Drill and cutting method
AssigneeSumitomo Electric Hardmetal Corp.
InventorYusuke Makiuchi
Life of this patent
Estimating the term…
Abstract
A drill includes a flank face, a rake face, and a main cutting edge on a ridgeline between the rake face and the flank face. The main cutting edge has a first curved portion having a curved shape contiguous with the flank face and a second curved portion having a curved shape contiguous with the rake face in a sectional view orthogonal to an extending direction of the main cutting edge. A first curvature radius of the first curved portion is larger than a second curvature radius of the second curved portion.
Claims4
A drill comprising:
- a flank face;
- a rake face;
- and
- a main cutting edge on a ridgeline between the rake face and the flank face, wherein
- the main cutting edge includes a first curved portion having a curved shape contiguous with the flank face, a second curved portion having a curved shape contiguous with the rake face and a connecting portion having a linear shape contiguous with the first curved portion and the second curved portion in a sectional view orthogonal to an extending direction of the main cutting edge,
- the first curved portion has a first curvature radius that is larger than a second curvature radius of the second curved portion, and
- the connecting portion has a width of less than 0.05 mm.
A cutting method comprising performing cutting processing of a workpiece with a drill, wherein
- the drill includes a flank face, a rake face, and a main cutting edge on a ridgeline between the rake face and the flank face,
- the main cutting edge includes a first curved portion having a curved shape contiguous with the flank face, a second curved portion having a curved shape contiguous with the rake face, and a connecting portion having a linear shape contiguous with the first curved portion and the second curved portion in a sectional view orthogonal to an extending direction of the main cutting edge,
- the first curved portion has a first curvature radius that is larger than a second curvature radius of the second curved portion, and
- the cutting processing is performed under a condition that a feed rate per edge of the drill is 5% or more of an edge diameter of the drill per revolution, and
- the connecting portion has a width of less than 0.05 mm.
Dependencies are inferred from the claim text.