Process development for green part printing using binder jetting additive manufacturing

Abstract

Originally developed decades ago, the binder jetting additive manufacturing (BJ-AM) process possesses various advantages compared to other additive manufacturing (AM) technologies such as broad material compatibility and technological expandability. However, the adoption of BJ-AM has been limited by the lack of knowledge with the fundamental understanding of the process principles and characteristics, as well as the relatively few systematic design guideline that are available. In this work, the process design considerations for BJ-AM in green part fabrication were discussed in detail in order to provide a comprehensive perspective of the design for additive manufacturing for the process. Various process factors, including binder saturation, in-process drying, powder spreading, powder feedstock characteristics, binder characteristics and post-process curing, could significantly affect the printing quality of the green parts such as geometrical accuracy and part integrity. For powder feedstock with low flowability, even though process parameters could be optimized to partially offset the printing feasibility issue, the qualities of the green parts will be intrinsically limited due to the existence of large internal voids that are inaccessible to the binder. In addition, during the process development, the balanced combination between the saturation level and in-process drying is of critical importance in the quality control of the green parts.

Keywords

binder jetting / additive manufacturing / green part / process optimization / process development

References

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Acknowledgement

The authors would like to acknowledge the support of Rapid Prototyping Center (RPC) at University of Louisville and the many technical insights and discussions from Dan Brunermer at ExOne LLC. This work was partially supported by National Science Foundation (Grant No. 1450370, subaward No. OGMN131508E4).

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