EP0790387A1 - Plaque de métal dur, trépan de roche pourvu d'une telle plaque et méthode pour sa fabrication - Google Patents

Plaque de métal dur, trépan de roche pourvu d'une telle plaque et méthode pour sa fabrication Download PDF

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Publication number
EP0790387A1
EP0790387A1 EP97100123A EP97100123A EP0790387A1 EP 0790387 A1 EP0790387 A1 EP 0790387A1 EP 97100123 A EP97100123 A EP 97100123A EP 97100123 A EP97100123 A EP 97100123A EP 0790387 A1 EP0790387 A1 EP 0790387A1
Authority
EP
European Patent Office
Prior art keywords
hard metal
metal plate
drill
receiving groove
side surfaces
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
EP97100123A
Other languages
German (de)
English (en)
Other versions
EP0790387B1 (fr
Inventor
Erich Runge
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.)
Plica Werkzeugfabrik AG
Original Assignee
Plica Werkzeugfabrik 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 Plica Werkzeugfabrik AG filed Critical Plica Werkzeugfabrik AG
Publication of EP0790387A1 publication Critical patent/EP0790387A1/fr
Application granted granted Critical
Publication of EP0790387B1 publication Critical patent/EP0790387B1/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

Definitions

  • the invention relates to hard metal plates and rock drills equipped with them, and to a method for their production.
  • hard metal inserts with a head part carrying at least one cutting edge and with a foot part adapted to the geometry of a receiving groove in the drilling tool are inserted into one or more cut or milled grooves of a drill head or a drill bit and fastened therein by soldering.
  • the locating grooves are generally designed as ordinary continuous rectangular grooves with a constant cross-section.
  • the hard metal plate is usually fixed by caulking in the area of the openings of the receiving grooves to the outer surface of the drill head or the drill bit. This caulking is normally carried out before the hard metal plate is inserted into the receiving groove.
  • the caulking prevents, on the one hand, a radial displacement of the hard metal plate used and, on the other hand, prevents the plate from falling out during subsequent fastening by soldering, welding or gluing.
  • the caulking ensures that a gap is kept clear between the wall of the receiving groove and the hard metal plate used, into which the molten solder can penetrate due to capillary forces.
  • the caulking in the opening area of the receiving groove is too strong, an increased pressure is exerted on the hard metal plate.
  • the hard metal plate is either already damaged when inserting it into the receiving groove or there is an increased risk of breakage during operation of the rock drill due to a chiseling effect of the caulking on the hard metal plate, which then causes the hard metal plate to break at the pressure point.
  • a hard metal plate for drilling tools in particular rock drills, which has a head part carrying at least one cutting edge and a foot part adapted to the geometry of a receiving groove in the drilling tool.
  • the foot part has a cross section that is at least partially expanded compared to the maximum cross section of the head part.
  • the receiving groove in the rock drill is undercut according to the geometry of the foot part.
  • the hard metal plate is secured against radial displacement by caulking in the opening area of the receiving groove to the lateral surface of the drill head.
  • the rock drill described in DE-OS 44 06 513 already has an improved solder connection between the hard metal plate and the receiving groove.
  • the problems mentioned above with regard to the secure centering of the hard metal plate and the increased risk of breakage due to caulking provided in the casing area of the drill head are not eliminated.
  • the invention has for its object to provide a hard metal plate and a rock drill equipped with it, which are designed so that there is a stable and permanent connection between the hard metal plate and the receiving groove in the drilling tool, which can be easily soldered or otherwise attached, a safe centering the hard metal plate and reduces the risk of breakage when operating the rock drill.
  • this object is achieved by a hard metal plate for drilling tools, in particular rock drills, with a head part carrying at least one cutting edge and one adapted to the geometry of a receiving groove in the drilling tool Solved foot part, which is characterized in that the distance between the side surfaces of the foot part is greater in at least a portion of the foot part than in the edge region of the side surfaces of the foot part.
  • the rock drill according to the invention with a shank, a drill head and at least one hard metal cutting plate, which is inserted into at least one receiving groove of the drill head and fastened therein by soldering, welding or gluing, is characterized in that the drill head is equipped with at least one hard metal plate according to the invention, the Receiving groove has a geometry that is adapted to the foot part of the hard metal plate, preferably as precisely as possible, and the hard metal plate is secured against falling out by caulking on the end face of the drill head, preferably in the region of the section with a greater distance between the side faces.
  • the side walls of the receiving groove apart from the wall regions corresponding to the section with a greater distance between the side surfaces of the hard metal plate, preferably run essentially parallel to one another, so that the previous configuration of a rectangular groove can be retained.
