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针对纯钛箔材在电加热辅助微拉深成形过程中温度分布和应力分布不均的问题，研究了电辅助加热时不同坯料结构和电极位置对微拉深成形的影响。设计了不同坯料结构与电极位置，采用有限元仿真对电加热辅助纯钛箔材微拉深时的温度分布及成形过程分别进行热电耦合与热力耦合动态显示分析，研究了电极位置及个数对坯料电流密度、温度、应力及应变分布的影响。结果表明，增加电极数目与均匀分布电极可以有效改善坯料电流密度与温度分布，均匀分布的温度场降低了微拉深成形时的等效应力，减小了凸模载荷并改善了材料的成形性能。采用6个电极且正负极间隔分布时，微拉深区域温度整体达到300℃,坯料中心与边缘的温度差从初始2个电极坯料的60℃降低为5℃左右，成形时凸凹模圆角处的应力下降约11.2%;凸模载荷降低约12.8%;筒底应变减小44.6%,且圆角处变形均匀性显著提高。
Abstract：Aiming at the problem of non-uniform temperature distribution and stress distribution in the process of resistance-heating-assisted micro deep drawing of pure titanium foils, the effects of different blank structures and electrode positions on resistance-heating-assisted micro deep drawing were studied. Different blank structures and electrode positions were designed, the temperature distribution and forming process during resistance-heating-assisted micro deep drawing for pure titanium foil were analyzed by coupled thermal-electrical procedure and coupled thermal-force dynamic explicit procedure using finite element simulation, the effects of electrode position and number on the current density, temperature, stress and strain distribution of the blank were analyzed. The results show that increasing the number of electrodes and distributing electrodes uniformly can effectively improve the distribution of current density and temperature, uniform temperature field reduces the equivalent stress during micro deep drawing, reduces the punch load and improves the formability of the material. When 6 electrodes are adopted and the positive and negative electrodes are distributed at intervals, the temperature of the micro deep drawing area reaches 300 ℃ overall. In addition, compared to the temperature difference of 60 ℃ between the center and the edge in the original blank with 2 electrodes, it is reduced to approximately 5 ℃;the stress at the fillet of punch and die decreases by approximately 11.2%, while the punch load decreases by 12.8%, the strain at the bottom of the cylinder decreases by 44.6%,and the deformation uniformity at the fillet is significantly improved.
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基本信息:
中图分类号:TG389;TP391.9
引用信息:
[1]狄屹杨,郑秋,胡逸凡,等.基于温度场优化的电加热辅助纯钛箔微拉深成形仿真分析[J].塑性工程学报,2026,33(05):13-20.
基金信息:
国家自然科学基金资助项目(52105363); 华中科技大学材料成形与模具技术全国重点实验室开放课题(P2023-019); 中央高校基本科研业务费专项基金资助项目(NJ2024019)
2026-05-21
2026-05-21
2026-05-21