TC4钛合金环壳件全流程电辅助拉深仿真模拟  

Simulation of Full-Process Electrically Assisted Deep Drawing of TC4 Alloy Ring Shell Parts

作　　者：刘少枫 虞仁海 刘蕾 严思梁 李萍[1] 薛克敏[1] LIU Shaofeng;YU Renhai;LIU Lei;YAN Siliang;LI Ping;XUE Keming(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《上海航天(中英文)》2024年第S2期111-117,共7页Aerospace Shanghai(Chinese&English)

基　　金：国家自然科学基金(U23B20100,52375330);上海航天科技创新基金(SAST2021-071)

摘　　要：为了揭示TC4钛合金环壳件电脉冲辅助拉深成形过程中温度场、应力应变场等的时空分布规律,建立了电辅助拉深成形的电-热-结构耦合有限元模型,研究拉深过程中不同电流参数对环壳件成形质量的影响。结果表明:拉深过程中TC4钛合金环壳在内、外缘侧壁中心区域分别产生较为显著的切向压应力和拉应力集中,成为失稳起皱敏感区域;电流密度通过改变板料拉深过程中的温度区间从而影响钛合金的流动阻力,电流密度越高、成形温度越高、流动阻力降低,回弹量和减薄率越低;不同的电流加载方式对板料拉深过程的影响较小,但纵向电流可在一定程度上降低减薄率。设计并加工了电辅助拉深模具工装,开展了环壳件电脉冲辅助加热拉深工艺试验,以验证拉深模具与电流施加方式的可行性。In order to reveal the spatial and temporal distribution control of temperature field and stress-strain field during the electric pulse-assisted deep-drawing forming process of TC4 titanium alloy ring shell parts,an electrothermo-mechanical coupling finite element model of electric-assisted deep-drawing forming was established to study the influence of current parameters on the forming quality of ring shell parts during deep-drawing process.The results show that during the deep-drawing process,significant tangential compressive stress and tangential tensile stress concentration were generated in the centre of the inner and outer sidewalls of TC4 titanium alloy ring shell parts,respectively,which become the sensitive area for instability and wrinkling.The current density affects the flow resistance of titanium alloy by changing the temperature range in the process of sheet deep-drawing,the higher the current density,the higher the forming temperature,the lower the flow resistance,the lower the amount of springback and the lower the thinning rate.Different current loading direction has less effect on the sheet deep drawing process,but the longitudinal current can reduce the thinning rate to some extent.The manufacturing system of electricallyassisted deep-drawing was designed and processed,and the test of electric pulse-assisted heating and deep-drawing process for ring shell parts was carried out to verify the feasibility of deep-drawing equipment and current application method.

关 键 词：环壳件 电脉冲辅助成形 拉深工艺 起皱控制 

分 类 号：TG301[金属学及工艺—金属压力加工]