Method of heating and quenching a hollow metal member

摘要

A method of manufacturing a metal member includes the steps of forming a metal body (10) having a hollow core (14) , wherein a side (22) of the metal body (10) defines a core opening (18) exposing the hollow core (14); placing a filament (30) through the core opening (18) into the hollow core (14); closing the core opening (18) round the filament (30); and heating the metal body (10) so that the filament (30) disintegrates to form a filament hole sufficient to allow gas within the hollow core to escape through the filament hole.