在引入辅助图形的基础上，运用解析法计算异型钢管的孔型，并借助计算机进行辅助设计，可提高运算速度和精度。
Based on the related sketches, pass design for the welded shaped steel tube can be obtained with analytics. Aided with computer, computing speed and accuracy can be enhanced.
同时引入了过变形概念，这对其它异型管孔型设计也很有借鉴作用。
Meanwhile over transform conception is introduced and this is also use for reference to other rectangular pipe pass design.
介绍了该法的设计原理和特点，并附有异型管孔型设计图。
This article introduced the design principle and characteristic, also appended irregular pipe roller design diagram.
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