研究目的
Analyzing transient thermo-optical effects in protective windows for selective laser melting by means of a multi-physical analysis to understand the impact of different scanning strategies and orders of exposure on the focus shift.
研究成果
The multi-physical analyses reveal that the transient thermal focus shift during an SLM process strongly depends on the position of the protective window. Spreading the thermal load in time and space by an adaptive scanning strategy can help reduce the focus shift. The order of exposure has only a small influence on the focus shift for the analyzed set of 37 cubes as test specimens.
研究不足
The study assumes a constant absorptivity of the protective window, which may increase during the SLM process. The influence of the scanning speed and the average laser power on the transient focus shift is not studied. Experimental validation of the simulations is planned but not yet conducted.
1：Experimental Design and Method Selection:
A multi-physical simulation approach is utilized to study the transient thermo-optical effects in SLM. Finite element analyses (FEA) and ray-tracing are coupled to analyze the temperature distribution and focus shift.
2：Sample Selection and Data Sources:
Cubic test specimens are virtually built to simulate the temperature distribution and focus shift.
3：List of Experimental Equipment and Materials:
The optical system consists of a variable focusing unit, a laser scanner, and a protective window made of fused silica.
4：Experimental Procedures and Operational Workflow:
The temperature distribution is simulated for different scanning strategies and orders of exposure. The resulting axial and lateral focus shift is analyzed.
5：Data Analysis Methods:
The exported temperature data are approximated using a Weighted Least Squares (WLS) approximation algorithm. The resulting refractive index profile is linked to Zemax OpticStudio for optical analysis.
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