FR2299941A1 - Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip - Google Patents

Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Info

Publication number
FR2299941A1
FR2299941A1 FR7503750A FR7503750A FR2299941A1 FR 2299941 A1 FR2299941 A1 FR 2299941A1 FR 7503750 A FR7503750 A FR 7503750A FR 7503750 A FR7503750 A FR 7503750A FR 2299941 A1 FR2299941 A1 FR 2299941A1
Authority
FR
France
Prior art keywords
forming
flats
depressions
chisel tip
drill
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
FR7503750A
Other languages
French (fr)
Other versions
FR2299941B1 (en
Inventor
Peter John Gill
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.)
GKN Screws and Fasteners Ltd
Original Assignee
GKN Screws and Fasteners 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 GKN Screws and Fasteners Ltd filed Critical GKN Screws and Fasteners Ltd
Priority to FR7503750A priority Critical patent/FR2299941A1/en
Publication of FR2299941A1 publication Critical patent/FR2299941A1/en
Application granted granted Critical
Publication of FR2299941B1 publication Critical patent/FR2299941B1/fr
Granted 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K5/00—Making tools or tool parts, e.g. pliers
    • B21K5/02—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The method involves using a cylindrical blank. Dies are used to form the cutting end of the blank (D) into two identical depressions (17b) equally spaced about a central axis. These depressions have opposing surfaces positioned opposite each other to give two wedge shapes. The outer edges (20) may also alter from curved to straight and at an angle to the central axis. The end of each depression is worked to form a flat (17), the flats being diametrically opposed and inclined at the same angle with respect to the blank axis. The flats form a chisel tip passing near the crossing point of the two depressions and angularly displaced with respect to the cutting edge (19) of each depression.
FR7503750A 1975-02-06 1975-02-06 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip Granted FR2299941A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7503750A FR2299941A1 (en) 1975-02-06 1975-02-06 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7503750A FR2299941A1 (en) 1975-02-06 1975-02-06 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Publications (2)

Publication Number Publication Date
FR2299941A1 true FR2299941A1 (en) 1976-09-03
FR2299941B1 FR2299941B1 (en) 1980-07-25

Family

ID=9150867

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7503750A Granted FR2299941A1 (en) 1975-02-06 1975-02-06 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Country Status (1)

Country Link
FR (1) FR2299941A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0304702A1 (en) * 1987-08-08 1989-03-01 Adolf Würth GmbH & Co. KG Drill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0304702A1 (en) * 1987-08-08 1989-03-01 Adolf Würth GmbH & Co. KG Drill
US4948306A (en) * 1987-08-08 1990-08-14 Aldof Wurth GmbH & Co. KG Drill

Also Published As

Publication number Publication date
FR2299941B1 (en) 1980-07-25

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse