JPS56114609A - Drilling tool - Google Patents
Drilling toolInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005205593A (en) * | 2003-12-29 | 2005-08-04 | Hanita Metal Works Ltd | Ball nose end mill |
-
1980
- 1980-02-15 JP JP1756780A patent/JPS56114609A/en active Pending
Cited By (2)
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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