EP0322554A1 - Trépan de roche - Google Patents

Trépan de roche Download PDF

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Publication number
EP0322554A1
EP0322554A1 EP88119291A EP88119291A EP0322554A1 EP 0322554 A1 EP0322554 A1 EP 0322554A1 EP 88119291 A EP88119291 A EP 88119291A EP 88119291 A EP88119291 A EP 88119291A EP 0322554 A1 EP0322554 A1 EP 0322554A1
Authority
EP
European Patent Office
Prior art keywords
groove
conveyor
conveying
drill
drill according
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.)
Granted
Application number
EP88119291A
Other languages
German (de)
English (en)
Other versions
EP0322554B1 (fr
Inventor
Wolfgang Dipl.-Ing. Peetz
Bernhard Moser
Hermann Hugger
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
Priority claimed from DE19873740692 external-priority patent/DE3740692A1/de
Application filed by Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG, Hawera Probst GmbH filed Critical Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Publication of EP0322554A1 publication Critical patent/EP0322554A1/fr
Application granted granted Critical
Publication of EP0322554B1 publication Critical patent/EP0322554B1/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
    • 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
    • E21B10/56—Button-type inserts

Definitions

  • the invention relates to a rock drill according to the preamble of claim 1.
  • spiral feed coils of rock drills are machined or machined to incorporate the flutes into the generally cylindrical starting material.
  • the main task of rock drill bits is the material loosened by the hard metal cutting edge, i.e. H. extract the drilling dust or cuttings from the borehole.
  • the size of the drilling groove, i.e. H. The free cross-section of the conveyor plays a crucial role in the performance of the drill.
  • H. good drilling dust transport ensures good feed and prevents chatter marks in the borehole and damage to the drill due to jamming, overheating or the like. If the drill jams, there is also a risk of accidents for the operator.
  • a large drilling dust conveying groove with the appropriate shape therefore guarantees a sufficiently good drilling dust transport. This has a significant impact on the service life of the drilling tool.
  • the conveying groove cross section is chosen so large in known drills that there is a diameter ratio of the core diameter to the conveying helix diameter of approximately 0.5.
  • Such a large conveying groove cross-section for transporting the drilling dust is necessary for high-performance tools.
  • a large conveying groove cross section has the disadvantage that the core diameter of the conveying helix is greatly weakened. If the drill is blocked, breaks in the area of the core cross section weakened by the conveying groove can occur. At least very high-quality tool steel made of alloyed steels must be used to meet the requirements.
  • the cross-section can also be weakened by core bores for the cooling medium.
  • a drilling tool for use as a rock drill with a hard metal cutting tip which consists of a rolled basic profile with two longitudinal ribs and whose feed spiral is produced by twisting or twisting the basic profile.
  • the ratio of the helix diameter to the core diameter is> 0.5, as is customary with rock drills.
  • the helix formed by the twisted longitudinal ribs has only unsatisfactory transport properties for the drilling dust due to its shape. In particular, there are congestion and jamming due to the small conveying groove cross section.
  • the drilling properties of such a tool are far inferior to normal drilling tools in terms of drilling dust transport. This also applies to the tools according to DIN 20 377, July 1979.
  • the invention has for its object to provide a drilling tool, in particular en rock drill for impact stress, which avoids the disadvantages mentioned above, in particular equally good or improved conveying properties with a smaller conveying groove cross-section, i. H. has a larger core diameter or core cross section.
  • the invention is based on the knowledge that an improvement in the conveying properties of conveying helixes is only possible through constructive measures within the conveying groove.
  • the conveying properties of a conveying groove are improved in such a way that a smaller conveying cross section for drilling dust is sufficient for the same conveying quantity, the core diameter or the core cross section of the conveying helix can be made larger. This improves the strength of the drill core in the area of the feed helix, ie the risk of breakage is reduced.
  • Conveying groove cross section also has the advantage that a material with lower strength properties can be used due to the larger core diameter. As a result, a cheaper starting material can be used for the production of the conveyor helix.
