研究目的
Investigating the implementation of advanced laser control strategies, including jerk-limited motion control and modified G-code, to improve the quality of laser-based powder bed fusion (LPBF) processes.
研究成果
The implementation of jerk-limited motion control and advanced laser power control strategies through AM G-code significantly improves the temporal and spatial accuracy of laser paths in LPBF processes. These advancements enable better coordination of power-velocity-position, leading to more uniform melt-pool sizes and reduced material defects. Ongoing studies are required to further optimize these control strategies for complex geometries and multi-layer builds.
研究不足
The study primarily focuses on single-layer scans and the initial implementation of advanced control strategies. Further research is needed to explore the effects on multi-layer powder 3D builds and to optimize control parameters for various materials and geometries.
1：Experimental Design and Method Selection:
A jerk-limited control strategy was implemented for laser path planning on a LPBF additive manufacturing testbed. The methodology included the development of a modified G-code (AM G-code) for advanced laser power control strategies.
2：Sample Selection and Data Sources:
Experiments were conducted on the NIST Additive Manufacturing Metrology Testbed (AMMT) with a high-speed camera for in-situ melt-pool imaging.
3：List of Experimental Equipment and Materials:
The AMMT was instrumented with a high-speed camera coaxially aligned with the laser, and laser position and power were measured at 100 kHz.
4：Experimental Procedures and Operational Workflow:
Nine square laser scan paths were generated with different motion control parameters. Laser power was constant at 100 W for these scans.
5：Data Analysis Methods:
In-situ melt-pool imaging and ex-situ confocal microscopy were used to analyze the effects of different scan strategies on melt-pool geometry and surface topology.
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