Cylindrical bit
AssigneeFamag-Werkzeugfabrik Friedr. Aug. Muhylhoff
InventorThomas Pomp
Life of this patent
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Abstract
A cylindrical bit including a drill head with a centering tip, two circumferential cutters, two main cutting edges extending approximately radialy, and two chip channels associated with main cutting edges. The chip channels are open toward a circumferential surface and toward a rear of the cylindrical bit. To improve chip removal, each chip channel bottom surface is rounded in a curved fashion and blends continuously with the respective chip surfaces of the corresponding main cutting edges and with chip channel side walls opposite the respective chip surfaces.
Claims7
Cylindrical bit machined in one piece from solid material, the cylindrical bit comprising a drill head supported on a shank, said drill head including a centering tip and two circumferential cutters, two main cutting edges extending substantially radially, and two chip channels associated with the main cutting edges, said chip channels opening in a direction of a circumferential surface and a rear face of said drill head, wherein a bottom surface of the respective chip channels is rounded in an arcuate fashion and respectively blends continuously with a chip surface of the respective main cutting edges and with a respective chip channel side wall disposed opposite to the respective chip surfaces, and wherein free surfaces of the respective main respective cutting edges are flat as far as inner walls of the successive circumferential cutters as viewed in a rotational direction of the cylindrical bit, with the respective inner walls sloping continuously in a direction toward a longitudinal center axis of the shank.
Dependencies are inferred from the claim text.