Insert, cutting tool, and method of manufacturing machined product using them

摘要

An insert according to an embodiment of the present invention includes an upper surface, a lower surface, a side surface which is connected to the upper surface and the lower surface, and includes a first side surface, and a cutting edge which is located an intersection of the upper surface and the side surface, and comprises a first cutting edge corresponding to the first side surface. The first cutting edge has a projected shape projected toward the upper surface in a side view, and has a recessed shape recessed inward in a top view. A cutting tool according to an embodiment of the present invention includes the insert and a holder configured to attach the insert thereto so that at least a part of the first cutting edge has a negative axial rake angle. A method of manufacturing a machined product according to an embodiment of the present invention is a method of manufacturing the machined product by using the cutting tool.

主权项

1. An insert, comprising:
an upper surface; a lower surface; a side surface which is connected to the upper surface and the lower surface, and comprises a first side surface; and a cutting edge which is located at an intersection of the upper surface and the side surface, and comprises a first cutting edge corresponding to the first side surface, wherein the first cutting edge has a projected shape projected toward the upper surface in a side view, and has a recessed shape recessed inward in a top view wherein the first cutting edge comprises a linear part, and a convex curved part which is connected to the linear part and is a curved line projected toward the upper surface in the side view, wherein the linear part is perpendicular to a central axis extending between the upper and lower surfaces of the insert.