Rotary tool, in particular a drill
AssigneeKennametal Inc.
InventorHerbert Rudolf Kauper
Life of this patent
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Abstract
In order to provide a rotary tool, in particular a drill, with a long service life together with high-quality drill holes, particularly in the case of through bores, the invention provides a cutting head which extends along a rotational axis and has a plurality of main cutting edges which extend radially outwards and each end at a cutting corner having a corner bevel, wherein the corner bevels are of differing designs, specifically in the form of a roughing bevel and in the form of a finishing bevel.
Claims13
A rotary tool comprising a cutting head which extends along a rotation axis and has a plurality of main cutting edges which extend radially outward, each of the cutting edges end at the circumference of the cutting head at a cutting corner having a corner bevel,
- wherein one of the corner bevels is formed as a roughing bevel and another of the corner bevels is formed as a finishing bevel, and
- wherein the finishing bevel has a width and the roughing bevel has a width which is larger than the width of the finishing bevel
- wherein the finishing bevel and the roughing bevel enclose a bevel point angle between them which is between 40° and 100°.
A rotary tool comprising a cutting head which extends along a rotation axis and has a plurality of main cutting edges which extend radially outward, each of the cutting edges end at the circumference of the cutting head at a cutting corner having a corner bevel,
- wherein one of the corner bevels is formed as a roughing bevel and another of the corner bevels is formed as a finishing bevel,
- wherein the finishing bevel has a width and the roughing bevel has a width which is larger than the width of the finishing bevel,
- wherein the cutting head is designed to be asymmetrical with respect to the rotation axis, and the main cutting edge having the roughing bevel is designed as guide cutting edge and the main cutting edge having the finishing bevel is designed as free cutting edge,
- wherein the guide cutting edge and the free cutting edge are arranged at a pitch angle different from 180°.
A rotary tool comprising a cutting head which extends along a rotation axis and has a plurality of main cutting edges which extend radially outward, each of the cutting edges end at the circumference of the cutting head at a cutting corner having a corner bevel,
- wherein one of the corner bevels is formed as a roughing bevel and another of the corner bevels is formed as a finishing bevel, and
- wherein the finishing bevel and the roughing bevel enclose a bevel point angle between them which is between 40° and 100°.
Dependencies are inferred from the claim text.