Wrinkle Suppression Method with Quantified Forming Limit for Bending Flange Wrinkles in High Strength Steel Panels

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  • 高強度鋼板のフランジ曲げにおけるしわ発生限界定量化としわ抑制手法の開発
  • コウキョウド コウバン ノ フランジ マゲ ニ オケル シワハッセイ ゲンカイ テイリョウカ ト シワヨクセイ シュホウ ノ カイハツ

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<p>Recently, for the weight reduction of automotive bodies, steel sheets used in automobiles have been becoming thinner owing to the application of high-strength steels. Press forming of high-strength steels, however, has many problems. Wrinkle formation is one of the most serious problems in press forming, especially in the application of highstrength steels. The cause of wrinkle formation has not yet been completely understood, particularly in the case of bending flange wrinkles, which are common in automotive parts forming. There are, therefore, few well-known methods of satisfactorily preventing bending flange wrinkles. In order to prevent bending flange wrinkles, it is important to understand the effect of press conditions on wrinkle formation. In this study, cylindrical forming experiments simulating bending flange wrinkle formation in press forming of automotive body parts were conducted to clarify the forming limit for wrinkles, that is, the critical circumferential strain, which is the threshold of bending flange wrinkle formation. In addition, a new method of wrinkle suppression by die shoulder shape optimization was developed on the basis of the results of the above experiments. A die shoulder shape was designed such that the edge of the blank remains in contact with the die shoulder. The superiority of the developed design method was verified by forming experiments.</p>

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