Patent ID: 8876441
Filing Date: 2014-11-04
Classification: B23B,B23C,Y10T

Abstract:
1. A cutting insert formed of a plate-like member with a substantially polygonal outer shape and comprising: a rake face with a chip breaker which is formed on at least one of top and bottom surfaces; a flank formed on an outer peripheral surface extending between the top and bottom surfaces; and a cutting edge formed on an intersection portion between the rake face and flank, the cutting edge comprising: a chip-breaker concave portion is formed in the vicinity of the arc-shaped cutting edge on the rake face; a breaker projection stands from a bottom surface portion of the chip-breaker concave portion; and the chip-breaker concave portion is defined by an inclined surface which is curved in a concave manner and which is smoothly connected to the bottom surface portion while being gradually inclined toward the bottom surface portion, from a peripheral nose edge portion on the nose portion side to the bottom surface portion.