FIELD: metallurgy.
SUBSTANCE: invention refers to metal processing by pressure, particularly to manufacturing of axisymmetric wheel tread base by cold transformation. Side wall of mainly cylindrical metal base with mainly constant wall thickness is expanded radially outwards by cobbing. Expanded side wall thickness is altered along longitudinal axis by rotation extrusion with pulling in axial direction and by side wall shaping. Device includes cobbing plant for radial outward expansion of side wall in cylindrical base, and rotation extrusion plant for expanded base shaping and pulling in axial direction.
EFFECT: reduced labour intensity, improved quality.
13 cl, 6 dwg
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