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20th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2020

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

ISBN: (纸本)9780995775176

The ceramic microcomponents have very interesting mechanical and thermal properties in an extreme environment such as a high temperature, a corrosive environment, etc. Unfortunately, the principal limitation of ceramic material usage is its shaping because of the brittlness of the material. In modern industry, the use of ceramic materials is still limited to particular applications. MACHCERAM is a new manufacturing chain for ceramic shaping developed from powder synthesis to final machining which introduces a hybrid machining by combining the machining with a cutting tool and a laser machining. The Green Ceramic Machining (GCM) is carried out in this dedicated novel sub-hybrid platform. This combination allows to increase the productivity and repeatability, specifically thanks to the reduced laser spot size that allows to machine small features. The goal of this paper is to find the best combination between the tool diameter and laser machining in this manufacturing chain to reduce the machining time. The optimum is determined with the help of a Computer-Aided Manufacturing (CAM) software developed for the milling process by modeling the laser beam as a cutting tool. The machined result of the combination shows a 50 μm offset between both processes. In this stage production, thin walls of 200 μm break because the mechanical properties of the material are low. Surface integrity is also impacted with a different dimensional tolerance between both processes. Copyright © Proceedings of the 20th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Computer aided design

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Binder influence on green ceramic machining by means of milling and laser machining 9

Binder influence on green ceramic machining by means of mill...

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9th CIRP Conference on High Performance Cutting, HPC 2020

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

ISBN: (纸本)9781713835431

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. © 2020 The Authors. Published by Elsevier B.V.

关键词： Cutting tools

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

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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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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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Calibration method of hybrid machining process in the green ceramic combining micro-milling and laser machining 19

Calibration method of hybrid machining process in the green ...

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19th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2019

作者： Demarbaix, Anthonin Rivière-Lorphèvre, Edouard Ducobu, François Dolimont, Adrien Petit, Fabrice Juste, Enrique Univesity of Mons- Faculty of Engineering-Machine Design and Production Engineering Lab Place du Parc 20 Mons7000 Belgium Research and Technological Support Department Av. Gouverneur Cornez 4 Mons7000 Belgium

ISBN: (纸本)9780995775145

The requirements for quality improvement of engineered products are increasingly stringent, and specially when the miniaturization and difficult-to-machine materials are considered. The development of hybrid machining processes (HMPs) answers this problem. Indeed, HMPs are variants of traditional manufacturing processes (TMPs) and non-traditional manufacturing processes (NTMPs). Both are combinations of either one or more specific advanced machining processes. MACHCERAM Platform is composed of a micro-milling process and a laser machining process used one by one (a sequential HMP). In order to couple both processes, their references frames must theoretically be the same, which is not accurate and induces an offset when moving from one process to the other. This machine tool is devolopped to machine advanced ceramics that are very complex due to hardness. Nowadays, many solutions exist to improve the machinability. One of the solutions is the green machining which occurs in a production stage in which the material can also easily be machined. The green machining is usually used in the industry field due to the fact that the environmental impact is lesser in ceramic machining. The aim of this paper is to develop a calibration method of MACHCERAM Platform which is used to machine a green ceramic by means of the non-contact technology due to weakness of the green body. © 2019 European Society for Precision engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Calibration

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Surface drag analysis after Ti-6Al-4V orthogonal cutting using grid distortion 5

Surface drag analysis after Ti-6Al-4V orthogonal cutting usi...

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5th CIRP Conference on Surface Integrity, CSI 2020

作者： Sela, A. Ortiz-De-Zarate, G. Soler, D. Aristimuño, P. Soriano, D. Germain, G. Ducobu, F. Arrazola, P.J. Faculty of Engineering Mondragon Unibertsitatea Arrasate20500 Spain Arts et Métiers ParisTech CER Angers Laboratoire LAMPA 2 Bd du Ronceray Angers Cedex 149035 France Machine Design and Production Engineering Lab Mons7000 Belgium

Surface integrity directly affects the mechanical behavior of the workpiece, which is especially relevant on fatigue behavior. To characterize the quality of the machined surface, aspects such as material damage, roughness or residual stress are considered. Measurement of the material damage of the surface is characterized in some cases as surface drag, depth of the affected machining zone, a phenomenon which takes place due to plastic strain in the surface layer caused by machining stress which could have an influence on residual stress. Surface drag measurement done with optical microscopes has relevant uncertainty. In this paper, a methodology to measure the surface drag with lower uncertainty is proposed. The method consists of measuring the deformation of a grid as a result of the machining process. The grid was created with micromilling. The method was applied to analyze the effect of feed on the surface integrity after orthogonal cutting of Ti-6Al-4V. The depth of the affected layer was measured using a 3D optical measuring device (Alicona Infinite Focus IFG4) and compared with numerical simulations and a good agreement was achieved. In comparison with optical microscope results, it can be concluded that traditional method underestimates surface drag. © 2020 The Author(s).

