US20110188956A1 - Coated twist drill - Google Patents

Coated twist drill Download PDF

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Publication number
US20110188956A1
US20110188956A1 US12/310,681 US31068107A US2011188956A1 US 20110188956 A1 US20110188956 A1 US 20110188956A1 US 31068107 A US31068107 A US 31068107A US 2011188956 A1 US2011188956 A1 US 2011188956A1
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US
United States
Prior art keywords
drill
layer
set forth
tip
coating
Prior art date
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Abandoned
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US12/310,681
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English (en)
Inventor
Peter Mueller
Thomas Schneider
Thomas Heil
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Walter AG
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Individual
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Filing date
Publication date
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Assigned to WALTER AG reassignment WALTER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHNEIDER, THOMAS, HEIL, THOMAS, MUELLER, PETER
Publication of US20110188956A1 publication Critical patent/US20110188956A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B23P15/32—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/044—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material coatings specially adapted for cutting tools or wear applications
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/40—Coatings including alternating layers following a pattern, a periodic or defined repetition
    • C23C28/42—Coatings including alternating layers following a pattern, a periodic or defined repetition characterized by the composition of the alternating layers
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
    • B23B2224/24—Titanium aluminium nitride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
    • B23B2224/28—Titanium carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
    • B23B2224/32—Titanium carbide nitride (TiCN)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
    • B23B2224/36—Titanium nitride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2228/00—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner
    • B23B2228/10—Coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49986—Subsequent to metal working
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/27—Cutters, for shaping comprising tool of specific chemical composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/78—Tool of specific diverse material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the present invention concerns a twist drill having a shank and a cutting portion which is defined by the axial extent of flutes and which is at least partially coated.
  • the invention also concerns a process for the production of a corresponding twist drill.
  • Coated twist drills have long been known.
  • the coating can serve very different purposes.
  • the attempt is made to increase the resistance to wear of the drill, in particular in the region of the drill tip, by a corresponding coating.
  • the drill geometry or the specific uses mean that the round lands or guide lands or the peripheral surfaces of the drill are also stressed they can also be protected from premature wear by a complete coating on the cutting portion.
  • Other coatings which are generally restricted to the region of the tip of a drill, beside increasing the resistance to wear, are also intended in particular to influence the chip shape and to produce a chip which either breaks quickly or which rolls up very tightly and which can be transported by the chip flutes extending in a spiral configuration, more easily than long, less heavily curved chips. Chip transport is important in particular in relation to drills whose cutting portions are relatively great in comparison with the diameter (nominal diameter of the cutting portion), being for example more than six times the nominal diameter.
  • the coating on the chip flutes which it will be appreciated is at least partially dependent on whether the layer does or does not involve a surface treatment, for example by grinding, polishing or smoothing.
  • a coating on the flutes can additionally improve chip transport.
  • the drills involved here are metal drills, that is to say drills which are provided for working on metallic workpieces, in which respect however different metallic materials may also exhibit very different chip cutting characteristics.
  • titanium nitrite titanium nitrite
  • further layers have been developed on the basis of that layer, the further layers additionally containing for example carbon or aluminum such as for example (AlTi)N, (TiAl)N or Ti(CN).
  • titanium has also been replaced by chromium (as for example in the case of (CrAl)N), and coatings based on tungsten carbide (WC/C) have also been developed.
  • the cutting corner is undefined and the drill can only be limitedly used, it wears more rapidly and must be shortened until by chance a position which is not affected by the pitting is reached at both sides on the oppositely disposed round lands. It will be appreciated that this also reduces the useful working life of the drill.
  • the object of the present invention is to provide a twist drill having the features set forth in the opening part of this specification and a process for the production thereof, which on the one hand ensure very good properties in regard to service life and chip formation and chip transport, but which on the other hand are also highly suited for re-working, including subsequent coating on the other hand.
  • the cutting portion has a first coating substantially over the entire useable length of the cutting portion, wherein there is provided a second coating that is different from the first coating only at the tip of the drill and there includes a region which measured from the drill tip corresponds at a maximum to twice the nominal diameter of the drill.
