Triangular cutting insert and cutting tool

A reversible indexable triangular cutting insert (100), comprising:

• first and second parallel bounding planes (P1, P2) between which the cutting insert is located, and a midplane (M) extending parallel to, and located midway between, the bounding planes (P1, P2), with an insert center axis (G), passing through the insert triangle geometric center and extending perpendicular to the midplane (M);
• a first surface (102) and a second surface (104), each of the first and second surfaces (102, 104) including at least one insert abutment portion (108);
• a bore (110) passing through, and opening out to at least one of the first and second surfaces (102, 104);
• a peripheral surface (106) extending between the first and second surfaces (102, 104), the peripheral surface (106) including three peripheral relief flanks (114) alternating with three peripheral corners (116), the peripheral surface (106) intersecting with each of the first and second surface (102, 104), at an insert edge (117), each insert edge (117) including three edge portions (119), each edge portion (119) comprising:
• a major cutting edge (118), formed at the intersection of each peripheral relief flank (114) with one of the first and second surfaces (102, 104);
• a wiper corner (122), coupled with the major cutting edge (118), the wiper corner (122) having a bisector (B, B1) bisecting the wiper corner (122) and intersecting with the insert center axis (G);
• and
• a transitional slope (120) coupled with, and extending from, the wiper corner (122) towards the midplane (M);
• each wiper corner (122) further comprises:
• a wiper portion (124), coupled with the associated major cutting edge (118), the wiper portion (124) included in an associated bounding plane (P1, P2);
• and
• a secondary slope (126) extending between the wiper portion (124) and the transitional slope (120), in the direction of the midplane (M);
• wherein:
• viewed along the insert center axis (G) in a plan view, a footprint of the insert exhibits mirror symmetry relative to each one of the bisectors (B, B1), and the contour of each major cutting edge (118) is substantially perpendicular to the contour of the associated secondary slope (126),
• viewed perpendicular to one of the bisectors (B, B1) in a side view, the peripheral relief flank (114) perpendicular to that bisector (B, B1) is located in an insert peripheral plane (P3), and the transitional slope (120) coupled with that peripheral relief flank (114) is located between the insert peripheral plane (P3) and the insert center axis (G), and
• viewed along one of the bisectors (B, B1) in a front view, each of the major cutting edges (118) adjacent to that bisector (B, B1) forms a first angle (α) with the associated bounding plane (P1, P2).