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

A cutting insert, comprising:

• an upper surface;
• a lower surface;
• a side surface located between the upper surface and the lower surface;
• at least one concave part extending in a thickness direction in the side surface, and comprising one end thereof located at the upper surface;
• and
• a cutting edge which is located at an intersection region of the upper surface and the side surface, and is divided into a plurality of divided cutting edges with the at least one concave part interposed therebetween, wherein
• the upper surface comprises
• a first raised part located inwardly of the at least one concave part, and
• a plurality of second raised parts respectively located inwardly of the plurality of divided cutting edges, and
• the plurality of the second raised parts are located inward compared to one end of the first raised part closer to the cutting edge in a top view, and
• upper portions of the plurality of second raised parts each extends along a direction perpendicular to the cutting edge.

A cutting insert, comprising:

• an upper surface;
• a lower surface;
• a side surface located between the upper surface and the lower surface;
• at least one concave part extending in a thickness direction in the side surface, and comprising one end thereof located at the upper surface;
• and
• a cutting edge which is located at an intersection region of the upper surface and the side surface, and is divided into a plurality of divided cutting edges with the at least one concave part interposed therebetween, wherein
• the upper surface comprises
• a first raised part located inwardly of the at least one concave part, and
• a plurality of second raised parts respectively located inwardly of the plurality of divided cutting edges, and
• the plurality of the second raised parts are located inward compared to one end of the first raised part closer to the cutting edge in a top view, each of the plurality the second raised parts comprises
• a first edge portion located closer to the cutting edge, and
• a second edge portion located opposite the first edge portion, and
• the first edge portion and the second edge portion each has a convex shape toward the cutting edge in a top view.