US 6,164,878 AGranted

Cutting inserts

AssigneeIscar, Ltd.

InventorsAmir Satran, Igor Varshavsky

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Abstract

A cutting insert has an upper surface bounded by a cutting edge, a base, and a peripheral flank surface. The shape of the peripheral flank surface varies along the height of the cutting insert. Near the top of the peripheral flank surface, it conforms to the round or polygonal geometry of the cutting edge so as to provide support for the cutting edge. Lower down the cutting insert, the peripheral flank surface is shaped to provide transverse bearing surfaces which have considerably lower pressure angles, i.e., resistance to turning moments, than would be provided by the inherent geometry of the cutting edge. Preferably, these transverse bearing surfaces are formed by recessed features such as channels, and most preferably, as chevron-type channels. This latter possibility leads to a lower cross-sectional geometry which approximates to an n-pointed star.

Claims23

Dependent claims

A cutting insert having an upper surface bounded by a cutting edge, a base, a peripheral flank surfaces a central axis and an axial clamping bore, wherein said peripheral flank surface includes:

a relief flank surface portion adjacent to, and extending downwards from, said cutting edge, said relief flank surface portion being shaped such that a first cross-section taken through said relief flank surface portion perpendicular to said central axis is bounded by a non-recessed form;
a lower flank surface portion formed such that an outer periphery of a second cross-section taken through the cutting insert perpendicular to said central axis and passing through said lower flank surface portion exhibits n-fold rotational symmetry where n is at least 5, said outer periphery of said second cross-section including recesses corresponding to recessed channels in said lower flank surface for providing abutment surfaces for opposing torque about said central axis;
and a transition flank surface portion located between said relief flank surface portion and said lower flank surface portion, said transition flank surface portion being formed such that a depth of said recessed channels gradually decreases towards said relief flank surface portion.

Dependencies are inferred from the claim text.