EP0937191B1 - Fleuret a rocher - Google Patents

Fleuret a rocher Download PDF

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Publication number
EP0937191B1
EP0937191B1 EP97949917A EP97949917A EP0937191B1 EP 0937191 B1 EP0937191 B1 EP 0937191B1 EP 97949917 A EP97949917 A EP 97949917A EP 97949917 A EP97949917 A EP 97949917A EP 0937191 B1 EP0937191 B1 EP 0937191B1
Authority
EP
European Patent Office
Prior art keywords
face
flank
angle
cutting plate
cutting
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
EP97949917A
Other languages
German (de)
English (en)
Other versions
EP0937191A1 (fr
Inventor
August Haussmann
Mathias Fuss
Bernhard Moser
Thomas Wagegg
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27216815&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0937191(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19734094A external-priority patent/DE19734094A1/de
Application filed by Hawera Probst GmbH filed Critical Hawera Probst GmbH
Publication of EP0937191A1 publication Critical patent/EP0937191A1/fr
Application granted granted Critical
Publication of EP0937191B1 publication Critical patent/EP0937191B1/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

Definitions

  • Conventional rock drills consist of a drill shank and a drill head, in which a side view roof-shaped hard metal cutting element is used (see Fig. 1 of EP 0 452 255 B1).
  • the cutting element has on both sides of the Roof-shaped face wedge-shaped edges or rake faces, each with an upper cutting edge.
  • the cutting edges are opposite a vertical one Center plane of symmetry laterally offset, so that So-called cross cuts occur (see FIG. 2 of EP 0 452 255 B1).
  • That behind the cutting edge in the direction of rotation arranged open spaces usually have one Open space angle of approx. 20 ° - 30 ° compared to a normal one Cutting edge angle or rake face angle of 60 ° of the rake face on, with the angles facing a vertical plane the longitudinal axis of the drill can be measured.
  • the roof-shaped insert made of hard metal can the drill head completely over its entire diameter enforce and usually forms an additional lateral protrusion to form the nominal diameter.
  • Provided no secondary cutting inserts or corresponding pins available are the transition area from the drill helix to Drill head as a support area for the insert educated.
  • the carbide cutting tip is on the side by a corresponding, voluminous support body in the Drill head supported against breaking out, while Storage areas for the removal of the Form drilling dust.
  • A, 0353 214 is a drill bit with a Cement carbide insert, which is used for the processing of Rock serves.
  • a better solder connection between the Chisel body and the cemented carbide insert are to be produced additional side plates made of cemented carbide are provided, which the Embed main cemented carbide insert.
  • the Sintered carbite insert with respect to its longitudinal median plane constructed symmetrically with side sections with Different tip angles are provided, which lead to a lead improved solder connection.
  • a distinction from different rake faces and open faces is with this Tool not provided.
  • the invention has for its object a drilling tool with improved drilling performance in concrete. It should also have a lower load on the Tungsten carbide cutting tip can be achieved.
  • the drill according to the invention has compared to the known Tools the advantage that a significantly better penetration is caused in the concrete by less "blunt" cutting. This immediately results in a faster one Drilling progress.
  • the one acting on the drilling tool Striking performance will not be blunt on a conventionally Tungsten carbide cutting tip transferred, but through a significantly slimmer design of the drill head overall, the impact performance becomes even more effective in Drilling performance implemented. This allows smaller ones Tool dimensions used in larger rotary hammers without being damaged.
  • Through the inventive design of the end face of the hard metal cutting tool there is also less stress on the Carbide insert itself.
  • each open space is divided into at least two open space sections, e.g. can have approximately the same widths, the indicative of the side wall of the hard metal insert Open space section z. B. about twice as large Can have flank angle, such as that to the cutting edge indicative first open space section.
  • a conventional carbide cutting element on its respective Provide open space with a second open space section, with the open space sections facing upwards directed projection length z. B. about halved.
  • the Open space sections can, however, in their Projection lengths and their free space angles be designed differently.
  • Rake face compared to a conventional embodiment an increased rake face angle of> 60 ° and is formed in particular about 70 °. It can vary depending Optimizing the drilling tool flat or be concave or convex.
  • the tangential or aligned transition to the support surface for the carbide insert a role. was it previously thought that a further increase in the rake face angle and thus an even more pointed design of the carbide insert an increased risk of breakage of the tip of the carbide insert extensive experiments have shown that the improved drilling dust drainage of such a cutting edge Resilience increased.
  • Rake face In this context is also the broadening of Rake face can be seen in the direction of the drill axis, there this reduces the width of the cross cutting edge he follows.
  • the lateral support body for the Carbide cutting tip very slim and also pointed is tapered.
  • the lateral support surfaces as possible tapered, in its outer contour z.
  • the outer contour is flat, is convex or concave, the support surfaces for the carbide cutting plate and thus the outer contour of the Almost or completely tangential or asymptotically in the rake face or in the open face of the Carbide cutting elements passes over.
  • This will Front storage areas avoided.
  • This measure on Drill head can also be used with a conventional one Guide the insert to the desired effect.
  • the Rock drill 1 according to the invention only a hinted Drill shank 2 and a drill head 3 on the in the feed direction 16 facing end face 4 a generally over the diameter D1, in their Broad side view of roof-shaped cutting insert 5 has.
