Method for performing multiple beam laser sintering employing fo

Details Method for performing multiple beam laser sintering employing fo Method for performing multiple beam laser sintering employing fo

1993-10-20

1995-02-28

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

419 61, 264 25, 264 401, B22F 300, H05B 100

Patent

active

053934822

ABSTRACT:
A multiple beam laser sintering device includes a sintering beam 64 having a focal point at a powder bed 68 and at least one defocussed laser beam 116 incident on a region near the focal point of the focussed beam 64. The sintering beam 64 raises the temperature of the powder 84 to the sintering temperature. The defocussed beam 116 raises the temperature of the material surrounding the sintering beam 64 to a level below the sintering temperature, thereby reducing the temperature gradient between the sintering location and the surrounding material. Thermal radiation may be measured from one or both beams and used to control the power of one or both beams and the power of one or both beams may be controlled to maintain the temperature at a desired level. Alternatively, a plurality of defocussed beams may be used to provide either a plurality of thermal gradient steps, or to control the temperature of each region around the sintering point independently.

REFERENCES:
patent: 4906959 (1990-03-01), Zonneveld et al.
patent: 5026964 (1991-06-01), Somers et al.
patent: 5070072 (1991-12-01), Mir et al.
patent: 5155321 (1992-10-01), Grube et al.

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