  • the hard metal plate or the receiving groove can also have a cross section tapering towards the underside of the hard metal plate or towards the base of the groove, without the purpose of the invention being impaired.
  • the foot part of the hard metal plate inserted into the receiving groove has a section with a greater distance between the two side surfaces, ie a section with a larger internal width, which engages in a correspondingly shaped wall area of the receiving groove, so that a secure centering of the hard metal plate is ensured and at the same time a displacement in the radial direction is prevented.
  • the section with a larger clear width is preferably formed by one or more vertically extending bulges of one or both side surfaces of the hard metal plate.
  • the bulges are in Top view of the head part of the hard metal plate preferably as part-circular bulges. In this case, the corresponding recess in the receiving groove can be made by simply boring. Other bulge geometries are possible, but less preferred due to the poorer manufacturability.
  • the part-circular bulges are preferably formed on both side surfaces of the hard metal plate and lie opposite one another.
  • the bulges on the side surfaces of the hard metal plate can also be arranged offset from one another.
  • the bulges are particularly preferably arranged approximately in the middle of at least one of the side surfaces of the hard metal plate.
  • the hard metal plate can be provided with cutting tips which cause an additional crushing of rock.
  • the cutting tips are preferably arranged in the region of the bulges of the foot part and are formed by an extension of this region beyond the foot part or the edge formed between the head part and the side surfaces of the foot part.
  • the hard metal plate inserted into the receiving groove is secured against falling out by caulking on the end face of the drill head, preferably in the region of the bulge.
  • the caulking overlaps the edge formed between the side surface of the hard metal plate and its head part. This avoids any pressure on the hard metal plate and eliminates the risk of breakage due to the chiseling effect of the caulking.
  • the inventive design of the hard metal plate and the receiving groove enables precise alignment or centering of the hard metal plate, reliably prevents displacement in the radial direction and reduces the loads acting on the hard metal plate.
  • the inventive design ensures that the hard metal plate itself centers in the receiving groove during subsequent soldering, fastening by welding or gluing.
  • the effect of the capillary forces in the gap between the insert and the receiving groove is not interrupted, so that a uniform, thin solder, weld or adhesive joint can form on all sides.
  • the cutting plate is virtually "floating", and the soldered, welded or adhesive connection can optimally absorb the forces acting on the hard metal plate during drilling. This results in increased adhesion of the cutting insert in the receiving groove and a significantly reduced risk of breakage when operating the rock drill.
  • the rock drill equipped with the hard metal plates according to the invention can have an ordinary drill head with only one hard metal cutting plate that extends at least over the entire diameter of the drill head, or a drill bit with two, three or more hard metal cutting plates, which are either arranged in a star shape or intersecting.
  • the drill can have a hard metal cutting plate designed as a centering tip in a known manner.
  • the method for producing the rock drill according to the invention is characterized in that a receiving groove is first introduced into the end face of a drill head or a drill bit, preferably by cutting or milling, the geometry of which is adapted to the geometry of the base part of the hard metal plate according to the invention.
  • the hard metal plate is then inserted into the receiving groove and secured against falling out by caulking a section of the receiving groove that extends beyond the side surface of the hard metal plate on the end face of the drill head, preferably in the region of the bulges of the side face or the section of the foot part with a larger clear width.
  • the hard metal plate is then connected to the drill head in a known manner by soldering, welding or gluing.
  • the hard metal plate 10 according to the invention shown in FIGS. 1 and 2 has two main cutting edges 12 on its head part 14.
  • the side parts 18, 20 of the foot part 16 adjoin the head part 14, which run essentially parallel to one another and the edge when they meet the head part 14 22 train.
  • the distance between the side surfaces 18, 20 of the foot part 16 is greater than in the edge region of the side surfaces of the foot part, i. H. here in the area of the end faces 26 of the hard metal plate 10.
  • the section 24 presents itself as a part-circular bulge of the side surface 18.
  • the bulge 24 is arranged approximately in the middle of the side surface 18. It extends in the vertical direction essentially over the entire height of the side surface 18 of the foot part 16.
  • the bulge 24 can also be arranged at a different location on the side surface 18 and a plurality of bulges 24 can be provided.
  • FIG. 3 shows a plan view of a further embodiment of the hard metal plate 10 according to the invention, in which the part-circular bulge 24 is formed both on the side surface 18 and on the side surface 20.
