钛合金TC4室温下电磁胀形的工艺分析  

Experimental and numerical analysis of electromagnetic bulging process of Titanium alloy TC4 under room temperature

作　　者：周海洋[1] 莫健华[1] 李建军[1] 李奋强 黄亮[1] 李娜[1] 邱立[2] 

机构地区：[1]华中科技大学材料成形及模具技术国家重点实验室,武汉430074 [2]华中科技大学国家脉冲强磁场科学中心,武汉430074

出　　处：《塑性工程学报》2013年第3期76-81,共6页Journal of Plasticity Engineering

基　　金：国家973计划资助项目(2011CB012802);国家自然科学基金资助项目(51175201)

摘　　要：电磁成形作为一种高速率成形技术,可以提高室温下难成形材料的成形性能,有待尝试应用于室温下钛合金工件的成形工艺。采用数值仿真与实验结合的方法,对高强度、低导电性材料钛合金TC4的室温下电磁驱动胀形过程进行研究,所用驱动片为0.8mm厚的T3紫铜板。通过分析,得到了成形过程中驱动片上的电磁力分布,工件上应变率、变形速度的分布,驱动片与工件之间冲击力随时间的变化。研究结果表明,数值仿真得到的工件变形及厚度分布与实验数据基本吻合,数值仿真结果可靠。驱动片与工件之间的冲击力大于直接作用的电磁力,同时工件的变形滞后于铜驱动片与工件碰撞产生的冲击波传递。可为钛合金电磁成形工艺设计提供指导。As a kind of high velocity forming process, electromagnetic forming can improve the formability of materials under room temperature. The electromagnetic drive bulging at room temperature of highstrength, low conductivity material titanium al- loy TC4 using T3 copper driver plates was studied by numerical simulation and experimental method. By analyzing the deforma- tion process, the distribution of electromagnetic force on drive plate, the impact force between driver plate and workpiece varied with time, the distribution of deformation speed and strain rate on the workpiece during forming process were obtained. Results show that the numerical prediction of the deformation and thickness distribution is fit to the experiment data. The impact force between drive plate and sheet metal is bigger than the directly electromagnetic force and the deformation of TC4 sheet is lag to the shock wave transmission caused by the impact between cooper drive plate and workpiece.

关 键 词：钛合金TC4 电磁胀形 数值仿真 高应变率 

分 类 号：TG391[金属学及工艺—金属压力加工]