锻压技术

汽车外覆盖件冲压表面畸变预测与模面补偿研究

英文标题：Research on prediction of stamping surface defects and die surface compensation for automobile exterior panel

作者：武永甫

单位：上海大众汽车

分类号：TG386.41

出版年,卷(期):页码：2014,39(12):101-105

摘要：

汽车外覆盖件在冲压成形回弹阶段经常产生局部凹陷，其深度在几十至几百微米，对整车的外观质量有很大的影响，尤其是车门把手附近的表面凹陷，在试模阶段需要耗费很长的时间改善表面质量。以某车型的前门外板为研究对象，基于Autoform软件对前门外板的成形阶段进行了有限元仿真，预测结果与现场油石打磨效果基本一致，证明了仿真能够很好地预测门把手附近的表面畸变。通过改变模面的有限元模型节点，采用二维曲线和三维曲面方法研究了模面补偿对门把手区域表面畸变的影响程度。结果表明，通过模面补偿能够有效地减小面畸变发生的严重程度和区域大小。

Local surface defects frequently occur in the springback stage after stamping for automobile exterior panel, the depth of which is ranging from dozens of micron to hundreds of micron, and have a profound influence on the exterior quality of the whole automobile. It always takes huge amount of time to improve the surface quality at the tryout stage especially the local surface defects around the door handle. FEM simulation of front exterior door at the drawing stage was conducted using Autoform software. The predicted results were in good agreement with the whetstone grinding. Predicting the surface local defects around the door handle could be well realized by simulation. The influence of die surface compensation on the local surface defects around the door handle was studied by changing the nodes of the die surface and applying both two-dimension curvature and three-dimension surface methods. Results show that the area size and the severity of local defects can be effectively decreased by die surface compensation.

基金项目：

武永甫（1986-），男，硕士,助理工程师

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