EP2406028A1 - Foret et outil de perçage muni d'un foret - Google Patents

Foret et outil de perçage muni d'un foret

Info

Publication number
EP2406028A1
EP2406028A1 EP10706922A EP10706922A EP2406028A1 EP 2406028 A1 EP2406028 A1 EP 2406028A1 EP 10706922 A EP10706922 A EP 10706922A EP 10706922 A EP10706922 A EP 10706922A EP 2406028 A1 EP2406028 A1 EP 2406028A1
Authority
EP
European Patent Office
Prior art keywords
drill bit
drill
drilling tool
cutting
rotation
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Withdrawn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
EP10706922A
Other languages
German (de)
English (en)
Inventor
Jürgen SCHWÄGERL
Herbert Rudolf Kauper
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.)
Kennametal Inc
Original Assignee
Kennametal Inc
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 Kennametal Inc filed Critical Kennametal Inc
Publication of EP2406028A1 publication Critical patent/EP2406028A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/02—Connections between shanks and removable cutting heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B23B2251/043—Helix angles
    • B23B2251/046—Variable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/08—Side or plan views of cutting edges
    • B23B2251/085—Discontinuous or interrupted cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/28—Arrangement of teeth
    • B23B2251/282—Unequal spacing of cutting edges in the circumferential direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B23B2251/408—Spiral grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/44—Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
    • B23B2251/446—Drills with variable margins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/70—Drills with vibration suppressing means
    • 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
    • Y10T408/892—Tool or Tool with support with work-engaging structure detachable from cutting edge
    • 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

