About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
|
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Melt Pool Feature Extraction, Spatial Registration and Layer-to-Layer Control in Powder Bed Fusion |
Author(s) |
Bumsoo Park, Xin Wang, Sandipan Mishra, Douglas Bristow, Robert Landers |
On-Site Speaker (Planned) |
Xin Wang |
Abstract Scope |
Laser Powder Bed Fusion (LPBF) is a well-known additive manufacturing technique that uses a high-power laser to fuse loose metal powder into a solid part. A major issue restricting this technology from wider industrial applications is the lack of part quality assurance. In this paper, a high-speed (2kHz) co-axial near-infrared optical camera setup is implemented for process monitoring and control. The acquisition locations for individual images are estimated based on specified scan paths and scan velocities to create a spatial registration technique. Melt pool thermal features are linked to specific locations instead of time instants, motivating a spatial control strategy to achieve thermal feature uniformity. Based on the spatial mapping of the thermal features, experimental studies are conducted where a spatial layer-to-layer iterative learning controller is implemented to achieve spatial uniformity of the thermal features. The experimental results present a convergence of the thermal features to a uniform level. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |