One critical problem of sheet formed products is its dimensional accuracy. This is related to springback (elastic recovery), after forming load releasing. It may happen in any forming process; however, it is easier noted and quantified in bending process. Needless to say that this problem is undesirable since it affects assemblies, mainly at aeronautics industry [1]. Although, literature provides some models for predicting springback in conventional bending, this is not the case for non conventional bending using polyurethanic die and that's why the process has been treated on trial and error basis at shop, implying in product discharge. So, this work intends to present a theoretical model for predicting springback. Model validation has been done by experimental results. Predicted values are in a good agreement with these latter.
KEYWORDS:Springback, sheet metal formed by bending process, non conventional bending process.
The Friction Stir Welding Process (FSW/P) is an innovative technique to join metals using the plasticity, not occurring the melting. It was initially applied in aluminum alloys, but recently it has been extended to other materials, for example, copper, steel alloys, polimers and others. In this work it is analyzed the thermo mechanical modelling of the energies involved in the FSW process, performed using AA2024-T3 Alclad aluminum alloy. The temperature of the process surface was also calculated in the interval where it was not measured by type k thermocouples, visual inspection, forging force and energy per weld length analysis were also performed. The equations developed in this work were able to describe the behavior found in the experimental data of temperature and energy per weld length, which allows concludes that can be used to define any temperature point in a region of interest.
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