Patent ID: 8905685
Filing Date: 2014-12-09
Classification: B23C,Y10T

Abstract:
1. A roughing insert comprising: an insert body having a rake face and flank faces, and a mounting hole used to attach the insert body to an end mill body, the mounting hole being formed in the insert body so as to intersect with the rake face; a first waveform cutting edge formed on a first intersecting ridge portion between the rake face and the flank face of the insert body, said first waveform cutting edge having a first portion and a third portion; and a second waveform cutting edge formed on a second intersecting ridge portion between the rake face and the flank face of the insert body, said second waveform cutting edge having a second portion and a fourth portion, wherein the first waveform cutting edge undulates along the first intersecting ridge portion, and extends between a first corner portion connected with a first end of the first intersecting ridge portion and a third corner portion connected with a second end of the first intersecting ridge portion, the first portion extends from the first corner portion, the second waveform cutting edge undulates along the second intersecting ridge portion, and extends between a second corner portion connected with a first end of the second intersecting ridge portion and a fourth corner portion connected with a second end of the second intersecting ridge portion, the second and fourth portions extend from the second and fourth corner portions respectively, each of the first, second, third and fourth portions has multiple waveforms, the waveform cutting edges are formed such that the third portion and the fourth portion do not match each other and are mutually asymmetrical, while the first and second portions do match each other and are mutually symmetrical before and after the insert body is rotated by 60, 90 or 180 degrees around the mounting hole, and the third and fourth portions have the same length, wavelength and amplitudes as each other, and the second waveform cutting edge consists of the second portion, the fourth portion, and a flat connecting portion which connects the second portion and the fourth portion, such that the positions of the third and fourth position are offset from one another along their respective intersecting ridge portions by a length of the flat connecting portion.