Cutting insert and high feed milling tool

A cutting insert for use in high-feed milling, the cutting insert comprising:

• first and second major faces arranged on opposite sides of the cutting insert and serving as top and bottom faces of the cutting insert;
• a center axis extending between the first and second major faces, wherein the cutting insert has 180° rotational symmetry about the center axis;
• a median plane extending halfway between the first and second major faces, perpendicularly to the center axis;
• a peripheral relief surface extending around the cutting insert between the first and second major faces and including a first main side surface, a second main side surface, a third main side surface, a fourth main side surface, a first corner side surface, a second corner side surface, a third corner side surface and a fourth corner side surface, wherein:
• the first corner side surface is located between the first and second main side surfaces,
• the second corner side surface is located between the second and third main side surfaces,
• the third corner side surface is located between the third and fourth main side surfaces,
• the fourth corner side surface is located between the first and fourth main side surfaces,
• the first and third main side surfaces form a first pair of opposing main side surfaces, and
• the second and fourth main side surfaces form a second pair of opposing main side surfaces;
• a first side cutting edge formed at an intersection between the first main side surface and the first major face;
• a second side cutting edge formed at an intersection between the third main side surface and the first major face;
• a first main cutting edge, a first secondary cutting edge and a first ramping cutting edge formed at an intersection between the second main side surface and the first major face, wherein the first secondary cutting edge is located between the first main cutting edge and the first ramping cutting edge;
• a second main cutting edge, a second secondary cutting edge and a second ramping cutting edge formed at an intersection between the fourth main side surface and the first major face, wherein the second secondary cutting edge is located between the second main cutting edge and the second ramping cutting edge;
• a first curved corner cutting edge formed at an intersection between the first corner side surface and the first major face, wherein the first curved corner cutting edge is located between the first side cutting edge and the first main cutting edge;
• a second curved corner cutting edge formed at an intersection between the second corner side surface and the first major face, wherein the second curved corner cutting edge is located between the first ramping cutting edge and the second side cutting edge;
• a third curved corner cutting edge formed at an intersection between the third corner side surface and the first major face, wherein the third curved corner cutting edge is located between the second side cutting edge and the second main cutting edge;
• and
• a fourth curved corner cutting edge formed at an intersection between the fourth corner side surface and the first major face, wherein the fourth curved corner cutting edge is located between the second ramping cutting edge and the first side cutting edge,
• wherein a shortest distance between the opposing first and second main cutting edges is equal to or larger than a shortest distance between the opposing first and second side cutting edges,
• wherein the first main cutting edge has a first end connected to the first secondary cutting edge and a second end connected to the first curved corner cutting edge, and the second main cutting edge has a first end connected to the second secondary cutting edge and a second end connected to the third curved corner cutting edge, each one of the first and second main cutting edges having one or more sloping parts between the first and second ends with such slope or slopes that the second end is located closer to the median plane than the first end,
• wherein the first ramping cutting edge has a first end connected to the first secondary cutting edge and a second end connected to the second curved corner cutting edge, and the second ramping cutting edge has a first end connected to the second secondary cutting edge and a second end connected to the fourth curved corner cutting edge, each one of the first and second ramping cutting edges having one or more sloping parts between the first and second ends with such slope or slopes that the second end is located closer to the median plane than the first end, and
• wherein the first main cutting edge and the first ramping cutting edge extend at an obtuse angle in relation to each other as seen in a plan view of the cutting insert as seen along the center axis toward the first major face, the second main cutting edge and the second ramping cutting edge extending at a corresponding obtuse angle in relation to each other as seen in the plan view of the cutting insert,
• wherein the second end of each one of the first and second main cutting edges is located closer to the median plane than the second end of each one of the first and second ramping cutting edges.