JPS5531523A - Twist drill - Google Patents

Twist drill

Info

Publication number
JPS5531523A
JPS5531523A JP10139078A JP10139078A JPS5531523A JP S5531523 A JPS5531523 A JP S5531523A JP 10139078 A JP10139078 A JP 10139078A JP 10139078 A JP10139078 A JP 10139078A JP S5531523 A JPS5531523 A JP S5531523A
Authority
JP
Japan
Prior art keywords
width
drill
butted
small
central
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.)
Pending
Application number
JP10139078A
Other languages
Japanese (ja)
Inventor
Koji Kawaragi
Mitsuo Kimura
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.)
KAWARAGI SEISAKUSHO KK
Original Assignee
KAWARAGI SEISAKUSHO KK
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 KAWARAGI SEISAKUSHO KK filed Critical KAWARAGI SEISAKUSHO KK
Priority to JP10139078A priority Critical patent/JPS5531523A/en
Priority to NL7906147A priority patent/NL7906147A/en
Priority to DE19792933632 priority patent/DE2933632A1/en
Priority to CA334,731A priority patent/CA1124108A/en
Priority to SE7906970A priority patent/SE7906970L/en
Priority to GB7929117A priority patent/GB2028190B/en
Priority to FR7921138A priority patent/FR2433996A1/en
Publication of JPS5531523A publication Critical patent/JPS5531523A/en
Priority to CA381,820A priority patent/CA1132797A/en
Pending 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
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/26—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of 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
    • B23B2251/18—Configuration of the drill point

Landscapes

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

Abstract

PURPOSE: To prevent a twist drill from vibrating when it is butted on a workpiece, by providing small-width cutting faces and large-width lands, which are symmetric with each other with regard to the axis of the drill, and providing central cutting edges inside the small-width cutting faces so that cutting edges intersect each other at a central butted point.
CONSTITUTION: The twist drill are provided with the small-width cutting faces 3, 3a and the large-width lands 4, 4a, which are symmetric with regard to the axis of the drill. The central cutting edges 7, 8 are provided inside the cutting faces 3, 3a and intersect each other at the central butted point 2. The tip angle between the small-width cutting faces 3, 3a is set at about 118°±3°. The angle between the axis of the drill and each of the large-width lands 4, 4a is set at about 30W37°. This results in preventing the twist-drill from vibrating when it is butted on the workpiece. The drilling property with the obtuse-angle contact of the cutting edges is improved.
COPYRIGHT: (C)1980,JPO&Japio
JP10139078A 1978-08-22 1978-08-22 Twist drill Pending JPS5531523A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP10139078A JPS5531523A (en) 1978-08-22 1978-08-22 Twist drill
NL7906147A NL7906147A (en) 1978-08-22 1979-08-13 SPIRAL DRILL AND DEVICE FOR GRINDING THEREOF.
DE19792933632 DE2933632A1 (en) 1978-08-22 1979-08-20 SPIRAL DRILL AND GRINDING MACHINE FOR GRINDING THIS SPIRAL DRILL
CA334,731A CA1124108A (en) 1978-08-22 1979-08-20 Twist drill and apparatus of grinding same
SE7906970A SE7906970L (en) 1978-08-22 1979-08-21 SPIRAL DRILL AND DEVICE FOR GRINDING THE SAME
GB7929117A GB2028190B (en) 1978-08-22 1979-08-21 Twist drill and twist drill grinding apparatus
FR7921138A FR2433996A1 (en) 1978-08-22 1979-08-22 Jig ground twist drill - has plane cutting edges with lateral edges in centre and point symmetrical open areas on tip (NL 26.2.80)
CA381,820A CA1132797A (en) 1978-08-22 1981-07-15 Twist drill and apparatus of grinding same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10139078A JPS5531523A (en) 1978-08-22 1978-08-22 Twist drill

Publications (1)

Publication Number Publication Date
JPS5531523A true JPS5531523A (en) 1980-03-05

Family

ID=14299419

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10139078A Pending JPS5531523A (en) 1978-08-22 1978-08-22 Twist drill

Country Status (2)

Country Link
JP (1) JPS5531523A (en)
FR (1) FR2433996A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140193220A1 (en) * 2012-04-11 2014-07-10 Sumitomo Electric Hardmetal Corp. Bit exchangeable drill

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502005010218D1 (en) 2004-03-17 2010-10-21 Kennametal Inc DRILLS

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR669821A (en) * 1929-11-30
GB168634A (en) * 1920-05-08 1921-09-08 Herbert Hunt Improvements in twist drill point grinding machines
GB306887A (en) * 1928-02-27 1929-07-11 Paul Touzot Improvements in or relating to apparatus for sharpening twist drills
CH135810A (en) * 1929-05-31 1929-10-15 Huguenin Henri Method for sharpening small drills and tools for implementing said method.
FR959100A (en) * 1946-02-08 1950-03-23
FR1138018A (en) * 1955-12-06 1957-06-06 Method and apparatus for sharpening drills
US2932924A (en) * 1956-10-11 1960-04-19 Zachow Frank Henry Drill sharpening apparatus
US2932135A (en) * 1956-12-18 1960-04-12 Tatar Alexander Machine for sharpening four-face drills

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140193220A1 (en) * 2012-04-11 2014-07-10 Sumitomo Electric Hardmetal Corp. Bit exchangeable drill
US9370829B2 (en) * 2012-04-11 2016-06-21 Sumitomo Electric Hardmetal Corp. Bit exchangeable drill

Also Published As

Publication number Publication date
FR2433996A1 (en) 1980-03-21
FR2433996B1 (en) 1983-02-18

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