锻压技术

基于AUTOFORM的汽车顶棚冲压回弹评估及补偿研究

英文标题：Research on evaluation and compensation of stamping springback for automobile roof based on AUTOFORM

作者：孔敏胡伟莫健华杨卫红刘晖晖

分类号：TG386

出版年,卷(期):页码：2019,44(8):41-48

摘要：

针对拉延件冲压成形时现场与模拟回弹数据偏差较大的难题，以某车型顶棚为研究对象，通过对该零件的工艺分析，提出在前期模拟分析时计算每工序应力释放回弹及拉延后每工序压料体闭合产生附加变形引起的新的回弹，准确地模拟评估回弹量；同时，提出在补偿策略中引入符形补偿的方法。采用优化后的补偿策略进行回弹补偿，基于补偿数据进行实验验证。结果表明：现场无需修模，尺寸精度合格，有效地解决了顶棚零件的回弹不稳定难题；实验与模拟预测结果基本吻合，最大误差仅为0.1 mm。说明所提出的方法对提高CAE模拟真实性、提高逆向补偿精度、减小现场修模次数具有重要的指导意义。

For the problem of large springback deviation between measuring data and simulation data in stamping process of drawing parts, taking the automobile roof as the research object, through the process analysis of the part, it was proposed to calculate the springback of each process stress release and the new springback of each process after drawing caused by closing the press body to produce the additional deformation during the presimulation analysis, and the amount of springback was simulated and evaluated accurately. At the same time, introducing symbolic compensation method in compensation strategy was proposed. Then, the springback compensation was achieved by the optimized compensation strategy, and the experimental verification was carried out based on the compensation data. The results show that the problem of springback instability of roof parts is effectively solved without modifying the die in the production site, and the dimensional auuracy is qualified. The experiment and simulation prediction results are consitent, and the maximum error is only 0.1 mm. It shows that the method proposed has important guiding significance for improving the authenticity of CAE simulation, improving the accuracy of reverse compensation and reducing the number of times for die repairing in the production site.

基金项目：

2018年度湖北省教育厅科学研究计划(B2018333)

作者简介：孔敏（1991-），女，硕士，助教 E-mail：13207131768@163.com 通讯作者：胡伟（1990-），男，学士 E-mail：782802298@qq.com

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