关键词： Aluminum alloys

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Surface drag analysis after Ti-6Al-4V orthogonal cutting using grid distortion

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Procedia CIRP 2020年 87卷 372-377页

作者： A. Sela G. Ortiz-de-Zarate D. Soler P. Aristimuño D. Soriano G. Germain F. Ducobu P.J. Arrazola Faculty of Engineering Mondragon Unibertsitatea 20500 Arrasate Spain Arts et Métiers ParisTech CER Angers - Laboratoire LAMPA - 2 Bd du Ronceray 49035 Angers Cedex 1 France University of Mons (UMONS) Faculty of Engineering (FPMs) Machine Design and Production Engineering Lab 7000 Mons Belgium

关键词： Surface drag surface integrity orthogonal cutting Ti-6Al-4V

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Evaluation of different flow stress laws coupled with a physical based ductile failure criterion for the modelling of the chip formation process of Ti-6Al-4V under broaching conditions

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Procedia CIRP 2019年 82卷 65-70页

作者： G. Ortiz-de-Zarate A. Sela F. Ducobu M. Saez-de-Buruaga D. Soler T.H.C. Childs P.J. Arrazola Mondragon Uniberstitatea Faculty of Engineering Loramendi 4 Arrasate-Mondragón 20500 Spain University of Mons (UMONS) Faculty of Engineering (FPMs) Machine Design and Production Engineering Lab 7000 Mons Belgium School of Mechanical Engineering University of Leeds Leeds LS29JT UK

During the machining of Ti-6Al-4V the changing deformation mechanisms produce a complex microstructure of segmented chips, which directly influenced tool-wear and process stability. Numerical simulation could give an insight into the physical phenomena involved in chip segmentation, but its accuracy is directly related to the reliability of the input parameters. In this work, therefore, three different flow stress law were evaluated coupled with a physical based ductile failure criterion, which depends on stress triaxiality and temperature. To this end, the flow stress laws were implemented in the finite element software AdvantEdge by programming user-defined subroutines. The resulting FEM models were compared with orthogonal cutting experimental tests (tubular/linear), analyzing different fundamental outputs (machining forces, temperatures in the workpiece and chip morphology). All the FEM models showed good agreement with the experimental results.

关键词： FEM machining Ti-6Al-4V orhtogonal cutting broaching

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Coupled Eulerian-Lagrangian (CEL) simulation for modelling of chip formation in AA2024-T3

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Procedia CIRP 2019年 82卷 142-147页

作者： F. Ducobu E. Rivière-Lorphèvre M. Galindo-Fernandez S. Ayvar-Soberanis P.-J. Arrazola H. Ghadbeigi University of Mons (UMONS) Faculty of Engineering (FPMs) Machine Design and Production Engineering Lab 20 Place du Parc B-7000 Mons Belgium Department of Mechanical Engineering The University of Sheffield Mappin Street Sheffield S1 3JD UK Advanced Manufacturing Research Centre The University of Sheffield Advanced Manufacturing park Catcliffe Rotherham S60 5TZ UK Mondragon University Faculty of Engineering Mechanical and Manufacturing Department Mondragón 20500 Spain

Aluminium alloys are of the most used alloys in the aeronautic industry. Increasing knowledge in machining and prediction of chip formation in these materials is crucially important to design better components with enhanced functional performance. To achieve this, a new finite element modelling strategy is developed to incorporate material damage and softening in the Coupled Eulerian-Lagrangian (CEL) formulation for the machining of AA2024 alloy. The CEL modelling technique is adopted to simulate chip formation at high cutting speeds. An orthogonal cutting setup is used to compare the modelling predictions with experimentally measured cutting forces and chips sections. The proposed model shows a good ability to reproduce the experimental results and to predict the trends induced by variations in the cutting conditions.

关键词： Finite element method (FEM) Machining Aluminium

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