FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and may be used for drawing thin-wall complex-shape parts from tubular billet. Billet is mounted on mandrel with cylinder and profile sections. Billet is clamped on mandrel cylinder section and processed by rolls in one or several passes. Each continuous pass forms, first, billet larger-diametre cylindrical section, then shaped section and, finally, smaller-diametre cylindrical section. During first pass, constant-thickness wall billet is produced. Thereafter, in subsequent passes, variable-thickness wall billet is produced with rolls fed onto and removed from the billet as-displaced. Between passes, billet is thermally treated.
EFFECT: higher accuracy of geometric parametres and surface quality, as well as higher efficiency.
7 cl, 4 dwg, 2 ex
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