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EP0156762B1 - Foret à couronne - Google Patents

Foret à couronne Download PDF

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Publication number
EP0156762B1
EP0156762B1 EP85810026A EP85810026A EP0156762B1 EP 0156762 B1 EP0156762 B1 EP 0156762B1 EP 85810026 A EP85810026 A EP 85810026A EP 85810026 A EP85810026 A EP 85810026A EP 0156762 B1 EP0156762 B1 EP 0156762B1
Authority
EP
European Patent Office
Prior art keywords
drilling
drill bit
support segments
hollow drill
segments
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
Application number
EP85810026A
Other languages
German (de)
English (en)
Other versions
EP0156762A1 (fr
Inventor
Karl-Heinz Ing. Gärtner
Franz Hoyss
Heinrich Pauli
Dieter Dipl.-Ing. Scholz
Horst-Detlef Ing. Gassmann
Ernst Wohlwend
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6229642&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0156762(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hilti AG filed Critical Hilti AG
Priority to AT85810026T priority Critical patent/ATE34329T1/de
Publication of EP0156762A1 publication Critical patent/EP0156762A1/fr
Application granted granted Critical
Publication of EP0156762B1 publication Critical patent/EP0156762B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • 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
    • E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type

Definitions

  • the invention relates to a hollow drill with a metallic, hollow cylindrical carrier body, which has an open end on the drilling direction side with supporting segments of the same design fastened in the circumferential direction at a spacing from one another with cutting teeth of diamond grain embedded therein, the supporting segments projecting beyond the end side of the carrier body on the drilling direction side.
  • Hollow drills are known for producing bores in rock, concrete and similar materials (AT-B-373196), which have a cylindrical carrier body with positively fastened supporting segments with cutting teeth made of diamond grain embedded therein.
  • the support segments of these known hollow drills consist of a matrix in which the diamond grains are embedded.
  • the free end face of these support segments is each designed as a plane plane running normal to the longitudinal axis of the hollow drill.
  • the supporting segments are produced by sintering, which means that there are no free-standing diamond grains on the surface.
  • the support segments produced in this way are therefore not suitable for the tapping process or for the actual drilling process due to the lack of free-standing diamond grains.
  • the invention has for its object to provide a hollow drill of the type mentioned, the support segments are economically producible and also ensure a perfect drilling process, which is particularly feasible without separate aids, such as additional holding by the operator.
  • the object is achieved in that the end region of the support segments on the drilling direction tapers at least over part of their length in the drilling direction and the free end face forms a line running in the circumferential direction along at least part of the tapered end region of the support segments.
  • the support segments with a tapered end region according to the invention are also preferably produced by sintering, this production also having the result that no diamond grains acting as cutting teeth are exposed on the surface.
  • the tapered end area of new support segments manufactured in this way comes into contact with the drilling material during the first tapping process, a part of the matrix is removed very quickly due to the extraordinarily high specific stress in the area of the free linear end face, so that a small number of diamond grains are removed in that area be exposed. Since these exposed diamond grains lie essentially on a line extending in the circumferential direction, they create a guideway immediately after hitting the drilling material. This guideway prevents the hollow drill bit from moving sideways and increases as the tapping process continues.
  • the entire surface of the supporting segments gradually comes into contact with the drill material, so that diamond grains are continuously exposed in those areas by removing the matrix.
  • the large number of exposed diamond grains can no longer lead to lateral evasion of the hollow drill thanks to the already existing sufficient guidance.
  • the tapered area of the support segments has fulfilled its task if a sufficient guideway for the cabbage borer preventing lateral deflection has been created.
  • the design of the support segments is therefore advantageously carried out in such a way that the tapered area is broken down when the remaining surface of the support segments has reached a condition suitable for the further drilling process. With such drilled-in support segments, both tapping and actual drilling operations can then be carried out without adverse effects.
  • the tapering end region of the support segments advantageously has one or several radially inclined side surfaces.
  • the side surfaces inclined in this way can extend over the entire length or only over part of the length of the support segments.
  • Such side surfaces inclined in the circumferential direction which lead to a shortening of the line running in the circumferential direction, can be arranged upstream, downstream or arranged on both sides in the direction of rotation of the hollow drill.
  • the speed of removal of the tapered end area can be influenced both by the dimensioning in terms of size and by the formal design.
  • the tapering end region of the support segments preferably has radially rectilinear side surfaces.
  • the tapering end region is preferably formed by an inclined side surface.
  • the side surface which is expediently inclined at an angle of 50 ° -80 °, preferably 70 °, to the drill axis can either extend towards the peripheral edge of the support segment in the drilling direction or decrease in the drilling direction.
  • the end region of the support segments on the drilling direction side is formed by two inclined side surfaces.
  • This embodiment ensures a favorable load due to the symmetrical design, since the forces act in the center. This occurs particularly with side surfaces that are preferably inclined at the same angle.
  • Such support segments lead to advantages in terms of strength and additionally result in a favorable load on the connection, for example produced by a soldering process, to the hollow cylindrical carrier body of the hollow drill.
  • the angle enclosed between the two side surfaces can be between 60 ° and 120 ° and preferably 90 °. This inclination of the side surfaces on the one hand fulfills the strength requirements for the support segments and on the other hand ensures that a sufficient number of diamond grains is uncovered quickly enough for drilling during the first contact between the support segments and the drilling material.
  • the improvement in the drilling behavior is achieved by the end face of the hollow drill, which is at least partially designed as a line.
  • the invention relates in particular to the further development of these supporting segments.
  • a taper of such supports can also be formed by one or more radially inclined side surfaces, wherein such side surfaces preferably also run in a straight line and can have the aforementioned angular mass.
  • FIG. 1 shows a hollow drill designated 1 overall. This consists of a hollow cylindrical carrier body 2 with a drive shaft 3 protruding counter to the drilling direction. Cutting teeth 6 formed by diamond grain are embedded in these.
  • the end region of the support segments 5 on the drilling direction side is tapered in the drilling direction, two side surfaces 7 running at an angle symmetry with respect to one another forming an angle a of 90 °.
  • the intersection of the side surfaces 7 forms a line 8 running in the circumferential direction, along which incisors 6 are exposed during the drilling process.
  • the support segments 5 are form-fitting on the support body 2 and fixed, for example, by soldering.
  • the cutting teeth 6 or 14 lying on the line 8 or 13 first create a guide groove which prevents the hollow drill 1 from evading radially from the start.
  • the tapered end region of the support segments 21 also has a circumferentially inclined boundary surface 24 which can be connected upstream or downstream of the direction of rotation of the hollow drill.
  • Cutting teeth 25 in the form of diamond grain are also embedded in the supporting segment 21.
  • FIG. 6 shows a support segment, designated overall by 31, which is arranged on a support body 2 and has two radially inclined side surfaces 32.
  • the radius r of the line 33 formed by the intersection of the side surfaces falls below the average radius R of the carrier body 2, the support segment 31 being arranged in such a way that the maximum dimension of the radius difference is at the segment ends.
  • boundary surfaces 34 are provided in order to avoid the radius difference which has a disadvantageous effect on the creation of a guide groove. These boundary surfaces 34 lead to a shortening of the line 33. The radius difference has thus been reduced in such a way that it can no longer have a disadvantageous effect when the guide groove is created.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Disintegrating Or Milling (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Drilling Tools (AREA)

