Electric heating – Metal heating – By arc
Patent
1994-09-30
1996-06-25
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
B23K 2600, B22F 100
Patent
active
055302211
ABSTRACT:
A temperature-controlled laser sintering system includes a laser beam 12 which is focussed onto a sintering bed 38 by a focussing mirror 26 and a set of scanning mirrors 32, 34. Thermal radiation 114 emitted from the sintering bed 38 are imaged to the scanning mirrors and to a dichroic beamsplitter 110 which reflects such radiation but passes the wavelength of the laser beam 12. The radiation 118 is focussed onto an optical detector 126 which provides a signal on a line 128 to a power control circuit 104. The power control circuit 104 controls a modulator 100 which modulates the power of the laser beam 112 so as to maintain the thermal radiation emission 114 (and thus the temperature at the sintering location) at a substantially constant level.
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Benda John A.
Parasco Aristotle
DePardo Gerald L.
Evans Geoffrey S.
United Technologies Corporation
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