Aimed at a kind of rotary cutting machine, the machining process of trihedron cutting is kinematically analyzed, and the moving locus equations of cutting edge are deduced.

• 对回转车削三面体的过程进行了运动学分析,建立了刀尖相对于工件的运动方程,计算了用该方法加工三面体零件时的各个参数。