Transactions of Materials and Heat Treatment

Title：Spinning with multi-constraint for large-diameter to thickness ratio and thin-walled spherical head

Authors： Chang Shiwu Li Xinhe Zhou Lei Wei Zhun Zhang Tan

Unit： Central South University Capital Aerospace Machinery Company

KeyWords： large diameter to thickness ratio and thin-walled spherical head spinning with multi-constraint multi-pass wall thickness uniformity wrinkling

ClassificationCode：TG306

year,vol(issue):pagenumber：2017,42(2):45-51

Abstract：

Large thin-walled spherical head is of large-diameter to thickness ratio and weak rigidity, therefore, it is easy to appear wrinkling by traditional spinning. The scheme of multi-constraint spinning was put forward based on the energy method and the metal plastic theory as well as the forming defects of central constraint spinning. The analysis shows that the synergistic effect of multi-constraint and multi-pass can increase the energy constraint in the forming process of workpiece, and effectively restrain the wrinkling in the outer flange. So the forming part is of large-diameter to thickness ratio and good surface smoothness. The model is reconstructed by reverse engineering software PolyWorks to obtain wall thickness data of the actual sample along the generatrix direction with the distribution of lack thinning at both ends and over thinning at the center. However, due to the strong constraints, the terminal is thickened significantly. The deviation ratio of positive and negative wall thicknesses is less than 15%, so the uniformity of wall thickness is well.

Funds：

国家重点基础研究发展计划（973）项目(2014CB 046600)

常士武(1990-)，男，硕士研究生李新和(1957-)，男，博士，教授

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