锻压技术

高温双相钢的成形性能研究

英文标题：Research on formability of high-temperature dual-phase steel

作者：单云

单位：无锡职业技术学院

分类号：TG386

出版年,卷(期):页码：2014,39(12):120-123

摘要：

针对汽车工业中使用的双相钢DP590在常温冲压加工中易发生拉裂、起皱、起毛和高回弹等缺陷，在不同温度下对双相钢DP590分别进行杯突试验和锥杯试验，研究温度对其IE值和锥杯值的影响，进而评估高温下DP590的成形性能。试验结果表明，随着温度的上升，其成形力不断减小且成梯度变化；杯突值(IE)呈上升趋势，在400 ℃以下增加缓慢，在600～900 ℃时上升较快；锥杯值不断减小。基于屈雷斯加屈服准则，对杯突试验进行了有限元仿真，模拟结果与试验结果相吻合，通过模拟分析预测了杯突试验的破裂位置，分析得出杯突试验产生破裂的原因是由于双拉胀形造成的。

For the defects of cracking, wrinkling, fluffing and high springback in the stamping process for dual-phase steel (DP590) used in automotive industry, cupping tests and cone cups experiments of DP590 were conducted at different temperatures. The influence of temperature on Erichsen value (IE) and the value of cone cups were studied, and the formability of DP590 under high temperature was evaluated. The experimental results show that the forming force decreases in a gradient with the rising temperature, however, Erichsen value (IE) has an upward trend which increases slowly below 400 ℃ and rapidly from 600 to 900 ℃, and the value of cone cups reduces gradually. Cupping test process was simulated based on tresca yield criterion. The simulation results match well with the experimental results. The fracture position of part in the process of cupping test is predicted, and the fracture result produced in the cupping test is analyzed as double bulging.

基金项目：

国家自然科学基金资助项目（51165021）

单云（1971-），女，硕士，副教授

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