Optimization of variable blank holder force trajectory for springback reduction via sequential approximate optimization with radial basis function network

Optimization of variable blank holder force trajectory for springback reduction via sequential approximate optimization with radial basis function network

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Article ID: iaor2013671
Volume: 47
Issue: 2
Start Page Number: 289
End Page Number: 300
Publication Date: Feb 2013
Journal: Structural and Multidisciplinary Optimization
Authors: , ,
Keywords: manufacturing industries, optimization
Abstract:

Springback is one of the major defects in sheet metal forming. Variable blank holder force (VBHF) approach is one of the effective ways for the springback reduction. In this paper, the VBHF trajectory is optimized to reduce the springback by a sequential approximate optimization (SAO) with radial basis function (RBF) network. The U‐shaped forming in NUMISHEET’93 is employed to determine an optimum VBHF trajectory, for example. In this paper, the bending moment is taken as the objective function. The tearing of sheet during the forming is considered as the design constraint, and the forming limit diagram (FLD) is employed to evaluate the design constraint quantitatively. It has been found from numerical results that the optimal VBHF trajectory can drastically reduce the springback in comparison with various VBHF trajectories. Through the theoretical examination and numerical simulation, the springback reduction of metal forming by the VBHF trajectory is discussed.

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