Claims (9)

1. Foret à couronne avec un corps porteur (2) métallique, cylindrique creux, qui présente une extrémité ouverte du côté de la direction du forage, avec des segments porteurs (5, 11, 21, 31) de même conformation, fixés, avec adaptation des formes, à distance les uns des autres en direction périphérique, avec, enrobées en eux, des dents tranchantes à noyau de diamant, les segments porteurs dépassant la face frontale, en direction du forage, des corps porteurs (2), caractérisé en ce que la région d'extrémité, du côté de la direction du forage, des segments porteurs (5, 11, 21, 31), se rétrécit sur au moins une partie de leur longueur, dans la direction du forage et en ce que la face frontale libre forme, le long d'au moins une partie de la région d'extrémité rétrécie des segments porteurs, une ligne (8, 13, 23, 33) s'étendant en direction périphérique.
2. Foret à couronne suivant la revendication 1, caractérisé en ce que la région d'extrémité se rétrécissant en direction du forage des segments porteurs (5, 11, 21, 31) présente une ou plusieurs surfaces latérales (7, 12, 22, 32) inclinées radialement.
3. Foret à couronne suivant la revendication 2, caractérisé en ce que les surfaces latérales (7, 12, 22, 32) s'étendent en ligne droite.
4. Foret à couronne suivant l'une des revendications 1 à 3, caractérisé en ce que la région d'extrémité des corps porteurs (21, 31) se rétrécissant en direction du forage, présente une ou plusieurs surfaces limites (24, 34) inclinées en direction périphérique.
5. Foret à couronne suivant l'une des revendicàtions 1 à 4, caractérisé en ce que la région d'extrémité, se rétrécissant, des segments porteurs (11), est formée par une surface latérale (12) inclinée.
6. Foret à couronne suivant la revendication 5, caractérisé en ce que la surface latérale (12) est inclinée sur l'axe du foret sous un angle (β) de 50° à 80°.
7. Foret à couronne suivant l'une des revendications 1 à 4, caractérisé en ce que la région d'extrémité, du côté de la direction du forage, des segments porteurs (5, 21, 31) est formée par deux surfaces latérales inclinées (7, 22, 32).
8. Foret à couronne suivant la revendication 7, caractérisé en ce que les deux surfaces latérales (7, 22, 32) sont inclinées sous le même angle.
9. Foret à couronne suivant la revendication 7 ou 8, caractérisé en ce que l'angle (a) entre les deux surfaces latérales (7, 22, 32) est de 60° à 120°.
EP85810026A 1984-03-05 1985-01-25 Foret à couronne Expired EP0156762B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810026T ATE34329T1 (de) 1984-03-05 1985-01-25 Hohlbohrer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843408092 DE3408092A1 (de) 1984-03-05 1984-03-05 Hohlbohrer
DE3408092 1984-03-05

