A multi-objective Pareto design approach forsimultaneous control of thinning and springback in complex stamping operations.

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Abstract

AbstractIn sheet metal forming operations design, optimization problems have to be solved inorder to reach optimal process conditions. In these problems, there are some crucialissues to be taken into account:- most of the problems are multi objective problems, generally characterized byconflicting objectives: the definition of proper parameters aimed to prevent bothspringback and fracture is a typical example of an optimization problem in sheet metalforming characterized by conflicting goals;- in an industrial environment a great interest would be focused on theavailability of a cluster of possible optimal solutions instead of a single “almostoptimal” solution.Taking into account all these issues, a multi-objectives optimization procedure basedon Pareto optimal solution search techniques seems a very attractive approach to dealwith sheet metal forming processes design.In this paper, integration between numerical simulations, response surfacemethodology and Pareto optimal solution search techniques was applied in order todesign a 3D complex stamping process. Two process parameters (blank holder forceand drawbeads penetration) were utilized as design variables to be optimized in orderto accomplish two different objectives: control thickness distribution along theworkpiece and avoid excessive geometrical distortions due to springback occurrence.The final aim of the research is to develop a predictive tool able to identify a sort ofprocess window for the analysed operation also minimizing the computational effortwith respect to mono-objective optimization techniques or traditional trial and errormethods.
Lingua originaleEnglish
Numero di pagine0
Stato di pubblicazionePublished - 2009

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