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摘要
To explore the internal high pressure forming laws of 5052 aluminum alloy T-shape tube, a finite element model of internal high pressure forming was established by Dynaform simulation software to study the influence of transition fillet radius of die, friction coefficient, the loading mode of internal pressure and axial feeding on forming. The results show that when the transition fillet radius of die is smaller(R=4 mm), it is not conducive to the attachment forming of branch tube, and the fillet radius of 10 mm is more conducive to the material flow and attachment forming of branch tube. Reducing the friction coefficient during forming can not only make the wall thickness distribution of the T-shape tube more uniform, but also improve the height of branch tube. The upward convex internal pressure loading curve and the delaying downward concave axial feeding loading curve can increase the loading speed of internal pressure, avoiding the wrinkling phenomenon of branch tube caused by too much feed tube material due to insufficient pressure in tube. Finally, the tube with the size of Φ60 mm×1.5 mm was used to carry out the experiment. The experimental results are basically consistent with the simulation results, which verifies the accuracy and reliability of simulation.
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