Thursday, September 22, 2011
Metal 3D Printing
Technology Review reports: [edited]
Chris Turner, an engineer at EADS Innovation Works near Bristol, England, twists a lever on a boxy black machine, and a porthole opens to reveal a dark cavity with a floor covered in gray powder. An invisible beam sweeps across the powder, and sparks fly. The box is an additive-layer manufacturing machine, sometimes known as a 3D printer, and it is making a small part for an Airbus A380 airliner.
3D printers can make complex shapes that can't be manufactured with conventional techniques. Until recently, however, they couldn't print strong, durable objects. The machine Turner is using can make intricate forms out of high-grade metal, an advance that has allowed researchers to apply the design possibilities of 3D printing to mechanical parts.
The printers use software that works out where the parts need to bear loads and places material just in those areas, halving the weight of the complete part without sacrificing strength. That saves energy, metal, and money. The complex, curving forms that result couldn't be cast in a mold or carved out of a larger block even with the most advanced computer-controlled tools, but they can be printed in a succession of layers tens of micrometers thick.