锻压技术

管坯预弯轴线设计对DP800管件低压液压成形起皱的影响

英文标题：Influence of pre-bending axis design of tube blank on wrinkling in low-pressure hydroforming for DP800 tube

作者：陈智勇

分类号：TG394

出版年,卷(期):页码：2021,46(4):75-80

摘要：

以大径厚比液压成形翼子板支撑构件为研究对象，结合模拟仿真分析，在液压成形工艺参数一定的情况下，研究了不同管坯预弯轴线与零件中心线的偏差值对弯曲起皱的影响，并通过样件调试验证了模拟仿真结果的正确性。研究结果表明：DP800超高强钢车身件在低压液压成形工艺过程中，弯曲内侧轴线压应力与管坯预弯轴线和零件中心线的偏差值呈正相关，偏差值越大，压应力越大；当轴向压应力与材料屈服应力的比值达到1.3时，易导致弯曲内侧失稳起皱；同时，预弯轴线与零件中心线的偏差值越大时，起皱凹陷深度及尺寸轮廓度偏差值也越大。

For the fender support component with large diameter-thickness ratio produced by hydroforming, combined with the simulation analysis, under the condition of certain hydroforming process parameters, the influences of different deviation values between pre-bending axis of tube blank and central line of part on the wrinkling generated during the bending process were studied, and the simulation results were verified by the sample tryout. The results show that during the low-pressure hydroforming process of body parts for DP800 ultra-high strength steel, on the inner side of bending tube, the compressive stress is positively correlated with the deviation between pre-bending axis of tube blank and center line of part. The greater the deviation is, the greater the compressive stress is. When the ratio of axial compressive stress to yield stress of material reaches 1.3, it is easy to cause instability to wrinkle on the inner side of bending tube. At the same time, the greater the deviation between pre-bending axis and central line of part is, the greater the deviation of wrinkle depression depth and size profile is.

基金项目：

陈智勇（1984-），男，硕士，工程师 E-mail：chenzhiyong@baosteel.com

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