C+S May 2022 Vol. 8 Issue 5 (web)

The more opportunities metal additive manufacturing opens up to im- prove manufacturing capability, the more challenges industry profes- sionals face on their way to reach material and cost efficiency, design flexibility, and better performance of their solutions. Looking to overcome the limitations of existing additive manufactur - ing (AM) technology and unlock AM’s full potential, Desktop Metal, an award-winning metal 3D printer manufacturer, turned to AMC Bridge to advance the Live Parts™ solution for real-time shaping of metal parts. Client Desktop Metal (NYSE: DM), based in Burlington, Massachusetts, is pioneering a new generation of additive manufacturing technologies focused on producing end-use parts. The company designs and markets 3D printing solutions for all scales of production—from complex pro - totypes and on-demand tooling to the rapid manufacture of thousands of parts. Founded in 2015 by leaders in advanced manufacturing, metallurgy, and robotics, Desktop Metal addresses unmet challenges of speed, cost, and quality to make metal 3D printing an essential tool for engineers and manufacturers worldwide. Challenges Advancing at a rapid pace, metal 3D printing has already overcome the geometric limitations of conventional manufacturing processes, creating new freedom for part shapes design. Nowadays, metal ad- ditive manufacturing technologies allow generating highly complex, lightweight, and stable structures that have never been possible with traditional manufacturing techniques, such as machining and casting. However, a lot of manufacturers and engineers are still challenged by the appropriate ways of using these technological advancements. To demonstrate advantages of the latest innovations that enable creat- ing light and strong designs similar to shapes found in nature, Desktop Metal had an idea of upgrading Live Parts, their existing technology, applying a growth-based approach, where parts grow similar to plants in the real world, that is, they become stronger in areas of high stress and strain. The growth algorithm was also aimed at improving the gen- erative process by automatic handling of both design and manufactur- ing constraints. Besides, the client wanted to seamlessly integrate Live Parts into the CAD system environment. AMC Bridge Advances Real- Time Generative Design Technology: Desktop Metal’s Live Parts Case Study

With a proven track record of successful CAD interoperability devel- opments, AMC Bridge was an ideal candidate for the project. Solution To fulfill the client’s needs, the AMC Bridge development team ex - tended the functionality of the existing Live Parts technology and integrated it into SOLIDWORKS 3D CAD package. Live Parts is a generative design tool that applies morphogenetic principles and advanced simulation to auto-generate part designs and generates new parts based on initial constraints specified by the user— restraints, loads, and so on. The tool produces geometry for lighter- weight, strong metal parts that can be efficiently printed. The Live Parts functionality enables users to: • Generate real-time parts fromscratch using only initial constraints. • Easily set constraints and loading conditions. • Create optimized, manufacturing-ready models in a matter of minutes, mainly because of GPU-reduced design time. • Control the modeling process. • Directly export design changes to SOLIDWORKS and other CAD software for refinement, finite element analysis, and modeling. • Easily adjust parameters in real time throughout the ‘growth’ process: • Select material properties and create a particular material. • Set up force magnitude and direction. • Set up gravity direction. • Tune up the safety factor, which affects the part’s thick - ness and robustness. • Ensure integration between CAD software and Live Parts to receive fast optimization. • Export files in the format needed for the manufacturing method selected by end users. • Generate highly optimized parts that can stand up to strenuous conditions. Aimed to ensure quick generation of optimized, manufacturing- ready models in a couple of minutes, Live Parts runs in the cloud on NVIDIA CUDA GPU–accelerated virtual machines. Process To achieve maximum efficiency during the development process, the AMC Bridge team of experienced professionals divided the scope of work into the following milestones: • General functionality extension, development of the UI, core algorithms, and algorithms for growth control. • Performance improvement using NVIDIA CUDA GPU: • Face strain computations for voxels. • Triangles snapping to initial mesh geometry. • Full implementation of the SOLIDWORKS extension that al - lows creating input models for Live Parts. • Development of the application update mechanism. • Development of the web application to control Live Parts de - ployment on the Paperspace® cloud.


May 2022 csengineermag.com

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