京都大学 · 工学
Hama教授の研究室では、特に金属成形における加工性と成形品質の向上を目的とした基礎的・応用的研究が進められています。主にマグネシウム合金やチタン、アルミ合金などの軽量金属材料を対象に、成形時の応力・応答挙動、スプリングバック、時間依存性挙動の解明を実験と数値シミュレーションを組み合わせて行っています。特に、熱成形、水圧成形、ハンマリング成形などのプロセス最適化に向けた知見の構築が強みです。
Figures are computed from collected data and may differ slightly.
In this study, we carried out a two-dimensional draw-bending test on an AZ31B magnesium alloy sheet at various forming temperatures and blank holding forces, and the springback characteristics of the Mg alloy sheet were systematically examined. The amount of springback decreased with increasing temperature and blank holding force. The decrease in the amount of springback caused by the increase in temperature was much larger than that caused by the increase in blank holding force, which indicated
Recently, tube hydroforming is receiving increasing attention. Knowledge on the process is, however, still insufficient to produce high-quality products in an efficient way. Hammering hydroforming, in which the hydraulic pressure is pulsated synchronously with axial feeding, is an effective method of improving forming ability. However, the factors that cause the improvement are still unclear. In the research reported in this paper, simulations of an automotive component produced by hammering hyd
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