| Through numerical simulation and experiment, the typical defects in hydroforming of the stainless steel compensator joint by using normal die were analyzed. And then the die with angles and the separate die are used to solve the problem. A numerical simulation analysis has been conducted for hydroforming of the compensator joint by using the die with angles. With appropriate axial feeding, a sound part can be obtained by using the optimization die with angles. Through simulation and experiment, it is proved that the defects could be avoided by using the separate die, and the thickness variation of the formed part is analyzed.A numerical simulation analysis has been conducted for hydroforming of a stainless ball shell with different loading paths. Compared with the experiment, the hydroforming processs and the failure mode is analyzed. The distribution of thickness, movement of stress and stain paths of representative position are discussed.The influence of coefficient of average normal anisotropy on hydroforming is discussed. The position of strains on the top and bottom of wrinkle wave are given in FLD. The thickness variation of the formed part with different r are compared. With larger r , formed tube will be thinner. Tube anisotropy is strongly affecting on tube hydroforming. With larger or smaller coefficient of normal anisotropy, tube may burst in hydroforming process.
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