FIELD: mechanical engineering. SUBSTANCE: hollow are marked in a cylindric blank from both its ends and spaces from both sides are preliminary formed. Outer cylindric surfaces are formed. Spaces are formed by final sewing simultaneously from both sides to form cross-piece. A polyhedral flange is formed. The cross-piece is then formed completely to provide a given ratio of the height of the cross-piece to its diameter. EFFECT: simplified method. 6 dwg
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