3D printing: A new brick in the Great Wall
May 1, 2013 Editor 0
ALTHOUGH it is the weekend, a small factory in the Haidian district of Beijing is hard at work. Eight machines, the biggest the size of a delivery van, are busy making things. Yet the factory, owned by Beijing Longyuan Automated Fabrication System (known as AFS), appears almost deserted. This is because it is using additive-manufacturing machines, popularly known as three-dimensional (3D) printers, which run unattended day and night, seven days a week.The printers require an occasional visit from a supervisor to top them up with the powdered materials they use as their “inks”, or to remove a completed item, but apart from that they can be left on their own. They build up the objects they are making one layer at a time, as the ink is sintered into place with a laser in a way that creates little waste and can make shapes impossible to achieve using the traditional “subtractive” technology of lathes, milling machines and cutting tools.Though it is not yet ready for use in mass production (building things up is slower than trimming them down), 3D printing is excellent for making prototypes, customised jobs and short production runs, for there is no need to retool each time…
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