高強度鋼の冷間据込みにおける荷重および平面度の簡易予測

書誌事項

タイトル別名
  • Convenient Prediction of Load and Flatness in Cold Upsetting of High-strength Steel
  • ―Load Reduction and High Flatness Accuracy Using Convex Tools―
  • ―凸面工具による荷重低減と高平面精度化―

抄録

<p>Recently, the simple upsetting of high-strength steel has often been performed without heating and lubrication at a high compression ratio to improve the environment by sustainable manufacture and a productive automobile. Under these severe conditions, the extremely high pressure causes the tool to be elastically concaved. The shaped tool induces an increase in upsetting load and a decrease in the flatness of upset products. In this study, the convex tool with a small slope is investigated experimentally and analyzed by finite element method (FEM) to reduce the overload and improve the flatness. The obtained load (Fc = C1CAY = C1Fs) indicates a second correction factor C1 for modifying the load Fs which is estimated by a conventional slab method as Fs = CAY, where the coefficient C is determined by friction coefficient and product height diameter ratio, and A and Y are the cross-sectional area and flow stress of the work, respectively. Additionally, the modified flatness αt = C2 (δ0 - δR ) of the work is estimated by a combination of the elastic theory and FEM analysis, where the correction coefficient C2 is determined by FEM analysis and δ0 - δR is the elastic difference between the thickness δ0 at the center and the thickness δR at the outer diameter of the work.</p>

収録刊行物

  • 塑性と加工

    塑性と加工 65 (759), 45-51, 2024-04-25

    一般社団法人 日本塑性加工学会

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