Papers by Author: Anurag Sharma

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Authors: Kiyoshi Suzuki, Anurag Sharma, Sadao Sano, Manabu Iwai, Tetsutaro Uematsu
Abstract: Electrically conductive CVD diamond having a high thermal diffusivity, when used as an electrode for micro EDM, revealed very low wear compared to copper and Cu-W electrodes in the case of finish EDM condition, where the short pulse duration is adopted. In this research work polycrystalline diamond (PCD), which has a thermal conductivity similar to that of the electrically conductive CVD diamond, is introduced as a new composite electrode material for EDM. Various properties of PCD with respect to EDM of die-steel (SKD11) and tungsten carbide (G5) have been studied and compared with those of the electrically conductive CVD diamond, copper and copper-tungsten electrode materials. It is found that electrode wear and material removal rate decreased with an increase in thermal conductivity depending on the type of the PCD material when very short pulse duration of te=1µs is applied. Extremely low wear, 1/20~1/50 times of the Cu-W electrode in the case of EDM of tungsten carbide workpiece at short pulse duration and zero wear in the case of EDM at short and long pulse duration of SKD11 can be realized.
Authors: Anurag Sharma, Shoji Mishiro, Kiyoshi Suzuki, Tomoyasu Imai, Tetsutaro Uematsu, Manabu Iwai
Authors: Manabu Iwai, Tetsutaro Uematsu, Li Lin, Anurag Sharma, Kiyoshi Suzuki
Authors: Kiyoshi Suzuki, Manabu Iwai, Anurag Sharma, Tetsutaro Uematsu, M. Kunieda, C.S. Liu
Authors: Kiyoshi Suzuki, Manabu Iwai, Tetsutaro Uematsu, Anurag Sharma
Authors: Shoji Mishiro, Hu Bin Qun, Tomoyasu Imai, Anurag Sharma, Kiyoshi Suzuki, Tetsutaro Uematsu, Manabu Iwai
Authors: Kiyoshi Suzuki, Hu Bin Qun, Shoji Mishiro, Katsutoshi Tanaka, Tomoyasu Imai, Anurag Sharma, Tetsutaro Uematsu, Manabu Iwai
Authors: Kiyoshi Suzuki, Manabu Iwai, Anurag Sharma, Shinichi Ninomiya, Tetsutaro Uematsu, Sadao Sano
Abstract: The performance of electrically conductive CVD (called EC-CVD) diamond thick film possessing a high thermal diffusivity has been examined as an electrode for fine electrical discharge machining (EDM). The results indicate a possibility of zero wear in EDM as compared to copper and copper-tungsten (Cu-W) electrodes. It is particularly significant at short pulse EDM conditions, where the EC-CVD diamond electrodes showed increased machining efficiency and a remarkably low wear. In EDM of tungsten carbide, a very low electrode wear ratio of 0.3% was realized with the EC-CVD diamond electrode. Zero wear EDM could be achieved even for sharp V-shapes with included angles of 15 and 30° with V-shaped EC-CVD diamond electrodes. Thermal FEM analysis to examine the relation between the thermal diffusivity and temperature distribution at short pulse duration indicated lowest temperature on EC-CVD diamond electrode surface.
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