MANUFACTURE OF MOULDS
FOR ALUMINIUM DIE CASTING
This website has been developed in order to offer a brief introduction
to the world of development and manufacture
of moulds for aluminium die casting.
The transformation of metals into finished parts through the die casting
procedure is a very old practise which was already known by the Egyptians.
The most used materials are:
and its alloys;
- Copper and
its alloys (bronze, brass);
and its alloys;
Tin and its alloys.
The word “die casting” indicates the casting procedure
in which the filling of the mould occurs through the pressure which
a press executes
on the melted metal.
The form of the piece is gained through the mould therefore the manufacture
of moulds for aluminium die casting has to be carefully executed.
For a correct manufacture of moulds for aluminium die casting it is
essential to choose the right type of steel and the most suitable
heat-treating. There are basic elements that give the mould the technical-mechanical
features of a heat pump.
Casting is a manufacturing
process by which a molten material such as metal or plastic is introduced
into a mold, allowed to solidify within the mold, and then ejected or
broken out to make a fabricated part. Casting is used for making parts
of complex shape that would be difficult or uneconomical to make by
other methods (such as cutting from solid material).
Casting may be used to form hot, liquid
metals or meltable plastics (called thermoplastics), or various materials
that cold set after mixing of components such as certain plastic resins
(e.g. epoxy), water setting materials such as concrete or plaster,
and materials that become liquid or paste when moist such as clay,
which when dry enough to be rigid is removed from the mold, further
dried, and fired in a kiln.
Substitution is always a factor in deciding
whether other techniques should be used instead of casting. Alternatives
include parts that can be stamped out on a punch press or deep-drawn,
forged, items that can be manufactured by extrusion or by cold-bending,
and parts that can be made from highly active metals. (From http://en.wikipedia.org/)