微小ニック付きエンドミルの開発とその切削性能

抄録

The magnitude of the ploughing force on a cutter edge can be reduced by decreasing the contact area between work surface and edge. In this paper, a fine nick is performed to the cutter edge on a four-fluted end mill in view of the decreasing surface profile error produced by the tool deflection. The performance of the end mill with the fine nick is verified through the measurement of ploughing force and chip geometry in the face milling. It is shown that the magnitude of force drop exceeds the expected value that was calculated from the geometrical change of the contact area since the plastic sliding region decreased near the wedge that was created by the nick. The cutter has the capacity to reduce the surface profile error as well as to maintain the surface roughness by improving the wear resistance, while a deterioration of surface roughness produced by the groove wear is unavoidable under normal conditions.