Research on Precision Control of Axial Low Pressure Forming for Aerospace Tunnel Tube
In response to the high-density launch demand of launch vehicles,the overall manufacturing quality,reliability and production efficiency of tunnel tubes for storage tanks are further improved.For the tunnel tube with a diameter of 340 mm made of 5A03 aluminum alloy for aerospace is taken as the research object.Through conducting finite element simulation analysis of axial low pressure forming corrugation,the influence of different process parameters such as internal pressure and replenishment amount on the accuracy of the corrugated surface and wall thickness distribution of the tunnel tube is explored.The results show that when the internal pressure of corrugated forming is 4 MPa and the amount of material added is 16.5 mm,the waveform accuracy and wave height meet the design requirements.The consistency of the circumferential and axial corrugated wall thickness distribution is good,and the maximum thinning rate is 7.09％.
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