Cutting insert having a limited number of frame faces

An indexable cutting insert, comprising an anterior layer cutting head portion and a posterior layer portion, wherein:

• the anterior layer cutting head portion comprises:
• an anterior face, and
• mutually inclined lateral faces extending transversally to the anterior face and joining each anterior face,
• wherein the mutually inclined lateral faces delimit, together with the anterior face, a front view profile formed by a certain number of cutting edges mutually inclined in the direction of said profile, the mutually inclined lateral faces joining the anterior face at the cutting edges and the cutting edges being located substantially in a same plane,
• the posterior layer portion constitutes an anchoring base for anchoring the indexable cutting insert on a tool holder, the posterior layer portion comprising:
• a substantially planar posterior face for supporting the indexable cutting insert on a bottom of a seat of the tool holder, the posterior face being delimited by four edges;
• and
• four lateral framing supporting faces for supporting the indexable cutting
• insert on walls of the seat of the tool holder, each of the four lateral framing supporting faces being substantially planar and each of the four lateral framing supporting faces extending transversally to the posterior face and joining a respective one of the four edges delimiting the posterior face;
• the number of cutting edges is greater than four, and
• the cutting edges define cutting noses, each cutting nose protruding with respect to a respective one of the four lateral framing supporting faces.

Assembly, comprising:

• a tool holder having a longitudinal axis,
• at least one indexable cutting insert, comprising an anterior layer cutting head portion and a posterior layer portion, wherein:
• the anterior layer cutting head portion comprises:
• an anterior face, and
• mutually inclined lateral faces extending transversally to the anterior face and joining each anterior face,
• wherein the mutually inclined lateral faces delimit, together with the anterior face, a front view profile formed by a certain number of cutting edges mutually inclined in the direction of said profile, the mutually inclined lateral faces joining the anterior face at the cutting edges and the cutting edges being located substantially in a same plane,
• the posterior layer portion constitutes an anchoring base by which the indexable cutting insert is anchored on the tool holder, the posterior layer portion comprising:
• a posterior face by which the indexable cutting insert is supported on a bottom of a seat of the tool holder, and
• lateral framing supporting faces extending transversally to the posterior face and joining each posterior face, the indexable cutting insert being supported on walls of the seat of the tool holder by some of the lateral framing supporting faces,
• the number of said lateral framing supporting faces is smaller than the number of cutting edges, and
• the cutting edges define cutting noses, each cutting nose protruding with respect to a respective one of the lateral framing supporting faces, and
• insert clamping means which are associated to the bottom of the seat of the tool holder, the indexable cutting insert being clamped on the tool holder by the insert clamping means, wherein one of said cutting noses protrudes axially from the tool holder.