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1. 发明申请

WO1992008592A1 CONTROLLED GAS FLOW FOR SELECTIVE LASER SINTERING 审中-公开
标题翻译：用于选择性激光烧结的控制气体流
公开(公告)号：WO1992008592A1
公开(公告)日：1992-05-29
申请号：PCT/US1991008351
申请日：1991-11-08
申请人： DTM CORPORATION , GRUBE, Kris, W. , FORDERHASE, Paul, F. , CARR, Brian, J. , DECKARD, Carl, R. , ROGGE, William, E.
发明人： DTM CORPORATION
IPC分类号： B29C35/08
CPC分类号： B29C67/04 , B22F3/1055 , B22F2003/1056 , B29C35/16 , B29C64/153 , B29C2035/0838 , B29K2105/251 , B33Y10/00 , B33Y30/00 , Y02P10/295
摘要： An apparatus for fabricating parts by selective laser sintering is disclosed, which includes a baffle (40) for directing gas at the target surface (4). The gas is preferably controlled in temperature to cool, by convection, a layer of heat-fusible powder after it has been selectively laser sintered, to the temperature of the part formed in prior layers. The cooling preferably occurs prior to the application of the next layer of powder. The baffle (40) directs gas flow towards the center of the target surface (4), and exhaust ports are provided on multiple sides of the target surface (4) so that the gas flow is substantially symmetric at the target surface (4). A ring exhaust hood (54) may be suspended over the target surface, so that uniform gas flow may result and so that powder may be disposed over the target surface by way of a counter-rotating roller (18). The baffle (40) may direct the gas directly at the target surface, or may be constructed so that the gas spirals toward the target surface (4) in cyclonic fashion; further alternative baffles can be used to direct the gas at the target surface in a non-uniform, fashion, including turbulent or arbitrary flow patterns.
摘要翻译：公开了一种用于通过选择性激光烧结制造零件的装置，其包括用于在目标表面（4）处引导气体的挡板（40）。优选将气体控制在温度下，通过对流将一层热熔粉末选择性地激光烧结后冷却到现有层中形成的部件的温度。冷却优选在施加下一层粉末之前进行。挡板（40）引导气流朝向目标表面（4）的中心，并且排气口设置在目标表面（4）的多个侧面上，使得气流在目标表面（4）处基本对称。环形排气罩（54）可以悬挂在目标表面上，使得可能导致均匀的气体流动，使得粉末可以通过反向旋转辊（18）设置在目标表面上。挡板（40）可以将气体直接引导到目标表面，或者可以被构造成使得气体以气旋方式朝向目标表面（4）螺旋; 可以使用另外的替代挡板来以不均匀的方式引导目标表面处的气体，包括湍流或任意的流动模式。

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