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Jun 19, 2007 13:47:49 (GMT -05:00) Eastern Time (US & Canada) Jun 20, 2007 00:00:00 (GMT -05:00) Eastern Time (US & Canada) No (click here to learn more about
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Script Details
One of the main processes for high-end prototyping is called SLA, Stereo Lithography Apparatus. An SLA system creates plastic parts by curing ultraviolet sensitive resin with a UV laser. The SLA system consists of a UV laser, a vat of photo-curable liquid resin, and a computer system that controls the entire machine. All that you need to get started is a 3d model of your desired prototype, either from a CAD software package or a 3d animation software package, this is all that is necessary to provide build information to the SLA system. Special software then cuts the 3d, or CAD file into thousands of layers per inch, called slices, and outputs the slice data to the SLA system.
First a platform is lowered into the vat of resin, and is leveled off at the very top of the vat. The UV laser then draws the first layer shape into the resin, solidifying the first slice onto the platform. After the first slice is cured by the laser the platform then lowers into the resin anywhere from 1 to 7 thousandths of an inch, depending on the desired resolution. The recoater arm then sweeps across the top of the previous slice layering a film of resin that is then cured by the UV laser again. This process repeats as the platform lowers into the vat, and the part is built layer by layer. Within a few hours the part is complete, containing most or all of the detail from the original 3d file.
Prototyping; creating a sample part or object before production and manufacturing insures desired form and function of the final part or design. Modern prototyping can reflect the final design thereby improving design time by up to 50%. Companies can easily and quickly find out how the part interacts with the environment which it was designed for. They can hold it and feel it to insure the geometry and design is what they wanted.
One of the main processes for high-end prototyping is called SLS, Selective Laser Sintering. An SLS system creates plastic parts by curing heat sensitive powder with a CO2 laser. The SLA system consists of a CO2 laser, a vat of powdered ABS like plastic material, and a computer system that controls the entire machine. All that you need to get started is a 3d model of your desired prototype, either from a CAD software package or a 3d animation software package, this is all that is necessary to provide build information for an SLS system. Special software then cuts the 3d, or CAD file into thousands of layers per inch, called slices, and outputs the slice data to the SLS system.
First a platform is coated with a thin layer of ABS like plastic powder. Then a CO2 laser draws the first layer shape onto the powder, melting the first slice onto the platform. After the first slice is melted by the laser the platform then lowers anywhere from 1 to 7 thousandths of an inch, depending on the desired resolution. The recoater arm then sweeps across the top of the previous slice layering a film of powder that is then melted to the previous layer by the CO2 laser. This process repeats as the platform lowers into the machine, the part is built layer by layer. Within a few hours the part is complete, containing most or all of the detail from the original 3d file.
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