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This grinding technique allows metal-bound grinding discs to be used, which are after all highly durable and difficult to adjust compared with discs with resins or glass.
Moreover, ELID grinding allows a work piece with good geometrical accuracy in combination with a highly smooth surface to be obtained, making a polishing stage redundant. A passivation layer of oxides forms on the circumference of the grinding wheel, which reduces the retention force of the matrix on the abrasive grains, meaning removing blunt granules from the grinding disc is made easier.
This means that new granules are constantly being exposed on the disc surface. The procedure furthermore allows grinding wheels with extremely fine granules to be used ca. The figures below show two examples of ELID surface grinding. The figure on the left showed a component in ZrO 2 of 50 mm long and 20 mm wide with a roughness S a of 0. Despite ELID grinding being a success primarily in Japan, the technology is not yet commercially available to us, and for the time being can only be found in lab environments such as the PMA department at KU Leuven.
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Low surface roughness and extremely high precision thanks to ELID grinding
ELID Grinding, since its introduction over two decades ago, has helped in material removal of hard and difficult-to-cut engineering materials. A gist of the important research milestones on the process has been organized in this report. Electrolysis takes place between the conductive anodic wheel and highly conductive cathode in presence of a special electrolyte. The resulting anodic oxide wears off easily to allow efficient grinding. The different parameters involved in electrolysis complicate the mechanism of grinding and makes it significantly different from conventional grinding. Different variants of the process have also been reported, though the basic philosophy of operation is the same as basic ELID. Several authors have also suggested mathematical explanations, among other fundamental studies, that provide further insight.
ELID Grinding for Final Finishing Operation
Electrolytic In-Process Grinding ELID is an advanced grinding process that carries out in situ dressing of the grinding wheel using an electrochemical reaction, i. This process is targeted to achieve the final finished product by eliminating subsequent finishing processes such as polishing and lapping. The process mainly aims for hard and brittle materials to achieve ductile mode cutting with the best cutting parameters, and by doing so to achieve the nano-level surface finish. A characteristic ELID wheel is metal bonded which is used as an anode. There is another electrode which usually used as the cathode, and a liquid is flown between the anode and the cathode, which functions both as grinding fluid and electrolyte. A DC pulsed power supply is generally used as the power source for the electrolytic in-process dressing of the grinding wheel.