| 摘要 |
<p>A cutting insert for a drill of the present invention comprises an upper face having a first side and a second side respectively disposed on both sides of a first corner portion, a bottom face corresponding to the upper face, and a side face located between the upper face and the bottom face. The insert has a first cutting edge formed along the first side, and a second cutting edge formed along the second side. The side face has a first region corresponding to the first cutting edge, a second region corresponding to the second cutting edge, and a third region corresponding to the first corner portion. The third region has an upper region which is adjacent to the first corner portion and disposed toward the upper face, and a lower region located below the upper region. An inclination angle ¸3 of the lower region to the bottom face is larger than each of an inclination angle ¸1 of the first region to the bottom face and an inclination angle ¸2 of the second region to the bottom face. A drill comprising the insert, and a method of cutting using the same are provided.</p> |
