الفهرس | Only 14 pages are availabe for public view |
Abstract ABSTRACT Abstract Springback is considered as one of the main drawbacks in sheet metal forming processes in general and especially for Aluminum Alloys. Presently, finite element (FE) analysis is used to enhance the understanding of sheet metal forming processes. In this study, a FE model was built using the commercial finite element package ”Pam- Stamp’P?”, to investigate and compensate the springback process of an industrial part made of the Al-alloy (AA5754). Advanced material hardening models (namely: Isotropic model, Chaboche model and , Yoshida - Uemori model) were used and compared to accurately predict the springback action of the proposed part. After validating the FE model with experimental trials, the optimum process parameters that provide parts with minimum deviation from part design were obtained using Taguchi approach. The effects of forming pressure, cushion pressure and holding time were also investigated. It was found that increasing the forming pressure and/or the holding time decreases the total springback of the part. On the other hand, decreasing the cushion pressure decreases the total springback of the part. Keywords: Springback, Springback compensation, Aluminium alloys, AA5754, Taguchi’s technique, FE Model, Chaboche model, Yoshida-Uemori model, Cold forming parameters. |