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

摘要

A cutting insert having a cutting edge is located along an intersection of the upper surface and the side surface, having a major cutting edge, a second cutting edge, and a minor cutting edge located between the major cutting edge and the flat cutting edge. The upper surface includes a flat part located away from the cutting edge, and a rake face inclined downward from the cutting edge to the flat part. In at least a part between the major cutting edge and the flat part, a groove part lies along the major cutting edge. The groove part includes the rake face and a rising face inclined upward from the rake face to the flat part. A connection part where the rake face and the flat part exist continuously extends from the minor cutting edge to a boundary of the minor cutting edge and the major cutting edge.

主权项

1. A cutting insert, comprising: an upper surface; a lower surface; a side surface connected to the upper surface and the lower surface; and a cutting edge which is located along an intersection of the upper surface and the side surface, and comprises a major cutting edge, a second cutting edge, and a minor cutting edge located between the major cutting edge and the second cutting edge, the second cutting edge inclined upward toward the minor cutting edge, wherein the upper surface comprises a flat part located away from the cutting edge and being perpendicular to a central axis of the cutting insert, and a rake face inclined downward from the cutting edge to the flat part, in at least a part between the major cutting edge and the flat part, a groove part lies along the major cutting edge and comprises the rake face and a rising face, the rising face which is inclined upward from the rake face to the flat part and connects the rake face and the flat part, and a connection part where the rake face and the flat part exist continuously extends from the minor cutting edge to a boundary of the minor cutting edge and the major cutting edge.