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Binder influence on green ceramic machining by means of milling and laser machining

Procedia CIRP 2021年 101卷 206-209页

作者： Anthonin Demarbaix François Ducobu Nicolas Preux Fabrice Petit Edouard Rivière-Lorphèvre University of Mons- Faculty of Engineering-Machine Design and Production Engineering Lab Place du Parc 20 - 7000 Mons (Belgium) BCRC–INISMa (member of EMRA) Research and Technological Support Department Av. Gouverneur Cornez 4 - 7000 Mons (Belgium)

The micro manufacturing of ceramic components is technologically challenging especially when complex shapes and micro features are required. A hybrid manufacturing chain is developed for non-sintered(green) blanks machined using sequentially a cutting tool and a laser source. During the preparation of the green blank, a binder is added to the powder to improve compaction. The amount of binder can affect the quality of the machining. The goal of this paper is to study its influence on the material removal rate and the surface quality with both technologies and to determine the optimal proportion for using this hybrid machining.

关键词： Ceramic Miniaturization Laser micro machining Milling

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Influence of Conventional Machining on Chemical Finishing of Ti6Al4V Electron Beam Melting Parts

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Procedia Manufacturing 2020年 47卷 1036-1042页

作者： Laurent Spitaels François Ducobu Anthonin Demarbaix Edouard Rivière-Lorphèvre Pierre Dehombreux Machine Design and Production Engineering Lab - Faculty of Engineering - University of Mons Place du parc 20 7000 Mons Belgium

Additive manufacturing is feeding great hopes for future developments in fields such as aeronautical, biomedical and rapid tooling industrssssies. However, limitations are still restricting its use to make prototypes and hampering mass production. In the case of titanium alloy printing (e.g. Ti6Al4V) with the EBM (Electron Beam Melting) process, the major obstacle to use parts directly after printing is their roughness (Arithmetic Roughness (Ra) ~25 µm). Even if the parts are better regarding residual stresses than parts coming from other 3D printing processes, the high roughness decreases their fatigue resistance. A set of parts were manufactured in Ti6Al4V by EBM process. Their characteristics in terms of dimension (cylindricity and diameter) and surface (Arithmetic Roughness Ra and Total Roughness Rt) were evaluated directly after printing. The average Rt stands at 96 µm e.g. The parts endorsed then a first chemical etching to remove the peaks and valleys on their surface. The average Rt decreased at 90 µm e.g. Afterwards, a robotic machining was performed to remove a layer of 400 µm to reach the core material of the part. The average Rt obtained was 5 µm e.g. Finally, a second chemical etching with the same parameters as the first was done. The average Rt increased finally to 9 µm e.g. The same set of dimensional and surface measurements were made after each step of the experimental setup. The succession of operations and measurements allows to compare the influence of conventional machining on the chemical finishing performed on the parts. Furthermore, the machining emphasizes the apparition of surface defects due to the use of a robot (tessellation). Finally, a Rt degradation and a surface finish change have been recorded after the second chemical etching. Perspectives can be focused on assessing these last observations by repeating the experimental setup with more parts.

关键词： Electron Beam Melting (EBM) Chemical Etching Ti6Al4V Metrology Roughnes

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Experimental analysis of chemical removal effect in RISA grinding of optical glass 7

Experimental analysis of chemical removal effect in RISA gri...

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7th CIRP Conference on Surface Integrity, CSI 2024

作者： Shimodo, Kodai Takamaru, Hinata Chiba, Yusuke Kato, Hidebumi Nagano, Mikinori Fukuta, Masahiko Tanaka, Katsutoshi Watanabe, Kentaro Hamazono, Kazuhisa Kakinuma, Yasuhiro Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Production Headquarters Nikon Corp. 1-10-1 Asamizo-dai Minami-ku Sagamihara252-0328 Japan Nano processing System Division Shibaura Machine C0. Ltd. 2068-3 Ohoka Numazu410-0022 Japan

In the large-aperture lens manufacturing, not only high surface quality but also high productivity is required. From this perspective, Reaction-Induced-Slurry-Assisted grinding (RISA grinding), in which cerium oxide slurry is supplied instead of using general grinding fluid, has been developed to achieve high surface quality at high removal rate. However, the surface profile error becomes large due to chemical removal effect of the cerium oxide slurry. Therefore, the purpose of this study is to experimentally investigate the influence of the chemical removal effect on the surface profile error using AE signals and servo current signals in RISA grinding. First, relation between dwell time and removal depth is analyzed by conducting a basic grinding test without the workpiece rotation. The result shows that the actual removal depth increases with increase of dwell time despite applying the constant depth of cut. Then, zero-cut RISA grinding test is conducted. It is found that the removal process proceeds even though zero-cut grinding, and its removal rate varies according to the wheel feed rate. Furthermore, the amount of cerium oxide abrasives adhered to the grinding wheel can be estimated from the AE signals and servo current signals. © 2024 The Authors. Published by Elsevier B.V.

