JPS56126510A - Twist drill for deep hole - Google Patents

Twist drill for deep hole

Info

Publication number
JPS56126510A
JPS56126510A JP2413580A JP2413580A JPS56126510A JP S56126510 A JPS56126510 A JP S56126510A JP 2413580 A JP2413580 A JP 2413580A JP 2413580 A JP2413580 A JP 2413580A JP S56126510 A JPS56126510 A JP S56126510A
Authority
JP
Japan
Prior art keywords
drill
recesses
hole
cutting edge
deep hole
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
JP2413580A
Other languages
Japanese (ja)
Inventor
Akio Sakihara
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 JP2413580A priority Critical patent/JPS56126510A/en
Publication of JPS56126510A publication Critical patent/JPS56126510A/en
Pending legal-status Critical Current

Links

Landscapes

  • Drilling Tools (AREA)

Abstract

PURPOSE: To improve the centering property of a drill and to prevent the hole from curving, for making a deep small hole in a hard-to-cut material such as stainless steel, by providing recesses of prescribed width on the tip surfaces of the cutting edge of a drill.
CONSTITUTION: Recesses 12, 12a are provided on the tip surfaces 11 of the cutting edge of a twist drill 10 for drilling a deep hole so that the recesses 12, 12a are asymmetrically located on concentric circles. The width of the recesses 12, 12a is one fourth to one eighth of the length of the cutting edge, and the diameter of the drill is not more than 1.0mm. The drill 10 is shaped so that its twist angle is continuously varied from the tip to the root. Since the recesses 12, 12a of prescribed width are provided, the area of contact of the drill 10 with a hard-to-cut material such as stainless steel is reduced to improve the centering property of the drill 10 to prevent the hole from curving.
COPYRIGHT: (C)1981,JPO&Japio
JP2413580A 1980-02-29 1980-02-29 Twist drill for deep hole Pending JPS56126510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2413580A JPS56126510A (en) 1980-02-29 1980-02-29 Twist drill for deep hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2413580A JPS56126510A (en) 1980-02-29 1980-02-29 Twist drill for deep hole

Publications (1)

Publication Number Publication Date
JPS56126510A true JPS56126510A (en) 1981-10-03

Family

ID=12129866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2413580A Pending JPS56126510A (en) 1980-02-29 1980-02-29 Twist drill for deep hole

Country Status (1)

Country Link
JP (1) JPS56126510A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102389991A (en) * 2011-12-06 2012-03-28 株洲钻石切削刀具股份有限公司 Double-margin twist drill

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS478932U (en) * 1971-02-23 1972-10-03
JPS49103290A (en) * 1973-02-05 1974-09-30

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS478932U (en) * 1971-02-23 1972-10-03
JPS49103290A (en) * 1973-02-05 1974-09-30

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102389991A (en) * 2011-12-06 2012-03-28 株洲钻石切削刀具股份有限公司 Double-margin twist drill

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