Thin-walled hollow wheels with internal and external toothing, and apparatus and method for manufacturing the same

A method for manufacturing a hollow wheel which comprises an internal toothing and an external toothing, wherein the internal toothing is a gear toothing, the method comprising:

• providing a workpiece to be machined with at least one stamping tool, wherein the workpiece comprises a tubular section with a longitudinal axis as well as at least one first stabilization section which is connected to the tubular section for shape stabilization of the tubular section during the machining with the at least one stamping tool,
• providing a die for receiving the tubular section, the die comprising a tubular opening in which an internal die toothing is provided,
• inserting the tubular section into the tubular opening, and
• machining the workpiece on the inner side of the tubular section inserted into the tubular opening with the at least one stamping tool to simultaneously produce the internal toothing and external toothing, wherein during the machining, the workpiece executes a rotation movement with a temporally varying rotation speed about said longitudinal axis and the at least one stamping tool executes radially oscillating movements which are synchronized with said rotation movement so that the at least one stamping tool forms the tubular section into the die toothing to produce the external toothing and to simultaneously produce the internal toothing with repeated hammering machining of the tubular section, wherein the radially oscillating movements are aligned perpendicular to the longitudinal axis.