锻压技术

母材板厚差异对直线焊缝拼焊板成形能力的影响规律

英文标题：Influence principles of formability for linear-weld-line tailor-weld blanks with different thicknesses of base metals

作者：甘勇王瀚超伍建伟李宏钊

单位：桂林电子科技大学

关键词：胀形实验数值模拟板厚差异成形能力

分类号：TG386

出版年,卷(期):页码：2014,39(8):119-124

摘要：

通过Dynaform数值模拟仿真技术，在验证了仿真模型可靠性的基础上，对同材差厚拼焊板的胀形过程进行了研究。在板料胀形过程中，分析了两侧母材厚度变化对极限成形高度、最大焊缝移动量及应变分布的影响，并运用遗传算法（GA）对仿真数据进行拟合，获得了母材厚度与极限成形高度、最大焊缝移动量之间的数学关系式。利用MATLAB的GUIDE模块设计人机交互界面。研究表明：在固定薄侧母材厚度时，拼焊板极限成形高度与板厚比成负相关关系，最大焊缝移动量与板厚比成正相关关系；但在固定厚侧母材厚度时，这些规律已不再适用，此时薄侧板厚和平均板厚对成形有很大影响。此外，随着板厚比的增大，应力集中在薄侧，且破裂位置逐渐向焊缝处靠近，当板厚比超过1.7后，成形过程变得不稳定。因此在拼焊板成形过程中应合理选择板厚搭配，进而提高拼焊板的成形能力。

After using Dynaform numerical simulation techniques, on the basis of reliability of simulation model verified, Dome test of the same material tailor welded blanks with different thicknesses was carried out. During the Dome test of blanks, the influence of both sides of base metal with different thicknesses on limiting dome height, the maximum weld-line movement and strain distribution was analyzed. And using the genetic algorithm to fit the experimental data, the mathematical expressions between the changing thickness of base metal and limiting dome height, the maximum weld-line movement were proposed. Using the GUIDE module of MATLAB, the human-computer interaction interface was built. Studies show that there is a negative correlation between limit forming height and thickness ratio, while there is a positive correlation between the maximum weld-line movement and thickness ratio when the thinner side thickness value is fixed. But, when the thickness value of thicker side is fixed, the principle is no longer applicable. At this point, the thickness of thinner side and the average thickness have a great influence on the forming process. In addition, with the increasing of thickness ratio, the stress focuses on the thinner side, and the fracture location shifts towards the weld. When the thickness ratio is above 1.7, the forming process gets instable. Therefore, the thickness of tailor-weld blanks (TWBs) should be chosen reasonably to improve their forming ability.

基金项目：

广西自然科学基金项目（2013GXNSFAA019298）

甘勇（1973-），男，博士，教授；王瀚超（1989-），男，硕士研究生

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