Importance

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Abstract

A milling tool includes a holder rotatable about an axis and carrying a plurality of cutting inserts at a forward end thereof. Each insert includes a plurality of main cutting edges, and secondary cutting edges disposed on protruding corners of the insert. Each main cutting insert has a clearance surface located therebehind considered with reference to a direction of rotation of the holder. Each clearance surface has surface portion defining a convex profile, the convex profile forming a crest or transition. During a cutting operation, one of the main cutting edges constitutes an axially forwardmost inactive cutting edge. The transition of the clearance surface associated with that inactive edge is disposed axially forwardly with respect to the inactive cutting edge to prevent the inactive cutting edge from impacting against a workpiece.

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First Claim