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    • 1. 发明申请
    • PROCEDURE AND APPARATUS FOR IN-SITU MONITORING AND FEEDBACK CONTROL OF SELECTIVE LASER POWDER PROCESSING
    • 用于选择性激光粉末加工的现场监测和反馈控制的程序和装置
    • WO2007147221A1
    • 2007-12-27
    • PCT/BE2007/000061
    • 2007-06-20
    • KATHOLIEKE UNIVERSITEIT LEUVENKRUTH, Jean-PierreMERCELIS, Peter
    • KRUTH, Jean-PierreMERCELIS, Peter
    • B29C67/00B23K26/03B29C67/04B22F3/10
    • B23K26/0665B22F3/1055B22F2003/1057B23K26/03B23K26/034B23K26/0342B23K26/342B29C64/153B29C64/393Y02P10/295
    • The present invention relates to a method and a device to monitor and control the Selective Laser Powder Processing. A Selective Laser Powder Processing device comprising a feedback controller to improve the stability of the Selective Laser Powder Processing process is presented. A signal reflecting a geometric quantity of the melt zone is used in the feedback controller to adjust the scanning parameters (e.g. laser power, laser spot size, scanning velocity,...) of the laser beam (4) in order to maintain the geometric quantity of the melt zone at a constant level. The signal reflecting the geometric quantity of the melt zone can also be displayed in order to monitor the Selective Laser Powder Processing process. The present invention allows for the production of three-dimensional objects from powder material and improves the state of the art by compensating variations of the border conditions (e.g. local heat conduction rate) by a feedback control system based on a geometric quantity of the melt zone resulting in e.g. a lower amount of dross material when overhang planes are scanned.
    • 本发明涉及一种监测和控制选择性激光粉末处理的方法和装置。 提出了一种选择性激光粉末处理装置,其包括反馈控制器以提高选择性激光粉末处理过程的稳定性。 在反馈控制器中使用反映熔体区域的几何量的信号来调整激光束(4)的扫描参数(例如激光功率,激光光斑尺寸,扫描速度,...),以保持几何 熔体区域的数量处于恒定水平。 还可以显示反映熔体区域的几何量的信号,以便监视选择性激光粉末处理过程。 本发明允许从粉末材料生产三维物体,并且通过基于熔体区域的几何量的反馈控制系统补偿边界条件(例如局部导热率)的变化来改善现有技术的状态 导致例如 当悬垂平面被扫描时,较少量的浮渣材料。