  • This insert 5 has on both sides of it roof-shaped formation with the angle ⁇ in the direction of rotation 8 Pointed, wedge-shaped blades or Rake faces 6, 6 'on, with a negative Rake face angle ⁇ and one formed on the face Cutting edge 7, 7 '.
  • 3b is located on the back of the respective rake face 6, 6 'the so-called free area 10, 10' with a Open area angle of ⁇ approx. 20 ° to 30 ° as the usual value.
  • the smaller value applies to drilling tools with a smaller one Nominal diameter (e.g. ⁇ 12 mm), the larger value for such with a larger nominal diameter.
  • the rake face angle is ⁇ with conventional tools usually ⁇ ⁇ 60 °.
  • there is the first flank angle ⁇ 1 of the first Open space section 11 ⁇ 1 ⁇ 20 to 40 ° and in particular ⁇ 1 20 ° to 30 °.
  • the Flank angles ⁇ 1, ⁇ 2 are compared to one Plane 13 lying perpendicular to the drill axis 9 is measured.
  • the first flank section 11 adjacent to the front cutting edge 7 has a projection length S 1 lying in the plane 13 and the adjoining second flank section 12 has a projection length S 2 , the sum of which is determined as length b ,
  • the ratio S 1 : S 2 can vary depending on the application and is not least chosen in coordination with the projection length S 3 of the rake face 6. For example, S 1 ⁇ (0.4 to 0.7) xb.
  • B S 1 + S 2 + S 3 .
  • the front cutting edge 7 is arranged eccentrically to the vertical center plane 14 of the cutting plate 5 between the rake face 6 and the free surface 11 of the hard metal cutting plate 5.
  • the projection length S 3 of the rake face 6 can have a length of approximately 1/3 to 1/6, in particular 1/5 of the total width B of the cutting plate 5.
  • This arrangement is from FIG. 2 particularly clearly recognizable, preferably a concave Formation of the outer contour 19, 19 'of the support body in Drill head is selected and the front indicative area almost tangential or asympotic in the Side wall 20 of the hard metal insert 5 opens.
  • the support side wall 19, 19 'of the drill head forms consequently a side flank with a curved or arched or cylindrical segment-shaped i.e. concave Outer contour.
  • the Rake face angle ⁇ (also called rake angle) in the Order of magnitude of ⁇ ⁇ 60 °, which is one corresponds to the usual value for a rake angle.
  • the two Open space sections 11, 12 provided with a Open space angle or clearance angle ⁇ 1 ⁇ 20 to 40 ° and in particular ⁇ 1 ⁇ 20 ° and a flank angle or Clearance angle ⁇ 2 ⁇ 40 to 60 ° and in particular ⁇ 2 ⁇ 60 °.
  • the second open area section 12 again goes tangential or asymptotically into the further side wall 26, 26 ', so that there is also an extremely slim side Drill head without storage areas opposing the drilling dust forms.
  • the side walls 25, 26 and 25 ', 26' are through the kink line 27 separately (see FIGS. 5 and 7).
  • FIG. 4a in an enlarged representation (5: 1) of FIG. 4, the lengths s 1 to s 3 of the flank sections 11, 12 and the rake faces 6 projected into the horizontal plane 13 are formed.
  • the actual lengths of the flank sections 11, 12 or the rake face 6 result from the projection lengths s 1 to s 3 divided by the cosine of the respective angle ⁇ 1, ⁇ 2 or ⁇ .
  • FIG. 5 and 7 is a side view of the broad side of the Cutting plate 5 shown. They are in the right part of the figure Open space sections 11, 12, in the left part of the figure Rake face 6 can be seen with the respective on this Surface sections tapering tangentially Sidewall sections 25 ', 26'. Of that in front of the rake face 6 'lying side wall section 25' migrates through the rake 6 'removed drilling dust into the following Bohrmehlnut 22 (see perspective view in Fig. 7).
  • FIG. 6a the insert 5 is with a first Open space section 11 and a second Open space section 12 is shown, as is the case with FIGS. 1, 2 as well as 4 and 5.
  • Fig. 6b there is only one Open space 10 shown symbolically, but also with shortened cross cutting edge 24 due to the above facts.
  • the second open space sections 12th also seen towards the center in their top view Increase width to add an additional reduction here the length 1 of the transverse cutting edge 24 (see area F).
  • This is in Fig. 6c with the edge 28, 28 'between the first and second open space section 11, 12 symbolically shown. Ideally, this in turn leads to an almost punctiform Touch in the area of the drill tip 23.
  • Fig. 6c is the Rake face 6 parallel in its width seen in plan view trained to the outer surface.
  • an optimized Head geometry for optimal drilling progress with optimal drilling dust removal achieved achieves in particular the measures according to the invention.
  • the realization of a slim drill head in which both the rake angle ⁇ enlarged compared to conventional type and several Open space sections are provided.
  • several open space sections are used, which are a kind Result in a polyline.
  • the point is decisive tapered arrangement of the insert with a stepless Transition into the side wall of the drill head.
  • a slim drill head reduces not even the lifespan of the drilling tool. Both The measures according to the invention are rather the opposite.
  • the explanation lies essentially in the fact that the enormous Impact energy of the machine tool much better in that Rock can be implemented, which protects the tool becomes.
  • Experiments have shown that an optimum Drilling performance and service life is achieved when Cutting angle and steel surface of the drill head, which both applies to the rake and clearance angle, tangentially into one another pass.
  • convex insert with convex Rake face 6 enables an even slimmer drill head.
  • the drilling performance compared to that previously described Embodiment can be further increased, however, grows the risk of breaking your head.
  • tougher Concrete or larger pebbles or reinforcements in the general will not be convex Machined insert.
  • the invention can also be used if necessary a single free surface 10 of the insert 5 be, this free area 10 with a steeper Clearance can be equipped as usual. Here would be in particular clearance angle between 35 and 50 ° and in particular 40 ° to choose.
  • Drill head one or more inserts or one Has secondary cutting plate and several secondary cutting elements, the main insert and / or the Secondary cutting elements the characteristic above Features.
  • the invention therefore relates in particular also on the protection of such carbide cutting elements as such, without limitation to one certain drill head geometry.

