Abstract: 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.

Abstract: The invention relates to a method for the manufacture of a vehicle wheel with a wheel body and a rim having at least one undercut. In order to provide a simple, inexpensive method for the manufacture of a weight-reduced vehicle wheel, according to the invention the construction of an undercut in the rim area is integrated into the manufacture thereof by a spinning process. A cast preform having a clearly defined construction, is fixed in a spinning machine where initial preshaping takes place, a rim bed with an inside rim horn is formed and then by splitting and forming a rectangular flange cast radially onto the wheel body, the undercut and an outside rim horn are constructed. Following a heat treatment, machining is carried out for the final rim construction.