Title: Innovations in Direct Digital Manufacturing Using Multi-material, High-Speed 3D printing, and Design for Additive Manufacturing

Abstract:

Direct Digital Manufacturing (DDM) incorporated additive manufacturing (AM) capabilities of fabrication of functional parts directly from CAD file with ultimate ease. Unlike rapid prototyping which produces prototypes, DDM uses various AM tools like page-wide printing, multi-material, topology optimization for on-demand, low capital expenditure, unlimited complex design, and innovative products for mass production and customization. Multi-material printing coupled with DDM has opened new horizons for manufacturers to develop a totally new market with minimal risk to time and cost. The upcoming key technology and tools for DDM would be high-speed 3D printing with page-wide technology which is a hybrid process, applied with the concept of design for additive manufacturing and post-processing. Design for additive manufacturing with unlimited design ease enables the user to design innovative cellular lattice structures and intricate geometries. These structures bring superior properties like good strength-to-weight ratio, high surface area, higher load-bearing capacity, excellent shock, and energy absorption compared to solid material with conventional manufacturing. The major challenges of DDM include post-processing 3D printed parts but the NTUST concept of high-speed printing, supportless lattice structure, and ventilated lattice structure easily mitigated this problem. Similarly, 1 st ever successful attempt of additively manufactured wave springs has proven its worth for the different industrial applications with superior mechanical properties to other types of springs. The designing of lattice structures with different tessellations and foam filling lattices designs gave the researchers a new direction to design application base end-use components. The foam in the printed cellular as well as the wall thickness of the structure significantly enhances the mechanical properties, particularly energy absorption capabilities which are isotropic in behavior. Also, research is underway to develop new materials for better printability with improved mechanical properties of 3D manufactured parts. Hence, it is evident that AM will get its boom due to the filling of secondary material inside the cells for a vast variety of industrial applications.

Biography:

Prof. Jeng-Ywan Jeng currently is a distinguished professor at the National Taiwan University of Science and Technology, Taiwan, and an Ex-Director of High-speed 3D printing center. His research is multi-dimensional and full of innovative concepts, mainly focused on High-speed additive manufacturing, digital manufacturing, lasermaterial interaction, design for additive manufacturing, 3D printing technology, and multi-material printing. He is the founder of start-ups like T3D, Taiwan tech digital. He was a consultant of many leading industries like Tatung, Pouchen, Franz, Aviocast, and universities including Lunghwa University of Science and Technology, Taiwan. He is also an independent director of Global Wafers, ANT precision industry, and ACTRON technology. He earned his PhD from The University of Liverpool, UK.