研究目的
To monitor the layer thickness during the laser powder bed fusion (LPBF) process and evaluate the effect of processing conditions on the deposited layer thickness and thermal contraction.
研究成果
The study demonstrates the potential of using a laser displacement sensor as an in situ process monitoring tool in LPBF. Significant variability in the deposited powder layer thickness and thermal contraction was observed, which could impact the quality of the consolidation and density in the part.
研究不足
The measurement spot size of the sensor may cause variability in the surface height measurements. The study focuses on a single cylindrical component and may not represent all LPBF processes.
1：Experimental Design and Method Selection:
A laser displacement sensor was integrated into the build chamber of an LPBF machine to monitor the height of the top surface layer during a build.
2：Sample Selection and Data Sources:
A cylindrical component with varying interlayer dwell time was manufactured.
3：List of Experimental Equipment and Materials:
Keyence LK-G80 laser displacement sensor, Renishaw AM250 machine.
4：Experimental Procedures and Operational Workflow:
The sensor was mounted parallel to the building substrate, and the displacement of the top surface of the part was logged throughout the build.
5：Data Analysis Methods:
The thickness of the deposited powder layer and the thermal contraction were measured and analyzed.
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