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Yunlin, Taiwan

Chen S.L.,Daxue Rd | Chang H.-J.,Daxue Rd | Lee J.-N.,No.840 | Chen S.-T.,No.64
Applied Mechanics and Materials

The current evaluation of machine tools' machining performance relies on instruments measurement but not actual/real machining method. However, using instruments measurement evaluation is not only costly but also due to the installation defect of instruments, resulted in performance examination errors. This paper proposed to use titled condition of 10-15 degrees on the base of part's clamp with VERICUT® software to perform simulation for achieving the purpose of examine tools' machining performance. Findings showed that under the tilted condition of 10-15 degree, turn-mill type of interruptions occurred and unable to proceed. Modification on the cone frustum and anti-cone frustum design was applied to overcome turn-mill interruptions issues. This simulation results showed achievement of turn-mill type tools' machining performance evaluation with anti-cone frustum design. © (2013) Trans Tech Publications, Switzerland. Source

Chang Y.-N.,No.64 | Kuo C.-M.,No.64
Applied Mechanics and Materials

In this paper, a series resonant converter with high-frequency high-voltage transformer for plasma generator is presented. The high-frequency, high-voltage electric source is designed by employing a series load-resonant converter with the plasma generator as part of the electric circuit. The equivalent circuit of this high-frequency transformer modeled by the introduction of the stray capacitance is proposed and the circuit model of the high-voltage plasma generator is conducted as well. Thus, the overall model of the high-voltage plasma generator is built and the designing procedures for appropriate selections of the corresponding resonant-circuit parameters can be established. Finally, a high-voltage plasma generator with 220V, 60Hz, and 1kW input, plus a 22 kHz and over 8kV power converter output, is realized and implemented. © (2013) Trans Tech Publications, Switzerland. Source

Hsu H.J.,No.64 | Lee S.Y.,No.155 | Jiang C.P.,No.64
Applied Mechanics and Materials

The aim of this study is to develop a novel maskless-curing slurry stereolithograhy and sintering process which can fabricate high strength ceramic parts. Three dimension printing of additive manufacturing method was used. High performance stereolithography slurry, which was composed of zirconia powder as structure material and methanol as a solvent and a dispersant, could be prepared with colloidal processing. During layer casting, the diaphanous slurry can penetrate into pores of the subjacent layers. After drying, the binder in the penetrated liquid could connect the fresh layer and subjacent layers. Eventually, a gel-like green block could be built layer by layer. In the exposed region, the resin contained in the green block was cured to connect the zirconia powders to be a part of the rigid green part. The obtained rigid green part was then heated up to 300°C for binder burnout, and then sintered at 1350°C to obtain a high dense zirconia ceramic part. The proposed method of maskless-curing slurry was briefly described and it was proved that the good capacity of solidifying thin layer. © (2014) Trans Tech Publications, Switzerland. Source

This study applies the finite element method (FEM) in conjunction with an abductive network to predict the workpiece surface parameters, including contact area ratio, surface roughness, skewness and kurtosis, of asperity flattening in sliding contact for metallic thin film on die material during the metal forming process. Contact area ratio, surface roughness, skewness and kurtosis are investigated for different process and material parameters, such as sliding distance, elastic modulus of film, normal pressure and bulk strain rate by finite element analysis. The abductive network is then utilized to synthesize the data sets obtained from numerical simulations, and the prediction model is established for predicting surface parameters. The predicted results of the surface parameters from the prediction model are in good agreement with the results obtained from the FEM simulation of workpiece asperity flattening in sliding contact for metallic thin film on die material. © 2011 Trans Tech Publications. Source

Tsai Y.-H.,No.64 | Hwang S.-J.,No.64 | Hwang Y.-L.,No.64
Applied Mechanics and Materials

This paper proposes a method of the geometric design for a new conjugate tooth profiles based on the envelope theory and coordinate transformation method, the mathematical and geometric models for the conforming gears design are proposed. A comparison study on the dynamic contact stress with the involute gear drive is carried out in this work. © (2013) Trans Tech Publications, Switzerland. Source

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