关键词： Grinding (machining)

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Improving dynamic process stability in finishing of thin-walled workpieces by optimal selection of stock shape

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Procedia CIRP 2024年 126卷 372-377页

作者： Pascal Kienast L. Taner Tunç Recep Koca Ozan Ölgü Philipp Ganser Thomas Bergs Fraunhofer Institute for Production Technology IPT Steinbachstr. 17 52074 Aachen Germany Manufacturing Research Lab Faculty of Engineering and Natural Sciences Sabanci University 34956 Istanbul Türkiye TUSAS Engine Industries Inc. (TEI) 26210 Eskişehir Türkiye Laboratory for Machine Tools and Production Engineering (WZL) RWTH Aachen University Campus-Boulevard 30 52074 Aachen Germany

In 5-axis milling of thin-wall parts, flexibility of the in-process-workpiece (IPW) governs static and dynamic deflections, especially at the semi-finishing and finishing stages. Thus, the near net shape preform, i.e. the stock shape left for semi/finishing is crucial for chatter stability. In this study, a methodology is presented to design the stock shape for improved stability. Coupled process simulation, which includes material removal, finite element analysis (FEA) and process stability simulations, is used to show the effect of stock shape on chatter stability. Spindle speed is optimized along the toolpath based on the varying process dynamic behavior for selected cutter locations (CL). The proposed method is experimentally demonstrated on case studies.

关键词： milling 5-axis process stability chatter vibration, in-process workpiece, machining strategy, coupled process simulation

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The possibility of noticing the cyclists based on reflective effect of the elements on the bicycle pedals

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Periodica Polytechnica Transportation engineering 2021年第2期49卷 132-138页

作者： Tarkowski, Slawomir Nieoczym, Aleksander Caban, Jacek Madleňák, Radovan Department of Motor Vehicles Faculty of Mechanical Engineering Lublin University of Technology Nadbystrzycka 36 Lublin20-618 Poland Department of Machine Design and Mechatronics Faculty of Mechanical Engineering Lublin University of Technology Nadbystrzycka 36 Lublin20-618 Poland Department of Agricultural Forestry and Transport Machines Faculty of Production Engineering University of Life Sciences in Lublin Glęboka 28 Lublin20-612 Poland Department of Communications Faculty of Operation and Economics of Transport and Communications University of Zilina Univerzitná 8215/1 Žilina010 26 Slovakia

The article presents the results of the research describing the changes of bicycle pedal angle relative to the ground, depending on the bicycle crank setting, and the impact of these parameters on detecting the reflective effect emitted by the reflective elements mounted on the bicycle pedals. The results of the road tests determining the cyclist detecting by a car driver, when bicycle is equipped only with bicycle pedals, reflective lights, illuminated with car′s passing lights are also presented. The research described in this article has been carried out for the purpose of reviewing the causes of traffic accidents, occurring at night, in the areas not illuminated by the street lights, in which the cyclists using defective bicycles (according to the regulations) took part. © 2020 Budapest university of Technology and Economics. All rights reserved.

关键词： Accidents

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Influence of the Choice of the Parameters on Constitutive Models and their Effects on the Results of Ti6Al4V Orthogonal Cutting Simulation

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Procedia Manufacturing 2020年 47卷 458-465页

作者： Nithyaraaj Kugalur-Palanisamy Edouard Rivière-Lorphèvre François Ducobu Pedro-José Arrazola University of Mons Faculty of Engineering Machine Design and Production Engineering Lab - Belgium Mondragon University Faculty of Engineering Mechanical and Manufacturing Department - Spain

A pertinent set of parameters is equally important as a constitutive model that describes the material behavior in modeling and finite element simulation of the machining process. The purpose of this study is to show the influence of the parameters on constitutive models by comparing and investigating three constitutive laws. The first is the original Johnson-Cook model, the second is the modified Johnson-Cook model that takes the strain softening behavior into account and the third is the modified Johnson-Cook model that introduces a temperature dependent hardening factor. This paper deals with the modelling and simulation of the orthogonal cutting process with those three constitutive models with different sets of constitutive model parameters and highlights their influence on the results. Forces and chip morphology from the numerical simulations are compared with an experimental orthogonal cutting reference for validation and determination of the best combination.

