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对于易起内皱的迥转体零件，要使用环形拉伸筋．本文根据此类零件的变形特点，在试验研究基础上，对拉伸筋的阻力构成、筋的结构及位置等进行了机理分析，并结合应用提出了思考问题的途径．
For swivel parts that are easy to wrinkle, use a ring-shaped stretch bar. Based on the experimental study, this paper analyzes the structure of the resistance, the structure and the position of the tendons, and puts forward the ways to think about the problems according to the deformation characteristics of such parts.