CAD 绘制复杂装配图的难点在于零件图拼装完成后对零件轮廓线的修改，基于洋葱切开后的断面图形提出用分层拼装法绘制复杂装配图。以推杆阀装配图为例，介绍该方法绘制装配图的绘图思路及步骤。%The difficulty of drawing complex assembly by CAD lies in the parts of modifying the parts contour line after assembling part drawing.Based on section graphics of cutting the onion,layered assembly method was pro-posed for drawing complex assembly.The method is very practical for the advantages of simple theory,easy trim-ming,high speed and accuracy.Push -rod valve assembly drawing is used as an example to introduce the idea and steps in detail.
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