JPS5721213A - Drill - Google Patents

Drill

Info

Publication number
JPS5721213A
JPS5721213A JP9600580A JP9600580A JPS5721213A JP S5721213 A JPS5721213 A JP S5721213A JP 9600580 A JP9600580 A JP 9600580A JP 9600580 A JP9600580 A JP 9600580A JP S5721213 A JPS5721213 A JP S5721213A
Authority
JP
Japan
Prior art keywords
drill
round hole
hole
load applied
thrust load
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
JP9600580A
Other languages
Japanese (ja)
Other versions
JPS6147645B2 (en
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 JP9600580A priority Critical patent/JPS5721213A/en
Publication of JPS5721213A publication Critical patent/JPS5721213A/en
Publication of JPS6147645B2 publication Critical patent/JPS6147645B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To decrease a thrust load applied to a drill at drilling, by providing a long hole axially in the point end central part of a drill of solid type.
CONSTITUTION: A cylindrical round hole 4 is provided in such a manner as to divide a chisel edge 11 from a point end part F in the edge part with cutting edges 12, 13 of a drill toward the side of its shank. The round hole 4 is provided along the axial line of a drill main body not to leave a column shaped core part in a drilled hole. Depth l of the round hole is set to such a value that regrinding can be performed a suitable number of times. Substantial length of the chisel edge 11 with a large negative rake angle can be decreased by the provided round hole 4, thus a thrust load applied from that portion can be widely reduced.
COPYRIGHT: (C)1982,JPO&Japio
JP9600580A 1980-07-14 1980-07-14 Drill Granted JPS5721213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9600580A JPS5721213A (en) 1980-07-14 1980-07-14 Drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9600580A JPS5721213A (en) 1980-07-14 1980-07-14 Drill

Publications (2)

Publication Number Publication Date
JPS5721213A true JPS5721213A (en) 1982-02-03
JPS6147645B2 JPS6147645B2 (en) 1986-10-20

Family

ID=14153015

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9600580A Granted JPS5721213A (en) 1980-07-14 1980-07-14 Drill

Country Status (1)

Country Link
JP (1) JPS5721213A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6211513U (en) * 1985-07-05 1987-01-24
US4826368A (en) * 1986-06-07 1989-05-02 Hertel Ag Werkzeuge & Hartstoffe Twist drill
WO2004039525A1 (en) * 2002-11-01 2004-05-13 Kabushiki Kaisha Miyanaga Drill bit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6691998B1 (en) 2019-12-24 2020-05-13 株式会社鈴木 Semiconductor device manufacturing method and semiconductor device manufacturing apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6211513U (en) * 1985-07-05 1987-01-24
JPH0248174Y2 (en) * 1985-07-05 1990-12-18
US4826368A (en) * 1986-06-07 1989-05-02 Hertel Ag Werkzeuge & Hartstoffe Twist drill
WO2004039525A1 (en) * 2002-11-01 2004-05-13 Kabushiki Kaisha Miyanaga Drill bit
US7137462B2 (en) 2002-11-01 2006-11-21 Kabushiki Kaisha Miyanaga Drill bit

Also Published As

Publication number Publication date
JPS6147645B2 (en) 1986-10-20

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