A Novel Projection based Electro-Stereolithography ( PES ) Process for Composite Printing

Most current additive manufacturing processes can only process one material in one build. Few of them are able to fabricate multiple materials and composites, with limited choices of materials. In this research, we propose a novel Projection based Electro-Stereolithography (PES) process, which is able to fabricate composites with high resolution and fast speed, and a big range of material choices. The proposed novel additive manufacturing process integrates projection-based stereolithography and electrophotography approaches by using a photoconductive film and digital micro-mirror device (DMD). In PES, a photoconductive film is used to collect charged particles in the regions illuminated by light. More specifically, a laser beam is scanning on the film to create a latent image on the film and then a layer of charged particles is attracted to the illuminated area. A liquid bridge system and a stamping system have been developed to transfer particles from the film to liquid resin precisely. Furthermore, a digital mask is used to pattern the light irradiation of the DMD chip to selectively cure the photopolymer liquid resin and particles of that layer. By transferring particles with designed patterns to the resin in a projection based stereolithography system, we will be able to fabricate composites with various materials at microscopic resolutions very quickly. Challenges in this novel manufacturing process, including transferring of particles and curing control, have been discussed and addressed. The corresponding key parameters of the particles collecting, dropping and curing in the PES system have been identified. A proof-of-concept PES testbed has been developed and a couple of tests have been performed to validate the feasibility of the proposed additive manufacturing approach.

[1]  Kaufui Wong,et al.  A Review of Additive Manufacturing , 2012 .

[2]  Chi Zhou,et al.  Development of a Multi-material Mask-Image-Projection-based Stereolithography for the Fabrication of Digital Materials , 2011 .

[3]  Anirban Dutta,et al.  Electrophotographic Layered Manufacturing , 2004 .

[4]  Jae-Won Choi,et al.  Mass production of 3-D microstructures using projection microstereolithography , 2008 .

[5]  Shiqiao Gao,et al.  The Liquid-Bridge with Large Gap in Micro Structural Systems , 2011 .

[6]  Anirban Dutta,et al.  Investigation of an electrophotography based rapid prototyping technology , 2003 .

[7]  A. Amirfazli,et al.  Liquid transfer mechanism between two surfaces and the role of contact angles. , 2014, Soft matter.

[8]  Yayue Pan,et al.  Smooth Surface Fabrication Based on Controlled Meniscus and Cure Depth in Microstereolithography , 2015 .

[9]  C. K. Chua,et al.  Dual Material Rapid Prototyping Techniques for the Development of Biomedical Devices. Part 1: Space Creation , 2001 .

[10]  Yong Chen,et al.  Multitool and Multi-Axis Computer Numerically Controlled Accumulation for Fabricating Conformal Features on Curved Surfaces , 2014 .

[11]  Robert J. Strong,et al.  A review of melt extrusion additive manufacturing processes: I. Process design and modeling , 2014 .

[12]  Liang Hou,et al.  Additive manufacturing and its societal impact: a literature review , 2013 .

[13]  D. I. Wimpenny,et al.  Additive manufacturing by electrophotography: Challenges and successes. , 2010 .

[14]  Haiping Fang,et al.  Modeling the rupture of a capillary liquid bridge between a sphere and plane , 2010 .

[15]  Jean-Pierre Kruth,et al.  Composites by rapid prototyping technology , 2010 .

[16]  Yong Chen,et al.  A Fast Mask Projection Stereolithography Process for Fabricating Digital Models in Minutes , 2012 .

[17]  James E. Fay,et al.  Electrophotographic printing of part and binder powders , 2004 .

[18]  Capillary force actuators: Modeling, dynamics, and equilibria , 2012 .

[19]  Yayue Pan,et al.  An integrated CNC accumulation system for automatic building-around-inserts , 2013 .

[20]  Weixing Zhou,et al.  Stamp collapse in soft lithography. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[21]  John A. Rogers,et al.  Collapse of stamps for soft lithography due to interfacial adhesion , 2005 .

[22]  Paulo Jorge Da Silva bartolo,et al.  Metal filled resin for stereolithography metal part , 2008 .

[23]  Barry Berman,et al.  3D printing: the new industrial revolution , 2012, IEEE Engineering Management Review.

[24]  Nicholas X. Fang,et al.  Projection micro-stereolithography using digital micro-mirror dynamic mask , 2005 .

[25]  Dejun Jing,et al.  Experimental and Numerical Study on the Flow of Fine Powders from Small-Scale Hoppers Applied to SLS Multi-Material Deposition-Part I , 2002 .

[26]  Wei Sun,et al.  Multi‐nozzle deposition for construction of 3D biopolymer tissue scaffolds , 2005 .

[27]  Yayue Pan,et al.  Smooth surface fabrication in mask projection based stereolithography , 2012 .

[28]  Yonggang Huang,et al.  Transfer printing by kinetic control of adhesion to an elastomeric stamp , 2006 .

[29]  Jean Cross,et al.  Electrostatics, Principles, Problems and Applications , 1987 .

[30]  George M. Whitesides,et al.  Mesoscale Self-Assembly: Capillary Bonds and Negative Menisci , 2000 .

[31]  David J. Quesnel,et al.  Particle adhesion and removal in electrophotography , 2003 .

[32]  Joseph J. Beaman,et al.  Discrete Multi-Material Selective Laser Sintering (M 2 SLS): Development for an Application in Complex Sand Casting Core Arrays , 2000 .

[33]  Gabriele Wurm,et al.  Prospective study on cranioplasty with individual carbon fiber reinforced polymer (CFRP) implants produced by means of stereolithography. , 2004, Surgical neurology.

[34]  Chee Kai Chua,et al.  Dual Material Rapid Prototyping Techniques for the Development of Biomedical Devices. Part 2: Secondary Powder Deposition , 2002 .

[35]  K. Kendall,et al.  Surface energy and the contact of elastic solids , 1971, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[36]  B. Bhushan,et al.  Multiscale effects and capillary interactions in functional biomimetic surfaces for energy conversion and green engineering , 2009, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.