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Calibration method of hybrid machining process in the green ceramic combining micro-milling and laser machining
2019,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
Contribution to "euspen’s 19th International Conference & Exhibition, Bilbao, ES, June 2019"
Abstract :
"The requirements for quality amelioration 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 ...
The Hybrid Machining of Ceramic: The choice of production stage
30 mai 2017,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
Contribution to "Euspen’s 17th International Conference & Exhibition, Hannover, DE, May 2017".
Abstract : "The demand for micro products has increased gradually since last decades in various areas, requiring the development of micro manufacturing processes. Micro manufacturing is characterized by the size of functional features (smaller than 10 um), a high precision, a good surface finishing and ...
Development of the hybrid sequential machining: laser machining and milling
2016,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
"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 u-machining and the u-milling. The samples are machined with the two processes to compare the dimensional tolerance and the geometrical ...
Experimental investigation on green ceramic machining with nanosecond laser source
03 décembre 2020,
- HE Condorcet
,
- Article scientifique
Article scientifique
Abstract : "Yttrium oxide tetragonal zirconia polycrystals (Y-TZP) is an inert bioceramic used for many bio-implantable applications that request a high accuracy which is difficult to achieve with the current technologies. Laser machining of hard ceramic is difficult because the interaction of the laser beam with the material can lead to microcracks and surface modifications of the microstructure. ...
Behaviour of pre-sintered Y-TZP during machining operations: Determination of recommended cutting parameters
06 février 2018,
- HE Condorcet
,
- Article scientifique
Article scientifique
"In this paper,the NF E 66-520-5 standard, dedicated to the determination ofthe optimal cutting parameters suitable for ductile material, is applied to the pre-sintered ceramic Y-TZP. The objective of the standard is to calculate the specific cutting energy of the forces created between the chosen tool and material during machining operation. Specific cutting energy is the energy required to remove ...
Prediction of local sintering in laser beam machining of green Y-TZP ceramic
20 mai 2020,
- HE Condorcet
,
- Article scientifique
Article scientifique
Abstract : "Laser beam machining of Y-TZP engineering ceramic material is carried out in green stage to increase the material removal rate. The generation of hot spots may cause local sintering of the ceramic material leading to a decrease of the mechanical properties of the final sintered component. This paper presents the implementation of alternative laser beam paths to reduce the hot spots ...
Chemical etching as a finishing process for electron beam melting (EBM) parts
02 juillet 2019,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
"The goal of this research is to analyze the impact of chemical etching on parts produced by electron beam melting. Given that the surface conditions are poor (Ra between 25 to 35 µm), an enhancement of these is asked. Dimensional and surface measurements were realized on conceived parts. Different exposure times were tested. The impact of these times on surface quality was evaluated. To help ...
Influence of Conventional Machining on Chemical Finishing of Ti6Al4V Electron Beam Melting Parts
26 avril 2020,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
"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 ...
Binder influence on green ceramic machining by means of milling and laser machining
06 septembre 2021,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
"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 ...
Dimensional and geometrical performance assessment of two FDM printers using a benchmark artifact
03 juin 2022,
- HE Condorcet
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
"In this article, dimensional and geometrical performances of two Fused Deposition Modelling (FDM) printers with Cartesian architecture (Ultimaker S3 and Intamsys FUNMAT HT) are compared using an original benchmark artifact design. Five parts were printed on each printer in ABS. Five other parts were also produced with the Ultimaker S3 in PLA to show the influence of material choice on the printer’s ...