JPS5721213A - Drill - Google Patents
DrillInfo
- 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
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
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)
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)
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 |
-
1980
- 1980-07-14 JP JP9600580A patent/JPS5721213A/en active Granted
Cited By (5)
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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