Patent ID: 6503028
Filing Date: 2003-01-07
Classification: B23C,Y10T

Abstract:
Indexible cutting insert for chip forming machining, comprising a basically parallelogram shaped body formed of sintered powder, the body including:a top face forming two main cutting edges, each main cutting edge being convex as the insert is viewed in a direction perpendicular to the top surface; a bottom face; two longitudinal side surfaces extending downwardly relative to respective main cutting edges; two end faces spaced apart in a longitudinal direction of the insert, each end face having a bevel provided on a portion of the body protruding in the longitudinal direction from the remainder of the body; each of the side surfaces having a height increasing toward a respective active cutting corner of the insert such that the active cutting corner is raised with respect to an opposite end of the respective side surface, the side surfaces being generally inclined at an acute angle toward the top face and at an obtuse angle toward the bottom face, an upper portion of each of the side surfaces comprising a wave-shaped primary clearance surface extending along the entire respective main cutting edge at a downward inclination to form a clearance angle; a center hole extending completely through the body from the top face to the bottom face and including a cylindrical portion adapted to receive a threaded shank of a clamp screw, the center hole further including an enlarged portion adjacent the top face; a lower region of each longitudinal side surface defining an abutment surface adapted to engage a support surface of an insert site of a holder, the lower region including a recess extending to the bottom surface and extending in the longitudinal direction for a distance longer than a diameter of the cylindrical portion of the center hole, wherein the recess extends beyond the entire cylindrical portion in the longitudinal direction of the insert as the insert is viewed in a direction toward the side surfaces.