公开(公告)号：US06621039B2

公开(公告)日：2003-09-16

申请号：US09993720

申请日：2001-11-27

申请人： XinHua Wang ,  YunGan Wang ,  Kuak Choi Lealic Lim ,  Ying Hsi Jerry Fuh ,  Yoke San Wong ,  JiHuan Luo ,  HongBin Cheng ,  YueFeng Yu ,  XiangLin Zhang ,  YaXin Tang ,  Li Lu ,  Xuan Wang

发明人： XinHua Wang ,  YunGan Wang ,  Kuak Choi Lealic Lim ,  Ying Hsi Jerry Fuh ,  Yoke San Wong ,  JiHuan Luo ,  HongBin Cheng ,  YueFeng Yu ,  XiangLin Zhang ,  YaXin Tang ,  Li Lu ,  Xuan Wang

IPC分类号： B23K2628

CPC分类号： B22F3/1055 ,  B22F3/004 ,  B22F2003/1056 ,  B29C64/20 ,  B33Y30/00 ,  Y02P10/295

摘要： A computer-controlled apparatus and method for producing metallic parts by laser melting selected regions of a layer(s) of metal powder at a target area are disclosed. The system includes devices for preheating and maintaining a relatively high temperature, e.g. 400° C., of the metal powder so as to join the metal powder together with relatively low laser power, e.g. a 200W CO2 laser. A major powder depositing mechanism with a scraper and a depositing system for a secondary powder are included in the apparatus that allows the powders to be delivered to the target area for selective melting. The metal powder is preheated at either a dispensing cylinder or the target area through thermal conduction and/or is also heated by a heating plate positioned above the platform through radiation. The corresponding machine structures, such as a motion system and a working chamber, are designed to be able to withstand and operated under the high temperature environment.