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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)
  • Drilling Tools (AREA)
  • Steroid Compounds (AREA)

Claims (14)

  1. Fleuret à rocher comportant une tige (2) et une tête de fleuret (3), qui comprend sur sa face frontale dans le sens d'avancement au moins une plaque de coupe (5), comportant au moins un bord de coupe (7) prévu sur la face frontale de la plaque de coupe (5) et une face d'attaque (6) avec un angle de face d'attaque (α) négatif correspondant et une face de dépouille (10) située derrière le bord de coupe (7) frontal, avec un angle de face de dépouille (β) correspondant, la face de dépouille (10) étant divisée en au moins deux tronçons de face de dépouille (11, 12), et une seule face d'attaque (6) étant prévue, dont l'angle de face d'attaque (α) est déjà plus grand sur le bord de coupe (7) que l'angle de face de dépouille (β1) du premier tronçon de face de dépouille (11) avoisinant le bord de coupe (7).
  2. Fleuret à rocher selon la revendication 1,
    caractérisé en ce qu'un premier tronçon de face de dépouille (11) présente un angle de face de dépouille β1 ≈ 20 à 40°, et en particulier β1 ≈ 20° à 30°, et un second tronçon de face de dépouille (12) présente un angle de face de dépouille β2 ≈ 40 à 60°, et en particulier β2 ≈ 60°, avec toutefois toujours β2 > β1' et l'angle de face d'attaque α et les angles de face de dépouille β1, β2 sont déterminés par rapport à un plan (13) situé orthogonalement à l'axe de fleuret (9).
  3. Fleuret à rocher selon la revendication 1 ou 2,
    caractérisé en ce que le premier tronçon de face de dépouille (11) avoisinant la lame ou le bord de coupe (7) frontal, présente une longueur de projection S1 située dans le plan (13), et le second tronçon de face de dépouille (12) voisin présente une longueur de projection S2, dont la somme donne une longueur b, avec S1 ≈ (0.4 à 0,7) x b.
  4. Fleuret à rocher selon l'une des revendications 1 à 3,
    caractérisé en ce que le bord de coupe frontal (7) de la plaque de coupe (5) en métal dur, est situé de façon excentrique par rapport au plan central (14) de la plaque de coupe (5), la longueur de projection S3 de la face d'attaque (6) présentant une grandeur d'environ 1/3 à 1/6 et en particulier 1/5 de la largeur globale B de la plaque de coupe (5).
  5. Fleuret à rocher comportant une tige (2) et une tête de fleuret (3), qui comporte sur sa face frontale dans le sens d'avancement au moins une plaque de coupe (5), comportant au moins un bord de coupe (7) prévu sur la face frontale de la plaque de coupe (5) et une face d'attaque (6) présentant un angle de face d'attaque (α) négatif correspondant et une face de dépouille (10) située derrière le bord de coupe (7) frontal, présentant un angle de face de dépouille (β) correspondant,
    caractérisé en ce que la plaque de coupe (5) présente une seule face d'attaque (6), et l'angle de face d'attaque (α) présente une valeur de 60 à 80° et en particulier α ≈ 70°, la plaque de coupe (5) étant insérée dans la tête de fleuret (3) de sorte que les corps d'appui (15, 15') de la tête de fleuret, prévus des deux côtés de la plaque de coupe (5), présentent un contour externe (19, 19') qui débouche sans formation de face de retenue frontale, dans les parois latérales (20) de la plaque de coupe (5).
  6. Fleuret à rocher selon la revendication 1 ou 5,
    caractérisé en ce que l'on prévoit une face d'attaque (6) plane et s'étendant sous un angle d'attaque (α) constant ou en ce que la face d'attaque (6) est formée de façon convexe ou en particulier concave.
  7. Fleuret à rocher selon la revendication 5,
    caractérisé en ce que la plaque de coupe (5) présente un angle de face d'attaque α avec une valeur de 60 à 80°, et en particulier α ≈ 70°, et une unique face de dépouille (10) présentant un angle de dépouille β ≈ 35 à 50°, et en particulier 40°, ou plusieurs faces de dépouille (11,12).
