摘要
给出了圆锥面截交线为椭圆时的投影方程，分析了截交线的投影形状，为准确作图提供了理论依据。并用解析法分析了圆锥面与圆柱面正交时相贯线的投影形状、特殊点位置及其作图方法。
This paper offers the theorectical basis for accurate drawing by introducing the projective equation，when the intersection line of the surface of taper cone is elliptical，and anylysing the projective shape of conic section. It also deals with the projective shape of the location of special points，its functioning fea- tures and some special cases of the linc of intersection by analitieal means when the circular and the cylindrical surface are orthogonal.
关键词
圆锥面
圆柱面
表面交线
射影响几何
surface of taper cone，surface of circular cylinder，conic section，line of intersection，special points
