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BSc HES-SO en Microtechniques - Haute école du paysage, d'ingénierie et d'architecture de Genève
Richard Jacques, Giandomenico Nicola
Procedia CIRP, 2018, 68, pp. 819-824
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EDM-milling and micro-EDM-milling aims to machine deep cavities with rotating electrode; those technologies have a great potential, nevertheless the electrode's wear has to be compensated, which is a big challenge. To achieve this, the electrode profile is of crucial importance as it has a direct impact on the part removed material, but in the same time, the wear modifies this profile. This paper will investigate how the electrode profile is related to tool-path trajectory. It will demonstrate the link between wear, trajectory and electrode profile – both from theoretical point of view and by experimental verification. In case of cylindrical shape electrode with a trajectory in full material, the electrode profile is conically self-shaped. With a zigzag pocketing trajectory the self-shaped profile is more complex but linked with the tool-path overlap in a predictable way: it depends upon the volumetric wear, upon the tool-path overlap, tool-path steepness and the EDM gap. In identical conditions, the EDM gap has for effect to more make the electrode's profile more flat. For the micro-EDM-milling (electrode diameter < 0.3 mm); this fact is even more pronounced and lead to the fact that the electrode profile tends to be cylindrical. This makes much easier the tool-path strategy and electrode's wear compensation algorithm. This opens new opportunities for micro-EDM-milling technology.
Perdaems Pauline, Jeanneret Blaise, Giandomenico Nicola, Hélal Didier
Aqua & Gas, e-paper
Tout distributeur d’eau se doit de fournir en permanence un produit de qualité irréprochable. En complément des analyses ponctuelles et des mesures en continu dans les stations de production, les Services Industriels de Genève (SIG), la haute école d’ingénieurs de Genève hepia et Orbiwise SA développent une sonde de mesure de 6 paramètres de qualité d’eau, compacte, installée directement sur le réseau de distribution en fonctionnement, autonome en énergie, à faible maintenance et utilisant la technologie IoT LoRa pour transmettre les données à l’utilisateur.
Aqua & Gas 3/2018: 20-26, 2018
Procedia CIRP 68: 813-818, proceedings of the 19th CIRP Conference on Electro Physical and Chemical Machining, Bilbao, Spain,, 2018
Nicola Giandomenico, Jacques Richard
Proceedings of the 19th CIRP Conference on Electro Physical and Chemical Machining, 23-27 April 2017, Bilbao, Spain
Micro-EDM-Milling has a strong innovation potential because it can perform accurate and detailed cavies with a high aspect ratio. In this technology, the electrode wear and material removal produced by every discharge is determined by the effective power delivered by the generator during every pulse cycle. High speed electronics make now possible the statistical analysis of sparks distributions in real time during the machining but also the measurement and modulation of the characteristics of every spark-discharge. It is now possible to measure and control in real-time the electrode wear and the material removal with extreme accuracy. Our “Smart EDM Generator” has the functions of voltage measurement, spark analysis and process control. It can count the sparks and classified them, control the electro-erosion process and calculate the wear of the electrode. The statistical distribution of the sparks and other parameters can be acquired by the CNC-PC from a direct Ethernet link and be visualized on a specific HMI.