冲压件腹面断面结构对冲压成形速度的敏感度分析

发布时间：2019-03-23 16:16

【摘要】：为研究冲压速度对产品成形性的影响,利用非线性有限元软件MARC对不同断面结构冲压件成形性进行分析。考虑到腹面水平结构冲压件在与模具接触瞬间所受冲击力均匀分布且变化不大,以复杂腹面断面结构冲压件作为研究对象,将凸起幅值、凸起占比以及凸起偏心距作为腹面断面结构表征指标,构建不同的腹面断面结构模型,通过对不同冲压速度和断面结构下坯料的偏斜量以及畸变网格数的分析,得出如下结论:凸起占比越小、冲压速度越快,料片在成形过程中偏斜量越大,但料片偏斜量的峰值均未出现在凸起占比极小的范围内;在没有压料的情况下,由凸起偏心距引起的畸变网格数目增加不明显,而有压料的情况下,偏心距对畸变网格数影响较大。
[Abstract]:In order to study the influence of stamping speed on the formability of products, the formability of stamping parts with different cross-section structures was analyzed by using the nonlinear finite element software MARC. Considering the uniform distribution and little change of the impact force on the web horizontal structure stamping parts at the moment of contact with the die, the bulge amplitude of the stamping parts with complex web cross section structure is taken as the research object and the bulge amplitude will be taken as the research object. The ratio of the bulge and the eccentricity of the bulge are taken as the index of the web section structure, and different web section structure models are constructed. The deflection and distortion grid number of the billet under different stamping speed and section structure are analyzed by means of the analysis of the deflection and the distortion grid number of the billet under different stamping speed and cross section structure. The conclusions are as follows: the smaller the bulge ratio is, the faster the stamping speed is, the larger the deflection amount of the sheet is in the forming process, but the peak value of the slant quantity does not appear in the very small range of the bulge ratio; In the case of no pressing, the number of distorted meshes caused by raised eccentricity is not obviously increased, but in the case of pressed materials, the eccentricity has a greater effect on the number of distorted meshes.
【作者单位】：西安航空学院车辆工程学院;东风汽车公司技术中心;保利佳新材料有限公司;上海通用东岳汽车有限公司;
【基金】：国家自然科学基金资助项目(61374196,51178053) 陕西省工业科技攻关项目(2015GY053)
【分类号】：TG386

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