On the base of theoretical analysis of the operationsof tube-preform flaring by the conical punch and necking by theconical die, equations for calculation of stresses and strains,changing preform thickness at its edges as well as for evaluation ofdeformation force and energy are obtained. The influence of theinitial normal anisotropy, friction, cone angle of the punch,materials strengthening on the parameters mentioned above isfound. The formulas for calculation of preform sizes and its edgethickness are presented.
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