Patent ID: 7281884
Filing Date: 2007-10-16
Classification: B23C,Y10T

Abstract:
1. A throw-away insert comprising: an upper surface; a flat bottom surface with four corners; two side surfaces formed with upper-side side surfaces intersecting with said upper surface and lower-side side surfaces intersecting with said bottom surface; two end surfaces each connected to said upper surface at one end and to said bottom surface at the other end; four nose sections formed at corners of said upper surface; a main cutting section formed from a ridge line positioned at an intersection of said side surface and said upper surface and shaped with a gradual curve when seen from above; a secondary cutting section formed from a ridge line positioned at an intersection of said end surface and said upper surface; and an axial support surface formed from a section of said end surface; wherein: said upper-side side surface is formed as a curved surface with an essentially constant incline angle relative to said bottom surface; said lower-side side surface is formed as a plane with a constant incline angle relative to said bottom surface; said upper-side side surface is projected outward from said lower-side side surface; and said lower-side side surface is formed as a surface at essentially a right angle relative to said axial support surface when viewing the insert perpendicular to the plane of said bottom surface.