CUTTING INSERT, CUTTING TOOL, AND METHOD OF PRODUCING MACHINED PRODUCT

摘要

A cutting insert includes an upper surface, a lower surface, a side surface, and an upper cutting edge. The upper cutting edge includes a major cutting edge having an outwardly projecting curvilinear shape, and a minor cutting edge having a straight line shape and being continuous with the major cutting edge. The side surface includes a continuous inclined surface with the major cutting edge and is inclined outward from the upper surface to the lower surface with respect to a virtual straight line connecting the respective centers of the upper and lower surfaces. An inclination angle of the inclined surface with respect to a virtual straight line on the side surface increases from a portion of the inclined surface which is continuous with an end portion of the major cutting edge to a portion of the inclined surface which is continuous with a center of the major cutting edge.

主权项

1. A cutting insert, comprising:
a lower surface; an upper surface; a side surface connected to each of the lower surface and the upper surface; and an upper cutting edge located along an intersection of the upper surface and the side surface, wherein the upper cutting edge comprises a first major cutting edge having an outwardly projecting curvilinear shape, and a first minor cutting edge having a straight line shape and being continuous with the first major cutting edge, wherein the side surface comprises a first inclined surface that is continuous with the first major cutting edge and is inclined further outward as going from the upper surface to the lower surface with respect to a virtual straight line connecting a center of the upper surface and a center of the lower surface, and a first parallel surface that is continuous with the first minor cutting edge and is parallel to the virtual straight line, and wherein an inclination angle of the first inclined surface with respect to the virtual straight line on the side surface increases as going from a portion of the first inclined surface which is continuous with an end portion of the first major cutting edge to a portion of the first inclined surface which is continuous with a center of the first major cutting edge.