Improvement of pre-forming process of tube hydroforming based on DYNAFORM

The hydroforming process of components with complex hollow shape has been simulated numerically.By use of a finite element simulation,the wrinkling,cracking and other defects on the hollow bent parts with rectangular cross section during hydroforming process have been analyzed.The above defects have been solved byuse of pre-filled method with elliptical cross section shape.It is verified via experiments that the lower pressure can improve the distribution of materials,forming limit of materials during the hydroforming process,which controls the defects and improves product quality.