电流辅助高强钢板热成形工艺数值模拟研究

目的探究电流辅助高强钢板热成形工艺中坯料自阻加热的加热机理,揭示电一热一力三场耦合条件下金属板材的塑形变形规律,为工艺方案及工艺参数的制定提供理论依据。方法利用FEM软件对电流辅助高强钢板的热成形过程进行了数值模拟研究。结果获得了通电加热时坯料的温度场,并通过热一力耦合分析,得到了板材热成形时的应力及应变的分布规律。结论采用该加热方式可极大地提高加热速率,经过几十秒的加热即在变形坯料上获得了较均匀的温度场,满足板材热成形要求。应力、应变分析表明,加热时产生的压应力缓解了坯料变形时的应力集中,有助于板料塑性成形。

Numerical Simulation of Current Assisted Hot Stamping of High Strength Steel

To reveal the mechanism of resistance heating and to reveal the sheet metal deformation law during the current assisted hot stamping of high strength steel, FEM software was applied to numerical simulate this process. The temperature distribution on the metal plate blank has been obtained, and the regularities of distribution of stress and strain have also been solved. The results show that the heating efficiency could be significantly improved by this method, and the appropriate temperature field for the hot stamping could also be obtained. During the forming process, the stress concentration has been decreased by the compressive stress which was generated by the heating process, which was helpful to the sheet metal forming.