Bohrer

Details

Veröffentlichungs-Nr.

EP4778655

Anmeldetag

6. September 2024

Veröffentlichung

20. März 2025

Rechtsraum

EP

IPC

B23B51/00

Abstract

A drill (1) includes: a shaft-shaped tool main body (10) that is rotated about a central axis, the drill (1) having a chip discharge flute (14) formed on an outer periphery of the tool main body (10), and a cutting edge (15) formed at an intersection ridge portion between a tip flank face (13) and the chip discharge flute (14) of the tool main body (10). The tool main body (10) has a substrate and a hard coating (17) formed in a region of a predetermined length from a tip of the substrate. The chip discharge flute (14) has, in a central axis direction, a first section (S1) having a first surface roughness and a second section (S2) that is positioned closer to a posterior end side than the first section (S1) and that has a second surface roughness smaller than the first surface roughness, the first section (S1) and the second section (S2) being arranged in order from a tip of the tool main body (10). The first section (S1) has a length of at least 0.5 times a tool diameter (D). The hard coating (17) is formed in the first section (S1), and the hard coating (S17) is not formed in the second section (S2).

Anmelder

Firma

Mitsubishi Materials Corporation

Land

🇯🇵 Japan

Fachgebiete