Cutting insert and face milling cutter

A cutting insert for removable installation in a tool body, the cutting insert comprising:

• a first surface with a rake face formed thereon;
• a second surface located opposite the first surface;
• a peripheral side surface extending between the first surface and the second surface and comprising a relief face formed thereon and having a positive relief angle;
• and
• a cutting edge formed at an intersection of the rake face and the relief face,
• wherein the relief face is formed in association with a given corner of the cutting insert and comprises a major relief face, a first minor relief face, and an intermediate relief face extending between the major relief face and the first minor relief face,
• the cutting edge comprises a major cutting edge formed at an intersection of the major relief face and the rake face, a first minor cutting edge formed at an intersection of the first minor relief face and the rake face, and an intermediate cutting edge formed at an intersection of the intermediate relief face and the rake face and linked to the major cutting edge and the first minor cutting edge, and
• the intermediate relief face includes a protruding curved relief face extending from the first surface to the second surface,
• the intersection of the curved relief face and the rake face has a predetermined radius of curvature which is substantially the same as a radius of curvature at the intersection of the curved relief face and the second surface, and
• the intermediate relief face comprises a chamfered corner relief face extending between the curved relief face and the major relief face, and an intersection of the curved relief face and the first surface is linked to an intersection of the first minor relief face and the first surface and to an intersection of the chamfered corner relief face and the first surface.