Development of monitoring devices becomes crucially important in selective laser melting (SLM) due to the high process complexity and the high value of the products obtained. This work discusses the design of a coaxial monitoring system for SLM using multiple sensors. In particular, an optical model is developed for the propagation of the process emission from the workpiece to the monitoring module. The model is used to determine the field of view (FOV) around the monitored zone. The lens arrangements and the optical filters are chosen according to the model results. They were implemented to construct a monitoring module consisting of two cameras viewing visible and near-infrared wavelength bands, as well as a photodiode viewing the back-reflected laser emission, all integrated in a coaxial configuration. The system functionality is tested with a prototype SLM machine during the processing of 18Ni300 maraging steel, a material known to be prone to porosity. In particular, different remelting strategies were employed as possible correction strategies to reduce porosity. The signals were interpreted as being indicators of the change in absorptivity of the laser light by the powder bed, of the plasma and molten pool, as well as of the evolution of the temperature field.
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April 2018
Research-Article
Design and Implementation of a Multisensor Coaxial Monitoring System With Correction Strategies for Selective Laser Melting of a Maraging Steel
Ali Gökhan Demir,
Ali Gökhan Demir
Department of Mechanical Engineering,
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: aligokhan.demir@polimi.it
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: aligokhan.demir@polimi.it
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Chiara De Giorgi,
Chiara De Giorgi
Department of Mechanical Engineering,
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: chiara.degiorgi@polimi.it
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: chiara.degiorgi@polimi.it
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Barbara Previtali
Barbara Previtali
Department of Mechanical Engineering,
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: barbara.previtali@polimi.it
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: barbara.previtali@polimi.it
Search for other works by this author on:
Ali Gökhan Demir
Department of Mechanical Engineering,
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: aligokhan.demir@polimi.it
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: aligokhan.demir@polimi.it
Chiara De Giorgi
Department of Mechanical Engineering,
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: chiara.degiorgi@polimi.it
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: chiara.degiorgi@polimi.it
Barbara Previtali
Department of Mechanical Engineering,
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: barbara.previtali@polimi.it
Politecnico di Milano Via La Masa 1,
Milan 20156, Italy
e-mail: barbara.previtali@polimi.it
1Corresponding author.
Manuscript received February 23, 2017; final manuscript received November 14, 2017; published online February 5, 2018. Assoc. Editor: Hongqiang Chen.
J. Manuf. Sci. Eng. Apr 2018, 140(4): 041003 (14 pages)
Published Online: February 5, 2018
Article history
Received:
February 23, 2017
Revised:
November 14, 2017
Citation
Gökhan Demir, A., De Giorgi, C., and Previtali, B. (February 5, 2018). "Design and Implementation of a Multisensor Coaxial Monitoring System With Correction Strategies for Selective Laser Melting of a Maraging Steel." ASME. J. Manuf. Sci. Eng. April 2018; 140(4): 041003. https://doi.org/10.1115/1.4038568
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