Patent ID: 6764254
Filing Date: 2004-07-20
Classification: B23C,Y10T

Abstract:
A reversible throwaway insert for a pin mirror cutter, said insert being a negative insert comprising:an opposed pair of substantially parallelogrammic top and bottom faces each having an opposed pair of acute angled corners and an opposed pair of obtuse angled corners as viewed from a first direction which is perpendicular to a plane containing said top or bottom face; an opposed pair of first side faces; an opposed pair of second side faces; each of said first side faces being formed by one of a curved surface, a combination of flat surfaces connected to each other at an angle, and a combination of a flat surface and a curved surface so as to protrude, as viewed from said first direction, from an imaginary straight line connecting said acute corner and said obtuse corner at both ends of said each first side face; each of said second side faces having four corners, each of said four corners of each said second side face rounded with a predetermined radius of curvature as viewed from a second direction which is perpendicular to a plane containing one of said second side faces, each of said four corners of each of said second side faces forming a cutting edge; one of said first side faces being disposed between and separating two adjacent ones of said four rounded corners of each of said second side faces from each other; and the other of said first side faces being disposed between and separating the other two adjacent ones of said four rounded corners of said each of said second side faces from each other.