About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Real-time Process Monitoring and Closed-loop Laser Power Control in Powder Bed Fusion |
Author(s) |
Rongxuan Wang, Benjamin Standfield, Chaoran Dou, Zhenyu Kong |
On-Site Speaker (Planned) |
Rongxuan Wang |
Abstract Scope |
Laser powder bed fusion is one of the most effective ways to achieve 3D printing. However, this method still suffers from quality issues, especially for small features. Generally, the laser power is assumed to be constant, resulting in heat accumulation and an oversize melt pool during the small feature printings. This work develops a closed-loop control system to regulate the laser power based on the thermal camera’s real-time monitoring to address this issue. The desired printing temperature is found by correlating the laser power, the printing accuracy (assessed by an in-house built high-spatial-resolution 3d scanner), and the thermal signatures from a set of thin-wall structure printing trails. The control system is built upon a self-designed multi-sensing laser powder bed fusion platform. The result shows the laser power can be successfully controlled with 1.8 KHz, and a significant improvement in small feature printing accuracy has been observed. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |