Patent ID: 6719501
Filing Date: 2004-04-13
Classification: B23C,C23C,Y10T

Abstract:
A cemented carbide end mill comprising:three or more cutting edges formed on a periphery thereof, each of cutting edges having a base material of ultra-fine particle cemented carbide alloy containing 10%-14% cobalt and being coated with a titanium-aluminum nitride hard film; a plurality of flutes each provided between adjacent cutting edges, each of flutes having a helix angle of 35Â°-60Â° and, as viewed in a cross section perpendicular to an axis of the end mill, being in a shape generally concave radially inwardly, wherein each of said cutting edges has a first flank following the cutting edge and a second flank connecting the first flank and a heel, and said second flank is in a shape generally concave radially inwardly, and said cutting edges and said flutes being formed such that a land width which is the width from the cutting edge to the heel, and a flute width, which is the distance between the neighboring cutting edge and the heel, as viewed in the cross section perpendicular to the axis of the end mill, are in a ratio of 1:1.5 to 1:4, and the end mill has a core diameter that is 62%-68% of an outer diameter thereof.