本文分析了回转壳体正负成形的力学模型，基于应力屈服条件对回转壳体的变形进行了分类；
In this paper, the mechanical model of positive-negative formation for revolving shell is analyzed, the classification method is given according to the stress yield criterion.
文章提出了形状特征的分类原则，并以回转体类零件为例，介绍了零件信息描述的过程。
In this paper, we designed the classification rules of surface feature, then illustrated the process of part information describing for an example of rotating parts.
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