Physical Modeling for Dynamic Control of Melting Process in Direct-SLS

Date
2001
Authors
Ahn, S.
Murphy, J.
Ramos, J.
Beaman, J.J.
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Abstract

During the melting process by laser irradiation, it is essential to understand the phase change processes to get high quality Direct SLS parts especially when highorder scanning paths are needed. This process is a transient three -dimensional heat conduction problem with a moving heat source and a moving phase boundary. The process can be simplified to a one-dimensional moving boundary model using appropriate assumptions. To implement a real-time control strategy, approximate solutions were found using three methods. Experiments using a CW CO2 laser were performed on low carbon steelsamples to verify the models’ results. By using first order differential equations derived from the model, multi-input multi-output (MIMO) control strategies can be applied.

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