In 3D Print Exhibition many, we have to see part of booth display metal material works of some 3D print, mostly for the mechanical parts, these works are printed by metal alloy expensive 3D printer, the cost is high, the price is expensive. Will there be a economical metal 3D printer for the future? The recent emergence of a metal printing new technology -- selective inhibition of sintering (SIS, Selective InhibitonSintering) technique may give a positive answer. Despite the current metal 3D printing has not really into the market, but I believe that in the near future, the desktop metal 3D printer market will be the emergence of a large number of economic type.
        At present, can print 3D metal printing equipment market price is more than $500000, the price does not poor, basically is that some enterprises can not match the price. And in the developed in these devices, the use of welded combined with FDM, causing the printout of the goods is very rough. To this end, a metal printing new technology "selective inhibition of sintering technology", or to change the status quo.
Sintering technology by Behrokh at the University of Southern California, Dr Khoshnevis and his team to develop selective inhibition, basically is with selective laser sintering (SLS) and metal printing technology to other forms of act in a diametrically opposite way. SIS's approach is unique, it is not dependent on laser melting metal alloy layer by layer, but when the metal is not melted makes its forming.
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        In fact, it can be seen as a full of metal powder mold, into the environment of high temperature melting, the final generation with an inhibitor shell solid metal objects, but this kind of inhibitor housing for easy removal. Finally, a metal material 3D print objects completed. Because the laser or electron beam generator using SIS technology is not expensive, so only one PLE print head can spray the liquid inhibitor. Therefore, compared with the existing metal 3D printer, manufacturing cost is reduced a lot. In addition, because the machine printed just 3D the object of a layer of skin, its interior is not involved, so the print faster.
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        The research team has added sucrose inhibitors in materials, is a kind of water soluble organic surface active agent, metal powder used is a bronze alloy, comprehensive point of view, the 3D printing effect is good, but still can be improved, especially in some software and hardware involved in the process the. In addition, printing parts will have some shrinkage phenomenon, and liquid state of the inhibitor "excessive penetration" phenomenon, these will be in the follow-up study to seek a solution. The project is funded by the National Science Foundation funded by University of Southern California's CRAFT labs team engaged in R & D.
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