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采用顺序耦合的方法建立了交叉筋壁板激光弯曲成形的有限元模型,对壁板成形过程中的温度场和应变场进行分析,提出一种变功率扫描策略来减小壁板的非期望变形。结果显示,恒参数扫描时交叉筋壁板不仅发生横向弯曲,还发生纵向弯曲,并且扫描线上的蒙皮发生下凹。分析表明,蒙皮的下凹是由横向弯曲变形不一致导致的,纵向弯曲是由纵向塑性压应变导致的;采用提出的变功率扫描策略可以有效减小壁板的非期望变形,将蒙皮的最大下陷量和自由端的相对弯曲程度分别减小了80%和58%。
The method of sequential coupling was used to establish the finite element model of the laser bending of the cross-ribbed slab. The temperature field and strain field during the forming of the slab were analyzed. A variable-power scanning strategy was proposed to reduce the undesired deformation of the slab . The results show that in the constant parameter scanning, the cross ribs tend to not only bend transversely but also longitudinally, and the skin on the scan line is concave. The analysis shows that the undercut of the skin is caused by the inconsistency of the transverse bending deformation. The longitudinal bending is caused by the longitudinal plastic compressive strain. The proposed variable power scanning strategy can effectively reduce the undesired deformation of the panel, The maximum sag and the relative bending of the free ends were reduced by 80% and 58% respectively.