the central region 11 of its foot part 10.
  • Die Reinforcement of the foot part 10 which, when the cutting tip 16 is inserted, into the shaft 1 embedded, can be designed in different ways.
  • the reinforcement can be cylindrical in the axial direction.
  • the reinforcement can also be essentially conical in the axial direction.
  • the reinforcement can be located in a point 20 opposite the hard metal cutting edge Tapered tip, but it can also have the shape of a truncated cone exhibit.
  • FIGS. 1 and 2 While in the example shown in FIGS. 1 and 2, one Rotary impact twist drill the cutting plate 6 is formed continuously and two continuous, axially falling back from a cutting tip 8, roof-shaped beveled hard metal cutting 7 carries, is that shown in Figs. 3 and 4 Cutting tip 16 segmented. In particular, this includes Cutting tip 16 a central cutting edge 17 and two peripheral segments 18, which over thin connecting webs 19 are interconnected. The strength of the Connecting webs 19 is less than the thickness of the central cutting edge 17 or peripheral segments 18.
  • the central cutting edge 17 is similar to the hard metal cutting edges 7 on the continuous one Cutting plate 6 shown in FIGS. 1 and 2.
  • Away from the tip 20 extend two roof-shaped hard metal cutting edges 21, which in Direction of the connecting webs 19 run axially recessed.
  • the top 20 of the Central cutting edge 17 projects beyond on both sides in the direction of the casing 2 of the shaft 1 adjoining peripheral segments 18 axially.
  • the distance a at which the peripheral Segments 18 are arranged by the central cutting edge 17 is greater than the length b the connecting webs 19.
  • the distance a is greater than the thickness of the cutting tip 16 in the area outside of Thickening and smaller than half the enveloping circle diameter h of the central cutting edge 17.
  • the longitudinal extent of the central cutting edge 17 is at least the same, preferably larger, than the largest cross-sectional diameter of the foot part 10 in the area of the thickening.
  • guide elements are as Pins 22 formed, which are fixed in the jacket 2 of the shaft 1 and protrude beyond it.
  • the protrusion of the guide pins 22 over the jacket 2 of the shaft less than the protrusion of the cutting tip 6.
  • the enveloping circle of the cutting tip 6 is In Fig. 2 indicated by the dashed line h.
  • the contour of the guide surface 23 of the Guide pins 22 are adapted to the contour of the jacket 2 of the shaft 1.
  • the guide pins 22 from the jacket 2 of the Projecting shaft 1 they can also be embedded in the stimulating end 3 of the shaft and for example, by suitable inclination of the pins 22, the shaft radially and axially tower over. It can also be provided that the guide pins 22 in the circumferential area of the shaft 1 to embed that part of the outer contour of the guide pins 22 Overhanging coat. Instead of guide pins 22 with a circular cross section those with a polygonal cross section may also be provided.
  • the leadership elements can also be of lamellar shape and the shape of minor cutting edges exhibit.
  • FIG. 5 is a variant of a rotary impact twist drill shown in which a segmented cutting tip 16 with reinforcement in its Foot part 10 inserted into a groove 9 with symmetrically arranged recesses 12 is.
  • the cutting tip 16 is, for example, one according to FIGS 3 and 4.
  • additional cutting edges 26 in the end 3 of the shaft 1 embedded.
  • the additional cutting edges 26 protrude beyond the peripheral segments 18 axially and radially and define the envelope circle h. This will take the peripheral Segments 18 are still only management functions, while the cutting function to the Additional cutting 26 passes. Since the actual material-removing function of the Additional cutting edges 26 are perceived, the main discharge grooves 4, 5 are such arranged that they are upstream of the additional cutting edges 26 in the direction of rotation R.
  • the additional cutting edges 26 in the direction of peripheral segments 18 are shifted. In this way they close with the Cutting tip 16 an acute angle.
  • the additional cutting edges 26 can, as in Fig. 5 shown opposite to each other on a diameter, but they can also be arranged differently. Also, instead of a pair of Additional cutting edges 26 only a single additional cutting edge can be provided, the one Main discharge groove is assigned.
  • the peripheral segments 18 meet the embodiment shown mere management function.
  • Secondary discharge groove 24, 25 may be provided, which along the axial extension of the Shank 1 open into the main discharge grooves 4, 5.
  • Additional cutting 26 take over the actual material-removing functions it is advantageous if the cutting plate 6 or 16 made of an impact-resistant material consists.
  • the additional cutting edges 26 are made of a harder and more abrasive material than the cutting tip 6 or 16.

