| 摘要 |
<p>To reduce burrs that may be formed at a corner portion of a machined surface in a face milling process, there is provided a cutting insert that does not tend to form burrs. A milling cutting insert includes cutting edges 5 provided as ridges each defined by an upper or lower face 2 or 4 and a side face 3 that intersect each other, the cutting edges including a flat cutting edge 5b. The cutting edges 5 include a major cutting edge 5a provided between adjacent ones of corner portions, the flat cutting edge 5b provided at the corner portion, and a minor cutting edge 5c provided between the major cutting edge and the flat cutting edge. A surface roughness of a side face 3a that is continuous with the major cutting edge 5a is higher than a surface roughness of a side face 3c that is continuous with the minor cutting edge 5c.</p> |
