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Stereolithography, or SLA, is a rapid prototyping process used to create parts from 3D CAD data
in a matter of hours. SLA is a highly accurate additive manufacturing
process and may also be referred to as rapid prototyping or 3D printing.
Models created with this technology are typically used as concept models, for form and fit studies,
or as master patterns for molding techniques. The SLA process begins when CAD data is sliced
into thin cross-sections or layers, typically about six thousandths of an inch thick.
This data is then transferred to an SLA additive manufacturing system containing a vat of UV-curable
photopolymer. The machine begins to build the part one layer
at a time. Each layer is constructed from a ultraviolet
laser that is directed by X and Y scanning mirrors.
As the laser traces the cross-section on the surface of the resin, the liquid material
is hardened on contact. Once a layer is complete, the build platform
is indexed down to make room for the next layer.
A recoater blade moves across the surface ensuring a thin coat of fresh liquid resin
is evenly spread over the object. The laser continues to trace and form each
layer atop the previous layer, building from the bottom up.
The completed part is then carefully removed from the liquid and separated from the platform.
A chemical bath removes excess resin and the part is cured in an ultraviolet oven.
Any support structures are also removed at this time.
With numerous hand sanding and professional paint options available through service providers
such as Solid Concepts, Stereolithography has become an excellent economic choice for
rapid appearance models. A wide variety of industries have embraced
SLA including medical, automotive, entertainment, aerospace and consumer products.
http://www.solidconcepts.com