锻压技术

6111铝合金温成形数值模拟研究

英文标题：Research on numerical simulation of warm forming for 6111 aluminum alloy

作者：夏建生陈德茂窦沙沙

单位：盐城工学院江苏大学

分类号：TG156.3

出版年,卷(期):页码：2020,45(9):64-68

摘要：

采用CFT-I型多功能材料表面综合性能测试仪，研究板料初始温度、冲压速度及法向载荷对6111铝合金与H13模具钢之间摩擦系数的影响。利用正交实验得出最优工艺参数组合并进行模拟仿真，通过实验验证有限元模拟的可靠性。研究结果表明：摩擦系数随着温度的升高先减小后增大，随着法向载荷的增加而增大，随着冲压速度的增加而减小；冲压成形后，板料法兰区域温度较低，底面部分温度较高；板料的应力、应变分布规律基本相同，主要发生在侧壁、凸模及凹模圆角处。通过模拟仿真与实验测量可知，零件的最大减薄发生在侧壁区域，凸模和凹模圆角处减薄较小，实验与仿真的厚度分布规律基本吻合，验证了有限元模型的有效性。

The influences of initial temperature of sheet, stamping speed and normal load on the friction coefficient between 6111 aluminum alloy and H13 die steel were studied by CFT-I multifunctional material surface comprehensive performance tester. Then, the optimal process parameters obtained by orthogonal experiment were simulated, and the reliability of finite element simulation was verified by experiments. The results show that the friction coefficient decreases first and then increases with the increasing of temperature, increases with the increasing of normal load, and decreases with the increasing of stamping sppeed. After stamping, the temperature of flange area for sheet metal is low, and the temperature of bottom part is higher. However, the distribution law of stress and strain for sheet metal is basically the same, which mainly occurs in the side wall and fillets of punch and die. Through simulation and experimental measurement, it can be seen that the maximum thinning of parts occurs in the side wall area, and the thinning at the fillet of punch and die is small. Furthermore, the distribution law of thickness for experiment and simulation is basically consistent, which verifies the effectiveness of finite element model.

基金项目：

国家自然科学基金资助项目 (51505408)

夏建生（1980-），男，博士，副教授 E-mail：Xiajiansheng@163.com 通讯作者：陈德茂（1994-），男，硕士研究生 E-mail：18252038323@163.com

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