Simulation optimization and experimental verification of saddle-shaped skin stretch forming process parameters
The wrinkling and cracking phenomena of a saddle-shaped skin part in the stretch forming process were studied to obtain the methods of eliminating the defects.By using the drawing method,the processability analysis of the skin part was carried out,and the range of process parameters was determined.The numerical simulation scheme was designed by using the orthogonal experiment method,and the simulation was performed by using the stretch forming module of AI-FORM software.The simulation results were evaluated and an optimal scheme was determined and verified by finite element simulation again.Finally,stretch forming experiments were carried out on the stretcher.It is found that the experimental results were in good agreement with the finite element simulation results,which eliminates the defects such as wrinkling and cracking,and improves the forming quality of the part.The results show that for skin part which is stretched to 4.9%when a larger elongation is used in the front part of the stretch forming trajectory,and is finally stretched to 7%when a smaller elongation is used in the rear part,which is beneficial to avoid wrinkling and cracking.Additionally,AI-FORM has a significant advantage over FormCAM in simulating wrinkling.
stretch formingnumerical controlled stretcherfinite element simulationsaddle-shaped skinorthogonal experiment
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