  • the improvement or maintenance of the good conveying properties despite the reduction in the conveying groove cross section and thus the enlargement of the core cross section is achieved according to the invention in that several conveying grooves interact.
  • a continuous and uninterrupted main conveying groove is formed which interacts with a secondary conveying groove with a smaller pitch.
  • the secondary conveyor groove is formed by conveyor ribs which are located in the main conveyor groove. Due to the flatter slope, ie a larger swirl angle, the secondary conveyor groove runs with a smaller pitch than the main conveyor groove. This leads to a constant additional relative movement of the drilling dust transported in the main production groove, which leads to a loosening and thus to a better transport of the drilling dust in the main production groove.
  • the conveying ribs of the secondary conveying groove accordingly significantly improve the conveying capacity of the drilling dust by shifting and loosening, which has the consequence that an otherwise inadequate conveying groove cross section, which tends to become blocked, is nevertheless sufficient for optimal drilling dust transport.
  • the improved conveying properties as a result of the interaction of the main conveying groove and the secondary conveying groove mean that optimal conveying properties can also be achieved with a smaller conveying groove cross section.
  • the smaller conveying groove cross section enables a larger core cross section of the conveying helix, which contributes to increasing its strength against the risk of breakage or permits the use of material of lower strength.
  • the conveying properties are decisively improved by an interaction of the main conveying groove with intermediate conveying ribs of the secondary conveying groove with a smaller pitch, which leads to a reduction in the conveying groove cross section and thus to a more favorable ratio of core diameter to conveying screw diameter.
  • the limiting profiles or longitudinal profiles of the main conveying groove and / or the interrupted conveying ribs of the secondary conveying groove have suitable cross-sectional profiles, in particular a square, trapezoidal or circular cross-section. Any known profile can be used for the main conveyor groove.
  • the essence of the invention therefore lies in the additional equipment of a suitable continuous main conveyor groove with individual conveyor ribs to form a secondary conveyor groove.
  • the diameter of the secondary conveying groove formed by the conveying ribs is the same size or smaller than the diameter of the main conveying groove formed by the longitudinal profiles.
  • the correct ratio of the height of the secondary conveyor groove can be determined empirically in order to achieve the optimal effect of the conveyor with a small conveyor groove cross section.
  • the main conveying groove and / or the secondary conveying groove can be formed either by machining, non-cutting machining or by turning a wing profile steel, as described in the introduction to the description.
  • the main conveying groove is created in that a separate longitudinal profile is applied and fastened in a correspondingly introduced helical recess.
  • the secondary conveyor groove is formed in that pocket-shaped recesses or cutouts are produced with the conveyor ribs formed in between.
  • This cutting shape enables a wide variety of rib shapes to be formed for the secondary conveyor groove.
  • the conveying ribs of the secondary conveying groove can have different swirl angles, ie. H. have different heights.
  • the material loosening is caused by the ratio of the different slopes of the main and secondary conveyor groove and by different slopes of the secondary conveyor groove itself. For this, preferred values are given in sub-claim 9.
  • a twisted wing profile with longitudinal ribs is used as the starting material for the conveying helix to form a main conveying groove, the conveying ribs for the secondary conveying groove also being used as webs in the initial profile are rolled on.
  • the wings of which form the main conveying groove and into which the conveying ribs for the secondary conveying groove are introduced by machining are a well-known profile rolled steel according to DIN 488 parts 2 and 3 is a suitable starting material for a drilling tool with main conveyor groove and secondary conveyor groove; 6/86.
  • the clamping shank for the hammer drill should be made of a higher quality material, the connection between the different materials being made, for example, by means of a friction weld connection or soldering or the like.
  • a specially matched drill head enables optimum assignment of the drilling dust from the drill head to the drilling dust grooves by assigning the cutting plate to the longitudinal profiles or longitudinal ribs.
