Journal
RAPID PROTOTYPING JOURNAL
Volume 22, Issue 1, Pages 40-50Publisher
EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/RPJ-04-2014-0046
Keywords
Selective laser melting; CCD-camera; Optical monitoring; Pyrometer; Temperature measurements; Thermal emission
Funding
- Government of the Russian Federation
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Purpose - This paper aims to propose methods for on-line monitoring and process quality assurance of Selective Laser Melting (SLM) technology as a competitive advantage to enhance its implementation into modern manufacturing industry. Design/methodology/approach - Monitoring of thermal emission from the laser impact zone was carried out by an originally developed pyrometer and a charge-coupled device (CCD) camera which were integrated with the optical system of the PHENIX PM-100 machine. Experiments are performed with variation of the basic process parameters such as powder layer thickness (0-120 mu m), hatch distance (60-1,000 mu m) and fabrication strategy (the so-called one-zone and two-zone). Findings - The pyrometer signal from the laser impact zone and the 2D temperature mapping from HAZ are rather sensible to variation of high-temperature phenomena during powder consolidation imposed by variation of the operational parameters. Research limitations/implications - Pyrometer measurements are in arbitrary units. This limitation is due to the difficulty to integrate diagnostic tools into the optical system of a commercial SLM machine. Practical implications - Enhancement of SLM process stability and efficiency through comprehensive optical diagnostics and on-line control. Originality/value - High-temperature phenomena in SLM were monitored coaxially with the laser beam for variation of several operational parameters.
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