Based on the universal design formula for blade curve of isopitch on gyre milling cutter,the continuous isopitch blade curve on spherical cutter with protruding arc is deduced.

• 给出了回转铣刀上等螺距刃口曲线设计的通用公式，进而应用通用公式推出凸弧的球头铣刀上连续的等螺距刃口曲线。