FIELD: metal working. SUBSTANCE: manufacture of wall and trough of blade blank provides employment of approximation method. In this case back of blade is made in the form of at least two cylindrical or conical surfaces whose mating lines is common generant of these surfaces within the range of tolerance zone relative to thickness of blank. Trough of blank has radius of circumference described at the butt end cross section of blank. EFFECT: enhanced accuracy of metal working. 4 cl, 10 dwg
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