| 摘要 |
Even if chips enter a gap between a flank face and a surface to be worked, the defect of the flank face or a cutting edge is suppressed by the control of the flow of the chips. A plurality of cutting edges 6, which are undulated in wave forms in a direction of an axis, are formed on an outer periphery of a front end portion of an end mill body 1 rotating about the axis so that phases of the wave forms are displaced from each other in a path of rotation about the axis; flank faces 5 of the cutting edges 6 are covered with a coating film; rough surface regions B and smooth surface regions A are alternately formed on the surface of at least portions of the coating film, which are close to the cutting edges 6, in the direction of the axis; and the number of fine particles or fine protrusions, which have a size in the range of 0.3 µm to 5.0 µm and protrude from the rough surface region B, is larger than that of the smooth surface region A. |