  8. Fleuret à rocher comportant une tige (2) et une tête de fleuret (3), qui comporte sur sa face frontale dans le sens d'avancement au moins une plaque de coupe (5) comportant au moins un bord de coupe (7) prévu sur la face frontale de la plaque de coupe (5) et une face d'attaque (6) présentant un angle de face d'attaque (α) négatif correspondant et une face de dépouille (10) située derrière le bord de coupe (7) frontal, présentant un angle de face de dépouille (β) correspondant,
    caractérisé en ce que la face d'attaque (6) et/ou un second tronçon de face de dépouille (12) de la plaque de coupe (5), pour réduire la longueur (1) de la lame transversale (24) relativement à la vue en plan de l'outil, s'agrandit vers la pointe de fleuret (23), dans sa largeur vue selon une vue en plan sur l'outil de forage.
  9. Fleuret à rocher selon l'une des revendications 1 à 8,
    caractérisé en ce que la plaque de coupe (5) est insérée dans la tête de fleuret (3) de sorte que les corps d'appui (15, 15') prévus des deux côtés de la plaque de coupe (5) présentent un contour externe (19, 19') qui passe ou débouche à peu près ou directement de façon tangentielle dans le second tronçon de face de dépouille (11) et/ou dans la face d'attaque (6) et/ou dans la paroi latérale (20) de la plaque de coupe (5).
  10. Fleuret à rocher selon l'une des revendications 1 à 9,
    caractérisé en ce que le corps d'appui (15, 15') de la tête de fleuret (3), prévu des deux côtés de la plaque de coupe (5), présente un contour externe (19, 19') cintré au moins largement à la manière d'un segment cylindrique à deux dimensions ou de façon concave ou plan, qui ne forme pas de face de retenue frontale et qui débouche dans la paroi latérale (20) de la plaque de coupe (5) en métal dur.
  11. Fleuret à rocher selon l'une des revendications 1 à 10,
    caractérisé en ce que le contour externe (19, 19') du corps d'appui (15, 15') est formé dans la tête de fleuret (3) au moins en partie de façon convexe.
  12. Fleuret à rocher selon l'une des revendications 1 à 11,
    caractérisé en ce que la plaque de coupe (5) s'étend au moins sur tout le diamètre D1 de la tête de fleuret (3) et est formée, dans sa vue en largeur, sous forme de toit avec un angle γ ≈ 130°.
  13. Fleuret à rocher selon l'une des revendications précédentes 1 à 12,
    caractérisé en ce que la tête de fleuret présente une ou plusieurs plaques de coupe et, en particulier, une plaque de coupe principale et plusieurs éléments de coupe auxiliaires.
  14. Fleuret à rocher comportant une tige (2) et une tête de fleuret (3), qui comporte sur sa face frontale dans le sens d'avancement au moins une plaque de coupe (5), comportant au moins un bord de coupe (7) prévu sur la face frontale de la plaque de coupe (5) et une face d'attaque (6) présentant un angle de face d'attaque (α) négatif correspondant et une face de dépouille (10) située derrière le bord de coupe (7) frontal, présentant un angle de face de dépouille (β) correspondant, la face de dépouille (10) présentant un contour cintré de façon convexe, et une seule face d'attaque (6) étant prévue, dont l'angle de face d'attaque (α) est plus grand que l'angle de face de dépouille (β1) du contour de la face de dépouille (10), cintré de façon convexe au voisinage du bord de coupe (7).
EP97949917A 1996-11-11 1997-11-11 Fleuret a rocher Expired - Lifetime EP0937191B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE19646471 1996-11-11
DE19646471 1996-11-11
DE19734093 1997-08-07
DE19734094A DE19734094A1 (de) 1996-11-11 1997-08-07 Gesteinsbohrer
DE19734093A DE19734093A1 (de) 1996-11-11 1997-08-07 Gesteinsbohrer
DE19734094 1997-08-07
PCT/DE1997/002658 WO1998021442A1 (fr) 1996-11-11 1997-11-11 Fleuret a rocher

