Patent ID: 8573905

Claim:
A reversible indexable triangular cutting insert ( 100 ), comprising: first and second parallel bounding planes (P 1 , P 2 ) between which the cutting insert is located, and a midplane (M) extending parallel to, and located midway between, the bounding planes (P 1 , P 2 ), 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, B 1 ) 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 (P 1 , P 2 ); 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, B 1 ), 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, B 1 ) in a side view, the peripheral relief flank ( 114 ) perpendicular to that bisector (B, B 1 ) is located in an insert peripheral plane (P 3 ), and the transitional slope ( 120 ) coupled with that peripheral relief flank ( 114 ) is located between the insert peripheral plane (P 3 ) and the insert center axis (G), and viewed along one of the bisectors (B, B 1 ) in a front view, each of the major cutting edges ( 118 ) adjacent to that bisector (B, B 1 ) forms a first angle (α) with the associated bounding plane (P 1 , P 2 ).