Powder metallurgy processes – Powder metallurgy processes with heating or sintering
Patent
1993-10-20
1995-06-27
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
419 7, 419 10, 264 25, 264 401, 264 406, B22F 100, B29C 3900
Patent
active
054277337
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.
REFERENCES:
patent: 4938816 (1990-07-01), Beaman et al.
patent: 5026964 (1991-06-01), Somers et al.
patent: 5155321 (1992-10-01), Grube et al.
Benda John A.
Parasco Aristotle
Chi Anthony R.
DePardo Gerald L.
United Technologies Corporation
Walsh Donald P.
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