Direct Metal Laser Sintering, Metal Selective Laser Sintering (SLS)
Direct metal laser sintering (DMLS) is an additive metal fabrication technology developed by EOS out of Munich, Germany, sometimes also referred to by the terms selective laser sintering (SLS) or selective laser melting (SLM). The process involves use of a 3D CAD model whereby a .stl file is created and sent to the machine’s software. A technician works with this 3D model to properly orient the geometry for part building and adds supports structure as appropriate. Once this "build file" has been completed, it is "sliced" into the layer thickness the machine will build in and downloaded to the DMLS machine allowing the build to begin.
Direct Metal Laser Sintering Sample
  Advantages
1. Compared with traditional manufacturing techniques, the speed of DMLS is the most obvious because no special tooling is required and parts can be built in a matter of hours.
2. DMLS allows for more rigorous testing of prototypes. Since DMLS can use most alloys, prototypes can now be functional hardware made out of the same material as production components.
3. DMLS is also one of the few additive manufacturing technologies being used in production. Since the components are built layer by layer, it is possible to design internal features and passages that could not be cast or otherwise machined.
4.Complex geometries and assemblies with multiple components can be simplified to fewer parts with a more cost effective assembly. DMLS does not require special tooling like castings, so it is convenient for short production runs.
  Applications
  • Product design, rapid production of high-precision injection molds.
  • Metal parts, fire test parts, fixture direct manufacturing and model demonstration test.
  • Research and development of implants, teeth, skull repair, prosthetics and medical equipment.
  • Development of new products.
  • Creative design and display of culture, creativity, clothing, household goods and other.

  •   Technical Overview of Selective laser sintering (SLS)
    The DMLS machine uses a high-powered 200 watt Yb-fiber optic laser. Inside the build chamber area, there is a material dispensing platform and a build platform along with a recoater blade used to move new powder over the build platform. The technology fuses metal powder into a solid part by melting it locally using the focused laser beam. Parts are built up additively layer by layer, typically using layers 20 micrometres thick. This process allows for highly complex geometries to be created directly from the 3D CAD data, fully automatically, in hours and without any tooling. DMLS is a net-shape process, producing parts with high accuracy and detail resolution, good surface quality and excellent mechanical properties.

       Materials

    specification   Technical Specifications for Direct Metal Laser Sintering
    Technique Specifications of EOSINT M 280 Equipment
    Building volume (including building platform) 250 mm x 250 mm x 325 mm (9.85 x 9.85 x 12.8 in)
    Laser type Yb-fibre laser, 200 W oder 400 W (optional)
    Precision optics F-theta-lens, high-speed scanner
    Scan speed up to 7.0 m/s (23 ft./sec)
    Variable focus diameter 100 - 500 μm (0.004 - 0.02 in)
    Power supply 32 A
    Power consumption maximum 8.5 kW / typical 3.2 kW
    Nitrogen generator integrated
    Compressed air supply 7,000 hPa; 20 m3/h (102 psi; 706 ft3/h)
    Argon supply 4,000 hPa; 100 l/min (58 psi; 3.5 ft3/min)(optional)

    cases DMSL Prototype Sample
    • Metal SLS rapid manufacturing sample
      Metal SLS rapid manufacturing sample
    • Metal SLS rapid manufacturing sample
      Metal SLS rapid manufacturing sample
    • Metal SLS rapid manufacturing sample
      Metal SLS rapid manufacturing sample

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