Презентация по теме 'Production processes in Additive Technologies'
презентация к уроку

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Additive Manufacturing encompasses seven main technologies, each utilising different processes and materials to build objects. These technologies are classified based on how they create layers and the materials they use.

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Seven main additive manufacturing technologies Vat photo-polymerisation Material Extrusion Material Jetting Binder Jetting Powder bed fusion Directed energy deposition Sheet lamination .

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Vat Photopolymerisation This process uses Photopolymerization , in which radiation-curable resins or photopolymers are used to create three-dimensional objects by selectively exposing them to ultraviolet light. When exposed, these materials undergo a chemical reaction and become solid. Only plastics can be printed using these technologies. This process is known for producing high-resolution parts and is commonly used in industries like dentistry and jewellery .

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Binder Jetting Binder Jetting selectively deposits the bonding agent, a binding liquid, to join the powder material to form a 3D part. This process differs from any other AM technology as it does not employ heat during the process like others to fuse the material. This process is suitable for a wide range of materials, including metals and ceramics.

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Directed energy deposition Directed energy deposition technology uses focused thermal energy such as a laser, electron beam, or plasma arc to melt and fuse the material as they are deposited to create a 3D object. These are very similar to the welding process but very finely detailed. The geometric information in a Computer-Aided Design (CAD) solid model is used by LENS 3D printers to autonomously direct the DED process as it builds up a part layer by layer . The two main types of Directed energy deposition technologies are LENS and EBAM. EBAM uses an electron beam, and LENS uses a focused laser to melt the material.

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Material extrusion Material Extrusion is an additive manufacturing technique that uses a continuous thermoplastic or composite material filament to construct 3D parts. Material extrusion was initially developed and patented by S. Scott Crump under Fused Deposition Modelling (FDM) in the 1980s. In this additive manufacturing technique, the continuous filament of thermoplastic is fed through a heated nozzle before being deposited layer by layer onto the build platform to create the object.

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Material jetting In material jetting, build material droplets are selectively deposited layer by layer into the build platform to form a 3D part. This additive manufacturing technique is very similar to standard inkjet printers, where the material droplets are deposited layer by layer selectively to create a three-dimensional object. Once a layer is complete, it is cured by ultraviolet light. Powder material jetting includes the following commonly used printing technologies: UV-cured Material Jetting, Drop-on-Demand (DOD), and nano -particle jetting (NPJ).

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Powder bed fusion Powder bed fusion is an Additive Manufacturing technique that uses a laser or electron beam to melt and fuse the material to form a 3D geometry part. Powder Bed Fusion includes the following commonly used printing technologies: Multi-Jet Fusion (MJF), Direct metal laser sintering (DMLS), Electron beam melting (EBM), Selective heat sintering (SHS), Selective laser melting (SLM), and Selective laser sintering (SLS). This method uses a laser or electron beam to melt the powdered material and fuse it to create a solid object .

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Sheet lamination Sheet lamination technologies use sheets of material to create 3D objects by stacking them and laminating them using either adhesive or ultrasonic welding. Once the object is built, the unwanted areas of the sections are removed layer by layer. Sheet lamination technology is an umbrella term for Ultrasonic Additive Manufacturing (UAM, Selective Deposition Lamination (SDL, and Laminated Object Manufacturing (LOM ).