WO2015140781A1 - Foret ou tête de forage à bord de brunissage - Google Patents

Foret ou tête de forage à bord de brunissage Download PDF

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Publication number
WO2015140781A1
WO2015140781A1 PCT/IL2015/050201 IL2015050201W WO2015140781A1 WO 2015140781 A1 WO2015140781 A1 WO 2015140781A1 IL 2015050201 W IL2015050201 W IL 2015050201W WO 2015140781 A1 WO2015140781 A1 WO 2015140781A1
Authority
WO
WIPO (PCT)
Prior art keywords
margin
drill
cutting
extremity
cutting diameter
Prior art date
Application number
PCT/IL2015/050201
Other languages
English (en)
Inventor
Eitan Gonen
Anatoly YANOVSKI
Original Assignee
Iscar Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US14/219,893 external-priority patent/US20150266107A1/en
Application filed by Iscar Ltd. filed Critical Iscar Ltd.
Priority to US15/127,094 priority Critical patent/US10005136B2/en
Publication of WO2015140781A1 publication Critical patent/WO2015140781A1/fr
Priority to IL247046A priority patent/IL247046B/en

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
    • B23B2220/00—Details of turning, boring or drilling processes
    • B23B2220/24—Finishing
    • 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
    • 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

Definitions

  • the subject matter of the present application relates to drill margins, in particular drill margins of drills and drill heads configured for drilling ductile materials such as low carbon steel and alloy steel.
  • One measurement of drilling quality is the finish provided to workpiece.
  • Providing a high-quality finish on ductile materials, such as low carbon steel or alloy steel, can be particularly challenging, and improved finish is often a desired result.
  • US 8,419,322 discloses tool for use in a preformed round hole. More precisely it discloses a cutting insert with a minor edge cutting flank adjoining a minor cutting edge against a direction of rotation, and comprising a support element arranged at a distance from the major cutting edge against a feed direction.
  • the support element has a radius of revolution larger than a pitch circle radius of the cutting insert, during a drilling operation.
  • the support element is mentioned as being able to provide both a supporting function and a smoothing function.
  • drills of the present application are configured for only axially machining (i.e. drilling) and are not configured for machining in a non-axial direction (e.g. shouldering, ramping). More specifically, drills according to the present application are configured only for drilling holes of diameter corresponding to a cutting diameter of the tool. Nonetheless, the term "drill” is inclusive of drills configured to rotate and static drills configured to be static while a work piece is rotated.
  • a drill or drill head having a central axis Ac defining a front-to-rear direction and comprising: a plurality of cutting portions; each cutting portion comprising: a rake surface; a relief surface; a cutting edge formed at an intersection of the rake and relief surfaces and extending rearwardly to a cutting edge extremity defining a cutting diameter of the drill; and a margin extending rearwardly from the relief surface and also extending from the rake surface; wherein each margin comprises a margin extremity adjacent to the relief surface and located outside of the cutting diameter.
  • the margin and more particularly the margin extremity, has been found to provide a burnishing function, and test results received thus far have surprisingly found that longevity of a drill or drill head with such margin extremity is apparently increased over comparative tools.
  • a drill or drill head comprising a cutting portion; the cutting portion comprising a drill margin; the drill margin comprising a margin extremity adjacent to a relief surface and located outside of a cutting diameter.
  • a drill or drill head can have a central axis Ac defining a front-to-rear direction.
  • a drill or drill head can by rotationally symmetric about the central axis Ac.
  • Cutting edge extremities of a drill or drill head can be equally circumferentially spaced about the central axis Ac-
  • Margins of a drill or drill head can be equally circumferentially spaced about the central axis Ac-
  • a drill or drill head can comprise a plurality of cutting portions.
  • a cutting portion can comprise a rake surface, a relief surface, and a cutting edge formed at an intersection of the rake and relief surfaces.
  • a cutting edge can extend rearwardly to a cutting edge extremity defining a cutting diameter of the drill or drill head.
  • a cutting edge can be configured for drilling ductile materials such as low carbon steel and alloy steel.
  • a cutting edge can have a rake angle ⁇ , at a cutting edge extremity, of twenty to thirty degrees (20° ⁇ ⁇ ⁇ 30°).
  • a cutting portion can comprise a margin extending rearwardly from a relief surface and also extending from a rake surface.
  • a margin can comprise a margin extremity adjacent to a relief surface and located outside of the cutting diameter. Stated differently, a margin extremity is located further from a central axis Ac than a cutting edge extremity. Stated differently yet, a margin extremity constitutes a furthermost point from the central axis Ac.
  • a margin can extend outside of a cutting diameter beginning from a cutting edge extremity.
  • a margin can extend outside of the cutting diameter beginning from the cutting edge extremity, and continuously increase distance from the cutting diameter until a margin extremity.
  • the continuous increase in distance can be at a decreasing rate (i.e. having a convexly-curved shape in a top view thereof).
