Abstract: A method for processing a preform for a rim wherein a ring-shaped rudimentary metal rim edge (5) is clamped in a slit (13) moving along the circumferential edge of the rim edge (5) between a profiled outer surface (8) of a mandrel (7) and a profiled outer surface (11) of a profiling roller (9), wherein the slit (13) is wedge-shaped and wherein an angle (a) included by the centerlines (6, 10) of mandrel (7) and profiling roller (9) is reduced, propelling material of the rudimentarily formed rim edge (5) to a wider portion of the slit (13). The invention also relates to an apparatus for processing a preform for a rim, and a rim.

Abstract: A method for manufacturing a substantially rotationally symmetric rim bed having a wall thickness varying along the longitudinal axis by means of cold forming, wherein the side walls of a substantially cylindrical metal bed having a substantially constant wall thickness are flared radially outwards in a pressing operation, and wherein the wall thickness of the flared side walls is varied along the longitudinal axis by means of flow-spinning, with axial stretching and profiling of the sides. The invention further relates to an apparatus for manufacturing a rim bed by means of cold forming.