  • the additional cutting pins in the calculation of the end face of the drill head ensure that the drilling dust is present as a sufficiently fine substrate so that it can be transported unhindered in the flat drilling dust grooves.
  • the rock drill shown in side view in FIG. 1 and in cross section in FIG. 2 has a feed helix (1), a drill head (2) with a hard metal cutting element (3) and a clamping shaft (4).
  • the arranged between the clamping shaft (4) and drill head (2) two-start feed helix (1) with a cylindrical core cross-section (13) consists of the two main feed grooves (5, 5 '), formed by the two helical longitudinal profiles (6, 7).
  • the main conveyor groove (5, 5 ') formed by the longitudinal profiles (6, 7) has a small swirl angle ⁇ 1 ⁇ 15 to 25 °, ie a relatively steep slope.
  • a secondary conveyor groove (8) embedded, embedded or integrated, formed or limited by the conveyor ribs (9), with a larger swirl angle ⁇ 2 between 30 to 80 °, preferably 35 °.
  • the slope of the secondary conveyor groove (8) is therefore much flatter than that of the main conveyor groove (5).
  • the secondary conveyor groove (8) is limited by the longitudinal ribs (6, 7) of the main conveyor groove (5), but it continues in the second main conveyor groove (5 '). Accordingly, individual conveyor rib sections (9) are formed.
  • the secondary conveyor groove (8) can therefore be regarded as a helical groove interrupted by the longitudinal profiles (6, 7).
  • the main conveyor groove (5) shown in the front view executes just half a pitch H / 2.
  • the pitch H of the main conveyor groove (5) therefore corresponds to the pitch h of the secondary conveyor groove (8) as 1:12.
  • these values can vary.
  • the drill diameter D is determined by the carbide cutting element (3).
  • the diameter d 1 of the main conveyor groove (5) formed by the longitudinal profiles (6, 7) is slightly smaller than the diameter D of the hard metal cutting edge (3).
  • the carbide cutting edge protrudes approx. S ⁇ 0.3 to 2 mm per side.
  • the core diameter d2 of the cylindrical core of the conveyor helix (1) relates to the diameter d1 of the main conveyor groove (5) formed by the longitudinal profiles (6, 7) as follows: d2: d1 ⁇ 0.8. It follows from this that the free conveying cross section of the main conveying groove is considerably smaller than in conventional drilling tools, where the ratio is approximately 0.5.
  • the diameter d3 of the secondary conveyor groove (8) formed by the conveyor ribs (9) is slightly smaller than the diameter d1 of the longitudinal profiles (6, 7) and lies between the values of d1 and d2.
  • the drilling tool consists of a cylindrical core area (13) with incorporated or applied longitudinal profiles (6, 7) to form the main conveying groove (5, 5 ') and likewise incorporated or applied conveying ribs (9) to form the secondary conveying groove ( 8th).
  • the secondary conveyor groove (8) with conveyor ribs (9), with a flat slope can first be produced as a continuous, initially uninterrupted conveyor spiral (8). Then two helical recesses or cutouts are made in the form of the longitudinal profiles (6, 7) to be used, which separate the initially continuous helical secondary conveyor groove (8) with conveyor ribs (9) into individual conveyor rib sections (9).
  • FIG. 1 the drilling tool consists of a cylindrical core area (13) with incorporated or applied longitudinal profiles (6, 7) to form the main conveying groove (5, 5 ') and likewise incorporated or applied conveying ribs (9) to form the secondary conveying groove ( 8th).
  • the secondary conveyor groove (8) with conveyor ribs (9), with a flat slope can first be produced as a continuous, initially uninterrupted
  • the longitudinal profiles (6, 7) with a circular cross section (10) or square cross section (11) or the like are then inserted into the recess produced in this way and fastened, for example, by means of a soldered connection (12) .
  • the recess can extend into the core area (13) of the conveyor helix (1).
  • the two-course main conveyor groove (5, 5 ') for the drilling dust is formed by the longitudinal profiles (6, 7), which are designed as recessed profiles (10, 11).
  • This main conveyor groove (5, 5 ') is then divided by the conveyor ribs (9) into a plurality of secondary conveyor grooves (8). This results in the relative movement of the drilling dust during transport in the helix (1).
  • the core region (13) is cylindrical.
  • the core area of the main conveying groove (5) can also have other geometrical shapes.
  • the drilling tool in Fig. 3 in cross section consists of an initially circular cylindrical wing profile (13) with the longitudinal profiles (6, 7) to form a double-start conveyor helix (1) with main conveyor grooves (5, 5 ').
  • the diameter formed by the longitudinal ribs (6, 7) is again indicated with d1.
