Patent ID: 8647025
Filing Date: 2014-02-11
Classification: B23C,Y10T

Abstract:
1. A monolithic end mill having a longitudinal axis, the end mill comprising: a shank portion extending along the longitudinal axis; and at least one cutting portion extending from the shank portion and including a cutting tip having a web, the cutting portion having a cutting diameter, an axial length of cut that is no more than twice the cutting diameter, a core diameter that is at least 0.7 times the cutting diameter, and a plurality of blades disposed at a helical angle from the longitudinal axis along the axial length of cut and extending at a radial angle onto the cutting tip to form a negative endrake across an axial cutting edge and terminating proximate to the web; wherein each of the blades of the plurality of blades is separated from one another by a flute and has a corner radius, a negative radial rake, and a negative axial rake; and wherein the cutting tip has a dish angle and a plurality of gashes, each of the gashes of the plurality of gashes having a gash angle and extending into one of the flutes and wherein the end mill is constructed from a ceramic.