由椭圆近似画法引出的近似切线曲面

探讨一种特殊变形接头的近似展开法。当上下两口一个是圆，一个是椭圆，或上下两口都是椭圆时，两口间的曲面一般是切线曲面，作切线曲面的展开图比较麻烦。用近似法画出的椭圆是由几段圆弧连接而成。当上下两口都由圆弧组成，而且两口所在的平面相互平行时，两口间的曲面本文称之为近似切线曲面。研究结果表明，这里所指近似切线曲面，是由简单的可展曲面如锥面、柱面等组合而成，因而它的展开图法也变得比较简单。

DEVELOPMENT OF AN APPROXIMATE TANGENT SURFACE USING THE TECHNIQUE OF CONSTRUCTION OF AN APPROXIMATE ELLIPSE

This paper presents an approximate development from a round to ellipse or ellipse to ellipse transition piece. The curved surface in these transition pieces is a tangent surface that can not be developed simply. An approximate ellipse is made of arcs. In a transition piece, if the top is parallel to the base and each end curve is made of arcs, the curved surface, called an approximate tangent surface in this paper, is developed easily, because it is made of single curved surface such as a cylinder, or a cone.