  • the bulges 24 lie opposite one another and are arranged approximately in the middle of the side surfaces 18 and 20.
  • a plurality of bulges 24, preferably opposite one another, can be formed on each side surface 18 or 20.
  • FIG. 4 shows a further embodiment of a hard metal plate 10 according to the invention.
  • the head part 14 of this hard metal plate has a cutting edge 12 and is in the region of the radially outward direction after insertion into the drill head End face 28 chamfered.
  • the distance between the side surfaces 18 and 20 which run essentially parallel to one another, apart from the section 24, is greater within the central section 24 than in the region of the end surface 28 or the back surface 30.
  • the section 24 extends vertically over the entire height of the side surface 18 and / or the side surface 20 and, viewed in plan view of the head part 14 of the hard metal plate 10, is preferably of part-circular design.
  • the arrangement of the bulge 24 can be the same as in the embodiments described in connection with FIGS. 1 to 3, in particular one or more bulges can be provided on one or both side surfaces 18, 20 of the hard metal plate 10.
  • the hard metal plate 10 can also carry one or more cutting tips 13.
  • the cutting tips 13 are arranged in the region of the part-circular bulges 24 and are formed by an extension of these sections beyond the foot part or the edge 22 formed between the head part and the side surfaces of the foot part.
  • the rock drill according to the invention shown in FIGS. 6 to 8 carries on its shank 32 a drill head 34 with a receiving groove 36 which is rectangular in cross section.
  • the receiving groove extends over the entire diameter of the drill shank 32.
  • a hard metal plate 10 according to that in FIG 3 shown embodiment used.
  • the geometry of the foot part of the hard metal plate 10 is adapted to the geometry of the receiving groove.
  • the bulges 24 in the side faces of the hard metal plate each correspond to part-circular recesses in the walls of the receiving groove 36 in a plan view of the drill head.
  • caulking 38 is formed on the end face 37 of the drill head 34, which overlaps the edge 22 and thus the Carbide plate Secure it from falling out of the receiving groove 36, but without exerting any pressure on the hard metal plate 10.
  • the shaft 32 carries a drill bit 34 with three hard metal cutting plates arranged in a star shape according to the embodiment shown in FIG.
  • the rock drill has another hard metal cutting plate in the form of a centering pin 40.
  • Three receiving grooves 36 with a rectangular cross section are milled into the drill bit 34.
  • the walls of the receiving grooves each have recesses 24 on the side faces of the hard metal plate 10, which are partially circular in plan view.
  • caulking 38 are formed on the end face 37 of the drill bit 34, which overlaps the edge 22 formed between the head part 14 and the side faces of the foot part of the hard metal plate 10. The caulking reliably prevents the hard metal plates 10 from falling out during the subsequent connection or fastening by soldering, welding or gluing.
  • the centering pin 40 preferably carries on its underside a square 42 which is pressed into a corresponding opening 44, preferably a bore, in the drill bit 34. In this way, the centering pin 40 is centered and held when later connecting or fastening.
  • the rock drill according to the invention is manufactured in such a way that the receiving grooves are first milled out and adapted to the geometry of the foot part of the hard metal plates to be used in each case.
  • the recesses in the walls of the receiving grooves corresponding to the bulges of the hard metal plates which are part-circular in plan view can advantageously be produced by drilling or milling the groove at the desired location. Then the geometry the corresponding carbide insert is selected and inserted into the groove. The corresponding lateral bulges or recesses prevent the hard metal plates from moving radially.
  • the hard metal plate By caulking a wall section of the receiving groove on the end face of the drill head or the drill bit, preferably in the region of the bulges 24, which elevates the side wall of the inserted hard metal plate, the hard metal plate is secured against falling out. The caulking no longer has to fix the hard metal plate in a very specific position and therefore does not need to exert any pressure on the hard metal plate.
  • the hard metal plate is connected to the receiving groove in a known manner by soldering, welding or gluing.
  • the resulting soldering, welding or adhesive joint is uniform and thin on all sides, since the hard metal plate is self-centering when it is fastened, in the fluid (solder, welding metal or adhesive) as a result of the capillary forces of equal size on both sides of the hard metal plate . This ensures reliable adhesion of the hard metal plate in the receiving groove and significantly reduces the risk of breakage when operating the drill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Drilling And Boring (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP97100123A 1996-01-16 1997-01-07 Trépan de roche et méthode pour sa fabrication Expired - Lifetime EP0790387B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19601356 1996-01-16
DE19601356A DE19601356A1 (de) 1996-01-16 1996-01-16 Hartmetallplatte und damit bestückter Gesteinsbohrer sowie Verfahren zu dessen Herstellung

