To provide a boring tool capable of sufficiently increasing dimensional accuracy of a machined hole.
The boring tool is inserted into a prepared hole, previously formed in a workpiece, to cut the inner wall surface of the prepared hole and form a machined hole. The boring tool comprises: a tool body 2 having a shaft shape and rotated around its axis O; and a plurality of cutting edges 3 formed on an outer circumferential surface of the tool body 2 in the circumferential direction with mutual intervals, and extending along the axis O direction. The number of cutting edges 3 is an even number, and all the pairs of the cutting edges 3 disposed back-to-back by sandwiching the axis O on a cross section perpendicular to the axis O are not at the positions of 180° rotational symmetry to each other.
| JPH079350 | ABRASIVE GRAIN TOOL |
| JP6362003 | Cover cutting tool |
| WO/2017/188154 | CUTTING TOOL |
NARETA KENICHI
MABUCHI MASAYUKI
| JP2002200512A | 2002-07-16 | |||
| JPH11507303A | 1999-06-29 | |||
| JPS499791A | 1974-01-28 | |||
| JP2007098497A | 2007-04-19 | |||
| JPS49148591U | 1974-12-23 |
| EP0195838A1 | 1986-10-01 |
Tadashi Takahashi
Hiroshi Masui
Fumihiro Hosokawa