Control of melt pool temperature and deposition height during direct metal deposition process

摘要: This paper presents a hybrid control system that is able to improve dimensional accuracy of geometrically complex parts manufactured by direct metal deposition process. The melt pool height monitored three high-speed charged couple device cameras in triangulation setup. temperature dual-color pyrometer. A two-input single-output including master controller and slave used both growth at each layer. rule-based the uses generalized predictive algorithm with input constraints. When above prescribed layer thickness, blocks actions from decreases laser power avoid over-building. below bypasses dynamically adjusts temperature. achieve stable avoiding over-building under-building through heat control. 3-D turbine blade improved geometrical demonstrated using system.