特殊用法canal helicoid1.管道螺旋面chased helicoid1.法向梯形齿廓螺旋面involute helicoid1.渐开线螺旋面milled helicoid1.铣削出的螺旋面oblique helicoid1.斜螺旋面pseudo-spherical helicoid1.伪[准]球形螺旋面right helicoid1.右螺旋面skew helicoid1.螺旋面2.斜面, 歪扭面