An alternative explanation of forming force reduction for forming process submitted to vibration: Influence of the waveform in the viscoplastic domain
TypeArticles dans des revues avec comité de lecture
This article addresses the effects of vibrations on a viscoplastic workpiece applied during the forgingprocess. To achieve this goal, a phenomenological model based on the slice method combined with aNorton–Hoff viscoplastic law is developed. It allows to study the impact of vibration on the reductionof the mean forging load which has been experimentally observed before, and demonstrates that thesensitivity to strain rate is a key parameter. Moreover, based on the model, a new waveform of thevibrations is proposed that enhance the mean forging load reduction. Finite element simulations andexperiments have been performed to evaluate the validity of the model in the case of sinusoidal andtriangular waveforms, and are in good agreement with the analytical model’s predictions.
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Progressive wave: a new multisource vibration technique to assist forming processes - kinematic study, simulation results and design proposition KHAN, Armaghan; NGUYEN, Thanh Hung; GIRAUD-AUDINE, Christophe; ABBA, Gabriel; BIGOT, Régis; LEMAIRE-SEMAIL, Betty (2013)Use of vibration in the forming process has already shown numerous advantages in the improvement of mechanical and surface properties of workpiece such as good surface or less friction between die and workpiece. The aim ...
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KHAN, Armaghan; NGUYEN, Thanh Hung; GIRAUD-AUDINE, Christophe; ABBA, Gabriel; BIGOT, Régis; LEMAIRE-SEMAIL, Betty (EDP Sciences, 2014)Application of vibration in metal forming process has already shown numerous advantages in the past. It improves not only mechanical and surface properties of workpiece but the integration of vibration in metal forming ...
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Modelling of forging processes assisted by piezoelectric actuators : principles and experimental validation GIRAUD-AUDINE, Christophe; NGUYEN, Thanh Hung; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; BIGOT, Régis (IEEE, 2014)This paper presents the modelling of a forging processes assisted by a piezoelectric actuator (PA), which is used to generate specific low frequency vibration waveforms. Experimental results show that such waveforms reduce ...