IE41050L - Twist drill. - Google Patents

Twist drill.

Info

Publication number
IE41050L
IE41050L IE751033A IE103375A IE41050L IE 41050 L IE41050 L IE 41050L IE 751033 A IE751033 A IE 751033A IE 103375 A IE103375 A IE 103375A IE 41050 L IE41050 L IE 41050L
Authority
IE
Ireland
Prior art keywords
drill
radius
cutting edges
angle
faces
Prior art date
Application number
IE751033A
Other versions
IE41050B1 (en
Original Assignee
Osborn Mushet Tools 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
Application filed by Osborn Mushet Tools Ltd filed Critical Osborn Mushet Tools Ltd
Publication of IE41050L publication Critical patent/IE41050L/en
Publication of IE41050B1 publication Critical patent/IE41050B1/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
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/24—Overall form of drilling tools
    • B23B2251/241—Cross sections of the diameter of the drill
    • 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
    • B23B2251/406—Flutes, i.e. chip conveying grooves of special form not otherwise provided for

Landscapes

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

Abstract

A twist drill having a cross sectional shape such that the curvatures of the surfaces of the drill faces, defined by the flute leading faces in planes transverse to the drill axes are convex, the convexity being of such an extent that it conforms substantially to a radius of between 0.9 and 1.2 of the drill radius, and having a conventional helix angle, that is to say between 25degrees and 45degrees and a conventional point angle, that is to say between 90degrees and 150degrees so that the cutting edges are curved but lie on the surface of an imaginary cone having the same axis as the drill can be sharpened on a conventional drill grinding machine and the lip rake angle is substantially constant along the cutting edges radially outwards of a core portion of the drill. [IN144887A1]
IE1033/75A 1974-05-17 1975-05-08 An improvement in or relating to twist drills IE41050B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22130/74A GB1509912A (en) 1974-05-17 1974-05-17 Twist drills

Publications (2)

Publication Number Publication Date
IE41050L true IE41050L (en) 1975-11-17
IE41050B1 IE41050B1 (en) 1979-10-10

Family

ID=10174379

Family Applications (1)

Application Number Title Priority Date Filing Date
IE1033/75A IE41050B1 (en) 1974-05-17 1975-05-08 An improvement in or relating to twist drills

Country Status (15)

Country Link
JP (1) JPS50156790A (en)
AU (1) AU500271B2 (en)
BR (1) BR7503011A (en)
CA (1) CA1022775A (en)
DE (1) DE2521938C3 (en)
ES (1) ES437919A1 (en)
FR (1) FR2270978A1 (en)
GB (1) GB1509912A (en)
IE (1) IE41050B1 (en)
IL (1) IL47302A (en)
IN (1) IN144887B (en)
IT (1) IT1038197B (en)
NL (1) NL7505612A (en)
SE (1) SE7505581L (en)
ZA (1) ZA753040B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5331286A (en) * 1976-09-02 1978-03-24 Riyousuke Hosoi Ball end mill
SE8300910L (en) * 1983-02-18 1984-08-19 Santrade Ltd COMPOSITION BODY CONSISTS OF A SUBSTRATE COATED WITH HEART, Wear-resistant finish
GB2184046B (en) * 1985-12-13 1990-01-24 Skf & Dormer Tools Twist drill
JPS634211U (en) * 1986-06-23 1988-01-12
NL8821044A (en) * 1988-10-21 1990-10-01 Zubkov Alexei Vladimirovich SPIRAL DRILL.
EP2366478B1 (en) * 2001-07-10 2020-04-15 Mitsubishi Materials Corporation Drill
JP2006055965A (en) * 2004-08-23 2006-03-02 Osg Corp Cemented carbide drill causing low work hardening
JP5301647B2 (en) * 2009-02-20 2013-09-25 オーエスジー株式会社 Drill tap and internal thread processing method

Also Published As

Publication number Publication date
NL7505612A (en) 1975-11-19
DE2521938C3 (en) 1980-03-06
DE2521938A1 (en) 1975-11-27
IL47302A0 (en) 1975-07-28
IN144887B (en) 1978-07-22
CA1022775A (en) 1977-12-20
BR7503011A (en) 1976-04-20
DE2521938B2 (en) 1979-07-05
ZA753040B (en) 1976-04-28
GB1509912A (en) 1978-05-04
IT1038197B (en) 1979-11-20
IE41050B1 (en) 1979-10-10
AU500271B2 (en) 1979-05-17
JPS50156790A (en) 1975-12-18
ES437919A1 (en) 1977-01-01
IL47302A (en) 1978-03-10
FR2270978A1 (en) 1975-12-12
SE7505581L (en) 1975-11-18
AU8125675A (en) 1976-11-25

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