Patent ID: 6164878
Filing Date: 2000-12-26
Classification: B23C,Y10T

Abstract:
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.