关于具有公共对称平面的二次回转曲面交线的投影分析

Analyzing projection about Intersecting Line of Second Camber Having Common Symmetrical Surface

应用图解和数解结合的办法,找出两个二次曲面相贯的规律,当两个具有公共对称面的二次回转曲面的轴线平行时,相贯线在公共对称面上的投影一般为抛物线;当两个具有公共对称面的轴线相交时,相贯线在公共对称平面上的投影一般为双曲线。

The rule about two coherent second cambers can be found by the method of diagrammatizing and figuring. When the axes about two second helicoids which have common symmetrical surface parallel, the projection of its coherent line on the common symmetrical surface usually is parabola, but It is hyperbola commonly when the axes intersect.