Method for performing temperature-controlled laser sintering

Details Method for performing temperature-controlled laser sintering Method for performing temperature-controlled laser sintering

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.

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