Drill bit and method for manufacturing
AssigneeKennametal Inc.
InventorsJuergen Schwaegerl, Peter Sollfrank
Life of this patent
Estimating the term…
Abstract
A method for manufacturing a drill bit (1), wherein in a first step the chip flutes (12) are ground into a round rod, in a second step the round rod is ground down to its outer diameter (15, 16) with simultaneous grinding of the drill-bit back (13), and wherein in a third step the drill-bit front (4) is ground, and a drill bit (1) having at least one chip flute (12) and one secondary cutting edge and one drill-bit back (13) adjoining the secondary cutting edge, the drill-bit back (13) sloping downwards as the distance from the secondary cutting edge increases, in order to create a clearance that becomes continuously larger as the distance from the point of intersection (19) of the secondary cutting edge with the drill-bit back (13) increases.
Claims5
A drill bit comprising:
- at least one chip flute,
- a main cutting edge, characterized by a protective land or an edge rounding at the end of the main cutting edge that faces towards an outer envelope of the drill-bit,
- a secondary cutting edge that flanks the chip flute, and
- a drill-bit back that adjoins the secondary cutting edge and extends directly therefrom in an arcuate manner,
- wherein the drill-bit back slopes smoothly downwards as the distance from the secondary cutting edge increases, in order to create a clearance that becomes continuously larger as the distance from the point of intersection of the secondary cutting edge with the drill-bit back increases.
Dependencies are inferred from the claim text.