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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Formability and Spring-back Issues in Ultra-high Strength Steels and High Strength Aluminum Alloys
Presentation Title Roller Bending/Unbending Process for Improving the Local Mechanical Properties of Aluminum Sheets
Author(s) Katherine Rader, Wahaz Nasim, Angel Ortiz, Nathan Canfield, Kyoo Sil Choi, Mert Efe
On-Site Speaker (Planned) Katherine Rader
Abstract Scope This study introduces a novel thermo-mechanical process to modify the local mechanical properties of 6xxx aluminum alloy sheets. In this process, rollers travel along the length of a sheet while locally bending and unbending it so that the final shape and thickness of the sheet is unchanged. Room temperature bending/unbending produces local hardening in both T4 and T6 sheets (with 41% and 18% greater Vickers hardness, respectively). High temperature bending/unbending, which can be performed at temperatures between 350°C and 550°C via induction heating, produces significant improvements in local formability as measured by bend testing. Formability levels equivalent to the T4 temper are achieved within the processed zones of T6 sheets (with bend angles of 161° and 164°, respectively). These mechanical property improvements are explained through finite element simulations and microstructural characterization. This process could be integrated with roller hemming robots to process selective regions of high strength aluminum sheet materials.
Proceedings Inclusion? Planned:
Keywords Shaping and Forming, Aluminum, Mechanical Properties


A Investigation of the Bendability of Friction-stir Processed Aluminum 7075 & 6111 Alloys and Its Effect on Formability
Anisotropic Fracture of Mild and Advanced High Strength Steel in Non-linear Strain Paths
Dimensional Control in Flexible Fabrication of Sheet Metals for Automotive Applications
Hot Stamping of Third Generation Advanced High Strength Steels
Hybrid Bead Development and Validation; Auto Steel Partnership
Influence of Yoshida-Uemori Model on Springback Prediction
Microstructure and Mechanical Properties According to Heat Treatment of High Tensile Strength Steel Alloy
On Local Formability of Multi-phase Ultra-high-strength Steels
Retrogression Forming and Reaging for Forming and Joining AA7075-T6 Sheet
Roller Bending/Unbending Process for Improving the Local Mechanical Properties of Aluminum Sheets
The “Next Era in Stamping Technology” (NEST), The Fundamentals of a Hybrid Stamping Technology

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