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| Numerical Simulation and Experimental Validation of Distortional Springback of Advanced HighStrength Steel Sheet Metal Forming |
| GUO Chaoqun,CHEN Jun,CHEN Jieshi,XU DongkaiYU Xiangyu,BAI Yanchao |
| (Department of Plasticity Technology, Shanghai Jiaotong University, Shanghai 200030, China) |
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Abstract In order to study the characteristic of advanced highstrength steel (AHSS) distortional springback, an open forming part SRail and semiopen one were designed and stamped using the same draw die. The springback predictions of DP780 under the two process conditions were finished and validated by experiment. A new method to evaluate the distortional springback was proposed, and the impacts of blank holding force, frictional coefficient and material rolling directions to distortional springback were investigated. The results show that, lower blank holding force causes smaller distortion, while no similar rule is found when frictional coefficient changes. Besides, compared with parallel direction blank, vertical direction rolling blank induces larger distortion in the condition of higher blank holding force and frictional coefficient. The results are of help to control the industrial distortional springback.
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Received: 20 July 2009
Published: 29 April 2010
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