METHOD FOR GAS SHAPING OF ENVELOPE AT ISOTHERMIC CONDITION AND AT SUPERPLASTIC YIELD OF MATERIAL Russian patent published in 2004 - IPC

FIELD: machine engineering, possibly manufacture of different three-dimensional articles of metal alloys. SUBSTANCE: method comprises steps of placing blank in die set; heating blank in furnace; supplying gas into die set at initial pressure Po; determining deformation time interval according to given formula; measuring geometry parameters of current condition of deformed blank during said time interval; detecting hydrostatic pressure and components of deformation speed tensor at end of each time interval; determining maximum value of rate of deformation speed in the whole volume of deformed blank; setting rate of blank deformation speed; realizing gas supply into die set while sustaining gas pressure value (during current time interval) according to value calculated with use of given mathematical expression. EFFECT: possibility for making complex-shape envelopes, enhanced operational and technical characteristics of envelopes. 10 cl, 10 dwg, 1 ex _