EP1956186A2 - Pointe en métal dur pour un pic à queue ronde - Google Patents

Pointe en métal dur pour un pic à queue ronde Download PDF

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Publication number
EP1956186A2
EP1956186A2 EP08002387A EP08002387A EP1956186A2 EP 1956186 A2 EP1956186 A2 EP 1956186A2 EP 08002387 A EP08002387 A EP 08002387A EP 08002387 A EP08002387 A EP 08002387A EP 1956186 A2 EP1956186 A2 EP 1956186A2
Authority
EP
European Patent Office
Prior art keywords
hard metal
tip
metal tip
longitudinal axis
guide 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.)
Withdrawn
Application number
EP08002387A
Other languages
German (de)
English (en)
Inventor
Gerd Elfgen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1956186A2 publication Critical patent/EP1956186A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1837—Mining picks; Holders therefor with inserts or layers of wear-resisting material characterised by the shape

Definitions

  • the invention relates to a hard metal tip for a round shank chisel, which is halterbar by means of a chisel holder on a rotatable roller of a milling machine, wherein the hard metal tip is radiärsymmetrisch starting from a tip over a body to a foot portion substantially conical and about a longitudinal axis of the round shank chisel and wherein the Corpus from the top to the foot area substantially parallel to each other extending raised guide surfaces.
  • Generic carbide tips are made for example DE 34 42 546 A1 and DE 198 57 451 A1 known.
  • the known carbide tips have with respect to the longitudinal axis in the radial direction inclined guide surfaces.
  • US 5,32A, 098A discloses a hard metal tip having bump-like protrusions inclined in a radial direction with respect to the longitudinal axis to improve powder metallurgy formability.
  • Round shank bits with such carbide tips are used in a generally known manner for the abrasive machining of, for example, asphalt or concrete surfaces by means of rotating cylindrical milling drums.
  • the round shank bit is aligned with its tip pointing outwardly on the surface of the milling drum and against a radial direction of the roller at the mounting location so inclined that its longitudinal axis with a circumferential direction of the roller at this location an angle between five and 45 degrees and angle with a circumferential plane encloses an angle of about seven degrees of angle through a circumference of the roller.
  • the carbide tip rolls upon engagement with the material with a proportion of movement in the circumferential direction of the round shank chisel on the material, so that the round shank bit is rotated about its longitudinal axis.
  • This rotation of the round shank chisel should ensure uniform wear and thus optimum service life of the carbide tip. Without a rotation of the bit or the hard metal tip, the latter would "start up” within a short time, ie wear out on one side, so that the effective wedge angle would be worsened and the cutting power drastically reduced.
  • the known generic carbide tips already provide a significant improvement in rotation compared to a non-profiled carbide tip which is generally known in the wider field of the invention;
  • the rotation about its longitudinal axis is impressed on the round shank bit in the form of a torque when rolling off the hard metal tip by the material to be removed.
  • This torque is produced by a force acting on the hard metal tip in its circumferential direction, namely, by a force acting in the circumferential direction of the carbide tip of a force acting on the hard metal tip in the forward drive direction of the milling drum, ie in a circumferential direction of the milling drum, which is already at unprofiled carbide tips the static friction in contact with the material to be removed results.
  • Improved rotation of the round shank bit is generally achieved by increasing the torque around the bit axis.
  • the known carbide tips increase by means of the relative to the circumferential direction of the milling drum with the longitudinal direction of the carbide tip inclined baffles the adhesion of the carbide tip in contact with the material to be removed and thus acting in the circumferential direction of the milling drum on the carbide tip force:
  • the frictional forces generated at the fins which dig at least in beginnings in the material to be removed, in positive engagement with this material compressive forces that exceed the frictional forces on unprofiled "smooth" carbide tips by a multiple.
  • the invention has for its object to further improve the rotation of the round shank chisel.
  • the guide surfaces are coiled around the longitudinal axis thread.
  • the guide surface located in engagement with the material to be removed is set at an angle relative to the circumferential plane of the milling drum, regardless of the inclination of the round shank chisel. Due to the trigonometric relationships on a hard metal tip according to the invention in the circumferential direction of the round shank chisel effective as torque proportion of acting perpendicular to the guide surfaces compressive force at pitch angles of the guide surfaces between about 30 and about 60 degrees of angle about 50 percent of the resistance of the material to be removed.
  • the hard metal tip according to the invention allows use on milling drums which do not provide this inclination. Without a position of the hard metal tip or the longitudinal axis of the bit relative to a plane perpendicular to the roll axis of rotation, the movement of the bit or the hard metal tip is parallel to the latter Turning or its central axis, so that the splitting process is optimal.
  • the required drive power of the milling machine can therefore be significantly reduced in comparison with known devices and the fuel consumption can be correspondingly greatly reduced with the same performance.
  • the use of the hard metal tip according to the invention therefore enables a particularly economical milling operation, on the one hand because of the greatly reduced by the "forced rotation" of the bit wear and on the other hand due to the reduced energy costs.
  • the guide surfaces on a hard metal tip according to the invention have a pitch angle of about 50 degrees. This allows a good powder metallurgy formability of the hard metal tip according to the invention.
  • a hard metal tip according to the invention has twelve guide surfaces arranged on its circumference. The hard metal tip according to the invention then has in each rotated about its longitudinal axis position good contact of the guide surfaces with the material to be removed.
  • each guide surface of a hard metal tip according to the invention is formed on a respective web with an essentially constant cross section starting from the tip to the foot region.
  • each guide surface of a hard metal tip according to the invention is also advantageous to form on a respective hump-like projection whose cross-section, starting from the tip to the foot region, increases substantially conically.