  • a cutting portion can comprise a margin edge extending along an intersection of a margin and a rake surface.
  • a margin, at each axial location along the margin edge can comprise an extremity extending outside of a cutting diameter.
  • a margin, at each axial location along the margin edge can extend outside of the cutting diameter beginning from the margin edge.
  • a margin, at each axial location along the margin edge can continuously increase distance from the cutting diameter until an extremity. The continuous increase in distance can be at a decreasing rate (i.e. having a convexly-curved shape in a top view thereof).
  • a margin extremity can extend outside of a cutting diameter by a protrusion distance Dp of at least one micron (Dp > 0.001 mm).
  • a protrusion distance Dp was two to eight microns (0.002 mm ⁇ Dp ⁇ 0.008 mm) outside of the cutting diameter Dc-
  • a preferred tested protrusion distance Dp was three to ten microns (0.003 mm ⁇ Dp ⁇ 0.010 mm) outside of the cutting diameter Dc-
  • a preferred protrusion distance Dp may be one to six microns (0.001 mm ⁇ Dp ⁇ 0.006 mm).
  • a preferred protrusion distance Dp may be four to twelve microns (0.004 mm ⁇ Dp ⁇ 0.012 mm).
  • a preferred range of protrusion distances Dp would be one to twelve microns (0.001 mm ⁇ Dp ⁇ 0.012 mm).
  • a most preferred tested range of protrusion distances Dp is two to ten microns (0.002 mm ⁇ Dp ⁇ 0.010 mm).
  • a margin extremity extending outside of a cutting diameter by a protrusion distance Dp of at least two microns has found to have better performance than at least one micron (Dp > 0.001 mm).
  • a margin, at each axial location can comprise an extremity extending outside of the cutting diameter by a protrusion distance Dp corresponding to the values above mentioned in connection with the margin extremity.
  • An entire margin can be located outside of the cutting diameter.
  • a margin can extend an axial distance no greater than 0.1mm from a relief surface, preferably no greater than 0.01mm from the relief surface.
  • a margin can comprise a margin portion.
  • the margin portion can be the only portion of the margin comprising an extremity located outside of the cutting diameter.
  • the margin portion can extend an axial distance no greater than 0.1mm from a relief surface, preferably no greater than 0.01mm from the relief surface.
  • Each cutting portion or margin of a drill or drill head (i.e. all cutting portions or all margins) can have one or more of the features detailed above.
  • a margin width W M measured from the cutting edge extremity 24 to the flank surface 42 can be between 5% to 10% of the cutting diameter D c (0.05D C ⁇ W M ⁇ 0.10 D c ). With a range of 6% ⁇ 1 % having been successfully tested.
  • Fig. 1A is a side view of a drill in accordance with an embodiment of the subject matter of the present application
  • Fig. IB is a front end view or top view of the drill in Fig. 1A;
  • Fig. 2A is a perspective side view of a drill head of the drill in Figs. 1A and IB;
  • Fig. 2B is a first side view of the drill head in Fig. 2A;
  • Fig. 2C is a second side view of the drill head in Fig. 2A, rotated 90° from the view shown in Fig. 2B ;
  • Fig. 3 is an enlarged view of the encircled portion of the drill head in Fig. 2C;
  • Fig. 4 is a front end view or top view of the drill head shown in Fig. 2A;
  • Fig. 5A is a schematic view of a prior art design, which could be found in a region of a prior art tool corresponding to the region encircled in Fig. 4;
  • Fig. 5B is a schematic view of another prior art design, which could be found in a region of a prior art tool corresponding to the region encircled in Fig. 4;
  • Fig. 5C is a schematic view of the region encircled in Fig. 4.
  • FIG. 1A and IB illustrating a drill 10 according to the subject matter of the present application.
  • the drill 10 can comprise a drill body 12 and a drill head 14 configured to be mounted to the drill body 12.
  • the drill 10 is for metal cutting operations and the drill head 14 is typically made of extremely hard and wear-resistant material such as cemented carbide, either by form-pressing and then sintering carbide powders in a binder or by powder injection molding methods.
  • extremely hard and wear-resistant material such as cemented carbide, either by form-pressing and then sintering carbide powders in a binder or by powder injection molding methods.
  • a central axis Ac about which the drill 10 is configured to rotate in a rotation direction DR, extends through the center of the drill body 12 and drill head 14 and can define a front-to- rear direction DFR.
  • the drill head 14 comprises a plurality of cutting portions 16 located rearward of a chisel 17 of the drill head 14.
  • Each cutting portion 16 comprises a rake surface 18, a relief surface 20 and a cutting edge 22 formed at an intersection of the rake and relief surfaces 18, 20.
  • the cutting edge 22 can extend rearwardly from the chisel 17 to a cutting edge extremity 24 which defines a cutting diameter Do It will be understood from the drawings that use of the words “rearward” or “rearwardly” is not to be construed as strictly parallel with central axis Ac in the front-to-rear direction D FR .
  • the rake surface 16 is configured for chips (not shown) from a workpiece (not shown) to flow thereover.
  • a rake angle ⁇ is shown, schematically, at the cutting edge extremity 24.
  • the relief surface 18 can form an internal acute angle ⁇ , shown schematically, with the rake surface 16 to provide relief during drilling.
  • the cutting edge 22 can comprise two cutting edge portions.
