Development of fine instrumentation in machining technique with high speed camera Context: The framework of this post-doctoral topic is the relationship between the machining parameters and the physical-chemical behaviour of the machined surface, and in particular a modeling approach of the cutting operation. Machining modeling is a challenge because of its physical complexity: high elasto-plastic strains, separation of the work material between flank and rake faces, friction at the interfaces, high coupling between all of these phenomena, high strain rates (10^5 à 10^6 s-1), localization in a tiny area around the cutting edge and the tool nose. All of these considerations induce an experimental validation much more complex to develop. This point is the main goal of this scientific project. Currently, the experimental validations performed during the machining process are especially focused on the measurements of tool forces and torques, cutting temperatures by TC embedded in the tool or infrared camera… After the cutting test, an analysis is made of both the chip and the machined surface. The above mentioned validated results are undoubtably useful but are too general. And are not enough precise, in particular from the point of view of the displacement of the work material in situ. Objective of the post-doctoral project: Development of observable measurements to enable the assessment of the work material displacements during the cutting operation (in-situ).Programme of the post-doctoral: The candidate will focus on the measurement of the displacement field, taking into account existing experimentation to obtain new information. Two potential ways: 1. Optical option with two solutions: high speed camera with high magnification coupled with a special option device to assess the displacement on the one hand (interferences technique: Moiré or/and stromboscopy) and the other hand there is the option of the deposition of a grid on the machined surface. 2. Post mortem option to assess local plastic deformations after cutting, at the scale of the machined surface and subsurface (from tenth microns to microns). The post doctoral candidate will work in close collaboration with PhD candidates working on this topic in the lab. Main steps: Carry out research on experimental devices and update recent bibliographies on this topic. The emphasis should be on the non-conventional techniques used to observe the cutting operation. Choice and specifications of the technique to use. This choice will be defended in a written report outlined the advantages and the disadvantages of each technique. Set up of the technique, development of experimental campaigns and analysis of the experimental results. The discussions will use the machining modeling used. The post-doctoral position will take place at LaBoMaP, at Arts et Metiers ParisTech Cluny/Burgundy/France. Taking into account the specificity of the candidate, supervision will be assured by Arts et Metiers ParisTech Cluny and the CEA (Commissariat à l’Energie Atomique): machining and experimental aspects. Arts et Metiers Contacts: Dr. G. Poulachon et Dr. G. Fromentin (Machining Department/LaBoMaP) CEA Contacts: Dr. Stéphanie Breton Contact: FROMENTIN GUILLAUME MACHINING - LABOMAP ARTS ET METIERS PARISTECH RUE PORTE DE PARIS CLUNY, 71250 France Phone: 33 3 85 59 53 30 Fax: 33 3 85 59 53 70 Email: guillaume.fromentinensam.eu
