Kinematics and trajectory analysis of the fixed abrasive lapping process in machining of interdigitated micro-channels on bipolar plates
Kinematics and trajectory analysis of the fixed abrasive lapping process in machining of interdigitated micro-channels on bipolar plates
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DOI：
10.1016/j.precisioneng.2015.12.005
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发表时间：
2016-04-01
影响因子：
3.6
通讯作者：
Li, Gang
中科院分区：
文献类型：
--
作者：
Wen, Donghui;Qi, Huan;Li, Gang
研究了固定磨料研磨加工质子交换膜燃料电池双极板叉指型微通道的能力和精度。建立了描述固结磨料研磨盘与工件之间相对运动的运动学方程，并分别对单个金刚石磨料和17种不同排列方式的固结磨料研磨盘的运动轨迹进行了数值模拟。结果表明，当转速比为有理数时，研磨轨迹可以周期性叠加。通过对研磨轨迹均匀性和双极板开孔率的评价，得到了最佳的旋转比为1：1，并得到了固定金刚石磨料在研磨板上的最佳排列形式为C4排列形式。然后，进行了一组固定磨料研磨试验，以探讨其在双极板上的叉指微通道的加工能力。研究发现，对于本研究中所考虑的铜和不锈钢样品，采用较大的研磨压力和较高的转速可以获得较大的材料去除率。通过测试具有双极板的单个微型燃料电池的性能，发现最大电池功率密度为约165 mW cm（-2），双极板的特征在于具有良好的电池性能的叉指型微通道。(C)2015 Elsevier Inc. All rights reserved.
The fixed abrasive lapping process is presented to investigate its ability and accuracy in machining of interdigitated micro-channels on bipolar plates that are used in the proton exchange membrane fuel cell. A kinematical equation to describing the relative movement between the fixed abrasive lapping plate and workpiece is developed and used to numerically simulate the trajectories of a single diamond abrasive and fixed diamond abrasives with 17 different arraying forms, respectively. It is shown that the lapping trajectory can be superposed periodically when the rotation ratio is a rational number. By assessing the uniformity of lapping trajectories and opening ratio of the bipolar plate the optimized rotation ratio is obtained which is 1:1, and the best arraying form of the fixed diamond abrasives on the lapping plate has been obtained as well that is the arraying form of C4. Then, a set of fixed abrasive lapping tests were conducted to explore its ability in machining of interdigitated micro-channels on bipolar plates. It is found that larger material removal rate can be achieved by employing bigger lapping pressure and higher rotation speed for both copper and stainless steel samples considered in this study. The maximum cell power density is found to be about 165 mW cm(-2) by testing the performance of a single micro fuel cell with a bipolar plate characterized by interdigitated micro-channels that shows a good cell performance. (C) 2015 Elsevier Inc. All rights reserved.