The Experts below are selected from a list of 5109 Experts worldwide ranked by ideXlab platform

W.-s. Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Numerical simulation of titanium alloy Machining in Electric Discharge Machining process
    Transactions of Nonferrous Metals Society of China (English Edition), 2011
    Co-Authors: B.-C. Xie, Zhiping Wang, Ying Wang, W.-s. Zhao
    Abstract:

    An axisymmetric three-dimensional thermo-physical model for the Electrical Discharge Machining of titanium alloy was developed using finite element method. To efficiently predict the temperature distribution and the material removal rate, the model considers some realistic parameters such as the plasma channel radius based on Discharge current and Discharge duration, the latent heat of melting and evaporation, the percentage of Discharge energy transferred to the workpiece and Gaussian distribution of heat flux. Numerical simulation of the single spark Discharge of titanium alloy Machining in Electric Discharge Machining process was carried out using software ANSYS. The effect of various process parameters on temperature distributions along the radius of the workpiece was reported. Finally, the model was validated through EDM experiments, showing that it can efficiently predict material removal rate. © 2011 The Nonferrous Metals Society of China.

Tomohisa Kato - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Machining Fluid on Electric Discharge Machining of SiC Ingot
    Materials Science Forum, 2014
    Co-Authors: Norimasa Yamamoto, Satarou Yamaguchi, Tomohisa Kato
    Abstract:

    Recently, ingots of silicon carbide have been adapted to be sliced by the wire-cut Electrical Discharge Machining. Fast slicing, and the reduction in the loss are important for slicing of the wafer. In this paper, characteristic features of the Electric Discharge Machining in the ion-exchange water and the fluorine-based fluid were compared for these improvement. The Discharge was caused by a pulse voltage applied to a ingot of silicon carbide and the wire in Machining fluid, and the slicing was proceeded. As a result, improvement of surface roughness and kerf loss was confirmed, for the first time. In addition, the improving methods for fast slicing were considered.

  • Slicing of Rotating SiC Ingot by Electric Discharge Machining
    Materials Science Forum, 2013
    Co-Authors: Norimasa Yamamoto, Satarou Yamaguchi, Tomohisa Kato
    Abstract:

    A new method of Electric Discharge Machining (EDM) is proposed for slicing a large silicon carbide (SiC) ingot in order to realize low kerf loss and fast cut. This principle is based on the rotating ingot, and it is called the rotating slicing method (RSM). It would be defecate the cutting chip effectively and one-point Discharge. In this paper, we reported results of examinations of the RSM experimentally. Unstable Discharge was not observed. Discharge damages on the wire surface were fewer than those of the conventional method. Net cutting speed was almost the same as the present method for the 2-inches ingot. The rotation axis of the ingot should be perpendicular to the feed direction of the wire, and it is important to fix the performance of the EDM such as the kerf loss. Roughness of the cutting surface was 3.4 µm of Ra

  • cutting speed of Electric Discharge Machining for sic ingot
    Materials Science Forum, 2012
    Co-Authors: Hideki Yamada, Norimasa Yamamoto, Satarou Yamaguchi, Tomohisa Kato
    Abstract:

    A new method based on Electric Discharge Machining (EDM) was developed for cutting a silicon carbide (SiC) ingot. The EDM method is a very useful technique to cut hard materials like SiC. By cutting with the EDM method, kerf loss and roughness of sample are generally smaller than those obtained by cutting with a diamond saw. Moreover, the warpage is smaller than that by the diamond saw cutting, and the cutting speed can be 10 times faster than that of the diamond saw at the present time. We used wires of 50 mm and 100 mm diameters in the experiments, and the experimental results of the cutting speed and the kerf losses are presented. The kerf loss of the 50 mm wire is less than 100 mm, and the cutting speed is about 0.8 mm/min for the thickness of a 6 mm SiC ingot. If we can maintain the cutting speed, the slicing time of a 2 inches diameter ingot would be about seven hours.

  • characterization of Electric Discharge Machining for silicon carbide single crystal
    Materials Science Forum, 2008
    Co-Authors: Tomohisa Kato, Toshiya Noro, Hideaki Takahashi, Satarou Yamaguchi, Kazuo Arai
    Abstract:

    In this study, we report Electric Discharge Machining (EDM) as a new cutting method for silicon carbide (SiC) single crystals. Moreover, we discuss characteristics and usefulness of the EDM for the SiC. The EDM realized not only high speed and smooth cutting but also lower surface damage. Defect propagation in the EDM SiCs have been also estimated by etch pits observation using molten KOH, however, we confirmed the EDM has caused no damage inside the SiCs in spite of high voltage and high temperature during the Machining.