Definitions

  • the invention relates to a drill bit according to the preamble of claim 1 and a drilling tool with such a drill bit.
  • a drill bit according to the preamble of claim 1 can be taken for example from DE 10 2006 025 294 A1.
  • a drilling tool is described with a special asymmetric design.
  • the drill bit of this drill has two main cutting edges, which - unlike a symmetrical design - are not rotationally symmetrical with respect to a 180 ° rotation about the axis of rotation of the drilling tool.
  • the main cutting edges extend to a cutting edge, which is followed by a secondary cutting edge, which runs along a flute.
  • an additional Stützfase is formed on the back of the drill. With the Stauerfase the drilling tool is supported on the bore wall.
  • the invention has for its object to provide a drilling tool that is easy to manufacture and in which the rattling is avoided as possible.
  • the object is achieved with a drill bit with the features of claim 1 and by a drilling tool with such a drill bit.
  • the drill bit comprises a fluted base extending in the axial direction along a rotation axis.
  • the main body has a front end face on which at least two main cutting edges are provided. These run in the radial direction outwards to a cutting edge.
  • the drill tip is formed asymmetrically in the cutting area and thus in particular in a cross section at the level of the cutting corners. At the same time, it is provided that this asymmetric configuration merges in the axial direction into a symmetrical configuration and preferably also remains symmetrical for the remaining axial length of the drilling tool.
  • an asymmetrical design with respect to the rotation about the axis of rotation is understood to mean that the drill tip deviates from a rotational symmetry.
  • the drill tip deviates from a 180 ° rotational symmetry and, in the case of an embodiment with three main cutting edges, from a 120 ° rotational symmetry, etc.
  • the drill bit tip can be made asymmetrical with respect to a plurality of asymmetry features. Preferably, but not necessarily, all asymmetry features go into a symmetrical configuration. over.
  • the transition to the symmetrical design therefore generally refers to at least one asymmetry feature.
  • the main cutting edges of the drill bit are usually connected to each other via a so-called cross cutting edge, which forms the foremost tip of the drill bit tip on the axis of rotation.
  • the main cutting edges extend in the radial direction to the outside.
  • the radial outward direction is generally understood to mean that the main cutting edges extend from the drill center or the transverse cutting edge to the outer circumference of the main body.
  • the main cutting edges do not run along a straight line but rather are curved.
  • the main cutting edges are followed by a main relief surface, which merges into a flute.
  • the main free surfaces are usually formed in the manner of conical surface and the entire drill bit is cone-like.
  • the particular advantage of the special design with the transition from the frontal asymmetry to the spaced apart in the axial direction of the front symmetric configuration is the fact that the asymmetry is limited to a shortest possible area of the entire drilling tool, the drilling tool then to the asymmetric Region is thus formed symmetrically.
  • asymmetric production deviating from the symmetrical design is required only in the region of the drill tip.
  • For the rest of the drill body can therefore be resorted to conventional symmetrical machining process for the production of the drilling tool.
  • a uniform chip flow is ensured by the symmetry in the axially rearward region. This is particularly advantageous for long drills.
  • Such drilling tools are used in industrial production for the production of high-precision boreholes. For this purpose, they are clamped with a shaft in a receptacle of a machine tool that can be programmed, for example, in view of the desired speed and the desired feed and automatically performs the drilling process.
  • a preferred asymmetry feature is to be seen in that the angular distance of a cutting edge, or a main cutting edge at a defined radial distance from the axis of rotation, to the cutting edge leading in the direction of rotation or to the leading main cutting edge is different from the angular distance to the trailing cutting edge or the trailing cutting edge ie the cutting corners are not uniformly distributed around the circumference.
  • the secondary cutting edges have different inclinations in the transitional region from the symmetrical to the asymmetric configuration. Due to these different inclinations, therefore, the angular distance of the secondary cutting edges to each other changed.
  • inclination of the secondary cutting edge is here understood the angle that the Secondary cutting edge encloses a line extending in the axial direction and lying on the circumferential line of the drilling tool. Since the secondary cutting edge also forms the rear edge of a flute, based on the direction of rotation, a swirl angle of the flutes is also determined via the secondary cutting edge. As a result, the helix angle of the flutes also changes in the transition region.
  • the flutes at the level of the cutting corners on an asymmetrical configuration which then merges in the axial direction in a symmetrical configuration.
  • This is of particular advantage in particular in the case of (nodular drilling tools, since this ensures that the flutes of the exchangeable drill tip part, in particular, are aligned with the flutes of the drill body, so that no interfering edges, etc. are formed.
  • the flutes also have the same cross-sectional areas in the asymmetrical region, that is, the space available for the removal of the chips in both flutes is at least substantially the same. Due to the asymmetry of the cross-sectional areas in the asymmetric region, therefore, for example, a larger width of a chip flute is compensated by a smaller depth.
  • the main free surfaces which adjoin the respective main cutting edge, are symmetrical to one another at their rear end to the extent that the rearward ends of the main relief surfaces have the same angular distance from one another, ie are arranged in an equally distributed manner.
  • the rear end is understood here to be the end of the main free surface facing away from the associated main cutting edge, at which point it merges into an associated chip flute. Therefore, preferably only the cutting corners or the main cutting edges are arranged unevenly distributed. Insbesonde- In the design of the drill tip as an exchangeable module part, it is achieved that the receptacle for fastening the drill tip can be designed symmetrically.
  • the asymmetric configuration merges continuously and in particular uniformly, namely without kinks and edges, into the symmetrical configuration.
  • This uniform course ensures, in particular, safe chip removal.
  • this is also relatively easy to design in terms of manufacturing technology.
  • the drill bit tip is formed as an exchangeable module part intended for insertion into a drill bit body of a modular drilling tool.
  • provision is made in particular for the symmetrical design to be achieved at the axially rear end of the exchangeable module part, in particular at its rear end face. This ensures that the asymmetrically formed at the front end of the drill bit can be used in a symmetrically shaped drill body.
  • the axial length of the transition region, in which the symmetrical configuration merges into the asymmetrical configuration is preferably less than or equal to a functional axial length of the exchangeable bit tip part in the case of an exchangeable tip part.
  • the term "functional axial length” is understood to mean, in particular, the length up to which the functional surfaces of the flute of the drill bit acting on the chip removal pass into the assigned areas of the flutes of the drill body or the length at which the minor cutting edges of the drill point fit into the associated secondary cutters of the drill body pass.
  • the actual axial extent of the drill bit may exceed this functional axial length, for example due to mounting pins, etc.
  • the axial length of the transition region is preferably 0.5 to 5 times the nominal diameter of the solid tool.
  • the axial length of the transition region is usually about 0.5 to 1 times the nominal diameter of the drill bit.
  • Fig. 1 is a plan view of the front end face as a replaceable
  • FIG. 2 is a plan view of the rear, rear end side of the drill bit according to FIG. 1, FIG.
