overview

the
stereolithography
process

To begin you need to have created a CAD file of a 3D model you want to produce. From here, the model is imported into the SLA software program where it is supported as needed. (These supports generally occur in areas with undercuts and overhangs.) Once all proper supports are in place the file is ready to be "sliced". The "slicing" process is how your CAD file is translated to the Stereolithography machine. At this point the model is "sliced" into .004” thick layers. These layers are what the SLA Machine will use to “grow” the part one layer at a time.

Next the “sliced” model is sent to the SLA machine which will build the part out of epoxy photopolymer. The process begins when the tray attached to the elevator arm slowly descends into the vat at increments of .004” per layer. After the supports are grown the laser then concentrated on growing the parts. It used the mirrors to control the laser and trace out the part in the resin. When the laser touches the resin it is cured and that section of the part is grown. Once the layer is drawn, a sweeper drags across the initial surface to smooth it out and prepare it for the next layer. From here the tray is lowered .004” into the vat where the steps are repeated until there is a three dimensional object dictated by the original CAD file.

When the objected has been completed, the elevator is raised out of the vat where the vat is then allowed to drain. The object is then removed from the tray, cleaned, and placed in a curing oven. The oven consists of a UV Flood Systems that fully cures the prototype. When the prototype finishes curing it is sanded and finished to the customer’s specifications. To see our different finishing techniques Click Here.

resins

DSM Somos 9120
• DSM Somos 9120 is a liquid photopolymer that produces robust functional and accurate parts using stereolithography machines. The material offers superior chemical resistance, a wide processing latitude and excellent tolerance to a broad tempersature and humidity range during and after build. Parts created from Somos 9120 exhibit superior fatigue properties, strong meory retention and high quality up facing and down facing surfaces. Somos 9120 also offers a good balance of properties between rigidity and functionality. The resulting part properties are ideal for master patterns in rubber molding applications.Examples of use include automobile components, electromnic housings, medical products, large panels and snap fit parts.

DSM Somos 11120
• DSM Somos 11120 is a low viscosity liquid photopolymer that produces strong, tough water resistant parts. Somos 11120 offer many properties that mimic traditional engineering plastics including ABS and PBT. This makes the material ideal for applications in the automotive, medical and consumer electronic markets.

DSM Somos 12120
• Somos 12120 is a liquid photopolymer that produces strong, high temperature tolerant, water resistant parts. The Somos 12120 is different from other high temperature resins by incresing in tensile strength and maintaining decent elongation at break after thermal treatment. This makes the product great for automotive and aerospace industries.

DSM Somos 14120
• Somos 14120 is a low viscosity liquid photopolymer that produces tough, water resistant parts. Somos 14120 offer many properties that mimic traditional engineering plastics including ABS and PBT. This makes the material ideal for applications in the automotive, medical and consumer electronic markets.

specifications