I - Aluminium Articles
Commercial-purity or refined aluminium is mostly used because the various impact extrusion processes are used mainly for the manufacture of tubes, spray and beverage cans and containers for the cosmetics industry.
Basically all non-heat treatable and age-hardenable wrought alloys can be used to make engineered parts, the production of which is
With direct impact extrusion of solid parts, the blank in the form of a solid piece is first upset in the cavity directly next to the die in order to completely fill the cavity. Immediately afterwards the extrusion punch forces the metal through the die, which shapes it. After forming, an ejector punch pushes the shaped part back out of the die.
The properties of aluminium depend on a whole range of factors. The other elements that are present in commonly used alloys, either as deliberate additions or as impurities, play a particularly important role.
With the exception of refined aluminium (Al99,99), the aluminium used on a commercial scale is always in the form of an aluminium alloy
Toolmaking is basically similar for all of the various impact extrusion processes. The tooling system consists mainly of a standardised basic frame with the working parts attached to it; the actual arrangement is determined by the workpiece being produced.
For economic reasons, impact extrusion is used mainly for medium and large-scale production