FIELD: process engineering.
SUBSTANCE: invention relates to production of composite mandrels of Pilger mills. Solid mandrel cores are made from mandrel rejects by their regrinding to produce lock part, working part and guide part. Working part consists of cylindrical and conical parts while guide part is composed of cylindrical part and end cone. Forged billets of EST ingots or billets produced from sound parts of 400-500 mm diameter mandrel rejects from "25Х2М1Ф" steel are heated to ductility temperature and pierced at helical rolling mill to sleeves. Said sleeve is fitted on said prefabricated structure till contact with lock cone to roll-and-knurl the sleeve on cores at Pilger mills. Thermal treatment of composite mandrel billets is carried out to produce 40-50 mm deep sorbite jacket on the surface. Then, said billets are machine to produce composite mandrels.
EFFECT: decreased consumption of heat-and-wear-resistant steel.
2 cl, 1 dwg, 1 tbl
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