FREMGANGSMAADE TIL PRESSEFORMNING AF METALGENSTANDE

摘要

A press-formed aluminium alloy object such as a piston 12 is formed with a cavity 14 with undercut with reinforced edges by placing an isostatically compressed salt core 10 and an annular aluminium silicate fibre mat 11 in the hollow forming chamber of a forming press before introducing the liquid metal. The core is thereupon dissolved from the press-formed object to impart a corresponding shape to the object, which does not require any subsequent chip-forming machining. <IMAGE>