  • the cutting portion can be provided substantially over its entire length with a high-performance layer which is possibly not yet optimum in terms of resistance to wear but in return is also not exposed to the danger of pitting or spalling of the layers.
  • a high-performance layer should afford a lower level of friction in relation to the chips.
  • An additional, particularly hard and wear-resistant layer can then possibly be applied to that layer, wherein the additional layer is however restricted to the tip of the drill and for that reason alone is not or is only immaterially affected by pitting and also does not adversely influence chip transport, by virtue of its short length. Pitting is avoided not only by virtue of the fact that the second layer extends only over a relatively short distance beyond the cutting edge, but also by virtue of the fact that in the proximity of the cutting edges the second layer is applied to the first layer and not directly to the base material of the drill, wherein, even if the second layer chips off the first layer in that region, at any event the first layer itself is not affected by that chipping.
  • the drill tip When working and re-grinding worn drills the drill tip is effectively shortened by a certain amount and removed to such a degree that all severely worn regions which are concentrated in particular around the main cutting edges disappear.
  • the second layer is typically of its greatest thickness at the end of the drill and/or around the main cutting edges and then becomes progressively thinner towards the shank end until it is reduced to zero at the latest approximately at twice the diameter, measured from the drill tip.
  • the thicker regions of the second layer are simultaneously removed with the removal of the drill tip so that the subsequent re-coating of the new tip with the second layer is effected on residues which are possibly still present of the second layer and the adjoining regions which are possibly not yet affected by the original second layer so that the result is a coated drill tip which is completely identical to the original drill tip.
  • the second layer is so selected that it can be restored without involving major complication and effort and without a complex process control.
  • the first layer which extends from the tip to the shank end of the cutting portion remains substantially preserved as the drill is shortened or removed essentially only at the particularly severely wearing tip with the main cutting edges so that the positive properties of the first layer in respect of chip transport, the avoidance of surface pickup phenomena and protection for the guide lands is also retained.
  • the present invention is applied to twist drills whose cutting portion is of an axial length of at least four times the diameter.
  • chip formation and chip transport play a lesser part so that it is possible substantially to concentrate on protection from wear, for which purpose it is generally possible to manage with a single layer although for particular situations of use the double layer according to the invention may nonetheless be appropriate in relation to short drills.
  • a particularly preferred twist drill according to the invention is one in which the cutting portion is at least six times its diameter.
  • the cutting portion is defined by the axial length of the chip flutes or that useable part which can be moved downwardly into a drilled hole without blocking chip discharge.
  • the second layer is limited in respect of its axial extent to between 0.3 and 1.5 times, in particular to between 0.3 and 1.2 times, the nominal diameter, measured in each case from the tip of the drill. It is possible to completely dispense with the first coating on the free clearance surfaces of the main cutting edges at the end of the drill, especially as when re-conditioning a worn drill that tip region is in any case completely ground away so that in the re-grinding operation and subsequent re-coating procedure with the second layer it is in any case only the second layer that is applied to the clearance surfaces at the end.
  • a particularly preferred twist drill according to the invention is one in which at least the cutting portion but preferably the entire drill including the shank is produced from solid hard metal.
  • solid hard metal drills which typically comprise a tungsten carbide-cobalt compound are in themselves already relatively wear-resistant, it is however nonetheless also possible by coatings in relation to solid hard metal drills, to still considerably improve the properties both in regard to resistance to wear and also in regard to chip formation and chip transport.
  • the first layer can have an advantageous effect in particular but not only in relation to solid hard metal drills, in regard to a whole series of properties.
  • many of the metallic elements which constitute the materials to be machined can diffuse into the WC—Co compound, which is also substantially metallic, of a solid hard metal drill.
  • elements can also diffuse out of the solid hard metal, and that respectively manifests itself in corresponding detrimental ageing effects.
  • the cutting edges when machining many metallic materials, there is a severe tendency for the chips to build up by a welding effect.
  • Ceramic layers of that kind have thermally insulating properties and finally they also contribute to a further wear resistance as they are generally even harder than the base material of the drill, even if the drill in turn comprises solid hard metal.
  • first and second coatings may certainly still differ in respect of layer thickness, variation in the layer thickness in dependence on the axial position and the surface nature, that is to say smooth or not smooth.
  • consideration is to be given in particular to the fact that, in a grinding or smoothing operation, in principle the cutting edges are also detrimentally affected so that it may be appropriate for the second layer in the proximity of the main cutting edges to be applied only after smoothing or grinding of the first layer and after grinding of the drill tip.
