FIELD: plastic metal working for upgrading process properties of workpiece; aircraft industry, shipbuilding and other fields of mechanical engineering. SUBSTANCE: tubular workpiece to be elongated is subject to non-monotonous deformation within loading cycle tension - torsion - tension - ... In so doing torsion of workpiece after each stage of its tension in axial direction ensures non-monotony of deformation. EFFECT: Usage of this method in mechanical engineering allows to produce high-quality articles. 4 dwg
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