基于Dynaform的新能源地库车顶盖冲压拉深内、外拉延筋间距的数字化设计技术

Digital design technology for inner and outer drawbead spacing in stamping and drawing for roof cover of new energy underground parking garage vehicle based on Dynaform

采用非线性有限元软件Dynaform,在相同的冲压工艺条件下,对不同内、外拉延筋间距时新能源地库车D6176顶盖的冲压拉深过程进行了数值模拟,并通过对成形极限图、厚薄变化云图、“光斑”大小及分布的研究,最终确定该地库车顶盖冲压拉深的内、外拉延筋间距的合理范围为20~40 mm,其中40 mm为相对最优间距,并通过了生产验证。同时研究发现,在内、外拉延筋间距为20~30 mm时,“光斑”随间距的增大而增多;内、外拉延筋间距为30~40 mm时,“光斑”随间距的增大而减少。在20~40 mm范围内,最大“斑点”随内、外拉延筋间距的增大呈下降趋势,且在20~30 mm范围内下降速率较大,在30~40mm范围内下降速率较小。

Using nonlinear finite element software Dynaform,under the same stamping process conditions,the stamping and drawing process of roof cover for new energy underground parking garage vehicle D6176 was numerically simulated with different inner and outer drawbead spacing,and through the study of forming limit diagram,cloud diagram of thickness change,and size and distribution of“light spots”,it was finally determined that the reasonable range of inner and outer drawbead spacing in the stamping and drawing for the roof cover of underground parking garage vehicle was 20-40 mm,of which 40 mm was the relatively optimal spacing.Then,the production verification was passed.And the study finds that when the inner and outer drawbead spacing is 20-30 mm,the“light spot”increases with the increasing of spacing,and when it is 30-40 mm,the“light spot”decreases with the increasing of spacing.In the range of 20-40 mm,the maximum“light spot”shows a downward trend with the increasing of the inner and outer drawbead spacing,and the decrease rate is relatively large within 20-30 mm,and the decrease rate is relatively small within 30-40 mm.