Fabrication of aluminium alloy wheel discs for heavy lorries - entails three stage stamping followed by formative machining

摘要

The fabrication of aluminium alloy wheel discs for heavy lorries with tubeless pneumatic tyres has two stages forming the disc (7) from a rough cylindrical ingot, and a machining and finishing stage. The primary stage involves stamping and formative pressing operations. A crudely formed peripheral flange is produced parallel to the wheel axis. The second stamping extends the flange and roughly forms the rim. A final stamping extends both rim (12) and flange (11) to their required length. A formative pressing obtains the flange in its machinable form. The flange (11) is initially conical and progressively extended and reduced in thickness.