  • FIGS. 1 and 2 are a side view of the drill bit according to FIGS. 1 and 2,
  • Fig. 4A, B, C are sectional views through the drill bit of Fig. 1 to 3 according to the
  • FIG. 5 is a fragmentary perspective view of a modular
  • the drill bit 2 according to FIGS. 1 to 3 is designed as an exchangeable module part, which can be inserted into a drill body 4, as shown in FIG. 5, and forms a drilling tool 5 with it.
  • the drill bit 2 is integrally formed in the embodiment and has a special shaped base 6 on. It is thus formed by this base body 6.
  • the drill tip 2 has an axis of rotation 8, which at the same time is the axis of rotation about which the entire drilling tool 5 rotates in the direction of rotation 10.
  • the drill tip 2 has at its front end face a transverse cutting edge 12 which crosses the axis of rotation 8 and in each case merges into a main cutting edge 14A.B, which extend in the radial direction outwards and terminate at a cutting edge 16A, B.
  • a respective secondary cutting edge 18A.B. runs along a drill back 17A, B.
  • the cross-cutting edge 12 is formed in the embodiment in an approximately S-shaped and the main cutting edges 14A.B take an arcuate course.
  • the main cutting edges 14A 1 B fall toward the cutting edge 16A, B in the axial direction, so that the end face of the drill tip 2 is designed to be conical overall.
  • Each of the main cutting edges 14A.B is followed by a main relief surface 19A, B, which extends to a rear end 20A, B, where it then merges into a flute 22A.B.
  • the flutes 22A, B are formed coiled in the embodiment.
  • notches 24, which serve as engagement surfaces for an assembly tool for inserting or removing the drill bit tip 2 from the drill bit body 4 are worked into the main clearance surfaces 19A.
  • the drill bit 2 has a stepped geometry and comprises a mounting pin 25 and additionally a centering pin 26 with respect to the mounting pin 25 reduced diameter.
  • the flutes 22A, B are guided by a head portion having the front end face up into the fastening pin 25, so that this seen in cross section is circular with the flute 22A.B forming trough-like recesses formed.
  • the mounting pin 25 At the bottom of the head part is a designated as a rear end surface 27, the mounting pin 25 radially projecting support surface formed.
  • this rear end face 27 extends perpendicular to the axis of rotation 8. With this end face 27, the drill bit 2 lies in the installed state on a corresponding bearing surface of the drill bit body 4, as can be seen from FIG.
  • the drill bit 2 which has an asymmetrical configuration in the region of its front end with respect to a rotation through 180 ° about the axis of rotation 8, wherein at the same time in the further course in the axial direction, the drill bit 2 has a symmetrical configuration.
  • dashed lines are shown in Figs. 1, 2 and 4A to 4C.
  • the two cutting corners 16A.B are arranged distributed unevenly over the circumference that their angular distance from each other therefore is different.
  • the difference of the angular distance is here for example in the range of about 20 °, ie the angular distance between the two cutting corners 16A 1 B is on the one hand about 190 ° and on the other hand about 170 °.
  • the flutes 22A.B are formed asymmetrically.
  • the drill bit 2 has further asymmetry features.
  • a guide bevel 28 extending on the drill back 17A 1 B, ie on the outer circumference of the base body 6, is provided adjacent to the respective secondary cutting edge 18A.B.
  • a support bevel 30 is provided on the drill back 17A in addition to the guide bevel 28, this is not formed on the drill back 17B associated with the second main cutting edge 14B.
  • the Stauerfase 30 has the same or almost the same outer diameter as theticiansfase 28.
  • a clearance is formed instead of the support chamfer 30.
  • a clearance is also formed between the guide chamfer 28 and the chamfer 30.
  • the rearward ends 20A.B of the main relief surfaces 19A.B, particularly on the outer circumferential line, are rotationally symmetrical with each other so far that the rearward ends 20A.B are the same angular distance from each other exhibit.
  • the opening angle of the two flutes 22A.B, ie the angular distance between the respective cutting edge 16A 1 B and the respective associated rearward arranged on the outer circumference end 20A.B is different.
  • the asymmetry with respect to the position of the cutting corners 16A 1 B and the flutes 22A.B is returned in the transition region 32 to a symmetrical configuration.
  • the transition region 32 is shown in Fig. 3 and extends in the axial direction from the respective cutting edge 16A 1 B to the rear end face 27.
  • the length of this transition region 32 is in this case approximately in the range between 20 and 40% of the nominal diameter D of the drill bit 2 ( see Fig. 1).
  • a symmetrical configuration is already reached at the end of the transitional region 32.
  • the minor cutting edges 18A 1 B are already rotationally symmetrical (at 180 °) to each other again at this point.
  • the cross-sectional geometry of the flutes 22A, B is symmetrical.
  • the supporting chamfer 30, in contrast, remains - as can be seen in particular from FIG. 5 - up to the rear end face 27, ie, to the end of the drill bit tip 2.
  • this is in particular the configuration of the flutes 22A 1 B and the angular spacing of the secondary cutting edges. the 18A 1 B to each other.
  • a complete symmetry is formed.
  • the support bevel 30 thus does not go over uniformly but abruptly into the drill body 4.
  • the modular drilling tool 5 is shown in the assembled state.
  • the drill bit 2 is clamped between two opposite, axially extending legs 34.
  • the legs 34 have a contact surface 36, which is formed obliquely inclined.
  • the leg 34 engages quasi in the respective main free surface 19 A, B, the drill bit 2 therefore does not cover the legs 34.
  • the end face of the legs 34 therefore forms a continuation of the main flats 19A.B.
  • the symmetrical configuration is already present at the end face of the drill bit tip 2 in the area of the rearward end 2OA, B of the main flank surfaces 19A.B.
  • the drill body 4 is completely rotationally symmetrical.
  • the secondary cutting edges 18A.B of the drill bit 2 preferably merge into corresponding secondary cutting edges 4OA (only one can be seen) of the drill body 4.
  • the flutes 42A of the drill body are helically formed in the embodiment. Alternatively, they can also run straight.
  • cooling channels 44 are incorporated into the drill body 4. These occur here within the respective flute 42A of the drill body 4 slightly spaced from the drill bit 2.
  • the opening of the cooling channel 44 in the respective flute 42A is in this case oriented such that it - in an imaginary projection in the axial direction - partially, in particular half, of the associated main cutting edge 14A 1 B is covered.
  • the outlet openings of the cooling channels 44 are therefore aligned with these main cutting edges 14A, B.
  • the drilling tool 5 is used to produce high-precision boreholes with the best possible surface quality of the bore wall. Due to the asymmetry features a chatter-free drilling is achieved even in deep boreholes.
  • the drill bit is for example made of hard metal or of a sintered material.
  • the drill body 4 is made, for example, from a HSS steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un foret (2) comprenant un corps de base (6) muni de goujures (22A,B), qui s'étend dans la direction axiale le long d'un axe de rotation (8) et dont la face frontale avant présente au moins deux lames principales (14A,B) qui s'étendent dans la direction radiale vers l'extérieur par rapport à un coin de coupe (16A, B). Le corps de base, vu en section transversale, présente une asymétrie au niveau des coins de coupe (16A,B) par rapport à une rotation autour de l'axe de rotation (8). Simultanément, la section transversale du corps de base est configurée de manière symétrique à une certaine distance des lames principales (14A,B). Le foret (2) se présente en particulier sous la forme d'une partie modulaire échangeable d'un outil de perçage (5) modulaire. Un corps de base de perçage (4), dans lequel peut être inséré le foret (2), peut ainsi lui-même être réalisé de manière symétrique.
EP10706922A 2009-03-11 2010-02-12 Foret et outil de perçage muni d'un foret Withdrawn EP2406028A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009012725.9A DE102009012725B4 (de) 2009-03-11 2009-03-11 Bohrerspitze sowie Bohrwerkzeug mit einer Bohrerspitze
PCT/EP2010/000877 WO2010102705A1 (fr) 2009-03-11 2010-02-12 Foret et outil de perçage muni d'un foret