  • the cutting edge 22 can comprise a minor cutting edge portion 22A extending rearwardly from the chisel 17, and a major cutting edge portion 22B extending from the minor cutting edge portion 22A to the cutting edge extremity 24.
  • the minor cutting edge portion 22A is also shown to extend radially, whereas the major cutting edge portion 22B can form an internal obtuse angle a therewith.
  • the minor cutting edge portions 22A are preferably one third to one quarter of the length of the major cutting edges 22B.
  • the drill head 14 comprises a plurality of margins 26.
  • the margins 26 are identical (as are the cutting portions 16) and therefore further reference will only be made to one of the margins 26.
  • the margin 26, at least adjacent to the relief surface 20, comprises a margin extremity 28 located outside of the cutting diameter Dc which constitutes a furthermost point of the margin 26 from the central axis Ac .
  • FIG. 5A Drawing attention to Figs. 5 A and 5B, prior art constructions are shown for aiding understanding of the subject matter of the present application.
  • Each prior art drill 10A, 10B comprises a cutting diameter D CA , D CB , a cutting edge extremity 24A, 24B, a margin 26A, 26B and a margin extremity 28A, 28B.
  • the prior art drill 10A in Fig. 5A is designed for the margin 26A thereof to extend along the cutting diameter D CA , and consequently the margin extremity 28A thereof also coincides with the cutting diameter D CA -
  • the margin 26B is designed for the margin 26B thereof to extend within the cutting diameter DCB, and consequently the margin extremity 28B thereof is located within the cutting diameter DCB- [0027]
  • the margin 26 can extend outside of the cutting diameter Dc from beginning from a cutting edge extremity 24.
  • the margin is already outside of the cutting diameter Dc .
  • the margin 26, particularly the margin extremity 28, can extend a protrusion distance
  • drills of diameters smaller than eight millimeters and larger than twenty five millimeters can also be manufactured. Even though testing of further diameters has not yet been carried out, according to the principle of extrapolation based on the test results above, it is believed that drills with a cutting diameter Dc of less than eight millimeters may have a preferred protrusion distance Dp of one to six microns (0.001 mm ⁇ Dp ⁇ 0.006 mm). Similarly, based on extrapolation, drills with a cutting diameter Dc greater than twenty five millimeters may have a preferred protrusion distance Dp of four to twelve microns (0.004 mm ⁇ Dp ⁇ 0.012 mm).
  • a preferred extrapolated range of protrusion distances Dp would be one to twelve microns (0.001 mm ⁇ Dp ⁇ 0.012 mm). Nonetheless, it is noted that a maximum upper limit of the protrusion distance Dp at which this concept no longer works has not yet been found. Notwithstanding the above-said, it is also noted that a margin extremity extending outside of a cutting diameter by a protrusion distance Dp of at least two microns (Dp > 0.002 mm) has found to have better performance than at least one micron (Dp > 0.001 mm).
  • the successfully tested range is a protrusion distance Dp of two to ten microns (0.002 mm ⁇ Dp ⁇ 0.010 mm), with even more preferred diameter-specific ranges being those described above.
  • the margin 26 can have a convexly-curved shape (i.e. it continuously extends outside of the cutting diameter Dc at a decreasing rate).
  • the margin extremity 28 can be located in a margin portion 32 of the margin 26.
  • the margin portion 32 extends between an upper limit 33 at an intersection of the relief surface 20 and the margin 26, to an imaginary lower limit 34 (located at an axial distance D A of 0.01mm to 0.1mm from the relief surface 20, or more precisely from the upper limit 33). It will be understood that due to the receding nature of the margin 26, as perhaps understood best from Figs. 2C and 3, engagement of the drill head 14 and a hole being drilled (not shown) is only configured to extend to the imaginary lower limit 34. Stated differently, the margin portion 32 can be the only portion of the margin 26 configured to contact a hole (not shown), however it will be understood that due to tolerances additional portions of the margin 26 may contact the hole.
  • the entire margin 26 could be constituted entirely by the area shown as the margin portion 32.
  • the cutting portion 16 could extend radially inwardly at axial positions lower than the margin portion 32 (not shown).
  • the margin 26 comprises a margin edge 36 extending along an intersection of the margin 26 and the rake surface 18.
  • the margin 26, as shown in Figs. 2C and 3, can be formed with a receding geometry.
  • the margin 26 has a similar shape to the shape the margin portion 32, and as shown in Figs. 3 and 5C.
  • the margin 26 extends from the margin edge 36 to the margin extremity 28.
  • the margin extremity 28 can be located at an intersection of a flank surface 42 and the margin 26.
  • a margin width W M measured from the cutting edge extremity 24 to the flank surface 42 can be between 5% to 10% of the cutting diameter D c (0.05D C ⁇ W M ⁇ 0.10 D c ).
  • the flank surface 42 can extend inward to the drill head 14. In any case, as shown in Fig. 5C, the flank surface 42 extends from a position outside of the cutting diameter Dc to a position within the cutting diameter Dc- Stated differently, the flank surface 42 is configured to provide a relief function (i.e. and can be considered a relief surface). [0039] An outer diameter relief surface 44 can peripherally extend from the flank surface 42, in a direction away from the cutting edge extremity 24. The outer diameter relief surface 44 can be entirely located within the cutting diameter Dc.

