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 But, when the thickness value of thicker side is fixed, the principle is no longer applicable.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

参考文献：

［1］Saunders F I, Wagoner R H. Forming of tailor-welded blanks[J]. Metallurgical and Materials transactions A, 1996, 27(9): 2605-2616.
［2］Chan S M, Chan L C, Lee T C. Tailor-welded blanks of different thickness ratios effects on forming limit diagrams [J]. Journal of Materials Processing Technology, 2003, 132(1): 95-101.
［3］Scriven P J, Brandon J A, Williams N T. Influence of weld orientation on forming limit diagram of similar/dissimilar thickness laser welded joints[J]. Ironmaking & Steelmaking, 1996, 23(2): 177-183.
［4］童正国，田浩彬，林建平，等.直线焊缝差厚拼焊板的成形规律[J].机械工程学报，2008，44(5)：215-219.Tong Z G, Tian H B, Lin J P, et al. Formability Principles of linear-weld-line tailor-weld blanks (TWBs) with different thickness ratios[J]. Chinese Journal of Mechanical Engineering, 2008, 44(5): 215-219.
［5］郝长岭，周贤宾.拼焊板成形极限研究进展[J].锻压技术，2006，31(3)：19-22.Hao C L, Zhou X B. Investigation on forming limit of tailor-welded blanks[J]. Forging & Stamping Technology, 2006, 31(3): 19-22.
［6］GB/T 15825.8—2008, 金属薄板成形性能与试验方法第8部分:成形极限图(FLD)测定指南[S].GB/T 15825.8—2008, Sheet metal formability and test methods Part 8: Guidelines for the determination of forming-limit diagrams [S].
［7］王秀凤，郎利辉.板料成形CAE设计及应用[M].北京：北京航空航天大学出版社，2008.Wang X F, Lang L H. Sheet Metal Forming CAE Design and Application [M]. Beijing: Beihang University Press, 2008.
［8］薛松，周杰，何应强.差厚拼焊板成形性的单向拉伸试验[J].锻压技术，2011，36(2)：30-33.Xue S, Zhou J, He Y Q. Formability tensile test of different gauge tailor-welded blanks[J]. Forging & Stamping Technology, 2011, 36(2): 30-33.
［9］孙东继，林建平，邢丹英，等.拼焊板母材性能参数与其板厚匹配关系研究[J].系统仿真学报，2011，23(6)：1113-1118.Sun D J, Lin J P, Xing D Y, et al. Study on matching relation between material properties and thickness of base metals in tailor-welded blank[J]. Journal of System Simulation, 2011, 23(6): 1113-1118.
［10］童正国，田浩彬，林建平，等.轿车拼焊板板厚对胀形成形的影响[J].锻压技术，2005，30（S0）：55-58.Tong Z G, Tian H B, Lin J P, et al. Study of formability of TWBs on different thickness[J].Forging & Stamping Technology, 2005, 30(S0): 55-58.
［11］陈炜，杨继昌，林忠钦.拼焊板覆盖件成形过程中的焊缝移动和成形性能[J].机械工程学报，2004，40(9)：62-66.Chen W, Yang J C, Lin Z Q. Weld-line movement and formability of tailor-welded blanks during forming automobile panels[J]. Chinese Journal of Mechanical Engineering, 2004, 40(9): 62-66.
［12］Panda S K, Ravi Kumar D. Experimental and numerical studies on the forming behavior of tailor welded steel sheets in biaxial stretch forming[J]. Materials & Design, 2010, 31(3): 1365-1383.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】