  • the secondary conveying grooves (8) with the conveying ribs (9) are produced in the exemplary embodiment according to FIGS. 3 and 4 in that a part (14) of the initially circular core region (13) tangentially z. B. is milled, so that recesses or pockets (14) form.
  • the conveyor ribs (9) and thus the secondary conveyor grooves (8) are formed here.
  • the core diameter decreases in this area to d2 '.
  • the depth of the recess (14) depends on the desired geometric shape. Normally, it is a flat recess (14), which in special cases can, however, also be curved, convex or concave.
  • the drilling tools shown in FIGS. 5 to 7 are a rolled and then twisted or twisted circular cylindrical wing profile (15) as the starting material with rolled longitudinal ribs (16, 17) to form a main conveying groove (18).
  • the longitudinal ribs (16, 17) run parallel to the drill center axis (19).
  • the longitudinal ribs (16, 17) shown in FIG. 5 result to form the main conveying groove (18).
  • the secondary conveyor groove (20) is formed by the conveyor ribs (21), with the swirl angle ⁇ 2 as previously described.
  • the helix angle of the main conveyor groove (18), formed by the Longitudinal webs (16, 17) is designated with ⁇ 1.
  • the conveying ribs (21) for forming the secondary conveying groove (20) are already present in the initial profile as transverse webs between the longitudinal ribs (16, 17).
  • the cross section of the conveying ribs (21) is similar to that of the longitudinal ribs (16, 17), these cross sections in particular being trapezoidal.
  • Each conveyor rib (21) extends between the two longitudinal ribs (16, 17), the trapezoidal height of the cross section of the conveyor ribs (21) towards the end regions continuously decreasing towards zero. The conveyor ribs (21) therefore merge into the core surface of the groove at its outlet.
  • the twist angle ⁇ 2, ⁇ 2 ′, ⁇ 2 ⁇ can have different values between 30 and 80 °, the respective twist angle ⁇ 1 of the main conveyor groove (18) always being smaller than the twist angle ⁇ 2 of the secondary conveyor groove.
  • ⁇ 2 ⁇ 2 x ⁇ 1. 6 is ⁇ 2 ⁇ 35 °, ⁇ 2 ' ⁇ 40 to 45 °.
  • a third type of conveyor ribs (21) is also provided, the angle ⁇ 2 ⁇ ⁇ 60 to 65 °.
  • the conveyor rib with the largest swirl angle ⁇ 2 ⁇ is arranged between the two conveyor ribs with the smaller swirl angles ⁇ 2, ⁇ 2 ⁇ .
  • the shape of the exemplary embodiments according to FIGS. 5 to 7 can be found, for example, in DIN 488, Part 2, 6/86.
  • the clamping shaft (4) shown in Figures 1 and 5 is with the respective conveyor helix (1) z. B. attached via a friction weld (22).
  • High-quality tool steel is used as the material for the clamping shank (4) in order to withstand the load in the rotary hammer.
  • a material with lower strength properties for example normal structural steel, is sufficient as the material for the conveyor helix (1), since the increase in cross-section of the core increases the strength with the same conveying capacity.
  • a central bore or through bore (23) is shown in dashed lines as an alternative solution.
  • This hole can be used as a suction hole or coolant hole.
  • the use of a thick-walled tube as a starting material for the conveyor spiral is then appropriate.
  • the drill has a drill head (2) with a diameter of over the entire diameter Cutting head (2) extending cutting plate (3) made of hard metal.
  • the cutting plate (3) is arranged such that it is aligned with its outer, lower end (25) with the longitudinal profiles (6, 7) or the longitudinal ribs (16, 17), ie the longitudinal profiles (6, 7) or the Longitudinal ribs (16, 17) merge almost continuously in the area of the drill head into the laterally protruding ends of the cutting element (3). This can be seen, for example, from FIG. 6.
  • the preferred embodiment of the drill head further provides that cutting pins (26, 27) are arranged on the end face (24) of the drill head (2). These cutting pins (26, 27) can be arranged in their longitudinal axis (28) parallel or at an angle ⁇ to the central axis (19) of the drill.
  • the cutting pins (26, 27) can be distributed symmetrically (27) or asymmetrically (26) on the end face (24) of the drill head.
  • the radial arrangement of the pins (26, 27) can also vary, i. H. the pin (26) lies on an inner radius r1, the pin (27) on a larger radius r2.
  • a further cutting pin (29) can be arranged on an outermost radius r3 (see FIG. 9), this outermost cutting pin (29) coming to rest almost or on the diameter D formed by the cutting plate (3). (The cutting pin (29) is not shown in FIG. 8.)
  • the cutting pins (26, 27, 29) made of hard metal support the drilling result considerably, in particular with regard to the fine grain of the drilling dust.
  • a finer drilling dust can, however, be better transported in the grooves with a small groove cross-section without the tendency to clog.
  • the drill head is an optimal addition to the helix design according to the invention.

