The Direct Energy Disposition process can be subdivided into categories based on the energy source for making the material molten, but they are all based on similar principles: DED is similar to the traditional welding process but can produce fine detail which welding cannot. This process can deposit the molten material onto a build platform or alternatively onto a component needing to be repaired/modified. The nozzle can move in multiple directions (five-axis) which gives it freedom of movement not seen in most other AM technologies. The molten material is incorporated into the energy flow, melting and depositing at the same time. With DED, powder or wire is pushed through a nozzle and melted by an intensely focused energy source (usually a laser) at the point of deposition. Directed Energy Deposition – DED The process of Directed Energy Deposition (DED) fuses materials (usually metal) by melting them as they’re being deposited. Complex, high-precision metal and ceramic partsĢ.Ideal for full-colour/high fidelity prototyping.Even after post-processing, the mechanical properties don’t meet the quality of traditionally manufactured parts or PBF prints.Before post-processing, parts are fragile and can crumble easily.Needs to be infiltrated and sintered which causes shrinkage.The powder isn’t melted so few/no issues related to residual stress.Can be integrated with most traditional foundry processes.A wide range of powdered materials is available.Multi-colour parts possible (non-metallic parts).Different mechanical properties achievable. Can produce complex, high-precision parts – high resolution equal to PBF.This process is different to most other AM technologies because it doesn’t use heat to fuse the material. After the build process, the product undergoes post-processing. The printer creates the object by bonding the powder wherever the print-head has deposited the binder, layer by layer. A roller spreads a layer of powder over the build platform then the print head moves horizontally and sprays the binder agent onto selective areas of the powder layer. However, unlike PBF, a liquid binding agent is used to bond parts instead of a laser/beam. BJT uses the same powder-spreading methods as powder bed fusion (PBF). Binder Jetting – BJT Binder Jetting is a process in which a liquid bonding agent is selectively deposited to join powder materialsīinder Jetting (BJT) produces parts by selectively depositing a binding agent over a powder bed. With this in mind, in this post, and as per the ISO ASTM 52900 which relates to additive manufacturing general principles and terminology, we’ve produced a helpful guide to the seven core technologies of additive manufacturing, including their advantages and disadvantages. As companies invent new AM techniques, they tend to create new terms even though the core techniques are similar. Additive manufacturing (AM) has fundamentally changed how parts across many industries are designed and fabricated.
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