  • a particularly preferred configuration of the present invention is one in which the applied first and second layers are of different colors. In that way it is possible to clearly see how far the second layer extends over the tip of the drill, how far which layer is worn, and what type of drill is confronting the person handling it, as drills with different coatings can certainly be adapted to special, different machining operations or materials.
  • the color of the first complete layer also differs from the color of the base material. That also makes it easier to recognize any flaws or any wear phenomena on the first layer.
  • a particularly preferred embodiment of the invention is one in which the first layer is smoothed at least in the region of the chip flutes and in those chip flutes at least outside the region of the tip, which is covered by the second layer.
  • the coating applied to the round lands and the adjoining, relieved peripheral surfaces of the drill flute lands can also be selectively smoothed.
  • the drill tip can be left untouched in order not to cause wear of the main cutting edges from the outset due to the smoothing operation.
  • the tip grind and the coating operation with the second layer can be effected only after the step of smoothing the cutting part provided with the first layer and in particular the chip flutes.
  • a process according to the invention for the production of corresponding twist drills has the features:
  • a preferred process is one in which the first layer is smoothed at least in the chip flutes and in that respect at least outside the region affected by the second layer.
  • the guide lands and peripheral surfaces of the drill lands are also smoothed after application of the first layer. That smoothing operation is intended to reduce friction with the drilled hole walls and/or chips produced by the drill tip and in particular to promote chip transport.
  • smoothing can be limited to a region at a spacing from the main cutting edges, or the smoothing operation can be effected between foregoing steps (c) and (d).
  • FIG. 1 shows a side view of a twist drill according to the invention
  • FIG. 2 shows a section through the drill of FIG. 1 along line II-II in FIG. 1 ,
  • FIG. 3 shows a view along the axis 12 onto the end or tip 3 of the drill
  • FIG. 4 shows an enlarged side view of the tip and the adjoining region of the drill.
  • FIG. 1 shows a drill which is generally identified by reference 100 and which has a shank 10 and a cutting portion 1 .
  • the cutting portion 1 is characterized by chip flutes 2 extending from the drill tip 3 to close to the shank 10 .
  • the chip flutes extend in a spiral at a certain helical angle or twist angle around the axis 12 of the drill, wherein the twist angle of the chip flutes 2 , or more precisely the twist angle of the secondary cutting edges which are formed at the transition of the chip flutes 2 to the guide lands 6 , must be selected to be sufficiently large relative to the axis 12 in order to provide for effective chip transport from the tip 3 of the drill to the shank and out of the chip flutes.
  • twist angle is in the range of between 20° and 40° relative to the axis 12 .
  • the drill in accordance with the embodiment illustrated here has at its tip two slightly convexly curved cutting edges 5 and the transverse cutting edge bridging over the two main cutting edges 5 is substantially reduced in terms of a cutting edge.
  • the main cutting edges 5 are adjoined at the end of the drill by a clearance surface comprising a first bevel-like portion 4 a and a portion 4 b which is angled in relation thereto and at a larger fall angle. Coolant bores 11 can be seen at the end as shown in FIG. 3 of the drill (and also in FIGS. 2 and 4 ).
  • the diameter of the drill is defined by two oppositely disposed cutting corners 13 formed by the transition between the main cutting edges 5 and the secondary cutting edges 8 which extend along the periphery of the cutting portion in a helical configuration around the drill.
  • Adjoining the secondary cutting edges 8 are so-called “guide lands” or also “round lands” which are effectively clearance surfaces lying on a cylindrical surface, of the secondary cutting edges 8 , and which contribute to stabilizing and guiding the drill in a bore hole.
  • the peripheral surfaces 9 of the drill, adjoining the guide lands 6 are undercut in relation to the round lands 6 or reduced to a smaller diameter to reduce the friction of the drill in the bore hole.
  • FIG. 2 shows the drill in section along line II-II in FIG. 1 , and it is also possible to see here the coolant bores 11 as well as the flutes 2 and the bottom 2 a of the flutes 2 , the bottom being provided with the first layer.
  • the entire cutting portion 1 that is to say the portion from the drill tip 3 to the end of the flutes 2 , is coated with a first layer comprising a wear-resistant material which promotes chip transport.
  • the end clearance surfaces 4 a, b can be left untouched by the first layer so that they are only coated with the second layer.
  • the axial length of the portion 7 is preferably in the range of between 0.3 and 1.2 times the diameter and in the illustrated embodiment approximately corresponds to the diameter.
  • the first coating is smoothed above the region 7 of the second coating at least within the chip flutes. That can be effected for example by wet or dry blasting, by brushing or by magnet-abrasive removal.
  • the first and second layers comprise a different material so that the demands on their properties, which in principle are somewhat different, can also be suitably optimized.
  • the capabilities of producing the coatings also play a part.
  • the two coatings can also comprise the same material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Drilling Tools (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
US12/310,681 2006-09-06 2007-08-24 Coated twist drill Abandoned US20110188956A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006042226.0 2006-09-06
DE102006042226A DE102006042226A1 (de) 2006-09-06 2006-09-06 Beschichteter Spiralbohrer
PCT/EP2007/058806 WO2008028828A1 (fr) 2006-09-06 2007-08-24 Foret hélicoïdal revêtu

