CUTTING INSERT, CUTTING TOOL, AND METHOD FOR MANUFACTURING MACHINED PRODUCT

摘要

A cutting insert of one aspect includes a top surface including a first corner portion and a second corner portion; and a top cutting edge. The top cutting edge includes a first corner cutting edge, a first major cutting edge, a second corner cutting edge, and a second major cutting edge. The top surface includes a first breaker protrusion and a second breaker protrusion. A gap between the first breaker protrusion and the first corner cutting edge is larger than a gap between the second breaker protrusion and the second corner cutting edge in a top view, a gap between the first breaker protrusion and the first major cutting edge becomes larger as a distance from the first corner cutting edge increases, and a gap between the second breaker protrusion and the second major cutting edge becomes smaller as a distance from the second corner cutting edge increases.

主权项

1. A cutting insert comprising:
a top surface having a polygonal shape in a top view, and comprising a first corner portion with an acute angle θ1 and a second corner portion with an obtuse angle θ2; a bottom surface; a side surface located between the top surface and the bottom surface; and a top cutting edge disposed along a ridge line at an intersection between the top surface and the side surface, and comprising:
a first corner cutting edge located in the first corner portion;a first major cutting edge adjacent to the first corner cutting edge;a second corner cutting edge located in the second corner portion; anda second major cutting edge adjacent to the second corner cutting edge; wherein the top surface further comprises:
a first breaker protrusion protruding toward the first corner portion; anda second breaker protrusion protruding toward the second corner portion,wherein a gap W1 between the first breaker protrusion and the first corner cutting edge is larger than a gap W2 between the second breaker protrusion and the second corner cutting edge in a top view; andwherein a gap W3 between the first breaker protrusion and the first major cutting edge becomes larger as a distance from the first corner cutting edge increases, and a gap W4 between the second breaker protrusion and the second major cutting edge becomes smaller as a distance from the second corner cutting edge increases in a top view.