Optimization of Surface Roughness in Additive Manufacturing Processes via Taguchi Methodology

Authors: Anjian Chen, Joseph C. Chen

Abstract:

This paper studies a case where the targeted surface roughness of fused deposition modeling (FDM) additive manufacturing process is improved. The process is designing to reduce or eliminate the defects and improve the process capability index Cp and Cpk for an FDM additive manufacturing process. The baseline Cp is 0.274 and Cpk is 0.654. This research utilizes the Taguchi methodology, to eliminate defects and improve the process. The Taguchi method is used to optimize the additive manufacturing process and printing parameters that affect the targeted surface roughness of FDM additive manufacturing. The Taguchi L9 orthogonal array is used to organize the parameters' (four controllable parameters and one non-controllable parameter) effectiveness on the FDM additive manufacturing process. The four controllable parameters are nozzle temperature [°C], layer thickness [mm], nozzle speed [mm/s], and extruder speed [%]. The non-controllable parameter is the environmental temperature [°C]. After the optimization of the parameters, a confirmation print was printed to prove that the results can reduce the amount of defects and improve the process capability index Cp from 0.274 to 1.605 and the Cpk from 0.654 to 1.233 for the FDM additive manufacturing process. The final results confirmed that the Taguchi methodology is sufficient to improve the surface roughness of FDM additive manufacturing process.

Keywords: Additive manufacturing, fused deposition modeling, surface roughness, Six-Sigma, Taguchi method, 3D printing.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1316335

References:

[1] Hunt, L. B. “The Long History of Lost Wax Casting.” Gold Bulletin, vol. 13, no. 2, 1980, pp. 63–79., doi:10.1007/bf03215456.
[2] Holtzer, M., et al. “Foundry Industry – Current State And Future Development.” Metalurgija, vol. 51, no. 3, 2012, pp. 337–340.
[3] “EPA Office of Compliance Sector Notebook Project: Profile of the Metal Casting Industry.” Nepis.epa.gov, Office of Compliance, Office of Enforcement and Compliance Assurance, U.S. Environmental Protection Agency, Sept. 1997.
[4] Wanlong Wang, James G. Conley, Henry W. Stoll, (1999) "Rapid tooling for sand casting using laminated object manufacturing process", Rapid Prototyping Journal, Vol. 5 Issue: 3, pp.134-141, https://doi.org/10.1108/13552549910278964.
[5] “Market Landscape and Competitive Analysis for Metal Casting Manufacturing Industry”. Ipsos Report, 2015.
[6] DeGarmo, EP, et al. Materials and Processes in Manufacturing, 9th Ed. Wiley, 2003.
[7] Kumar, Anil. “Mechanical Arena.” Pattern Materials, Apr. 2011, mechanicalarena.blogspot.com/2011/04/pattern-materials.html.
[8] Two parts molding, http://www.iron-foundry.com/hand-molding-method.html.
[9] David Bak, (2003) "Rapid prototyping or rapid production? 3D printing processes move industry towards the latter", Assembly Automation, Vol. 23 Issue: 4, pp.340-345, https://doi.org/10.1108/01445150310501190.
[10] L. Novakova-Marcincinova and J. Novak-Marcincin, "Testing of the ABS Materials for Application in Fused Deposition Modeling Technology", Applied Mechanics and Materials, Vol. 309, pp. 133-140, 2013.
[11] Heylighen, F., and V. Turchin. The Trial-and-Error Method. Principia Cybernetica, 6 Aug. 1996, pespmc1.vub.ac.be/TRIALERR.html.
[12] Antony, J & Kaye, M., (1999), Experimental quality –A Strategic approach to achieve and improve quality, Norwell, Massachusetts, Kluwer Academic Publishers.
[13] Cesarone, J. (2001). The Power of Taguchi: You've Heard of Design of Experiments and Taguchi Methods; Now Understand When It's Appropriate to Use Each Method. IIE Solutions, 33(11), 36-40.
[14] Sung‐Hoon Ahn, Michael Montero, Dan Odell, Shad Roundy, Paul K. Wright, (2002) "Anisotropic material properties of fused deposition modeling ABS", Rapid Prototyping Journal, Vol. 8 Issue: 4, pp.248-257, https://doi.org/10.1108/13552540210441166.
[15] Karna, S. K., & Sahai, R. (2012). An overview on Taguchi method. International Journal of Engineering and Mathematical Sciences, 1, 1–7.