阵列微流道电场辅助辊压成形技术研究

提出了电场辅助辊压成形制备大面积阵列微流道结构的工艺方法，修正了传统辊压理论模型，发现增大辊半径和辊齿间隙与齿宽之比可以提高填充高度。通过建立阵列微流道电流辅助热-电-力耦合有限元仿真模型确定了“板对板”通电方式以及辊压工艺方案，开展了不同工艺参数下电场辅助SUS304不锈钢阵列微流道辊压成形试验。结果表明，在辊压成形过程中，板材表面温度分布均匀，但板材横截面电流密度分布不一致，导致微流道不同区域应力分布不同，高密度电流可以降低流动应力的大小且减弱微流道不同区域应力的差异。在工艺参数方面，适当增大辊压力可以提高微流道成形质量，较低的同步辊速有利于微流道的成形。在最佳工艺参数组合下制造出的微流道平均宽度为0.302 mm±0.011 mm，平均深度为0.362 mm±0.010 mm。

Research on Arrayed Micro-channel Electric Field Assisted Roll Forming Technology

An electric field assisted roll forming technique was proposed to fabricate large area arrayed micro-channel structure, and the traditional theoretical model of roll pressure was modified. It was found that the filling height could be improved by increasing the radius of roller and the ratio of the gap to the tooth width. By establishing the arrayed micro-channel current assisted thermo-electro-mechanical coupling finite element simulation model, the “plate to plate” electrically-assisted rolling process scheme was determined, and the experiments of SUS304 stainless steel arrayed micro-channel electrically-assisted roll forming were performed. The results show that the surface temperature distribution of sheet is uniform, but the current density distribution of sheet cross section is inconsistent, which leads to the uneven distribution of stress in different regions of micro-channel. The high current density can reduce the flow stress and weaken the difference of stress in different regions of micro-channel. In terms of process parameters, increasing roll pressure can improve the forming quality of micro-channel, and lower synchronous roller speed is beneficial to the forming of micro-channel. The average width and depth of the micro-channel fabricated under the optimal process parameters are 0.302 mm±0.011 mm and 0.362 mm±0.010 mm respectively.