Center avoidance type drilling and milling cutter

The utility model discloses a center avoiding type drilling and milling cutter which comprises a cutter handle body with a connecting end and a working end, an annular boss extending in the axial direction is arranged at the working end of the cutter handle body, an avoiding center hole is formed in the center of the annular boss, and a cutting part extending outwards in the axial direction of the cutter handle body is arranged on the end face of the annular boss. The outer end of the cutting part is provided with a main cutting edge extending in the wall thickness direction of the annular boss. The utility model has the beneficial effects that for a part with a central convex column, the counter bore in the circumferential outer edge of the part can be quickly expanded. 本实用新型公开了一种中心避让型钻铣刀，包括具有连接端和工作端的刀柄主体，所述刀柄主体的工作端设有沿轴向延伸的环形凸台，环形凸台的中心形成避让中心孔，环形凸台的端面设有沿刀柄主体的轴向向外延伸的切削部，切削部的外端具有沿环形凸台壁厚方向延伸的主切削刃。本实用新型的有益效果是：对于具有中心凸柱的零件，可快速实现扩大其周向外沿的沉孔。