FIELD: process engineering.
SUBSTANCE: invention relates to metal forming. Proposed mandrel consists of sections bolted together. Section butt plane is arranged on flange formed on one of said sections by tapered undercut. Said tapered undercut features cone height not exceeding 0.1 mm and apex directed toward mandrel work surface. Joint of said sections features press-fit. Amount of said press-fit allows maintaining at least 30% of press-fit in heating proposed mandrel in operating condition.
EFFECT: tight fit between sections, ruling out of metal flow-in there between.
2 dwg
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