Publications (2)

Publication Number Publication Date
EP0937191A1 EP0937191A1 (fr) 1999-08-25
EP0937191B1 true EP0937191B1 (fr) 2002-05-29

Family

ID=27216815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97949917A Expired - Lifetime EP0937191B1 (fr) 1996-11-11 1997-11-11 Fleuret a rocher

Country Status (6)

Country Link
US (1) US6260637B1 (fr)
EP (1) EP0937191B1 (fr)
JP (1) JP3819439B2 (fr)
AT (1) ATE218180T1 (fr)
DK (1) DK0937191T3 (fr)
WO (1) WO1998021442A1 (fr)

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WO2012159947A2 (fr) 2011-05-24 2012-11-29 Robert Bosch Gmbh Foret à pierre pourvu de rainures de dégagement

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Publication number Priority date Publication date Assignee Title
WO2012159947A2 (fr) 2011-05-24 2012-11-29 Robert Bosch Gmbh Foret à pierre pourvu de rainures de dégagement

Also Published As

Publication number Publication date
ATE218180T1 (de) 2002-06-15
WO1998021442A1 (fr) 1998-05-22
JP3819439B2 (ja) 2006-09-06
US6260637B1 (en) 2001-07-17
DK0937191T3 (da) 2002-09-16
JP2001504179A (ja) 2001-03-27
EP0937191A1 (fr) 1999-08-25

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