FIELD: metallurgy.
SUBSTANCE: hollow workpiece is obtained and further treatment of its inner surface is performed with repeated back-and-forth axial movement of puncheon with simultaneous rolling and crimping of external surface in roller-type matrix. Edges of workpiece are fixed with applied axial force and created axial stress which is close to and does not reach the workpiece material yield point.
EFFECT: increasing efficiency of obtaining metal bushings with gradient submicro- and nanocrystalline structure.
1 dwg, 1 ex
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