工程制图中两投影的多解问题

讨论了工程制图中两投影的多解问题 ,提出了确定不定形投影的两条规律 :( 1 )两投影为对应类似形时具有多解性 ;( 2 )两投影在空间对应同一点集时具有多解性 .同时指出两面投影中一些几何元素是可以定形的 :如点、一般位置直线、两面体系中投影面的垂直面 .某一投影具有特征视图、而两投影不具有对应类似形的立体投影 .它们的两面投影可唯一确定空间形状 ,从而为读图、制图及机件表达提供了理论依据 .

Problems of the mutiple solution of two*.plane projection of engineering drawing

This paper discusses the mutiple solution of two*.plane projection of engineering drawing.It puts forward two pieces of principle that decide mutiple solution of two*.plane projection;(1)Two*.plane projections with corresponding anologue;(2)Two*.plane projections with some point collections of space,and it gives the necessary condition that determine space geometric figure:for points,the slant line of projection plane,the vertical line of projection plane,the vertical plane of two*.projection*.plane system,their two*.plane projection only determine their space figure.It provides a theoretical basis for interpretation of drawing,draftiny and expression of works.