Step drill
AssigneeKennametal Inc.
InventorsHerbert Rudolf Kauper, Jürgen Schwägerl
Life of this patent
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Abstract
The invention relates to a step drill having a shaft section extending along a longitudinal axis of the step drill and a cutting section with a cutting tip, and having a chip-breaking geometry which comprises a concavely curved surface and is configured such that ribbon chips are broken on the concavely curved surface during rotation of the step drill, whereby the chip-breaking geometry is disposed on a reaming step of the step drill.
Claims9
A step drill comprising a shaft section extending along a longitudinal axis of the step drill and a cutting section with a cutting tip, the cutting section having a chip-breaking geometry comprising a concavely curved surface configured such that ribbon chips are broken on the concavely curved surface during rotation of the step drill, wherein the chip-breaking geometry is disposed on a reaming step of the step drill, wherein the chip-breaking geometry comprises a depression in a surface of a flute, and wherein the depression has an arcuate contour when viewed from the cutting tip in a plan view of the step drill.
Dependencies are inferred from the claim text.