Temperature-controlled laser sintering

Details Temperature-controlled laser sintering Temperature-controlled laser sintering

B - Operations, Transporting

22

F

B22F 3/105 (2006.01) B23K 26/00 (2006.01) B29C 67/00 (2006.01)

Patent

CA 2174636

A temperature-controlled laser sintering sys- tem 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 cir- cuit (104) controls a modulator (100) which mod- ulates the power of the laser beam (112) so as to maintain the thermal radiation omission (114) (and thus the temperature at the sintering location) at a substantially constant level.

Un système de frittage par laser, à température régulée, comporte un faisceau laser (12) focalisé sur un lit (38) de frittage par un miroir (26) de focalisation et un ensemble de miroirs (32, 34) de balayage. Le rayonnement (114) thermique émis par ce lit (38) de frittage produit des images sur les miroirs de balayage et sur un dispositif de fractionnement (110) dichroïque qui réfléchit ce rayonnement mais laisse passer la longueur d'onde du faisceau laser (12). Le rayonnement (118) est focalisé sur un détecteur (126) optique qui fournit un signal par une ligne (128) à un circuit (104) de commande de puissance. Celui-ci commande un modulateur (100) qui module la puissance du faisceau laser (112) de façon à maintenir l'émission du rayonnement (114) thermique (et donc la température au point de frittage) à un niveau pratiquement constant.

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