FIELD: plastic metal working, possibly manufacture of parts from tubular blanks. SUBSTANCE: apparatus includes steel inductor, interturn insulation, insulation sleeves and electrically conducting rod. Turns of inductor have constant width; height of turn is variable value. In description of invention relation is given for determining dependence of turn height from its order number; said dependence allows to make desired part due to variable height of adjacent turns. EFFECT: possibility for providing predetermined deformation of envelope without shaping equipment at lowered power consumption. 2 cl, 1 dwg
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