锻压技术

先进高强钢U型件链模成形缺陷机理分析及影响因素研究

英文标题：Research on defect mechanism and influential factors in chain-die forming for U-shaped part of advanced high strength steel

作者：李亚光李大永丁士超肖华石磊

单位：上海交通大学宁波赛乐福板材成型技术有限公司宝山钢铁股份有限公司汽车用钢开发与应用技术国家重点实验室（宝钢）

关键词：链模成形先进高强钢冗余变形 U型件 Chaboche模型正交试验

分类号：TG331

出版年,卷(期):页码：2019,44(7):62-71

摘要：

为了研究链模成形工艺常见缺陷的产生机理及其影响因素，以先进高强钢等截面U型件为研究对象，对链模工艺成形过程进行分析，揭示了成形中同一截面上不同位置处板料的变形路径差异是引起纵向拉压冗余变形的原因，过多的冗余变形导致了U型件翼缘边波、腹板翘曲、端部张口和回弹量大等产品缺陷的产生。利用QP1180先进高强钢的Chaboche混合硬化模型，建立了有限元模型，并结合正交试验方法进行了成形缺陷的影响因素分析。分析中以U型件纵向中心线的平直度、翼缘边缘的平直度、U型件两端截面形状和中间截面的回弹角，分别评估了腹板的翘曲程度、边波缺陷、张口缺陷，以及整体回弹程度，为该工艺在汽车零件制造中的应用提供借鉴。

In order to explore the mechanism of common defects and the influence factors in chain-die forming for a U-shaped part with equal cross section of advanced high strength steel (AHSS), the process of chain-die forming was analyzed. It is revealed that the deformation path difference at different positions on the same cross section of sheet in the forming is the main cause of the longitudinal tension-compression redundant deformation, and the excessive redundant deformation leads to product defects such as U-shaped flange edge wave, web warpage, end flare and large springback. Then, a finite element model was established by employing the Chaboche mixed hardening model of QP1180 AHSS, and the influential factors on product defects were analyzed by the orthogonal experiment. In the analysis of the U-shaped part, the web warpage, the edge wave defect, the end flare defect and the overall degree of springback were evaluated respectively by the straightness of its longitudinal centerline, the straightness of its flange edge, the cross-sectional shape of its ends and the springback angle of its middle cross section. It provides an effective guideline for the application of this technology in the manufacture of automobile parts.

基金项目：

国家自然科学基金资助项目（U1860110）

李亚光（1990-），男，博士研究生，E-mail：lyg@sjtu.edu.cn；通讯作者：李大永（1973-），男，博士，教授，E-mail：dyli@sjtu.edu.cn

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