FIELD: plastic metal working, namely processes for rolling out annular blanks. SUBSTANCE: at any stage of rolling out process current value of inner diameter (Di) including its final value is determined according to reduction value ((Δti)) used in relation Di=f((Δti)) while taking into account initial size of blank. It allows to continuously measure diameter of rolled out blanks. EFFECT: enhanced accuracy at rolling out annular blanks. 5 cl, 13 dwg
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