DIRECT METAL DEPOSITION uses inert gas as part of the additive manufacturing process to spray powder onto a surface where it can be melted by a high-power laser beam. Image: Courtesy of Oak Ridge National Laboratory
The U.S. wants back into the manufacturing game, but the industry has had to weigh this desire to create new jobs and stimulate the economy against the reality of competing against lower operating costs elsewhere in the world. Whereas traditional assembly-line work may never return stateside in a big way, manufacturers and government agencies have begun placing bets on additive manufacturing technologies—including 3-D printing—that they believe could represent the industry’s future.
Just what this future will look like and how the U.S. might get there is the subject of a technology showcase this week at The Pennsylvania State University, sponsored by the school’s Center for Innovative Materials Processing through Direct Digital Deposition (CIMP-3D), along with the National Additive Manufacturing Innovation Institute (NAMII).
Additive manufacturing processes create 3-D objects based on a computer file by sequentially depositing thin layers of liquid or powdered metals, polymers or other materials on a substrate. Three-dimensional printing is either synonymous with or a subcategory of additive manufacturing, depending on whom you ask. There are significant differences between the two, however. There are 3-D printers now available for as little as $500, but they produce relatively low-quality objects, suitable as toys, jewelry and other novelties. Industrial additive machines, in contrast, cost at least $30,000—and the laser-based units that make high-quality metal products can cost as much as $1 million.
Of course, additive processes and materials are not nearly mature enough to sustain an entire industry. Layer-by-layer printing of items is simply not possible today at the speed and scale required to replace casting, molding, machining and other traditional manufacturing methods.
The greatest successes in additive manufacturing are taking place in the biomedical industry, particularly in the making of implants that take advantage of the technology’s design flexibility to match a patient’s particular needs, such as a customized hip implant, says CIMP-3D Co-Director Richard Martukanitz. “You could use the high-definition capabilities of additive manufacturing to put scaffolding on the surface of the implant so that you have greater interaction with the patient’s bone material,” he adds. “This is being done in Europe because officials have certified additive manufacturing for use in making biomedical devices and implants. The U.S. is catching up in that area.”
NAMII, the hub of the U.S.’s catch-up efforts, is the first of 15 “innovation institutes” to be established by Pres. Obama’s $1-billion National Network for Manufacturing Innovation strategy introduced in March. Based in Youngstown, Ohio, NAMII is focusing on the development of additive manufacturing technology and processes with help from a planned $45 million in federal funding. The Defense and Energy departments have already provided $30 million of that amount, with NASA, the National Institute of Standards and Technology and National Science Foundation expected to kick in the remaining $15 million over the next four years. A consortium of manufacturing firms, universities, community colleges and nonprofit organizations has promised NAMII an additional $40 million.
Penn State’s CIMP-3D performs research into the use of metals in additive manufacturing for NAMII. At this week’s conference, “we’ll be inaugurating our new center for innovative materials processing, an 8,000-square-foot facility on campus dedicated to additive manufacturing for metallic components,” Martukanitz says.
Such investments are only the beginning if additive manufacturing is to have much impact on the industry as a whole. Still, there are high hopes that additive technologies will play a significant role in manufacturing in the coming decades. The Global Trends 2030: Alternative Worlds report issued in November by the National Intelligence Council (pdf) predicts that additive manufacturing will by 2030 advance beyond its current functions of creating models and rapid prototyping in the automotive and aerospace industries to transform how some conventional mass-produced products are fabricated.