Abstract
nternal high pressure forming is a new technology producing hollow light components. Due to the process of internal high pressure forming is very complicated with many factors, the dissertation will focus on the use of plastic-elastic force theory to acquire the hydraulic pressure needed and the tubes wall thickness in the final forming fillet. Based on the assumption of volume's incompressibility condition, we analyze and calculate the stress and strain of the tubes wall. Finally we estimate the formula of the hydraulic pressure needed in the forming process. The whole work can offer a concise formula to engineer in the infancy of designing. And it also is the great theoretical support to the development of the internal high pressure forming.
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