Bohrer

Details

Veröffentlichungs-Nr.

EP4810182

Anmeldetag

8. November 2024

Veröffentlichung

22. Mai 2025

Rechtsraum

EP

IPC

B23B51/00, B23B51/02

Abstract

In a drill of the present invention, a thinning edge, a main cutting edge, and a leading edge each have honing (H) of which a cross section perpendicular to each of ridge portions has a convex curve shape, in the cross section, in both end portions (h1), (h2) of the honing H, a surface connected to a first end portion (h1) is defined as a first surface (101), a surface connected to a second end portion (h2) is defined as a second surface (102), a distance from an intersection P between an extension line of the first surface (101) and an extension line of the second surface (102) to the first end portion h1 is defined as a first width dimension (L1), a distance from the intersection P to the second end portion h2 is defined as a second width dimension (L2), [L1/L2] is defined as a width ratio, the thinning edge and the main cutting edge each have the first surface (101) that is a rake face and the second surface (102) that is a flank face, and the width ratio of the thinning edge is larger than the width ratio of a radially outer end portion connected to an outer peripheral corner in the main cutting edge.

Anmelder

Firma

Mitsubishi Materials Corporation

Land

🇯🇵 Japan

Fachgebiete