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Contribution à la modélisation du comportement dynamique du système de production composé de la machine et de ses outillages durant la phase de mise en forme. Application aux machines pilotées en énergie : de la presse à vis au pilon contre-frappe

Abstract : The issue in forging operations is to obtain final product with controlled geometries and microstructure. Several phenomena influence the process, of which one is the machine behavior. The high forging load and the important deceleration of moving parts during billet deformation cause dynamical phenomena which imply energy losses. For energy driven machines, as screw presses and hammers, the measurement of forging load and moving parts displacements can be complex, because of the extreme conditions concerning temperature, impact velocity and developed energy. Therefore, only theoretical models without direct links with reality have been proposed to represent machine behavior. The purpose of this work is to develop a new methodology to model the machine and tools behavior, in order to improve the predictivity of forging process simulations. The model and its parameters are obtained from experimental measurements, which provides a tailored solution, specifically adapted to the {machine + tools} system and applicable to any energy driven machines. The numerical methods and measurement protocols needed to apply the methodology are developed for three machine technologies. The predictive capacity of the model is then validated, step-by-step for different configurations, until reaching the modelling of a counterblow hammer. Simultaneously, the model is exploited to quantify process efficiency and better understand the energy consumption during forging operations.
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https://pastel.archives-ouvertes.fr/tel-03128455
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Submitted on : Tuesday, February 2, 2021 - 11:25:24 AM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM
Long-term archiving on: : Monday, May 3, 2021 - 6:30:05 PM

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  • HAL Id : tel-03128455, version 1

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Jean-François Mull. Contribution à la modélisation du comportement dynamique du système de production composé de la machine et de ses outillages durant la phase de mise en forme. Application aux machines pilotées en énergie : de la presse à vis au pilon contre-frappe. Génie mécanique [physics.class-ph]. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE057⟩. ⟨tel-03128455⟩

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