  • the powder metallurgical production is so much easier.
  • Such a projection on a hard metal tip according to the invention can be designed mirror-symmetrically with respect to a plane through the longitudinal axis.
  • the carbide tip according to the invention can then be used equally on two areas of a milling drum, if the round shank chisel in these areas are used inclined in opposite directions relative to a peripheral surface of the milling drum.
  • different carbide tips according to the invention can be used in such areas, which differ in opposite inclinations of the respective thread-like spiraling in order to achieve the same rotational behavior of the round-shank bits in both areas of such a milling drum.
  • the body of a hard metal tip according to the invention preferably has a cone angle of about 30 degrees of angle with respect to the longitudinal axis.
  • the hard metal tip according to the invention thus has a particularly good wear behavior.
  • the body of the hard metal tip according to the invention is made separately as a ring element and brazed to a cylindrical neck of a hard metal pin.
  • a round shank chisel is furthermore proposed, which has a carbide tip hard-soldered according to the invention with a base body.
  • Such a round shank chisel has the advantages described above.
  • powder-metallurgically produced carbide tip 1 according to the invention for a round shank chisel not shown is formed along its longitudinal axis 2, starting from a tip 3 via a body 4 to a foot portion 5 is substantially conical, so along this longitudinal axis 2 has a substantially continuously increasing cross-section.
  • the hard metal tip 1 is further formed radially symmetrical about the longitudinal axis 2 (also: rotationally symmetrical): a rotation of the hard metal tip 1 about the longitudinal axis 2 by an angle of 60 degrees brings them again with itself to cover.
  • the body 4 is conical and has a cone angle, ie an angle of the lateral surface 6 to the longitudinal axis 2 of 33.21 angle degree.
  • the hard metal tip 1 has six, relative to the body 4 raised, substantially planar guide surfaces 7, which are of the tip 3 to the foot portion 5 substantially parallel to each other helically wound around the longitudinal axis 2.
  • the term parallelism is to be understood in the present context, as in threads, as sectional parallelism of adjacent guide surfaces 7 or their imaginary continuations.
  • the guide surfaces 7 are inclined relative to the longitudinal axis 2 by about 45 degrees and each formed on a web 8 with starting from the top 3 to the foot region 5 substantially constant cross-section.
  • the second hard metal tip 9 according to the invention FIG. 2a differs from the first hard metal tip 1 according to FIG. 1 on the body 11 six identical hump-like projections 12 are formed, which also each have a mirror symmetry with respect to a plane, not shown by the longitudinal axis 13.
  • the total of twelve guide surfaces 10 are formed on these projections 12 and have an inclination relative to the longitudinal axis 13 of 37.5 angle degree.
  • the projections 12 have a height 14 of 4.4 mm in the direction of the longitudinal axis 13 and a width 15 of 4.8 mm in the circumferential direction of the hard metal tip 9.
  • the hard metal tip 9 in total has a height 16 of 17.2 mm and a diameter 17 of 18.68 mm, in the foot region 18 has a diameter 19 of 15.8 mm.
  • FIG. 2b shown separately manufactured by powder metallurgy ring member 20 has substantially the same concept as the second hard metal tip 9 according to FIG. 2a ,
  • the body 21 has a cone angle of 30 angular degrees, a height 22 of 4.6 mm in the direction of the longitudinal axis 23 and without the projections 24 has an outer diameter 25 of 20 mm.
  • the second hard metal tip 9 according to FIG. 2a and the ring member 20 according to FIG. 2b are not suitable for use with respect to a circumferential plane of a milling drum inclined longitudinal axis 23 due to the symmetrical projections 24.
  • FIG. 3a again differs from the second hard metal tip 9 according to FIG. 2a It essentially has six guide surfaces 27 formed on the projections 29 with an inclination relative to the longitudinal axis 30 of 45 degrees of angle. In contrast to the second hard metal tip 9, the latter is also suitable for use with inclined, as with a parallel to the circumferential plane longitudinal axis 30.
  • FIG. 3b shown separately manufactured by powder metallurgy second annular element 31 has corresponding to how the first ring member 20 according to FIG. 2b substantially the same concept as the third hard metal tip 26 according to FIG. 3a ,
  • FIG. 4 shows a Rundschaftm composeel 32 according to the invention, which has a brazed to a base body 33 fourth inventive carbide tip 34.
  • the hard metal tip 34 in turn consists of a cylindrical hard metal pin 35 with 12 mm diameter 36, which is brazed to a separately manufactured as a third ring member 37 body 38 to a not shown separately conical approach.
  • the third ring element 37 has on its circumference ten identical, slightly curved webs 39, each with a guide surface 40.
  • the webs 39 are inclined by 27 degrees of angle relative to the longitudinal axis 41 of the round shank chisel 32.
  • the ring element 37 has an outer diameter 42 of 19.6 mm and a height 43 of 5.2 mm.
  • the ring member 37 has an inner diameter 44 of 13 mm and - as well known from the prior art - depending on the application with carbide pins of 8 or 10 mm to a round shank bit 32 can be combined.
  • the in the FIGS. 5a to 5g shown carbide tip 45 is similar in geometry of its integrally formed ring member 46 of the embodiment according to FIG. 4 ,
  • a trapezoidal cross-section annular groove 49 is formed in the powder metallurgical production.
  • the top surface 51 is located with the base surface 48 in a plane.
  • the extension 50 has two parallel to the longitudinal axis 47 extending flat surfaces 52, which is to cause a Lotabl from the gap region on the surface of the extension 50 when soldering the carbide tip 45 with an upper end 52 of a drill collar 53.
  • an end face 54 of the drill collar 53 is provided with a blind bore 55 into which the extension 50 of the hard metal tip 45 is inserted.
  • the end of the chisel shaft 53 is also provided with a circumferential chamfer 56 on which a corresponding conical lateral surface 57 is supported as a wall of the trapezoidal annular groove 49.
  • the solder joint between the carbide tip 45 and the Chisel shaft 53 thus extends over the walls and the bottom of the annular groove 49 to a gap between the top surface 51 of the extension 50 and the bottom 57 of the blind bore 55.
  • a partially dome-shaped recess 58 is formed, which also can serve to accommodate unnecessary solder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Earth Drilling (AREA)
EP08002387A 2007-02-09 2008-02-11 Pointe en métal dur pour un pic à queue ronde Withdrawn EP1956186A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007007156A DE102007007156A1 (de) 2007-02-09 2007-02-09 Hartmetallspitze für einen Rundschaftmeißel

