Title: Evaluation of Friction in Ultrasonic Vibration-assisted Press Forging Using Double Cup Extrusion Tests
Authors: Hung, Jung-Chung
Huang, Chi-Chen
機械工程學系
Department of Mechanical Engineering
Keywords: Double cup extrusion test;Finite element simulation;Friction evaluation;Ultrasonic vibration
Issue Date: 1-Dec-2012
Abstract: 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 ill metal forming process. The friction ploys 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 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.
URI: http://dx.doi.org/10.1007/s12541-012-0278-x
http://hdl.handle.net/11536/20863
ISSN: 2234-7593
DOI: 10.1007/s12541-012-0278-x
Journal: INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
Volume: 13
Issue: 12
Begin Page: 2103
End Page: 2108
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