Drill
AssigneeSumitomo Electric Hardmetal Corp.
InventorShinya Nakata
Life of this patent
Estimating the term…
Abstract
The drill has a rake face, a flank face, and an outer circumferential surface. The flank face is continuous to the rake face. The outer circumferential surface is continuous to both the rake face and the flank face. A ridgeline between the rake face and the flank face constitutes a cutting edge. A ridgeline between the rake face and the outer circumferential surface constitutes an outer circumferential end. A groove is provided cyclically in the rake face to extend at an angle relative to an axis of the drill, the angle being larger than a helix angle of the drill. The groove has a depth of more than or equal to 1.5 μm.
Claims13
A drill comprising:
- a rake face;
- a flank face continuous to the rake face;
- and
- an outer circumferential surface continuous to both the rake face and the flank face, wherein
- a ridgeline between the rake face and the flank face constitutes a cutting edge,
- a ridgeline between the rake face and the outer circumferential surface constitutes an outer circumferential end,
- a groove is provided cyclically in the rake face to extend at an angle relative to an axis of the drill, the angle being larger than a helix angle of the drill,
- the groove has a depth of more than or equal to 1.5 μm,
- the groove is inclined relative to the cutting edge,
- the groove has a plurality of groove portions, and
- each of the plurality of groove portions is continuous to the cutting edge.
Dependencies are inferred from the claim text.