Optimisation d’un procédé d’usinage par microélectroérosion

Rabah Dahmani 1
1 INL - LOCI - INL - Lab-On-Chip et Instrumentation
INL - Institut des Nanotechnologies de Lyon
Abstract : This work aims at studying Micro Electrical Discharge Milling (μEDM milling), which is a non-contact process allowing machining all hard and electrically conductive materials with a cylindrical ultrathin tool. The principle is based on the creation of electrical micro discharges between the tool and an electrically conductive part immersed in a liquid dielectric. By means of a 3D path, the tool machines a complex shape in the part with high aspect ratio details. In this work, we have firstly improved a process for making cylindrical ultrathin micro-tools by electrochemical etching of tungsten rods. Tools with a diameter of 32.6 ± 0.3 μm and a length of 3 mm have been obtained with an automated and reproducible process. Standard deviation has been divided by 2 by comparison with the previous state of the art. Tools with diameter as low as 3 μm have been fabricated with the help of the machine operator Then these micro-tools have been used for machining parts with the μEDM milling process. To do so, a second generation machine has been entirely developed on the basis of previous work. It has been possible to machine stainless steel in deionized water with 3 μm micro-tools without damaging the tools. In other respects, the μEDM milling process has been characterized in terms of machining resolution, material removal rate and tool wear. An innovative generator of discharges allow machining with 1 to 10 nJ / spark with a reduced tool wear by comparison to the state of the art. An innovative process for the on line characterization of discharges with spatial distribution capability has been developed
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Technologies Émergeantes [cs.ET]. Université Claude Bernard - Lyon I, 2015. Français. 〈NNT : 2015LYO10058〉
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Rabah Dahmani. Optimisation d’un procédé d’usinage par microélectroérosion. Technologies Émergeantes [cs.ET]. Université Claude Bernard - Lyon I, 2015. Français. 〈NNT : 2015LYO10058〉. 〈tel-01814060〉

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