Patent ID: 9278395
Filing Date: 2016-03-08
CPC Classification: B23C,Y10T

Claim Text:
1. A milling insert, comprising: an insert body having a polygonal tabular shape, the insert body comprising: wherein, the rake faces include serrations having pluralities of mount portions and valley portions that are arrayed alternately to intersect the cutting edges, wherein, when the flanks are viewed along an axis transverse to a longitudinal axis of the insert body, the ridge line has a waveform shape in which bottom portions and top portions are formed into concave circular arc portions and convex circular arc portions, respectively, and are alternately repeated, wherein, both of the concave circular arc portions and the convex circular arc portions are a ¼ circular arc or more to a ⅓ circular arc or less, wherein, each concave circular arc portion that is located between two adjacent convex circular arc portions is positioned so as to be closer to one of the two adjacent convex circular arc portions and farther from the other of the two adjacent convex circular arc portions, and wherein the ridge line is formed with a pitch that narrows as the ridge line extends in a direction corresponding with an arc sequence of: farther-spaced convex circular arc portion, concave circular arc portion, closer-spaced convex circular arc portion, and the pitch gradually narrows over at least three iterances of the arc portion sequence.