Simultaneous extraction of profile and surface roughness of 3D SLM components using fringe projection method

Abstract

Purpose

The purpose of this study was expected to simultaneously monitor the surface roughness of each solidified layer, the surface roughness of the metal powder, the outline of the solidified layer, and the height difference between the solidified layer and the metal powder.

Design/methodology/approach

In the proposed approach, color images with red, green and blue fringes are used to measure the shape of the built object using a three-step phase-shift algorithm and phase-unwrapping method. In addition, the surface roughness is extracted from the speckle information in the captured image using a predetermined autocorrelation function.

Findings

The feasibility and accuracy of the proposed system were validated by comparing it with a commercial system for an identical set of samples fabricated by a selective laser melting process. The maximum and minimum errors between the two systems are approximately 24% and 0.8%, respectively.

Originality/value

In the additive manufacturing field, the authors are the first to use fringe detection technology to simultaneously measure the profile of the printed layer and its surface roughness.

Citation

Chen, T.Y.-F., Lo, Y.-L., Lin, Z.-H. and Lin, J.-Y. (2022), "Simultaneous extraction of profile and surface roughness of 3D SLM components using fringe projection method", Rapid Prototyping Journal, Vol. 28 No. 4, pp. 789-801. https://doi.org/10.1108/RPJ-06-2021-0132