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

Abstract

L'invention concerne un foret ou une tête de forage à bord de forage (26) qui comprend une extrémité de bord (28) adjacente à une surface en relief. L'extrémité de bord est située à l'extérieur du diamètre de coupe (Dc).
PCT/IL2015/050201 2014-03-19 2015-02-23 Foret ou tête de forage à bord de brunissage WO2015140781A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/127,094 US10005136B2 (en) 2014-09-23 2015-02-23 Drill or drill head with burnishing margin
IL247046A IL247046B (en) 2014-03-19 2016-07-28 A drill or drill head that includes a polishing edge

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US14/219,893 2014-03-19
US14/219,893 US20150266107A1 (en) 2014-03-19 2014-03-19 Drill and Drill Head with Drill Margin
US201462054150P 2014-09-23 2014-09-23
US62/054,150 2014-09-23

Publications (1)

Publication Number Publication Date
WO2015140781A1 true WO2015140781A1 (fr) 2015-09-24

Family

ID=52779990

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2015/050201 WO2015140781A1 (fr) 2014-03-19 2015-02-23 Foret ou tête de forage à bord de brunissage

Country Status (3)

Country Link
DE (1) DE102015003205A1 (fr)
IL (1) IL247046B (fr)
WO (1) WO2015140781A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003136317A (ja) * 2001-10-25 2003-05-14 Osg Corp ドリル
EP1475173A1 (fr) * 2003-05-05 2004-11-10 Safety Tête de foret de lissage
US20070227766A1 (en) * 2004-07-09 2007-10-04 Ibiden Co., Ltd Drill and Method of Producing Printed Circuit Board
US8419322B2 (en) 2008-08-07 2013-04-16 Komet Group Gmbh Rotating cutting tool with support element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003136317A (ja) * 2001-10-25 2003-05-14 Osg Corp ドリル
EP1475173A1 (fr) * 2003-05-05 2004-11-10 Safety Tête de foret de lissage
US20070227766A1 (en) * 2004-07-09 2007-10-04 Ibiden Co., Ltd Drill and Method of Producing Printed Circuit Board
US8419322B2 (en) 2008-08-07 2013-04-16 Komet Group Gmbh Rotating cutting tool with support element

Also Published As

Publication number Publication date
IL247046A0 (en) 2016-09-29
IL247046B (en) 2020-04-30
DE102015003205A1 (de) 2015-09-24

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