Implant-Prosthodontic Discrepancy of Complete-Arch Cobalt-Chromium Implant Frameworks Manufactured Through Selective Laser Melting Additive Manufacturing Technology Using a Coordinate Measuring Machine

2019 ◽  
Vol 34 (3) ◽  
pp. 698-707 ◽  
Author(s):  
Marta Revilla-León ◽  
Laura Ceballos ◽  
Mutlu Özcan
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Coordinate Measuring Machine ◽  
Manufacturing Technology ◽  
Cobalt Chromium ◽  
Laser Melting ◽  
Additive Manufacturing Technology ◽  
Measuring Machine

Fabrication of flapping-wing micromechanism assembly using selective laser melting and aerodynamic performance measures

2021 ◽  
pp. 146442072110354
Author(s):  
Surendar Ganesan ◽  
Balasubramanian Esakki ◽  
Lung-Jieh Yang ◽  
D Rajamani ◽  
M Silambarsan ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Electrical Discharge Machining ◽  
Weight Ratio ◽  
High Strength ◽  
Flapping Wing ◽  
Manufacturing Technology ◽  
Al Alloy ◽  
Laser Melting ◽  
Additive Manufacturing Technology

The development of a flapping wing microaerial vehicle mechanism with a high strength-to-weight ratio to withstand high flapping frequency is of significant interest in aerospace applications. The traditional manufacturing methods such as injection moulding and wire-cut electrical discharge machining suffer from high cost, labour intensiveness, and time-to-market. However, the present disruptive additive manufacturing technology is considered a viable replacement for manufacturing micromechanism components. Significantly to withstand high cyclic loads, metal-based high strength-to-weight ratio flapping wing microaerial vehicle components are the need of the hour. Hence, the present work focused on the fabrication of flapping wing microaerial vehicle micromechanism components using selective laser melting with AlSi10Mg alloy. The manufactured micromechanism components attained 99% of dimensional accuracy, and the total weight of the Evans mechanism assembly is 4 g. The scanning electron microscopy analysis revealed the laser melting surface characteristics of the Al alloy. The assembled mechanism is tested in static and dynamic environments to ensure structural rigidity. Aerodynamic forces are measured using a wind tunnel setup, and 7.5 lift and 1.2 N thrust forces are experienced that will be sufficient enough to carry a payload of 1 g camera on-board for surveillance missions. The study suggested that the metal additive manufacturing technology is a prominent solution to realize the micromechanism components effortlessly compared to conventional subtractive manufacturing.

scholarly journals Uncertainty assessment for measurement and simulation in selective laser melting: a case study of an aerospace part

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 96
Author(s):  
Giulio D'Emilia ◽  
Antoniomaria Di Ilio ◽  
Antonella Gaspari ◽  
Emanuela Natale ◽  
Antonios G. Stamopoulos
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Manufacturing Process ◽  
Thermal Stresses ◽  
Hybrid Approach ◽  
Coordinate Measuring Machine ◽  
Thermal Treatments ◽  
Laser Melting ◽  
Measuring Machine ◽  
Simulation Results

<p class="Abstract"><span lang="EN-US">In this work, the additive manufacturing process selective laser melting is analysed with the aim of realising a complex piece for aerospace applications. In particular, the effect of the manufacturing process and of the following thermal treatments on the dimensions of the workpiece is evaluated. The study is based on a hybrid approach including a simulation of the whole manufacturing process by advanced software packages and the dimensional measurements of the realised pieces taken by a coordinate measuring machine (CMM). The integrated use of simulation and measurements is carried out with the aim of validating the simulation results and of identifying the operational limits of both approaches; this analysis is based on metrological evaluation of the results of both the simulation and the tests, taking into account the uncertainty of the data. In addition, the main causes of uncertainty for the simulation activity and the experimental data have been identified, and the effects of some of them have also been experimentally evaluated. Based on the experimental validation, the simulation seems to predict the absolute displacement of the supports of the piece in a satisfactory way, while it is unable, in the actual configuration, to assess the conformity of the surface to its very tight shape tolerances. Conformity assessment of the surface should be carried out by CMM measurement. Integrated use of simulation and experimental results is expected to strongly improve the accuracy of simulation results for the effective and accurate design and control of the additive manufacturing process, including dimensional control and thermal treatments to mitigate induced thermal stresses.</span></p>

Qualität steigern mit Selective Laser Melting/Quality improvement with selective laser melting – An approach to manage requirements with additive manufacturing

