FIELD: metal forming.
SUBSTANCE: invention relates to metal forming and can be used for production of elliptical, parabolic, toroid-spherical and spherical structures from aluminium alloy sheet to be used in various industries, primarily, for bottoms of railway cisterns. Sheet blank from alloy of Al-Mn-Mg system is processed. Treatment includes at least a once-repeated first treatment step, a repeatedly-repeated second treatment step and an at least one-time third treatment step. During the first processing stage, annealing and further stamping are performed. Second stage includes annealing with further flanging. Third stage includes annealing and further calibration.
EFFECT: providing high corrosion resistance in aggressive media and strength of items and reducing their weight.
14 cl, 3 dwg, 2 tbl, 3 ex
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