Method and apparatus for the manufacture of a workpiece having a boss

摘要

A method and an apparatus for the manufacture of a workpiece having a boss from a rotationally symmetrical sheet metal blank with a central opening on a spinning or flow-forming machine. In an area around the central opening the sheet metal blank is shaped to a sleeve-like boss. The sheet metal blank central opening initially has a diameter smaller than the internal diameter of the boss. The central opening is subsequently widened to the internal diameter of the boss, the displaced sheet metal blank material being used for forming the sleeve-like boss. At least one flow-forming process is performed in this clamping operation.