Spiralbohrer und Austauschbarer Kopf für einen Spiralbohrer

Details

Veröffentlichungs-Nr.

EP3342515

Aktenzeichen

EP16207128

Anmeldetag

28. Dezember 2016

Veröffentlichung

23. November 2022

Erteilung

23. November 2022

Rechtsraum

EP

IPC

B23B51/02B23B51/06

Abstract

A twist drill (1) and an exchangeable head for a twist drill extending along a central axis (C) of rotation and having a front end (2) formed as a drill point with two cutting edges (10) and at least two clearance surfaces (15), wherein two helical chip flutes (7) configured for conducting chips away from the cutting edges extend rearward from the front end, wherein each cutting edge extends in a transition between at least one of the clearance surfaces and one of the chip flutes. Each cutting edge has a curved shape and extends from an inner position adjacent to the central axis to a peripheral envelope surface (6) and has a main portion (11) closest to the peripheral envelope surface. Each chip flute is delimited by a side surface (22) including a main rake face (14), which extends rearward from the main portion of the cutting edge. The main rake face has a concave shape as seen in a transverse cross section, and the cutting edges are contained in an imaginary conical surface, such that the twist drill is operable to generate a bottom profile having the shape of an inverted cone.

Anmelder

Firma

Seco Tools AB

Land

🇸🇪 Schweden

Fachgebiete