US 9,421,622 B2Granted

Indexable central drill insert and cutting tool therefor

AssigneeIscar, Ltd.

InventorsEden Segev, Mark Kitapov

Life of this patent

Estimating the term…

Loading patent…

Abstract

A central drill insert has a bottom surface, a top surface, and a peripheral surface extending therebetween. At least three lead drill portions protrude outwards from the peripheral surface, each having a drill axis and a plurality of drill cutting edges. A secondary cutting edge is adjacent each lead drill portion, extending along the intersection of the top surface and the peripheral surface, transversely to the respective drill axis. Each secondary cutting edge is spaced apart from the associated drill cutting edges along the drill axis. A dovetail abutment flank is formed on the peripheral surface along the intersection of the top surface and the peripheral surface, extending from each one of the lead drill portions towards the secondary cutting edge associated with another lead drill portion. A cutting tool has an insert pocket for retaining the central drill insert with the operative drill axis aligned with the tool axis.

Claims18

Dependent claims

A central drill insert (100) having rotational symmetry about a central insert axis (I), the central drill insert (100) comprising:

a bottom surface (102) having a bottom plane (P), a top surface (104), and a peripheral surface (106) extending therebetween;
at least three lead drill portions (108) protruding outwards from the peripheral surface (106), each lead drill portion (108) having a drill axis (H) and a plurality of drill cutting edges (110) converging towards the drill axis (H);
at least three secondary cutting edges (112), each adjacent an associated lead drill portion (108), extending along the intersection of the top surface (104) and the peripheral surface (106) transversely to the respective drill axis (H), each secondary cutting edge (112) being axially spaced apart from the drill cutting edges (110) of the respective lead drill portion (108) along the respective drill axis (H);
at least three abutment flanks (116) formed on the peripheral surface (106) along the intersection of the top surface (104) and the peripheral surface (106), each extending from one of the lead drill portions (108) towards the secondary cutting edge (112) associated with another lead drill portion (108), each abutment flank (116) forming a dovetail angle (α) of less than 90° with the bottom plane (P).

1 more element

Dependencies are inferred from the claim text.