Two new methods are presented for machining ruled surfaces.By means of adjusting the changing rate of straight generatrix, the first method can reform a general ruled surface into a developable one.

• 提出了2种加工直纹面的新方法．其中第1种方法通过调整直纹面上母线方向的变化规律，使之成为可展面，以便在加工中获得无脊棱的光滑曲面；