关键词： Orthogonal Cutting Simulation FEA Constitutive Models Influence of Parameters

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Vibro-acoustics of functionally graded porous beams subjected to thermo-mechanical loads

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Structural engineering and Mechanics 2022年第6期44卷 829-843页

作者： Chinnapandi, Lenin Babu Mailan Pitchaimani, Jeyaraj Eltaher, Mohamed A. ESchool of Mechanical Engineering Vellore Institute of Technology Tamil Nadu Chennai600127 India Electric Vehicles-Incubation Testing and Research Centre Vellore Institute of Technology Tamil Nadu Chennai600127 India Advanced Dynamics Lab Department of Mechanical Engineering National Institute of Technology Karnataka Mangalore Surathkal575 025 India Mechanical Design and Production Dept. Faculty of Engineering Zagazig University P.O. Box 44519 Zagazig Egypt P.O. Box 80204 Jeddah Saudi Arabia

This manuscript work presents a comprehensive continuum model capable to investigate the effect of porosity on vibro-acoustic behaviour of functionally graded (FG) beams resting on an elastic foundation subjected to thermal and mechanical loadings. Effects of uniform temperature rise and edge compressive load on the sound radiation characteristics are studied in a comparative manner. The numerical analysis is carried out by combining finite element method with Rayleigh’s integral. Detailed parametric studies are accomplished, and influences of power law index, porosity volume, porosity distribution and boundary conditions on the vibro-acoustic response characteristics are analyzed. It is found that the vibroacoustic response under mechanical edge compression is entirely different compared to from that under the thermal load. Furthermore, nature of grading of porosity affects the sound radiation behaviour for both the loads. The proposed model can be used to obtain the suppression performance of vibration and noise FG porous beams under thermal and mechanical loads. Copyright © 2022 Techno-Press, Ltd.

关键词： Finite element method

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Parametric Evaluation and Electromagnetic Performance Comparison of Conventional and Double-Stator Wound-Field Flux Switching machines

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IEEE Transactions on Industry Applications 2025年

作者： Idoko, Hillary C. Akuru, Udochukwu B. Popoola, Olawale Ullah, Wasiq Khan, Faisal Masisi, Lesedi Tshwane University of Technology Department of Electrical Engineering Pretoria0183 South Africa University of Nigeria Department of Electrical Engineering Nsukka410001 Nigeria Tshwane University of Technology Pretoria Campus Department of Electrical Engineering 0183 South Africa Kabul Polytechnic University Vice Chancellor of Research and Journals Department of Electrical Engineering Faculty of Electromechanics Kabul1005 Afghanistan COMSATS University Islamabad Abbottabad Campus Electric Machine Design Research Lab Department of Electrical and Computer Engineering Khyber Pakhtunkhwa Abbottabad22060 Pakistan The University of the Witwatersrand School of Electrical and Information Engineering Braamfontein West 2000 South Africa

In this paper, a comprehensive electromagnetic performance comparison of the conventional wound field flux switching machine (WFFSM) and the double stator WFFSM (DSWFFSM) is undertaken for high torque density applications, based on finite element analysis (FEA). The initial design study reveals superior specific density and torque density of the DSWFFSM over WFFSM. Parametric analysis is then used to systematically vary key structural variables to study their influence on average torque, torque ripple, efficiency and power factor, while a multi-objective optimisation based on normalised weighted objectives is used to select the optimal designs upon which a comparative evaluation is performed to reiterate the intrinsic advantages of DSWFFSM in achieving elevated torque performance. The results show that specific torque and torque density of the DSWFFSM finally increased by 43.5% and 30.4% over the WFFSM, respectively. The torque ripple of the DSWFFSM is also finally reduced by 75.9%. To validate the FEA results, an experimental analysis is provided based on a pre-existing DSWFFSM prototype. © 1972-2012 IEEE.

