研究目的
Investigating the feasibility of a closed-loop control strategy for selective laser melting to stabilize the melt pool temperature and improve part quality.
研究成果
The experiments proved the feasibility of a closed-loop control for the ALM with a complete control cycle time of less than 50 μs, reducing the object temperature variation by about two thirds for the specific example, thereby stabilizing the manufacturing process.
研究不足
The study is limited by the reaction times of components like the laser beam source and the need for improved process monitoring tools to generate reliable signals. Future work includes extending the control approach for more complex object geometries.
1：Experimental Design and Method Selection:
The study employs a model-based feedforward control using finite element heat simulation combined with a robust feedback control using a pyroelectric sensor.
2：Sample Selection and Data Sources:
A bridge geometry made from steel is used to represent the basic principles of the ALM process.
3：List of Experimental Equipment and Materials:
A laboratory ALM machine AconityMIDI with a fiber laser (500 W, 1070 nm, continuous wave) and a 3D scan system, modified for the test setup. A high-speed pyrometer is mounted on-axis for process monitoring.
4：Experimental Procedures and Operational Workflow:
The experiment involves scanning a steel bridge repeatedly with and without closed-loop control to measure the pyrometer signal and laser power adjustments.
5：Data Analysis Methods:
The data is analyzed to compare the temperature deviations between open-loop and closed-loop control strategies.
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