2015 ◽  
Vol 105 (11-12) ◽  
pp. 793-797
Author(s):  
J. C. Aurich ◽  
M. Burkhart
Keyword(s):  
Quality Improvement ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
High Accuracy ◽  
Manufacturing Technology ◽  
Laser Melting ◽  
Additive Manufacturing Technology ◽  
Manufacturing Technologies ◽  
Design Freedom

Additive Manufacturing (AM) ist der Überbegriff für unterschiedliche Fertigungsverfahren, welche durch das schichtweise Aufbringen von Werkstoff die Herstellung von Bauteilen ermöglichen. Selective Laser Melting (SLM) ist ein additives Fertigungsverfahren zur Herstellung von Produkten mit hoher Detailgenauigkeit und Designfreiheit. Der Fachbeitrag stellt ein Konzept vor, bei dem durch systematisches Vorgehen untersucht wird, ob Produktanforderungen mit SLM besser erfüllt werden können als mit konventionellen Fertigungsverfahren. &nbsp; Additive Manufacturing (AM) is the term for various manufacturing technologies that enable manufacturing of components by adding layer after layer of material. Selective Laser Melting (SLM) is an additive manufacturing technology that allows to manufacture products with high accuracy and design freedom. In this article an approach is presented to systematically examine, if product requirements can be fulfilled better with SLM than with conventional manufacturing technologies.

Analysis of post-processing influence on the geometrical and dimensional accuracy of selective laser melting parts

2020 ◽  
Vol 26 (10) ◽  
pp. 1713-1722
Author(s):  
Eduardo Cuesta ◽  
Braulio J. Alvarez ◽  
Pablo Zapico ◽  
Sara Giganto
Keyword(s):  
Heat Treatment ◽  
Selective Laser Melting ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Point Of View ◽  
Laser Melting ◽  
Sand Blasting ◽  
Content Type ◽  
Stress Relieving ◽  
Measuring Machine

Purpose This study aims to analyze the effect of the different common post-processes on the geometrical and dimensional accuracy of selective laser melting (SLM) parts. Design/methodology/approach An artefact has been designed including cubic features formed by planar surfaces orientated according to the machine axes, covering all the X-Y area of the working space. The artefact has been analyzed both geometrically (flatness, parallelism) and dimensionally (sizes, distances) from coordinate measuring machine measurement results at three stages, namely, as-built, after sand-blasting and after stress-relieving heat treatment. Findings Results from the SLM machine used in this study lead to smaller parts than the nominal ones. This effect depends on the direction of the evaluated dimension of the parts, i.e. X, Y or Z direction and is differently affected by the sandblasting post-process (average erosion ratio of 68, 54 and 9 µm, respectively), being practically unaltered by the HT applied after. Originality/value This paper shows the influence, from a geometric and dimensional point of view, of two of the most common post-processes used after producing SLM parts, such as sand-blasting and stress-relieving heat treatment, that have not been considered in previous research.

scholarly journals An Experimental Study on Micro-Milling of a Medical Grade Co-Cr-Mo Alloy Produced by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2208 ◽  
Author(s):  
Gabriele Allegri ◽  
Alessandro Colpani ◽  
Paola Serena Ginestra ◽  
Aldo Attanasio
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Chip Thickness ◽  
Material Behavior ◽  
Micro Milling ◽  
Cobalt Chromium ◽  
Laser Melting ◽  
Chip Formation Mechanism ◽  
Manufacturing Techniques ◽  
Cobalt Chromium Molybdenum

Cobalt-chromium-molybdenum (Co-Cr-Mo) alloys are very promising materials, in particular, in the biomedical field where their unique properties of biocompatibility and wear resistance can be exploited for surgery applications, prostheses, and many other medical devices. While Additive Manufacturing is a key technology in this field, micro-milling can be used for the creation of micro-scale details on the printed parts, not obtainable with Additive Manufacturing techniques. In particular, there is a lack of scientific research in the field of the fundamental material removal mechanisms involving micro-milling of Co-Cr-Mo alloys. Therefore, this paper presents a micro-milling characterization of Co-Cr-Mo samples produced by Additive Manufacturing with the Selective Laser Melting (SLM) technique. In particular, microchannels with different depths were made in order to evaluate the material behavior, including the chip formation mechanism, in micro-milling. In addition, the resulting surface roughness (Ra and Sa) and hardness were analyzed. Finally, the cutting forces were acquired and analyzed in order to ascertain the minimum uncut chip thickness for the material. The results of the characterization studies can be used as a basis for the identification of a machining window for micro-milling of biomedical grade cobalt-chromium-molybdenum (Co-Cr-Mo) alloys.

