3D Printing News Briefs, August 27, 2022: Research, Partially 3D Printed Engines, and More – 3DPrint.com

The Additive Manufacturing Coalition has announced its newest member; that’s what we’re starting with in today’s 3D printing brief. Separately, GE Aerospace’s partially 3D-printed engine orders are high. In research, a multi-university team is working on synchronous multi-robot additive manufacturing, and researchers at Colorado State University are 3D printing carbon fiber composites in a short time, but with minimal heat. . Finally, researchers from Singapore and China have proposed an approach to incorporating alternative proteins, such as crickets, into edible inks.

SLM Solutions joins the additive manufacturing coalition

The Additive Manufacturing Coalitionthe national association recognized as the voice of AM with decision-makers and stakeholders, announcement this TDM solutions is its newest member. With its US headquarters in Michigan, SLM Solutions invented the Selective Laser Melting (SLM) process and provides its integrated multilaser metal AM solutions to customers around the world in major industries including automotive, aerospace, aviation, energy, defence. , and health sciences. The company is focused on developing and distributing the most production-oriented metal 3D printing systems, with a global install base of approximately 750, and will help realize the federal government’s vision for additive manufacturing .

“Having SLM Solutions as a member brings a new voice to our Coalition when we talk to decision makers in Washington, DC about additive manufacturing,” said David Cherington, Executive Director of the Additive Manufacturing Coalition. . “As the company that invented the selective laser melting process and how this process expands the possibilities of AM [additive manufacturing]SLM Solutions helps define the possibilities of AM today and in the future. »

Increase in partial 3D printed engine controls by GE Aerospace

GE Aerospace, formerly GE Aviationreports that demand and the number of orders for its partially 3D-printed motors has skyrocketed, helping to boost its revenue by 27% in the last quarter. This GE division uses AM to produce its fuel injectors, which are said to improve fuel efficiency by 15%, and 3D print other components that support the overall product. GE has seen growth in its aerospace and aircraft division, particularly with its engine hardware and services, and that growth has been partially supported by an agreement with Boeing, which will have GE engines used on the 737-10 in aircraft. Delta and Qatar Airways.

In recent financial reports, GE indicates that advances in 3D printing products may continue to drive revenue growth; for example, its partially 3D-printed Avio Aero Catalyst engine will be used in the Airbus Eurodrone surveillance vehicle. Last year, GE Aerospace transitioned from casting to metal 3D printing for four turbine parts, and its Singapore MRO plant is the first to be licensed to use metal additive manufacturing for jet engine component repairs commercial.

Collision-free multi-robot additive manufacturing

A collaborative team of researchers from Texas A&M University (TAMU), University of Michigan, University of Texas at Austin (UT Austin), and University of Arkansas has developed a unique approach for collaborative 3D printing robots (synchronous multi-robot AM). Their method is described in a published article, titled “LayerLock: Layered collision-free multi-robot additive manufacturing using topologically nested space-filling shapes”, and is based on a class of topologically nested shapes called Delaunay Lofts. These forms result, as they explained, “from stacking layers of Voronoi partitions of a set of moving Voronoi sites based on wallpaper symmetries”. The team developed an algorithm to volume partitioning, cell sequencing, and path planning for a two-robot AM system, which is then numerically evaluated for parameters such as cell resolution and part orientation. They demonstrated their approach using the two-robot system to 3D print topologically nested space-filling structures.

“Our approach is based on two key ideas. First, each layer of a Delaunay Loft is simply a tessellation of convex polygons allowing for easy cell division for simultaneous collision-free material deposition. Second, the unique transition of Voronoi cells along the layers naturally leads to topological interlocking, thus providing better energy absorption capacity compensating for the loss of structural strength due to segmented printing,” states the abstract. “In this work, we limit our current investigation to a two-robot system and expand the LayerLock algorithm consisting of three steps: (1) a division based on the distance of Voronoi cells at each layer of the Delaunay Loft, (2) a moving front strategy to determine the sequence of cells for each robot, and (3) the path printing generation based on cell sequence, allowing synchronous collaboration.

3D printing of freeform carbon fiber reinforced materials

Search outside the University of ColoradoThe mechanical engineering department of focuses on freeform 3D printing of carbon fiber reinforced material—especially thermosetting polymer composites. The material is light but strong, and the researchers would be among the first in the world to achieve this type of composite 3D printing, where the material hardens on its own by unfolding on a heated surface, without the use of a mould. or support structure. The technique combines both free-form and layer-by-layer 3D printing strategies, without requiring a post-curing step. Along with two graduate students, Mostafa Yourdkhani, assistant professor of mechanical engineering at the Walter Scott, Jr. College of Engineering, published a paper on the job, which details 3D printing carbon fiber composites with minimal heat in a very short time. This could lead to a reduction in the time, energy and cost of producing this type of complex structure.

“3D printing of fiber-reinforced thermoset composites is desirable for the rapid fabrication of 3D composite objects with minimal tooling. One of the major issues with 3D printing of thermoset composites is the low cure rate of matrix resins, which prevents rapid curing and stiffening of composite materials during the printing process and capture of print geometry. desired,” the summary reads. “Here we demonstrate a new technique for on the spot printing and curing carbon fiber reinforced thermoset composites without any post-curing or post-curing steps. When extruding and depositing the composite ink from a printing nozzle, the ink is hardened by front-end polymerization, leading to rapid printing of high quality composites. Adaptation of processing conditions enables free or fast printing of 3D composite objects with zero void content and highly oriented carbon fiber reinforcements.

3D printing edible inks with alternative proteins

Optimized ink printing of pyramid, octopus and turtle from left to right of different protein inks.

Finally, while people in some parts of the world are more accustomed to consuming alternative sources of protein, such as algae, insects and plants, this is an uncomfortable thought for many. But as the population continues to grow, so does the demand for protein-rich foods, raising concerns about increased land and water consumption, as well as greenhouse gases. . A team of researchers from the Singapore University of Technology and Design (SUTD), the University of Electronic Science and Technology of China (UESTC), Nanyang Technological Universityand Khoo Teck Puat Hospital work together to make the idea of ​​alternative proteins, such as crickets, more palatable by mixing them with common foods, such as carrots, to create extrudable ink for 3D printing attractive shapes and textures. This type of work is usually done by trial and error, but this team has developed a systematic engineering approach— based on established response surface methodology — that can more efficiently incorporate alternative proteins into edible inks. In their study, they explain how they used the core composite design approach to optimize different formulations and experimented with proteins like soybean, sericin, cricket, and black soldier fly larvae.

“This research study can also be generalized for other food ingredients and the response of food inks like texture, printability, water seepage can be included for optimization,” explained Aakanksha Pant, Partner. research fellow and corresponding author of the study. “The response surface method approach may lead researchers to adopt a similar method to optimize 3DFP edible inks that make up complex multicomponent food ingredients.”