Instituições de ensino: AS INGPEED
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This work aims to experimentally investigate the influence of rotational velocity of the tool-electrode (with diameter of 110 m), varied within defined limits, on the tool wear (tool-electrode wear), producing microholes using the electro chemical discharge machining (ECDM). Two different materials of tool-electrodes were used to perform these experiments: hard metal and tungsten. In other words, for each one of these electrically conductive materials, the tool-electrode movement has been modified in 20, 1000 and 2000 RPM using a tool-machine AGIE Compact 1, electronically and mechanically adapted to the ECDM-machining process to produce holes with small diameters. As working medium of the ECDM-technology a passivating electrolyte solution of Na2SO4 with extremely low conductivity in mS/cm was applied to machine holes in stainless plates with a thickness of 0,6 mm as workpiece material. The experimental results shown significant differences related to the tool-electrode wear being investigated for the rotation levels indicated above. These results are explained in the paper in terms of physical properties of the tool-electrode materials and, mainly, based on electronical characteristics of the power supply (a relaxation generator) of the machine AGIE that controls the total energy of the ECDM-pulses directly responsible for the material removal of the microhole being machined and, consequently, for the generation of debris in the working gap during the machining process. Finally, this article also gives an extremely important technological contribution for the future development of specific generators of high performance to achieve the best work results applying the ECDM-machining, tanking into account the movement characteristics of the tool-electrode penetrating into the workpiece being machined.
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