SYMPOSIA PAPER Published: 26 February 2022
STP163720210019

Conversion of In-Process Optical and Thermal Data into a Single 3D File Representing Printing Process in Powder Bed Fusion

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Rapid development of additive manufacturing technologies leads to an increasing demand for quality control of printed parts. While in-process monitoring systems and posttesting technologies have been developed to inspect the part quality, there is not yet a well-established method that specifies the procedures and requirements to convert the extracted in-process layer-wise information into a single three-dimensional (3D) file for quality evaluation and control. In this study, an off-axial imaging system utilizing optical and thermal cameras is deployed to acquire in-process optical and thermal images of the powder bed fusion process. Image registration and analyses are then performed on the acquired images to extract the in-process layer-wise data (e.g., coordinates, gray value, and temperature) associated with the printing process. Based on a comparison of file formats commonly used in industrial software, the Extensible Markup Language file format was selected, which is specified by post-processing software, and further propose procedures for constructing a single 3D file from the in-process data to represent the printing process and evaluate the printing quality. This work provides guidelines for conversion of in-process data into 3D files and contributes to in-process monitoring and quality control of additively manufactured parts.

Author Information

Zhang, Xuan
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, SG
Nguyen, Ngoc-Vu
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, SG
Tran, Tuan
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, SG
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Details
Pages: 75–91
DOI: 10.1520/STP163720210019
ISBN-EB: 978-0-8031-7722-2
ISBN-13: 978-0-8031-7721-5