Negative finish turning insert with chip forming arrangement

A cemented carbide turning insert comprising:

• opposite first and second surfaces;
• a peripherally extending peripheral surface connecting and extending perpendicular to the first and second surfaces;
• a peripheral edge formed at an intersection of the peripheral surface and the first surface, the peripheral edge having at least one corner comprising a corner radius;
• a cutting edge formed along at least a portion of the peripheral edge, and extending along the corner radius as well as first and second edge portions connected to and extending from different sides of the corner;
• a bisector plane P1 perpendicular to the first and second surfaces and bisecting the corner radius;
• a bisector point P defined at an intersection of the cutting edge and the bisector plane;
• a horizontal plane perpendicular to the peripheral surface and intersecting the bisector point;
• a downward direction directed perpendicularly from the horizontal plane towards the second surface;
• an upward direction opposite to the downward direction;
• an inward direction directed into the insert from an intersection of the bisector plane and the peripheral surface;
• and
• a chip forming arrangement formed at the first surface, adjacent to the cutting edge, the chip forming arrangement being devoid of a land and consisting of a single, continuous v-shaped groove extending on both sides of the corner radius, in a top view;
• the groove comprising:
• a curved groove portion adjacent the corner radius, and two straight extension portions connected to either side of the curved groove portion;
• a descending surface extending directly from the cutting edge in a downward-inward direction to a lowest point of the groove;
• and
• an ascending surface extending from the lowest point in an upward-inward direction to a highest point;
• wherein along the bisector plane:
• the lowest point is a first horizontal distance D1 from the bisector point, fulfilling the condition 0.50 mm≤D1≤1.20 mm;
• the lowest point is a first vertical distance H1 downward from the horizontal plane, fulfilling the condition 0.15 mm≤H1≤0.30 mm;
• and
• the highest point is a second horizontal distance D2 from the bisector point, fulfilling the condition 1.10 mm≤D2≤1.70 mm.