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Impact of chemical polishing on surface roughness and dimensional quality of electron beam melting process (EBM) parts

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AIP Conference Proceedings 2018年第1期1960卷

作者： Adrien Dolimont Edouard Rivière-Lorphèvre François Ducobu Stéphane Backaert 1Corresponding author : Machine Design and Production Engineering Lab - Faculty of Engineering - University of Mons Place du parc 20 7000 Mons Belgium 2SAFRAN AERO BOOSTERS Route de Liers 121 4041 Herstal (Milmort) Belgium

Additive manufacturing is growing faster and faster. This leads us to study the functionalization of the parts that are produced by these processes. Electron Beam melting (EBM) is one of these technologies. It is a powder based additive manufacturing (AM) method. With this process, it is possible to manufacture high-density metal parts with complex topology. One of the big problems with these technologies is the surface finish. To improve the quality of the surface, some finishing operations are needed. In this study, the focus is set on chemical polishing. The goal is to determine how the chemical etching impacts the dimensional accuracy and the surface roughness of EBM parts. To this end, an experimental campaign was carried out on the most widely used material in EBM, Ti6Al4V. Different exposure times were tested. The impact of these times on surface quality was evaluated. To help predicting the excess thickness to be provided, the dimensional impact of chemical polishing on EBM parts was estimated. 15 parts were measured before and after chemical machining. The improvement of surface quality was also evaluated after each treatment.

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Virtual and rapid prototyping to develop spatial visualization skills of students in engineering 44

Virtual and rapid prototyping to develop spatial visualizati...

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44th Annual Conference of the European Society for engineering Education - engineering Education on Top of the World: Industry-university Cooperation, SEFI 2016

作者： Wattiaux, David Verlinden, Olivier Rivière-Lorphèvre, Edouard Renotte, Christine Faculty of Engineering Pedagogical Support Unit University of Mons - UMONS Place du Parc 20 Mons7000 Belgium Faculty of Engineering Theoretical Mechanics Dynamics and Vibrations Unit University of Mons - UMONS Place du Parc 20 Mons7000 Belgium Faculty of Engineering Machine Design and Production Engineering Unit University of Mons - UMONS Place du Parc 20 Mons7000 Belgium

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Development of the hybrid sequential machining: Laser machining and milling 16

Development of the hybrid sequential machining: Laser machin...

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16th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2016

作者： Demarbaix, Anthonin Rivière-Lorphèvre, Edouard Ducobu, François Filippi, Enrico Petit, Fabrice Preux, Nicolas Univesity of Mons- Faculty of Engineering-Machine Design and Production Engineering Lab Place du Parc 20 Mons7000 Belgium BCRC-INISMa Research and Technological Support Department Av. Gouverneur Cornez 4 Mons7000 Belgium

ISBN: (纸本)9780956679086

The demand of micro products has increased significantly in recent years. The traditional stand- Alone machine tools were optimized to market demands. These processes still remains a big issue in the repeatability, predictability and the productivity of manufacturing. Today, the machine tools are combined to increase the productivity of manufacturing. These hybrid processes are decomposed in three domains: The assisted hybrid, the mixed hybrid and the sequential hybrid. The sequential hybrid is the combination of the minimum of two technologies in the same structure. The different processes must be mastered before the combination. The aims of this paper is to study the advantages and disadvantages of laser micro-machining and the micro-milling. The final goal is to couple these processes in the same structure. The sequential hybrid process is subtractive-subtractive it combines the laser μ-machining and theμ-milling. The samples are machined with the two processes to compare the dimensional tolerance and the geometrical tolerance of fundamental geometries.

关键词： Milling (machining)

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Characterization of electron beam melting process (EBM) : Capability approach

Characterization of electron beam melting process (EBM) : Ca...

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ASPE/euspen 2016 Summer Topical Meeting on Dimensional Accuracy and Surface Finish in Additive Manufacturing

作者： Dolimont, Adrien Michotte, Sebastien Riviére-Lorphéver, Edouard Ducobu, François De Formanoir, Charlotte Godet, Stephane Filippi, Enrico Machine Design and Production Engineering Lab Faculty of Engineering University of Mons Place du parc 20 Mons7000 Belgium SIRRIS Collective Centre for and by the Technological Industry 26 Rue Auguste Piccard Gosselies6041 Belgium 4Materials Engineering Characterization Synthesis and Recycling Lab Faculty of Engineering-Universit e Libre de Bruxelles Bruxelles1040 Belgium

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2D simulations of orthogonal cutting of CFRP: Effect of tool angles on parameters of cut and chip morphology

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AIP Conference Proceedings 2018年第1期1960卷

作者： Mehdi Benhassine Edouard Rivière-Lorphèvre Pedro-Jose Arrazola Pierre Gobin David Dumas Vinay Madhavan Ohian Aizpuru François Ducobu 1Machine Design and Production Engineering Lab Faculty of Engineering University of Mons (UMONS). Place du Parc 20 7000 Mons BELGIUM 2Mechanical and Manufacturing Department Faculty of Engineering Mondragon University. 20500 Mondragon SPAIN 3Sobelcomp SPRL. Rue de l’économie 13 4431 Loncin BELGIUM 4Cenaero Headquarters. Rue des Frères Wright 29 6041 Gosselies BELGIUM 5Zubiola. Poligono Basterretxe 20720 Azkoitia (Gipuzkoa) SPAIN

Carbon-fiber reinforced composites (CFRP) are attractive materials for lightweight designs in applications needing good mechanical properties. Machining of such materials can be harder than metals due to their anisotropic behavior. In addition, the combination of the fibers and resin mechanical properties must also include the fiber orientation. In the case of orthogonal cutting, the tool inclination, rake angle or cutting angle usually influence the cutting process but such a detailed investigation is currently lacking in a 2D configuration. To address this issue, a model has been developed with Abaqus Explicit including Hashin damage. This model has been validated with experimental results from the literature. The effects of the tool parameters (rake angle, clearance angle) on the tool cutting forces, CFRP chip morphology and surface damage are herewith studied. It is shown that 90° orientation for the CFRP increases the surface damage. The rake angle has a minimal effect on the cutting forces but modifies the chip formation times. The feed forces are increased with increasing rake angle.

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Uncertainty management of cutting forces parameters and its effects on machining stability 18th

Uncertainty management of cutting forces parameters and its ...

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18th International ESAFORM Conference on Material Forming, ESAFORM 2015

作者： Lorphèvre, Edouard Rivière Letot, Christophe Ducobu, François Filippi, Enrico University of Mons Faculty of Engineering Machine Design and Production Engineering Department Place du parc 20 Mons Belgium

ISBN: (纸本)9783038354710

Virtual manufacturing is a field of research which numerically simulate all the manufacturing processes seen by a mechanical part during its production (for example casting, forging, machining, heat treatment,). Its use is rising on various industries to reduce production costs and improve quality of manufactured parts. One of the most challenging component of the whole simulation chain is the simulation of machining operations due to some of its specificities (need of material law at high strain, strain rates and temperature, heterogeneities of machined material, influence of residual stresses,). In order to circumvent these difficulties, macroscopic models of machining process have been developed in order to compute more global information (cutting forces, stability of the process, tolerance or roughness for example). For this approach, the cutting forces computation is done by using simple analytical law based on mechanistic approach. The parameters of the models have no clear physical meaning (or at least cannot be linked to intrinsic properties of the material to be machined) and are therefore considered constants for a given set of simulations. The aim of this paper is to take into account the uncertainty on the variability of the cutting force signal during machining operation used as input for mechanistic model identification. The variability of the response during a test on fixed conditions (cutting tool, machined material and cutting parameters) is taken into account to develop a model where parameters of the model can evolve during a given operation. The proposed model is then used as an input of a milling operation simulation in order to study its influence on machining stability as compared to a classical approach. © (2015) Trans Tech Publications, Switzerland.

关键词： Cutting tools

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Comparison of several behaviour laws intended to produce a realistic Ti6Al4V chip by finite elements modelling 18th

Comparison of several behaviour laws intended to produce a r...

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18th International ESAFORM Conference on Material Forming, ESAFORM 2015

作者： Ducobu, François Arrazola, Pedro-José Rivière-Lorphèvre, Edouard Filippi, Enrico University of Mons Faculty of Engineering Machine Design and Production Engineering Department Belgium Mondragon University Faculty of Engineering Mechanical and Manufacturing Department Spain

ISBN: (纸本)9783038354710

The final aim of finite elements modelling is to help in the choice of the cutting parameters and in the comprehension of the involved phenomena. Representing correctly the behaviour of the machined material is hard due to the extreme conditions encountered, although this is a key parameter to develop a realistic model. Four laws are used in this paper to represent the Ti6Al4V. They are all based on the Johnson-Cook law. This study shows that the influence of the behaviour law is high on the chip morphology and on the forces and that the strain softening phenomenon should be taken into account. For the cutting conditions adopted, it is however necessary to add damage properties in the chip to obtain a morphology and a cutting force evolution close to the experimental reference. © (2015) Trans Tech Publications, Switzerland.

关键词： Aluminum alloys

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A data driven degradation-based model for the maintenance of turnouts: a case study

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IFAC-PapersOnLine 2015年第21期48卷 958-963页

作者： Letot, C. Dersin, P. Pugnaloni, M. Dehombreux, P. Fleurquin, G. Douziech, C. La-Cascia, P. University of Mons Faculty of Engineering Department of Machine Design and Production Engineering 20 Place du Parc Mons 7000 Belgium ALSTOM Transport sa 48 Rue Albert Dhalenne 93482 France ALSTOM Ferroviaria Spa 75 Via Di Corticella Bologna Italy

The goal of this paper is to share experience about the degradation assessment of railway track point machines. A real scale point machine test bench was used to perform several thousands of maneuvers. Recorded data consisted in the measurements of the shaft speed and the torque during a maneuver. Some faulty conditions were introduced to obtain degraded signals. Relevant indicators were computed to quantify the health state of the point machine and to detect faulty behaviours. The analysis also highlighted the influence of the temperature on the point machine performance. A degradation model is then built from the indicator to compute the reliability and the remaining useful life. The conclusions of this analysis will be useful to properly define an experimental design to be applied on a real turnout. © 2015

关键词： Fault detection

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Stability of Drugs Used in Helicopter Air Medical Emergency Services: An Exploratory Study

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Air Medical Journal 2016年第4期35卷 247-250页

作者： De Winter, Sabrina Bronselaer, Koen Vanbrabant, Peter Blanchaert, Bart Mansour, Marwa F. Brandolisio, Daniele De Jonge, Stijn Slaets, Peter Sas, Paul Van Schepdael, Ann Spriet, Isabel Department of Pharmaceutical and Pharmacological Sciences KU Leuven University of Leuven University Hospitals Leuven Leuven Belgium Department of Emergency Medicine KU Leuven University of Leuven University Hospitals Leuven Leuven Belgium Department of General Internal Medicine KU Leuven University of Leuven University Hospitals Leuven Leuven Belgium Department of Pharmaceutical and Pharmacological Sciences Pharmaceutical Analysis KU Leuven University of Leuven Leuven Belgium Department of Mechanical Engineering Production Engineering Machine Design and Automation (PMA) Section KU Leuven University of Leuven Leuven Belgium Faculty of Engineering Technology KU Leuven GROEP T Leuven Belgium

Objective Transportation by air exposes drugs used in emergency medical services to vibrations. The aim of the study was to determine whether or not vibrations caused by a helicopter induce the degradation of 5 drugs used in this setting. Methods A longitudinal study in an operating medical helicopter along with a worst case was conducted. The studied drugs were 3 drugs labeled for refrigeration (cisatracurium, lorazepam, and succinylcholine) and 2 albumin solutions (human albumin 4% and 20%). These drugs were stored for 4 months according to the following conditions: inside a helicopter, worst case with exposure to extreme vibrations, at room temperature, and according to manufacturers’ recommendations. Samples were analyzed with validated high-performance liquid chromatography assay methods. A drug was considered stable if the remaining drug content was above 90% of the label claim. Except for the albumin solutions, visual inspection was used to determine instability by the formation of aggregates. Results Only the samples stored at room temperature became unstable after 4 months. No difference in extreme foaming was observed in the albumin solutions. Conclusions These data suggest that the effect of degradation of drugs caused by vibrations is negligible. Temperature was observed as the main cause of drug degradation. © 2016

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Influence on surface characteristics of electron beam melting process (EBM) by varying the process parameters

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AIP Conference Proceedings 2017年第1期1896卷

作者： Adrien Dolimont Sebastien Michotte Edouard Rivière-Lorphèvre François Ducobu Solange Vivès Stéphane Godet Tom Henkes Enrico Filippi 1Machine Design and Production Engineering Lab - Faculty of Engineering - University of Mons Place du parc 20 7000 Mons Belgium 2SIRRIS collective centre for and by the technological industry 26 Rue Auguste Piccard 6041 Gosselies Belgium 34MAT Université Libre de bruxelles 50 av. F.D. Roosevelt (CP 165/63) 1050 Bruxelles Belgium 4SAFRAN AERO BOOSTERS Route de Liers 121 4041 Herstal (Milmort) Belgium

The use of additive manufacturing processes keeps growing in aerospace and biomedical industry. Among the numerous existing technologies, the Electron Beam Melting process has advantages (good dimensional accuracy, fully dense parts) and disadvantages (powder handling, support structure, high surface roughness). Analyzes of the surface characteristics are interesting to get a better understanding of the EBM operations. But that kind of analyzes is not often found in the literature. The main goal of this study is to determine if it is possible to improve the surface roughness by modifying some parameters of the process (scan speed function, number of contours, order of contours, etc.) on samples with different thicknesses. The experimental work on the surface roughness leads to a statistical analysis of 586 measures of EBM simple geometry parts.

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