Patent ID: 8992134
Filing Date: 2015-03-31
Classification: B23C,Y10T

Abstract:
1. A cutting insert formed like a plate and comprising a seating surface and a cutting edge formed thereon, the seating surface formed like a plate and serving as an abutting surface when the cutting insert is attached to a tool main body, the cutting edge being formed at a crossing edge line portion between a rake face and a flank face provided on a side surface of the plate, wherein the plate includes an upper surface with a first rake face and a second seating surface formed thereon and a lower surface with a second rake face and a first seating surface formed thereon, the cutting edge comprises a substantially circular-arc-shaped first cutting edge portion formed at a crossing edge line portion between the first rake face formed on the upper surface of the plate and a first flank face portion formed on the side surface of the plate, and a substantially circular-arc-shaped second cutting edge portion formed at a crossing edge line portion between the second rake face formed on the lower surface of the plate and a second flank face portion formed on the side surface of the plate, between the upper surface and lower surface of the plate, the substantially circular-arc-shaped first cutting edge portion and a crossing edge line portion between the first seating surface and the first flank face portion are positioned opposite each other, and between the upper surface and lower surface of the plate, the substantially circular-arc-shaped second cutting edge portion and a crossing edge line portion between the second seating surface and the second flank face portion are positioned opposite each other.