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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)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
EP88119291A 1987-12-01 1988-11-21 Trépan de roche Expired - Lifetime EP0322554B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873740692 DE3740692A1 (de) 1987-09-18 1987-12-01 Gesteinsbohrer
DE3740692 1987-12-01

Publications (2)

Publication Number Publication Date
EP0322554A1 true EP0322554A1 (fr) 1989-07-05
EP0322554B1 EP0322554B1 (fr) 1992-11-04

Family

ID=6341652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119291A Expired - Lifetime EP0322554B1 (fr) 1987-12-01 1988-11-21 Trépan de roche

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Country Link
EP (1) EP0322554B1 (fr)
DE (1) DE3875710D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5462130A (en) * 1993-05-05 1995-10-31 Hawera Probst Gmbh Drilling tool
WO2001066899A3 (fr) * 2000-03-09 2001-12-06 Hawera Probst Gmbh Outil de forage de roche
WO2012143174A1 (fr) * 2011-04-19 2012-10-26 Robert Bosch Gmbh Outil de perçage et procédé de fabrication d'un outil de perçage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE832379C (de) * 1950-06-06 1952-02-25 Carl Sauer Mauer- und Betonschlangenbohrer sowie Verfahren zu seiner Herstellung
US3360960A (en) * 1966-02-16 1968-01-02 Houston Oil Field Mat Co Inc Helical grooved tubular drill string
DE2350985A1 (de) * 1973-10-11 1975-04-24 Uwe C Seefluth Gesteinsbohrer mit vorrichtung zur absaugung des bohrstaubes
EP0201724A2 (fr) * 1985-05-15 1986-11-20 Hawera Probst GmbH + Co. Spirale transporteuse remplaçable pour trépan de roche
EP0226537A2 (fr) * 1985-12-16 1987-06-24 HILTI Aktiengesellschaft Trépan de roche
EP0126409B1 (fr) * 1983-05-18 1987-09-23 Hawera Probst GmbH + Co. Outil de forage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE832379C (de) * 1950-06-06 1952-02-25 Carl Sauer Mauer- und Betonschlangenbohrer sowie Verfahren zu seiner Herstellung
US3360960A (en) * 1966-02-16 1968-01-02 Houston Oil Field Mat Co Inc Helical grooved tubular drill string
DE2350985A1 (de) * 1973-10-11 1975-04-24 Uwe C Seefluth Gesteinsbohrer mit vorrichtung zur absaugung des bohrstaubes
EP0126409B1 (fr) * 1983-05-18 1987-09-23 Hawera Probst GmbH + Co. Outil de forage
EP0201724A2 (fr) * 1985-05-15 1986-11-20 Hawera Probst GmbH + Co. Spirale transporteuse remplaçable pour trépan de roche
EP0226537A2 (fr) * 1985-12-16 1987-06-24 HILTI Aktiengesellschaft Trépan de roche

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5462130A (en) * 1993-05-05 1995-10-31 Hawera Probst Gmbh Drilling tool
WO2001066899A3 (fr) * 2000-03-09 2001-12-06 Hawera Probst Gmbh Outil de forage de roche
US6742610B2 (en) 2000-03-09 2004-06-01 Hawera Probst Gmbh Rock drill
WO2012143174A1 (fr) * 2011-04-19 2012-10-26 Robert Bosch Gmbh Outil de perçage et procédé de fabrication d'un outil de perçage

Also Published As

Publication number Publication date
EP0322554B1 (fr) 1992-11-04
DE3875710D1 (de) 1992-12-10

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