ひずみ速度を考慮した加工硬化則に関する考察と薄鋼板のスライドモーション加工の解析

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タイトル別名
  • Material Model Incorporating Strain Rate and Sheet Metal Forming Analysis Under Slide Motion
  • ヒズミ ソクド オ コウリョ シタ カコウ コウカソク ニ カンスル コウサツ ト ウスコウハン ノ スライドモーション カコウ ノ カイセキ

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抄録

Recent experimental findings have suggested that the slide motion of sheet metal forming driven by servo-drive presses enhances its formability and forming accuracy. Previous studies have focused primarily on the relationship between the lubricated condition and formability in sheet metal forming. However, little attention has been paid to the relationship between flow stress and formability under slide motions. In this study, we have found that flow stress, which depends on the strain rate, affects the thickness reduction. Stress-strain curves under various strain rates were measured, and the stress-strain curves were evaluated using the Tanimura-Mimura model, which is defined as the sum of a function based on a static tensile test and a function of strain rate. The parameters in the Tanimura-Mimura model and the Cowper-Symonds model were identified using the stress-strain curves in the entire measurable strain range by the nonlinear least- squares method, and the stress-strain curves calculated using the Tanimura-Mimura model exhibited better correspondence with the experimental stress-strain curves. Then, FEM analysis of sheet metal forming under slide motion was performed using this model. As a result, the strain rate of the punch shoulder in circular cup drawing was increased, and the localization of thickness reduction was relieved by adopting the slide motion.

収録刊行物

  • 塑性と加工

    塑性と加工 56 (658), 993-998, 2015

    一般社団法人 日本塑性加工学会

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