提高汽车拉延模具与零件贴合率的型面补偿方法及应用

Surface compensation method and application for improving fit rate of automobile drawing dies and parts

针对汽车覆盖件拉延模具开发中研配周期长的问题,提出一种基于零件厚度变化和凸、凹模变形的模具型面补偿方法,以提高拉延模具试模中模面和零件的贴合率。首先,采用冲压成形软件对拉延工艺进行数值模拟,得到成形载荷和成形后零件的厚度变化情况;然后,将拉延成形分析得到的最大载荷信息映射到划分网格的三维实体模型中对模具进行静力分析,得到模具的变形位移;最后,借助ThinkDesign软件的GSM模块,依次用模具变形位移和厚度变化位移对模具型面进行补偿。并以汽车前隔板拉延模具为研究对象,进行模具型面补偿和实验验证,结果表明该方法可有效地提高拉延模具首次试模的贴合率。

For the problem of long research and development cycle in the development of drawing die for automobile cover panels, a die surface compensation method was proposed based on the variation of part thickness and the deformations of punch and die, so as to improve the fit rate of die surface and part in the drawing die trial. Firstly, the numerically simulation of drawing process was carried out by the stamping software, and the change of forming load and thickness of formed part were obtained. Secondly, the maximum load information obtained by the drawing analysis was mapped to the three-dimensional solid model which was divided into meshes, and the static analysis of die was performed to obtain the deformation displacement of die. Finally, with the help of the global shape modeling(GSM) module for software ThinkDesign, the die surface was compensated by the die deformation displacement and the thickness change displacement in turn. Furthermore, for the drawing die of automobile front bulkhead, the die surface compensation and the experimental verification were carried out. The results show that the proposed method can effectively improve the fit rate of drawing die in the first die trial.