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      주제어 : Double cup extrusion (검색결과 2 건)
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      • KCI등재

        Work Efficiency in a Double Cup Extrusion Process

        노정훈,황병복 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3

        A double cup extrusion process (DCEP) has been analyzed numerically to investigate the characteristics of energy consumptions for a selected model material, AA 2024 aluminum alloy. The forming energy in a double cup extrusion process was analyzed in terms of ideal, redundant and frictional energy or work, which constitute of a total forming energy in metal forming process. Ideal and theoretical forming or deformation efficiencies were also examined for various process parameters chosen for analysis. The objective of this study is to investigate the influence of geometrical process parameters in DCEP on the characteristics of energy consumption or dissipation. It was revealed from this study that frictional energy was expected to be more dissipated for high reductions and low thickness ratios. It was also found that the theoretical work efficiency would decrease as the thickness ratio increases and the reduction decreases.

      • KCI등재

        Evaluation of Friction in Ultrasonic Vibration-assisted Press Forging Using Double Cup Extrusion Tests

        Jung-Chung Hung,Chi-Chen Huang 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.

        Ultrasonic energy is applied to a die in an ultrasonic vibration-assisted metal forming process, and the die is used to deform the workpiece. The friction between die and workpiece decreases when ultrasonic vibration is applied in metal forming process. The friction plays a crucial role in metal forming; therefore, the friction force must be evaluated and quantified to obtain the optimal forming process. The ring compression test is widely used to evaluate the friction factor or coefficient of friction. However, the ring compression test is unsuitable to determine the friction condition in forging and extrusion processes. Therefore, this study evaluated the effect of ultrasonic vibration on the friction factor using double cup extrusion tests (DCET). The apparatus design for ultrasonic vibration-assisted DCET and experiments were conducted, and the commercial finite element software Marc was used to simulate the DECT to obtain the friction calibration curves. The results demonstrated that the evaluation of the interface friction factor using DCET is sensitive. Under no lubricant condition, the friction factors of traditional and ultrasonic vibration-assisted DCET were approximately 0.1 and 0.3, respectively. Under Blue Moly lubricant condition, the friction factors of traditional and ultrasonic vibration-assisted DCET were approximately 0.05 and 0.1, respectively.

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