Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Using laser sintering of particulate material to build...
Patent
1995-06-07
1997-06-17
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Using laser sintering of particulate material to build...
264434, 264460, B05D 103, C04B 3564, C23C 2400
Patent
active
056390700
ABSTRACT:
A method and apparatus for selectively sintering a layer of powder to produce a part as a plurality of sintered layers. The apparatus includes a computer controlling a laser to direct the laser energy onto the powder to produce a sintered mass. The computer either determines or is programmed with the boundaries of the desired cross-sectional regions of the part. For each cross-section, the aim of the laser beam is scanned over a layer of powder and the beam is switched on to sinter only the powder within the boundaries of the cross-section. Powder is applied and successive layers sintered until a completed part is formed. Preferably, the powder dispensing mechanism includes a drum which is moved horizontally across the target area and counter-rotated to smooth and distribute the powder in an even layer across the target area. A downdraft system provides controlled temperature air flow through the target area to moderate powder temperature during sintering.
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Board of Regents , The University of Texas System
Fiorilla Christopher A.
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