纯钛极薄带微流道刚柔复合模成形工艺  

Rigid-flexible composite mold forming process for ultra-thin strips microchannel of pure titanium

作　　者：张文彬 林鹏[1] ZHANG Wen-bin;LIN Peng(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《塑性工程学报》2024年第7期29-35,共7页Journal of Plasticity Engineering

摘　　要：纯钛因存在延展性和各向异性导致成形性能差,难以成形高深宽比微流道。针对上述问题,提出了纯钛极薄带微流道刚柔复合模成形工艺,以提高纯钛极薄带成形性能,成形更大深宽比、壁厚更均匀的纯钛双极板微流道。通过单向拉伸实验测试了纯钛极薄带力学性能参数,采用刚柔复合模成形工艺研究了纯钛极薄带微流道成形极限,采用光学显微镜对微流道深度、深宽比和壁厚进行了测量分析。结果表明,纯钛极薄带存在显著的各向异性,TD方向r值最大为2.56,选择该方向垂直于微流道进行成形实验;在柔性垫厚度为0.35 mm时,微流道具有最大深宽比为0.53,较传统刚模微流道成形极限提高了26.7%,并显著提高了微流道壁厚分布均匀性。Due to the ductility and anisotropy of pure titanium,the formability is poor which makes it difficult to form high deth-to-width ratio microchannels.Aiming at the above issues,a rigid-flexible composite mold forming process for ultra-thin strip microchannels of pure titanium was proposed to improve the formability of ultra-thin strip of pure titanium and form pure titanium bipolar plate microchannels with larger depth-to-width ratio and more uniform wall thickness.The mechanical property parameters for ultra-thin strip of pure titanium were tested by uniaxial tensile test,and the forming limit of ultra-thin strip of pure titanium microchannels was studied by rigid-flexible composite mold forming process.The depth,depth-to-width ratio and wall thickness of the microchannels were measured and analyzed by optical microscopy.The results show that there is significant anisotropy in ultra-thin strips of pure titanium,with the maximum r-value of 2.56 in the TD direction.Therefore,this direction was chosen perpendicular to the microchannels for forming tests.When the thickness of the flexible pad is 0.35 mm,the maximum depth-to-width ratio of the microchannel is 0.53,the forming limit is 26.7%higher than that of traditional rigid mold microchannels,and the distribution uniformity of the wall thickness of the microchannel is significantly improved.

关 键 词：刚柔复合模成形 微流道 纯钛极薄带 

分 类 号：TG306[金属学及工艺—金属压力加工]