Patent ID: 7699565
Filing Date: 2010-04-20
Classification: B23C,Y10T

Abstract:
1. A radius endmill which has a substantially cylindrical shape and which is to be rotated about an axis thereof, and which has a plurality of teeth each including (a) a spiral-shaped peripheral cutting edge located in an outer peripheral portion of said endmill, (b) a bottom cutting edge located in an axial end portion of said endmill, and (c) a rounded corner cutting edge whose ridge line is defined by a circular arc having a given radius as measured in a side view of said endmill that is parallel to said axis, said rounded corner cutting edge being located in a corner portion of said endmill in which said outer peripheral portion and said axial end portion intersect each other such that said peripheral cutting edge and said bottom cutting edge are connected to each other through said rounded corner cutting edge, wherein said bottom cutting edge has a radially inner end lying at said axis, and a radially outer end at which said bottom cutting edge is connected to said rounded corner cutting edge, and wherein said bottom cutting edge is curved such that a ridge line of said bottom cutting edge is defined by a circular arc as seen in a plan view of said endmill that is perpendicular to said axis.