Publications (1)

Publication Number Publication Date
US20110188956A1 true US20110188956A1 (en) 2011-08-04

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Family Applications (2)

Application Number Title Priority Date Filing Date
US12/310,681 Abandoned US20110188956A1 (en) 2006-09-06 2007-08-24 Coated twist drill
US11/896,743 Expired - Fee Related US8043035B2 (en) 2006-09-06 2007-09-05 Coated drill and method of making the same

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/896,743 Expired - Fee Related US8043035B2 (en) 2006-09-06 2007-09-05 Coated drill and method of making the same

Country Status (8)

Country Link
US (2) US20110188956A1 (fr)
EP (2) EP2059362A1 (fr)
JP (1) JP5324446B2 (fr)
KR (1) KR101386292B1 (fr)
CN (2) CN101600531B (fr)
DE (1) DE102006042226A1 (fr)
IL (1) IL197254A0 (fr)
WO (2) WO2008028828A1 (fr)

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US20120009034A1 (en) * 2010-07-06 2012-01-12 Thomas Mack Drilling tool
US9403246B2 (en) 2010-02-04 2016-08-02 Kennametal Inc. Drill bit and method for manufacturing
US20160279747A1 (en) * 2011-11-15 2016-09-29 Kennametal Inc. Manufacturing of holemaking tools
US9901990B2 (en) 2010-02-04 2018-02-27 Kennametal Inc. Drilling tool
US20190105716A1 (en) * 2016-03-28 2019-04-11 Kyocera Corporation Rotary tool

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WO2007010601A1 (fr) * 2005-07-20 2007-01-25 Osg Corporation Perceuse
DE102007040178B4 (de) * 2007-08-25 2011-06-22 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG, 73431 Bohrer
DE102008004516B4 (de) * 2008-01-16 2015-02-12 Sergey Ventsel Schneidwerkzeug für Erzeugung hohlen Raums in festen Materialien
US8534391B2 (en) 2008-04-21 2013-09-17 Baker Hughes Incorporated Cutting elements and earth-boring tools having grading features
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IL197254A0 (en) 2009-12-24
EP2064363A1 (fr) 2009-06-03
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EP2064363B1 (fr) 2022-07-27
US8043035B2 (en) 2011-10-25

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