Research On Superplastic Bulging Experiment Of Cone-shaped Part

Superplastic equipment, convenient die construction and high forming precision are the features of superplastic forming of bugling. The production of high strain rate material reduces process time so that it gains popular implication in the industry of aeronautics and astronautics. Some parts such as aircraft rectifying cover, launching cover and focusing cover need the realization of cone shaped or similar-to-corn shaped drawing-bugling forming.However superplastic forming of bugling has the disadvantage of uneven thickness distribution. Through pressure bulging simulation of square corn-shaped part by MARC, finite element simulation software, this thesis attaches great importance to research the influences on the thickness distribution in sheet materials by different loading methods during the pressure bulging of TC4 titanium alloy, acquires relative optimized P-T curve. The simulated results by MARC are further verified by bugling experiment.According to the disadvantage of cavity in superplastic forming of bugling, this thesis also experiments pressure bulging simulation of corn-shaped part by MARC, tries to compare the influences of back pressure bugling on Al5083 under variable conditions, such as inner cavity, thickness distribution and forming limitation. The results of experiments indicates that the employment of suitable back pressure bugling can effectively restrain cavity, improve the forming limitation, and better the forming capability. Last, this thesis provides the curve of variable cavity volume fraction with the change of equal effect at the limitation point in normal bugling and back pressure bugling.