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

摘要

A cutting insert includes an upper surface, a side surface having a front clearance surface, and an end cutting edge along an intersection of the upper and the front clearance surfaces. The upper surface includes an end rake surface inclined downward as departing from the end cutting edge, a pair of front protrusions that is located apart from the end cutting edge and are less apart from each other as departing from the end cutting edge, a rear protrusion further apart from the end cutting edge than the pair of front protrusions, and a pair of intermediate protrusions located between the front protrusions and the rear protrusion. Top portions of the pair of intermediate protrusions are respectively located between the front protrusions and the rear protrusion, and are higher than top portions of the front protrusions and a top portion of the rear protrusion.

主权项

1. A cutting insert, comprising:
an upper surface; a side surface comprising a front clearance surface and a pair of side clearance surfaces adjacent to the front clearance surface; and an end cutting edge located along an intersection of the upper surface and the front clearance surface, wherein the upper surface comprises
an end rake surface that is continuous with the end cutting edge and is inclined downward as departing from the end cutting edge,a pair of front protrusions that is located apart from the end cutting edge and are less apart from each other as departing from the end cutting edge in a top view,a rear protrusion which is further apart from the end cutting edge than the pair of front protrusions in the top view, and which is located in a region between the pair of front protrusions in a side view taken from the front clearance surface, the rear protrusion comprising an ascent portion inclined upward as departing from the end cutting edge, anda pair of intermediate protrusions that is at least partially located between the pair of front protrusions and the rear protrusion in the top view, and wherein top portions of the pair of intermediate protrusions are respectively located between the pair of front protrusions and the rear protrusion, and are higher than top portions of the front protrusions and a top portion of the rear protrusion.