Cutting insert, especially for milling operations

Claim 1

A cutting insert comprising a body of hard wear resistant material having parallel top and bottom faces and a peripheral wall perpendicular to said top and bottom faces, said body being polygonal when viewed in a direction perpendicular to said faces, whereby said peripheral wall is in the form of flat side walls which meet at the corners of the insert and which intersect the top and bottom faces of the insert to form edges on the insert, said corners of the insert being rounded, at least one recess in one of said top and bottom faces extending from a point near a respective corner of the insert along a respective edge of the insert, said recess widening in a direction away from said respective corner and having a first bottom wall inclining downwardly away from the respective edge of the insert and second bottom wall portion extending upwardly from the lower edge of said first bottom wall portion to said plane, both of said first and second bottom wall portions forming skewed planes each making an ever increasing included angle with the plane of the respective face in a direction away from the respective corner of the insert, and said recess comprising an end wall portion on the end thereof remote from said respective corner and extending from the adjacent ends of said first and second bottom wall portions upwardly to said plane.