EP0054721A1 - Trépan de forage particulièrement pour la pierre - Google Patents

Trépan de forage particulièrement pour la pierre Download PDF

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Publication number
EP0054721A1
EP0054721A1 EP19810109327 EP81109327A EP0054721A1 EP 0054721 A1 EP0054721 A1 EP 0054721A1 EP 19810109327 EP19810109327 EP 19810109327 EP 81109327 A EP81109327 A EP 81109327A EP 0054721 A1 EP0054721 A1 EP 0054721A1
Authority
EP
European Patent Office
Prior art keywords
drill
hollow
drill bit
bit
section
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.)
Ceased
Application number
EP19810109327
Other languages
German (de)
English (en)
Inventor
Wolfgang Dipl.-Ing. Peetz
Siegfried Klaissle
August Haussmann
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.)
Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
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 EP0054721A1 publication Critical patent/EP0054721A1/fr
Ceased 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
    • E21B10/02—Core bits
    • 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
    • E21B10/36—Percussion drill bits

Definitions

  • the invention relates to a drill, in particular a rock drill, according to the preamble of claim 1.
  • Drills of this type are provided as tools for rotary drilling on electric hand tools.
  • the inner bottom of the hollow core bit is usually flat and lies approximately perpendicular to the axis of the drill. With these drills, a significant part of the impact energy is converted into sound energy and is therefore lost to the work of the drill.
  • the invention is based on the knowledge that this phenomenon is essentially caused by the right-angled position of the crown bottom to the drill axis. The axially applied impact forces are only redirected to a small extent into the cylindrical wall of the hollow drill bit, so that the greatest proportion of the energy of the impact pulses on the bottom surface of the drill bit emerges unused as a sound wave.
  • the invention has for its object to design the generic drill so that the impact energy applied is better utilized and thus the effect degree of the drill equipped with the drill is improved.
  • a known rock drill of conventional design is shown for a better understanding of the invention.
  • This drill has a shank 2 and a hollow drill bit 1 with a flat bottom 3 which is perpendicular to the drill axis A.
  • the cutting ring of the hollow drill bit is formed by a hard metal cutting ring 5, but can also be fitted with hard metal teeth or be designed in another way for cutting.
  • the drill is clamped in a hand drill and used for rotary drilling.
  • the axially directed impact forces superimposed on the rotary movement of the drill act on the end face 4 of the drill shank 2. These impact impulses are transmitted via the drill shank 2 to the hollow drill bit 1 and from there into the cutting ring 5.
  • the arrows P and p1 symbolize the impinging impulses that are transmitted in the material of the drill.
  • a large part of the impact energy is not passed on into the cutting ring, but rather emerges in the area of the flat crown bottom 3 as a sound wave, which is symbolized by the arrows p2.
  • This part of the axially acting force is therefore lost for the impact machining, so that the drill has a low efficiency with regard to the impact performance.
  • the drill section 7a is hollow between the drill shaft and the cylindrical section 1a, so that the bottom 3a of the hollow drill bit is deepened and tapers downwards. It is thereby achieved that the impact pulses P are deflected in the transition region from the drill shaft 2a to the wall of the hollow drill bit in such a way that that the transmitted pulses p1 still contain the largest part of the impact energy. A significantly higher axial force therefore acts on the cutting ring 5a than in the known drill (FIG. 1).
  • the crown base 3a is inclined in the axial plane at an angle to the drill axis A and runs obliquely in the axial section in the direction of the cylindrical wall 8a of the hollow drill bit.
  • the crown base 3a is conical, the cone axis coinciding with the drill axis A.
  • the bottom 3a runs parallel to the conical outer lateral surface of the drill section 7a forming the transition region, so that the wall in the region of the conical bottom 3a has an approximately constant thickness.
  • the impact force acting on the end face 4a of the drill shaft 2a is deflected into the wall of the conical drill section 7a in the region of the cone tip, which is near the lower end 6a of the crown base 3a. Because of the inclined position of the crown base 3a, only a relatively small proportion of the impact energy is lost, while the major part reaches the cutting ring 5a via the section 7a and the subsequent hollow drill bit section formed by the cylindrical wall 8a. With this drill, an increase in the total percussion drilling performance of about 50% is achieved in comparison to the conventional design (FIG. 1).
  • the wall thickness of the conical section 7a is sufficiently large to be able to transmit the forces occurring during impact drilling without the risk of breakage.
