JPS5531523A - Twist drill - Google Patents
Twist drillInfo
- Publication number
- JPS5531523A JPS5531523A JP10139078A JP10139078A JPS5531523A JP S5531523 A JPS5531523 A JP S5531523A JP 10139078 A JP10139078 A JP 10139078A JP 10139078 A JP10139078 A JP 10139078A JP S5531523 A JPS5531523 A JP S5531523A
- Authority
- JP
- Japan
- Prior art keywords
- width
- drill
- butted
- small
- central
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
- B24B3/26—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
PURPOSE: To prevent a twist drill from vibrating when it is butted on a workpiece, by providing small-width cutting faces and large-width lands, which are symmetric with each other with regard to the axis of the drill, and providing central cutting edges inside the small-width cutting faces so that cutting edges intersect each other at a central butted point.
CONSTITUTION: The twist drill are provided with the small-width cutting faces 3, 3a and the large-width lands 4, 4a, which are symmetric with regard to the axis of the drill. The central cutting edges 7, 8 are provided inside the cutting faces 3, 3a and intersect each other at the central butted point 2. The tip angle between the small-width cutting faces 3, 3a is set at about 118°±3°. The angle between the axis of the drill and each of the large-width lands 4, 4a is set at about 30W37°. This results in preventing the twist-drill from vibrating when it is butted on the workpiece. The drilling property with the obtuse-angle contact of the cutting edges is improved.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10139078A JPS5531523A (en) | 1978-08-22 | 1978-08-22 | Twist drill |
NL7906147A NL7906147A (en) | 1978-08-22 | 1979-08-13 | SPIRAL DRILL AND DEVICE FOR GRINDING THEREOF. |
DE19792933632 DE2933632A1 (en) | 1978-08-22 | 1979-08-20 | SPIRAL DRILL AND GRINDING MACHINE FOR GRINDING THIS SPIRAL DRILL |
CA334,731A CA1124108A (en) | 1978-08-22 | 1979-08-20 | Twist drill and apparatus of grinding same |
SE7906970A SE7906970L (en) | 1978-08-22 | 1979-08-21 | SPIRAL DRILL AND DEVICE FOR GRINDING THE SAME |
GB7929117A GB2028190B (en) | 1978-08-22 | 1979-08-21 | Twist drill and twist drill grinding apparatus |
FR7921138A FR2433996A1 (en) | 1978-08-22 | 1979-08-22 | Jig ground twist drill - has plane cutting edges with lateral edges in centre and point symmetrical open areas on tip (NL 26.2.80) |
CA381,820A CA1132797A (en) | 1978-08-22 | 1981-07-15 | Twist drill and apparatus of grinding same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10139078A JPS5531523A (en) | 1978-08-22 | 1978-08-22 | Twist drill |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5531523A true JPS5531523A (en) | 1980-03-05 |
Family
ID=14299419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10139078A Pending JPS5531523A (en) | 1978-08-22 | 1978-08-22 | Twist drill |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPS5531523A (en) |
FR (1) | FR2433996A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140193220A1 (en) * | 2012-04-11 | 2014-07-10 | Sumitomo Electric Hardmetal Corp. | Bit exchangeable drill |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE502005010218D1 (en) | 2004-03-17 | 2010-10-21 | Kennametal Inc | DRILLS |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR669821A (en) * | 1929-11-30 | |||
GB168634A (en) * | 1920-05-08 | 1921-09-08 | Herbert Hunt | Improvements in twist drill point grinding machines |
GB306887A (en) * | 1928-02-27 | 1929-07-11 | Paul Touzot | Improvements in or relating to apparatus for sharpening twist drills |
CH135810A (en) * | 1929-05-31 | 1929-10-15 | Huguenin Henri | Method for sharpening small drills and tools for implementing said method. |
FR959100A (en) * | 1946-02-08 | 1950-03-23 | ||
FR1138018A (en) * | 1955-12-06 | 1957-06-06 | Method and apparatus for sharpening drills | |
US2932924A (en) * | 1956-10-11 | 1960-04-19 | Zachow Frank Henry | Drill sharpening apparatus |
US2932135A (en) * | 1956-12-18 | 1960-04-12 | Tatar Alexander | Machine for sharpening four-face drills |
-
1978
- 1978-08-22 JP JP10139078A patent/JPS5531523A/en active Pending
-
1979
- 1979-08-22 FR FR7921138A patent/FR2433996A1/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140193220A1 (en) * | 2012-04-11 | 2014-07-10 | Sumitomo Electric Hardmetal Corp. | Bit exchangeable drill |
US9370829B2 (en) * | 2012-04-11 | 2016-06-21 | Sumitomo Electric Hardmetal Corp. | Bit exchangeable drill |
Also Published As
Publication number | Publication date |
---|---|
FR2433996A1 (en) | 1980-03-21 |
FR2433996B1 (en) | 1983-02-18 |
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