Speaker
Description
Additive manufacturing (AM) is a fabrication process that uses digital information from a computer-aided design file to stack 2D layers of various materials to produce a 3D object, without requiring any part-specific tooling. The use of AM technology in ceramics has attracted significant attention as it can overcome the serious limitation of controlling the complex 3D structure based on the brittleness of the ceramics, and has advanced remarkably in the last decade. The digital light processing (DLP) technology, which can produce 3D complex structures with high structural accuracy and precision using a light source of a projector to cure photo-curable polymer, is one of the representative AM technologies. However, it still has limitations in its application to multi-material AM. Our group has developed an original DLP-based system, which has been designed specifically to overcome the complications of the typical vat-type DLP system. Our system consists of a multi-film-type material feeding system with a 180-horizontally rotatable stereolithography module and a unique washing module, to prevent contamination between different materials, for structures with multi-material distribution. The system and its processing have been successfully optimized for 15 types of materials. Using this system, we have been able to precisely control one-layer thickness from 5 m and co-print multiple components in one structure after considering the thermal behavior of each material with a high resource efficiency. The effectiveness of our technology has been evaluated by a collaboration with Fraunhofer IKTS based on the ICON (Fraunhofer project) and Eureka (KIAT project) projects since 2018. We have confirmed the printability of the functionally graded material structures as well as core-shell structures using two different functional materials.
References
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| Keywords | Additive manufacturing, digital light processing, Multi-material |
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