  • the thickness of the wall need not be the same over the entire height of section 7a; it could, for example, also increase steadily in the direction of the drill shank.
  • the cone angle p of the crown base 3a should be less than approximately 130 °. In the case of a substantially larger cone angle, a large lever arm would act on the transition point to the shaft via the cylindrical hollow drill bit section 8a, so that, above all, the bending stress would be very great.
  • the Kegelwinkelß should therefore preferably be only about 60 ° to about 90 °.
  • the inner surfaces 9a and 9a 'and the outer surfaces 10a and 10a' of the two sections 8a and 7a adjoin one another directly, so that there are no projections or shoulders at the transition between them which could lead to cracking as a result of a notch effect and thus to a risk of breakage.
  • the two sections 7a and 8a have approximately the same wall thickness, which facilitates the manufacture of the drill.
  • the cylindrical section 8a has a greater length in the axial direction of the drill than the conical section 7a.
  • the crown base 3a is rounded at the deepest point 6a, so that there is no notch effect in this area either.
  • the diameter D of the drill shaft 2a is greater than the wall thickness d of the hollow drill bit, and the two dimensions are matched to one another so that the drill shaft 2a can absorb and transmit a high impact force and the hollow drill bit can safely absorb this force and the reaction forces.
  • a favorable ratio arises here if the wall thickness d is approximately a quarter to a third of the shaft diameter D.
  • the drill is formed in two parts.
  • the cylindrical section 8b is a separate part, which forms the hollow drill bit and is fastened to the conical section 7b, which in turn is formed in one piece with the drill shaft 2b.
  • the conical section 7b is thus a section of the drill shaft, but forms the bottom when the crown 8b is inserted.
  • This section 7b has a cylindrical collar 11, the outer lateral surface 12 of which merges into the conical lateral surface 10b 'of the drill section 7b.
  • the conical section 7b has on the inside a shoulder 13 which has a support surface 14 lying at right angles to the drill axis A and a fitting surface 15 for the drill bit 1b lying in the direction of the drill axis.
  • the cylindrical hollow drill bit 8b is supported in the axial direction on the support surface 14 and also lies with its outer lateral surface 10b on the mating surface 15 over the entire circumference.
  • the cylindrical wall 8b of the hollow drill bit is thereby securely supported in the axial and radial directions on the conical drill section 7b. It can be firmly connected to the section 7b by gluing, soldering or in a similar manner, but also releasably with screws or the like.
  • the height of the collar 11 measured in the direction of the drilling axis corresponds approximately to half the height of the cylindrical wall 8b of the hollow drill bit, which is therefore adequately secured in the radial direction. This also provides a relatively large mounting surface for the Bohr._krone 1b.
  • the width of the support surface 14 corresponds approximately to the wall thickness of the cylindrical wall 8b, which thereby rests completely on the support surface 14 with its inner end face, so that the impact pulses p1 are undisturbed and completely introduced into the hollow core bit and the reaction forces are absorbed via the support surface 14.
  • the conical crown base 3b directly adjoins the support surface 14. A smooth transition from the cylindrical inner surface 9b to the crown base 3b is thereby achieved. Since the support surface 14 of the shoulder 13 is closer to the cutting ring 5b than the transition point between the outer circumferential surfaces 12 and 10b of the conical section 7b, the cylindrical collar 11 has a wall thickness which is sufficient for the intended purpose but not too great, which saves material becomes.
  • the wall of the conical section 7b is thicker than when the drill is made in one piece (cf. FIG. 2). Its thickness d2 is approximately twice the wall thickness d1 of the cylindrical drill bit and approximately half the shank diameter D.
  • the lower end 6a and 6b of the crown base 3a and 3b lies in both versions approximately at the height of the upper shaft end; 3, the bottom end 6b is slightly higher than the plane defining the shaft end, which results in a higher strength.
  • the position of the lower bottom end 6a or 6b in the illustrated axial section results in a fork-like branching of the shaft into the conical section 7a or 7b and is essential for the largely lossless introduction of force from the shaft into the conical section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)
EP19810109327 1980-12-24 1981-10-30 Trépan de forage particulièrement pour la pierre Ceased EP0054721A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803049135 DE3049135A1 (de) 1980-12-24 1980-12-24 Bohrer, insbesondere gesteinsbohrer
DE3049135 1980-12-24

