Additive Manufacturing

MAY 2018

ADDITIVE MANUFACTURING is the magazine devoted to industrial applications of 3D printing and digital layering technology. We cover the promise and the challenges of this technology for making functional tooling and end-use production parts.

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Page 15 of 43

MAY 2018 Additive Manufacturing 14 TAKING SHAPE To illustrate this phenomenon, Sintavia's machine technician lowers the speed of the vacuum pump as we look inside the active build chamber. As he lowers the speed, turbulences form within the chamber, and the soot that had been flowing steadily from left to right begins to trickle upward toward the laser. Sparks escaping the melt pool are elongated upwards rather than bending in the direction of the gas flow. If you were to look at a 2D cross-section of a part built from these conditions, you would find larger particles of splatter that landed in a nearby melt pool and were re-exposed to the laser. Since builds can take several weeks, it's almost always the case that the powder toward the downstream side of the chamber is "browner, differ- ent-shaped and different-sized" than the unaffected powder in the bed, Hedges says. "Different machines are better at dealing with this issue." Hedges notes that there are numerous adjustments that can be made to keep the chamber environment relatively clean. But some of these adjustments, or "tricks," such as delaying the recoating time in order to let the argon carry the contaminants out of the chamber, add time to the overall process. Sintavia CEO Brian Neff says that the partnership with TNSC is strictly meant to demonstrate to both OEMs and customers that there are ways to scale production. "Everything comes down to cost and speed," Neff says. "Because of what we know about gas flow dynamics, we can make adjustments with our part orientation, the way we design our supports and so on. But we're not trying to be a leading edge in R&D. We want to apply this to scale production, to get faster build times at lower costs, period." OPM250L Metal 3D Printer One Stop Manufacturing Solution Parallel Mode 45,000 RPM Milling Conformal Cooling Quality Surface Finish Exclusive Sodick technology enables the OPM to sinter multiple parts simultaneously without loss in quality or added cost. The OPM hybrid 3D Printer comes equipped with a high speed mill integrated into the machine for finishing parts in-process. 3D Printed cooling channels can improve plastic mold productivity by 30-50%, revolutionizing throughput. With 99.99% density and finish milling capabilities, OPM parts have achieved surfaces as low as 0.22┬ÁmRa. Sodick's OPM line of hybrid Metal 3D Printers is made to achieve a toolmaker's precision. Moreover, only Sodick provides a one stop solution, selling EDM, Mills, and Plastic Injection Molding equipment alongside printers (847) 310-9000

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