| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting insert (1) which includes a cutting edge having an involute-curve approximate shape.SOLUTION: A cutting edge (18) is formed so as to wholly take on a first curved shape with a first curvature radius when the cutting insert is viewed from the end surface, and is formed such that a large part of the cutting edge takes on a second curved shape with a second curvature radius when the cutting insert is viewed from the side surface.SELECTED DRAWING: Figure 2 |
