Analysis of Springback in the Stamping Process with Advanced High Strength Steel Sheets
Date Issued
2008
Date
2008
Author(s)
Liu, Shih-Wei
Abstract
Along with the intensifying of energy crisis and environmental problems, energy saving and safety have become the most important issues for auto-making and related industry. To achieve these goals, weight reduction is most effective, which leads to the fast development and application of advanced high strength steels (AHSS). However, due to the increasing strength, the use of advanced high strength steel has encountered the springback issue, which is more serious and hard to be solved than that occurs in the stamping of conventional steel sheets.omputer aided engineering (CAE) technology has been widely adopted for assisting the development of stamping tools in the design stage. Nevertheless, the accuracy of springback prediction of CAE technology in the sheet metal stamping of advanced high strength steel is yet to be improved. Therefore, this thesis begins with the study of the effects of the simulation parameters on the accuracy of the springback prediction. The finite element code PAM_STAMP was employed and the dimensions of production automotive parts such as side sill were measured to validate the CAE simulations results. An optimum set of simulation parameters was thus determined and the accuracy of the springback prediction by the CAE simulations was then improved.ith the use of the validated CAE model, the stamping die designs for two automotive parts, front bumper inner plate and side sill part, were studied. The multi-stage forming process used to manufacture the parts was designed and simulated by the proposed CAE model. The design concept of springback compensation was applied to reduce the springback on the production parts. With the aid of the CAE technology, optimum stamping die designs for the two automotive parts were proposed and the sound production parts with dimension variations within the design tolerances confirm the validity of the CAE simulations.ue to the applications of advanced high strength steel in automobile are usually the structural parts. The tunnel-beam shape bears the characteristic geometry for these structural parts. In order to study the springback properties in this characteristic geometry, two common forming processes, single bend and double bend, were simulated in the present study. The mechanism of springback was analyzed and the effects of different forming process on the reduction of springback were examined with the aid of the proposed CAE model.
Subjects
advanced high strength steel (AHSS)
stamping
springback compensation
springback mechanism
CAE method
tool design
Type
thesis
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