Abstract:
A cutting insert (25) includes two supporting surfaces (41), four side surfaces (47) between the two supporting surfaces (41), each side surface (47) of the four side surfaces intersecting with two other side surfaces of the four side surfaces to form four corners (67), the four side surfaces (47) intersecting with the two supporting surfaces (41) to form, at two of the four corners (67), four cutting corners (49), each cutting corner including a first and a second cutting edge component (51 and 53), and to form, at two other ones of the four corners, four non-cutting corners. Each supporting surface (41) includes a surface portion (43) and an angled supporting surface (45), a plane of the angled supporting surface intersecting with a plane (PSS) of the surface portion(43) along a line of intersection and forming a non-zero angle (β') with the plane (PSS) of the surface portion (43), wherein the line of intersection on a first one of the two supporting surfaces (41) is substantially perpendicular to the line of intersection on a second one of the two supporting surfaces (41). A toolholder and a cutting tool are also disclosed.
Abstract:
A triangular cutting insert (100) has first and second surfaces(102, 104), a midplane (M), a peripheral surface(106), with an insert center axis (G). The peripheral surface (106) has alternating relief flanks (114) and corners (116). A major cutting edge (118) formed between each relief flank (114) and the first and second surfaces (102, 104), connects at a corner to a wiper edge included in a bounding plane (PI, P2) of the insert (100). The wiper edge further connects to a transitional slope (120) directed toward the midplane (M) and an adjacent major cutting edge (118). Viewed along the insert center axis (G), an insert footprint is symmetrical to each corner bisector (B), and each major cutting edge (118) is perpendicular to the associated secondary slope (126). Viewed perpendicular to the bisector (B), the relief flank (114) is in a peripheral plane (P3), and the transitional slope (120) is between the peripheral plane (P3) and the insert center axis (G). Viewed along the comer bisector (B), each visible major cutting edge (118) forms a first angle (a) with the bounding plane (P1, P2).