下压量对微型燃料电池双极板成形性能的影响

Impacts of Press Amount on Forming Property of Micro Fuel Cell Bipolar Plate

双极板是微型燃料电池关键部件之一,微尺度下的高精度极板流道给其成形带来了难度,针对双极板这一特点提出了累积成形方法。在介绍微累积成形工作原理的基础上搭建了相应的实验装置,分别选取0.165mm和0.27mm板厚的成形区域9mm×9mm铝合金板作为双极板毛坯,进行了累积成形实验,分析双极板成形规律,研究了不同下压量对成形力的影响,并且比较了不同下压量时的最大成形力。结果显示,不同厚度的板料随着下压量的增加,成形力在累积成形起始点达到最大,然后成形力先减小后增大,在终点处接近最大成形力;最大成形力随着下压量、板料厚度的增加而增加,0.27mm板料下压0.5倍板厚时的最大成形力大于0.165mm板料下压2倍板厚时的最大成形力。

The bipolar plate is a key component of micro fuel cell. It is difficult to form the high precision flow channel of bipolar plate under the micro scale. Herein, an accumulative forming method for the characteristics of bipolar plate was presented. On the basis of introducing the principles of microaccumulation forming, we set up the corresponding experimental apparatus, selecting 9mm× 9mm×0. 165mm and 9mm×9mm×0.27mm aluminum plate as the bipolar plate blanks to do the ac- cumulated forming test. We analyzed the shaping law and the influence of different amount of underdraught on the forming force, comparing the maximum forming force under different amount of underdraught. The results show that the plates with different thickness present the same law of forming force,the forming force reaches maximum at the starting point as increasing the amount of under- draught, then the forming force decreases firstly and then increases, at last reaches the vicinity of the maximum forming force at the end of flow channel. The bigger the amount of underdraught and the thickness of plates,the greater the maximum forming force. The maximum forming force of 0. 27mm sheet plate with the underdraught of 0.5 times thickness is greater than that of 0. 165mm sheet plate with the underdraught of 2 times thickness.