| CPC B23C 5/109 (2013.01) [B23C 5/202 (2013.01); B23C 2200/0416 (2013.01); B23C 2200/0494 (2013.01); B23C 2200/085 (2013.01); B23C 2200/208 (2013.01); B23C 2200/287 (2022.02); B23C 2200/365 (2013.01)] | 10 Claims |
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1. A cutting insert comprising:
a top surface;
a bottom surface opposite to the top surface;
a side surface contiguous to the top surface and the bottom surface; and
a corner cutting edge, a first cutting edge, a second cutting edge and a third cutting edge formed at a ridge line formed by the side surface and the top surface,
the corner cutting edge having a first end and a second end opposite to the first end in a top view,
the first cutting edge extending from the first end in a first direction in the top view,
the second cutting edge extending from the second end in a second direction intersecting the first direction in the top view,
the third cutting edge extending from the second cutting edge in a third direction forming an acute angle with the second direction in the top view,
the top surface having a first rake face located adjacent to the first cutting edge, a second rake face located adjacent to the second cutting edge, and a third rake face located adjacent to the third cutting edge,
the first, second and third rake faces forming first, second and third rake angles, respectively, with a reference plane parallel to the bottom surface,
the first rake angle being larger than the third rake angle,
the third rake angle being larger than the second rake angle,
the first cutting edge being inclined so as to approach the bottom surface as the first cutting edge is farther away from the first end.
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