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By
the process of Investment Casting
Aluminum prototypes can be manufactured.
There are 2 methods of making these
prototypes.
The
first step is to make one Rapid Prototype
of the component using the most appropriate
RP method.
Using this piece as a master, a silicone
rubbermould is made which is then
used to cast wax. This step gives
components in wax material.
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On
this wax pattern, the feed system and the
air venting system is attached and ceramic
slurry is coated all around the pattern.
This slurry coating is a few mm thick and
this depends on the component geometry.
After the coating step is completed, the
wax is melted out in a process known as
dewaxing. This leaves a hollow ceramic shell
in which molten aluminum can be pored.
Finally
molten aluminum is poured in and after cooling,
the shell is broken to get the final
aluminum casting.
These castings can now be post finished,
plated and secondary operations such as
hole drilling can be performed.
The above is a very accurate method of getting
a small quantity of metal components without
making a die for pressure die casting.
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