Drill and method for producing a drill
AssigneeKennametal Inc.
InventorsHerbert Rudolf Kauper, Christian Strauchmann, Juergen Schwaegerl
Life of this patent
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Abstract
The invention relates to a drill comprising a body which extends along a longitudinal axis (L) from a rear side (B) to a front side (F), wherein the body comprises a main cutting edge on the front side (F), wherein the body comprises at least one guide bevel which extends in axial direction (A) and toward the front side (F), wherein, toward the front side (F), the guide bevel has an end section which is tapered. The invention further relates to a method for producing such a drill.
Claims9
A method for producing a drill, the drill comprising a body extending along a longitudinal axis (L) from a rear side (B) to a front side (F), wherein the body comprises a main cutting edge on the front side (F), wherein the body comprises a guide bevel, which extends in an axial direction (A) toward the front side (F) along a secondary cutting edge, wherein, toward the front side (F), the guide bevel has an end section which is tapered as a result of a first free surface directly adjacent the guide bevel in the axial direction (A), wherein the drill has a smaller diameter (D) on the first free surface than on the guide bevel, wherein the first free surface comprises two partial surfaces, namely an axial surface, which extends on a side of the body along the end section, and a radial surface, which extends on the front side (F) such that the first free surface as a whole is curved, and wherein the radial surface extends along the main cutting edge and follows the main cutting edge in a direction of rotation (U), the method comprising:
- grinding the end section of the guide bevel such that the axial surface of the first free surface has a width that is constant such that an imaginary boundary line (G) between the guide bevel and the first free surface extends parallel to the guide bevel.
Dependencies are inferred from the claim text.