Publications (1)

Publication Number Publication Date
EP2406028A1 true EP2406028A1 (fr) 2012-01-18

Family

ID=42035830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10706922A Withdrawn EP2406028A1 (fr) 2009-03-11 2010-02-12 Foret et outil de perçage muni d'un foret

Country Status (9)

Country Link
US (1) US10086444B2 (fr)
EP (1) EP2406028A1 (fr)
JP (1) JP5651607B2 (fr)
KR (1) KR20110125268A (fr)
CN (1) CN102348523B (fr)
BR (1) BRPI1009334A2 (fr)
CA (1) CA2753802A1 (fr)
DE (1) DE102009012725B4 (fr)
WO (1) WO2010102705A1 (fr)

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DE102013205889B3 (de) 2013-04-03 2014-05-28 Kennametal Inc. Kupplungsteil, insbesondere Schneidkopf für ein Rotationswerkzeug sowie ein derartiges Rotationswerkzeug
DE102013206549A1 (de) * 2013-04-12 2014-10-16 Kennametal Inc. Werkzeugkopf, insbesondere Bohrkopf
JP6122487B2 (ja) 2013-04-26 2017-04-26 京セラ株式会社 ドリルおよびそれを用いた切削加工物の製造方法
DE102013209371B4 (de) 2013-05-21 2021-04-29 Kennametal Inc. Kupplungsteil, insbesondere Schneidkopf für ein Rotationswerkzeug sowie hierzu komplementäres Kupplungsteil und Rotationswerkzeug
DE102013220884B4 (de) * 2013-10-15 2022-02-17 Kennametal Inc. Modulares Trägerwerkzeug sowie Werkzeugkopf
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CN107081457B (zh) * 2017-06-29 2023-06-16 成都锋宜精密工具制造有限公司 高稳定性自定心钻头钻尖
EP3427876B1 (fr) * 2017-07-10 2022-06-22 Sandvik Intellectual Property AB Insert de coupe rotatif et outil comportant un élément de blocage axial
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CA2753802A1 (fr) 2010-09-16
DE102009012725B4 (de) 2020-10-15
JP5651607B2 (ja) 2015-01-14
DE102009012725A1 (de) 2010-09-16
US20110318128A1 (en) 2011-12-29
WO2010102705A1 (fr) 2010-09-16
KR20110125268A (ko) 2011-11-18
CN102348523A (zh) 2012-02-08
BRPI1009334A2 (pt) 2016-03-08
CN102348523B (zh) 2014-04-30
US10086444B2 (en) 2018-10-02
JP2012519602A (ja) 2012-08-30

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