Patent ID: 8727675
Filing Date: 2014-05-20
Classification: B23C,Y10T

Abstract:
1. A double-sided cutting insert comprising: an upper surface and a lower surface each having a rectangular shape and formed at upper and lower sides of the double-sided cutting insert; side surfaces formed at four sides of each of the upper surface and the lower surface; an assembling hole formed in a direction perpendicular to the upper surface; major cutting edges formed at corners of one of the side surfaces respectively so as to be rotationally symmetrical with respect to a center of an outer shape of the double-sided cutting insert in a plan view where the upper surface is the front and to be rotationally symmetrical with respect to the center in a view of one of the side surfaces, which is a side view of the double-sided cutting insert; minor cutting edges formed at one side of each of the major cutting edges so as to be rotationally symmetrical with respect to the center in a plan view where the upper surface is the front and to be rotationally symmetrical with respect to the center in a view of one of the side surfaces, which is a side view of the double-sided cutting insert; and minor side surfaces formed on a surface where the minor cutting edges meet the side surfaces and inclined toward the center with respect to a central axis of the assembling hole.