Drill
AssigneesSumitomo Electric Hardmetal Corp., Toyota Jidosha Kabushiki Kaisha
InventorsMasashi YAMADA, Naoyuki WAKATSUKI, Yasumasa SUNANO, Takayuki NATORI, Riku TADOKORO
Life of this patent
Estimating the term…
Abstract
The outer peripheral surface is provided with a first margin contiguous to each of the cutting edge and the flank face, and a second margin that is located on the rear side with respect to the first margin in a rotation direction and that is separated from each of the flank face and the thinning face. An outer peripheral portion of the first margin and an outer peripheral portion of the second margin have respective back tapers having the same angle. In a direction parallel to the axial line, a distance between a front end of the first margin and a front end of the second margin is more than or equal to 3 mm and less than or equal to 5 mm.
Claims9
A drill rotatable about an axial line, the drill comprising:
- a flank face;
- a thinning face contiguous to the flank face;
- an outer peripheral surface contiguous to each of the flank face and the thinning face;
- and
- a swarf discharging surface contiguous to each of the flank face and the outer peripheral surface, wherein
- a ridgeline between the flank face and the swarf discharging surface forms a cutting edge,
- the outer peripheral surface is provided with a first margin contiguous to each of the cutting edge and the flank face, and a second margin that is located on a rear side with respect to the first margin in a rotation direction and that is separated from each of the flank face and the thinning face,
- an outer peripheral portion of the first margin and an outer peripheral portion of the second margin have respective back tapers having the same angle, and
- in a direction parallel to the axial line, a distance between a front end of the first margin and a front end of the second margin is more than or equal to 3 mm and less than or equal to 5 mm.
(canceled)
Dependencies are inferred from the claim text.