Cutting insert, cutting tool, and method of manufacturing machined product using them

摘要

A cutting insert includes an upper surface; a lower surface; a side surface which is connected to each of the upper surface and the lower surface and includes a first side surface, a second side surface and a third side surface being adjacent to each other in order; an upper cutting edge including an upper major cutting edge located at an intersection of the upper surface and the first side surface, and an upper flat cutting edge located closer to the upper major cutting edge in an intersection of the upper surface and the second side surface; and a lower cutting edge including a lower major cutting edge located at an intersection of the lower surface and the third side surface, and a lower flat cutting edge located closer to the lower major cutting edge in an intersection of the lower surface and the second side surface. The second side surface comprises an upper flank surface connected to the upper flat cutting edge, and a lower flank surface connected to the lower flat cutting edge. As going from the upper surface to the lower surface, the upper flank surface is closer to a central axis extending between the upper surface and the lower surface and the lower flank surface is separated from the central axis in a side sectional view. A cutting tool including the cutting insert, and a method of manufacturing a machined product by using the cutting tool are also provided.

主权项

1. A cutting insert, comprising:
an upper surface;
a lower surface;a side surface which is connected to each of the upper surface and the lower surface and comprises a first side surface, a second side surface and a third side surface being adjacent to each other in order;an upper cutting edge comprising an upper major cutting edge located at an intersection of the upper surface and the first side surface, and an upper flat cutting edge located closer to the upper major cutting edge in an intersection of the upper surface and the second side surface; anda lower cutting edge comprising a lower major cutting edge located at an intersection of the lower surface and the third side surface, and a lower flat cutting edge located closer to the lower major cutting edge in an intersection of the lower surface and the second side surface, whereinthe second side surface comprises an upper flank surface connected to the upper flat cutting edge, and a lower flank surface connected to the lower flat cutting edge, andas going from the upper surface to the lower surface, the upper flank surface is closer to a central axis extending between the upper surface and the lower surface and the lower flank surface is separated from the central axis in a side sectional view.