Abstract
The principle, the technical procedure and features of the dieless hydroforming technology of double layer spherical vessels are introduced. The structures and materials of the shells before bulging are discussed, as well as the technical problems associated with bulging of the shells, taking account of experiments on a few double layer spherical shells. The deformation process, the thickness distribution and the diameter variation are also analysed, together with the deformation process of the shell at the initial deformation stage which is analysed by using elastoplastic finite-element method. Finally the industrial prospect is pointed out.
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