Multi-objective optimization of binder jet additive manufacturing of Co-Cr-Mo using machine learning


Onler R., Koca A. S. , Kirim B., Söylemez E.

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2021
  • Doi Number: 10.1007/s00170-021-08183-z
  • Title of Journal : INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
  • Keywords: Binder jetting, Artificial neural network, k-nearest neighbors, Genetic algorithm, Co-Cr-Mo alloy, MICROSTRUCTURAL EVOLUTION, NEURAL-NETWORKS, DENTAL ALLOYS, POWDER, GREEN, PARAMETERS, ALGORITHM, DENSITY, DESIGN, PLASMA

Abstract

Binder jet additive manufacturing is a viable method that can be used with a variety of materials, such as metals and ceramics, and offer higher speed and reduced cost for high-volume production compared to powder bed fusion printing. However, the true potential of binder jet additive manufacturing has yet to be realized due to a significant knowledge gap in the material-process-property relationships. This study presents a robust approach to identifying ideal process parameters for binder jetting of Co-Cr-Mo alloy to enable accurate and reproducible manufacturing of defect-free products with high green density. An experimental investigation of the effect of process parameters on output quality was performed using the design of experiments, followed by the analysis of variance. Further characterization between process parameters and process outputs was revealed using machine learning techniques. The relationship between process parameters and density, dimensions and surface quality of green parts was established using artificial neural networks; qualitative features of green parts were classified by employing the weighted k-nearest neighbors algorithm. Furthermore, a genetic algorithm-based multi-objective optimization was employed to determine optimum process parameters, which predicted the part quality with greater than 90% accuracy. Collectively, the proposed optimization method is capable of identifying favorable process conditions for binder jetting of defect-free Co-Cr-Mo parts, with high dimensional accuracy, surface quality, and green density, and can be adapted to determine unique process settings for different material classes.