Structure of the Cone-Frustums Shell during Hydro-Bulging

Structure of the cone-frustums shell and change of the parameters during hydro-bulging were introduced first. The reason for buckling of cone-frustums shell was analyzed theoretically. Effect of the cone-shells number, radius and thickness of the shell, strength of the welding seam was also given. This provided a theoretical guide for the hydro-bulging with cone-frustums shell.