Technical Problems and Perspectives of Implementing the Selective Laser Melting Method for Producing Structural Components for Aircraft

2015 ◽  
Vol 834 ◽  
pp. 29-33 ◽  
Author(s):  
Tatiana Vasilievna Tarasova ◽  
Anastasia Aleksandrovna Filatova ◽  
Evgenia Yurievna Dolzhikova
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Structural Components ◽  
Laser Melting ◽  
Technical Problems ◽  
Melting Method ◽  
Additive Manufacturing Technology ◽  
Literary Sources ◽  
Aircraft Production ◽  
Technology Processes

The article touches upon the technical problems and perspectives of implementing the Selective Laser Melting method for producing structural components for aircraft. The possibilities of additive manufacturing technology processes and their advantages in comparison with traditional methods of part formation are shown. Issues of standardization in the field of additive manufacturing, as well as terms and definitions adopted at the present time, are considered. Based on the analysis of literary sources, the necessity of developing selective laser melting methods for the specific steels and alloys used in aircraft production is shown.

scholarly journals A novel workflow for indirect cobalt-chromium restorations using additive manufacturing without digital design

2021 ◽  
Vol 15 (3) ◽  
pp. 147-151
Author(s):  
Les Kalman ◽  
Lyndsay Desimone
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Surface Finish ◽  
Preliminary Investigation ◽  
Digital Design ◽  
Conventional Approach ◽  
Cobalt Chromium ◽  
Intraoral Scanner ◽  
Laser Melting

This preliminary investigation explored additive manufacturing to fabricate cobalt-chromium onlay restorations without the use of digital design. Extracted molars were prepared for four-surface onlays followed by the conventional approach for the fabrication of provisionals. The provisionals were digitized with an intraoral scanner, and stereolithography (STL) files were fabricated with additive manufacturing in cobalt-chromium, utilizing selective laser melting (SLM). Onlays were bonded to the corresponding tooth. Restorations were polished after cementation and assessed with photography, radiography, and a clinical post-cementation checklist. Cementation was unremarkable; marginal adaption and surface finish were generally acceptable. A simple, efficient, and inexpensive alternative workflow for the fabrication of indirect restorations without using the digital design is proposed.

scholarly journals REVIEW OF MANUFACTURING AND REPAIR OF AIRCRAFT AND ENGINE PARTS BASED ON COLD SPRAYING TECHNOLOGY AND ADDITIVE MANUFACTURING TECHNOLOGY

2020 ◽  
pp. 53-70
Author(s):  
Kun Tan ◽  
Sergii Markovych ◽  
Wenjie Hu ◽  
Oleksandr Shorinov ◽  
Yurong Wang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Cold Spray ◽  
Critical Speed ◽  
Cold Spraying ◽  
Laser Melting ◽  
Melting Technology ◽  
Additive Manufacturing Technology

Cold spray technology is a method of deposited metal coatings by high-speed particle impact, especially in the preparation of metal alloy materials (Cu alloys, Ti alloys, Al alloys, Ni-based alloys, Mg alloys, stainless steels, and high-temperature alloys, etc.) The performance is particularly outstanding. The sprayed materials have better mechanical properties, mechanical properties, and service life, such as tensile strength, fatigue strength, and corrosion resistance. Cold spray technology can prepare corrosion-resistant coatings and high-temperature coatings, Wear-resistant coatings, conductive coatings, and anti-oxidation coatings and other functional coatings. From the perspective of process technology and equipment design, cold spray technology can be applied to the field of additive manufacturing technology, which not only reflects the repair function but also the manufacturing function, and applies cold spray technology and repairs the parts produced by additive manufacturing – Selective Laser Melting technology. The defects and problems are of great significance. This article summarizes the repair process and technical characteristics of cold spray technology, and repairs and protects the Cu, Ti, Al, Ni, Mg, and stainless steel and other metals and their alloys from corrosion, fatigue, and wear. The maintenance is reviewed, and the application of combining cold spray technology with additive manufacturing – Selective Laser Melting technology is proposed. Many materials can be used in the field of cold spray technology and Additive Manufacturing – Selective Laser Melting technology. In the communication between the two, the combination of technology and method is of great significance; the influence of spraying parameters of cold spraying technology (such as powder particle shape, spraying angle, spraying distance, critical speed and temperature of particles and substrate, etc.) on spraying effect and efficiency are proposed. Finally, the development of cold spray technology: post-processing of parts, critical speed and numerical simulation are possible.

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