Publications (2)

Publication Number Publication Date
EP0790387A1 true EP0790387A1 (fr) 1997-08-20
EP0790387B1 EP0790387B1 (fr) 2000-07-12

Family

ID=7782880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100123A Expired - Lifetime EP0790387B1 (fr) 1996-01-16 1997-01-07 Trépan de roche et méthode pour sa fabrication

Country Status (7)

Country Link
EP (1) EP0790387B1 (fr)
AT (1) ATE194685T1 (fr)
DE (2) DE19601356A1 (fr)
DK (1) DK0790387T3 (fr)
ES (1) ES2151194T3 (fr)
GR (1) GR3034567T3 (fr)
PT (1) PT790387E (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941793A2 (fr) * 1998-03-10 1999-09-15 HILTI Aktiengesellschaft Outil de forage
EP0987398A1 (fr) * 1998-09-09 2000-03-22 Plica Werkzeugfabrik Ag Foret
EP0943779A3 (fr) * 1998-03-18 2000-07-19 Plica Werkzeugfabrik Ag Outil de forage à percussion
WO2004027206A1 (fr) * 2002-09-20 2004-04-01 Boart Longyear Gmbh & Co Kg Outil de forage rotatif avec organe de retenue de plaquette de coupe
EP1892070A2 (fr) * 2006-08-21 2008-02-27 HILTI Aktiengesellschaft Outil de forage avec utilisation d'une arête coupante

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29806084U1 (de) * 1998-04-02 1998-07-30 Plica Werkzeugfabrik Ag Hartmetallplatte und damit bestückter Gesteinsbohrer
DE19915304B4 (de) * 1999-03-22 2006-07-27 Robert Bosch Gmbh Bohrwerkzeug
DE20314813U1 (de) 2003-09-24 2004-03-04 Berner Gmbh Bohrer mit sternförmigem Hartmetalleinsatz
EP4375476A1 (fr) * 2022-11-22 2024-05-29 Hilti Aktiengesellschaft Perforatrice de roches à cinq lames

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1037757A (fr) * 1950-06-22 1953-09-22 Sandvikens Jernverks Ab Lame rapportée pour fleurets de perforatrices à percussion
GB2002661A (en) * 1977-08-18 1979-02-28 Spencer & Sons Ltd Improvements in cutting edges of rotary drills and drill bits
LU85697A1 (fr) * 1984-12-20 1985-07-24 Cerametal Sarl Procede de fabrication d'une meche de forage et plaquette en metal dur pour sa mise en oeuvre
US5287937A (en) * 1992-06-30 1994-02-22 The Sollami Company Drill bits and the blades therefor
DE4406513A1 (de) 1994-02-28 1995-08-31 Plica Werkzeugfabrik Ag Hartmetallplatte und damit bestückter Gesteinsbohrer
US5458210A (en) * 1993-10-15 1995-10-17 The Sollami Company Drill bits and blades therefor