  • Electric Discharge Machining for silicon carbide and related materials
    Materials Science Forum, 2008
    Co-Authors: Satarou Yamaguchi, Toshiya Noro, Hideaki Takahashi, Hideyoshi Majima, Yoshihisa Nagao, Katsuhiko Ishikawa, You Zhou, Tomohisa Kato
    Abstract:

    In order to cut the ingots and slabs of the silicon carbide (SiC), we developed the new method of Electric Discharge Machining (EDM). EDM is usually used for the Machining of the metals, and if it is Electric conductive material, it is effective for the Machining. However, if the Electrical resistivity of SiC is high, the Electric current cannot be large enough for and the EDM, and we failed the Machining of SiC. Therefore, we use three methods to keep higher Electric conduction. One is photoconductive, the second is high Electric field effect and it is called avalanche effect, and the third is high temperature effect because usually the resistivity is low when the semiconductor or insulation materials are in high temperature. Thus, we applied three method, and finally can cut the SiC slabs of the resistivity of the order of 10 Ωm, which is almost 1000 times higher than that of the ordinary EDM at least. The flatness of the cutting surface is the same of the metals’ and the cutting rate for the SiC ingots is 10 times higher than that of diamond saw. This technique will be effective for the related materials of SiC, such as diamonds and GaN.

Takashi Miyazaki - One of the best experts on this subject based on the ideXlab platform.

  • Bone Regenerative Potential of Mesenchymal Stem Cells on a Micro- Structured Titanium Processed by Wire-Type Electric Discharge Machining
    The Open Materials Science Journal, 2010
    Co-Authors: Yukimichi Tamaki, Yu Kataoka, In-kee Jang, Takashi Miyazaki
    Abstract:

    A new strategy with bone tissue engineering by mesenchymal stem cell transplantation on titanium implant has been drawn attention. The surface scaffold properties of titanium surface play an important role in bone regenerative potential of cells. The surface topography and chemistry are postulated to be two major factors increasing the scaffold properties of titanium implants. This study aimed to evaluate the osteogenic gene expression of mesenchymal stem cells on titanium processed by wire-type Electric Discharge Machining. Some amount of roughness and distinctive irregular features was observed on titanium processed by wire-type Electric Discharge Machining. The thickness of suboxide layer was concomitantly grown during the processing. Since the thickness of oxide film and micro-topography allowed an improvement of mRNA expression of cells, titanium processed by wire-type Electric Discharge Machining is a promising candidate for mesenchymal stem cell based functional restoration of implants.

  • Bone regenerative potential of mesenchymal stem cells on a micro-structured titanium processed by wire-type Electric Discharge Machining
    arXiv: Cell Behavior, 2010
    Co-Authors: Yukimichi Tamaki, Yu Kataoka, Takashi Miyazaki
    Abstract:

    A new strategy with bone tissue engineering by mesenchymal stem cell transplantation on titanium implant has been dawn attention. The surface scaffold properties of titanium surface play an important role in bone regenerative potential of cells. The surface topography and chemistry are postulated to be two major factors increasing the scaffold properties of titanium implants. This study aimed to evaluate the osteogenic gene expression of mesenchymal stem cells on titanium processed by wire-type Electric Discharge Machining. Some amount of roughness and distinctive irregular features were observed on titanium processed by wire-type Electric Discharge Machining. The thickness of suboxide layer was concomitantly grown during the processing. Since the thickness of oxide film and micro-topography allowed an improvement of mRNA expression of cells, titanium processed by wire-type Electric Discharge Machining is a promising candidate for mesenchymal stem cell based functional restoration of implants.

B.-C. Xie - One of the best experts on this subject based on the ideXlab platform.

  • Numerical simulation of titanium alloy Machining in Electric Discharge Machining process
    Transactions of Nonferrous Metals Society of China (English Edition), 2011
    Co-Authors: B.-C. Xie, Zhiping Wang, Ying Wang, W.-s. Zhao
    Abstract:

    An axisymmetric three-dimensional thermo-physical model for the Electrical Discharge Machining of titanium alloy was developed using finite element method. To efficiently predict the temperature distribution and the material removal rate, the model considers some realistic parameters such as the plasma channel radius based on Discharge current and Discharge duration, the latent heat of melting and evaporation, the percentage of Discharge energy transferred to the workpiece and Gaussian distribution of heat flux. Numerical simulation of the single spark Discharge of titanium alloy Machining in Electric Discharge Machining process was carried out using software ANSYS. The effect of various process parameters on temperature distributions along the radius of the workpiece was reported. Finally, the model was validated through EDM experiments, showing that it can efficiently predict material removal rate. © 2011 The Nonferrous Metals Society of China.

Kais Ben Atig - One of the best experts on this subject based on the ideXlab platform.

  • numerical study of thermal aspects of Electric Discharge Machining process
    International Journal of Machine Tools & Manufacture, 2006
    Co-Authors: Nizar Ben Salah, Farhat Ghanem, Kais Ben Atig
    Abstract:

    This paper presents numerical results concerning the temperature distribution due to Electric Discharge Machining process. From these thermal results, the material removal rate and the total roughness are deduced and compared with experimental observations. It is shown that taking into account the temperature variation of conductivity is of crucial importance and gives the better correlations with experimental data.