Additive Manufacturing - Fused Deposition Modelling (FDM) Technology:

Fused Deposition Modeling (FDM) was developed by Stratasys in Minnesota. In this process, a plastic or wax material is extruded through a nozzle that follows the part's cross sectional geometry layer by layer. The build material is usually supplied in filament form, but some setups utilize plastic pellets instead. The nozzle contains resistive heaters that keep the plastic at a temperature just above its melting point so that it flows easily through the nozzle and forms the layer. The plastic hardens immediately after flowing from the nozzle and bonds to the layer below. Once a layer is built, the platform lowers, and the extrusion nozzle deposits another layer. The layer thickness and vertical dimensional accuracy is determined by the extruder die diameter, which ranges from (0.1 to 0.3 mm). In the (X,Y) plane, (0.025 mm) resolution is achievable. A range of materials are available including ABS, polylastic, polyamide, polycarbonate, polyethylene, polypropylene, and investment casting wax.

Explaining video for the process:

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تقنيات التصنيع بالإضافة -|4|- التصنيع بالإضافة - تقنية النمذجة بترسيب المادة المنصهرة (Fused Deposition Modelling -...

Posted by Eng. Rami Khalil on Thursday, April 16, 2015