3D Printing Technologies II

A special issue of Technologies (ISSN 2227-7080). This special issue belongs to the section "Manufacturing Technology".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 7359

Special Issue Editor

Dipartimento di Chimica, Materiali e Ingegneria Chimica Giulio Natta, Politecnico di Milano, Via Mancinelli 7, 20131 Milan, Italy
Interests: microfabrication; electrochemistry; surface treatments
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Three-dimensional printing is rapidly revolutionizing the way industrial production has always been intended. Its potential to produce intricate parts starting from a computer-aided design makes it one of the main pillars for industry 4.0. Furthermore, additive manufacturing finds application in virtually all production fields. As a natural consequence of these considerations, research is primarily focused on the development of novel materials and techniques for 3D printing.

In this context, the notable scientific interest raised by the first volume of the Special Issue “3D Printing Technologies” constitutes an important evidence of the growing industrial importance of additive manufacturing. This second volume, in analogy with its predecessor, is intended to report cutting edge advances in this promising technology. It is open to both original research articles able to advance knowledge on 3D printing and to reviews meant to take stock of state-of-the-art literature.

Possible topics include: 3D printing of soft and biomaterials, additive manufacturing for electronics and metamaterials, new materials for 3D printing (metals, composites, hard materials, ceramics, etc.), multi-material 3D printing, integration of 2D (inkjet printing, screen printing, etc.) and 3D printing technologies, metallization for 3D printing, 3D printing for microfabrication, numerical and finite elements modelling of additive manufacturing processes.

Dr. Roberto Bernasconi
Guest Editor

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Keywords

  • 3D printing
  • additive manufacturing
  • industry 4.0
  • process development
  • process integration
  • numerical modelling

Published Papers (3 papers)

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Research

17 pages, 6623 KiB  
Article
Cost-Effective 3D Printing of Silicone Structures Using an Advanced Intra-Layer Curing Approach
by Cormac D. Fay and Liang Wu
Technologies 2023, 11(6), 179; https://0-doi-org.brum.beds.ac.uk/10.3390/technologies11060179 - 12 Dec 2023
Cited by 2 | Viewed by 2194
Abstract
We present an advanced, low-cost 3D printing system capable of fabricating intricate silicone structures using commercially available off-the-shelf materials. Our system used a custom-designed, motorised syringe pump with a driving lead screw and excellent control of material extrusion to accommodate the high viscosity [...] Read more.
We present an advanced, low-cost 3D printing system capable of fabricating intricate silicone structures using commercially available off-the-shelf materials. Our system used a custom-designed, motorised syringe pump with a driving lead screw and excellent control of material extrusion to accommodate the high viscosity of silicone printing ink, which is composed of polydimethylsiloxane (PDMS), diluent, and a photo-initiator (LAP). We modified an open-source desktop 3D printer to mount the syringe pump and programmed it to deposit controlled intricate patterns in a layer-by-layer fashion. To ensure the structural integrity of the printed objects, we introduced an intra-layer curing approach that fused the deposited layers using a custom-built UV curing system. Our experiments demonstrated the successful fabrication of silicone structures at different infill percentages, with excellent resolution and mechanical properties. Our low-cost solution (costing less than USD 1000 and requiring no specialised facilities or equipment) shows great promise for practical applications in areas such as micro-fluidics, prosthesis, and biomedical engineering based on our initial findings of 300 μm width channels (with excellent scope for smaller channels where desirable) and tunable structural properties. Our work represents a significant advance in low-cost desktop 3D printing capabilities, and we anticipate that it could have a broad impact on the field by providing these capabilities to scholars without the means to purchase expensive fabrication systems. Full article
(This article belongs to the Special Issue 3D Printing Technologies II)
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14 pages, 3108 KiB  
Article
Combined Treatment of Parts Produced by Additive Manufacturing Methods for Improving the Surface Quality
by Sergey Grigoriev, Alexander Metel, Marina Volosova, Yury Melnik and Enver Mustafaev
Technologies 2022, 10(6), 130; https://0-doi-org.brum.beds.ac.uk/10.3390/technologies10060130 - 11 Dec 2022
Viewed by 1661
Abstract
To improve the quality of a part manufactured by the additive method, it is necessary to eliminate the porosity and high roughness of its surface, as well as to deposit a coating on it. For this purpose, in the present work, we studied [...] Read more.
To improve the quality of a part manufactured by the additive method, it is necessary to eliminate the porosity and high roughness of its surface, as well as to deposit a coating on it. For this purpose, in the present work, we studied the combined processing in a gas discharge plasma of complex shape parts obtained by the additive manufacturing method, which includes explosive ablation of surface protrusions when voltage pulses are applied to the part immersed in the plasma; polishing with a concentrated beam of fast neutral argon atoms at a large angle of incidence on the surface of the part, and magnetron deposition of a coating on it with assistance by fast argon atoms. Combined processing made it possible to completely get rid of porosity and reduce the surface roughness from Ra ~ 5 µm to Ra ~ 0.05 µm. Full article
(This article belongs to the Special Issue 3D Printing Technologies II)
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24 pages, 11090 KiB  
Article
Influence of Postprocessing on Wear Resistance of Aerospace Steel Parts Produced by Laser Powder Bed Fusion
by Alexander S. Metel, Sergey N. Grigoriev, Tatiana V. Tarasova, Anastasia A. Filatova, Sergey K. Sundukov, Marina A. Volosova, Anna A. Okunkova, Yury A. Melnik and Pavel A. Podrabinnik
Technologies 2020, 8(4), 73; https://0-doi-org.brum.beds.ac.uk/10.3390/technologies8040073 - 02 Dec 2020
Cited by 11 | Viewed by 2744
Abstract
The paper is devoted to the research of the effect of ultrasonic postprocessing—specifically, the effects of ultrasonic cavitation-abrasive finishing, ultrasonic plastic deformation, and vibration tumbling on surface quality, wear resistance, and the ability of real aircraft parts with complex geometries and with sizes [...] Read more.
The paper is devoted to the research of the effect of ultrasonic postprocessing—specifically, the effects of ultrasonic cavitation-abrasive finishing, ultrasonic plastic deformation, and vibration tumbling on surface quality, wear resistance, and the ability of real aircraft parts with complex geometries and with sizes less than and more than 100 mm to work in exploitation conditions. The parts were produced by laser powder bed fusion from two types of anticorrosion steels of austenitic and martensitic grades—20Kh13 (DIN 1.4021, X20Cr13, AISI 420) and 12Kh18N9T (DIN 1.4541, X10CrNiTi18-10, AISI 321). The finishing technologies based on mechanical action—plastic deformation, abrasive wear, and complex mechanolysis showed an effect on reducing the submicron surface roughness, removing the trapped powder granules from the manufactured functional surfaces and their wear resistance. The tests were completed by proving resistance of the produced parts to exploitation conditions—vibration fatigue and corrosion in salt fog. The roughness arithmetic mean deviation Ra was improved by 50–52% after cavitation-abrasive finishing, by 28–30% after ultrasonic plastic deformation, and by 65–70% after vibratory tumbling. The effect on wear resistance is correlated with the improved roughness. The effect of used techniques on resistance to abrasive wear was explained and grounded. Full article
(This article belongs to the Special Issue 3D Printing Technologies II)
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