Cutting insert having two peripheral abutment ridges and cutting tool

A replaceable cutting insert (22) having an insert longitudinal axis (A) defining opposite forward and rear directions (DF, DR) and further having an insert axial plane (P) containing the insert longitudinal axis (A), the cutting insert (22) comprising:

• opposing insert inner and outer side surfaces (28, 30) and an insert peripheral surface (32) extending therebetween, the insert peripheral surface (32) comprising opposing insert front and rear end surfaces (34, 36) and opposing insert upper and lower surfaces (38, 40) connecting the insert front and rear end surfaces (34, 36);
• a cutting portion (42) comprising a primary cutting edge (48) formed at the intersection of the insert front end surface (34) and the insert upper surface (38);
• and
• a mounting portion (44), connected to the cutting portion (42), and comprising:
• two spaced apart peripheral abutment ridges (58, 60), distal the insert outer side surface (30), and extending along the insert rear end surface (36) and the insert lower surface (40), respectively, and converging towards each other at an acute insert wedge angle (θ) in a rearward direction (DR) of the cutting insert (22), away from the primary cutting edge (48);
• wherein:
• the insert inner side surface (28) at the mounting portion (44) comprises three spaced apart insert projections (54) protruding therefrom, each insert projection (54) comprising an inner side abutment surface (56), the inner side abutment surfaces (56) being co-planar with each other.

A cutting tool (20) comprising, in combination:

• an insert holder (24), having a holder longitudinal axis (B);
• and
• a replaceable cutting insert (22), removably attached to the insert holder (24) by a fastening member (88),
• wherein the cutting insert comprises:
• an insert longitudinal axis (A) defining opposite forward and rear directions (DF, DR) and further having an insert axial plane (P) containing the insert longitudinal axis (A);
• opposing insert inner and outer side surfaces (28, 30) and an insert peripheral surface (32) extending therebetween, the insert peripheral surface (32) comprising opposing insert front and rear end surfaces (34, 36) and opposing insert upper and lower surfaces (38, 40) connecting the insert front and rear end surfaces (34, 36);
• a cutting portion (42) comprising a primary cutting edge (48) formed at the intersection of the insert front end surface (34) and the insert upper surface (38);
• a mounting portion (44), connected to the cutting portion (42), and comprising:
• two spaced apart peripheral abutment ridges (58, 60), distal the insert outer side surface (30), and extending along the insert rear end surface (36) and the insert lower surface (40), respectively, and converging towards each other at an acute insert wedge angle (θ) in a rearward direction (DR) of the cutting insert (22), away from the primary cutting edge (48);
• the insert inner side surface (28) at the mounting portion (44) comprising three spaced apart insert projections (54) protruding therefrom, each insert projection (54) comprising an inner side abutment surface (56);
• and
• the two peripheral abutment ridges (58, 60) comprising a rear peripheral abutment ridge (58) located on the insert rear end surface (36) and a lower peripheral abutment ridge (60) located on the insert lower surface (40);
• wherein the insert holder (24) comprises:
• a holder forward end surface (70) and a holder peripheral surface (72) forming a circumferential boundary thereof;
• and
• an insert pocket (26) recessed in the holder peripheral surface (72) and comprising:
• a pocket opening (74) that opens out to the holder forward end surface (70);
• and
• a pocket base surface (76) and a pocket peripheral wall surface (78) oriented substantially perpendicularly to the pocket base surface (76), the pocket base surface (76) comprising a pocket side abutment surface (80), and the pocket peripheral wall surface (78) comprising pocket rear and lower abutment surfaces (84, 86) that slope outwardly in a direction from the holder peripheral surface (72) towards the pocket base surface (86) and converge towards each other at an acute pocket wedge angle (μ) in a direction away from the pocket opening (74);
• wherein in an assembled position of the cutting tool (20):
• the pocket lower abutment surface (86) abuts the lower peripheral abutment ridge (60), the pocket rear abutment surface (84) abuts the rear peripheral abutment ridge (58) and the pocket side abutment surface (80) abuts the insert inner side surface (28).