Drill bit and process of producing a drill bit with improved cutting edges
AssigneeJohann Eberhard Gesellschaft m.b.H.
InventorHelmut Ebehard
Life of this patent
Estimating the term…
Abstract
The invention relates to a drill, especially a Forstner bit or a multi-spur machine bit having a drill shaft and a cutter head and provided with a central mandrel, a first and second spur cutter radially extending towards the outside from said mandrel and in opposite tool approach directions; a respective hollow cylinder segment wall has a circumference cutter defining the circumference of the cutter head and is joined to the ends of the first and second spur cutter, said ends facing the circumference, wherein the wall defines a chip space facing away from the spur cutter and opening to the respective remaining spur cutter and leading to the drill head, and wherein the two cutters are provided with wave-shaped cavities and elevations at least partially along the sides thereof.
Claims3
A drill bit comprising, a drill stem and a cutter head having a central mandrel, from which a first end cutting edge and a second end cutting edge extend radially outward in opposite in-feed directions, each forming a portion of a cutter head, said each portion of the cutter head is peripherally delimited by a wall in the form of a segment of a hollow cylinder provided with peripheral cutting edges, said segment adjoining peripheral-side ends of the first and second end cutting edges, at an end remote from the end cutting edge is delimiting a chip space opening out toward the other end cutting edge and extending through the drilling head, wherein the two peripheral cutting edges are configured with at least a partial profile of sequences of undulating recesses and elevations.
A process for producing a drill bit, in particular a Forstner bit or a multi-spur machine bit, comprising the steps of providing a hardened blank drill bit with peripheral cutting edges and hard-milling sequences of undulating recesses and elevations into the peripheral cutting edges at least along a portion of a profile of the cutting edges.
Dependencies are inferred from the claim text.