Production of a sheet metal ring or shell comprises drawing a raised part from a plate, perforating the raised part, forming a dome, forming a flange, bending the flange downward and setting up the edge of the flange

摘要

Production of a sheet metal ring or shell comprises drawing a raised part from a plate, perforating the raised part, forming a dome, forming a flange, bending the flange downward and setting up the edge of the flange. An independent claim is also included for a sheet metal ring produced by the above process. Preferred Features: The cylindrical wall of the perforations is sealed by a calibrating process and solidified. The transition region between the dome and the flange is formed into a linear cone segment or to a concave ball segment.