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

Claims (9)

  1. Foret hélicoïdal roto-percutant comportant une tige (1), qui présente au moins une rainure d'évacuation principale (4, 5), s'étendant en spirale dans son enveloppe (2), pour le menu de forage, et au moins une lame en métal dur (7 ; 21), qui est formée sur une plaquette de coupe (6 ; 16) d'une seule pièce, dont la partie de pied (10) est fixée essentiellement dans une rainure (9) continue, s'étendant sur le diamètre de la tige (1), dans une extrémité frontale (3) de la tige (1) et qui est renforcée dans la zone de son diamètre, de préférence dans la zone centrale (11) de son extension longitudinale, de manière que sa section transversale présente au moins un renflement (12) sensiblement en forme de cercle partiel, et la rainure (9) continue présente, dans l'extrémité frontale (3) de la tige (1), un évidement (13) formé en correspondance pour le renfort de la plaquette de coupe (6 ; 16), de sorte que la partie de pied (10) de la plaquette de coupe (6 ; 16) est centrée par complémentarité de forme, caractérisé en ce que la plaquette de coupe (16) est segmentée et comprend une lame centrale (17) et deux segments périphériques (18), qui sont reliés entre eux par de minces cloisons de liaison (19), dont l'épaisseur est inférieure à l'épaisseur de la lame centrale ou des segments, en ce que la lame centrale (17) se soulève au-dessus du renfort et dépasse les segments périphériques (18), et en ce que les segments périphériques (18) sont disposés à une distance (a) de la lame centrale (17), qui est supérieure à la longueur (b) des cloisons de liaison (19), de préférence supérieure à l'épaisseur de la plaquette de coupe (16), et inférieure à la moitié du diamètre du cercle d'enveloppe de la lame centrale (17).
  2. Dispositif selon la revendication, caractérisé en ce que l'extension longitudinale de la lame centrale (17) est au moins égale, de préférence supérieure, au plus grand diamètre de la section de la surépaisseur.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le renfort de la zone centrale (11) de la partie de pied (10) est symétrique par rapport à son extension longitudinale et en ce que des deux côtés de la rainure (9), dans l'extrémité frontale (3) de la tige (1), est prévu un renflement (13) correspondant, sensiblement en forme de cercle partiel.
  4. Dispositif selon la revendication 3, caractérisé en ce que le renfort dans la direction axiale de la tige (1) est sensiblement cylindrique.
  5. Dispositif selon la revendication 3, caractérisé en ce que le renfort de la direction axiale de la tige (1) est sensiblement conique, la pointe du cône faisant face à la lame en métal dur (7 ; 21) et étant noyée dans la tige (1).
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la section maximale du renfort représente environ 1,2 à environ 2 fois, de préférence environ 1,5 fois l'épaisseur de la plaquette de coupe (6, 16).
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'extrémité frontale (3) de la tige (1), portant la (les) lame(s) en métal dur (7 ; 21) est équipée d'éléments de guidage (22), qui sont fixés dans l'extrémité frontale (3) ou dans l'enveloppe (2) de la tige (1) et qui dépassent de l'enveloppe (2) de la tige (1), le débordement des éléments de guidage (22) étant égal ou de préférence inférieur au débordement de la plaque de coupe (6 ; 16) et le contour périphérique de la surface de guidage (23) des éléments de guidage (22) correspondant largement au contour de l'enveloppe de tige (2).
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les segments périphériques (8), reliés à la lame centrale (17) par des cloisons de liaison (19), sont en retrait axialement et radialement par rapport à des lames supplémentaires (26), noyées dans l'extrémité frontale de la tige (1), dépassant de l'enveloppe de tige (2), et servent d'éléments de guidage, et en ce qu'une rainure d'évacuation principale est associée à au moins l'une des lames supplémentaires (26).
  9. Dispositif selon la revendication 8, caractérisé en ce que la plaquette de coupe (6, 16) est en matériau résistant aux chocs et en ce que les lames supplémentaires (26) sont faites d'un matériau plus dur que la plaquette de coupe (6 ; 16).
EP96810630A 1995-12-07 1996-09-25 Foret héliocoidal de percussion Expired - Lifetime EP0778100B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545647 1995-12-07
DE19545647A DE19545647A1 (de) 1995-12-07 1995-12-07 Drehschlag-Wendelbohrer

Publications (2)

Publication Number Publication Date
EP0778100A1 EP0778100A1 (fr) 1997-06-11
EP0778100B1 true EP0778100B1 (fr) 1998-12-23

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EP96810630A Expired - Lifetime EP0778100B1 (fr) 1995-12-07 1996-09-25 Foret héliocoidal de percussion

Country Status (6)

Country Link
US (1) US5779403A (fr)
EP (1) EP0778100B1 (fr)
JP (1) JP3907757B2 (fr)
CN (1) CN1081117C (fr)
DE (2) DE19545647A1 (fr)
DK (1) DK0778100T3 (fr)

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CN102717127A (zh) * 2012-07-04 2012-10-10 邱立华 能够形成柱锥形孔的钻头
CN105312633A (zh) * 2014-08-04 2016-02-10 丹阳市博上工具有限公司 一种打孔钻
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DE59601040D1 (de) 1999-02-04
CN1081117C (zh) 2002-03-20
US5779403A (en) 1998-07-14
EP0778100A1 (fr) 1997-06-11
DK0778100T3 (da) 1999-08-23
JPH09177467A (ja) 1997-07-08
DE19545647A1 (de) 1997-06-12
JP3907757B2 (ja) 2007-04-18
CN1159383A (zh) 1997-09-17

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