Publications (1)

Publication Number Publication Date
EP0054721A1 true EP0054721A1 (fr) 1982-06-30

Family

ID=6120355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810109327 Ceased EP0054721A1 (fr) 1980-12-24 1981-10-30 Trépan de forage particulièrement pour la pierre

Country Status (2)

Country Link
EP (1) EP0054721A1 (fr)
DE (1) DE3049135A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334806A1 (fr) * 1988-03-21 1989-09-27 HILTI Aktiengesellschaft Couronne de forage de roche
WO1989011580A1 (fr) * 1988-05-23 1989-11-30 Vsesojuzny Nauchno-Issledovatelsky Institut Transp Instrument pour perçage rotatif a percussion
US5004056A (en) * 1988-05-23 1991-04-02 Goikhman Yakov A Percussion-rotary drilling tool
CN104741667A (zh) * 2015-03-23 2015-07-01 深圳市圆梦精密技术研究院 套式孔加工钻头
CN112832796A (zh) * 2021-03-16 2021-05-25 中国铁建重工集团股份有限公司 Tbm刀盘、tbm及硬岩致裂tbm掘进方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8715431U1 (fr) * 1986-12-10 1988-04-07 Fa. Herbert Happe, 5600 Wuppertal, De
DE19507487A1 (de) * 1995-03-03 1996-09-05 Hawera Probst Kg Hartmetall Bohrkrone für drehschlagendes Bohren von vorzugsweise Gestein, Beton oder dergleichen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3548C (de) * W. Stoz, Bohr-Ingenieur, in Stuttgart Bohrapparat mit Hohlgestänge zum Betriebe mit Wasserspülung
FR1002187A (fr) * 1946-08-10 1952-03-03 Krupp Gmbh Perforatrice à percussion
DE841892C (de) * 1950-12-12 1952-06-19 Deilmann Bergbau G M B H C Verfahren und Vorrichtung zur Herstellung von Kern-Bohrloechern grossen Durchmessers
DE2602238A1 (de) * 1976-01-22 1977-08-04 Bosch Gmbh Robert Bohrkrone
DE2735368A1 (de) * 1977-08-05 1979-02-15 Hawera Probst Kg Hartmetall Gesteinsbohrer mit hartmetall- bohrkopf
DE2856205A1 (de) * 1978-12-27 1980-07-10 Hilti Ag Gesteinsbohrer
DE2913501A1 (de) * 1979-04-04 1980-10-16 Bosch Gmbh Robert Hohlbohrer mit bohrkrone
GB2052603A (en) * 1979-06-13 1981-01-28 Inst Gornogo Dela Sibirskogo O Rock-breaking tool for percussive-action machines

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652518B2 (de) * 1967-05-10 1976-11-11 Friweg-Werkzeug Fritz Wegner Gmbh & Co, 2000 Hamburg Drehschlagbohrkrone
JPS5153514Y2 (fr) * 1973-12-01 1976-12-21
DE2637847A1 (de) * 1976-08-23 1978-03-02 Hilti Ag Meissel mit ringfoermiger schneide

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3548C (de) * W. Stoz, Bohr-Ingenieur, in Stuttgart Bohrapparat mit Hohlgestänge zum Betriebe mit Wasserspülung
FR1002187A (fr) * 1946-08-10 1952-03-03 Krupp Gmbh Perforatrice à percussion
DE841892C (de) * 1950-12-12 1952-06-19 Deilmann Bergbau G M B H C Verfahren und Vorrichtung zur Herstellung von Kern-Bohrloechern grossen Durchmessers
DE2602238A1 (de) * 1976-01-22 1977-08-04 Bosch Gmbh Robert Bohrkrone
DE2735368A1 (de) * 1977-08-05 1979-02-15 Hawera Probst Kg Hartmetall Gesteinsbohrer mit hartmetall- bohrkopf
DE2856205A1 (de) * 1978-12-27 1980-07-10 Hilti Ag Gesteinsbohrer
DE2913501A1 (de) * 1979-04-04 1980-10-16 Bosch Gmbh Robert Hohlbohrer mit bohrkrone
GB2052603A (en) * 1979-06-13 1981-01-28 Inst Gornogo Dela Sibirskogo O Rock-breaking tool for percussive-action machines
DE2928445A1 (de) * 1979-06-13 1981-01-29 Inst Gornogo Dela Sibirskogo O Bohrwerkzeug fuer schlagmaschinen
FR2461804A1 (fr) * 1979-06-13 1981-02-06 Inst Gornogo Dela Sibirskogo O Outil de forage pour appareil a percussion
US4280573A (en) * 1979-06-13 1981-07-28 Sudnishnikov Boris V Rock-breaking tool for percussive-action machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334806A1 (fr) * 1988-03-21 1989-09-27 HILTI Aktiengesellschaft Couronne de forage de roche
WO1989011580A1 (fr) * 1988-05-23 1989-11-30 Vsesojuzny Nauchno-Issledovatelsky Institut Transp Instrument pour perçage rotatif a percussion
US5004056A (en) * 1988-05-23 1991-04-02 Goikhman Yakov A Percussion-rotary drilling tool
CN104741667A (zh) * 2015-03-23 2015-07-01 深圳市圆梦精密技术研究院 套式孔加工钻头
CN112832796A (zh) * 2021-03-16 2021-05-25 中国铁建重工集团股份有限公司 Tbm刀盘、tbm及硬岩致裂tbm掘进方法

Also Published As

Publication number Publication date
DE3049135A1 (de) 1982-07-15
DE3049135C2 (fr) 1991-09-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT NL SE

KL Correction list

Free format text: 82/05

17P Request for examination filed

Effective date: 19821022

STAA Information on the status of an ep patent application or granted ep patent

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18R Application refused

Effective date: 19841026

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PEETZ, WOLFGANG, DIPL.-ING.

Inventor name: KLAISSLE, SIEGFRIED

Inventor name: HAUSSMANN, AUGUST