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JPS57107716A - Drill - Google Patents

Drill

Info

Publication number
JPS57107716A
JPS57107716A JP18482680A JP18482680A JPS57107716A JP S57107716 A JPS57107716 A JP S57107716A JP 18482680 A JP18482680 A JP 18482680A JP 18482680 A JP18482680 A JP 18482680A JP S57107716 A JPS57107716 A JP S57107716A
Authority
JP
Japan
Prior art keywords
drill
cutting edge
cutting
tip
curvature
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
JP18482680A
Other languages
Japanese (ja)
Inventor
Makoto Mitani
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.)
Tanaka Kikinzoku Kogyo KK
Original Assignee
Tanaka Kikinzoku Kogyo 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 Tanaka Kikinzoku Kogyo KK filed Critical Tanaka Kikinzoku Kogyo KK
Priority to JP18482680A priority Critical patent/JPS57107716A/en
Publication of JPS57107716A publication Critical patent/JPS57107716A/en
Pending legal-status Critical Current

Links

Landscapes

  • Drilling Tools (AREA)

Abstract

PURPOSE: To protect the peripheral cutting part of the tip of a drill from damage such as chipping, by curving the cutting edge of the cutting part of the tip convexly in the direction of cutting rotation.
CONSTITUTION: The cutting edge 2 of the cutting part 1 of a drill at its tip is shaped as an arc with a prescribed radius of curvature to set a negative rake angle from the chisel section to contact section of the drill so that the force which acts to the cutting edge 2 around the contact section is divided into a vertical and a horizontal components. The radius of curvature of the cutting edge 2 is preferably made equal to 100 to 33% of the diameter of the drill. The cutting edge 2 may be shaped as an angularly bent line.
COPYRIGHT: (C)1982,JPO&Japio
JP18482680A 1980-12-25 1980-12-25 Drill Pending JPS57107716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18482680A JPS57107716A (en) 1980-12-25 1980-12-25 Drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18482680A JPS57107716A (en) 1980-12-25 1980-12-25 Drill

Publications (1)

Publication Number Publication Date
JPS57107716A true JPS57107716A (en) 1982-07-05

Family

ID=16159964

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18482680A Pending JPS57107716A (en) 1980-12-25 1980-12-25 Drill

Country Status (1)

Country Link
JP (1) JPS57107716A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11510103A (en) * 1995-07-27 1999-09-07 ラルフ・シー・メイズ Drill bit
JP2003340622A (en) * 2002-05-22 2003-12-02 Toshiba Tungaloy Co Ltd Drill
US20130028677A1 (en) * 2010-02-04 2013-01-31 Kennametal, Inc. Drill bit and method for manufacturing
WO2014065361A1 (en) * 2012-10-25 2014-05-01 住友電工ハードメタル株式会社 Small-diameter drill
US9901990B2 (en) 2010-02-04 2018-02-27 Kennametal Inc. Drilling tool

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11510103A (en) * 1995-07-27 1999-09-07 ラルフ・シー・メイズ Drill bit
JP2003340622A (en) * 2002-05-22 2003-12-02 Toshiba Tungaloy Co Ltd Drill
US20130028677A1 (en) * 2010-02-04 2013-01-31 Kennametal, Inc. Drill bit and method for manufacturing
CN105328245A (en) * 2010-02-04 2016-02-17 钴碳化钨硬质合金公司 Drill bit and method for manufacturing
US9403246B2 (en) 2010-02-04 2016-08-02 Kennametal Inc. Drill bit and method for manufacturing
US9901990B2 (en) 2010-02-04 2018-02-27 Kennametal Inc. Drilling tool
US10661356B2 (en) 2010-02-04 2020-05-26 Kennametal Inc. Drilling tool
WO2014065361A1 (en) * 2012-10-25 2014-05-01 住友電工ハードメタル株式会社 Small-diameter drill
JP2014083645A (en) * 2012-10-25 2014-05-12 Sumitomo Electric Hardmetal Corp Small-diameter drill
US9522428B2 (en) 2012-10-25 2016-12-20 Sumitomo Electric Hardmetal Corp. Small-diameter drill

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