Recently under the rubric of the Geneva Motor Show 2015, I mentioned the Light Cocoon concept car produced by the consultancy EDAG. This work highlighted the possibilities of additive manufacturing methods. Does it have a meaningful place in the future of car manufacture?
First, let´s find out a bit more about additive manufacturing. In contrast with standard mass production, additive production relies on building up material layer by layer using lasers to activate and bind particles together to the required shape. Lasers follow a path through a mass of granules and cause selected ones to fuse. The path is defined by a mathematical model generated using CAD programmes. Other additive methods use extrusions of hot plastic laid down in layers. Again, the layers are defined by CAD data. The key thing is that material is addded and not removed. (Sculpture using stone is subtractive manufacturing, so is wood turning.) In automotive production the methods used to make thing usually involve stamping where a flat sheet of metal is pressed into the required shape using a specially made one off tool. In moulding processes a liquid is introduced to an empty form and takes up the shape of the tool. In both cases the CAD data is mediated by costly forms or dies which need to be milled slowly from tough materials. These are usually finished (polished) by hand to
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