Skip to Main content Skip to Navigation
Theses

Caractérisation expérimentale et modélisation numérique des procédés de profilage de barres par déformation plastique à froid avec des outils roues

Abstract : The methods of cold rolling of rods are widely used in manufacturing industries to obtain pieces with complex profiles. In this study, profiles with circular grooves have been formed by in-feed methods using two rolls. To this end, an experimental system mounted on a lathe was constructed. The work-piece is rotated by the lathe and the penetration of the rolls is ensured by jacks. The system allows us to record the process parameters, in particular the displacement of the rolls and the radial rolling force. The material behavior of the 4 selected steels has been characterized in tension, torsion and compression. The results obtained in compression are most pertinent. They allow us to obtain effective strain up to [epsilon] = 0,9. Strain-hardening has been characterized by a modified Johnson-Cook law, which takes account of thermal effects and strain-rate sensitivity effects at the strain-rates utilized. The rolling tests have been analyzed using a wide range of jack pressures and rotation rates. In addition, micro-hardness measurements have been made in an axial section, as well as roughness measurements on the surface of the teeth. Numerical simulations of the process have been carried out. The mesh has been defined in order to account for the very strong strain gradients, while keeping a reasonable computation time. The comparisons with experimental results show a good agreement concerning the radial rolling force. The correspondence between measured micro-hardness values and calculated effective stress levels also has been established
Document type :
Theses
Complete list of metadata

Cited literature [51 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01749172
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 12:08:34 PM
Last modification on : Friday, February 26, 2021 - 2:48:03 PM
Long-term archiving on: : Friday, September 14, 2018 - 6:30:56 PM

File

Floca_Marincei.Luminita.SMZ114...
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01749172, version 1

Citation

Luminita Marincei. Caractérisation expérimentale et modélisation numérique des procédés de profilage de barres par déformation plastique à froid avec des outils roues. Autre. Université Paul Verlaine - Metz, 2011. Français. ⟨NNT : 2011METZ045S⟩. ⟨tel-01749172⟩

Share

Metrics

Record views

72

Files downloads

1209