Cutting insert and milling tool

A cutting insert for a milling tool, the cutting insert comprising:

• a first side defining a first extension plane;
• a second side opposite to the first side, the second side defining a second extension plane, wherein the first and second extension planes extend in parallel, and wherein a center axis extends perpendicularly through the first and second extension planes;
• a circumferential surface extending between the first side and the second side, the circumferential surface including a first pair of opposing side surfaces and a second pair of opposing side surfaces;
• a median plane extending halfway between the first extension plane and the second extension plane;
• a longitudinal plane extending halfway between the first pair of opposing side surfaces, perpendicularly to the median plane and containing the center axis;
• a central plane extending perpendicularly to both the median plane and the longitudinal plane and containing the center axis;
• a first axis extending along an intersection between the median plane and the longitudinal plane and a second axis extending along an intersection between the median plane and the central plane;
• a first cutting edge extending along an intersection between the first side and the circumferential surface on a first side of the longitudinal plane, the first cutting edge, as seen in a view towards the first side, extending along a corner of the cutting insert;
• a second cutting edge extending along an intersection between the second side and the circumferential surface on the first side of the longitudinal plane, the second cutting edge, as seen in a view towards the second side, extending along a second corner of the cutting insert, wherein
• the first cutting edge includes a first main cutting edge, a first corner cutting edge, and a first auxiliary cutting edge, the first auxiliary cutting edge having a first surface-wiping secondary cutting edge, wherein the first main cutting edge adjoins the first corner cutting edge at a first end of the first main cutting edge, and the first corner cutting edge adjoins the first surface-wiping secondary cutting edge, wherein
• the second cutting edge includes a second main cutting edge, a second corner cutting edge, and a second auxiliary cutting edge, the second auxiliary cutting edge having a second surface-wiping secondary cutting edge, wherein the second main cutting edge adjoins the second corner cutting edge at a first end of the second main cutting edge, and the second corner cutting edge adjoins the second surface-wiping secondary cutting edge;
• as seen in a view along the first axis towards a first side surface of the second pair of opposing side surfaces, a first axial relief face adjacent to the first auxiliary cutting edge and a first axial abutment face form part of a first surface grouping on the first side of the longitudinal plane, wherein the first surface grouping forms part of the circumferential surface;
• and
• as seen in the view along the first axis towards a second side surface of the second pair of opposing side surfaces, a second axial relief face adjacent to the second auxiliary cutting edge and a second axial abutment face form part of a second surface grouping on the first side of the longitudinal plane, wherein the second surface grouping forms part of the circumferential surface, wherein
• the first side surface of the first pair of opposing side surfaces includes a first radial relief face arranged adjacent to the first main cutting edge, wherein as seen in a view along the center axis, at least part of the first radial relief face extends outside of the first main cutting edge at least along a part of the main cutting edge such that the first radial relief face extends more outside the first main cutting edge towards a second end of the first main cutting edge than towards the first end of the main cutting edge, wherein
• as seen in a plane parallel with the longitudinal plane the first axial relief face extends from the first surface-wiping cutting secondary edge at a first inner angle within a range of 91-115 degrees to the median plane, and wherein
• the cutting insert preferably has 180° rotational symmetry with respect to rotation about the second axis, and wherein
• as seen in a plane parallel with the longitudinal plane the second axial relief face extends from the second surface-wiping cutting secondary edge at a second inner angle within a range of 91-115 degrees to the median plane, wherein
• the first axial abutment face forms a substantially flat surface, wherein the first axial abutment face extends perpendicularly to the median plane, wherein the second axial abutment face forms a substantially flat surface, and wherein the second axial abutment face extends perpendicularly to the median plane.