Process and apparatus for realising perforations through double walls of structural members by the internal pressure forming method and a herewith manufactured transversal oscillating lever

摘要

The manufacturing process is for tubular components. It involves hydroforming a metallic tubular section in a forming tool. A dome-shaped branch (6) is formed on the tubular section (105) and the dome top (9) is then pressed inward by a first counter-punch (8). The counter-punch supports the dome during forming, until the dome top (9) lies against the opposite wall (19) supported by a second counter-punch (15). The double layer (20) thus formed is thereafter removed by a parting tool. Process tooling and an automotive transverse control ram may also be manufactured by this process.