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- Information about technological processes
and working systems . Everybody can contribute with documentation,
that must be sended to info@rioweb.it
accompanied with the name of the source, and if possible the link
of the site one where there is the possibility of a deepening.
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Extrusion process
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- The aluminum extrusion process really begins
with the design process, for it is the design of the product--based
on its intended use--that determines many of the ultimate production
parameters. Questions regarding machinability, finishing, and
environment of use will lead to the choice of alloy to be extruded.
The function of the profile will determine the design of its form
and, hence, the design of the die that shapes it.
- Once the design questions have been answered,
the actual extrusion process begins with billet, the aluminum
material from which profiles are extruded. The billet must be
softened by heat prior to extrusion. The heated billet is placed
into the extrusion press, a powerful hydraulic device wherein
a ram pushes a dummy block that forces the softened metal through
a precision opening, known as a die, to produce the desired shape.
- That is a simplified description of the
process known as direct extrusion, which is the most common method
in use today. Indirect extrusion is a similar process, but with
some important differences. In the direct extrusion process, the
die is stationary and the ram forces the alloy through the opening
in the die. In the indirect process, the die is contained within
the hollow ram, which moves into the stationary billet from one
end, forcing the metal to flow into the ram, acquiring the shape
of the die as it does so.
- The extrusion process has been likened to
squeezing toothpaste out of a tube. When pressure is applied at
the closed end, the paste is forced to flow through the open end,
accepting the round shape of the opening as it emerges. If the
opening is flattened, the paste will emerge as a flat ribbon.
Complex shapes can be produced by complex openings. Bakers, for
example, use a collection of shaped nozzles to decorate cakes
with fancy bands of icing. They’re producing extruded shapes.
More information to the official site: http://www.aec.org/cyberg/process.html
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