PEMFC金属双极板冲压成形数值模拟与实验
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摘要
目的研究金属双极板冲压成形过程中各工艺参数和模具结构参数对成形质量的影响。方法采用Dynaform有限元分析软件对SS304双通道蛇形流道双极板冲压成形过程进行模拟。研究模具圆角半径、模具锥度、压边力、拉延筋等因素对双极板成形质量的影响。结果增加模具圆角半径和模具锥度可防止双极板破裂。适当增大压边力能有效消除起皱缺陷,设置拉延筋能有效改善坯料流动情况,必要时需设置多重拉延筋使零件成形完全。当模具圆角半径为0.25 mm,模具锥度为0°,拉伸深度为0.5 mm,压边力大小为60 kN,并采用双重拉延筋的情况下,所成形的金属双极板质量良好,无破裂、起皱、成形不足等缺陷。结论模拟结果与实验结果一致,验证了模拟结果的正确性,可见采用冲压工艺成形金属双极板是可行的。
The work aims to study influences of process parameters and mold structure parameters on quality of metal bipolar plate during stamping forming, the stamping forming process of 304 bipolar plate with double channel serpentine flow fields was simulated by Dynaform. The effects of fillet radius, die taper, blank holder force, draw bead, etc. on the forming quality of the bipolar plate were studied. Increasing the fillet radius and mold taper could prevent the bipolar plate from cracking. Increasing the blank holder force appropriately could eliminate the wrinkle defects effectively. Provision of draw bead could improve the flow situation of billet. If necessary, more multiple draw beads might be set to make parts formed completely. With die radius of 0.25 mm, mold taper of 0°, the drawing depth of 0.5 mm, the blank holder force of 60 kN, and double drawbeads, the quality of the metal bipolar plate was good. It was free from rupture, wrinkling, lack of forming and other defects. The results of simulation and experiment are well coincident. It proves the validity of the numerical simulation. It can be seen that the use of stamping process in forming metal bipolar plate is feasible.
The work aims to study influences of process parameters and mold structure parameters on quality of metal bipolar plate during stamping forming, the stamping forming process of 304 bipolar plate with double channel serpentine flow fields was simulated by Dynaform. The effects of fillet radius, die taper, blank holder force, draw bead, etc. on the forming quality of the bipolar plate were studied. Increasing the fillet radius and mold taper could prevent the bipolar plate from cracking. Increasing the blank holder force appropriately could eliminate the wrinkle defects effectively. Provision of draw bead could improve the flow situation of billet. If necessary, more multiple draw beads might be set to make parts formed completely. With die radius of 0.25 mm, mold taper of 0°, the drawing depth of 0.5 mm, the blank holder force of 60 kN, and double drawbeads, the quality of the metal bipolar plate was good. It was free from rupture, wrinkling, lack of forming and other defects. The results of simulation and experiment are well coincident. It proves the validity of the numerical simulation. It can be seen that the use of stamping process in forming metal bipolar plate is feasible.
引文
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[11]陈涛,乔运乾,李昌平,等.蛇形流场结构质子交换膜燃料电池的性能研究[J].可再生能源,2012,30(3):87—91.CHEN Tao,QIAO Yun-qian,LI Chang-ping,et al.Research on Performance of Serpentine Flow Field in PEMFC[J].Renewable Energy,2012,30(3):87—91.
[12]柯旭贵.冲压工艺与模具设计[M].北京:机械工业出版社,2012.KE Xu-gui.Stamping Process and Mold Design[M].Beijing:China Machine Press,2012.
[13]刘细芬.基于dynaform的汽车覆盖件拉延成形有限元模拟分析[J].机械研究与应用,2013,26(2):33—35.LIU Xi-fen.Finite Element Simulation Analysis of Drawing Process for Auto Panel Based on Dynaform[J].Mechanical Research&Application,2013,26(2):33—35.
[2]LIU Y X,HUA L.Fabrication of Metallic Bipolar Plate for Proton Exchange Membrane Fuel Cells by Rubber Pad Forming[J].Journal of Power Sources,2010,195(11):3529—3535.
[3]TSAI P S,WANG L S,CHANG F R.Modeling and Hierarchical Tracking Control of Tri-wheeled Mobile Robots[J].IEEE Transaction on Robotics,2006,22(5):1055—1062.
[4]许桢英,张园园,王匀,等.微型燃料电池双极板成形工艺的研究进展[J].电源技术,2015(4):861—863.XU Zhen-ying,ZHANG Yuan-yuan,WANG Yun,et al.Research Progress of Forming Process of Bipolar Plate for Micro Fuel Cell[J].Chinese Journal of Power Sources,2015(4):861—863.
[5]SASAWAT M,OMER N C,MUAMMER K.Effect of Manufacturing Processes on Formability and Surface Topography of Proton Exchange Membrane Fuel Cell Metallic Bipolar Plates[J].Journal of Power Sources,2010,195(16):5269—5277.
[6]KWON H J,JEON Y P,KANG C G.Effect of Progressive Forming Process and Processing Variables on the Formability of Aluminum Bipolar Plate with Microchannel[J].The International Journal of Advanced Manufacturing Technology,2013,64(5):681—694.
[7]刘艳雄.燃料电池金属双极板软模成形研究[D].武汉:武汉理工大学,2010.LIU Yan-xiong.Study on the Phubber Pad Forming Process of the Metal Bipolar Plate for Fuel Cell[D].Wuhan:Wuhan University of Technology,2010.
[8]LIM S S,KIM Y T,KANG C G.Fabrication of Aluminum 1050 Micro-channel Proton Exchange Membrane Fuel Cell Bipolar Plate Using Rubber-pad-forming Process[J].The International Journal of Advanced Manufacturing Technology,2013,65(1):231—238.
[9]张金营,宋满仓,吕晶,等.PEMFC金属双极板成形工艺分析及数值模拟[J].模具工业,2010,36(12):18—21.ZHANG Jin-ying,SONG Man-cang,LYU Jing,et al.Forming Process and Numerical Simulation for Metal Bipolar Plate of PEMFC[J].Die&Mould Industry,2010,36(12):18—21.
[10]李茂春,张连洪,万淑敏,等.PEMFC薄金属流场板冲压成形有限元模拟[J].电源技术,2005,29(8):502—504.LI Mao-chun,ZHANG Lian-hong,WAN Shu-min,et al.Finite Element Simulation of Forming Process for Thin Metallic Flow Field Plate of Proton Exchange Membrane Fuel Cell(PEMFC)[J].Chinese Journal of Power Sources,2005,29(8):502—504.
[11]陈涛,乔运乾,李昌平,等.蛇形流场结构质子交换膜燃料电池的性能研究[J].可再生能源,2012,30(3):87—91.CHEN Tao,QIAO Yun-qian,LI Chang-ping,et al.Research on Performance of Serpentine Flow Field in PEMFC[J].Renewable Energy,2012,30(3):87—91.
[12]柯旭贵.冲压工艺与模具设计[M].北京:机械工业出版社,2012.KE Xu-gui.Stamping Process and Mold Design[M].Beijing:China Machine Press,2012.
[13]刘细芬.基于dynaform的汽车覆盖件拉延成形有限元模拟分析[J].机械研究与应用,2013,26(2):33—35.LIU Xi-fen.Finite Element Simulation Analysis of Drawing Process for Auto Panel Based on Dynaform[J].Mechanical Research&Application,2013,26(2):33—35.