Patent ID: 9630264
Date: 2017-04-25
CPC Classifications: B23C

Claim:
1. A cutting insert for a milling cutter, the cutting insert comprising: two polygonal main surfaces that oppose each other and a plurality of side faces that are formed continuously with the sides of the main surfaces, the main surfaces being rake faces, the side faces being flank faces, and ridge lines at positions where the main surfaces and the side faces cross each other being used as cutting edges, wherein: the plurality of side faces include two major side surfaces that oppose each other and a plurality of minor side surfaces that are formed continuously with the major side surfaces, a mounting hole is provided at the two major side surfaces in a direction in which the mounting hole extends therethrough, and areas of the two major side surfaces are greater than those of the main surfaces, the major side surfaces and the minor side surfaces are provided with flutes along entire regions of the cutting edges, each flute consisting of: (i) a flute face tilted in a direction in which depths gradually increase with increasing distance from the cutting edge, and (ii) a concave arc face connected with a top face of a main side surface and a lowest point of the arc face is lower than the top face of the main side surface.