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Technical Brief

Additive Manufacturing and Performance of Functional Hydraulic Pump Impellers in Fused Deposition Modeling Technology

[+] Author and Article Information
S. Fernández, M. Jiménez, J. Porras

Department of Mechanical Engineering,
Technical School of Engineering-ICAI,
Comillas University,
Madrid 28015, Spain

L. Romero, M. M. Espinosa, M. Domínguez

Department of Construction and
Manufacturing Engineering,
School of Industrial Engineering,
Universidad Nacional de Educación a Distancia,
Madrid 28040, Spain

Contributed by the Design for Manufacturing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received February 15, 2015; final manuscript received November 12, 2015; published online December 11, 2015. Editor: Shapour Azarm.

J. Mech. Des 138(2), 024501 (Dec 11, 2015) (4 pages) Paper No: MD-15-1128; doi: 10.1115/1.4032089 History: Received February 15, 2015; Revised November 12, 2015

Would it be possible for an additively manufactured impeller of fused deposition modeling (FDM) technology to have a functional behavior and a similar performance to that of the original impeller of a close-coupled centrifugal pump? In this research paper, different tests are conducted to answer this question and to evaluate the manufacturing process of FDM functional parts. Three performance experiments with the same centrifugal pump, using an open test rig, are carried out and compared, first using the original impeller provided by the manufacturer of the pump, second using an FDM replication of the original one without post-treatment, and third using a chemically dimethyl ketone post-treated FDM replication. The results obtained in the tests demonstrate the functional behavior of both additive FDM impellers in comparison with the one fabricated by means of conventional technology (subtractive manufacturing). Additionally, analogous head-flow curves (and also with an improved performance to the one of the original impeller) are obtained. This research paper introduces significant information concerning a low-cost and low-time manufacturing process of additive functional parts. Moreover, new results are presented regarding the performance of chemically post-treated FDM parts working in functional applications. FDM impellers of high complexity and quality, which meet performance criteria, can be achieved.

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Copyright © 2016 by ASME
Topics: Impellers , Pumps
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Figures

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Fig. 2

CAD and STL models, original impeller (Brass P-Cu Zn 40 Pb 2 UNI 5705), untreated and post-treated FDM impellers (mm scale). Stratasys Dimension SST 768. Build platform, X-Y-Z axes definition and built orientation of the impellers.

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Fig. 1

Test rig: pump (1), pressure gauges (2), and valve (3)

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Fig. 3

Effect of the dipping bath in the FDM test specimens of previous investigations of the authors obtained using a scanning electron microscope. Rear shroud (A) and open blades (B top, C side) of the impeller. Ra of the side of the open blade.

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Fig. 4

Head-Flow curves of the three tested impellers. The impeller mounted on the pump after the tests with (a) and without (b) chemical post-treatment.

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