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- W2388686060 abstract "Blank holder force (BHF) is one of the key parameters controlling material flow in sheet metal forming.Numerous researches have demonstrated that an appropriate variable blank holder force (VBHF) during punch stroke is an effective technique to suppress the wrinkling for both flange and sidewall and delay the onset of tearing.In this paper,a new control objective is proposed based on the definition and analysis of BHF formability window.And then a closed-loop PID control strategy is established to determine the optimal variable BHF for each segmented binder during the punch stroke.Then a rectangular box with different corner radii using segmental binders is adopted to validate the closed-loop simulation,through which the optimal profile of variable BHF is determined for each segmental binder at different punch travel.The simulated result shows the box which is difficult to be formed under constant BHF using aluminum alloy sheet could be stamped successfully without wrinkling and tearing.Finally,the derived trajectories of optimal BHF of the rectangular box were verified on a multipoint variable BHF hydraulic press and the experiment results correspond well with those of FEM simulation." @default.
- W2388686060 created "2016-06-24" @default.
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- W2388686060 date "2007-01-01" @default.
- W2388686060 modified "2023-09-28" @default.
- W2388686060 title "A new strategy for the optimization of variable blank holder force in sheet metal forming" @default.
- W2388686060 hasPublicationYear "2007" @default.
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