EP0792705A3 - Drill bit - roll forging process - Google Patents

Drill bit - roll forging process Download PDF

Info

Publication number
EP0792705A3
EP0792705A3 EP97301286A EP97301286A EP0792705A3 EP 0792705 A3 EP0792705 A3 EP 0792705A3 EP 97301286 A EP97301286 A EP 97301286A EP 97301286 A EP97301286 A EP 97301286A EP 0792705 A3 EP0792705 A3 EP 0792705A3
Authority
EP
European Patent Office
Prior art keywords
drill bit
flutes
blank
wheels
flute
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.)
Granted
Application number
EP97301286A
Other languages
German (de)
French (fr)
Other versions
EP0792705A2 (en
EP0792705B1 (en
Inventor
Rudolf Jungwirth
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.)
Black and Decker Inc
Original Assignee
Black and Decker 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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0792705A2 publication Critical patent/EP0792705A2/en
Publication of EP0792705A3 publication Critical patent/EP0792705A3/en
Application granted granted Critical
Publication of EP0792705B1 publication Critical patent/EP0792705B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/10—Making helical bodies or bodies having parts of helical shape twist-drills; screw-taps

Abstract

Drill bit roll forging apparatus, a method employing such apparatus, and a drill bit so formed, for roll forging a drill bit having two opposed helical flutes, said apparatus comprising:
  • a) two forging wheels (30) disposed opposite one another and adapted to form the flutes (4,6) and whose axes lie in first and second substantially parallel wheel axis planes (60); wherein
  • b) a blank (22) is adapted to be disposed between the wheels on a blank axis (20) parallel said wheel axis planes;
  • c) a blank plane (20a) contains said blank axis and is perpendicular said wheel axis planes;
  • d) the wheel axes are inclined (α) in their respective wheel axis planes with respect to the blank plane and on opposite sides thereto and whereby the helix angle of the drill bit is determined;
  • e) the wheels have a spiral circumference (34a) sufficient to form a web between said flutes which tapers by at least 50% from a shank end of said flutes to a working end of the drill bit;
  • f) the wheels have an asymmetric edge profile having a "centre of spread", wherein each centre of spread moves transversely with respect to the respective wheel axis as each wheel rotates from a start position to an end position; and
  • g) said wheel axes are positioned in said wheel axis planes such that said centres of spread of the wheels remain one on either side of said blank plane during rotation of the wheels from said start position to said end position.
    • A drill bit (1) has two opposed helical flutes and a web between said flutes which tapers by at least 50% from a shank end of said flutes to a working end of the drill bit, wherein the drill bit is roll formed from a blank, wherein the cross-section of the drill bit changes from its shank end to its working tip, such cross-section comprising quadrants defined by a diameter of the section from a front cutting lip of one flute to the corresponding cutting lip of the other, each flute primarily occupying opposing flute quadrants, wherein such cross-section changes from shank end to working tip not only by virtue of a decreasing web thickness, but also by the flute increasingly being incursive into the quadrant ahead of the flute quadrant in the direction of cutting rotation of the drill bit.
    EP19970301286 1996-03-02 1997-02-26 Drill bit - roll forging process Expired - Lifetime EP0792705B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    GB9604544 1996-03-02
    GB9604544A GB2310622A (en) 1996-03-02 1996-03-02 Drill bit

    Publications (3)

    Publication Number Publication Date
    EP0792705A2 EP0792705A2 (en) 1997-09-03
    EP0792705A3 true EP0792705A3 (en) 1998-11-11
    EP0792705B1 EP0792705B1 (en) 2002-05-08

    Family

    ID=10789794

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19970301286 Expired - Lifetime EP0792705B1 (en) 1996-03-02 1997-02-26 Drill bit - roll forging process

    Country Status (3)

    Country Link
    EP (1) EP0792705B1 (en)
    DE (1) DE69712389T2 (en)
    GB (1) GB2310622A (en)

    Families Citing this family (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7101125B2 (en) 2003-12-17 2006-09-05 Kennametal Inc. Twist drill
    DE102010041164B4 (en) 2010-09-22 2022-01-27 Adolf Würth Gmbh & Co Kg Method of making a drill
    WO2014015154A1 (en) 2012-07-18 2014-01-23 Milwaukee Electric Tool Corporation Hole saw
    DE102014225320B4 (en) 2014-12-09 2018-05-03 Robert Bosch Gmbh drilling
    DE102016211953A1 (en) 2016-06-30 2018-01-04 Robert Bosch Gmbh drilling
    CN216028284U (en) 2018-07-10 2022-03-15 米沃奇电动工具公司 Hole saw
    CN112077370A (en) 2019-06-13 2020-12-15 肯纳金属印度有限公司 Indexable drill insert
    USD958855S1 (en) 2019-12-09 2022-07-26 Milwaukee Electric Tool Corporation Hole saw
    CN112705573B (en) * 2021-03-25 2021-08-03 苏州用朴精密科技有限公司 Be used for carbide milling cutter contour machining rolling device
    CN113102957A (en) * 2021-04-25 2021-07-13 江苏飞达钻头股份有限公司 Waste-free production process for producing rough shank twist drill

    Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE453560C (en) * 1927-12-09 Karl Schmachtenberg Calibrated rollers or roller segments for the production of twist drills
    DE1104481B (en) * 1953-04-10 1961-04-13 Franz Erdelyi Method and device for hot rolling cutting tools having longitudinal grooves with a rotating working movement from a round bar
    DE2129406A1 (en) * 1971-06-14 1972-12-21 Kobe Steel Ltd Method of making rolled twist drills and twist drills made thereafter
    DE2459286A1 (en) * 1974-12-14 1976-06-24 Kemmer Gmbh & Co Kg Paul Small diameter spiral drill - has largest groove angle at drill point, preferably 35 degrees, lowest at lower end

    Patent Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE453560C (en) * 1927-12-09 Karl Schmachtenberg Calibrated rollers or roller segments for the production of twist drills
    DE1104481B (en) * 1953-04-10 1961-04-13 Franz Erdelyi Method and device for hot rolling cutting tools having longitudinal grooves with a rotating working movement from a round bar
    DE2129406A1 (en) * 1971-06-14 1972-12-21 Kobe Steel Ltd Method of making rolled twist drills and twist drills made thereafter
    DE2459286A1 (en) * 1974-12-14 1976-06-24 Kemmer Gmbh & Co Kg Paul Small diameter spiral drill - has largest groove angle at drill point, preferably 35 degrees, lowest at lower end

    Also Published As

    Publication number Publication date
    EP0792705A2 (en) 1997-09-03
    DE69712389D1 (en) 2002-06-13
    EP0792705B1 (en) 2002-05-08
    GB2310622A (en) 1997-09-03
    GB9604544D0 (en) 1996-05-01
    DE69712389T2 (en) 2003-01-02

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