JPS56114609A - Drilling tool - Google Patents

Drilling tool

Info

Publication number
JPS56114609A
JPS56114609A JP1756780A JP1756780A JPS56114609A JP S56114609 A JPS56114609 A JP S56114609A JP 1756780 A JP1756780 A JP 1756780A JP 1756780 A JP1756780 A JP 1756780A JP S56114609 A JPS56114609 A JP S56114609A
Authority
JP
Japan
Prior art keywords
cutting edge
main body
tool main
cutting edges
edges
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
JP1756780A
Other languages
Japanese (ja)
Inventor
Hideo Negishi
Kaoru Goto
Sueji Takatani
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.)
Mitsubishi Metal Corp
Original Assignee
Mitsubishi Metal Corp
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 Mitsubishi Metal Corp filed Critical Mitsubishi Metal Corp
Priority to JP1756780A priority Critical patent/JPS56114609A/en
Priority to US06/192,627 priority patent/US4373839A/en
Priority to DE3037097A priority patent/DE3037097C2/en
Publication of JPS56114609A publication Critical patent/JPS56114609A/en
Priority to US06/428,717 priority patent/US4565471A/en
Pending legal-status Critical Current

Links

Landscapes

  • Drilling Tools (AREA)

Abstract

PURPOSE: To perform desired drilling work in a drill even for a large area of its center portion without a cutting edge, by providing an auxiliary cutting edge not continuous to cutting edges at the position backward to a feed direction for the cutting edge in the point end center portion of a tool main body without the cutting edges.
CONSTITUTION: Inner end edges 4a, 5a of cutting edges 4, 5 provided at the end part of a drill tool main body 1a are separately provided from a relatively rotational center of the tool main body 1a for a work. Further in the point end center portion of a tool main body 1 without the cutting edges 4, 5, an auxiliary cutting edge 7 not continuous to the before described cutting edges 4, 5 is provided at a position backward to a feed direction, then a column-shaped core 6 produced by drilling operation is cut or stirred and removed by said auxiliary cutting edge 7.
COPYRIGHT: (C)1981,JPO&Japio
JP1756780A 1979-10-02 1980-02-15 Drilling tool Pending JPS56114609A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP1756780A JPS56114609A (en) 1980-02-15 1980-02-15 Drilling tool
US06/192,627 US4373839A (en) 1979-10-02 1980-09-30 Drill bit
DE3037097A DE3037097C2 (en) 1979-10-02 1980-10-01 Solid drilling tools, especially twist drills
US06/428,717 US4565471A (en) 1979-10-02 1982-09-30 Drill bit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1756780A JPS56114609A (en) 1980-02-15 1980-02-15 Drilling tool

Publications (1)

Publication Number Publication Date
JPS56114609A true JPS56114609A (en) 1981-09-09

Family

ID=11947484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1756780A Pending JPS56114609A (en) 1979-10-02 1980-02-15 Drilling tool

Country Status (1)

Country Link
JP (1) JPS56114609A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005205593A (en) * 2003-12-29 2005-08-04 Hanita Metal Works Ltd Ball nose end mill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7909545B2 (en) 2003-12-19 2011-03-22 Hanita Metal Works, Ltd. Ballnose end mill
JP2005205593A (en) * 2003-12-29 2005-08-04 Hanita Metal Works Ltd Ball nose end mill

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