Patent ID: 7384218

Claim:
A clamping mechanism for clamping a cutting insert, comprising: a holder having first and second contacting surfaces which face each other, the first and second contacting surfaces having inclined planes to form a convex V-shape; an insert mounting seat for receiving the cutting insert, the insert mounting seat being formed at a tip of the holder; and the cutting insert comprising: a first contact surface forming at least a portion of the upper surface of the cutting insert, and a second contact surface forming at least a portion of the bottom surface of the cutting insert, which respectively contact the first and second contacting surfaces of the holder, the first and second contact surfaces each having cross-sectional convex surfaces comprising a left lateral face and a right lateral face; and a first concave recess at the junction of the left lateral face and right lateral face of the first contact surface, and a second concave recess at the junction of the left lateral face and right lateral face of the second contact surface, wherein the inclined planes and the convex surfaces contact each other at a first set of respective contacting positions.