Method for forming a workpiece by flow-forming

Method of flow-forming a workpiece having completely formed internal teeth, said method comprising the steps of:

• axially fixing a cup-shaped blank against a tool chuck;
• pressing said blank onto said tool chuck using a plurality of rolling bodies;
• rotating said blank relative to said plurality of rolling bodies;
• pressing said plurality of rolling bodies, which are located in a ring-like arrangement around a rotational axis of said blank, at a start of the flow-forming and at an open end of said blank, which is against a cylindrical wall area of said blank, to form said internal teeth, without elongating an axial length of said teeth so that material flow, in an axial direction away from a base of said blank, is prevented, and better filling of a profile of said tool chuck is achieved;
• flow-forming said blank through contact with said plurality of rolling bodies, wherein the flow-forming comprises contacting said blank with conical rolling members which roll in an inclined manner in a conical ball race with respect to said rotational axis of said blank;
• and
• guiding said plurality of rolling bodies in an axial relative movement over said cylindrical wall area of said blank to said base of said blank, said base of said blank being in forming contact.