Publications (1)

Publication Number Publication Date
EP1956186A2 true EP1956186A2 (fr) 2008-08-13

Family

ID=39226724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08002387A Withdrawn EP1956186A2 (fr) 2007-02-09 2008-02-11 Pointe en métal dur pour un pic à queue ronde

Country Status (2)

Country Link
EP (1) EP1956186A2 (fr)
DE (1) DE102007007156A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108049295A (zh) * 2017-12-04 2018-05-18 苏州五元素机械制造有限公司 一种用于道路铣刨机的带柄凿刀
WO2018095955A1 (fr) * 2016-11-24 2018-05-31 POWER-TECHNOLOGIE GmbH Insert en métal dur pour un pic à tige ronde
USD863386S1 (en) 2018-06-06 2019-10-15 Kennametal Inc. Ribbed cutting insert
CN114592419A (zh) * 2015-08-06 2022-06-07 必泰克有限两合公司 切割装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010060453A1 (de) * 2010-11-09 2012-01-19 Gerd Elfgen Werkzeug zur spanenden Bearbeitung von Materialien

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3442546A1 (de) 1984-11-22 1986-05-28 Elfgen, Gerd, 5303 Bornheim Rundschaftmeissel fuer schraemmaschinen
US5324098A (en) 1992-12-17 1994-06-28 Kennametal Inc. Cutting tool having hard tip with lobes
DE19857451A1 (de) 1998-12-12 2000-06-15 Boart Hwf Gmbh Co Kg Schneid- oder Brechwerkzeug sowie Schneideinsatz für dieses

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131725A (en) * 1990-09-04 1992-07-21 Kennametal Inc. Rotatable cutting tool having an insert with flanges
US5873423A (en) * 1997-07-31 1999-02-23 Briese Industrial Technologies, Inc. Frustum cutting bit arrangement
US6341823B1 (en) * 2000-05-22 2002-01-29 The Sollami Company Rotatable cutting tool with notched radial fins

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3442546A1 (de) 1984-11-22 1986-05-28 Elfgen, Gerd, 5303 Bornheim Rundschaftmeissel fuer schraemmaschinen
US5324098A (en) 1992-12-17 1994-06-28 Kennametal Inc. Cutting tool having hard tip with lobes
DE19857451A1 (de) 1998-12-12 2000-06-15 Boart Hwf Gmbh Co Kg Schneid- oder Brechwerkzeug sowie Schneideinsatz für dieses

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114592419A (zh) * 2015-08-06 2022-06-07 必泰克有限两合公司 切割装置
WO2018095955A1 (fr) * 2016-11-24 2018-05-31 POWER-TECHNOLOGIE GmbH Insert en métal dur pour un pic à tige ronde
CN108049295A (zh) * 2017-12-04 2018-05-18 苏州五元素机械制造有限公司 一种用于道路铣刨机的带柄凿刀
USD863386S1 (en) 2018-06-06 2019-10-15 Kennametal Inc. Ribbed cutting insert

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Publication number Publication date
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