Tapered end mill
AssigneeOsg Corporation
InventorRyogo Kawai
Life of this patent
Estimating the term…
Abstract
A tapered end mill includes an outer circumferential cutting edge, a flute is disposed such that a flute bottom radius defined as a distance between a flute bottom and the tool axis decreases from a shank side toward the tool tip side, the flute bottom radius linearly changes at a predetermined gradient angle in the tool axis direction, the gradient angle changes at a predetermined change point to become smaller on the tool tip side as compared to the shank side, and a gradient angle θ1 on the tool tip side relative to the change point is equal to or larger than 0° and smaller than a taper half angle α of a cutting portion provided with the outer circumferential cutting edge, and a gradient angle θ2 on the shank side relative to the change point is larger than the taper half angle α.
Claims7
A tapered end mill including an outer circumferential cutting edge disposed along a flute extending in a tool axis direction with a diameter of the outer circumferential cutting edge reduced toward a tool tip side, wherein
- the flute is disposed such that a flute bottom radius defined as a distance between a flute bottom and the tool axis decreases from a shank side toward the tool tip side, wherein
- the flute includes (i) a tool-tip-side portion extending away from a tool tip to a predetermined change point and (ii) a shank-side portion extending from the change point to a shank-side end of the flute, wherein
- the flute bottom radius linearly changes at a first predetermined gradient angle θ1 in the tool axis direction in the tool-tip-side portion of the flute, and linearly changes at a second predetermined gradient angle θ2 in the tool axis direction in the shank-side portion of the flute, wherein
- the gradient angle θ1 in the tool-tip-side portion of the flute is smaller than the gradient angle θ2 in the shank-side portion of the flute, and wherein
- the gradient angle θ1 in the tool-tip-side portion of the flute is equal to or larger than 0° and smaller than a taper half angle α of a cutting portion provided with the outer circumferential cutting edge, and the gradient angle θ2 in the shank-side portion of the flute is larger than the taper half angle α.
Dependencies are inferred from the claim text.