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT350334B (de) * 1977-01-19 1979-05-25 Sfs Stadler Ag Selbstbohrende schraube
US4314616A (en) * 1980-01-28 1982-02-09 Acme-Cleveland Corporation Die-cast masonry drill with leading hard insert
DE3047599A1 (de) * 1980-12-17 1982-07-08 Sortimat Creuz & Co Gmbh, 7057 Winnenden "verfahren und vorrichtung zum anbringen einer hartmetallplatte am kopf eines spiralbohrers"
EP0096147B1 (fr) * 1982-06-10 1987-09-02 Seco Tools Ab Outil de coupe et sa plaquette de coupe
US4488840A (en) * 1982-07-08 1984-12-18 Pollington Bernard M Rotary cutting tool
DE8315355U1 (de) * 1983-05-25 1983-12-01 B.B.W. Bayrische Bohrerwerke GmbH & Co KG, 8391 Büchlberg Hartmetallplatte
DE3602427A1 (de) * 1986-01-28 1987-07-30 Stellram Gmbh Werkzeug zur spanenden formung
US4854789A (en) * 1987-10-27 1989-08-08 Nytd Industries Inc. Cutting tool assembly
DE4003375C1 (fr) * 1990-02-05 1991-05-23 Sfs Stadler Holding Ag, Heerbrugg, Ch
EP0443517B1 (fr) * 1990-02-20 1995-09-06 Sumitomo Electric Industries, Ltd. Foret à embout jetable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1037757A (fr) * 1950-06-22 1953-09-22 Sandvikens Jernverks Ab Lame rapportée pour fleurets de perforatrices à percussion
GB2002661A (en) * 1977-08-18 1979-02-28 Spencer & Sons Ltd Improvements in cutting edges of rotary drills and drill bits
LU85697A1 (fr) * 1984-12-20 1985-07-24 Cerametal Sarl Procede de fabrication d'une meche de forage et plaquette en metal dur pour sa mise en oeuvre
US5287937A (en) * 1992-06-30 1994-02-22 The Sollami Company Drill bits and the blades therefor
US5458210A (en) * 1993-10-15 1995-10-17 The Sollami Company Drill bits and blades therefor
DE4406513A1 (de) 1994-02-28 1995-08-31 Plica Werkzeugfabrik Ag Hartmetallplatte und damit bestückter Gesteinsbohrer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941793A2 (fr) * 1998-03-10 1999-09-15 HILTI Aktiengesellschaft Outil de forage
EP0941793A3 (fr) * 1998-03-10 2002-09-11 HILTI Aktiengesellschaft Outil de forage
EP0943779A3 (fr) * 1998-03-18 2000-07-19 Plica Werkzeugfabrik Ag Outil de forage à percussion
EP0987398A1 (fr) * 1998-09-09 2000-03-22 Plica Werkzeugfabrik Ag Foret
WO2004027206A1 (fr) * 2002-09-20 2004-04-01 Boart Longyear Gmbh & Co Kg Outil de forage rotatif avec organe de retenue de plaquette de coupe
EP1892070A2 (fr) * 2006-08-21 2008-02-27 HILTI Aktiengesellschaft Outil de forage avec utilisation d'une arête coupante
EP1892070A3 (fr) * 2006-08-21 2008-11-26 HILTI Aktiengesellschaft Outil de forage avec utilisation d'une arête coupante

Also Published As

Publication number Publication date
EP0790387B1 (fr) 2000-07-12
PT790387E (pt) 2000-12-29
GR3034567T3 (en) 2001-01-31
ATE194685T1 (de) 2000-07-15
DE59701985D1 (de) 2000-08-17
DK0790387T3 (da) 2000-10-30
DE19601356A1 (de) 1997-07-17
ES2151194T3 (es) 2000-12-16

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