关键词： Multiobjective optimization

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Optimization of a near-zero-emission energy system for the production of desalinated water and cooling using waste energy of fuel cells

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Chemosphere 2023年第1期336卷 139035页

作者： Lu, Jianbo Abed, Azher M. Nag, Kaushik Fayed, Mohamed Deifalla, Ahmed Al-Zahrani, Ahmed Ghamry, Nivin A. Galal, Ahmed M. Guangxi Key Lab of Human-machine Interaction and Intelligent Decision Nanning Normal University Nanning530001 China Air Conditioning and Refrigeration Techniques Engineering Department Al-Mustaqbal University College Babylon51001 Iraq College of Engineering and Technology American University of the Middle East Kuwait Full Professor Future University in Egypt South Teseen New Cairo11835 Egypt ‏Department of Mechanical and Materials Engineering Faculty of Engineering University of Jeddah Jeddah21589 Saudi Arabia Cairo University Fuculty of Computers and Artificial Intelligene Giza Egypt Department of Mechanical Engineering College of Engineering in Wadi Alddawasir Prince Sattam Bin Abdulaziz University Saudi Arabia Production Engineering and Mechanical Design Department Faculty of Engineering Mansoura University P.O 35516 Mansoura Egypt

In the present study, a biomass-based multi-purpose energy system that can generate power, desalinated water, hydrogen, and ammonia is presented. The gasification cycle, gas turbine, Rankine cycle, PEM electrolyzer, ammonia production cycle using the Haber-Bosch process, and MSF water desalination cycle are the primary subsystems of this power plant. On the suggested system, a thorough thermodynamic and thermoeconomic evaluation has been conducted. For the analysis, the system is first modeled and investigated from an energy point of view, after which it is similarly studied from an exergy point of view before the system is subjected to economic analysis (exergoeconomic analysis). The system is evaluated and modeled using artificial intelligence to aid in the system optimization process after energy, exergy, and economic modeling and analysis. The resulting model is then optimized using a genetic algorithm to maximize system efficiency and reduce system expenses. EES software does the first analysis. After that, it sends the data to MATlab program for optimization and to see how operational factors affect thermodynamic performance and overall cost rate. To find the best solution with the maximum energy efficiency and lowest total cost, multi-objective optimization is used. In order to shorten computation time and speed up optimization, the artificial neural network acts as a middleman in the process. In order to identify the energy system's optimal point, the link between the objective function and the choice factors has been examined. The results show that increasing the flow of biomass enhances efficiency, output, and cost while raising the temperature of the gas turbine's input decreases cost while simultaneously boosting efficiency. Additionally, according to the system's optimization results, the power plant's cost and energy efficiency are 37% and 0.3950$/s, respectively, at the ideal point. The cycle's output is estimated at 18900 kW at this stage. © 2023

关键词： Desalination

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Environmental and technical evaluation of additive manufacturing: Enabling process chain perspective by energy value stream mapping 29

Environmental and technical evaluation of additive manufactu...

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29th CIRP Conference on Life Cycle engineering, LCE 2022

作者： Wiese, Mathias Rogall, Christopher Henningsen, Nadja Herrmann, Christoph Thiede, Sebastian Polymer Additive Manufacturing Center AUDI AG Auto-Union-Straße 1 Ingolstadt85045 Germany Department of Sustainable Manufacturing and Life Cycle Engineering Institute of Machine Tools and Production Technology Technische Universität Braunschweig Langer Kamp 19b Braunschweig38106 Germany Bienroder Weg 54 E Braunschweig38108 Germany Manufacturing Systems Faculty of Engineering Technology Department of Design Production and Management University of Twente De Horst 2 Building 20 EnschedeLW 7522 Netherlands

Additive manufacturing (AM) currently evolves from a prototyping process to an alternative manufacturing process for end-use parts, advancing into fabrication of low to medium product volumes. Moreover, increasing awareness of environmental impacts of manufacturing lead to the necessity of holistic evaluation among traditional evaluation criteria in the technical and economic domains. However, existing evaluation approaches seldom consider a complete AM process chain and are lacking a production-oriented notation which enables comparability across technologies and support in identification of improvement potentials on technical and environmental level. To address this gap, this paper highlights the way from structured data acquisition to setup of an energy value stream map (EVSM) for AM process chains in end-use part production, augmenting methods of lean manufacturing by the energy dimension. Consequently, it contributes to a holistic and transparent process chain perspective to assess AM as a manufacturing alternative. The proposed methodology is applied to a case study covering two different process chains, a first based on powder bed fusion via Multi-jet Fusion (MJF) and a second utilizing vat-photopolymerization via Continuous Liquid Interphase Printing (CLIP). While the MJF process chain's energetical hot spot is situated in the printing process itself, the hot spot for CLIP is found in thermal post-processing, exceeding the comparably efficient printing process by magnitudes and ultimately resulting in higher energy intensity per part compared to the MJF process chain. These results highlight the necessity of a holistic evaluation method for complete AM-based process chains and their influence on the product properties. Insights may help engineers, designers and decision makers in pre-selection of suitable manufacturing strategies with a more complete view on AM process chains. © 2022 Elsevier B.V.. All rights reserved.

关键词： 3D printers

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