TA2纯钛薄板微流道液压成形工艺研究

doi:10.19562/j.chinasae.qcgc.2024.08.017

摘要/Abstract

摘要：

双极板是氢燃料电池的重要部件之一，钛作为金属双极板基材有诸多优势，但钛的成形性能差、回弹较为严重，本文以0.1 mm TA2纯钛薄板微流道液压成形为研究对象，通过试验和有限元模拟相结合的方法研究纯钛微结构变形行为，分析工艺参数对微流道成形质量的影响规律，为液压成形钛双极板提供参考。建立了TA2纯钛薄板微流道液压成形的有限元模型，通过与试验件的轮廓及厚度分布验证有限元模型的准确性；研究了液体压力、加载速率和脉动加载对微流道成形的影响。结果表明，微流道液压成形过程中材料应变路径为平面应变，且上圆角位置最容易破裂；加载速率对微流道成形影响不大，随着加载速率的提高，成形深度略有下降，但是变化不大，仅有3%；脉动加载路径能够提高材料的流动变形能力，在均为临界破裂情况下，相比较线性加载路径成形深度有较高的提高，可达232.2 μm，提高幅度为23%。

关键词: TA2, 微流道, 液压成形, 脉动加载

Abstract:

Bipolar plates are one of the important components of hydrogen fuel cells. Titanium has many advantages as a metal bipolar plate substrate， but titanium has poor forming properties and severe rebound. In this paper， taking the micro channel hydroforming process of 0.1 mm TA2 pure titanium sheet as the research object， the microstructure deformation behavior of pure titanium is studied through the combination of experiment and finite element simulation， and the influence of process parameters on the forming quality of micro flow channel is analyzed， so as to provide guidance for the hydroforming of titanium bipolar plate. A finite element model has been developed for micro flow channel hydroforming of TA2 pure titanium sheet， and the accuracy of the finite element model is verified with the contours and thickness distribution of the test pieces. The effect of fluid pressure， loading rate and pulsatile loading on micro flow channel forming has been studied. The results show that the strain path of material in the process of micro flow channel hydroforming is plane strain， and the upper rounded corner position is the easiest to rupture. The loading rate does not have a great influence on the micro flow channel forming， and the molding depth decreases slightly by 3% with the increase of the loading rate. The pulsating loading path can improve the flow deformation ability of the material. Under the condition of critical fracture， the forming depth has a high increase compared with the linear loading path， which is up to 232.2 μm， an increase of 23%.

Key words: TA2, micro flow channel, hydroforming, pulsatile loading

徐勇,高明宇,解文龙,张士宏,苏宗辉. TA2纯钛薄板微流道液压成形工艺研究[J]. 汽车工程, 2024, 46(8): 1511-1519.

Yong Xu,Mingyu Gao,Wenlong Xie,Shihong Zhang,Zonghui Su. Research on Micro Flow Channel Hydroforming Process of TA2 Pure Titanium Thin Plate[J]. Automotive Engineering, 2024, 46(8): 1511-1519.

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