An alternative explanation of forming force reduction for forming 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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Modelling of forging processes assisted by piezoelectric actuators : principles and experimental validation GIRAUD-AUDINE, Christophe; NGUYEN, Thanh Nung; 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 ...
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 ...
NGUYEN, Thanh Hung; GIRAUD-AUDINE, Christophe; AMBERG, Michel; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; BIGOT, Régis (IEEE, 2014)This paper presents the design of a mechatronic system integrating iezoelectric multi-actuators, which is used to generate low-frequency vibrations to assist the forging process. With the aim of controlling the complete ...
Modelling of piezoelectric actuators used in forging processes: principles and experimental validation NGUYEN, Thanh Hung; GIRAUD-AUDINE, Christophe; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; BIGOT, Régis (IEEE, 2012)This paper deals with the modelling of a piezo- electric stack actuator used to generate specific low frequency vibration waveforms to assist forging processes. Experimental results show that such waveforms reduce the ...
Experimentally valided approach for the simulation of the forging process using mechanical vibration LY, Rith; GIRAUD-AUDINE, Christophe; ABBA, Gabriel; BIGOT, Régis (Springer Link, 2009)In this study, an experimental setup of a forging process has been designed which allows to apply vibrations to the lower die of amplitude ranging from 0 to 80 ?m at frequencies varying from 1 to 130Hz thanks to the use ...