多点渐进成形工艺数值模拟及实验对比

Numerical simulation and experimental validation of multi-point incremental forming technology

针对成形大尺寸船板需要大设备的问题,以多点渐进成形方法为研究对象,该方法既有单点渐进成形的由局部变形累计成总体变形的特点,又有多点成形模具自由重构的特点。采用数值模拟法仿真了4种不同的成形工艺产生的成形效果,同时展开了相同工况的实验研究,将实验结果在三维扫描仪下进行测量,然后对比验证了数值模拟的仿真结果。研究结果表明:对于双曲率船板而言,两侧多点同步驱动的成形方案比一侧先调整好位置、另外一侧再依次驱动的方案要优越,成形路径对成形效果的影响不太明显,压头的驱动方式对成形力的历史变化影响显著。

The large plate requires to be formed by large size forming equipment,and the multi-point forming has the characteristics of both accumulated forming effect from the single point incremental forming and free reconstruction of multi-point forming die.Then,the forming effects were simulated numerically by four different forming technologies,and the experimental researches were carried out.Furthermore,the experimental results were scanned by a 3D laser scanner and compared with simulated results.The results indicate that the forming method by moving both side pins together is better than that by first adjusting one side pin position and then moving it for a doublecurvature plate.The influence of the forming path on the forming effect is unobvious,but the gradual changes of forming force are greatly affected by the driving model of pins.