This paper presents the relative equation of location and orientation of toroidal cutter in NC machining of hyperbolic or elliptic area of freeform surfaces which is concave along the direction of path interval.
给出了带角圆铣刀在曲面凹向行距的双曲域或椭圆域ＮＣ加工中铣刀工作姿态相关公式和行距定量计算模型，纠正了有关文献的疏漏，并用简例进行了验证，为带角圆铣刀正确选用提供了依据。
