外载荷对激光弯曲成形影响的数值研究

摘要

为了研究外载荷对板材激光弯曲成形的影响,建立三种数值模拟工况:无外载荷作用下的激光弯曲成形、外载荷协同作用下的激光弯曲成形和外载荷作用后的激光弯曲成形,并采用顺序热应力耦合分析技术进行数值模拟.首先对板材模型进行传热分析获得瞬态温度场,然后将其导入三种模拟工况进行位移场的准静态分析.结果表明:施加朝向激光束工作面的弯矩能够有效提高板材的弯曲程度,其中外载荷作用后的模拟工况提高的效果最为显著;施加背向激光束工作面的弯矩会使板材发生反向弯曲,并在激光束终点的位置产生位移场的边界效应.%To study the effects of external load on laser bending,three numerical simulation cases were created:laser bending without external load,laser bending with external load and laser bending after external load.Sequentially cou-pled thermal stress analysis was used to simulate the process of laser bending.The transient temperature field was ob-tained by heat transfer analysis,and it was imported into three simulation cases and the quasi-static analysis of dis-placement field was carried out.The results show that the bending moment which is toward the laser beam can increase the bent angle of the plate,and the bend angle was improved more significantly under the case of laser bending after external load.The reverse bending of the plate can be caused by the bending moment which is opposite to the laser beam,and the edge effect of displacement field at the end position of laser beam can be produced.