Publications (2)

Publication Number Publication Date
EP0156762A1 EP0156762A1 (fr) 1985-10-02
EP0156762B1 true EP0156762B1 (fr) 1988-05-18

Family

ID=6229642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810026A Expired EP0156762B1 (fr) 1984-03-05 1985-01-25 Foret à couronne

Country Status (3)

Country Link
EP (1) EP0156762B1 (fr)
AT (1) ATE34329T1 (fr)
DE (2) DE3408092A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857552A3 (fr) * 1997-01-27 2000-02-09 Tyrolit Schleifmittelwerke Swarovski KG Elément pour couper de la pierre ayant une résistance accrue à l'usure

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3603499A1 (de) * 1985-05-07 1986-11-13 Geißler & Kuper GmbH Diamantwerkzeug - Wiederaufbereitung, 3100 Celle Diamantbohrkrone mit schaftrohr und rohrgewindeanschluss
DE3533929A1 (de) * 1985-05-07 1986-11-13 Geißler & Kuper GmbH Diamantwerkzeug - Wiederaufbereitung, 3100 Celle Diamantbohrkrone mit schaftrohr und rohrgewindeanschluss
JPS62107909A (ja) * 1985-11-05 1987-05-19 Disco Abrasive Sys Ltd 二枚刃コアドリルの生産方法
DE8715431U1 (de) * 1986-12-10 1988-04-07 Fa. Herbert Happe, 5600 Wuppertal Bohrvorrichtung zum Ausschneiden von Ringschlitzen
DE3706641A1 (de) * 1987-03-02 1988-09-15 Hilti Ag Hohlbohrer
DE8805449U1 (de) * 1988-04-25 1988-06-09 Maier, Wolfgang, 5630 Remscheid Diamant-Kernbohrer
DE4226363C2 (de) * 1992-08-10 1995-07-06 Bauer Spezialtiefbau Bohrkrone mit umfangverteilten, lösbar angeordneten Zahnkörpern
DE19650480A1 (de) * 1996-12-05 1998-06-10 Ofra Struhalla Diamant-Werkzeug
US6203416B1 (en) * 1998-09-10 2001-03-20 Atock Co., Ltd. Outer-diameter blade, inner-diameter blade, core drill and processing machines using same ones
DE202004010916U1 (de) * 2004-07-12 2005-11-24 Diewe Diamantwerkzeuge Gmbh Bohrkrone und Bohrkronensegment
GB2423536A (en) * 2005-02-24 2006-08-30 Marcrist Internat Ltd Diamond core drill
GB2423538A (en) * 2005-02-24 2006-08-30 Marcrist Internat Ltd Core drilling segments with side protection
GB2423537A (en) * 2005-02-24 2006-08-30 Marcrist Internat Ltd Core drills
RU168413U1 (ru) * 2016-05-18 2017-02-02 Акционерная Компания "АЛРОСА" (публичное акционерное общество) (АК "АЛРОСА" (ПАО)) Буровая коронка
CN114728349A (zh) 2019-11-14 2022-07-08 米沃奇电动工具公司 具有大的硬质合金悬突的孔锯
CN114183079A (zh) * 2021-11-15 2022-03-15 河南黄河旋风股份有限公司 具备加水排渣功能的钻筒

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1583845A1 (de) * 1968-02-19 1970-09-24 Zentrales Reparatur Und Ausrue Bohrkrone fuer Tief-,Schuerf-,Untersuchungs- und anderweitige Bohrungen
US3537538A (en) * 1969-05-21 1970-11-03 Christensen Diamond Prod Co Impregnated diamond bit
BE874985A (fr) * 1979-03-21 1979-07-16 Diamant Boart Sa Couronne de sondage
US4267814A (en) * 1979-12-06 1981-05-19 Federal-Mogul Corporation Abrasive saw blade for trapezoidal grooving
AT373196B (de) * 1980-11-11 1983-12-27 Swarovski Tyrolit Schleif Hohlbohrer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857552A3 (fr) * 1997-01-27 2000-02-09 Tyrolit Schleifmittelwerke Swarovski KG Elément pour couper de la pierre ayant une résistance accrue à l'usure

Also Published As

Publication number Publication date
EP0156762A1 (fr) 1985-10-02
DE3562725D1 (en) 1988-06-23
ATE34329T1 (de) 1988-06-15
DE3408092A1 (de) 1985-09-19

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