Drill

摘要

A drill with a drill flute (12) includes symmetrical fluted lands (20) helically extend around a core, wherein grooves (18) remain between the fluted lands, said grooves having a width (72) that exceeds the spine thickness or width (24) of the fluted lands (20), and wherein the grooves (18) comprise a convex core reinforcement (22) at the groove bottom thereof. The width (24) of the fluted lands (20) at the drill head side end (16) is smaller than at the shank side end (14) of the drill helix (12), and at least increases in certain areas. The core reinforcement (22) at the drill head side end (16) is more convex than at the shank side end (14), thus has larger radii (40, 42).

主权项

1. A drill, said drill comprising:
a drill helix (12) in which symmetrical fluted lands (20) helically extend around a core, wherein grooves (18) remain between the fluted lands, said grooves (18) having a width (72) that exceeds a spine width (24) of the fluted lands (20), and wherein the grooves (18) comprise a convex core reinforcement (22) at the groove bottom thereof, wherein the width (24) of the fluted lands (20) at a drill head side end (16) is smaller than at a shank side end (14) of the drill flute (12) and at least increases in certain areas, and wherein the core reinforcement (22) has a larger cross-section at the drill head side end (16) than at the shank side end (14), in particular has larger radii (40, 42) and is more convex.