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Contact: Dr Joško Valentinčič

Institution : University of Ljubljana. Laboratory :Faculty of mechanical Engineering, Laboratory for Alternative Technologies. Service / Technology offer: Micro electrical discharge machining.

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Contact: Dr Joško Valentinčič

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  1. Institution: University of Ljubljana Laboratory:Faculty of mechanical Engineering, Laboratory for Alternative Technologies Service / Technology offer: Micro electrical discharge machining Description: Electrical discharge machining (EDM) is a machining technique through which the surface of a metal workpiece is formed by discharges occurring in the gap between the tool, which serves as an electrode, and the workpiece. The gap is flushed by the third interface element, the dielectric fluid. The process consists of numerous randomly ignited monodischarges. During the discharge, the plasma channel is formed as the current conductor and heat generator. On the spot of discharge, a crater is formed. The size of a crater is determined by the discharge energy, which can be set on the machine. The material removal rate is determined by the crater size and the frequency of crater generation. Characteristics: The EDM process can be utilized only for machining electrically conductive materials. Up to now the technology was used for the machining of small holes and for production of microfluidic channels. In the former case, the diameter of the hole depends on the diameter of the electrode. The smallest diameter of the electrode available on the market is 170 mm, but it can be reduced by etching. The smallest diameter of the hole machined in the Laboratory for Alternative Technologies was 128 mm. The microfluidic channels were made in the copper electrode by waterjet technology and mapped to the tool out of hardened steel by sinking EDM. The tool was used for batch production of the microfluidic channels in plexiglass. Utilisation: machining of small holes, producing tools for batch production of microfluidic channels Example (of projects, processes, devices realised using it) producing of capillary nozzles for synthetic fibres, production of microfluidic channels Faculty of Mechanical Engineering Aškerčeva 6, SI-1000 Ljubljana, Slovenia, +386 1 4771 724, +386 1 4771 759, e-mail: lat@fs.uni-lj.si, http://www.fs.uni-lj.si/lat Contact: Dr Joško Valentinčič

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