Viper SLA prototype machine and process
Viper SLA machine is a machine with thicknesses down to 0,025 mm can produce components with very small and fine details.
Laserdiameteren are in high resulution fashion only 0,075 mm in diameter which means that this particular model is unique to run threads with little fine detail.
The machine used to manufacture production base for jewelry, small mechanism parts, small parts for hearing aids and medico industry, etc.
Apparatus, stereolithography (SLA)
Fig. 1 is a schematic diagram of an SLA machine. Elevator (A) is placed in a position just below the surface of a vat (B) filled with liquid photopolymer (C). This material has the properties that when the right type of light strikes the liquid becomes solid. The most commonly used photopolymer material requires an ultraviolet light source, but liquids which works with visible light is also used.
A laser beam is transferred across the photo polymeric liquid surface to draw the geometry of the cuts on the object. This results in the liquid solidifies when the laser hits. The laser is moved along XY coordinates via a scanner system (D). This system is fast with high-precision engine that controls the mirrors which in turn is driven by CAD data.
Viper SLA gets data from CAD file
The exact pattern of the laser follows is a combination of information from the CAD system that describes the geometry of the object and then the information from RPT application software. This program modifies the data so they are optimized for the process.
After the layer is completely drawn and where most of emnegeometrien has hardened due to the laser, the elevator is lowered into the carriage a distance equivalent to the thickness of the next layer. The fluid has high viscosity (is thick and sluggish). To expedite this process used a pump-driven recoating sytem. The process is repeated layer by layer until the piece is finished.
Support material must be removed from the SLA topic
In all parts of the topics to be supported with support during manufacture. These are either manually or automatically designed. Finally run the elevator up from the tub where it can drain away. Excess fluid and Support manually removed from the object. The object gets finally a treatment of strong UV light in a box called PostCuring Apparatus (PCA). After this treatment, there might. a light sanding and a glass blowing topics.
SLA generally believed to provide the highest precision and best surface of prototype technology. You work constantly to develop better and more flexible materials that also have more functional properties.
