Patent ID: 7374372

Claim:
A polygonal indexable insert, comprising: a flat locating surface and cutting edges on a top side connected to one another by two or more cutting corners having acute angles of less than 89° and obtuse angles of more than 91° following one another alternately, said cutting edges running rectilinearly or curved relative to said flat locating surface to define a thickness d of the indexable insert at said cutting corners having an acute angle greater than a thickness d′ of the indexable insert at said cutting corners having an obtuse angle; in a plan view, said cutting edges merging into a rake face which, with respect to said flat locating surface, first falls inward and then rises with a slope region and then forms an intersection curve together with a center part of the indexable insert, said intersection curve running at a distance a from a starting point of the associated said cutting edge in a region of said cutting corners having the acute angle in each case at their intersection with the angle bisector and at a distance b from an end point of the associated said cutting edge in the region of said cutting corners having the obtuse angle in each case at their intersection with the angle bisector, the distance b being greater than the distance a; an imaginary straight connecting line between said intersections, if the associated said cutting edge runs rectilinearly in a plane perpendicular to said flat locating surface, having a maximum angular deviation of 5° from said cutting edge in said plane or, if the associated said cutting edge runs in a curved manner in said plane perpendicular to said flat locating surface, having a maximum angular deviation of 5° from an imaginary straight connecting line of said starting point and said end point of said cutting edge in said plane; and wherein said intersection, with respect to said flat locating surface, lies at an equal height as said starting point of said cutting edge or lies deeper than said starting point by no more than a maximum of 6% of a length of the associated said cutting edge.