金属双极板冲压成形数值分析及回弹补偿

Numerical analysis and springback compensation of metal bipolar plate stamping forming

针对小型风冷电堆金属阳极板冲压成形的质量缺陷问题,运用Autoform软件对双极板冲压成形工艺进行了仿真分析,研究了压边力、冲压速度、模具间隙和摩擦因数对成形质量的影响。以最大减薄率和回弹量为优化目标开展了正交试验,得出了对成形质量影响最大的因素为压边力,而冲压速度对成形质量的影响最小。在此基础上,确定了最优工艺参数组合:压边力为80 kN,冲压速度为400 mm·s^(-1),模具间隙为0.15 mm,摩擦因数为0.15。结果表明,优化后的最大回弹量为1.487 mm,相较优化前减小了1.416 mm。最后,基于Autoform软件,对双极板进行了模面回弹补偿,发现回弹补偿后最大回弹量减小了41.2%。通过试验验证了仿真的可靠性。

Aiming at the quality defect problems of stamping forming of metal anode plates for small wind-cooled fuel cell stacks,Autoform software was used to simulate and analyze the stamping forming process of bipolar plates,and the effects of blank holder force,stamping velocity,die clearance and friction factor on forming quality were studied.The maximum thinning rate and springback were taken as the optimization objectives to carry out the orthogonal tests,and it is found that the blank holder force is the most influential factor on forming quality,while the effect of stamping velocity on forming quality is the smallest.Based on this,the optimal process parameter combination was determined:blank holder force of 80 kN,stamping velocity of 400 mm·s^(-1),die clearance of 0.15 mm and friction factor of 0.15.The results show that the maximum springback is 1.487 mm after optimization,and it is reduced by 1.416 mm compared with that before optimization.Finally,based on Autoform software,surface springback compensation was performed on the bipolar plates.It is found that the maximum springback is reduced by 41.2%after springback compensation.The reliability of simulation was verified by test.