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Additive Manufacturing (DRY Process (Selective Laser Sintering (SLS) (How…

- - - - UV Ray
      - Movable Build Platform (up and down)
      - vat of UV-curable photopolymer
    - - Concept models (for form and fit studies)
      - Master patterns for molding techniques
    - - Slicing Process
      - Each layer is constructed from UV laser directed by X and Y scanning mirrors
      - Laser traces the cross section and solidifies the area
      - After each layer is complete, build platform is indexed down
      - A recoater blade moves across the surface (to ensure thin coat of liquid resin is evenly spread)
      - Liquid material is hardened on contact
      - Laser continues to trace and form layer atop the previous layer (building from the bottom up)
      - A chemical bath (remove excess resin)
      - Ultraviolet oven (cure the part and remove support structures)
    - - 1.CAD data is sliced into thin cross-sections/layers
      - Data is transferred to an SLA system
      - 3D CAD data input into system
- - - - A process which uses laser selectively to trace the surface of powder and sinters the material together
    - - PEEK materials
      - Powdered Nylon 11, Nylon 12
    - - highly durable
      - heat and chemical resistant
      - light-weight
      - amorphous materials (rough surface finishes and porous)
    - - Powder feed piston rise to distribute layer of material and part building cylinder lowers to layer thickness
      - Other powder feed piston also lowers to accommodate any surplus material
      - Slicing Process
      - Deposited powder is heated until just below its melting point
      - 1.Atmosphere in the process chamber heated to operating temperature and chamber filled with nitrogen
      - Laser draws one cross section to sinter the powder particles
      - Un-sintered powder remains to support next layer and then distributed,levelled and sintered again
      - After cooling, part building cylinder raises to allow part to be removed
      - Cleaning (excess powder is cleaned off by brushing or air-blowing)
    - - system slices the part into slices
      - 3D CAD data ( .stl ) input into system
      - Data is transferred to machine
  - - - Production-grade thermoplastic material
      - Wax (support material)
    - - Concept models
      - Functional prototypes
      - Manufacturing aids
      - Low-volume end-use parts
    - - Thin thread-like spools of thermoplastic and support material are used to create each cross section of the part
      - Uncoiled material is slowly extruded through the dual heated nozzles
      - Slicing
      - Extrusion nozzles precisely lay down both support and thermoplastic material upon preceding layers
      - Extrusion nozzles move in a horizontal X-Y plane.
      - 6.The build platform moves down, building the part layer by layer
      - Finished part is removed from the build platform and cleaned of its support material
      - Finishing the part (smooth it, hand sanding, assembly and cosmetic paint)
    - - PLA (Polyactic Acid) -Non Toxic
      - ABS
    - - 3D CAD data input into system
      - System slices the CAD data into layers
      - Data is transferred to machine