The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Naotake Mohri - One of the best experts on this subject based on the ideXlab platform.
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Changes in Surface Roughness Caused by Electrical Discharge Coating
International Journal of Automation Technology, 2019Co-Authors: Hideki Takezawa, Naotake Mohri, Toshiya KusamaAbstract:The effects of surface modification using an Electrical Discharge coating are investigated. The electrode used for the machining process is a Ti-type semi-sintered compact electrode. A thin and hard layer is formed on the machining surface. In this paper, the change in surface roughness during Electrical Discharge coating is described. The accretion layer surface became coarse after 10 min of machining. The peak height also increased. After 30 min of machining, the height of the accretion layer was lower than the original surface level, and the peak height decreased. Furthermore, the core roughness value increased. The surface roughness increased within several minutes from the start of Electrical Discharge coating using a Ti-type semi-sintered compact electrode. In this paper, we report on the temporal change of surface roughness during Electrical Discharge coating.
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Possibility of Electrical Discharge Pulse Sound for Hammering Test
Nondestructive Characterization for Composite Materials Aerospace Engineering Civil Infrastructure and Homeland Security 2007, 2007Co-Authors: Yoshiaki Akematsu, Naotake Mohri, Kazuro Kageyama, Hideaki Murayama, Makoto KanaiAbstract:In this study, it was investigated that the possibility of Electrical Discharge pulse sound for new inspection technologies instead of hammering test. Electrical Discharge pulse sound was applied for hammering sound and sensor by using sound detection was applied for optical fiber vibration sensor. The numerical analysis result using the FEM and the experiment result along with the single pulse Discharge was compared. As the result, it was estimated that the generation factor of the elastic wave was same as the current duration. These results become possible to estimate the propagation characteristic of elastic wave. Evaluation of Electrical Discharge sound for hammering test by using optical fiber sensor was investigated. Defect shape and scale was estimated from comparison with detected waveform by using optical fiber vibration sensor and simulated waveform. As the results, it was considered that Electrical Discharge sound was available for hammering test.
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Characteristics of Electrical Discharge Pulse Sound for Hammering Test
Materials Science Forum, 2007Co-Authors: Yoshiaki Akematsu, Naotake Mohri, Kazuro Kageyama, Hideaki Murayama, Makoto KanaiAbstract:In this study, the possibility of Electrical Discharge pulse sound for new inspection technologies instead of hammering test was investigated. Electrical Discharge pulse sound was applied for hammering sound and sensor by using sound detection was applied for the optical fiber vibration sensor. Elastic wave was detected by optical fiber vibration sensor during Electrical Discharge. The plate thickness was changed from 0.5mm to 10mm. On the assumption that generation factor of elastic wave was only depending on a force, numerical analysis by using the finite element method (FEM) was adapted. The numerical analysis result using the FEM and the experimental result along with the Electrical Discharge were compared. The plate thickness was estimated by comparing with experimental signal and simulation one. It was found that plate thickness was able to estimate from comparing with experimental signal and simulation one. Moreover, a quasi-defect was created the plate by comparing with experimental results and simulation one. It was found that the defect shape was able to estimate by comparing with experimental results and simulation one.
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Recent evolution of Electrical Discharge machining
4M 2006 - Second International Conference on Multi-Material Micro Manufacture, 2006Co-Authors: Naotake Mohri, Takayuki TaniAbstract:Electrical Discharge machining (EDM) is a comparatively new machining method which has several decades of history since it has been invented. At its beginning, it was developed as a precision machining method for hard materials. In recent years, several researches and methods based on the Electrical Discharge phenomena have been proposed. Mirror like finish machining, surface modification of mold die, machining of insulating materials and micro products manufacturing are noted among these researches and methods in the EDM field. These methods are particularly concerned with control of surface characteristics of the work piece and with control of electrode motion. In this paper, we introduce and discuss surface machining methods, insulating ceramics machining by EDM and micro EDM with which we have been associated.
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Electrical Discharge machining properties of noble crystals
Journal of Materials Processing Technology, 2004Co-Authors: Yasushi Fukuzawa, Naotake Mohri, Takayuki Tani, Apiwat MuttamaraAbstract:Abstract As previously reported, several insulating ceramics such as Si3N4, SiC and ZrO2 have successfully been machined by sinking Electrical Discharge machining using the surface Discharge modification phenomenon. As unstable Discharges occur during the machining of Al2O3 ceramics, inferior machining properties have been obtained as compared to other ceramics. It seems that the formation process of the Electrically conductive layer on the workpiece during Discharge is much different compared with that of other dissociated ceramics at high temperature. In this study new methods are devised and the Electrical Discharge machining mechanism of insulating Al2O3 ceramics is researched using high purity alumina and single crystal Al2O3 of sapphire. Machining properties are dependent on the purity and structure of the workpiece, and correlated to its thermal properties.
John Glover - One of the best experts on this subject based on the ideXlab platform.
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Reactions of oxygen and toluene in an Electrical Discharge reactor
Journal of Chemical Technology & Biotechnology, 2007Co-Authors: Karl R. Eriksson, Brian W. Brooks, John GloverAbstract:Gaseous mixtures of oxygen and toluene have been passed through a 50 Hz Electrical Discharge reactor at low pressure. Oxidation reactions produced benzaldehyde, benzene, benzyl alcohol and cresols. Reaction rates varied with partial pressure of reactants, Electrical field strength and temperature, although, in the absence of an Electrical Discharge the thermal reaction was negligible. A fit to experimental data was obtained with an equation which included reactant concentrations, temperature and applied voltage.
K. Masui - One of the best experts on this subject based on the ideXlab platform.
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Application of ion nitriding to wire-Electrical-Discharge-machined blanking dies
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 1991Co-Authors: T. Sone, K. MasuiAbstract:Abstract The effects of ion nitriding on wire-Electrical-Discharge-machined (wire-EDMd) surfaces are examined and discussed. The hardness of the softened surface layer caused by wire Electrical Discharge machining was increased up to the matrix value when hardened by ion nitriding, and the wear resistance was significantly improved. As a result of blanking tests in the industrial field, the ion-nitriding process would seem to be very effective for prolonging the service life of wire-EDMd dies.
Karl R. Eriksson - One of the best experts on this subject based on the ideXlab platform.
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Reactions of oxygen and toluene in an Electrical Discharge reactor
Journal of Chemical Technology & Biotechnology, 2007Co-Authors: Karl R. Eriksson, Brian W. Brooks, John GloverAbstract:Gaseous mixtures of oxygen and toluene have been passed through a 50 Hz Electrical Discharge reactor at low pressure. Oxidation reactions produced benzaldehyde, benzene, benzyl alcohol and cresols. Reaction rates varied with partial pressure of reactants, Electrical field strength and temperature, although, in the absence of an Electrical Discharge the thermal reaction was negligible. A fit to experimental data was obtained with an equation which included reactant concentrations, temperature and applied voltage.
T. Sone - One of the best experts on this subject based on the ideXlab platform.
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Application of ion nitriding to wire-Electrical-Discharge-machined blanking dies
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 1991Co-Authors: T. Sone, K. MasuiAbstract:Abstract The effects of ion nitriding on wire-Electrical-Discharge-machined (wire-EDMd) surfaces are examined and discussed. The hardness of the softened surface layer caused by wire Electrical Discharge machining was increased up to the matrix value when hardened by ion nitriding, and the wear resistance was significantly improved. As a result of blanking tests in the industrial field, the ion-nitriding process would seem to be very effective for prolonging the service life of wire-EDMd dies.