| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 95 === In contrast to traditional stamp shaping techniques, tube hydroforming is a realively new shaping technique. But there are still a lack of engineering parameters, mold designs data bases and technique knowledge in this area.
This research conducts various tube hydraulic bulge forming experiments, using hydraulic bulge forming testing machines. The pressure and bulge height for UNS C26800 zinc-copper tubing and AISI 1215 carbon steel tubing are measured. The above data are substituted into a hydraulic pressure bulge mathematic model to derive UNS C26800 zinc-copper and AISI 1215 carbon-steel tubes flow stress parameters of initial yielding stress σ0、coefficient K value and contingency index n value. Moreover, tensile test of the above materials are conducted to the material’s σ0、K and n values. then proceed with a comparison of the two sets of statistics.
In bulge tests, UNS C26800 zinc-copper tube annealed with temperatures of 300℃ and 500℃ and the not-yet annealing AISI 1215 carbon-steel tube without annealing are used. Additionally, finite element package software is used to simulate the bulge-height and forming pressure.
From the comparisons of experimental and analytic results, the deformation mechanisms of tube during the bulge-shaping discussed.
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