Method for selective laser sintering with layerwise cross-scanni

Details Method for selective laser sintering with layerwise cross-scanni Method for selective laser sintering with layerwise cross-scanni

1990-11-09

1992-10-13

Albritton, C. L.

Electric heating

Metal heating

By arc

B23K 2600

Patent

active

051553244

ABSTRACT:
An apparatus and method for producing parts by selective laser sintering are disclosed. The disclosed method selectively sinters a first layer of heat-fusible powder by directing a laser beam so that it scans the first layer in a first direction to sinter a first cross-section of the part. A second layer of the heat-fusible powder is then disposed over the first layer, and the next cross-section of the part is selectively sintered by the laser being scanned in a different direction from the first direction, for example in a direction perpendicular to the first direction. The cross-scanning resulting from scanning in different directions provides parts with structural strength which is not dependent upon orientation, with more uniform surfaces and textures, and with reduced distortion. In addition, each of the layers may have its outlined traced prior to the scanning, to further define the edges of the cross-section.

REFERENCES:
patent: 3848104 (1974-11-01), Locke
patent: 4587396 (1986-05-01), Rubin
patent: 4818562 (1989-04-01), Arcella et al.
patent: 4863538 (1989-09-01), Deckard
patent: 4938816 (1990-07-01), Beaman et al.
patent: 4944817 (1990-07-01), Bourell et al.
patent: 5017317 (1991-05-01), Marcus
patent: 5017753 (1991-05-01), Deckard
Deckard, "Selective Laser Sintering," Doctoral Thesis (University of Texas, Dec. 1988).
Deckard, "Part Generation By Layerwise Selective Sintering" (University of Texas, May 1986).

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