Additive Manufacturing - Selective Laser Sintering (SLS) Technology:

Selective Laser Sintering (SLS) was developed at the University of Texas in Austin, by Carl Deckard and colleagues. The technology was patented in 1989 and was originally sold by DTM Corporation. The basic concept of SLS is similar to that of SLA. It uses a moving laser beam to follow and selectively sinter powdered polymer and/or metal composite materials into cross sections of a three dimensional part. As in all rapid prototyping processes, the parts are built upon a platform that adjusts in height equal to the thickness of the layer being built. Additional powder is deposited on top of each solidified layer and sintered. This powder is rolled onto the platform before building the layer. The powder is maintained at an elevated temperature. Unlike SLA, special support structures are not required because the excess powder in each layer acts as a support to the part being built. With the metal composite material, the SLS process solidifies a polymer binder material around steel powder (100 micron diameter) one slice at a time, forming the part. The part is then placed in a furnace, at temperatures in excess of 900 °C, where the polymer binder is burned off and the part is infiltrated with bronze to improve its density. The burn-off and infiltration procedures typically take about one day, after secondary machining and finishing is performed. Recent improvements in accuracy and resolution, and reduction in stair-stepping, have minimized the need for secondary machining and finishing. SLS allows for a wide range of materials, including nylon, glass-filled nylon, SOMOS (rubber-like), and the previously discussed metal composite.

Explaining video for the process:

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تقنيات التصنيع بالإضافة -|5|- التصنيع بالإضافة - تقنية التلبيد الانتقائي بالليزر (Selective Laser Sintering -...

Posted by Eng. Rami Khalil on Monday, May 18, 2015